CN105006396A - A switch module of an ultra-thin reflective computer input device - Google Patents

Abstract

The present invention relates to a switch module of an ultra-thin reflective computer input device, and more particularly, to a key switch of a computer input keyboard and a key switch of a computer mouse. The light emitting device and the light receiving device form a light path channel through at least one reflecting surface, the reflecting surface is integrated on a key shaft, a key cap or a fixed shell, and when a key is pressed down or loosened, the light path is switched on or switched off by moving up and down of part of the reflecting surface, so that the on and off of a circuit connected with the light receiving device are triggered. The invention also discloses a key cap character lighting system, comprising: a single-color LED or multi-color LED lighting source arranged on the PCB board and an optical device for light distribution positioned on the upper fixed shell. The input equipment switch module has the characteristics of simple structure, low cost, convenience in assembly, low height of the switch module and the like, and the height of the switch module is only 1/3-1/4 of the traditional mechanical shaft keyboard.

Description

A switch module of an ultra-thin reflective computer input device

technical field

The invention relates to the technical field of electronic device input equipment, in particular to a switch module of an ultra-thin reflective computer input equipment.

Background technique

The mechanical keyboard is the mainstream of the computer keyboard market at present. Its switch principle is as follows: when the key is pressed and released, the metal contact on the mechanical key shaft and the metal shrapnel fixed on the shell perform contact and non-contact actions to realize The conduction and disconnection of the circuit, this mechanical contact structure is prone to fatigue damage, and the shrapnel and contacts are easy to wear, resulting in switch control failure or misoperation control, and the product life is not long enough; second, metal shrapnel and contacts It is easy to be affected by the use environment to cause oxidation and aging, resulting in poor conduction and contact, resulting in switch control failure or malfunction control. In addition, the key height of the mechanical axis keyboard is relatively high. When the key is released and the spring springs up, the height from the top of the keycap to the PCB (printed circuit board) below is 16mm-19mm, and the height when the key is pressed to the bottom is also 12mm- 15mm.

Photoelectric keyboard is an emerging technology at present. The main method in the current technology is to retain the basic structure of the traditional mechanical keyboard switch module, including key shafts, springs, and upper and lower shells. The metal contacts and shrapnel of the group are replaced with optical switching devices, and a light emitting device and a light receiving device (photosensitive element) are added at the same time. When the button is pressed or lifted, the optical switch device is turned on or cut off, thereby triggering the on and off of the circuit connected to the light receiving device. The advantages of the photoelectric keyboard are: precise control, faster switching action, high sensitivity, better feel, not affected by contact wear and oxidation aging, long service life, and can meet high-frequency and long-term applications; and There is no vibration problem of mechanical contact, zero noise, zero delay of switching action time, more sensitive, fast and precise operation. However, since the existing technology of the photoelectric keyboard is inherited from the original traditional mechanical keyboard switch module, its key height is relatively high and the volume is relatively large, which is more suitable for desktop input devices and is not suitable for integration into notebook computers and small portable digital devices. on the device.

Contents of the invention

The first object of the present invention is to overcome the shortcomings and deficiencies of the prior art, and provide an ultra-thin reflective switch module for computer input devices.

Another object of the present invention is to provide a key cap character lighting system for use with a switch module of an ultra-thin reflective computer input device.

First purpose of the present invention is achieved through the following technical solutions:

A switch module of an ultra-thin reflective computer input device, comprising a keycap, a key shaft, a spring, an upper fixed case, a lower fixed case, and a PCB board, and the ultra-thin reflective photoelectric keyboard switch module also includes A light-emitting device and a light-receiving device, an optical path channel is formed between the light-emitting device and the light-receiving device through at least one reflective surface, and the reflective surface is integrated on the keycap, the key shaft, the upper fixed shell or the lower fixed shell , when the button is pressed or released, the up and down movement of part of the reflective surface makes the light path be turned on or off, thereby triggering the on and off of the circuit connected to the light receiving device.

Further, the light-emitting device and the light-receiving device are both arranged on the PCB board, the lower fixing shell is provided with a first through hole and a second through hole, and the first through hole is located on the Above the light-emitting device, the second through hole is located above the light-receiving device.

Further, the optical path channel includes a second reflective surface located below the key shaft, and a first reflective surface and a third reflective surface located below the upper fixed housing,

The light emitted from the light-emitting device is incident on the first reflective surface below the upper fixed shell after passing through the first through hole on the lower fixed shell. When the key is pressed down, the second reflective surface on the key shaft just faces the The first reflective surface located below the upper fixed shell reflects the collimated light incident from the first reflective surface, and the reflected light is incident on the third reflective surface on the other side below the upper fixed shell above, the third reflective surface converges the incident light to the light receiving device on the PCB board through the second through hole of the lower fixed shell, thereby triggering the conduction of the circuit;

When the key release spring returns to its original position, the key shaft and the first reflective surface move upward together, the second reflective surface on the key shaft is staggered from the first reflective surface below the upper fixed shell, and the optical path is cut off and connected circuit is disconnected.

Further, the first reflective surface located under the upper fixed shell is an off-axis parabola, an off-axis quadratic surface, or a free-form surface of a polynomial surface, which can also be a pure plane or a composite surface composed of multiple surfaces; The third reflective surface located on the other side below the upper fixed shell is an off-axis paraboloid, an off-axis quadratic surface or a free-form surface of a polynomial surface. It can also be an inclined pure plane composed of multiple surfaces. A compound curved surface; the first reflective surface is optically coupled with the third reflective surface through the reflection of the second reflective surface.

Further, the first reflective surface, the second reflective surface and the third reflective surface are arranged symmetrically with respect to the center of the key axis, or may be asymmetrically arranged.

Further, the optical path channel includes a fifth reflective surface and a sixth reflective surface located below the key shaft, and a fourth reflective surface and a seventh reflective surface located below the upper fixed housing,

The light emitted from the light-emitting device is incident on the fourth reflective surface below the upper fixed shell after passing through the first through hole on the lower fixed shell. When the button is pressed down, the fifth reflective surface on the key shaft is just opposite to The fourth reflective surface located below the upper fixed shell reflects the collimated light incident from the fourth reflective surface, and the reflected light is incident on the sixth reflective surface also located on the other side of the key shaft. On the reflective surface, after being reflected again, the reflected light is incident on the seventh reflective surface under the upper fixed shell, and the seventh reflective surface converges the incident light through the second through hole of the lower fixed shell to the second through hole on the PCB board. The light-receiving device, thus triggering the circuit conduction;

When the key release spring returns to its original position, the key shaft moves upward, and the key shaft and the fifth and sixth reflective surfaces move upward together. The fifth reflective surface on the key shaft and the fourth reflective surface located under the upper fixed shell The reflective surfaces are staggered, and at the same time, the sixth reflective surface on the key shaft is staggered from the seventh reflective surface below the upper fixed shell, the optical path is cut off, and the connected circuit is in a disconnected state.

Further, the fourth reflective surface located under the upper fixed shell is an off-axis paraboloid, an off-axis quadratic surface, or a free-form surface of a polynomial surface, which can also be a pure plane or a compound surface composed of multiple surfaces. The seventh reflective surface located on the other side below the upper fixed shell, its reflective surface is an off-axis paraboloid, an off-axis quadratic surface, or a free-form surface of a polynomial surface, which can also be an inclined pure plane, or a plurality of surfaces composed of composite surfaces. The fourth reflective surface is optically coupled with the seventh reflective surface through the reflection of the fifth reflective surface and the sixth reflective surface.

Further, the fourth reflective surface, the fifth reflective surface, the sixth reflective surface, and the seventh reflective surface are arranged symmetrically with respect to the center of the key axis, or may be asymmetrically arranged.

Further, the optical path channel includes the ninth reflective surface and the tenth reflective surface located below the key shaft, the eighth reflective surface and the eleventh reflective surface located below the upper fixed housing, and the first through hole located in the lower fixed housing position of the collimator lens or/and the focusing lens of the second through hole position,

The light emitted from the light-emitting device is incident on the eighth reflective surface below the upper fixed housing after passing through the collimating lens at the position of the first through hole on the lower fixed housing. The reflective surface is just aligned with the eighth reflective surface located under the upper fixed shell, which reflects the collimated light incident from the eighth reflective surface, and the reflected light is incident on the other side also located on the key shaft. The tenth reflective surface is reflected again, and the reflected light is incident on another eleventh reflective surface below the upper fixed shell, and the eleventh reflective surface passes the incident light through the second channel on the lower fixed shell. The focusing lens at the hole position converges to the light-receiving device on the PCB board, thereby triggering the conduction of the circuit;

When the key release spring returns to its original position, the key shaft moves upward, and the key shaft and the ninth and tenth reflective surfaces move upward together. The ninth reflective surface on the key shaft and the eighth reflective surface below the upper fixed shell The reflective surfaces are staggered, and at the same time, the tenth reflective surface on the key shaft is staggered from the eleventh reflective surface below the upper fixed shell, the optical path is cut off, and the connected circuit is in a disconnected state.

Further, the eighth reflective surface located under the upper fixed shell is a plane inclined at 45 degrees, and can also be an off-axis paraboloid, an off-axis quadratic surface or a free-form surface of a polynomial surface, or it can be a free-form surface composed of multiple surfaces composed of composite surfaces;

The eleventh reflective surface located on the other side below the upper fixed shell, its reflective surface is a plane inclined at 45 degrees, and can also be an off-axis paraboloid, an off-axis quadratic surface or a free-form surface of a polynomial surface, which can also be is a composite surface composed of multiple faces;

The eighth reflective surface is optically coupled with the eleventh reflective surface through reflections from the ninth reflective surface and the tenth reflective surface.

Further, the eighth reflective surface, the ninth reflective surface, the tenth reflective surface, and the eleventh reflective surface are arranged symmetrically with respect to the center of the key axis, or may be asymmetrically arranged.

Further, the optical path channel includes a twelfth reflective surface located under the keycap and a thirteenth reflective surface located on the upper fixed shell,

The light emitted from the light-emitting device is incident on the twelfth reflective surface under the key cap after passing through the position of the first through hole on the lower fixed shell. When the key is pressed down, the twelfth reflective surface under the key cap is Align with the thirteenth reflective surface of the upper fixed shell, which collimates or partially collimates the incident light from the twelfth reflective surface, and the emitted light passes through the thirteenth reflective surface to the Turning down and converging, the converged light is concentrated to the light receiving device of the PCB board through the second through hole on the lower fixed shell, thereby triggering the circuit conduction;

When the key release spring returns to the original position, the twelfth reflective surface located under the key cap is completely staggered from the thirteenth reflective surface located on the upper fixed shell, the optical path is cut off, and the connected circuit is disconnected.

Further, the twelfth reflective surface located under the keycap and the thirteenth reflective surface located on the upper fixed shell are both off-axis paraboloids, off-axis quadratic surfaces or free-form surfaces of polynomial surfaces, which can also be inclined pure plane, or a compound surface composed of multiple faces.

Further, the optical path channel includes a collimator lens located at the position of the first through hole of the lower fixed shell, a fourteenth reflective surface located under the keycap, and a fifteenth reflective surface of a free-form surface located on the upper fixed shell,

The light emitted from the light-emitting device is collimated and incident on the fourteenth reflective surface under the keycap after passing through the collimating lens at the position of the first through hole on the lower fixed shell. The fourteenth reflective surface is just aligned with the fifteenth reflective surface of the upper fixed shell, which collimates the incident light from the fourteenth reflective surface, and the emitted light passes through the fifteenth reflective surface The face turns and converges downwards, and the converged light is concentrated to the light receiving device of the PCB board through the second through hole on the lower fixed shell, thereby triggering the conduction of the circuit;

When the key release spring returns to the original position, the fourteenth reflective surface located under the key cap is completely staggered from the fifteenth reflective surface located on the upper fixed shell, the optical path is cut off, and the connected circuit is disconnected.

Further, the fourteenth reflective surface located under the keycap is an inclined plane, and the fifteenth reflective surface located on the upper fixed shell is an off-axis paraboloid, an off-axis quadratic surface or a free-form polynomial surface, which It can also be an inclined pure plane, or a compound surface composed of multiple faces.

Further, the optical path channel includes a collimating lens located at the position of the first through hole of the lower fixed shell, a sixteenth reflective surface located under the keycap, a seventeenth reflective mirror located at the upper fixed shell, and a 16th reflecting surface located at the lower fixed shell. Condenser lens at the position of two through holes,

The light emitted from the light-emitting device is collimated and incident on the sixteenth reflective surface under the keycap after passing through the collimating lens at the position of the first through hole on the lower fixed shell. The sixteenth reflective surface is just aligned with the seventeenth reflective surface of the upper fixed shell, which collimates the incident light from the sixteenth reflective surface, and the emitted light passes through the seventeenth reflection The surface is turned downward, and then converged by the Fresnel condenser lens at the second through hole position of the lower fixed shell, and then concentrated to the light receiving device of the PCB board, thereby triggering the conduction of the circuit;

When the key release spring returns to the original position, the sixteenth reflective surface located under the keycap is completely staggered from the seventeenth reflective surface located on the upper fixed shell, the optical path is cut off, and the connected circuit is disconnected.

Further, the fourteenth reflective surface located under the keycap and the seventeenth reflective surface located on the upper fixed shell are inclined planes, which may also be off-axis paraboloids, off-axis quadratic surfaces or polynomial curved surfaces. A free-form surface, or a compound surface composed of multiple faces.

Further, the optical path channel includes an eighteenth reflective surface located under the keycap, and a first refracting prism located at the second through hole of the lower fixed shell,

The light emitted from the light-emitting device is collimated and incident on the eighteenth reflective surface under the keycap after passing through the first through hole on the lower fixed shell. When the key is pressed down, the eighteenth reflection surface under the keycap will The surface is just aligned with the first refracting prism located at the second through hole of the lower fixed shell, which collimates or partially collimates the light emitted from the light-emitting device and then refracts it before emitting it, and the emitted light passes through the first refraction prism The prism performs total reflection and convergence, and turns downward, and the refracted light is projected to the light receiving device of the PCB board, thereby triggering the conduction of the circuit;

When the key release spring returns to its original position, the eighteenth reflective surface located under the keycap is completely staggered from the first refracting prism located at the second through hole of the lower fixed shell, the optical path is cut off, and the connected circuit is disconnected.

Further, the eighteenth reflective surface located under the keycap is an off-axis paraboloid, an off-axis quadratic surface, or a free-form surface of a polynomial surface, which can also be an inclined pure plane, or a composite surface composed of multiple surfaces;

The first refracting prism located at the position of the second through hole of the lower fixed shell has a vertical plane near the eighteenth reflective surface, which is the input surface; and an inclined free-form surface on the side away from the eighteenth reflective surface The total reflection surface can be an off-axis paraboloid, an off-axis quadratic surface, or a polynomial surface, it can also be an inclined pure plane, or a composite surface composed of multiple surfaces; there is a horizontal light-transmitting plane below it, which is output face.

Further, the light path channel includes a first light blocking sheet located under the keycap, a second refracting prism located at the position of the first through hole of the lower fixed shell, and a third refracting prism located at the position of the second through hole of the lower fixed shell , the second and third refracting prisms have reflective curved surfaces for light refraction;

The second refracting prism and the third refracting prism are aligned with each other. When the button is released, the light emitted by the light-emitting device passes through the Fresnel surface below the second refracting prism, and then collimates and enters the said third refracting prism. The inclined total reflection surface above the second refraction prism is output from the vertical plane on the right side of the second refraction prism after being deflected by the total reflection surface, and the output light is incident on the third refraction prism on the other side, and passes through the second refraction prism. After the inclined total reflection surface above it is turned, it converges to the light-receiving device of the PCB board through the Fresnel surface below it, thereby triggering the conduction of the circuit;

When the button is pressed down, the first light-blocking sheet located under the keycap moves downward, which completely blocks the light between the second refracting prism and the third refracting prism, the light path is cut off, and the connected circuit is in Disconnected state.

Further, above the second refracting prism and the third refracting prism is an off-axis paraboloid, an off-axis quadratic surface or a free-form surface of a polynomial surface, which can also be an inclined pure plane, or a plurality of surfaces The composite surface of which is a Fresnel surface below it.

Further, the light path channel includes a second light blocking sheet located under the keycap, a nineteenth reflective surface located on the upper fixed shell, and a twentieth reflective surface also located on the upper fixed shell,

The nineteenth reflective surface and the twentieth reflective surface are aligned with each other, and when the button is released, the light emitted by the light-emitting device passes through the nineteenth reflection on the upper fixed shell for collimating and turning the light path After surface reflection, the collimated emitted light turns downward through the twentieth reflective surface, and then converges on the light-receiving device of the PCB board through the second through hole of the lower fixed shell, thereby triggering the conduction of the circuit; when the button is pressed When pressing, the second light-blocking sheet located under the keycap moves downwards, which completely blocks the light between the nineteenth reflective surface and the twentieth reflective surface, the light path is cut off, and the connected circuit is in disconnection. open state.

Further, the nineteenth reflective surface and the twentieth reflective surface are off-axis paraboloids, off-axis quadratic surfaces or free-form surfaces of polynomial surfaces, which can also be inclined pure planes, or composed of multiple surfaces Composite surfaces.

Further, the light path channel includes a third light blocking sheet located under the keycap, a fourth refracting prism located at the position of the first through hole of the lower fixed shell for turning the light path, and a fourth refracting prism located on the upper fixed shell for turning the light path. twenty-first reflective surface,

The fourth refracting prism is aligned with the twenty-first reflective surface, when the button is released, the light emitted by the light emitting device is reflected by the total reflection surface of the fourth refracting prism, and the emitted light is refracted Then turn down through the twenty-first reflective surface, and then converge on the light receiving device of the PCB board through the second through hole of the lower fixed shell, thereby triggering the circuit to be turned on;

When the key is pressed down, the third light-blocking sheet located under the keycap moves downward, which completely blocks the light between the fourth refracting prism and the twenty-first reflective surface, the light path is cut off, and the connected The circuit is open.

Further, the top of the third refracting prism is a total reflection surface in the form of an inclined curved surface, which is an off-axis paraboloid, off-axis quadratic surface, or polynomial curved surface, which can also be an inclined pure plane, or a plurality of surfaces Composite surfaces composed of Fresnel surfaces below them;

The twenty-first reflective surface is an off-axis paraboloid, an off-axis quadratic surface, or a free-form surface of a polynomial surface, and it can also be an inclined pure plane, or a compound curved surface composed of multiple surfaces.

Further, the optical path channel includes a fourth light-blocking sheet located under the keycap, a fifth refracting prism located at the position of the first through hole on the lower fixed shell for collimating and deflecting the optical path, and a fifth refractive prism also located on the lower fixed shell The sixth refracting prism used to bend the light path at the position of the second through hole,

The fifth refracting prism and the sixth refracting prism are aligned with each other. When the button is released, the light emitted by the light emitting device is reflected by the total reflection surface of the fifth refracting prism, and the collimated emitted light is again Reflecting and turning downwards through the total reflection surface of the sixth refracting prism, converging on the light receiving device of the PCB board, thereby triggering the conduction of the circuit;

When the button is pressed down, the fourth light-blocking sheet located below the keycap moves downward, which completely blocks the light between the fifth refracting prism and the sixth refracting prism, the light path is cut off, and the connected circuit is in Disconnected state.

Further, above the fifth and sixth refracting prisms are total reflection surfaces in the form of inclined curved surfaces, which are off-axis paraboloids, off-axis quadratic surfaces, or polynomial curved surfaces, which can also be inclined pure planes, or A compound curved surface composed of multiple surfaces; the bottom of the fifth and sixth refracting prisms are all Fresnel surfaces.

Further, the optical path channel includes the twenty-second reflective surface and the twenty-third reflective surface located under the keycap, a collimating Fresnel lens located at the position of the first through hole of the lower fixed shell, The concentrating Fresnel lens on the position of the second through hole, and the fifth light blocking sheet on the PCB board,

The twenty-second reflective surface and the twenty-third reflective surface are aligned with each other. When the key is released, the light emitted by the light-emitting device is collimated by the collimating Fresnel lens on the lower fixed shell. Incident to the twenty-second reflective surface located under the keycap, after reflection, the light is turned, and then incident on the other side, the twenty-third reflective surface also located under the keycap, after being reflected again, The light is incident downward into the concentrating Fresnel lens located in the lower fixed shell, and converges on the light receiving device of the PCB board, thereby triggering the conduction of the circuit;

When the button is pressed down, the fifth light-blocking sheet located on the PCB completely blocks the light between the twenty-second reflective surface and the twenty-third reflective surface, the light path is cut off, and the connected circuit is disconnected. open state.

Further, the twenty-second reflective surface and the twenty-third reflective surface are both inclined planes, which can also be off-axis paraboloids, off-axis quadratic surfaces or free-form surfaces of polynomial surfaces, or composed of multiple surfaces Composite surfaces.

Further, the optical path channel includes a first rectangular prism and a second rectangular prism located under the keycap, a collimating Fresnel lens located at the position of the first through hole of the lower fixed shell, and a collimating Fresnel lens located at the position of the second through hole of the lower fixed shell. The concentrating Fresnel lens on the top, and the sixth light blocking sheet on the PCB board,

The first right-angle prism and the second right-angle prism are aligned with each other. When the key is released, the light emitted by the light-emitting device is collimated by the collimating Fresnel lens on the lower fixed shell, and then incident on the button located on the key. The first right-angle prism under the cap, after being reflected by the reflective surface above it, the light turns and enters the second right-angle prism on the other side, which is also located under the keycap, and after being reflected again by the reflective surface above it, The light is incident downward into the concentrating Fresnel lens located in the lower fixed shell, and converges on the light receiving device of the PCB board, thereby triggering the conduction of the circuit;

When the button is pressed down, the sixth light blocking sheet located on the PCB completely blocks the light between the first right-angle prism and the second right-angle prism, the light path is cut off, and the connected circuit is in a disconnected state.

Further, the reflective surfaces above the first right-angle prism and the second right-angle prism are total reflection surfaces, and are all inclined planes, which can also be off-axis paraboloids, off-axis quadratic surfaces or polynomial curved surfaces. surface, or a composite surface composed of multiple faces.

Further, the optical path channel includes the twenty-fourth reflective surface and the twenty-fifth reflective surface located under the keycap, and the seventh light blocking sheet located on the PCB board,

The twenty-fourth reflective surface and the twenty-fifth reflective surface are aligned with each other. When the key is released, the light emitted by the light-emitting device enters the keycap below the keycap through the first through hole on the lower fixed shell. The said twenty-fourth reflective surface, after being reflected, the light is projected to the other side, the twenty-fifth reflective surface which is also located under the keycap, and after being reflected again, the light turns downward and passes through the lower fixed shell The second through hole on the PCB converges to the light-receiving device on the PCB board, thereby triggering the conduction of the circuit;

When the button is pressed down, the seventh light-blocking sheet located on the PCB completely blocks the light between the twenty-fourth reflective surface and the twenty-fifth reflective surface, the light path is cut off, and the connected circuit is disconnected. open state.

Further, the twenty-fourth reflective surface and the twenty-fifth reflective surface are both off-axis paraboloids, off-axis quadratic surfaces, or free-form surfaces of polynomial surfaces, which can also be inclined pure planes, or multiple Composite surfaces composed of faces.

Further, the light-emitting device is vertically arranged on the upper fixed shell, the light-receiving device is arranged on the PCB board, the lower fixed shell is provided with a second through hole, and the second A through hole is located above the light receiving device.

Further, the optical path channel includes a collimating Fresnel lens arranged on the upper fixed shell, a twenty-sixth reflective surface located on the key shaft, and a twenty-seventh reflective surface located under the upper fixed shell,

The light emitted from the light-emitting device is collimated and incident on the twenty-sixth reflective surface of the key shaft after passing through the collimating Fresnel lens on the upper fixed shell. The twenty-sixth reflective surface is just aligned with the twenty-seventh reflective surface under the upper fixed shell, which turns and refracts the incident light from the twenty-sixth reflective surface, and the emitted light passes through the second fixed shell. The back of the through hole position is concentrated to the light receiving device of the PCB board, thereby triggering the conduction of the circuit;

When the button is released and the spring returns to the original position, the twenty-sixth reflective surface is completely staggered from the twenty-seventh reflective surface, the optical path is cut off, and the connected circuit is in a disconnected state.

Further, the twenty-seventh reflective surface is an off-axis paraboloid, an off-axis quadratic surface, or a free-form polynomial surface, which can also be an inclined pure plane, or a compound curved surface composed of multiple surfaces.

Further, the optical path channel includes a collimating Fresnel lens arranged on the upper fixed case, an eighth light blocking sheet located under the keycap, and a seventh refracting prism located at the position of the second through hole of the lower fixed case,

The collimating Fresnel lens and the seventh refracting prism arranged on the upper fixed shell are aligned with each other, and when the button is released, the light emitted by the light-emitting device is collimated and emitted through the collimating Fresnel lens , the light is incident on the seventh refracting prism at the position of the second through hole of the lower fixed shell on the other side, after being refracted by the inclined total reflection surface above it, it passes through the condensing phenanthrene below the seventh refracting prism The Neel plane converges to the light-receiving device of the PCB board, thereby triggering the conduction of the circuit;

When the button is pressed down, the eighth light blocking sheet located under the keycap completely blocks the light between the collimating Fresnel lens and the seventh refracting prism, the light path is cut off, and the connected circuit is in a disconnected state .

Further, above the seventh refracting prism is an inclined reflective surface, which is an off-axis paraboloid, an off-axis quadric surface, or a free-form surface in the form of a polynomial surface, which can also be an inclined pure plane, or A compound curved surface composed of a plurality of surfaces, and the light concentrating Fresnel surface is located below the seventh refracting prism.

Further, the optical path channel includes a collimating Fresnel lens arranged on the upper fixed case, a ninth light blocking sheet located under the keycap, and a twenty-eighth reflective surface located on the upper fixed case,

The collimating Fresnel lens and the twenty-eighth reflective surface arranged on the upper fixed shell are aligned with each other. Directly emitted, the light is incident on the twenty-eighth reflective surface located on the upper fixed shell on the other side, after being reflected and turned, it converges on the light receiving device of the PCB board through the second through hole located on the lower fixed shell, thereby The trigger circuit is turned on;

When the button is pressed down, the ninth light blocking sheet located under the keycap completely blocks the light between the collimating Fresnel lens and the twenty-eighth reflective surface, the light path is cut off, and the connected circuit is in an off state. open state.

Further, the twenty-eighth reflective surface is an off-axis paraboloid, an off-axis quadratic surface, or a free-form polynomial surface, which can also be an inclined pure plane, or a compound curved surface composed of multiple surfaces.

Further, the optical path channel includes a collimating Fresnel lens arranged on the upper fixed case, a tenth light blocking sheet located under the keycap, and an eighth refracting prism located at the position of the second through hole of the lower fixed case,

The collimating Fresnel lens and the eighth refracting prism arranged on the upper fixed shell are aligned with each other. When the button is released, the light emitted by the light emitting device is collimated and emitted through the collimating Fresnel lens. , the light is incident on the eighth refracting prism on the other side at the position of the second through hole of the lower fixed shell, after being turned by the inclined total reflection surface above it, and then converged to the PCB board through the light-transmitting plane below it on the light receiving device, thereby triggering the circuit conduction;

When the key is pressed down, the tenth light blocking sheet located under the keycap completely blocks the light between the collimating Fresnel lens and the eighth refracting prism, the light path is cut off, and the connected circuit is in a disconnected state .

Further, above the eighth refracting prism is an inclined reflective surface, which is an off-axis paraboloid, an off-axis quadric surface, or a free-form surface in the form of a polynomial surface, which can also be an inclined pure plane, or A compound curved surface composed of multiple surfaces, the light-transmitting plane is below the eighth refracting prism.

Further, the light receiving device is vertically arranged on the upper fixed shell, the light emitting device is arranged on the PCB board, the lower fixed shell is provided with a first through hole, and the first A through hole is located above the light emitting device.

Further, the optical path channel includes the twenty-ninth reflective surface arranged under the upper fixed shell, the thirtieth reflective surface on the key shaft, the thirty-first reflective surface on the other side of the key shaft, and the Concentrating Fresnel lens on fixed shell,

The light emitted from the light-emitting device is collimated and incident on the twenty-ninth reflective surface below the upper fixed shell after passing through the first through hole on the lower fixed shell. When the key is pressed down, the first through hole on the key shaft The thirtieth reflective surface is just aligned with the twenty-ninth reflective surface below the upper fixed shell, and it turns and refracts the incident light from the twenty-ninth reflective surface, and then enters another light that is also located on the key shaft. The thirty-first reflective surface on one side, after being reflected and turned again, is incident on the light-condensing Fresnel lens located on the other side of the upper fixed shell and then concentrated to the light receiving device of the upper fixed shell, thereby triggering the circuit conductor Pass;

When the button is released and the spring returns to its original position, the 30th reflective surface is completely staggered from the 29th reflective surface, and the 31st reflective surface is also completely staggered from the condensing Fresnel lens , the optical path is cut off, and the connected circuit is disconnected.

Further, the twenty-ninth reflective surface is an off-axis paraboloid, an off-axis quadratic surface, or a free-form surface in the form of a polynomial surface, which may also be an inclined pure plane, or a compound curved surface composed of multiple surfaces.

Further, the light path channel includes the eleventh light-blocking sheet located under the keycap, the ninth refracting prism on the lower fixed shell, and the other side of the eleventh light-blocking sheet on the upper Concentrating Fresnel lens on fixed housing,

The ninth refracting prism is aligned with the condensing Fresnel lens arranged on the upper fixed shell, and when the button is released, the light emitted from the light emitting device is aligned after passing through the first through hole on the lower fixed shell. It is directly incident on the ninth refracting prism, and after being collimated and deflected, it is incident on the other side and is located in the concentrating Fresnel lens of the upper fixed shell, and then converges to the light receiving device of the upper fixed shell, thereby The trigger circuit is turned on;

When the button is pressed down, the eleventh light-blocking sheet located under the keycap completely blocks the light between the collimating Fresnel lens and the ninth refracting prism, the light path is cut off, and the connected circuit is in Disconnected state.

Further, above the ninth refracting prism is an inclined reflective surface, which is an off-axis paraboloid, an off-axis quadric surface, or a free-form surface in the form of a polynomial surface, which can also be an inclined pure plane, or A compound curved surface composed of multiple surfaces, the light-transmitting plane is below the ninth refracting prism.

Further, the light-receiving device is vertically arranged on the keycap, the light-emitting device is arranged on the PCB board, the lower fixing shell is provided with a first through hole, and the first through hole A hole is located above the light receiving device.

Further, the optical path channel includes a collimating Fresnel lens located at the position of the first through hole of the lower fixed shell, a twelfth light blocking sheet fixed on the PCB, fixed under the keycap and respectively located at the Describe the 32nd reflective surface on both sides of the 12th light blocking sheet and the concentrating Fresnel lens,

The thirty-second reflective surface is aligned with the condensing Fresnel lens fixed below the key cap, and when the key is released, the light emitted from the light-emitting device passes through the position of the first through hole of the lower fixed shell The collimated Fresnel lens is collimated and incident on the thirty-second reflective surface, after being deflected, it is incident on the other side of the concentrating Fresnel lens fixed under the keycap, and then converges To the light-receiving device that is also fixed under the keycap, so as to trigger the conduction of the circuit;

When the button is pressed down, the twelfth light-blocking sheet fixed on the PCB completely blocks the light between the condensing Fresnel lens and the thirty-second reflective surface, and the light path is cut off and connected circuit is disconnected.

Further, the condensing Fresnel lens and the light-receiving device are fixed under the keycap by buckling.

Further, the thirty-second reflective surface is an inclined plane.

Further, the optical path channel includes a collimating Fresnel lens located at the position of the first through hole of the lower fixed shell, a thirteenth light-blocking sheet fixed on the PCB, fixed under the keycap and respectively located at the Describe the third right-angle prism on both sides of the twelfth light-blocking sheet and the converging Fresnel lens,

The third right-angle prism is aligned with the condensing Fresnel lens fixed below the keycap, and when the key is released, the light emitted from the light-emitting device passes through the collimator at the position of the first through hole of the lower fixed shell. After the straight Fresnel lens is collimated and incident on the third right-angle prism, after being emitted and deflected by the reflective surface of its inclined plane, it is incident on the other side of the concentrating Fresnel lens fixed under the keycap, Then converge to the light-receiving device that is also fixed under the keycap, thereby triggering the conduction of the circuit;

When the button is pressed down, the thirteenth light-blocking sheet fixed on the PCB completely blocks the light between the condensing Fresnel lens and the third right-angle prism, the light path is cut off, and the connected circuit is disconnected.

Further, the condensing Fresnel lens, the light receiving device and the third right-angle prism are all fixed under the keycap by buckling.

Further, the upper part of the third rectangular prism is a reflective surface of an inclined plane.

Further, the reflective surface is a high-reflectance surface with a reflectance of more than 80%, which is bright silver or bright gold, and can also be a high-reflectance white or light-reflective coating.

Further, the light emitting device is an SMD IR infrared diode or a laser diode, and the light receiving device is an SMD PT tube.

Further, the light-blocking sheet is made of a black light-absorbing material, which is injection-molded with the keycap by two-color injection molding or combined by snap-fitting, or arranged above the PCB board by snap-fitting .

Another object of the present invention is achieved through the following technical solutions:

A key cap character lighting system, which is used in conjunction with a switch module of an ultra-thin reflective computer input device, the key cap character lighting system includes: a lighting source arranged on the PCB board and a fixed The optical device used for light distribution on the shell, wherein the illumination source is a single-color LED chip or a multi-color LED chip, and the optical device is a trapezoidal reflector, a square reflector, a polarizing lens, a total reflection lens, a combined lens or Diffusion sheet with internal doping diffusion particles for light mixing treatment.

Preferably, the optical device is a trapezoidal reflector or a square reflector, which distributes the light emitted by the illumination source to the required illumination range, and its reflective surface is a high reflectivity surface, and its reflectance More than 80%, it is bright silver or bright gold, and it can also be high reflectivity white or light reflective coating.

Preferably, the optical device is an eccentric lens, and its upper curved surface is an eccentric, asymmetric free-form surface.

Preferably, the optical device is a total reflection lens, which includes a central refraction portion and an outer total reflection portion.

Preferably, the optical device is a combined lens, the lower surface of which is a zigzag Fresnel surface, which can collect light at a large angle and collimate it, and then incident on its upper surface after collimation, the upper surface is The convex surface is used to distribute the collimated incident light from the lower surface to the desired illumination area.

Preferably, the illumination light source is a multicolor LED chip, and the optical device is a diffusion sheet doped with diffusion particles inside for light mixing treatment.

Compared with the prior art, the present invention has the following advantages and effects:

1) The ultra-thin reflective photoelectric keyboard lighting module disclosed in the present invention has the characteristics of simpler structure, lower cost, more convenient assembly, and low height of the switch module. Its height is only 1/2 that of the traditional mechanical axis keyboard 3 to 1/4, more suitable for computer input keyboards, handheld tablet mobile devices, computer mice, and CNC machine tool input devices.

2) The ultra-thin reflective photoelectric keyboard lighting module disclosed in the present invention uses pure photoelectric devices to control the disconnection and access of the switch, without the need for mechanical metal contacts, and its switching life can reach 100 million times, without traditional Mechanical shaft metal contact shrapnel fatigue wear and oxidized patina and other quality problems.

Description of drawings

Fig. 1 is an isometric exploded structure diagram of the switch module of the ultra-thin reflective computer input device disclosed in Embodiment 1;

Fig. 2 is the front exploded view of the switch module of the ultra-thin reflective computer input device disclosed in Embodiment 1;

Fig. 3 is a sectional view along the A-A direction of the switch module button of the ultra-thin reflective computer input device disclosed in Embodiment 1 when the keys are relaxed;

Fig. 4 (a) is the sectional view along the A-A direction under the state that the switch module button of the ultra-thin reflective computer input device disclosed in the present embodiment 1 is pressed;

Fig. 4 (b) is a sectional view of the switch module button of the ultra-thin reflective computer input device disclosed in the present embodiment 1, which is viewed upwards along the arrow T direction in Fig. 1;

Fig. 5 is a cross-sectional view along the D-D direction in Fig. 1 under the state where the switch module keys of the ultra-thin reflective computer input device disclosed in Embodiment 2 are relaxed;

Fig. 6 (a) is the sectional view along the D-D direction in Fig. 1 under the state that the switch module button of the ultra-thin reflective computer input device disclosed in the present embodiment 2 is pressed;

Fig. 6 (b) is a sectional view of the switch module button of the ultra-thin reflective computer input device disclosed in the present embodiment 2, which is viewed upwards along the arrow T direction in Fig. 1;

Fig. 7 is a cross-sectional view along the direction D-D in Fig. 1 of the ultra-thin reflective computer input device disclosed in Embodiment 3 when the switch module key is released;

Fig. 8 is a cross-sectional view along the D-D direction in Fig. 1 under the state that the button of the switch module of the ultra-thin reflective computer input device disclosed in Embodiment 3 is pressed down;

Fig. 9 is a cross-sectional view along the direction B-B in Fig. 1 of the ultra-thin reflective computer input device disclosed in Embodiment 4 when the switch module button is released;

Fig. 10 is a sectional view along the B-B direction in Fig. 1 when the button of the switch module of the ultra-thin reflective computer input device disclosed in Embodiment 4 is pressed down;

Fig. 11 is a sectional view along the B-B direction in Fig. 1 under the state where the switch module button of the ultra-thin reflective computer input device disclosed in Embodiment 5 is released;

Fig. 12 is a sectional view along the B-B direction in Fig. 1 when the button of the switch module of the ultra-thin reflective computer input device disclosed in Embodiment 5 is pressed down;

Fig. 13 is a cross-sectional view along the direction B-B in Fig. 1 of the ultra-thin reflective computer input device disclosed in Embodiment 6 when the switch module button is released;

Fig. 14 is a sectional view along the B-B direction in Fig. 1 when the button of the switch module of the ultra-thin reflective computer input device disclosed in Embodiment 6 is pressed down;

Fig. 15 is a cross-sectional view along the direction B-B in Fig. 1 of the ultra-thin reflective computer input device disclosed in Embodiment 7 when the switch module button is released;

Fig. 16 is a sectional view along the B-B direction in Fig. 1 when the button of the switch module of the ultra-thin reflective computer input device disclosed in Embodiment 7 is pressed down;

Fig. 17 is a cross-sectional view along the B-B direction in Fig. 1 when the switch module button of the ultra-thin reflective computer input device disclosed in Embodiment 8 is released;

Fig. 18 is a cross-sectional view along the B-B direction in Fig. 1 when the button of the switch module of the ultra-thin reflective computer input device disclosed in Embodiment 8 is pressed down;

Fig. 19 is a cross-sectional view along the direction B-B in Fig. 1 of the ultra-thin reflective computer input device disclosed in Embodiment 9 when the switch module button is released;

Fig. 20 is a sectional view along the B-B direction in Fig. 1 when the button of the switch module of the ultra-thin reflective computer input device disclosed in Embodiment 9 is pressed down;

Fig. 21 is a cross-sectional view along the B-B direction in Fig. 1 when the switch module button of the ultra-thin reflective computer input device disclosed in Embodiment 10 is released;

Fig. 22 is a sectional view along the B-B direction in Fig. 1 when the button of the switch module of the ultra-thin reflective computer input device disclosed in Embodiment 10 is pressed down;

Fig. 23 is a cross-sectional view of the ultra-thin reflective computer input device disclosed in Embodiment 11 along the B-B direction in Fig. 1 when the switch module button is released;

Fig. 24 is a sectional view along the B-B direction in Fig. 1 when the button of the switch module of the ultra-thin reflective computer input device disclosed in Embodiment 11 is pressed down;

Fig. 25 is a cross-sectional view along the B-B direction in Fig. 1 when the switch module button of the ultra-thin reflective computer input device disclosed in Embodiment 12 is released;

Fig. 26 is a sectional view along the B-B direction in Fig. 1 when the button of the switch module of the ultra-thin reflective computer input device disclosed in Embodiment 12 is pressed down;

Fig. 27 is a cross-sectional view along the B-B direction in Fig. 1 when the switch module button of the ultra-thin reflective computer input device disclosed in Embodiment 13 is released;

Fig. 28 is a sectional view along the B-B direction in Fig. 1 when the button of the switch module of the ultra-thin reflective computer input device disclosed in Embodiment 13 is pressed down;

Fig. 29 is a cross-sectional view along the direction B-B in Fig. 1 of the switch module of the ultra-thin reflective computer input device disclosed in Embodiment 14 when the keys of the switch module are released;

Fig. 30 is a cross-sectional view along the B-B direction in Fig. 1 when the button of the switch module of the ultra-thin reflective computer input device disclosed in Embodiment 14 is pressed down;

Fig. 31 is a cross-sectional view along the D-D direction in Fig. 1 when the button of the switch module of the ultra-thin reflective computer input device disclosed in Embodiment 15 is pressed;

Fig. 32 is a cross-sectional view of the switch module button of the ultra-thin reflective computer input device disclosed in Embodiment 15, which is viewed upwards in the direction of arrow T in Fig. 1;

Fig. 33 is a cross-sectional view along the B-B direction in Fig. 1 when the switch module button of the ultra-thin reflective computer input device disclosed in Embodiment 16 is released;

Fig. 34 is a sectional view along the B-B direction in Fig. 1 when the button of the switch module of the ultra-thin reflective computer input device disclosed in Embodiment 16 is pressed down;

Fig. 35 is a sectional view along the direction B-B in Fig. 1 of the ultra-thin reflective computer input device disclosed in Embodiment 17 when the button of the switch module is released;

Fig. 36 is a sectional view along the B-B direction in Fig. 1 when the button of the switch module of the ultra-thin reflective computer input device disclosed in Embodiment 17 is pressed down;

Fig. 37 is a cross-sectional view along the B-B direction in Fig. 1 when the switch module button of the ultra-thin reflective computer input device disclosed in Embodiment 18 is released;

Fig. 38 is a sectional view along the B-B direction in Fig. 1 when the button of the switch module of the ultra-thin reflective computer input device disclosed in Embodiment 18 is pressed down;

Fig. 39 is a cross-sectional view along the D-D direction in Fig. 1 when the button of the switch module of the ultra-thin reflective computer input device disclosed in Embodiment 19 is pressed;

Fig. 40 is a cross-sectional view of the switch module button of the ultra-thin reflective computer input device disclosed in Embodiment 19, which is viewed upwards in the direction of arrow T in Fig. 1;

Fig. 41 is a cross-sectional view of the ultra-thin reflective computer input device disclosed in Embodiment 20 along the B-B direction in Fig. 1 when the switch module button is released;

Fig. 42 is a cross-sectional view along the B-B direction in Fig. 1 when the button of the switch module of the ultra-thin reflective computer input device disclosed in Embodiment 20 is pressed down;

Fig. 43 is a sectional view along the direction B-B in Fig. 1 of the ultra-thin reflective computer input device disclosed in Embodiment 21 when the switch module button is released;

Fig. 44 is a sectional view along the B-B direction in Fig. 1 when the button of the switch module of the ultra-thin reflective computer input device disclosed in Embodiment 21 is pressed down;

Fig. 45 is a cross-sectional view along the B-B direction in Fig. 1 of the ultra-thin reflective computer input device disclosed in Embodiment 22 when the switch module button is released;

Fig. 46 is a sectional view along the B-B direction in Fig. 1 when the button of the switch module of the ultra-thin reflective computer input device disclosed in Embodiment 22 is pressed down;

Fig. 47 is a sectional view along the C-C direction in Fig. 1 of the keycap character lighting system disclosed in Embodiment 23 for the photoelectric keyboard switch module;

Fig. 48 is a schematic design diagram of the keycap character lighting system disclosed in Embodiment 23 for the photoelectric keyboard switch module;

Fig. 49 is a sectional view along the C-C direction in Fig. 1 of the keycap character lighting system disclosed in Embodiment 24 for the photoelectric keyboard switch module;

Fig. 50 is a sectional view along the C-C direction in Fig. 1 of the keycap character lighting system disclosed in Embodiment 25 for the photoelectric keyboard switch module;

Fig. 51 is a sectional view along the C-C direction in Fig. 1 of the keycap character lighting system disclosed in Embodiment 26 for the photoelectric keyboard switch module;

Fig. 52 is a sectional view along the direction C-C in Fig. 1 of the keycap character lighting system for the photoelectric keyboard switch module disclosed in the twenty-seventh embodiment.

Detailed ways

In order to make the object, technical solution and advantages of the present invention more clear and definite, the present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

Embodiment one

The switch module of an ultra-thin reflective computer input device involved in the present invention, the isometric side exploded structure diagram of the first embodiment is shown in Figure 1, and the front exploded structure diagram is shown in Figure 2. It consists of keycap 11, key shaft 12, spring 13, upper fixed shell 14, lower fixed shell 15, bottom PCB board (printed circuit board) 16, SMD (Surface Mounted Devices surface mount device) IR tube (Infrared Radiation infrared ray) ) 17 (surface mount infrared diode, or infrared laser diode), SMD PT (Phototransistor phototransistor) 18 (surface mount phototransistor), and SMD LED 19 (surface mount light emitting diode) for keycap character illumination )composition. Described SMD IR tube 17, it is light emitting device. Described SMD PT tube 18, it is light-receiving device. In this specific implementation one, the cross-sectional view along the A-A direction passing through the central point of the SMD IR tube 17 light-emitting surface and the key shaft center O point is shown in Figure 3; the key shaft 12 has a second reflection on the outer side below it Surface 12-1; the upper fixed shell 14 has two first reflective surfaces 14-2 and a third reflective surface 14-3 for the key switch control channel on the lower inner surface, and one on the right side for Trapezoidal reflector 14-1 for keycap character lighting and light distribution; said lower fixed shell 15 has a first through hole 15-1 near the top of the SMD IR tube 17, and its other side is close to the top of the SMD PT tube 18 There is another second through hole 15-2.

The switch module of an ultra-thin reflective computer input device related to the present invention, the working principle of its specific embodiment one is shown in Figure 3 and Figure 4 (a), (b), and Figure 3 is the button release When the state is shown in Fig. 4 (a), (b) is the state when the button is pressed down, Fig. 4 (a) is the light path diagram along the A-A section in Fig. 1, and Fig. 4 (b) is the state in Fig. 1 View the optical path diagram of the upper fixed shell 14 and the key shaft 12 upward along the arrow T direction, which corresponds to the optical path diagram along the section A-A of FIG. 4( a ). The light emitted from the center P point of the SMD IR tube 17 is incident on the first reflective surface 14-2 below the upper fixed shell 14 after passing through the first through hole 15-1 of the lower fixed shell, the first reflective surface described 14-2, it is a free-form surface, which can be an off-axis paraboloid, an off-axis quadratic surface or a polynomial surface, which collimates the incident light and emits it toward the center of the key shaft 12 after collimation. When the button is pressed down to 1.85mm, the second reflective surface 12-1 on the key shaft 12 is just aligned with the first reflective surface 14-2 located under the upper fixed shell 14, and it will collimate the incoming collimated light. reflection. After being reflected by the second reflective surface 12-1 on the key shaft 12, the reflected light is shown in FIG. The third reflection surface 14-3 converges the incident light to the Q point located at the center of the SMD PT tube 18 after passing through the second through hole 15-2 on the lower fixed shell 15, thereby triggering the circuit conduction. When the button is released and the spring returns to its original position, the key shaft moves upwards, driving the second reflective surface 12-1 on the key shaft 12 to move upward together. At this time, the second reflective surface 12-1 on the key shaft 12 and the The first reflective surface 14-2 below the upper fixed shell 14 is completely staggered, the optical path is cut off, there is no trigger current on the SMD PT tube 18, and the connected circuit is in a disconnected state, as shown in Figure 3.

The first reflective surface located under the upper fixed shell is an off-axis paraboloid, an off-axis quadratic surface, or a free-form surface of a polynomial surface, which can also be a pure plane or a composite surface composed of multiple surfaces; The third reflective surface on the other side below the fixed shell is an off-axis paraboloid, an off-axis quadratic surface or a free-form surface of a polynomial surface, which can also be an inclined pure plane or a composite surface composed of multiple surfaces; The first reflective surface is optically coupled with the third reflective surface through the reflection of the second reflective surface.

The first reflective surface, the second reflective surface and the third reflective surface are arranged symmetrically with respect to the center of the key axis, or may be asymmetrically arranged.

The second reflective surface 12-1 on the key shaft 12 in the first embodiment is a high-reflectivity surface, and its reflection coefficient exceeds 80%. The first reflective surface 14-2 located below the upper fixed shell 14 and the third reflective surface 14-3 on the other side described in the first embodiment are also high-reflectivity surfaces, and their reflection coefficient exceeds 80. %, the high-reflectivity surface, which is bright silver or bright gold, can also be high-reflectivity white or light-reflective coating. .

Embodiment two

In the switch module of an ultra-thin reflective computer input device involved in the present invention, the reflective surface on the key shaft can be set as two or more multiple reflective surfaces. The second specific embodiment is an optical path control structure in which the reflective surface on the key shaft is set as two reflective surfaces. Its working principle is shown in Figure 5 and Figure 6. Fig. 5 is a sectional view of the specific embodiment along the D-D direction in Fig. 1, and its working state is the state of the button being released and the spring springing up. Fig. 6 (a) and (b) are respectively the light path diagram along the D-D direction section among Fig. 1 and the optical path diagram of looking up along the arrow T direction of this specific embodiment, and it is that button is in the state of pressing down, and the control principle of its button switch is: When the button is pressed down by 1.85mm, the light emitted from the center point P of the SMD IR tube 17 passes through the first through hole 15-1 on the lower fixed shell 15 and then enters the fourth reflective surface 24 below the upper fixed shell 24. -2, the fourth reflective surface 24-2 is a free-form surface, which can be an off-axis paraboloid, an off-axis quadratic surface or a polynomial surface, which collimates the incident light, and then goes to the left after collimation shoot in the horizontal direction. The fifth reflective surface 22 - 1 on the key shaft 22 is just aligned with the fourth reflective surface 24 - 2 located below the upper fixed shell 24 , and reflects the incident collimated light. The light reflected by the fifth reflective surface 22-1, as shown in Figure 6(b) (looking up at the fixed shell 24 and the key shaft 22 along the arrow T direction in Figure 1), the light turns 90 degrees clockwise and is incident on the Also located on another sixth reflective surface 22-2 on the key shaft 22, after being reflected again, it is incident to the right on the seventh reflective surface 24-3 located on the other side below the upper fixed shell 24, and the seventh reflected The surface 24-3 converges the incident light through the second through hole 15-2 on the lower fixed shell 15 to the Q point located at the center of the SMD PT tube 18, thereby triggering the circuit conduction. When the key is released and the spring returns to its original position, the key shaft moves upward, driving the fifth reflective surface 22-1 and the sixth reflective surface 22-2 on the key shaft 22 to move upward together, and the fifth reflective surface 22-2 on the key shaft 22 moves upward together. The reflective surface 22-1 is completely staggered from the fourth reflective surface 24-2 located under the upper fixed shell 24, and the sixth reflective surface 22-2 located on the key shaft 22 is also aligned with the sixth reflective surface 24-2 below the upper fixed shell 24 for convergence. The seven reflective surfaces 24-3 are staggered, and now the optical path is cut off, there is no trigger current on the SMD PT tube 18, and the connected circuit is in a disconnected state, as shown in Figure 5. The seventh reflective surface 24 - 3 on the other side below the upper fixed shell 24 described in the second embodiment is symmetrical to the fourth reflective surface 24 - 2 with respect to the center of the key axis, and their shapes are exactly the same. Similarly, the sixth reflective surface 22-2 on the other side of the key shaft 22 described in the second embodiment is symmetrical to the fifth reflective surface 22-1 with respect to the center of the key shaft 22, and its shape is exactly the same.

The fourth reflective surface 24-2 located below the upper fixed shell 24 is a free-form surface, which can be an off-axis paraboloid, an off-axis quadratic surface or a polynomial curved surface, which collimates the incident light. Shoots horizontally to the left. The seventh reflective surface 24-3 located below the upper fixed shell 24, its reflective surface is an off-axis paraboloid, an off-axis quadratic surface or a free-form surface of a polynomial surface, which can also be an inclined pure plane or a plurality of surfaces The composite curved surface collimates the incident light and converges it downwards, and the converged light is concentrated on the SMD PT 18 below it.

The fifth reflective surface 22 - 1 on the key shaft 22 in the second embodiment and the sixth reflective surface 22 - 2 on the other side are both high reflectivity surfaces, and their reflection coefficients exceed 80%. The fifth reflective surface 24-2 located under the upper fixed shell 24 and the sixth reflective surface 24-3 on the other side described in the second embodiment are also high-reflectivity surfaces, and their reflection coefficient exceeds 80. %, the high-reflectivity surface, which is bright silver or bright gold, can also be high-reflectivity white or light-reflective coating.

Embodiment Three

The switch module of an ultra-thin reflective computer input device involved in the present invention can adopt a structure in which a collimating/focusing lens is combined with a reflecting surface. Its optical path is composed of multiple reflective surfaces located on the key shaft 32, multiple reflective surfaces located under the upper fixed shell, and a collimating/focusing lens located at the first through hole or/and the second through hole of the lower fixed shell , as shown in the specific embodiment 3 described in Fig. 7 and Fig. 8 . Fig. 7 is a cross-sectional view along the direction D-D in Fig. 1 of this specific embodiment, which shows that the button is in a relaxed state. FIG. 8 is an optical path diagram of a cross-section along the D-D direction in FIG. 1 according to this specific embodiment, which shows that the key is in a depressed state. In this specific embodiment, the reflective surface on the keycap and the key shaft is set, and the same structure as that of the second embodiment is adopted. The reflective surface 34-2 below the upper fixed housing 34 adopts a plane inclined at 45 degrees. A collimating Fresnel lens 35-1 is placed in the position of the first through hole 15-1 of the fixed housing 35, which has a larger numerical aperture and can collect more light. The light is collected and collimated, and the collimated light is reflected by the eighth reflective surface 34 - 2 below the upper fixed housing 34 . When the button is pressed down, the ninth reflective surface 32-1 on the key shaft 32 is just aligned with the eighth reflective surface 34-2 below the upper fixed housing 34, and it will be incident after being reflected by the eighth reflective surface 34-2. The coming light is reflected again, and the reflected light is reflected again by the tenth reflective surface on the other side of the key shaft 32 and the eleventh reflective surface on the other side below the upper fixed housing 34, and finally passes through the lower fixed surface. The focusing Fresnel lens at the position of another second through hole 15-2 of the housing 35 converges, and the light after the convergence is focused into the SMD PT tube 18, and the light path is conducted. When the key is raised, the ninth reflective surface 32-1 on the key shaft 32 is completely staggered from the tenth reflective surface 34-2 below the upper fixed housing 34, and the incident light cannot be reflected by it, and the light path is cut off.

The eighth reflective surface 34-2 located below the upper fixed shell 34 is a plane inclined at 45 degrees, and it can also be an off-axis paraboloid, an off-axis quadratic surface or a free-form surface of a polynomial surface. It can also be a free-form surface composed of A compound surface composed of multiple surfaces; it collimates the incident light and emits it in the horizontal direction to the left after collimation. The eleventh reflective surface 34-3 located under the upper fixed shell 34 is a plane inclined at 45 degrees, and can also be an off-axis paraboloid, an off-axis quadratic surface or a free-form surface of a polynomial surface, and it can also be A composite curved surface composed of multiple surfaces; it collimates the incident light and converges it downward, and the converged light is concentrated on the SMD PT 18 below it. The eighth reflective surface is optically coupled to the eleventh reflective surface through the reflection of the ninth reflective surface and the tenth reflective surface, and the eighth reflective surface, the ninth reflective surface, the tenth reflective surface and the eleventh reflective surface The reflective surface is arranged symmetrically with respect to the center of the key shaft, and may also be arranged asymmetrically.

The ninth reflective surface 32-1 on the key shaft 32 of this specific embodiment, the eighth reflective surface 34-2 located below the upper fixed shell 34, and the reflective surfaces at other positions are all high-reflectivity surfaces. The reflection coefficient exceeds 80%, and the high-reflectance surface is bright silver or bright gold, and can also be high-reflectance white or light-reflecting coating.

Embodiment four

In the switch module of an ultra-thin reflective computer input device involved in the present invention, the reflective surface for controlling the key switch can be integrated with the keycap, and the optical path can be formed by the second free-form surface located under the keycap. The twelve reflective surfaces 41-1 and the free-form surface thirteenth reflective surface 44-2 located on the upper fixed shell are composed.

Specific embodiment 4 controls the twelfth reflection surface 41-1 of key switch to be arranged on the below of keycap, and no reflection surface is provided on the key shaft 42, and its switch control principle is as shown in Figure 9 and Figure 10. Fig. 9 is a cross-sectional view along the B-B direction in Fig. 1 of the specific embodiment, and the button is in a relaxed state. Fig. 10 is an optical path diagram of the section along the B-B direction in Fig. 1 of the specific embodiment, and the button is in a depressed state. The control principle of the key switch is: when the key is pressed down, the twelfth reflective surface 41-1 located under the key cap 41 just aligns with the thirteenth reflective surface 44-2 located on the upper fixed shell 44, from the SMD The light emitted by the IR tube 17 is reflected by the twelfth reflective surface 41-1 and then collimated to the right, and the emitted light is then turned and converged downward by the thirteenth reflective surface 44-2, and the converged light is concentrated to the SMD PT tube 18, thereby triggering the SMD PT tube 18 to generate current, and the circuit connected to it is in a conducting state. When the key is released and the spring returns to its original position, the twelfth reflective surface 41-1 located under the key cap 41 is completely staggered from the thirteenth reflective surface 44-2 located on the upper fixed shell 44, and the light cannot be detected by the thirteenth reflective surface 44-2. Reflecting surface 44-2 converges, thereby can not trigger electric current in SMD PT tube 18, and the circuit connected with it is in off state.

The twelfth reflective surface 41-1 located under the keycap 41 and the thirteenth reflective surface 44-2 located on the upper fixed shell 44 are off-axis paraboloids, off-axis quadratic surfaces or A free-form surface of a polynomial surface, which can also be an inclined pure plane, is a compound surface composed of multiple surfaces. The twelfth reflective surface 41-1 located under the keycap 41 and the thirteenth reflective surface 44-2 located on the upper fixed shell 44 are both high-reflectivity surfaces with a reflection coefficient exceeding 80%. The high-reflectivity surface is bright silver or bright gold, or it can be high-reflectivity white or light-reflective coating. .

Embodiment five

In the switch module of an ultra-thin reflective computer input device involved in the present invention, the control light route of the key switch in the specific embodiment is located on the fourteenth reflective surface 51-1 of the inclined plane below the keycap, and on the lower The collimator lens 55-1 at the position of the first through hole of the fixed shell and the fifteenth free-form reflective surface 54-2 located on the upper fixed shell are composed of the switch control principle shown in Fig. 11 and Fig. 12 . Fig. 11 is a cross-sectional view along the B-B direction in Fig. 1 of the specific embodiment, and the button is in a relaxed state. Fig. 12 is an optical path diagram of the cross-section along the B-B direction in Fig. 1 according to the specific embodiment, which is a state that the key is pressed down. The control principle of the key switch is as follows: when the key is pressed down, the fourteenth reflective surface 51-1 on the inclined plane below the keycap 51 just coincides with the fifteenth reflective surface 54-2 on the free-form surface on the upper fixed shell 54. Alignment, the light emitted from the SMD IR tube 17 is collimated by the Fresnel collimator lens 55-1 located at the first through hole position of the lower fixed shell 55, and then incident on the tenth inclined plane located below the keycap 51. On the four reflective surfaces 51-1, after being reflected by the fourteenth reflective surface 51-1 on the inclined plane, it is collimated and emitted to the right. The final light is concentrated on the SMD PT tube 18, thereby triggering the SMD PT tube 18 to generate current, and the circuit connected to it is in a conducting state. When the button is released and the spring returns to its original position, the fourteenth reflective surface 51-1 on the inclined plane below the keycap 51 is staggered from the fifteenth reflective surface 54-2 on the free-form surface on the upper fixed shell 54, and the light cannot Converged by the fifteenth reflective surface 54-2 of the free-form surface, so that no current can be triggered in the SMD PT tube 18, and the circuit connected to it is in a disconnected state.

The fourteenth reflective surface 51-1 of the inclined plane below the keycap 51 and the fifteenth reflective surface 54-2 of the free-form surface on the upper fixed shell 54 are high-reflectivity surfaces, and their reflection coefficient exceeds 80%, the above-mentioned high-reflectivity surface is bright silver or bright gold, and can also be high-reflectivity white or light-reflecting coating.

Embodiment six

In the switch module of an ultra-thin reflective computer input device involved in the present invention, the control light route of the key switch in the specific embodiment is located at the sixteenth reflective surface 61-1 of the inclined plane below the keycap, and at the bottom of the keycap. The collimator lens 65-1 at the position of the first through hole of the fixed shell, the seventeenth reflector 64-2 on the inclined plane located at the upper fixed shell, and the condenser lens 65-2 at the position of the second through hole of the lower fixed shell are composed of The switch control principle is shown in Figure 13 and Figure 14. Fig. 13 is a cross-sectional view along the direction B-B in Fig. 1 of this specific embodiment, which shows that the button is in a relaxed state. Fig. 14 is an optical path diagram of the cross-section along the B-B direction in Fig. 1 according to the specific embodiment, which is the state that the key is pressed down. The control principle of the key switch is: when the key is pressed down, the inclined plane sixteenth reflective surface 61-1 located under the keycap 61 is just opposite to the inclined plane seventeenth reflective surface 64-2 located on the upper fixed shell 64 The light emitted from the SMD IR tube 17 is collimated by the Fresnel collimator lens 65-1 at the position of the first through hole of the lower fixed shell 65, and then enters the sixteenth inclined plane located below the keycap 61. On the reflective surface 61-1, after being reflected by the sixteenth reflective surface 61-1 on the inclined plane, it is collimated and emitted to the right, and the emitted light passes through the seventeenth reflective surface 64-2 on the inclined plane on the upper fixed shell 64. After the reflection, the light beam turns downwards, and is then converged by the Fresnel condenser lens 65-2 located at the other second through hole position of the lower fixed shell 65, and the light after the convergence is concentrated on the SMD PT tube 18, thereby triggering the SMD The PT tube 18 generates current, and the circuit connected to it is in a conduction state. When the key is released and the spring returns to its original position, the inclined plane sixteenth reflective surface 61-1 located under the keycap 61 and the inclined plane seventeenth reflective surface 64-2 located on the upper fixed shell 64 are completely staggered, and the light cannot Turned by the inclined plane reflective surface 64-2, so that the current cannot be triggered in the SMD PT tube 18, and the circuit connected to it is in a disconnected state.

The sixteenth reflective surface 61-1 of the inclined plane located under the keycap 61 and the seventeenth reflective surface 64-2 of the inclined plane located on the upper fixed shell 64 are oblique 45-degree reflective surfaces with high reflectivity The reflectance of the surface is more than 80%. The high-reflectance surface is bright silver or bright gold, or it can be white with high reflectance or light-reflective coating.

Embodiment seven

In the switch module of an ultra-thin reflective computer input device related to the present invention, the control light route of the key switch in the specific embodiment is located at the eighteenth reflective surface 71-1 of the free-form surface under the keycap, and It is composed of the first refracting prism 75-2 on the free-form surface at the position of the second through hole of the lower fixed shell, and its switch control principle is shown in Fig. 15 and Fig. 16 . Fig. 15 is a cross-sectional view along the direction B-B in Fig. 1 of this specific embodiment, which shows that the button is in a relaxed state. Fig. 16 is an optical path diagram of the cross-section along the B-B direction in Fig. 1 according to the specific embodiment, which is the state that the key is pressed down. The control principle of the key switch is: when the key is pressed down, the eighteenth reflective surface 71-1 of the free-form surface located below the keycap 71 just coincides with the first refracting prism 75 of the free-form surface located at the through hole position of the lower fixed shell 75. -2 aligned, the light emitted from the SMD IR tube 17, after passing through the first through hole positioned at the lower fixed shell 75, is incident on the eighteenth reflecting surface 71-1 of the free-form surface positioned at the bottom of the keycap 71, the tenth The eight reflective surfaces 71-1 collimate and deflect the incident light, and emit it horizontally to the right. The emitted light passes through the first refracting prism 75-2 on the free-form surface located at the through hole of the lower fixed shell 75 for total reflection and convergence. And turning downward, the converged light is concentrated on the SMD PT tube 18, thereby triggering the SMD PT tube 18 to generate current, and the circuit connected to it is in a conducting state. When the button was released and the spring returned to its original position, the eighteenth reflective surface 71-1 of the free-form surface positioned at the bottom of the keycap 71 was completely aligned with the first refracting prism 75-2 of the free-form surface positioned at the position of the through hole of the lower fixed case 75. Staggered, the light cannot be converged by the first refracting prism 75-2 of the free-form surface, so that no current can be triggered in the SMD PT tube 18, and the circuit connected to it is in a disconnected state.

The eighteenth reflective surface 71-1 of the free-form surface under the keycap 71 can be an off-axis paraboloid, an off-axis quadratic surface, or a polynomial curved surface, which is a high-reflectivity surface, and its reflection coefficient exceeds 80%. , which is bright silver or bright gold, and can also be high-reflectivity white or light-reflective coating. The first refracting prism 75-2 of the free-form surface at the second through hole position of the lower fixed shell 75 has a vertical plane near the eighteenth reflection surface 71-1, which is the input surface; There is an inclined free-form total reflection surface on one side of the eighteen reflective surface 71-1, which can be an off-axis paraboloid, an off-axis quadratic surface, or a polynomial curved surface; there is a horizontal plane below it, which is the output surface.

Embodiment Eight

In the switch module of an ultra-thin reflective computer input device involved in the present invention, the control light route of the key switch in the specific embodiment is located at the first light blocking sheet 81-1 below the keycap, and at the lower fixed shell. The second refracting prism 85-1 at the position of the first through hole of 85 is used for collimating and deflecting the free-form surface of the optical path, and the third refraction prism 85-1 at the position of the second through hole of the lower fixed shell 85 is used for deflecting and converging the free-form surface of the optical path Composed of prism 85-2, its switch control principle is shown in Figure 17 and Figure 18. The on and off states of the key switch are reversely set, which means that the circuit is in the conduction state when the key is released, and the circuit is in the off state when the key is pressed.

Fig. 17 is an optical path diagram of the cross-section along the B-B direction in Fig. 1 according to the specific embodiment, which shows that the button is in a relaxed state. Fig. 18 is a cross-sectional view along the direction B-B in Fig. 1 of this specific embodiment, which shows that the button is in a depressed state. The control principle of the key switch is: the second refracting prism 85-1 located on the lower fixed shell 85 for collimating and deflecting the free-form surface of the optical path and the second refracting prism 85-1 also located on the lower fixed shell 85 for deflecting and converging the free-form surface of the optical path The third refracting prisms 85-2 are aligned with each other. When the key is released, the light blocking sheet 81-1 below the keycap 81 does not block the light path between the free-form refracting prism 85-1 and the free-form refracting prism 85-2. Among them, the light emitted from the SMD IR tube 17, after passing through the Fresnel surface below the second refracting prism 85-1 of the free-form surface, is collimated and incident on the inclined total reflection surface above the second refracting prism 85-1 of the free-form surface After being turned by its total reflection surface, it is emitted from the vertical plane on its right. Since the light blocking sheet 81-1 does not block the light, the light output from the vertical plane on the right side of the second refracting prism 85-1 on the free-form surface is incident In the third refracting prism 85-2 on the other side, which is also located on the lower fixed shell 85 and is used for turning and converging the free-form surface of the optical path, after being turned by the inclined total reflection surface above it, it passes through the Fresnel prism below it. The surface converges on the SMD PT tube 18, thereby triggering the SMD PT tube 18 to generate a current, and the circuit connected to it is in a conducting state. When the key is pressed down, the first light-blocking sheet 81-1 located below the keycap 81 moves downwards, which converts the light between the second refracting prism 85-1 on the free-form surface and the third refracting prism 85-2 on the free-form surface. The light is completely blocked. Can not trigger electric current in SMD PT tube 18, the circuit connected with it is in disconnected state. Therefore, the on and off states of the control optical path of the key switch described in this embodiment are completely opposite to those in specific embodiments 1-7.

The first light-blocking sheet 81-1 below the keycap 81 is made of black light-absorbing material, and it is injection-molded with the keycap by two-color injection molding. The first refracting prism 85-1 on the lower fixed shell 85 is used to collimate and deflect the free-form surface of the optical path, and the second refracting prism 85 is also located on the lower fixed shell 85 to deflect and converge the free-form surface of the optical path. -2, above which are inclined planes, and below which are uniform Fresnel surfaces.

Embodiment nine

In the switch module of an ultra-thin reflective computer input device involved in the present invention, the control optical route of the key switch of the specific embodiment is located at the second light blocking sheet 91-1 below the keycap, and at the upper fixed shell. The nineteenth reflective surface 94-1 on the upper housing 94 for collimating and deflecting the light path, and the twentieth reflective surface 94-2 also located on the upper fixed shell 94 for deflecting and converging the optical path. Its switch control principle is shown in Figure 19 and Figure 20. The on and off states of the key switch are reversely set, which means that the circuit is in the conduction state when the key is released, and the circuit is in the off state when the key is pressed.

Fig. 19 is an optical path diagram of the cross-section along the B-B direction in Fig. 1 according to this specific embodiment, which shows that the button is in a relaxed state. Fig. 20 is a cross-sectional view along the direction B-B in Fig. 1 of this specific embodiment, which shows that the button is in a depressed state. The control principle of the key switch is as follows: the nineteenth reflective surface 94-1 located on the upper fixed shell 94 for collimating and turning the optical path and the twentieth reflective surface also located on the upper fixed shell 94 for turning and converging the optical path 94-2 are aligned with each other, when the key is released, the second light blocking sheet 91-1 located below the keycap 91 does not block the light path of the nineteenth reflective surface 94-1 and the twentieth reflective surface 94-2, from the SMD The light emitted by the IR tube 17 is reflected by the nineteenth reflective surface 94-1 on the upper fixed shell 94 for collimating and refracting the light path. There is no obstruction to the light, and the light reflected from the nineteenth reflector 94-1 is incident on the other side, also on the twentieth reflector 94-2, which is also used for turning and converging light paths on the upper fixed shell 94. After the reflection, it finally converges on the SMD PT tube 18 below, thereby triggering the SMD PT tube 18 to generate current, and the circuit connected to it is in a conducting state. And when the button is pressed down, the second light-blocking sheet 91-1 positioned at the bottom of the keycap 91 moves downward, and it blocks the light between the nineteenth reflector 94-1 and the twentieth reflector 94-2 completely. . Can not trigger electric current in SMD PT tube 18, the circuit connected with it is in disconnected state. Therefore, the on and off states of the control optical path of the key switch described in this embodiment are completely opposite to those in specific embodiments 1-7.

The light blocking sheet 91-1 below the keycap 91 is made of black light-absorbing material, and it is injection molded with the keycap by two-color injection molding. The nineteenth reflective surface 94-1 located on the upper fixed shell 94 for collimating and deflecting the optical path, and the twentieth reflective surface 94-2 also located on the upper fixed shell 94 for deflecting and converging the optical path, The reflective surface is an off-axis paraboloid, an off-axis quadratic surface or a free-form surface of a polynomial surface. It can also be an inclined pure plane, which is a compound surface composed of multiple surfaces. It is a high-reflectivity surface with a reflection coefficient of more than 80. %, it is bright silver or bright gold, and it can also be high reflectivity white or light reflective coating.

Embodiment ten

In the switch module of an ultra-thin reflective computer input device involved in the present invention, the control light route of the key switch of the specific embodiment is located at the third light blocking sheet 101-1 below the key cap, located at the lower fixed shell 105 The fourth refracting prism 105-1 on the free-form surface used for collimating and deflecting the optical path at the position of the first through hole, and the twenty-first reflective surface 104- of the free-form surface on the upper fixed shell 104 used for deflecting and converging the optical path 2, and its switch control principle is shown in Figure 21 and Figure 22. The on and off states of the key switch are reversely set, that is, the circuit is in the conduction state when the key is released, and the circuit is in the off state when the key is pressed.

Fig. 21 is an optical path diagram of the cross-section along the B-B direction in Fig. 1 according to this specific embodiment, which shows that the button is in a relaxed state. Fig. 22 is a cross-sectional view along the direction B-B in Fig. 1 of the specific embodiment, which shows that the button is in a depressed state. The control principle of its key switch is: the fourth refracting prism 105-1 on the free-form surface used for collimating and turning the light path on the lower fixed shell 105 and the second free-form surface prism 105-1 on the upper fixed shell 104 for turning and converging the light path. The eleven reflective surfaces 104-2 are aligned with each other. When the key is released, the third light-blocking sheet 101-1 below the keycap 101 does not block the fourth refracting prism 105-1 on the free-form surface and the twentieth refracting prism on the free-form surface. In the light path of a reflective surface 104-2, the light emitted from the SMD IR tube 17 is reflected by the total reflection surface above the fourth refracting prism 105-1 on the lower fixed shell 105 for collimating and turning the free-form surface of the light path Afterwards, the light is collimated from the vertical plane on the right to the right, and since the third light blocking sheet 101-1 does not block the light, the light reflected from the fourth refracting prism 105-1 on the free-form surface is incident on the other On the twenty-first reflective surface 104-2 of the freeform surface used for turning and converging light paths on the upper fixed shell 104 on the side, after reflection, it converges on the SMD PT tube 18 below, thereby triggering the SMD PT tube 18 to generate current, the circuit connected to it is in a conducting state. And when the key is pressed down, the third light-blocking sheet 101-1 located below the keycap 101 moves downwards, and it moves the third refracting prism 105-1 of the free-form surface and the twenty-first reflective surface 104-2 of the free-form surface The light in between is completely blocked. Can not trigger electric current in SMD PT tube 18, the circuit connected with it is in disconnected state. Therefore, the on and off states of the control optical path of the key switch described in this embodiment are completely opposite to those in specific embodiments 1-7.

The third light-blocking sheet 101-1 below the keycap 101 is made of black light-absorbing material, and it is injection molded with the keycap by two-color injection molding. The third refracting prism 105-1, which is located on the lower fixed shell 105 and is used to collimate and bend the free-form surface of the optical path, has a total reflection surface that is an inclined curved surface above, which is an off-axis paraboloid, an off-axis quadratic surface, or It is a free-form surface of a polynomial surface, which can also be an inclined pure plane, or a compound surface composed of multiple surfaces. The twenty-first reflective surface 104-2 on the upper fixed shell 104 used for deflecting and converging the free-form surface of the optical path is an off-axis paraboloid, an off-axis quadric surface, or a polynomial curved surface, which is a high The reflectance surface, whose reflectance exceeds 80%, is bright silver or bright gold, and can also be high reflectivity white or light reflective coating.

Embodiment Eleven

In the switch module of an ultra-thin reflective computer input device involved in the present invention, the control optical route of the key switch of the specific embodiment is located at the fourth light blocking sheet 111-1 below the key cap, and located at the lower fixed shell. 115, the fifth refracting prism 115-1 for collimating and turning the free-form surface of the optical path at the position of the first through hole, and the fifth refracting prism 115-1 also located at the position of the second through hole of the lower fixed shell 115 for turning and converging the free-form surface of the optical path The composition of the hexafold prism 115-2 and its switch control principle are shown in Figure 23 and Figure 24. The on and off states of the key switch are reversely set, that is, the circuit is in the conduction state when the key is released, and the circuit is in the off state when the key is pressed.

Fig. 23 is an optical path diagram of the cross-section along the B-B direction in Fig. 1 according to this specific embodiment, which shows that the button is in a relaxed state. Fig. 24 is a cross-sectional view along the direction B-B in Fig. 1 of this specific embodiment, which shows that the button is in a depressed state. The control principle of the key switch is: the fifth refracting prism 115-1 located on the lower fixed shell 115 for collimating and turning the free-form surface of the optical path and the fifth refracting prism 115-1 also located on the lower fixed shell 115 for turning and converging the free-form surface of the optical path The sixth refracting prisms 115-2 are aligned with each other. When the key is released, the fourth light blocking sheet 111-1 located under the keycap 111 does not block the fifth refracting prism 115-1 on the free-form surface and the sixth refraction on the free-form surface. Between the optical paths of the prisms 115-2, the light emitted from the SMD IR tube 17 is reflected by the total reflection surface above the fifth refracting prism 115-1 on the lower fixed shell 115 for collimating and turning the free-form surface of the optical path , the light is collimated from the vertical plane on the right to the right, and because the fourth light blocking sheet 111-1 does not block the light, the light reflected from the fifth refracting prism 115-1 on the free-form surface is incident on another The sixth refracting prism 115-2 on the side is also located on the lower fixed shell 115 for turning and converging the free-form surface of the optical path, after being reflected by its total reflection surface, it finally converges on the SMD PT tube 18 below, thereby triggering the SMD The PT tube 18 generates current, and the circuit connected to it is in a conduction state. And when the button is pressed down, the fourth light-blocking sheet 111-1 located under the keycap 111 moves downward, which will move the light between the fifth refracting prism 115-1 on the free-form surface and the sixth refracting prism 115-2 on the free-form surface. The light is completely blocked. Can not trigger electric current in SMD PT tube 18, the circuit connected with it is in disconnected state. Therefore the control optical path of the key switch described in this embodiment, its on-off state and the state in specific embodiment 1～7 are completely opposite.

The fourth light-blocking sheet 111-1 below the keycap 111 is made of black light-absorbing material, and is injection-molded with the keycap by two-color injection molding. The fifth refracting prism 115-1 located on the lower fixed shell 115 for collimating and turning the free-form surface of the optical path, and the sixth refracting prism also located on the lower fixed shell 115 for deflecting and converging the free-form surface of the optical path 115-2, the inclined surfaces above it are all off-axis paraboloids, off-axis quadratic surfaces or free-form surfaces of polynomial surfaces, which can also be inclined pure planes or compound surfaces composed of multiple surfaces.

Embodiment 12

In the switch module of an ultra-thin reflective computer input device related to the present invention, the control light route of the key switch in the specific embodiment is located on the 22nd reflective surface 121-1 of the inclined plane below the keycap and The twenty-third reflective surface 121-2 of the inclined plane, the Fresnel lens 125-1 located at the position of the first through hole of the lower fixed shell 125 for collimation, and the same position of the second through hole of the lower fixed shell 125 for It is composed of a Fresnel lens 125-2 for concentrating light and a fifth light blocking sheet 126-1 located on a PCB (printed circuit board). Its switch control principle is shown in Figure 25 and Figure 26. The on and off states of the key switch are reversely set, that is, the circuit is in the conduction state when the key is released, and the circuit is in the off state when the key is pressed.

Fig. 25 is an optical path diagram of the cross-section along the B-B direction in Fig. 1 according to the specific embodiment, which shows that the button is in a relaxed state. Fig. 26 is a cross-sectional view along the direction B-B in Fig. 1 of this specific embodiment, which shows that the button is in a depressed state. The control principle of its key switch is: when the key is relaxed and the spring returns to its original position, the fifth light blocking sheet 126-1 on the PCB (printed circuit board) 126 below does not block the inclined plane below the keycap. Between the twenty-second reflection surface 121-1 and the twenty-third reflection surface 121-2 of the inclined plane, the light emitted from the SMD IR tube 17 passes through the Fresnel lens used for collimation on the lower fixed shell 125 After 125-1 is collimated, it is incident on the twenty-second reflective surface 121-1 of the inclined plane below the keycap. After reflection, the light turns to the right, and then incident on the other side, also located on the inclined plane below the keycap. The twenty-third reflective surface 121-2, after being reflected again, the light is incident downwards into the light-condensing Fresnel lens 125-2 located in the lower fixed shell 125, and finally converges on the SMD PT tube 18 below it, Thereby triggering the generation of electric current in the SMD PT tube 18, the circuit connected with it is in conduction state.

And when the button is pressed down, the keycap moves downward together with the twenty-second reflective surface 121-1 of the inclined plane and the twenty-third reflective surface 121-2 of the inclined plane. Five light-blocking sheets 126-1 completely block the light between the twenty-second reflective surface 121-1 and the twenty-third reflective surface 121-2, and the SMD PT tube 18 does not receive light and cannot trigger current, and The connected circuit is disconnected. Therefore, the on and off states of the control optical path of the key switch described in this embodiment are completely opposite to those in specific embodiments 1-7.

The fifth light-blocking sheet 126-1 on the PCB 126 is made of black light-absorbing material, and is fixed on the PCB by buckling. The twenty-second reflective surface 121-1 of the inclined plane and the twenty-third reflective surface 121-2 of the inclined plane located under the keycap are both high-reflectivity surfaces, and their reflection coefficient exceeds 80%. Available in bright silver or bright gold, also available in high reflectivity white or light reflective coating.

Embodiment Thirteen

In the switch module of an ultra-thin reflective computer input device involved in the present invention, the control light route of the key switch of the specific embodiment is located at the first right-angle prism 131-1 and the second right-angle prism 131 below the keycap -2, the Fresnel lens 135-1 that is used for collimating on the lower fixed shell 135, the Fresnel lens 135-2 that is used for focusing on the lower fixed shell 135, and the PCB board (printed circuit board) ) on the sixth light blocking plate 136-1 composition. Its switch control principle is shown in Figure 27 and Figure 28. The on and off states of the key switch are reversely set, that is, the circuit is in the conduction state when the key is released, and the circuit is in the off state when the key is pressed.

Fig. 27 is an optical path diagram of the cross-section along the B-B direction in Fig. 1 according to the specific embodiment, which shows that the button is in a relaxed state. Fig. 28 is a cross-sectional view along the direction B-B in Fig. 1 of the specific embodiment, which shows that the button is in a depressed state. The control principle of the key switch is: when the key is released and the spring returns to its original position, the sixth light blocking sheet 136-1 on the lower PCB (printed circuit board) 136 does not block the first right angle below the keycap. Between the prism 131-1 and the second right-angle prism 131-2, the light emitted from the SMD IR tube 17 passes through the Fresnel lens 135-1 for collimation on the lower fixed shell 135 and then enters the The first right-angle prism 131-1 below the keycap, after being reflected by the reflective surface above it, the light turns to the right, and enters the second right-angle prism 131-2 on the other side, which is also located under the keycap, and passes through the second right-angle prism 131-2 above it. After the reflective surface is reflected again, the light shoots down to the concentrating Fresnel lens 135-2 located in the lower fixed shell 135, and finally the light converges to the SMD PT tube 18 below, thereby triggering the generation of current in the SMD PT tube 18, and The connected circuit is in conduction state.

And when the button is pressed down, the keycap moves downward together with the first right-angle prism 131-1 and the second right-angle prism 131-2, and the sixth light-blocking sheet 136-1 on the PCB board 136 moves the first right-angle prism 131 -1 and the light between the second rectangular prism 131-2 is blocked completely, does not receive light in the SMD PT tube 18, can not trigger electric current, and the circuit that is connected with it is disconnected state. Therefore, the on and off states of the control optical path of the key switch described in this embodiment are completely opposite to those in specific embodiments 1-7.

The sixth light-blocking sheet 136-1 on the PCB 136 is made of black light-absorbing material, and is fixed on the PCB by buckling. The first right-angle prism 131 - 1 and the second right-angle prism 131 - 2 located below the keycap are both reflective surfaces above which are inclined planes.

Embodiment Fourteen

In the switch module of an ultra-thin reflective computer input device involved in the present invention, the control light route of the key switch in the specific embodiment is located at the twenty-fourth reflective surface 141-1 of the free-form surface below the keycap and The twenty-fifth reflective surface 141-2 of the free-form surface is composed of the seventh light blocking sheet 146-1 located on the PCB (printed circuit board). Its switch control principle is shown in Figure 29 and Figure 30. The on and off states of the key switch are reversely set, that is, the circuit is in the conduction state when the key is released, and the circuit is in the off state when the key is pressed.

Fig. 29 is an optical path diagram of the cross-section along the B-B direction in Fig. 1 according to this specific embodiment, which shows that the button is in a relaxed state. Fig. 30 is a cross-sectional view along the B-B direction in Fig. 1 of the specific embodiment, which shows that the button is in a depressed state. The control principle of its key switch is: when the key is relaxed and the spring returns to its original position, the seventh light blocking sheet 146-1 on the PCB (printed circuit board) 146 below does not block the free-form surface below the keycap. Between the twenty-fourth reflective surface 141-1 and the twenty-fifth reflective surface 141-2 of the free-form surface, the light emitted from the SMD IR tube 17 is incident on the twenty-fourth reflective surface 141 of the free-form surface below the keycap -1, the reflected light is collimated and shot to the right, incident on the twenty-fifth reflective surface 141-2 of the free-form surface on the other side, which is also located under the keycap, and after being reflected again, the light hits Turn downward and converge, and finally focus on the SMD PT tube 18 below, thereby triggering the SMD PT tube 18 to generate current, and the circuit connected to it is in a conducting state. And when the key is pressed down, the keycap moves downward together with the twenty-fourth reflective surface 141-1 of the free-form surface and the twenty-fifth reflective surface 141-2 of the free-form surface, and the seventh light-blocking surface on the PCB 146 moves downward. The sheet 146-1 completely blocks the light between the twenty-fourth reflective surface 141-1 of the free-form surface and the twenty-fifth reflective surface 141-2 of the free-form surface, and the SMD PT tube 18 does not receive light and cannot trigger the current , the circuit connected to it is disconnected. Therefore, the on and off states of the control optical path of the key switch described in this embodiment are completely opposite to those in specific embodiments 1-7.

The seventh light-blocking sheet 146-1 on the PCB 146 is made of black light-absorbing material, and is fixed on the PCB by buckling. The twenty-fourth reflective surface 141-1 of the free-form surface and the twenty-fifth reflective surface 141-2 of the free-form surface located under the keycap are off-axis paraboloids, off-axis quadratic surfaces or polynomial The free-form surface of the curved surface can also be an inclined pure plane, or a compound curved surface composed of multiple surfaces, all of which are high-reflectivity surfaces with a reflection coefficient of more than 80%. It is bright silver or bright gold, or it can be high Reflectivity white or light reflective coating.

Embodiment fifteen

A switch module of an ultra-thin reflective computer input device involved in the present invention, its SMD IR tube 17 can be vertically placed in the upper fixed shell 154, the control principle of the key switch of the specific embodiment and the specific implementation The schemes are basically the same, except that in this specific embodiment, the SMD IR tube 17 is vertically placed in the upper fixed shell 154, and collimated by a Fresnel collimating lens 154-2. Its optical path is arranged on the collimating Fresnel lens 154-2 at the position of the upper fixed shell, the twenty-sixth reflective surface 152-1 on the key shaft, and the twenty-seventh free-form surface located under the upper fixed shell 154 The reflective surface 154-3 is composed.

The control principle of the key switch is shown in Figure 31 and Figure 32, which is the state when the key is pressed and the optical path is turned on. View the light path diagram of the upper fixed shell 154 and the key shaft 152 upwards in the arrow T direction, which corresponds to the light path diagram along the A-A section of Figure 31. Its SMD IR tube 17 is vertically placed in the upper fixed shell 154, and the light emitted from the center point P of the SMD IR tube 17 is collimated by the collimating Fresnel lens 154-2 positioned at the upper fixed shell position, and then goes to The direction of the center of the key shaft 152 is incident on the twenty-sixth reflective surface 152 - 1 located below the key shaft 152 . When the key is pressed down to 1.85mm, the twenty-sixth reflective surface 152-1 on the key shaft 152 is just completely aligned with the collimating Fresnel lens 154-2 located at the position of the upper fixed shell 154. Collimate light, reflect it. After being reflected by the twenty-sixth reflective surface 152-1 below the key shaft 152, the reflected light path is shown in FIG. On, the twenty-seventh reflective surface 154-3 converges and deflects the incident light, and finally converges to the Q point located in the center of the SMD PT tube 18 on the PCB board, thereby triggering the conduction of the circuit. When the key is released and the spring returns to its original position, the key shaft moves upward, driving the reflective surface 152-1 below the key shaft 152 to move upward together. At this time, the twenty-sixth reflective surface 152-1 located below the key shaft 152 The collimating Fresnel lens 154-2 positioned at the upper fixed shell 154 position is completely staggered, the optical path is cut off, there is no trigger current on the SMD PT tube 18, and the connected circuit is in a disconnected state.

The twenty-seventh reflective surface 154-3 of the free curved surface on the other side below the upper fixed shell 154 described in this specific embodiment, its reflective surface is an off-axis paraboloid, an off-axis quadratic surface or a free polynomial curved surface. The curved surface can also be an inclined pure plane, a compound curved surface composed of multiple surfaces, and its reflection coefficient exceeds 80%. It is bright silver or bright gold, or it can be high reflectivity white or light reflection coating. .

Embodiment sixteen

In the switch module of an ultra-thin reflective computer input device involved in the present invention, its SMD IR tube 17 can be vertically placed in the upper fixed shell, and the control optical route of the key switch in the scheme of the sixteenth embodiment The eighth light blocking sheet 161-1 located below the keycap, the collimating Fresnel lens 164-1 used to collimate the light path on the upper fixed shell, and the free lens 164-1 positioned on the lower fixed shell 165 for turning and converging the light path. The seventh refracting prism 165-2 is composed of a curved surface. Its switch control principle is shown in Figure 33 and Figure 34. The on and off states of the key switch are reversely set, which means that the circuit is in the conduction state when the key is released, and the circuit is in the off state when the key is pressed.

Fig. 33 is an optical path diagram of the cross-section along the B-B direction in Fig. 1 according to the specific embodiment, which shows that the button is in a relaxed state. Fig. 34 is a cross-sectional view along the direction B-B in Fig. 1 of the specific embodiment, which shows that the button is in a depressed state. The control principle of the key switch is: the collimating Fresnel lens 164-1 located on the upper fixed shell 164 for collimating the optical path and the seventh refracting prism located on the lower fixed shell 165 for turning and converging the free-form surface of the optical path 165-2 are aligned with each other, when the key is released, the eighth light blocking sheet 161-1 located below the keycap 161 is not blocked between the collimating Fresnel lens 164-1 and the seventh refracting prism 165-2 of the free-form surface In the optical path between, the light emitted from the SMD IR tube 17 vertically placed on the upper fixed shell position, after being collimated by the collimating Fresnel lens 164-1, is emitted from the vertical plane on the right, due to the eighth block The light sheet 161-1 does not block the light, and the light output from the vertical plane on the right side of the collimating Fresnel lens 164-1 is incident on the second free-form surface of the lower fixed shell 165 on the other side for turning and converging light paths. In the seven-fold light prism 165-2, after being turned by the inclined total reflection surface above it, it converges on the SMD PT tube 18 through the focusing Fresnel surface below it, thereby triggering the SMD PT tube 18 to generate current, and the connected The circuit is in conduction state. When the key is pressed down, the eighth light blocking sheet 161-1 located under the key cap 161 moves downward, which will collimate the light between the Fresnel lens 164-1 and the seventh refracting prism 165-2 on the free-form surface Block it completely. Can not trigger electric current in SMD PT tube 18, the circuit connected with it is in disconnected state. Therefore, the on and off states of the control optical path of the key switch described in this embodiment are completely opposite to those in specific embodiments 1-7.

The eighth light-blocking sheet 161-1 below the keycap 161 is made of black light-absorbing material, and is injection-molded with the keycap by two-color injection molding. The seventh refracting prism 165 - 2 located on the lower fixed shell 165 and used for deflecting and converging the free-form surface of the optical path has an inclined plane above it and a Fresnel surface below it.

Embodiment 17

In the switch module of an ultra-thin reflective computer input device involved in the present invention, its SMD IR tube 17 can be placed vertically in the upper fixed shell, and the control optical route of the key switch in the scheme of the seventeenth embodiment The ninth light blocking sheet 171-1 located under the keycap, the collimating Fresnel lens 174-1 located on the upper fixed shell for collimating the optical path, and the free-form surface located on the upper fixed shell 174 for turning and converging the optical path The twenty-eighth reflective surface 174-2 is formed. Its switch control principle is shown in Figure 35 and Figure 36. The on and off states of the key switch are reversely set, which means that the circuit is in the conduction state when the key is released, and the circuit is in the off state when the key is pressed.

Fig. 35 is an optical path diagram of the cross-section along the B-B direction in Fig. 1 according to this specific embodiment, which shows that the button is in a relaxed state. Fig. 36 is a cross-sectional view along the direction B-B in Fig. 1 of this specific embodiment, which shows that the button is in a depressed state. The control principle of the key switch is: the collimating Fresnel lens 174-1 on the upper fixed shell 174 for collimating the optical path and the twenty-eighth free-form surface on the upper fixed shell 174 for turning and converging the optical path. The reflective surfaces 174-2 are aligned with each other, and when the key is released, the ninth light-blocking sheet 171-1 below the keycap 171 is not blocked by the collimating Fresnel lens 174-1 and the twenty-eighth reflective surface of the free-form surface In the optical path between 174-2, the light emitted from the SMD IR tube 17 vertically placed on the upper fixed shell position is emitted from the vertical plane on the right side after being collimated by the collimating Fresnel lens 174-1, Since the ninth light blocking plate 171-1 does not block the light, the light emitted from the collimating Fresnel lens 174-1 is incident on the second free-form surface on the other side of the upper fixed shell 174 for turning and converging light paths. In the twenty-eight reflective surfaces 174-2, after the reflective surfaces converge and turn, the light finally converges on the SMD PT tube 18, thereby triggering the generation of current in the SMD PT tube 18, and the circuit connected to it is in a conducting state. When the key is pressed down, the ninth light-blocking sheet 171-1 located under the keycap 171 moves downwards, which transfers the light between the Fresnel lens 174-1 and the twenty-eighth reflective surface 174-2 of the free-form surface. Block it completely. Can not trigger electric current in SMD PT tube 18, the circuit connected with it is in disconnected state. Therefore, the on and off states of the control optical path of the key switch described in this embodiment are completely opposite to those in specific embodiments 1-7.

The ninth light-blocking sheet 171-1 located below the keycap 171 is made of black light-absorbing material, and it is injection molded with the keycap by two-color injection molding. The twenty-eighth reflective surface 174-2 on the upper fixed shell 174 used to deflect and converge the free-form surface of the light path, the reflective surface is an off-axis paraboloid, an off-axis quadratic surface or a free-form surface of a polynomial surface, It can also be an inclined pure plane, a compound curved surface composed of multiple surfaces, it is a high reflectivity surface, its reflection coefficient exceeds 80%, it is bright silver or bright gold, it can also be high reflectivity white or light reflection plating.

Embodiment eighteen

In the switch module of an ultra-thin reflective computer input device involved in the present invention, its SMD IR tube 17 can be vertically placed in the upper fixed shell, and the control optical route of the key switch in the eighteenth embodiment The tenth light blocking sheet 181-1 located below the keycap, the collimating Fresnel collimating lens 184-1 located on the upper fixed shell for collimating the light path, and the second through hole located at the lower fixed shell 185 for Composed of the eighth refracting prism 185-2 on the free-form surface of the turning and converging light paths. Its switch control principle is shown in Figure 37 and Figure 38. The on and off states of the key switch are reversely set, which means that the circuit is in the conduction state when the key is released, and the circuit is in the off state when the key is pressed.

Fig. 37 is an optical path diagram of the cross-section along the B-B direction in Fig. 1 according to the specific embodiment, which shows that the button is in a relaxed state. Fig. 38 is a cross-sectional view along the direction B-B in Fig. 1 of this specific embodiment, which shows that the button is in a depressed state. The control principle of the key switch is: the collimating Fresnel lens 184-1 located on the upper fixed shell 184 for collimating the optical path and the eighth refracting prism located on the lower fixed shell 185 for turning and converging the free-form surface of the optical path 185-2 are aligned with each other, and when the key is released, the tenth light blocking sheet 181-1 located under the keycap 181 is not blocked between the collimating Fresnel lens 184-1 and the eighth refracting prism 185-2 of the free-form surface In the optical path between, the light emitted from the SMD IR tube 17 vertically placed on the upper fixed shell position, after being collimated by the collimating Fresnel lens 184-1, is emitted from the vertical plane on the right, due to the tenth block The light sheet 181-1 does not block the light, and the light emitted from the vertical plane on the right side of the collimating Fresnel lens 184-1 is incident on the second free-form surface on the lower fixed shell 185 for turning and converging light paths on the other side. In the ten-fold light prism 185-2, after turning and converging by the inclined free-form surface total reflection surface above it, the light finally converges on the SMD PT tube 18 below, thereby triggering the generation of current in the SMD PT tube 18, and the circuit connected to it is in the conduction state. When the key is pressed down, the tenth light-blocking sheet 181-1 located under the keycap 181 moves downward, which completely blocks the light between the Fresnel lens 184-1 and the eighth refracting prism 185-2 on the free-form surface . Can not trigger electric current in SMD PT tube 18, the circuit connected with it is in disconnected state. Therefore, the on and off states of the control optical path of the key switch described in this embodiment are completely opposite to those in specific embodiments 1-7.

The tenth light-blocking sheet 181-1 below the keycap 181 is made of black light-absorbing material, and it is injection molded with the keycap by two-color injection molding. The eighth refracting prism 165-2, which is located on the lower fixed shell 185 and is used for turning and converging the free-form surface of the optical path, has an inclined total reflection surface above it that is an inclined off-axis paraboloid, an off-axis quadratic surface, or a polynomial A curved surface can also be an inclined pure plane, or a compound surface composed of multiple surfaces, with a plane below it.

Embodiment nineteen

In the switch module of an ultra-thin reflective computer input device involved in the present invention, its SMD PT tube 18 can be vertically placed in the upper fixed shell 194, and the control principle of the key switch in the nineteenth specific embodiment It is basically consistent with the specific embodiment two, except that in this specific embodiment, the SMD PT tube 18 is vertically placed in the upper fixed shell 194, and a condensing Fresnel lens 194-3 is placed in front of it to converge. Its optical path is placed on the twenty-ninth reflective surface 194-2 of the free-form surface at the position of the upper fixed shell, the thirtieth reflective surface 192-1 on the key shaft, and the thirty-first reflective surface on the other side of the key shaft. surface 192-2, and a concentrating Fresnel lens 194-3 located on the other side of the upper fixed shell 194.

Figure 39 and Figure 40 are the optical path diagrams when the key switch is pressed down by 1.85mm and in the conduction state. Figure 39 is the optical path diagram along the D-D section in Figure 1, and Figure 40 is the upward view along the arrow T direction in Figure 1 The optical path diagram of the upper fixed shell 194 and the key shaft 192 corresponds to the optical path diagram along the section A-A in the above figure. The control principle of the key switch is: when the key is pressed down by 1.85mm, the light emitted from the center point P of the SMD IR tube 17 passes through the first through hole 15-1 of the lower fixed shell and then enters the bottom of the upper fixed shell 194. On the twenty-ninth reflective surface 194-2, the twenty-ninth reflective surface 194-2 is a free-form surface, which can be an off-axis paraboloid, an off-axis quadratic surface or a polynomial curved surface, which will incident The light rays are collimated, and after collimation, they are emitted in the horizontal direction to the left. The thirtieth reflective surface 192 - 1 on the key shaft 192 is exactly aligned with the twenty-ninth reflective surface 194 - 2 located under the upper fixing shell 194 , and it reflects the incident collimated light. The light reflected by the thirtieth reflective surface 192-1, as shown in Figure 40 (looking up the fixed shell 194 and the X-shaped key shaft 192 along the arrow T direction in Figure 1), the light turns 90 degrees clockwise to the other Reflected on one side, then incident on another thirty-first reflective surface 192-2 that is also located on the key shaft 192, after being reflected and turned again, it is incident to the right on the condensing phenanthrene located on the other side of the upper fixed shell 194 In the Nel lens 194-3, after the converging Fresnel lens 194-3 converges, the light is finally concentrated on the Q point at the center of the SMD PT tube 18 placed vertically on the upper fixed shell 194, thereby triggering the circuit conduction.

When the key is released and the spring returns to its original position, the key shaft moves upward, driving the 30th reflective surface 192-1 and the 31st reflective surface 192-2 on the key shaft 192 to move upward together, and are located on the key shaft 192 The thirtieth reflective surface 192-1 is completely staggered from the twenty-ninth reflective surface 194-2 located below the upper fixed shell 194, and the thirty-first reflective surface 192-2 located on the key shaft 192 is also located on the upper fixed shell. The concentrating Fresnel lens 194-3 on the other side of the shell 194 is completely staggered, and now the light path is cut off, and there is no trigger current on the SMD PT tube 18, and the connected circuit is in a disconnected state.

The thirtieth reflective surface 192-1 and the thirty-first reflective surface 192-2 on the key shaft 192 in this specific embodiment are high-reflectivity surfaces, and their reflection coefficients exceed 80%. The reflective surface 194-2 located under the upper fixed shell 194 described in this specific embodiment is also a high-reflectivity surface, and its reflection coefficient exceeds 80%. The high-reflectivity surface is bright silver or bright silver. Gold, also available as high reflectivity white or light reflective coating.

Example 20

In the switch module of an ultra-thin reflective computer input device involved in the present invention, its SMD PT tube 18 can be placed vertically in the upper fixed shell 204, and the control light of the key switch in the scheme of the twenty-first embodiment Route the eleventh light-blocking sheet 201-1 below the keycap, the ninth refracting prism 205-1 on the lower fixed shell 205 to collimate and bend the free-form surface of the light path, and the other side of the eleventh light-blocking sheet It consists of a converging Fresnel lens 204-1 located on the upper fixed shell 204 for converging light path. Its switch control principle is shown in Figure 41 and Figure 42. The on and off states of the key switch are reversely set, which means that the circuit is in the conducting state when the key is released, and the circuit is in the off state when the key is pressed.

Fig. 41 is an optical path diagram of the cross-section along the B-B direction in Fig. 1 according to the specific embodiment, which shows that the button is in a relaxed state. Fig. 42 is a cross-sectional view along the direction B-B in Fig. 1 of this specific embodiment, which shows that the button is in a depressed state. The control principle of the key switch is as follows: the ninth refracting prism 205-1 on the free-form surface of the lower fixed shell 205 for collimating and turning the light path and the other side of the eleventh light blocking plate are located on the upper fixed shell 204 The converging Fresnel lenses 204-1 for converging light paths are aligned with each other, and when the key is released, the eleventh light-blocking sheet 201-1 below the keycap 201 does not block the ninth refracting prism on the free-form surface. In the optical path between 205-1 and the concentrating Fresnel lens 204-1, the light emitted from the SMD IR tube 17 positioned on the PCB 16 below collimates and turns through the ninth refracting prism 205-1 of the free-form surface Afterwards, it is collimated from the vertical plane on the right, and since the eleventh light-blocking sheet 201-1 does not block the light, the light that is collimated from the vertical plane on the right side of the ninth refracting prism 205-1 on the free-form surface is incident on the On the other side, in the light-condensing Fresnel lens 204-1 that is used for converging light paths on the upper fixed shell 204, after converging, it finally concentrates on the SMD PT tube 18 that is also positioned vertically on the upper fixed shell 204, thereby A current is generated in the trigger SMD PT tube 18, and the circuit connected to it is in a conduction state.

When the key is pressed down, the eleventh light-blocking sheet 201-1 located below the keycap 201 moves downward, which converts the light between the ninth refracting prism 205-1 of the free-form surface and the converging Fresnel lens 204-1 The light is completely blocked. Current cannot be triggered in the SMD PT tube 18 placed vertically, and the circuit connected to it is in disconnected state. Therefore, the on and off states of the control optical path of the key switch described in this embodiment are completely opposite to those in specific embodiments 1-7.

The eleventh light-blocking sheet 201-1 below the keycap 201 is made of black light-absorbing material, and it is injection molded with the keycap by two-color injection molding. The ninth refracting prism 205-1 located on the lower fixed shell 205 for collimating and deflecting the free-form surface of the optical path, the inclined total reflection surface above it is an inclined off-axis paraboloid, off-axis quadratic surface, or A polynomial surface can also be a sloped pure plane, or a compound surface composed of multiple faces with a plane underneath.

Embodiment 21

In the switch module of an ultra-thin reflective computer input device involved in the present invention, its SMD PT tube 18 can be placed vertically below the key cap 211, and it is used for turning the thirty-second angle of the inclined plane of the optical path. The reflective surface 211-1 and the condensing Fresnel lens 211-2 can also be fixed under the keycap 211, and the twelfth light blocking sheet 216-1 can be fixed on the PCB board 216 at the bottom of the module.

The control light route of the key switch of the scheme of the specific embodiment 21 is located at the inclined plane 32nd reflective surface 211-1 for turning the light path below the keycap, the concentrating Fresnel lens 211-2, and is located at the lower fixed A collimating Fresnel lens 215-1 used for collimation at the position of the first through hole of the shell 215, and a twelfth light blocking sheet 216-1 located on the PCB 216 are composed. Its key switch control principle is shown in Figure 43 and Figure 44. The on and off states of the key switch are reversely set, which means that the circuit is in the conducting state when the key is released, and the circuit is in the off state when the key is pressed.

Fig. 43 is an optical path diagram of the cross-section along the B-B direction in Fig. 1 according to this specific embodiment, which shows that the button is in a relaxed state. Fig. 44 is a cross-sectional view along the direction B-B in Fig. 1 of this specific embodiment, which shows that the button is in a depressed state. The control principle of the key switch is as follows: the inclined plane thirty-second reflective surface 211-1 located under the keycap for turning the light path is aligned with the concentrating Fresnel lens 211-2 also located under the keycap for converging light , when the button is released and the spring returns to its original position, the twelfth light-blocking sheet 216-1 on the PCB board 216 at the bottom of the button module does not block the thirty-second reflective surface 211-1 of the inclined plane and the Fresnel Between the condenser lenses 211-2, the light emitted from the SMD IR tube 17 is collimated by the collimating Fresnel lens 215-1 at the position of the first through hole of the lower fixed shell 215, and then enters the keycap below the On the thirty-second reflective surface 211-1 of the inclined plane, after reflection, the collimated light turns to the right, and then enters the light-condensing Fresnel lens 211-2, and finally concentrates on the vertically placed SMD PT after being converged. On the tube 18, thereby triggering the generation of current in the SMD PT tube 18, the circuit connected to it is in a conducting state.

When the button is pressed down, the twelfth light-blocking sheet 216-1 on the PCB board 216 at the bottom of the button module will place between the thirty-second reflective surface 211-1 of the inclined plane and the concentrating Fresnel lens 211-2 The light of the keycap is completely blocked, and the SMD PT tube 18 placed vertically below the key cap cannot trigger current, and the circuit connected to it is in a disconnected state. Therefore, the on and off states of the control optical path of the key switch described in this embodiment are completely opposite to those in specific embodiments 1-7.

The twelfth light-blocking sheet 216-1 on the PCB 216 is made of black light-absorbing material, and is fixed on the PCB by buckling. The thirty-second reflective surface 211-1 located on the inclined plane below the keycap is a high-reflectance surface with a reflection coefficient of more than 80%, and it is bright silver or bright gold, and it can also be a high-reflectance surface White or light reflective coating.

The condensing Fresnel lens 211-2 and the vertically placed SMD PT tube 18 located below the keycap can be fixed below the keycap by snap-fitting.

Example 22

In the switch module of an ultra-thin reflective computer input device involved in the present invention, its SMD PT tube 18 can be placed vertically below the keycap 211, and it is used for turning the third rectangular prism 221-1 of the light path. 1. The concentrating Fresnel lens 221-2 can also be fixed under the keycap 221, and the thirteenth light blocking sheet 226-1 can be fixed on the PCB board 226 at the bottom of the module.

The control optical route of the key switch in the specific embodiment 22 is the third right-angle prism 221-1 for turning the optical path below the keycap, the concentrating Fresnel lens 221-2, and the first The Fresnel lens 225 - 1 used to collimate the light path at the position of the through hole and the thirteenth light blocking sheet 226 - 1 located on the PCB 226 are composed. Its switch control principle is shown in Figure 45 and Figure 46. The on and off states of the key switch are reversely set, which means that the circuit is in the conduction state when the key is released, and the circuit is in the off state when the key is pressed.

Fig. 45 is an optical path diagram of the cross-section along the B-B direction in Fig. 1 according to the specific embodiment, which shows that the button is in a relaxed state. Fig. 46 is a cross-sectional view along the direction B-B in Fig. 1 of the specific embodiment, which shows that the button is in a depressed state. The control principle of the key switch is as follows: the third rectangular prism 221-1 located under the keycap for turning the light path is aligned with the concentrating Fresnel lens 221-2 also located under the keycap for converging light. 1. When the spring returns to its original position, the thirteenth light blocking sheet 226-1 located on the PCB board 226 at the bottom of the button module is not blocked between the third rectangular prism 221-1 and the concentrating Fresnel lens 221-2, After the light emitted from the SMD IR tube 17 is collimated by the collimating Fresnel lens 225-1 at the position of the first through hole of the lower fixed shell 225, it is incident on the third rectangular prism 221-1 located below the key cap, After being totally reflected by its inclined plane, the collimated light turns to the right, and then enters the concentrating Fresnel lens 221-2, and finally converges on the vertically placed SMD PT tube 18, thereby triggering the generation of light in the SMD PT tube 18. current, the circuit connected to it is in a conducting state.

When the button is pressed down, the thirteenth light blocking sheet 226-1 on the PCB board 226 at the bottom of the button module completely blocks the light between the third rectangular prism 221-1 and the concentrating Fresnel lens 221-2, Current cannot be triggered in the SMD PT tube 18 placed vertically, and the circuit connected to it is in disconnected state. Therefore, the on and off states of the control optical path of the key switch described in this embodiment are completely opposite to those in specific embodiments 1-7.

The thirteenth light-blocking sheet 226-1 on the PCB 226 is made of black light-absorbing material, and is fixed on the lower PCB by buckling. The third right-angle prism 221-1, the condensing Fresnel lens 221-2 and the vertically placed SMD PT tube 18 located below the keycap can be fixed under the keycap by a buckle method.

The upper part of the third rectangular prism 221-1 is a reflective surface with an inclined plane.

Embodiment 23

This embodiment discloses a keycap character lighting system used in conjunction with the switch module of an ultra-thin reflective computer input device, the lighting source is an SMD LED (surface-mounted light-emitting diode) arranged on a PCB, It is a single-color chip or an LED with red, green, blue and white multi-color chips. There is an optical device for light distribution above it, which distributes the light emitted by the SMD LED19 to the required lighting range. The optical device for light distribution is located on the upper fixed shell 234, which can be a trapezoidal reflector, a square reflector, a free-form polarized lens, or a diffusion sheet doped with diffusion particles inside for light mixing treatment. Whether it is a trapezoidal reflector or a square reflector, the reflective surface is a high-reflectance surface with a reflection coefficient exceeding 80%, and it can be white or bright silver. The optical device used for light distribution in this embodiment adopts a trapezoidal reflector.

Embodiment 24

This embodiment discloses a keycap character lighting system used in conjunction with the switch module of an ultra-thin reflective computer input device, the lighting source is an SMD LED (surface-mounted light-emitting diode) arranged on a PCB, It is a single-color chip or an LED with red, green, blue and white multi-color chips. There is an optical device for light distribution above it, which distributes the light emitted by the SMD LED19 to the required lighting range.

The light distribution principle of the keycap character lighting system is shown in FIG. 49 , which is a cross-sectional view along the direction C-C in FIG. 1 . Above the SMD LED (surface-mounted light-emitting diode) 19 in the figure is an eccentric lens 244-1, which is located above the lower fixed shell 245, and performs asymmetric light distribution on the light emitted by the SMD LED 19, and the light is biased to one side , assigned to the required lighting range. The upper curved surface of the eccentric lens 244-1 is an eccentric and asymmetric free-form surface, which can solve the situation that the illuminated key cap characters are not directly above the light source.

Example 25

This embodiment discloses a keycap character lighting system used in conjunction with the switch module of an ultra-thin reflective computer input device, the lighting source is an SMD LED (surface-mounted light-emitting diode) arranged on a PCB, It is a single-color chip or an LED with red, green, blue and white multi-color chips. There is an optical device for light distribution above it, which distributes the light emitted by the SMD LED19 to the required lighting range.

The light distribution principle of the keycap character lighting system is shown in FIG. 50 , which is a cross-sectional view along the direction C-C in FIG. 1 . Among the figure, above the SMD LED (surface-mounted light-emitting diode) 19 is a total reflection lens 254-1, which is positioned above the lower fixed shell 255, and it distributes the light emitted by the SMD LED 19. Described total reflection lens 254-1, it is made up of the refraction part in the middle, the total reflection part of outer ring, and it has higher optical efficiency, and it can collect almost all light that sends from SMD LED19, and optical efficiency can reach More than 80%.

Embodiment 26

This embodiment discloses a keycap character lighting system used in conjunction with the switch module of an ultra-thin reflective computer input device, the lighting source is an SMD LED (surface-mounted light-emitting diode) arranged on a PCB, It is a single-color chip or an LED with red, green, blue and white multi-color chips. There is an optical device for light distribution above it, which distributes the light emitted by the SMD LED19 to the required lighting range.

The light distribution principle of the keycap character lighting system is shown in FIG. 51 , which is a cross-sectional view along the direction C-C in FIG. 1 . Among the figure, the top of SMD LED (surface-mounted light-emitting diode) 19 is the lighting system that adopts combination lens 264-1, and described combination lens 264-1, its lower surface is a zigzag Fresnel surface, which can collect large The light rays at different angles are collimated, and then incident on the upper surface after collimation. The upper surface is convex, which is used for light distribution, and distributes the collimated incident light from the lower surface to the required lighting area. The light distribution principle of the combination lens is shown in FIG. 51 , which is a cross-sectional view along the direction C-C in FIG. 1 . Among the figure, above the SMD LED (surface-mounted light emitting diode) 19 is a combination lens 264-1, which is positioned above the lower fixed shell 265, and it distributes the light emitted by the SMD LED 19.

Embodiment 27

This embodiment discloses a keycap character lighting system used in conjunction with the switch module of an ultra-thin reflective computer input device, the lighting source is an SMD LED (surface-mounted light-emitting diode) arranged on a PCB, It is a single-color chip or an LED with red, green, blue and white multi-color chips. There is an optical device for light distribution above it, which distributes the light emitted by the SMD LED19 to the required lighting range.

The light distribution principle of the keycap character lighting system is shown in FIG. 51 , which is a cross-sectional view along the direction C-C in FIG. 1 . The lighting system of the keycap characters in the twenty-seventh embodiment is a color mixing system using a diffuser, and its lighting source is an SMD LED with red, green, blue and white multi-color chips. The light distribution principle of the keycap character lighting system is shown in Figure 51, which is a cross-sectional view along the direction C-C in Figure 1 . The SMD LED 19 is a multi-chip (such as red, green, blue, and white 4-color chip) that can emit different colors of surface-mounted LEDs. A diffusion sheet 274-1 with a color mixing function is placed above it. The inside is doped with many micron-scale light-diffusing particles, which are located on the top of the lower fixed shell 275, and it mixes the light of different colors emitted by the SMD LED 19 to achieve the effect of uniformly illuminating the keycap characters.

The above-mentioned embodiment is a preferred embodiment of the present invention, but the embodiment of the present invention is not limited by the above-mentioned embodiment, and any other changes, modifications, substitutions, combinations, Simplifications should be equivalent replacement methods, and all are included in the protection scope of the present invention.

Claims (63)

1. A switch module of an ultra-thin reflective computer input device, comprising a keycap, a key shaft, a spring, an upper fixed shell, a lower fixed shell, and a PCB board, wherein the ultra-thin reflective photoelectric The keyboard switch module also includes a light-emitting device and a light-receiving device. The optical path channel is formed between the light-emitting device and the light-receiving device through at least one reflective surface. On the shell or the lower fixed shell, when the button is pressed or released, the up and down movement of part of the reflective surface makes the light path be turned on or off, thereby triggering the on and off of the circuit connected to the light receiving device. 2. The switch module of an ultra-thin reflective computer input device according to claim 1, wherein the light-emitting device and the light-receiving device are all arranged on the PCB board, and the The lower fixing shell is provided with a first through hole and a second through hole, and the first through hole is located above the light emitting device, and the second through hole is located above the light receiving device. 3. The switch module of an ultra-thin reflective computer input device according to claim 2, wherein the optical path channel includes a second reflective surface located below the key shaft, and a second reflective surface located on the upper fixed housing the first reflective surface and the third reflective surface below, The light emitted from the light-emitting device is incident on the first reflective surface below the upper fixed shell after passing through the first through hole on the lower fixed shell. When the key is pressed down, the second reflective surface on the key shaft just faces the The first reflective surface located below the upper fixed shell reflects the collimated light incident from the first reflective surface, and the reflected light is incident on the third reflective surface on the other side below the upper fixed shell above, the third reflective surface converges the incident light to the light receiving device on the PCB board through the second through hole of the lower fixed shell, thereby triggering the conduction of the circuit; When the key release spring returns to the original position, the key shaft and the first reflective surface move upward together, the second reflective surface on the key shaft is staggered from the first reflective surface below the upper fixed shell, and the optical path is cut off and connected circuit is disconnected. 4. The switch module of an ultra-thin reflective computer input device according to claim 3, characterized in that, The first reflective surface located under the upper fixed shell is an off-axis paraboloid, an off-axis quadratic surface, or a free-form surface of a polynomial surface, which can also be a pure plane or a composite surface composed of multiple surfaces; The third reflective surface on the other side below the fixed shell is an off-axis paraboloid, an off-axis quadratic surface or a free-form surface of a polynomial surface, which can also be an inclined pure plane or a composite surface composed of multiple surfaces; The first reflective surface is optically coupled with the third reflective surface through the reflection of the second reflective surface. 5. The switch module of an ultra-thin reflective computer input device according to claim 4, wherein the first reflective surface, the second reflective surface and the third reflective surface are relative to the center of the key shaft. Symmetrical settings can also be asymmetrical settings. 6. The switch module of an ultra-thin reflective computer input device according to claim 2, wherein the optical path channel includes a fifth reflective surface and a sixth reflective surface located below the key shaft, and The fourth reflective surface and the seventh reflective surface located under the upper fixed shell, The light emitted from the light-emitting device is incident on the fourth reflective surface below the upper fixed shell after passing through the first through hole on the lower fixed shell. When the button is pressed down, the fifth reflective surface on the key shaft is just opposite to The fourth reflective surface located below the upper fixed shell reflects the collimated light incident from the fourth reflective surface, and the reflected light is incident on the sixth reflective surface also located on the other side of the key shaft. On the reflective surface, after being reflected again, the reflected light is incident on the seventh reflective surface under the upper fixed shell, and the seventh reflective surface converges the incident light through the second through hole of the lower fixed shell to the second through hole on the PCB board. The light-receiving device, thus triggering the circuit conduction; When the key release spring returns to its original position, the key shaft moves upward, and the key shaft and the fifth and sixth reflective surfaces move upward together. The fifth reflective surface on the key shaft and the fourth reflective surface located under the upper fixed shell The reflective surfaces are staggered, and at the same time, the sixth reflective surface on the key shaft is staggered from the seventh reflective surface below the upper fixed shell, the optical path is cut off, and the connected circuit is in a disconnected state. 7. The switch module of an ultra-thin reflective computer input device according to claim 6, characterized in that, The fourth reflective surface located under the upper fixed shell is an off-axis paraboloid, an off-axis quadratic surface, or a free-form surface of a polynomial surface. It can also be a pure plane or a composite surface composed of multiple surfaces. The seventh reflective surface located on the other side below the upper fixed shell, its reflective surface is an off-axis paraboloid, an off-axis quadratic surface, or a free-form surface of a polynomial surface, which can also be an inclined pure plane, or a plurality of surfaces composed of composite surfaces. The fourth reflective surface is optically coupled with the seventh reflective surface through the reflection of the fifth reflective surface and the sixth reflective surface. 8. The switch module of an ultra-thin reflective computer input device according to claim 7, wherein the fourth reflective surface, the fifth reflective surface, the sixth reflective surface and the seventh reflective surface The surface is arranged symmetrically with respect to the center of the key shaft, and may also be asymmetrically arranged. 9. The switch module of an ultra-thin reflective computer input device according to claim 2, wherein the optical path channel includes a ninth reflective surface and a tenth reflective surface located below the key shaft, located at The eighth reflective surface and the eleventh reflective surface under the upper fixed shell, and the collimating lens at the first through hole position or/and the focusing lens at the second through hole position of the lower fixed shell, The light emitted from the light-emitting device is incident on the eighth reflective surface below the upper fixed housing after passing through the collimating lens at the position of the first through hole on the lower fixed housing. The reflective surface is just aligned with the eighth reflective surface located under the upper fixed shell, which reflects the collimated light incident from the eighth reflective surface, and the reflected light is incident on the other side also located on the key shaft. The tenth reflective surface is reflected again, and the reflected light is incident on another eleventh reflective surface below the upper fixed shell, and the eleventh reflective surface passes the incident light through the second channel on the lower fixed shell. The focusing lens at the hole position converges to the light-receiving device on the PCB board, thereby triggering the conduction of the circuit; When the key release spring returns to its original position, the key shaft moves upward, and the key shaft and the ninth and tenth reflective surfaces move upward together. The ninth reflective surface on the key shaft and the eighth reflective surface below the upper fixed shell The reflective surfaces are staggered, and at the same time, the tenth reflective surface on the key shaft is staggered from the eleventh reflective surface below the upper fixed shell, the optical path is cut off, and the connected circuit is in a disconnected state. 10. The switch module of an ultra-thin reflective computer input device according to claim 9, characterized in that, The eighth reflective surface located below the upper fixed shell is a plane inclined at 45 degrees, and can also be an off-axis paraboloid, an off-axis quadratic surface, or a free-form surface of a polynomial surface, or it can be a composite surface composed of multiple surfaces. surface; The eleventh reflective surface located on the other side below the upper fixed shell, its reflective surface is a plane inclined at 45 degrees, and can also be an off-axis paraboloid, an off-axis quadratic surface or a free-form surface of a polynomial surface, which can also be is a composite surface composed of multiple faces; The eighth reflective surface is optically coupled with the eleventh reflective surface through reflections from the ninth reflective surface and the tenth reflective surface. 11. The switch module of an ultra-thin reflective computer input device according to claim 10, wherein the eighth reflective surface, the ninth reflective surface, the tenth reflective surface and the eleventh reflective surface The reflective surface is arranged symmetrically with respect to the center of the key shaft, and may also be arranged asymmetrically. 12. The switch module of an ultra-thin reflective computer input device according to claim 2, wherein the optical path channel includes a twelfth reflective surface located under the keycap and a twelfth reflective surface located on the upper fixed shell. The thirteenth reflector, The light emitted from the light-emitting device is incident on the twelfth reflective surface under the key cap after passing through the position of the first through hole on the lower fixed shell. When the key is pressed down, the twelfth reflective surface under the key cap is Align with the thirteenth reflective surface of the upper fixed shell, which collimates or partially collimates the incident light from the twelfth reflective surface, and the emitted light passes through the thirteenth reflective surface to the Turning down and converging, the converged light is concentrated to the light receiving device of the PCB board through the second through hole on the lower fixed shell, thereby triggering the circuit conduction; When the key release spring returns to the original position, the twelfth reflective surface located under the key cap is completely staggered from the thirteenth reflective surface located on the upper fixed shell, the optical path is cut off, and the connected circuit is disconnected. 13. The switch module of an ultra-thin reflective computer input device according to claim 12, characterized in that, the twelfth reflective surface located under the keycap and the thirteenth reflective surface located on the upper fixed shell The reflective surfaces are all off-axis paraboloids, off-axis quadratic surfaces or free-form surfaces of polynomial surfaces, which can also be inclined pure planes or composite surfaces composed of multiple surfaces. 14. The switch module of an ultra-thin reflective computer input device according to claim 2, wherein the optical path channel includes a collimating lens located at the first through hole of the lower fixed shell, and a collimating lens located at the key The fourteenth reflective surface under the cap and the fifteenth reflective surface on the free-form surface of the upper fixed shell, The light emitted from the light-emitting device is collimated and incident on the fourteenth reflective surface under the keycap after passing through the collimating lens at the position of the first through hole on the lower fixed shell. The fourteenth reflective surface is just aligned with the fifteenth reflective surface of the upper fixed shell, which collimates the incident light from the fourteenth reflective surface, and the emitted light passes through the fifteenth reflective surface The face turns and converges downwards, and the converged light is concentrated to the light receiving device of the PCB board through the second through hole on the lower fixed shell, thereby triggering the conduction of the circuit; When the key release spring returns to the original position, the fourteenth reflective surface located under the key cap is completely staggered from the fifteenth reflective surface located on the upper fixed shell, the optical path is cut off, and the connected circuit is disconnected. 15. The switch module of an ultra-thin reflective computer input device according to claim 14, characterized in that, The fourteenth reflective surface located under the keycap is an inclined plane, and the fifteenth reflective surface located on the upper fixed shell is an off-axis paraboloid, an off-axis quadratic curved surface, or a free-form surface of a polynomial curved surface, which can also be Slope a pure plane, or a compound surface composed of multiple faces. 16. The switch module of an ultra-thin reflective computer input device according to claim 2, wherein the optical path channel includes a collimating lens located at the first through hole of the lower fixed shell, and a collimating lens located at the key The sixteenth reflective surface under the cap, the seventeenth reflective mirror located on the upper fixed shell, and the condenser lens located at the second through hole of the lower fixed shell, The light emitted from the light-emitting device is collimated and incident on the sixteenth reflective surface under the keycap after passing through the collimating lens at the position of the first through hole on the lower fixed shell. The sixteenth reflective surface is just aligned with the seventeenth reflective surface of the upper fixed shell, which collimates the incident light from the sixteenth reflective surface, and the emitted light passes through the seventeenth reflection The surface is turned downward, and then converged by the Fresnel condenser lens at the second through hole position of the lower fixed shell, and then concentrated to the light receiving device of the PCB board, thereby triggering the conduction of the circuit; When the key release spring returns to the original position, the sixteenth reflective surface located under the keycap is completely staggered from the seventeenth reflective surface located on the upper fixed shell, the optical path is cut off, and the connected circuit is disconnected. 17. The switch module of an ultra-thin reflective computer input device according to claim 16, characterized in that, the fourteenth reflective surface located under the keycap and the fourteenth reflective surface located on the upper fixed shell The seventeenth reflective surface is an inclined plane, and may also be an off-axis paraboloid, an off-axis quadratic surface, or a free-form surface of a polynomial surface, or a composite surface composed of multiple surfaces. 18. The switch module of an ultra-thin reflective computer input device according to claim 2, wherein the optical path channel includes an eighteenth reflective surface located under the keycap, and an eighteenth reflective surface located under the lower fixing shell. the first refracting prism at the position of the second through hole, The light emitted from the light-emitting device is collimated and incident on the eighteenth reflective surface under the keycap after passing through the first through hole on the lower fixed shell. When the key is pressed down, the eighteenth reflection surface under the keycap will The surface is just aligned with the first refracting prism located at the second through hole of the lower fixed shell, which collimates or partially collimates the light emitted from the light-emitting device and then refracts it before emitting it, and the emitted light passes through the first refraction prism The prism performs total reflection and convergence, and turns downward, and the refracted light is projected to the light receiving device of the PCB board, thereby triggering the conduction of the circuit; When the key release spring returns to its original position, the eighteenth reflective surface located under the keycap is completely staggered from the first refracting prism located at the second through hole of the lower fixed shell, the optical path is cut off, and the connected circuit is disconnected. 19. The switch module of an ultra-thin reflective computer input device according to claim 18, wherein the eighteenth reflective surface located under the keycap is an off-axis paraboloid, and off-axis twice Curved surfaces or free-form surfaces of polynomial surfaces, which can also be inclined pure planes, or composite surfaces composed of multiple surfaces; The first refracting prism located at the position of the second through hole of the lower fixed shell has a vertical plane near the eighteenth reflective surface, which is the input surface; and an inclined free-form surface on the side away from the eighteenth reflective surface The total reflection surface can be an off-axis paraboloid, an off-axis quadratic surface, or a polynomial surface, it can also be an inclined pure plane, or a composite surface composed of multiple surfaces; there is a horizontal light-transmitting plane below it, which is output face. 20. The switch module of an ultra-thin reflective computer input device according to claim 2, wherein the optical path channel includes a first light blocking sheet located under the keycap, a second light blocking sheet located at the lower fixed shell, A second refracting prism at the position of a through hole and a third refracting prism at the position of the second through hole of the lower fixed shell, the second and third refracting prisms both have reflective curved surfaces for light refraction; The second refracting prism and the third refracting prism are aligned with each other. When the button is released, the light emitted by the light-emitting device passes through the Fresnel surface below the second refracting prism, and then collimates and enters the said third refracting prism. The inclined total reflection surface above the second refraction prism is output from the vertical plane on the right side of the second refraction prism after being deflected by the total reflection surface, and the output light is incident on the third refraction prism on the other side, and passes through the second refraction prism. After the inclined total reflection surface above it is turned, it converges to the light-receiving device of the PCB board through the Fresnel surface below it, thereby triggering the conduction of the circuit; When the button is pressed down, the first light-blocking sheet located under the keycap moves downward, which completely blocks the light between the second refracting prism and the third refracting prism, the light path is cut off, and the connected circuit is in Disconnected state. 21. The switch module of an ultra-thin reflective computer input device according to claim 20, characterized in that, Above the second refracting prism and the third refracting prism is an off-axis paraboloid, an off-axis quadratic surface or a free-form surface of a polynomial surface, which can also be an inclined pure plane, or a composite surface composed of multiple surfaces , all beneath which are Fresnel surfaces. 22. The switch module of an ultra-thin reflective computer input device according to claim 2, wherein the optical path channel includes a second light-blocking sheet located under the keycap, located on the upper fixed shell The nineteenth reflective surface of , and the twentieth reflective surface also located on the upper fixed shell, The nineteenth reflective surface and the twentieth reflective surface are aligned with each other, and when the button is released, the light emitted by the light-emitting device passes through the nineteenth reflection on the upper fixed shell for collimating and turning the light path After surface reflection, the collimated emitted light turns downward through the twentieth reflective surface, and then converges on the light-receiving device of the PCB board through the second through hole of the lower fixed shell, thereby triggering the conduction of the circuit; when the button is pressed When pressing, the second light-blocking sheet located under the keycap moves downwards, which completely blocks the light between the nineteenth reflective surface and the twentieth reflective surface, the light path is cut off, and the connected circuit is in disconnection. open state. 23. The switch module of an ultra-thin reflective computer input device according to claim 22, characterized in that, The nineteenth reflective surface and the twentieth reflective surface are off-axis paraboloids, off-axis quadratic surfaces, or free-form surfaces of polynomial surfaces, which may also be inclined pure planes, or compound curved surfaces composed of multiple surfaces. 24. The switch module of an ultra-thin reflective computer input device according to claim 2, wherein the optical path channel includes a third light blocking sheet located under the keycap, and a second light blocking sheet located at the lower fixed shell. A fourth refracting prism at the position of a through hole for turning the light path, and a twenty-first reflective surface on the upper fixed shell for turning the light path, The fourth refracting prism is aligned with the twenty-first reflective surface, when the button is released, the light emitted by the light emitting device is reflected by the total reflection surface of the fourth refracting prism, and the emitted light is refracted Then turn down through the twenty-first reflective surface, and then converge on the light receiving device of the PCB board through the second through hole of the lower fixed shell, thereby triggering the circuit to be turned on; When the key is pressed down, the third light-blocking sheet located under the keycap moves downward, which completely blocks the light between the fourth refracting prism and the twenty-first reflective surface, the light path is cut off, and the connected The circuit is open. 25. The switch module of an ultra-thin reflective computer input device according to claim 24, characterized in that, Above the third refracting prism is a total reflection surface in the form of an inclined curved surface, which is an off-axis paraboloid, off-axis quadratic surface, or polynomial curved surface, which can also be an inclined pure plane, or a composite of multiple surfaces. A curved surface with a Fresnel surface underneath; The twenty-first reflective surface is an off-axis paraboloid, an off-axis quadratic surface, or a free-form surface of a polynomial surface, and it can also be an inclined pure plane, or a compound curved surface composed of multiple surfaces. 26. The switch module of an ultra-thin reflective computer input device according to claim 2, wherein the optical path channel includes a fourth light blocking sheet located under the keycap, located on the lower fixed shell The fifth refracting prism at the position of the first through hole for collimating and turning the light path, and the sixth refracting prism also at the position of the second through hole on the lower fixed shell for turning the light path, The fifth refracting prism and the sixth refracting prism are aligned with each other. When the button is released, the light emitted by the light emitting device is reflected by the total reflection surface of the fifth refracting prism, and the collimated emitted light is again Reflecting and turning downwards through the total reflection surface of the sixth refracting prism, converging on the light receiving device of the PCB board, thereby triggering the conduction of the circuit; When the key is pressed down, the fourth light-blocking sheet located under the keycap moves downward, which completely blocks the light between the fifth refracting prism and the sixth refracting prism, the light path is cut off, and the connected circuit is in Disconnected state. 27. The switch module of an ultra-thin reflective computer input device according to claim 26, characterized in that, The top of the fifth and sixth refracting prisms is a total reflection surface in the form of an inclined curved surface, which is an off-axis paraboloid, an off-axis quadric surface, or a polynomial curved surface, which can also be an inclined pure plane, or a plurality of surfaces Composed of compound curved surfaces; the bottom of the fifth and sixth refracting prisms are all Fresnel surfaces. 28. The switch module of an ultra-thin reflective computer input device according to claim 2, wherein the optical path channel includes a twenty-second reflective surface and a twenty-third reflective surface located below the keycap. A reflective surface, a collimating Fresnel lens located at the position of the first through hole of the lower fixed housing, a concentrating Fresnel lens located at the position of the second through hole of the lower fixed housing, and a fifth light blocking sheet located on the PCB , The twenty-second reflective surface and the twenty-third reflective surface are aligned with each other. When the key is released, the light emitted by the light-emitting device is collimated by the collimating Fresnel lens on the lower fixed shell. Incident to the twenty-second reflective surface located under the keycap, after reflection, the light is turned, and then incident on the other side, the twenty-third reflective surface also located under the keycap, after being reflected again, The light is incident downward into the concentrating Fresnel lens located in the lower fixed shell, and converges on the light receiving device of the PCB board, thereby triggering the conduction of the circuit; When the button is pressed down, the fifth light-blocking sheet located on the PCB completely blocks the light between the twenty-second reflective surface and the twenty-third reflective surface, the light path is cut off, and the connected circuit is disconnected. open state. 29. The switch module of an ultra-thin reflective computer input device according to claim 28, wherein the twenty-second reflective surface and the twenty-third reflective surface are both inclined planes, and It can also be an off-axis paraboloid, an off-axis quadratic surface, or a free-form surface of a polynomial surface, or a compound surface composed of multiple surfaces. 30. The switch module of an ultra-thin reflective computer input device according to claim 2, wherein the optical path channel includes a first right-angle prism and a second right-angle prism located under the keycap, The collimating Fresnel lens at the position of the first through hole of the lower fixed shell, the concentrating Fresnel lens at the position of the second through hole of the lower fixed shell, and the sixth light blocking sheet on the PCB, The first right-angle prism and the second right-angle prism are aligned with each other. When the key is released, the light emitted by the light-emitting device is collimated by the collimating Fresnel lens on the lower fixed shell, and then incident on the button located on the key. The first right-angle prism under the cap, after being reflected by the reflective surface above it, the light turns and enters the second right-angle prism on the other side, which is also located under the keycap, and after being reflected again by the reflective surface above it, The light is incident downward into the concentrating Fresnel lens located in the lower fixed shell, and converges on the light receiving device of the PCB board, thereby triggering the conduction of the circuit; When the button is pressed down, the sixth light blocking sheet located on the PCB completely blocks the light between the first right-angle prism and the second right-angle prism, the light path is cut off, and the connected circuit is in a disconnected state. 31. The switch module of an ultra-thin reflective computer input device according to claim 30, wherein the reflective surfaces above the first right-angle prism and the second right-angle prism are total reflection Surfaces, all of which are inclined planes, can also be off-axis paraboloids, off-axis quadratic surfaces or free-form surfaces of polynomial surfaces, or composite surfaces composed of multiple surfaces. 32. The switch module of an ultra-thin reflective computer input device according to claim 2, wherein the optical path channel includes a twenty-fourth reflective surface and a twenty-fifth reflective surface located below the keycap. the reflective surface, and the seventh light-blocking sheet located on the PCB, The twenty-fourth reflective surface and the twenty-fifth reflective surface are aligned with each other. When the key is released, the light emitted by the light-emitting device enters the keycap below the keycap through the first through hole on the lower fixed shell. The said twenty-fourth reflective surface, after being reflected, the light is projected to the other side, the twenty-fifth reflective surface which is also located under the keycap, and after being reflected again, the light turns downward and passes through the lower fixed shell The second through hole on the PCB converges to the light-receiving device on the PCB board, thereby triggering the conduction of the circuit; When the button is pressed down, the seventh light-blocking sheet located on the PCB completely blocks the light between the twenty-fourth reflective surface and the twenty-fifth reflective surface, the light path is cut off, and the connected circuit is disconnected. open state. 33. The switch module of an ultra-thin reflective computer input device according to claim 32, wherein the twenty-fourth reflective surface and the twenty-fifth reflective surface are off-axis A free-form surface of a paraboloid, an off-axis quadratic surface, or a polynomial surface, which can also be an inclined pure plane, or a compound surface composed of multiple surfaces. 34. The switch module of an ultra-thin reflective computer input device according to claim 1, wherein the light-emitting device is vertically arranged on the upper fixed shell, and the light-receiving device It is arranged on the PCB board, the lower fixing shell is provided with a second through hole, and the second through hole is located above the light receiving device. 35. The switch module of an ultra-thin reflective computer input device according to claim 34, wherein the optical path channel includes a collimating Fresnel lens arranged on the upper fixed shell, located on the key shaft The twenty-sixth reflective surface and the twenty-seventh reflective surface located under the upper fixed shell, The light emitted from the light-emitting device is collimated and incident on the twenty-sixth reflective surface of the key shaft after passing through the collimating Fresnel lens on the upper fixed shell. The twenty-sixth reflective surface is just aligned with the twenty-seventh reflective surface under the upper fixed shell, which turns and refracts the incident light from the twenty-sixth reflective surface, and the emitted light passes through the second fixed shell. The back of the through hole position is concentrated to the light receiving device of the PCB board, thereby triggering the conduction of the circuit; When the button is released and the spring returns to the original position, the twenty-sixth reflective surface is completely staggered from the twenty-seventh reflective surface, the optical path is cut off, and the connected circuit is in a disconnected state. 36. The switch module of an ultra-thin reflective computer input device according to claim 35, wherein the twenty-seventh reflective surface is an off-axis paraboloid, an off-axis quadratic curved surface or a polynomial curved surface It can also be an inclined pure plane, or a compound surface composed of multiple surfaces. 37. The switch module of an ultra-thin reflective computer input device according to claim 34, wherein the optical path channel includes a collimating Fresnel lens arranged on the upper fixed shell, located on the keycap The eighth light blocking sheet below, and the seventh refracting prism located at the second through hole of the lower fixed shell, The collimating Fresnel lens and the seventh refracting prism arranged on the upper fixed shell are aligned with each other, and when the button is released, the light emitted by the light-emitting device is collimated and emitted through the collimating Fresnel lens , the light is incident on the seventh refracting prism at the position of the second through hole of the lower fixed shell on the other side, after being refracted by the inclined total reflection surface above it, it passes through the condensing phenanthrene below the seventh refracting prism The Neel plane converges to the light-receiving device of the PCB board, thereby triggering the conduction of the circuit; When the button is pressed down, the eighth light blocking sheet located under the keycap completely blocks the light between the collimating Fresnel lens and the seventh refracting prism, the light path is cut off, and the connected circuit is in a disconnected state . 38. The switch module of an ultra-thin reflective computer input device according to claim 37, wherein the top of the seventh refracting prism is an inclined reflective surface, and the reflective surface is off-axis A free-form surface in the form of a paraboloid, an off-axis quadratic surface, or a polynomial surface can also be an inclined pure plane, or a compound surface composed of multiple surfaces, and the light-condensing Fresnel surface is below the seventh refracting prism. 39. The switch module of an ultra-thin reflective computer input device according to claim 34, wherein the optical path channel includes a collimating Fresnel lens arranged on the upper fixed shell, located on the keycap The ninth light blocking sheet below and the twenty-eighth reflective surface located on the upper fixed shell, The collimating Fresnel lens and the twenty-eighth reflective surface arranged on the upper fixed shell are aligned with each other. Directly emitted, the light is incident on the twenty-eighth reflective surface located on the upper fixed shell on the other side, after being reflected and turned, it converges on the light receiving device of the PCB board through the second through hole located on the lower fixed shell, thereby The trigger circuit is turned on; When the button is pressed down, the ninth light blocking sheet located under the keycap completely blocks the light between the collimating Fresnel lens and the twenty-eighth reflective surface, the light path is cut off, and the connected circuit is in an off state. open state. 40. The switch module of an ultra-thin reflective computer input device according to claim 39, wherein the twenty-eighth reflective surface is an off-axis paraboloid, an off-axis quadratic curved surface or a polynomial curved surface It can also be an inclined pure plane, or a compound surface composed of multiple surfaces. 41. The switch module of an ultra-thin reflective computer input device according to claim 34, wherein the optical path channel includes a collimating Fresnel lens arranged on the upper fixed shell, located on the keycap The tenth light blocking sheet below, and the eighth refracting prism located at the second through hole of the lower fixed shell, The collimating Fresnel lens and the eighth refracting prism arranged on the upper fixed shell are aligned with each other. When the button is released, the light emitted by the light emitting device is collimated and emitted through the collimating Fresnel lens. , the light is incident on the eighth refracting prism on the other side at the position of the second through hole of the lower fixed shell, after being turned by the inclined total reflection surface above it, and then converged to the PCB board through the light-transmitting plane below it on the light receiving device, thereby triggering the circuit conduction; When the key is pressed down, the tenth light blocking sheet located under the keycap completely blocks the light between the collimating Fresnel lens and the eighth refracting prism, the light path is cut off, and the connected circuit is in a disconnected state . 42. The switch module of an ultra-thin reflective computer input device according to claim 41, wherein the top of the eighth refracting prism is an inclined reflective surface, and the reflective surface is off-axis A free-form surface in the form of a paraboloid, an off-axis quadratic surface, or a polynomial surface can also be an inclined pure plane, or a composite curved surface composed of multiple surfaces, and the light-transmitting plane is below the eighth refracting prism. 43. The switch module of an ultra-thin reflective computer input device according to claim 1, wherein the light receiving device is vertically arranged on the upper fixed shell, and the light emitting device Set on the PCB board, the lower fixing shell is provided with a first through hole, and the first through hole is located above the light emitting device. 44. The switch module of an ultra-thin reflective computer input device according to claim 43, wherein the optical path channel includes a twenty-ninth reflective surface arranged under the upper fixed shell, located at the key The thirtieth reflective surface on the shaft, the thirty-first reflective surface on the other side of the key shaft, and the concentrating Fresnel lens on the upper fixed shell, The light emitted from the light-emitting device is collimated and incident on the twenty-ninth reflective surface below the upper fixed shell after passing through the first through hole on the lower fixed shell. When the key is pressed down, the first through hole on the key shaft The thirtieth reflective surface is just aligned with the twenty-ninth reflective surface below the upper fixed shell, and it turns and refracts the incident light from the twenty-ninth reflective surface, and then enters another light that is also located on the key shaft. The thirty-first reflective surface on one side, after being reflected and turned again, is incident on the light-condensing Fresnel lens located on the other side of the upper fixed shell and then concentrated to the light receiving device of the upper fixed shell, thereby triggering the circuit conductor Pass; When the button is released and the spring returns to its original position, the thirtieth reflective surface is completely staggered from the twenty-ninth reflective surface, and the thirty-first reflective surface is also completely staggered from the condensing Fresnel lens , the optical path is cut off, and the connected circuit is disconnected. 45. The switch module of an ultra-thin reflective computer input device according to claim 44, wherein the twenty-ninth reflective surface is an off-axis paraboloid, an off-axis quadric surface, or A free-form surface in the form of a polynomial surface, which can also be an inclined pure plane, or a compound surface composed of multiple surfaces. 46. The switch module of an ultra-thin reflective computer input device according to claim 43, wherein the optical path channel includes the eleventh light-blocking sheet located under the keycap, the The ninth refracting prism on the fixed shell, and the concentrating Fresnel lens on the upper fixed shell on the other side of the eleventh light blocking sheet, The ninth refracting prism is aligned with the condensing Fresnel lens arranged on the upper fixed shell, and when the button is released, the light emitted from the light emitting device is aligned after passing through the first through hole on the lower fixed shell. It is directly incident on the ninth refracting prism, and after being collimated and deflected, it is incident on the other side and is located in the concentrating Fresnel lens of the upper fixed shell, and then converges to the light receiving device of the upper fixed shell, thereby The trigger circuit is turned on; When the button is pressed down, the eleventh light-blocking sheet located under the keycap completely blocks the light between the collimating Fresnel lens and the ninth refracting prism, the light path is cut off, and the connected circuit is in Disconnected state. 47. The switch module of an ultra-thin reflective computer input device according to claim 46, wherein the upper part of the ninth refracting prism is an inclined reflective surface, and the reflective surface is off-axis A free-form surface in the form of a paraboloid, an off-axis quadratic surface, or a polynomial surface can also be an inclined pure plane, or a composite curved surface composed of multiple surfaces, and the light-transmitting plane is below the ninth refracting prism. 48. The switch module of an ultra-thin reflective computer input device according to claim 1, wherein the light-receiving device is vertically arranged on the keycap, and the light-emitting device is arranged On the PCB board, a first through hole is arranged on the lower fixing shell, and the first through hole is located above the light receiving device. 49. The switch module of an ultra-thin reflective computer input device according to claim 48, wherein the optical path channel includes a collimated Fresnel located at the position of the first through hole of the lower fixed shell a lens, a twelfth light-blocking sheet fixed on the PCB, a thirty-second reflective surface fixed under the keycap and located on both sides of the twelfth light-blocking sheet, and a concentrating Fresnel lens, The thirty-second reflective surface is aligned with the condensing Fresnel lens fixed below the key cap, and when the key is released, the light emitted from the light-emitting device passes through the position of the first through hole of the lower fixed shell The collimated Fresnel lens is collimated and incident on the thirty-second reflective surface, after being deflected, it is incident on the other side of the concentrating Fresnel lens fixed under the keycap, and then converges To the light-receiving device that is also fixed under the keycap, so as to trigger the conduction of the circuit; When the button is pressed down, the twelfth light-blocking sheet fixed on the PCB completely blocks the light between the condensing Fresnel lens and the thirty-second reflective surface, and the light path is cut off and connected circuit is disconnected. 50. The switch module of an ultra-thin reflective computer input device according to claim 49, wherein the light-condensing Fresnel lens and the light-receiving device are fixed on the Below the keycaps. 51. The switch module of an ultra-thin reflective computer input device according to claim 49, wherein the thirty-second reflective surface is an inclined plane. 52. The switch module of an ultra-thin reflective computer input device according to claim 48, wherein the optical path channel includes a collimated Fresnel located at the position of the first through hole of the lower fixed shell a lens, a thirteenth light-blocking sheet fixed on the PCB, a third right-angle prism fixed under the keycap and located on both sides of the twelfth light-blocking sheet, and a concentrating Fresnel lens, The third right-angle prism is aligned with the condensing Fresnel lens fixed below the keycap, and when the key is released, the light emitted from the light-emitting device passes through the collimator at the position of the first through hole of the lower fixed shell. After the straight Fresnel lens is collimated and incident on the third right-angle prism, after being emitted and deflected by the reflective surface of its inclined plane, it is incident on the other side of the concentrating Fresnel lens fixed under the keycap, Then converge to the light-receiving device that is also fixed under the keycap, thereby triggering the conduction of the circuit; When the button is pressed down, the thirteenth light-blocking sheet fixed on the PCB completely blocks the light between the condensing Fresnel lens and the third right-angle prism, the light path is cut off, and the connected circuit is disconnected. 53. The switch module of an ultra-thin reflective computer input device according to claim 52, characterized in that the light-condensing Fresnel lens, the light-receiving device and the third right-angle prism They are all fixed under the keycaps by means of buckles. 54. The switch module of an ultra-thin reflective computer input device according to claim 52, wherein the upper part of the third rectangular prism is a reflective surface of an inclined plane. 55. A switch module for an ultra-thin reflective computer input device according to any one of claims 1 to 54, wherein the reflective surface is a high reflectivity surface, and its reflection coefficient exceeds 80%. It is bright silver or bright gold, and it can also be high-reflectivity white or light-reflective coating. 56. A switch module of an ultra-thin reflective computer input device according to any one of claims 1 to 54, wherein the light emitting device is an SMD IR infrared diode or a laser diode, and the light The receiving device is a SMD PT tube. 57. A switch module for an ultra-thin reflective computer input device according to any one of claims 20 to 54, wherein the light blocking sheet is made of a black light-absorbing material, and it is compatible with the keycap The two-color injection molding method is used for injection molding or combined together by a buckle, or arranged above the PCB board by a buckle. 58. A keycap character lighting system, used in conjunction with a switch module of an ultra-thin reflective computer input device according to any one of claims 1 to 54, characterized in that the keycap character lighting system includes : the lighting source arranged on the PCB board and the optical device for light distribution on the upper fixed shell, wherein the lighting source is a single-color LED chip or a multi-color LED chip, and the optical device is a trapezoidal reflection Reflectors, square reflectors, polarizing lenses, total reflection lenses, combined lenses or diffusion sheets doped with diffusion particles inside for light mixing. 59. A keycap character lighting system according to claim 58, wherein the optical device is a trapezoidal reflector or a square reflector, which distributes the light emitted by the lighting source to the For the required lighting range, the reflective surface is a high-reflectance surface with a reflectance over 80%, and it is bright silver or bright gold, or it can be a high-reflectance white or light-reflecting coating. 60. The lighting system for keycap characters according to claim 58, wherein the optical device is an eccentric lens, and its upper curved surface is an eccentric and asymmetric free-form surface. 61. The keycap character illumination system according to claim 58, wherein the optical device is a total reflection lens, which includes a middle refraction part and an outer total reflection part. 62. A keycap character lighting system according to claim 58, characterized in that, the optical device is a combined lens, the lower surface of which is a zigzag Fresnel surface, which can collect light at a large angle and perform Collimated, collimated and then incident on its upper surface, the upper surface is convex, used to distribute the collimated incident light from the lower surface to the required lighting area. 63. A lighting system for keycap characters according to claim 58, wherein the lighting source is a multi-color LED chip, and the optical device is an diffuser doped with diffusion particles inside for light mixing treatment. Scattered slices.