CN1841288A - Light guide structure of optical pen - Google Patents

Abstract

A light guide structure of an optical pen comprises: a light source, a light sensor and a light guide component. The light source emits light to an external surface, and the light sensor captures a reflected image light from the external surface, and the traveling direction of the reflected image light defines a capturing light direction. The light guide assembly is made of a light guide material and has a light incident surface, an extending portion and a light emitting surface. The light incident surface is adjacent to the light source. The extending portion extends from the light incident surface by a predetermined distance in a direction substantially parallel to and opposite to the light extracting direction. The light-emitting surface is positioned at the tail end of the extending part far away from the light-in surface, and light emitted by the light source can be guided by the light guide assembly and then emitted to the external surface at an inclination angle smaller than 50 degrees so as to improve the contrast and the identifiability of the reflected image light.

Description

Light guide structure of optical pen

technical field

The present invention relates to a light guide structure of an optical pen, especially a device that can integrate the functions of an optical mouse and handwriting recognition, and the light can be irradiated to the external surface at a predetermined angle by means of the light guide structure, so as to obtain a better image recognition function. optical pen.

Background technique

For desktop or notebook computers, personal digital assistants (Personal Digital Assistant; PDA for short), and smart phones (Smart Phone) and other electronic information devices that often have a large amount of data input requirements, handwriting input devices are undoubtedly Another convenient alternative to mouse and keyboard.

Currently, handwriting input devices in the prior art can be divided into three categories, one is used with a pressure-sensitive touch screen, the other is used with an electromagnetic induction digital panel, and the other is used with an optical pen. Because the optical pen has the characteristics of relatively low cost and is suitable for operating and writing on any surface, it has become a relatively common one among various handwriting input devices at present.

Please refer to FIG. 1 , which is a schematic diagram of an optical pen 10 in the prior art. Generally speaking, the optical pen 10 can actually be called a stick-shaped optical mouse. The pen-shaped body 11 is convenient for users to hold and write, and the light source 12 and light sensor 13 located at the lower end of the body 11 can capture the reflected image light of a small area 16 on the external surface 15 near the pen tip 14 . When the optical pen 10 moves, the captured image light will produce continuous and directional changes, so as to detect the moving direction and speed of the optical pen 10 . After the information is transmitted to the electronic information device connected to the optical pen 10 for processing, the purpose of handwriting input can be achieved.

However, the prior art optical pen 10 shown in FIG. 1 has an obvious disadvantage. Due to the limitation of the slender size of the pen tip 14, the light source 12 cannot be directly arranged near the pen tip 14, but needs to be arranged at a distance from the external surface 15. In the penholder body 11 of. However, in this way, the included angle θ1 between the light irradiated by the light source 12 and the external surface 15 is generally greater than 70 degrees. And when the user is accustomed to operate the optical pen 10 with a vertical pen holding posture, the value of the included angle θ1 may even approach 90 degrees. Under the large-angle direct irradiation of the light source 12, the contrast value of the image light reflected by the external surface 15 will decrease, so that the light sensor 13 receives insufficient signals, and thus increases the difficulty and error rate of image recognition. Therefore, the optical pen 10 of the prior art currently sold on the market needs to be used with a table mat or table top printed with a special pattern to improve the success rate of image recognition, but this limits the use. The operator can operate the mobility and convenience of the prior art optical pen 10.

No. 6,433,780 of U.S. Patent No. 6,433,780 disclosed an optical mouse, which achieved the goal of making the light source oblique by placing the light source on the side close to the external surface and having a considerable distance from the light sensor. Light can be directed at an external surface at an oblique angle. However, since US Pat. No. 6,433,780 discloses an optical mouse with relatively large width and length, the light source can be arranged obliquely at a position far away from the light sensor. However, in the technical field of the optical pen 10 to which the present invention is applicable, the body of the optical pen 10 is in the shape of an elongated pen shaft. The light source 12 and light sensor 13 located at the lower end of the main body 11 are arranged almost close together, and cannot be arranged at the pen tip so as to be close to the external surface. That is to say, it is impossible for the optical pen 10 of the prior art to set the light source in an oblique manner with a considerable distance from the light sensor as shown in US Pat. No. 6,433,780. Therefore, the technology disclosed in US Pat. No. 6433780 cannot be directly applied to the structure of the optical pen 10 .

Contents of the invention

The main purpose of the present invention is to provide a light guide structure for an optical pen. By setting the light guide assembly, the light emitted by the light source can be irradiated to the external surface at an oblique predetermined angle, so as to obtain better reflected image light.

To achieve the above purpose, the light guiding structure of the optical pen of the present invention may include: a light source, a light sensor and a light guiding component. The light source can emit light to an external surface, and the reflected image light from the external surface is captured by the light sensor, and the traveling direction of the reflected image light defines the direction of the captured light (the so-called captured light direction refers to the captured light direction). The traveling direction of the reflected image light captured by the light sensor). The light guide component is made of light guide material and has a light incident surface, an extension part, and a light exit surface. The light incident surface is adjacent to the light source. The extension portion extends from the light incident surface for a predetermined distance substantially along a direction parallel to and opposite to the direction of capturing light. The light exit surface is located at the end of the extension part away from the light entrance surface, that is, the light exit surface is adjacent to a predetermined position on the external surface, and the light emitted by the light source can enter the light guide assembly through the light entrance surface and then exit the light exit surface.

The light emitted by the light source can be guided by the light guide component and then directed toward the external surface at an angle of less than 50 degrees, so as to improve the contrast and recognizability of the reflected image light.

Among them, the light source can be a light-emitting diode (LED) or a miniature traditional tungsten bulb; the light sensor can be a field-effect transistor light sensor (CMOS Sensor) or a charge-coupled device light sensor (CCD); the light guide component is A solid long and narrow pyramid-column structure made of light-guiding material, such as transparent acrylic (polyacrylic resin), PC plastic (polycarbonate), glass, or quartz.

Preferably, the included angle between the light emitted by the light guide component and the external surface is preferably between 21-50 degrees, and when the included angle is between 25-40 degrees, it can have a better Image recognition effect.

Preferably, a cross-sectional area of the extension portion of the light guide component gradually decreases from the light-incident surface toward the light-exit surface.

Preferably, a cutout portion is provided on the part of the light guide component far away from the light source, so that the shape of the light guide component is like the nib structure of a general pen.

Preferably, a wear-resistant head cover is provided outside the light guide assembly to protect the end of the light guide assembly, and an opening is also provided at a position of the wear-resistant head cover relative to the light-emitting surface.

Description of drawings

Fig. 1 is the schematic diagram of a prior art optical pen;

Fig. 2 is the schematic diagram of the first preferred embodiment of the light guiding structure of the optical pen of the present invention;

3 is a schematic diagram of a second preferred embodiment of the light guide structure of the optical pen of the present invention;

4 is a schematic diagram of a third preferred embodiment of the light guide structure of the optical pen of the present invention;

5 is a schematic diagram of a fourth preferred embodiment of the light guide structure of the optical pen of the present invention;

6 is a schematic diagram of a fifth preferred embodiment of the light guide structure of the optical pen of the present invention;

7A is a schematic diagram of the appearance of the sixth preferred embodiment of the light guide structure of the optical pen of the present invention;

7B is a schematic cross-sectional view of a sixth preferred embodiment of the light guide structure of the optical pen of the present invention.

Explanation of reference numerals: 10 optical pen; 11 body; 12 light source; 13 light sensor; 14 nib; 15 external surface; 16 small area position; ; 22, 22a, 22b, 22c light source; 23, 23a, 23b, 23c lens; 24, 24a, 24b, 24c light sensor; 25, 25a, 25b, 25c control unit; 26 key; 27, 27c axis direction; 28, 28a, 28c capture light direction; 29 reflector; 30, 30a, 30b, 30c light guide structure; 31, 31a, 31b, 31c light guide assembly; 32 through hole; 33, 33b, 33c light incident surface; 34 , 34a, 34b, 34c extension; 35, 35a, 35b light exit surface; 36 bending portion; 37, 37a light exit direction; 38 light guide bridge structure; 39 extension area; 50, 70 optical pen; 52 nib; 53, 72 light source; 55, 73 lens; 56, 74 light sensor; 57, 81 light guide assembly; wear-resistant headgear; 91, 91a, 91c, 63 external surface; 92, 631 predetermined position; 75 control unit; 76 key; 77 elastic component; 78 pressure sensor; Hole; 83 light incident surface; 84 reflective surface; 85 light exit surface; 891 opening.

Detailed ways

Please refer to FIG. 2 , which is a schematic diagram of a first preferred embodiment of the light guiding structure of the optical pen 70 of the present invention. The first preferred embodiment of the optical pen 70 of the present invention may include: a pen shaft 71, a light source 72, a lens 73, a light sensor 74, a control unit 75, a button 76, an elastic component 77, a pressure sensor 78, and a light guide structure. In this preferred embodiment, the light guiding structure includes a positioning frame 80 and a light guiding component 81 . The positioning frame 80 is provided with positioning holes 801 and 802 with predetermined shapes for accommodating and positioning the light source 72 , the light guide assembly 81 , and the lens 73 . In addition, the light guide assembly 81 is located at the end (lower end) of the pen barrel 71 and constitutes the nib portion of the optical pen 70 .

The pen holder 71 constitutes the body of the optical pen 70 for accommodating various components of the optical pen 70 . In this embodiment, the penholder 71 is a long and narrow penholder-shaped component and generally has a predetermined length and width suitable for being held by a human hand.

The light source 72 is used to generate light to irradiate to a predetermined position 92 on an external surface 91 near the end (lower end) of the penholder 71 for obtaining a reflected image light of a small area of the predetermined position 92 on the external surface 91 . In this embodiment, the light source 72 can be a light emitting diode (LED) or a miniature traditional tungsten bulb. Moreover, the traveling direction of the reflected image light defines the light extraction direction 79 , and in this preferred embodiment, the light extraction direction 79 is substantially parallel to but not overlapped with the extending direction of the elongated pen shaft 71 .

The lens 73 is disposed in front of the light sensor 74 and can be a single lens or a lens group. The lens 73 can gather the reflected image light and image it on the light sensor 74 .

The light sensor 74 is used to capture the reflected image light from the predetermined position 92 near the end (lower end) of the pen holder 71 and convert it into an electrical signal. In this embodiment, the light sensor 74 can be a field effect transistor light sensor (CMOS Sensor) or a charge-coupled device light sensor (CCD), and is located on the light-picking direction 79 .

The control unit 75 is connected to the light source 72 and the light sensor 74, accepts the electrical signal from the light sensor 74, and performs calculation and processing to generate a corresponding first control signal, which is sent to the An external electronic information device (not shown) connected to the optical pen 70 performs further calculation processing to perform the first predetermined function, such as controlling the movement and positioning of the cursor position, or performing handwriting input functions.

The button 76 is connected to the control unit 75 . By pressing the button 76, the control unit 75 can generate a corresponding second control signal, which is transmitted to the connected external electronic information device for further calculation and processing, so as to execute the second predetermined function, such as executing the position of the cursor. The corresponding function performer (that is, the function similar to a traditional mouse button).

The elastic component 77 abuts between the positioning frame 80 and the inner wall structure of the pen holder 71 . The elastic component 77 can provide a restoring force, so that the positioning frame 80 together with the light source 72, the light guide component 81 and the lens 73 can perform a slight (about 0.5-5 mm distance) upward and downward compression displacement relative to the pen holder 71. The other end of the elastic component 77 is connected with the pressure sensor 78 . The pressure sensor 78 can detect the pressure change of the elastic component 77 caused by the compression displacement of the positioning frame 80 (together with the light source 72, the light guide component 81 and the lens 73), and generate a corresponding third control signal and transmit it to the control unit 75 To perform the third predetermined function, for example, when performing handwriting input, the stroke thickness can be changed according to the pressure, so as to achieve the function of writing calligraphy.

A wear-resistant cap 89 is sheathed outside the light guide assembly 81 to protect the pen tip. Since the light guide component 81 is made of transparent plastic and other materials, the nib at the end needs to be rubbed against the external surface 91 for a long time, which is prone to wear and tear. Therefore, in this preferred embodiment, a wear-resistant headgear 89 is specially added to be sleeved on the light guide assembly 81, and an opening 891 is designed at the pen tip near the end, so that the light can hit the predetermined position 92 of the external surface 91 at a low angle, so that The light sensor 74 can capture images more clearly.

As shown in FIG. 2 , the light guide assembly 81 of the present invention is supported by the positioning frame 80 and located at the end (lower end) of the pen holder 71 to form a nib structure with the pen holder 71 . Moreover, the light guiding component 81 is a solid long and narrow conical columnar structure which defines a nib axis direction 82 for the reflected image light to pass through. In this preferred embodiment, the light guide component 81 is made of light guide material (such as transparent acrylic, PC plastic, glass, or quartz, etc.) and has a light incident surface 83 and a reflective surface 84 , and a light-emitting surface 85 . The light incident surface 83 is adjacent to the light source 72 . In this preferred embodiment, the light incident surface 83 is designed as a convex structure, which can gather the divergent light emitted by the light source 72, so that the light emitted by the light source 72 can become Parallel light generally travels along the axis direction 82 of the pen tip. The inner diameter of the light guide assembly 81 gradually shrinks from the light incident surface 83 along the pen tip axis direction 82 to form a narrow and long conical columnar structure. The light guide assembly 81 with this narrow and long conical columnar structure can provide a Spotlight effect. The reflective surface 84 and the light emitting surface 85 are located at an end (bottom) of the light guide component 81 away from the light incident surface 83 , and the position of the light emitting surface 85 is adjacent to the predetermined position 92 of the external surface 91 .

The light guide material of the light guide component 81 has a predetermined light refraction index, so that the light traveling inside the light guide component 81, as long as the angle between the light traveling direction and the surface of the light guide component 81 is less than a predetermined angle, the The light will be reflected by the surface of the light guiding component 81 , thus providing a light guiding function. For example, when transparent PC plastic is selected as the material of the light guide assembly 81 in this preferred embodiment, as long as the included angle between the direction of light travel and the surface of the light guide assembly 81 is less than about 37 degrees, the light will flow in the light guide assembly 81. The inside of the light module 81 is totally reflected. In contrast, if the included angle between the light traveling direction and the surface of the light guide component 81 is greater than 37 degrees, the light will pass through and exit the light guide component 81 . Taking advantage of the light reflection properties of the light guide material, the light guide structure of the optical pen of the present invention is particularly provided with a reflective surface 84 at the end of the light guide component 81 on the other side corresponding to the light emitting surface 85 . There is a predetermined angle between the reflective surface 84 and the axis direction 82 of the nib. The included angle of the predetermined angle is an acute angle, and it can make the angle of the parallel light traveling along the axis direction 82 of the pen point to the reflective surface 84 less than 37 degrees. In this way, the parallel light inside the light guiding component 81 will be totally reflected by the reflective surface 84 and redirected to the light emitting surface 85 . Moreover, the angle between the light reflected by the reflective surface 84 and the light-emitting surface 85 will pass through the surface of the light guide component 81 because the angle is greater than 37 degrees, and then radiate to the predetermined position 92 on the external surface 91 . In this preferred embodiment, the angle θ between the light emitted from the light-emitting surface 85 of the light guide component 81 and the external surface 91 can be between 21° and 50°, and the light reflected by the external surface 91 at this time The contrast value of the reflected image light will be greatly increased compared with the prior art shown in FIG. It can be operated and used correctly even when it is not on the specially printed table mat. In addition, according to the experiment of the present invention, if the value of the aforementioned included angle θ is between 25° and 40°, the quality and resolution of the image captured by the light sensor 74 can be further improved.

In another preferred embodiment of the present invention, the reflective surface 84 of the light guide component 81 can also be designed as an arc surface or a spherical structure, so as to play the role of concentrating the parallel light inside the light guide component 81, A relatively high light intensity is acceptable at the predetermined position 92 .

Please refer to FIG. 3 , which is a schematic diagram of a second preferred embodiment of the light guide structure 30 of the optical pen 20 of the present invention. The second preferred embodiment of the optical pen 20 of the present invention also includes: a pen holder 21, a light source 22, a lens 23, a light sensor 24, a control unit 25, a button 26, and a light guide structure 30 . In this preferred embodiment, the light guiding structure 30 also includes a light guiding component 31 , and the light guiding component 31 is also located at the end (lower end) of the pen barrel 21 and also constitutes the nib portion of the optical pen 20 .

The pen holder 21 constitutes the body of the optical pen 20 for accommodating various components of the optical pen 20 . In this embodiment, the penholder 21 is a long and narrow penholder-shaped component and generally extends along an axial direction 27 for a predetermined length. Therefore, in the second preferred embodiment, the nib of the optical pen 20 (which is formed by the light guide component 31 ) and the pen barrel 21 have the same axis direction 27 .

The light source 22 is used for generating light to irradiate a predetermined position 92 on an external surface 91 near the end (lower end) of the pen holder 21 to obtain reflected image light. The traveling direction of the reflected image light defines an extraction light direction 28 , and in this preferred embodiment, the extraction light direction 28 overlaps with the axis direction 27 .

The lens 23 is arranged in front of the light sensor 24 , which can gather the reflected image light and form an image on the light sensor 24 .

The light sensor 24 is used to capture the reflected image light from the predetermined position 92 and convert it into an electrical signal. In this embodiment, the light sensor 24 is located on the axial direction 27 .

The control unit 25 is connected to the light source 22 and the light sensor 24, receives the electrical signal from the light sensor 24, and generates a corresponding first control signal after processing it. The button 26 is connected to the control unit 25 . By pressing the button 26, the control unit 25 can generate a corresponding second control signal.

As shown in FIG. 3 , the light guide assembly 31 of the present invention is located at the end (lower end) of the pen holder 21 and forms a nib structure coaxial with the pen holder 21 . Moreover, the light guiding component 31 is a hollow ring columnar structure, which is provided with a through hole 32 extending along the light-capturing direction for the reflected image light to pass through. The light guide component 31 has a light incident surface 33 , an extension portion 34 , and a light exit surface 35 . The light incident surface 33 is adjacent to the light source 22 . The extension portion 34 extends a predetermined distance from the light incident surface 33 generally along a direction opposite to the light-capturing direction 28 . The light emitting surface 35 is located at an end of the extension portion 34 farther from the light incident surface 33 and is adjacent to the predetermined position 92 of the external surface 91 . After the light emitted by the light source 22 enters the light guide component 31 through the light incident surface 33 at a predetermined angle, it can be guided by the light guide component 31 after one or more total internal reflections inside the light guide component 31 The light is emitted from the light exit surface 35 to achieve the function of guiding the light traveling route.

In the second preferred embodiment, the extension portion 34 of the light guide component 31 further has a bending portion 36 bent toward the light-capturing direction 28 at a position close to the light-emitting surface 35 . Moreover, the light-emitting surface 35 of the light-guiding component 31 is an oblique plane (but it can also be an arc surface or a spherical surface), and the included angle θ2 between the light-emitting surface 35 and the light-picking direction 92 is Between 21 and 50 degrees. That is to say, when the optical pen 20 is standing upright on the external surface 91 in a nearly vertical manner, a light-emitting direction 37 defined by a direction perpendicular to the light-emitting surface 35 , the distance between it and the external surface 91 In principle, the included angle θ3 will be equal to the angle of θ2, that is, the angle between 21° and 50°. When the angle of θ2 or θ3 is between 21-50 degrees, the contrast value of the reflected image light reflected by the external surface 91 will be greatly increased compared with the prior art shown in FIG. 1 , so the optical pen 20 of the present invention The quality and resolution of images captured by the light sensor 24 will also be significantly improved.

In addition, in the light guide structure 30 of the optical pen 20 of the present invention, the value of the included angle θ2 between the light-emitting surface 35 and the light-capturing direction 28 is more preferably between 25 degrees and 40 degrees. Not only when the value of the included angle θ2 of the present invention is between 25 degrees and 40 degrees, relatively good reflection image quality and recognition rate can be obtained, but also, even if the user is at an angle of inclination (about 5 degrees to 40 degrees) angle between 15 degrees) when holding and operating the optical pen 20, the value of the included angle θ3 between the light emitting direction 37 and the external surface 91 will not be greater than 55 degrees, and a good reflection image can also be obtained quality and resolution.

In other preferred embodiments of the present invention described below, most components are the same or similar to the foregoing embodiments. Therefore, the same or similar components will be given the same number and component name, and the detailed structure will not be repeated, but only an English letter will be added after the original number for distinction.

As shown in FIG. 4 , it is a schematic diagram of a third preferred embodiment of the light guide structure 30 b of the optical pen 20 b of the present invention. The optical pen 20b of the third preferred embodiment also has a pen shaft 21b, a light source 22b, a lens 23b, a light sensor 24b, a control unit 25b, and a light guiding structure 30b (light guiding component 31b). The differences are:

A cross-sectional area of the extension portion 34b of the light guide component 31b gradually decreases from the light incident surface 33b toward the light exit surface 35b, forming a tapered conical structure. In addition, two or more light sources 22b are provided on the light incident surface 33b of the light guide component 34b to increase brightness. In FIG. 4 , the angle of θ3 is also between 21° and 50°.

As shown in FIG. 5 , it is a schematic diagram of a fourth preferred embodiment of the light guide structure 30 c of the optical pen 20 c of the present invention. The optical pen 20c of the fourth preferred embodiment also has a pen shaft 21c, a light source 22c, a lens 23c, a light sensor 24c, a control unit 25c, and a light guiding structure 30c (including the light guiding component 31c). The differences are:

The light-incident surface 33c of the light-guiding component 31c is designed to be widened and enlarged, so that the light from the light source 22c is incident into the light-guiding component 31c from the light-incident surface 33c. Moreover, a light guide bridge structure 38 is provided in the middle region of the extension part 34c, so that part of the light in the light guide assembly 31c can be guided by the light guide bridge structure 38 to another extension part farther away from the light source 22c. area 39, so that the external surface 91c can be illuminated with more uniform light. In addition, a reflector 29 is further provided inside the optical pen 20c, which can change the direction 28c of picking up light, so that the light sensor 24c does not need to be arranged on the axial direction 27c. In FIG. 5 , the angle of θ3 is also between 21° and 50°.

As shown in FIG. 6 , it is a schematic diagram of a fifth preferred embodiment of the light guide structure of the optical pen 50 of the present invention. In this preferred embodiment, the optical pen 50 can also include: a shaft 51 , a tip 52 , a light source 53 , a lens 55 , a light sensor 56 , and a light guide component 57 . The differences are:

The upper end of the light guiding component 57 is adjacent to the light source 53 , and the other end is adjacent to the pen tip 52 and has an inclined cone 571 . A reflective surface can be formed on the inclined cone surface 571, for example, a light reflective material can be coated on its outer surface, or simply arranged at an appropriate angle so that the light source inside the light guide component 57 can be reflected by the inclined cone surface 571 and refracted. Towards. With the arrangement of the light guide component 57, the light generated by the light source 53 can be guided and concentrated to a predetermined position 631 near the pen tip 52 on the external surface 63 at an inclination angle between 21° and 50° to achieve light concentration. Effect. Moreover, the optical path 64 of the reflected image light is coaxial with (that is, overlaps with) the axial direction 62 of the pen holder 51 .

In addition, a cutout portion 572 is included in the portion of the light guide component 57 that is farther away from the light source 53 and closer to the predetermined position 631 (ie, the lower right corner of the light guide component 57 shown in FIG. 6 ). The cutout portion 572 can make the shape of the light guide assembly 57 similar to the nib structure of a general pen, and can have a relatively sharp nib 52 to facilitate the user to write.

As shown in FIG. 7A and FIG. 7B , they are respectively a schematic appearance diagram and a schematic cross-sectional diagram of a sixth preferred embodiment of the light guide structure of the optical pen 50 of the present invention. In this preferred embodiment, the optical pen 50 can also include: a shaft 51 , a tip 52 , a light source 53 , a lens 55 , a light sensor 56 , and a light guide component 57 . The differences are:

A wear-resistant cap 69 is provided outside the light guide assembly 57 to protect the pen tip 52 . Since the light guide component 57 can be made of transparent plastic or other materials, the pen tip 52 needs to be rubbed against the external surface 63 for a long time, which is prone to wear and tear. Therefore, in this preferred embodiment, a wear-resistant headgear 69 is specially added to be sleeved on the light guide assembly 57, and the cut-off portion 572 close to the pen tip 52 is also cut off to leave an opening, so that the light can be between 21~ The low angle of 50 degrees hits the external surface 63 close to the predetermined position 631 of the pen tip 52, so that the light sensor 56 can capture images more clearly.

The above-mentioned embodiments should not be used to limit the applicable scope of the present invention, and the protection scope of the present invention should be based on the technical spirit defined by the claims of the present invention and the range covered by equivalent changes. That is, all equivalent changes and modifications made according to the claims of the present invention will still not lose the gist of the present invention, nor depart from the spirit and scope of the present invention, so all should be regarded as further implementation status of the present invention.

Claims (10)

1. A light guide structure for an optical pen, the optical pen includes a light source and a light sensor, the light source can emit light to a predetermined position on an external surface, and the predetermined position is captured by the light sensor A reflected image light of position, characterized in that: The light guide structure includes a light guide component, the light guide component is made of light guide material, and has a light incident surface and a light exit surface, the light incident surface is adjacent to the light source, and the light exit surface is adjacent to the external surface At the predetermined position, the light emitted by the light source can enter the light guide component through the light-incident surface and then be emitted from the light-exit surface. 2. The light guiding structure of an optical pen according to claim 1, wherein the light guiding structure defines a light emitting direction from the light emitting surface, and the included angle between the light emitting direction and the external surface is between 21 ~50 degree angle. 3. The light guiding structure of an optical pen according to claim 2, wherein the light guiding structure defines a light emitting direction in which light exits the light emitting surface, and the included angle between the light emitting direction and the external surface is between 25° ~40 degree angle. 4. The light guiding structure of an optical pen according to claim 1, wherein the light guiding component is a solid long and narrow conical columnar structure, and a reflective surface with a predetermined angle is provided on the other side of the light guiding component corresponding to the light exiting surface The reflective surface with the predetermined angle can make the light inside the light guide assembly be totally reflected by the reflective surface, and redirected to the light exit surface, and then exit the light guide assembly from the light exit surface. 5. The light guiding structure of an optical pen according to claim 1, wherein the light incident surface is designed as a convex structure, which can gather the light emitted by the light source, so that the light emitted by the light source is incident on the light incident surface After entering the light guide component, it can become parallel light that generally travels along the extending direction of the light guide component; moreover, a cross-sectional area of the light guide component is gradually reduced from the light incident surface toward the light exit surface. 6. The light guiding structure of an optical pen as claimed in claim 1, wherein the light incident surface of the light guiding component is designed as a widened and enlarged structure, so that the light from the light source enters the light guiding surface from the light incident surface In the component, and a light guide bridge structure is also provided in a middle section of the light guide component, so that part of the light in the light guide component can be guided by the light guide bridge structure to another light source that is farther away from the light source. extension area. 7. The light guiding structure of the optical pen according to claim 1, wherein the optical pen further comprises a long and narrow pen barrel extending along an axis direction, the light guiding component is located at one end of the pen barrel and constitutes a The nib structure of the pen shaft is coaxial, and the light guide component is a hollow ring columnar structure, which is provided with a through hole extending along the light-picking direction for the reflected image light to pass through. 8. The light guiding structure of an optical pen according to claim 1, wherein the optical pen further comprises: A control unit, connected to the light source and the light sensor, accepts the electrical signal from the light sensor, and generates a corresponding first control signal after calculation and processing; a button connected to the control unit, the control unit can generate a corresponding second control signal by pressing the button; An elastic component, linked to the light guide component, the elastic component can provide resilience so that the light guide component can be slightly compressed and displaced; A pressure sensor, connected to the elastic component, can detect the pressure change of the elastic component and generate a corresponding third control signal; and, A lens is arranged in front of the light sensor so that the reflected image light can be imaged on the light sensor. 9. The light guide structure of an optical pen according to claim 1, wherein a wear-resistant head cover is sheathed outside the light guide assembly to protect the end of the light guide assembly, and the wear-resistant head cover is relatively opposite to the light guide assembly An opening is provided at the position of the light-emitting surface. 10. A light guide structure for an optical pen, the optical pen includes a light source and a light sensor, the light source can emit light, and the light sensor captures a reflected image light caused by the light, and the reflected The direction in which the image light travels is defined as a pick-up light direction, which is characterized in that: The light guide structure includes a light guide component, which is made of light guide material and has a light incident surface, a reflective surface, and a light output surface, the light incident surface is adjacent to the light source, and the reflective surface The light exit surface is located at the end of the light guide component away from the light incident surface and they correspond to each other, so that the light emitted by the light source can enter the light guide component through the light incident surface, and then reflect from the light exit surface through the reflection of the reflective surface. shoot out Wherein, the configuration angle of the reflective surface can make the light emitted by the light source enter the light guide assembly through the light incident surface, and then strike the reflective surface at a relatively small incident angle, so that it can be totally reflected by the reflective surface, and Instead, the light is emitted to the light-emitting surface at a relatively large incident angle, so that the light can be emitted from the light-emitting surface to the outside of the light guide assembly.

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