CN201007821Y - Optical Structure of Optical Mouse - Google Patents

Abstract

The utility model relates to an optical mouse's optical structure contains: a light emitter for providing a projected light beam; a lens unit, a light-gathering surface is formed on the bottom surface of the lens unit and is just positioned on the projection path of the light beam for adjusting the slope of the light beam, the normal of the light-gathering surface of the lens unit is vertical to the target surface, so that the light beam is focused at the bottom end of the lens unit and then is transmitted to the target surface, and the image capturing path just passes through the lens unit from the target surface and enters the upper end of the lens unit; the optical sensing unit is relatively positioned at the upper end of the lens unit and is used for capturing an image of the surface of the target; with the structure, the light beam is focused on the target surface through the lens unit, the image of the target surface is clearly read by the light sensing unit, and the displacement direction and the displacement distance data of the input device body on the target surface are correspondingly judged according to the image change of the target surface during moving.

Description

Optical Structure of Optical Mouse

technical field

The utility model relates to an optical structure of an optical mouse, in particular to a lens that is arranged between a luminous body and a target surface. When a light beam passes through the lens, a refraction phenomenon occurs, and then the projection path is adjusted so that the light beam of the luminous body is directed toward the mouse. The lower focus is on the target surface, so that the light sensing unit can clearly detect the image on the target surface.

Background technique

With the advancement and development of science and technology, computers have become an indispensable part of human life, and input devices are necessary interface equipment for computers. In order to cooperate with the ever-changing functions of computers, input devices (such as: mouse, keyboard, etc. etc.) are constantly being updated and developed in order to be more practical. Taking the mouse and keyboard as an example, except for a large amount of text input, the frequency of use of the mouse is more than that of the keyboard. Because the mouse has excellent freedom and controllability, It can assist and replace the bulky keyboard, especially for the manipulation of multimedia and Internet, and the mouse has an irreplaceable position.

The types of mice currently on the market can be roughly divided into mechanical mice and optical mice. Although the technical threshold of mechanical mice is low and the price is cheap, the disadvantage is that the trackball is easy to wear and absorb dust during the rolling process, causing Mechanical mouse accuracy decreased.

The technical principle of the optical mouse is to use a luminous body (usually a red luminous body) to irradiate light onto the target surface, and capture the reflected beam back within a certain period of time. , you can calculate the direction of the mouse movement and determine how far the mouse has moved.

For the existing optical mouse on the market, please refer to Fig. 1, there is a sectional view of an existing optical mouse, the mouse moves on a plane, when the light-emitting element a is activated to project the luminous body to the first reflective surface b1 of the light guide plate b, That is, the illuminant will be reflected onto the second reflective surface b2, and through the reflection of the second reflective surface b2, the illuminant will pass through the opening of the base c and be projected on the target surface d formed by a non-transparent interface. When the target surface d When it is a non-transparent interface, the target surface d overlaps with the first image axis I, so that the image capture element e can just capture the image on the first image axis I of the object projected by the illuminant on the target surface d, so that the image capture element e can continuously capture correct images, and then accurately calculate the moving distance and direction of the mouse through the circuit control unit (not shown in the figure).

According to the above, the image capture structure of the optical mouse needs to make the projected light beam D and the light beam R of the captured image intersect at a point on the first image axis I of the target surface d, so that the image capture element e can be correct. The image signal of the first image axis I is captured.

However, as shown in Figure 2, if the target surface d is made of a transparent medium material (such as: glass), since the target surface d does not overlap with the first image axis I, when the projection light is incident on the target surface d, if the When entering the refractive index, the projected light beam D will transmit the intersection point of the target surface d and the second image axis I1 below it, that is, the projected light beam D and the captured image light beam R cannot intersect on the first image axis I, so As a result, the optical mouse cannot function on the target surface d, in other words, the optical mouse will lose its function on the transparent medium layer.

In order to improve the above problems, another existing optical mouse is currently produced in the industry. Please refer to Figure 3. It can be seen from the figure that when the mouse moves on a plane, the light beam D projected through the light-emitting element a is transmitted to When the first reflective surface b1 of the light guide plate b, the projected light beam D will be reflected to the surface of a beam splitter f (beam splitter) along the vertical direction, and the beam splitter f is a part of the projected light beam D An optical object that reflects while another part transmits. Reflected by the beam splitter f, the projected light beam D is vertically transmitted downward to the target surface d below a transparent medium layer (glass), so that the target surface d reflects a captured image beam R to the inner surface of the beam splitter f , so that the captured image beam R overlaps with the projected beam D reflected by the beam splitter f, and intersects the second image axis I1 of the target surface d below the transparent medium layer. The light beam R of the captured image is reflected by the beam splitter f to a lens for an image capture element e to capture the image through the lens.

However, when the above-mentioned structure is actually used, since the luminous body signal projected by the light-emitting element a has to be reflected by the light guide plate b, and then passed through the spectroscopic mirror f, it can be transmitted to the target surface d, especially during the spectroscopic process, Most of the light energy has been lost through the transmission of the beam splitter f, which relatively makes the effective use of light energy relatively low. In particular, in order to make the light beam passing through the transparent medium layer reach the target surface d to achieve an image sufficient for the target surface d, the luminous power of the light-emitting element a must be increased, which will relatively consume light energy. In today's energy shortage, It is an extremely environmentally friendly and uneconomical design.

Contents of the invention

The main purpose of the utility model is to overcome the deficiencies and defects of the prior art, and propose an optical structure of an optical mouse. A lens unit is arranged between the luminous body and the target surface, so that when the light beam passes through the lens unit, refraction occurs, and then The projection path is adjusted so that the light beam of the illuminant is concentrated on the target surface, so that the light sensing unit can clearly detect the image on the target surface.

In order to achieve the above object, the utility model provides an optical structure of an optical mouse, which includes: a luminous body, which provides a projected beam; On the path, and the normal of the light-concentrating surface of the lens unit is perpendicular to the target surface, so that the light beam is focused on the bottom of the lens unit, and then transmitted to the target surface, and the image capture path just passes through the lens unit from the target surface, and the beam gathers on the upper end of the lens unit; and a light sensing unit relatively located on the upper end of the lens unit for capturing images of the target surface.

With the above structure, the beneficial effect of the present invention is that the light beam is focused on the target surface through the light-gathering surface of the lens unit, so that the light sensing unit can clearly read the image of the target surface, and respond according to the image change of the target surface when moving. Judging the displacement direction and displacement distance data of the input device body on the target surface.

In order to further understand the features and technical contents of the present utility model, please refer to the following detailed description and accompanying drawings of the present utility model. However, the attached drawings are only for reference and illustration, and are not intended to limit the present utility model.

Description of drawings

1 is a schematic cross-sectional view of an existing optical structure;

Fig. 2 is the schematic diagram of the embodiment of existing optical structure;

3 is a schematic cross-sectional view of another existing optical structure;

Fig. 4 is the schematic diagram of the beam path of the utility model beam passing through the lens unit;

Fig. 4A is a schematic diagram of the light beam path of the utility model light beam entering the transparent medium layer through the lens unit;

5 is a schematic cross-sectional view of a second embodiment of the present invention;

6 is a schematic cross-sectional view of a third embodiment of the present invention;

7 is a schematic cross-sectional view of a fourth embodiment of the utility model;

Fig. 8 is a schematic cross-sectional view of a fifth embodiment of the present invention.

Explanation of symbols in the figure

current technology

a light emitting element

b light guide plate

b1 first reflective surface

b2 second reflective surface

c base

d target surface

e image capture component

f beam splitter

R The light beam that captures the image

D projected beam

I First Image Axis

I1 second image axis

The utility model

1 luminous body

2 base body

21 spaces

22 lens unit

221 Concentrating surface

222 light guide prism

24 condenser lens

25 light guide mirror

3 light sensing unit

4 Target surface

5 transparent medium layer

L1 beam incident path

L2 image capture path

A First image axis

B Second image axis

Detailed ways

First, please refer to FIG. 4, the utility model is located in the input device body, which includes: a luminous body 1, a lens unit 22 and a light sensing unit 3; wherein,

The luminous body 1 can be a visible luminous body 1 or an invisible luminous body 1, and the specific structure of the luminous body 1 adopts a laser or a light-emitting diode, which is mainly used to provide a projected light beam, and the projection direction of the luminous body is horizontal direction projection.

The lens unit 22 corresponds to the light beam incident path L1 and the image capture path L2 of the illuminant 1, and the lens unit 22 is a convex lens, and a converging surface 221 is formed on the bottom surface of the lens unit 22 just on the light beam incident path L1 , used to adjust the slope of the light beam, a light guide prism 222 is respectively formed on the top of the lens unit 22 opposite to the upper side of the light-concentrating surface 221 on the light beam incident path L1 of the light beam emitted by the illuminant, for guiding the light beam Reflected into the converging surface 221 of the lens unit 22, the light beam is focused on the bottom of the lens unit 22, i.e. the target surface 4, and the normal of the lens unit 22 is perpendicular to the target surface 4, so that the image of the target surface 4 along the image The capture path L2 passes through the lens unit 22 , and the beam is collected at the upper end of the lens unit 22 .

The light sensing unit 3 is mounted on the upper end of the above-mentioned lens unit 22 for capturing the image from the image capturing path L2 of the target surface 4 .

When the above structure is implemented, as shown in FIG. 4A , the light guide prism 222 arranged around the lens unit 22 is located on the light beam incident path L1, so that the light beam incident path L1 of the illuminant 1 can pass through the light guide prism 222 The guide enters the light-concentrating surface 221 of the lens unit 22 through one or more reflections, so as to achieve the function of guiding the light beam on the light-concentrating surface 221, and then make the incident path of the light beam pass through the light-concentrating surface 221 of the lens unit 22 The light beam on the L1 produces the refraction phenomenon focused toward the center, and concentrates on the target surface 4 below a transparent medium layer 5 (glass), so that the light beam can be concentrated and penetrate the first transparent medium layer 5 (glass) surface. An image axis A is projected into the second image axis B of the target surface 4 below, so that the image of the target surface 4 penetrates the transparent medium layer 5 along the image capture path L2, passes through the lens unit 22, and then enters the The light sensing unit 3 enables the light sensing unit 3 to clearly read the image of the target surface 4, and then through the circuit control unit, according to the change of the image of the target surface 4 during movement, the displacement direction and displacement of the input device body on the target surface 4 are correspondingly judged distance data.

In the second embodiment of the present invention, as shown in FIG. 5 , in the above-mentioned structure, the luminous body 1 can be arranged in a vertical direction, so that the light beam incident path L1 of the light beam projected by the luminous body 1 cannot directly enter the lens unit 22. A plurality of light guide prisms 222 are arranged around the light collecting surface 221 through the lens unit 22 at this time, at least one of the light guide prisms 222 is located on the light beam incident path L1, and at least two of the light guide prisms reflect each other. The light beam is transmitted through the reflection and transmission of the plurality of light guide prisms 222 , and enters the light collecting surface 221 of the lens unit 22 .

According to the above structure, the light beam of the illuminant 1 first enters the light guide prism 222 located below the illuminant 1, so that the light beam incident path L1 of the illuminant 1 can be guided through the light guide prism 222 and horizontally reflected into the other light-guiding prism 222, so that the light beam incident path L1 can be guided through the other light-guiding prism 222, and perpendicularly enters the light-condensing surface 221 of the lens unit 22, so as to guide the light beam on the light-condensing surface Function on the glossy surface 221 .

In the third embodiment of the present invention, as shown in FIG. 6 , in the above structure, the illuminant 1 and the lens unit 22 are accommodated in a base body 2 . The base body 2 is integrally formed of a transparent material, and a space 21 is provided on the light beam incident path L1 and the light beam reflection path L2 of the illuminant 1 , and the lens unit 22 is set in the space 21 .

In the fourth embodiment of the present utility model, as shown in FIG. 7, in the above-mentioned structure, in the base body 2, at least one The condensing lens 24 with the effect of adjusting the image is used to adjust the definition of the image so that the light sensing unit 3 can obtain better image capture.

According to the above structure, the image of the target surface 4 is further adjusted through the condenser lens 24 arranged on the image capturing path L2, and then injected into the light sensing unit 3, so that the light sensing unit 3 can capture The captured image is brighter and clearer.

In the fifth embodiment of the present utility model, as shown in FIG. 8 , in the above structure, at least one light guide mirror 25 is provided between the light sensing unit 3 and the lens unit 22 above the space 21 of the base body 2 Just located on the image capturing path L2 for guiding the image to the photo-sensing unit 3 .

As described above, the light sensing unit 3 does not have to be located on the same normal line as the light-collecting surface 221 of the lens unit 22, but the image capture path L2 can be changed through the light guide mirror 25, so that the image capture path L2 is correspondingly incident on the light sensing unit 3 .

In summary, the utility model has the following advantages:

1. The utility model uses the focusing surface 221 of the lens unit 22 to produce beam focus on the incoming light beam, so that the light beam incident path L1 can adjust the beam set, and can penetrate through the transparent medium layer 5 (glass) directly below The surface is projected onto the target surface 4 below the transparent medium layer 5, so that the image of the target surface 4 can be captured clearly.

2. The utility model focuses the light beam through the concentrating surface 221, thereby reducing the energy consumption of the light beam, so that the luminous body 1 with equal luminous power can exert the maximum beam intensity in this structure, and make the target surface 4 images can be captured clearly, thereby relatively saving optical power output and making full use of light energy. In today's energy shortage, it is an environmentally friendly and economical design.

3. The light beam of the present invention enters the target surface 4 and is concentrated and surrounded, and the normal line of the lens unit 22 is perpendicular to the target surface 4, so the light beam incident path L1 and the image capture path L2 nearly overlap, thereby preventing the light beam from passing through the transparent Due to the physical influence of refraction caused by the dielectric layer 5, the image of the target surface 4 can be captured smoothly and clearly.

The above descriptions are only preferred feasible embodiments of the present utility model, and are not intended to limit the patent scope of the present utility model. Therefore, all equivalent technical changes made by using the description of the utility model and the contents of the accompanying drawings are included in the utility model. In the range.

Claims (15)

1. An optical structure of an optical mouse is arranged in an input device body, and is characterized by comprising:

a light emitter providing a projected light beam;

a lens unit, the bottom surface of which is formed with a light-gathering surface for adjusting the slope of the light beam, the light-gathering surface is just positioned on the projection path of the light beam, so that the light beam is focused at the bottom end of the lens unit and then transmitted to the target surface, and the image capturing path just passes through the lens unit from the target surface, and the light beam is gathered at the upper end of the lens unit;

and the light sensing unit is relatively positioned at the upper end of the lens unit and is used for capturing an image from the surface of the target.

2. The optical structure of an optical mouse as claimed in claim 1, wherein the light emitter is a non-visible light emitter.

3. The optical structure of an optical mouse as claimed in claim 1, wherein the light is a visible light.

4. The optical structure of an optical mouse as claimed in claim 1, wherein the light emitter is a laser.

5. The optical structure of an optical mouse as claimed in claim 1, wherein the light emitter is a light emitting diode.

6. The optical structure of an optical mouse as claimed in claim 1, wherein at least one light guiding prism is disposed around the lens unit on the projection path of the light emitter for guiding the light beam to be reflected into the light-collecting surface of the lens unit one or more times.

7. The optical structure of an optical mouse as claimed in claim 6, wherein at least one light guide prism is disposed on at least one side of the lens unit above the light-gathering surface.

8. The optical structure of an optical mouse as claimed in claim 6, wherein the lens unit has at least one light guide prism disposed on each of two sides of the lens unit above the light-gathering surface.

9. The optical structure of an optical mouse as claimed in claim 6, 7 or 8, wherein at least two of the light guiding prisms around the lens unit reflect each other such that the light beam is incident on the light-condensing surface by one or more reflections.

10. The optical structure of an optical mouse as claimed in claim 1, wherein the lens unit is a convex lens, and the light-condensing surface is formed on a bottom surface of the lens unit.

11. The optical structure of an optical mouse as claimed in claim 1, wherein the light sensing unit and the lens unit are located on the same normal line.

12. The optical structure of an optical mouse as claimed in claim 11, wherein at least one condensing lens for adjusting the sharpness of the image is disposed on the image capturing path between the light sensing unit and the lens unit.

13. The optical structure of an optical mouse as claimed in claim 1, wherein at least one light guide mirror for reflecting an image to the light sensing unit is disposed between the light sensing unit and the lens unit and is located on the image capturing path.

14. The optical structure of an optical mouse as claimed in claim 1, wherein the input device body has a base body, the base body has a space therein just above the projection path of the light beam and the image capturing path, and the lens unit is disposed in the space.

15. The optical structure of an optical mouse as claimed in claim 14, wherein the condensing lens is disposed in the space opposite to the top of the lens unit.

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