CN104808815B - Pen-shaped optical sensing device - Google Patents

Abstract

The present invention discloses a pen-type optical sensing device, comprising a pen holder, a circuit board assembly and an optical sensing device. The pen holder is extended along an axial direction. The optical sensing device is arranged at one end of the pen holder and is electrically connected to the circuit board assembly arranged in the pen holder. The optical sensing device comprises a light emitting component, a light guiding component, a lens and a sensing component. The light emitting component emits a light. The light guiding component guides the light to be emitted to an object along an illumination path, and the object reflects a reflected light. The light guiding component surrounds the lens, and the lens guides the reflected light. The sensing component captures the reflected light from the lens through its imaging path. The illumination path and the imaging path are coaxial, so that an image with uniform illumination and clear imaging can be obtained. In this way, the pen-type optical sensing device can be used flexibly when tilted.

Description

Pen Type Optical Sensing Device

technical field

The invention relates to a pen-shaped optical sensing device, in particular to a pen-shaped optical sensing device with a high tilt angle and high image quality.

Background technique

With the advancement of technology, the industry has developed a variety of optical sensing devices, which are used in different electronic devices. For example, it can be applied in optical mouse, scanner, multi-function printer and optical fingerprint recognition system, etc., and the optical sensing device in these electronic devices is used to capture or sense the optical image or image variation of an object.

Generally, a user uses an optical mouse to operate an electronic device, such as a desktop computer. The existing optical mouse includes an optical sensing device, and the user can hold the optical mouse to drive the optical mouse to move on the desktop. The optical sensing device measures the image variation of the emitted light to the object, and then changes the cursor displayed on a display of the electronic device. In this way, users can adjust commands or operations for this computer. However, when using an optical mouse, the user often needs to adjust and move the wrist to move the mouse. In this way, when the user uses the optical mouse for a long time, it needs to constantly adjust and move the wrist, which will easily cause soreness or discomfort in the user's wrist.

Then, the industry developed a pen-type mouse, the optical sensing device is arranged at one end of the pen shaft, and the optical sensing device includes a light-emitting component and a sensor. The lighting unit is located on one side inside the barrel, and the sensor is on the other side inside the barrel. When the light-emitting component emits an incident light on an object (such as a desktop), the incident light and the normal line of the table form an incident angle greater than zero, the object generates reflected light, and then the reflected light is reflected to the sensor, and the sensor performs image processing. processing, and then convert the image into an electronic signal for subsequent processing by the pen mouse. Wherein, a reflection angle greater than zero is formed between the reflected light and the normal line of the desktop, and the incident angle is equal to the reflection angle. Generally speaking, when users hold a pen-type mouse, they often have different usage habits, so that the pen holder is held at various angles inclined to the desktop. When the prior art pen-type mouse is used at various inclination angles, problems such as uneven brightness and unclear images (modulus function modulus (Modulation Transfer Function, MTF) value is too low) and other problems occur, so that the sensor cannot Capturing bright light and forming clear images, which greatly reduces the sensing function of the pen-type mouse and reduces the sensitivity of the pen-type mouse.

Contents of the invention

The object of the present invention is to provide a pen-type optical sensing device, so as to solve the above-mentioned problems of uneven brightness, unclear image and low sensitivity.

To achieve the above object, the present invention provides a pen-shaped optical sensing device, which includes a pen shaft, a circuit board assembly, and an optical sensing device. The penholder extends along an axial direction. The circuit board assembly is arranged in the pen holder. The optical sensing device is arranged at one end of the pen holder and is electrically connected with the circuit board assembly. The optical sensing device includes at least one light-emitting element, a light-guiding element, a lens and an inductive element. At least one light emitting element is used for emitting a light. The light guide is used to guide the light to an object along an irradiation path in a concentrated manner, and the object reflects a reflected light. The lens is used to guide the reflected light. The sensing element has an image-taking path, and the sensing element is used to capture reflected light from an object (such as a desktop) through the image-capturing path, and the illuminating path and the image-capturing path tend to be coaxial.

Wherein, the axis and the imaging path form an acute angle.

Wherein, the light guide has an incident portion and an outgoing portion opposite to each other and a through hole passing through the incident portion and the outgoing portion, the through hole has a first opening and a second opening, and the at least one light-emitting element Located at the incident portion, the sensing element corresponds to the first opening.

Wherein, the incident part of the light guide has a light incident surface, the exit part has a light exit surface, the at least one light-emitting element faces the light incident surface, and the light emitted by the at least one light-emitting element comes from the light incident surface. The surface enters the light guide and exits from the light exit surface.

Wherein, the area of the light incident surface is smaller than the area of the light output surface.

Wherein, the width of the incident portion is larger than the width of the outgoing portion.

Wherein, when the number of the at least one light-emitting element is two, the two light-emitting elements are respectively disposed at opposite ends of the incident portion of the light guide element.

Wherein, a pen head is further included, which is arranged outside the optical sensing device, and the pen head has an outlet corresponding to the second opening of the through hole.

Wherein, the penholder has an accommodating space, the circuit board assembly is arranged in the accommodating space, and the optical sensing device is located at one end of the accommodating space.

Wherein, the circuit board assembly includes a power supply module and a wireless transceiver module, and the at least one light-emitting element is a light-emitting diode module.

According to the pen-shaped optical sensing device disclosed in the present invention, the illumination path and the imaging path tend to be coaxial. Therefore, when the pen holder is used with a large angle of inclination relative to the object, the pen-shaped optical sensing device can still obtain a uniform and clear image, thereby improving the sensitivity of the pen-shaped optical sensing device. Therefore, when the pen-shaped optical sensing device is used tilted on an object (such as a tabletop), the pen-shaped optical sensing device can be used flexibly and smoothly, and the operating angle range of the pen-shaped optical sensing device can be improved. In this way, the present invention solves the problem of insensitivity caused by uneven brightness and poor imaging (low MTF value) of the pen-shaped optical sensing device in the prior art in the wide-angle range of use.

Furthermore, compared with the prior art where there is an acute angle between the incident light and the reflected light, which makes the volume larger, the pen-shaped optical sensing device in this case has a light emitting path and a reflected light imaging path that tend to be coaxial, so Can greatly reduce the volume.

In some embodiments, there is an acute angle between the axis of the pen holder and the imaging path, so that when the pen holder is tilted at a large angle relative to the object, the pen-shaped optical sensing device can obtain more uniform and clear images.

The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments, but not as a limitation of the present invention.

Description of drawings

FIG. 1 is a schematic diagram of a pen-shaped optical sensing device according to an embodiment of the invention.

FIG. 2 is a partially enlarged schematic view of a pen-shaped optical sensing device according to an embodiment of the invention.

FIG. 3 is a schematic cross-sectional view of an optical sensing device according to an embodiment of the invention.

FIG. 4 is a schematic cross-sectional view of an optical sensing device according to another embodiment of the present invention.

FIG. 5A is a diagram of brightness distribution of a pen-shaped optical sensing device according to an embodiment of the present invention.

FIG. 5B is a luminance distribution diagram along the Y-axis coordinate 0 in FIG. 5A .

FIG. 5C is a luminance distribution diagram along the X-axis coordinate 0 in FIG. 5A .

FIG. 6A is a luminance distribution diagram of a pen-shaped optical sensing device in the prior art.

FIG. 6B is a luminance distribution diagram along the Y-axis coordinate 0 in FIG. 6A .

FIG. 6C is a luminance distribution diagram along the X-axis coordinate 0 in FIG. 6A .

7A is a simulated analysis diagram of the sharpness (MTF) of the pen-shaped optical sensing device according to an embodiment of the present invention, in which the axial direction is 30 degrees from the imaging path and the axial direction is 55 degrees from the object normal.

FIG. 7B is a simulated analysis diagram of the sharpness (MTF) between the axial direction and the normal line of the object at 55 degrees in the conventional pen-shaped optical sensing device.

FIG. 8A is a luminance distribution diagram of the pen-shaped optical sensing device shown in FIG. 7A .

FIG. 8B is a luminance distribution diagram along the Y-axis coordinate 0 in FIG. 8A .

FIG. 8C is a luminance distribution diagram along the X-axis coordinate 0 in FIG. 8A .

FIG. 9A is a luminance distribution diagram of the pen-shaped optical sensing device shown in FIG. 7B .

FIG. 9B is a luminance distribution diagram along the Y-axis coordinate 0 in FIG. 5A .

FIG. 9C is a luminance distribution diagram along the X-axis coordinate 0 in FIG. 5A .

FIG. 10A is a simulated analysis diagram of the sharpness (MTF) of the penholder's axis and the imaging path at 45 degrees and the axis and the object normal at 70 degrees in a pen-shaped optical sensing device according to another embodiment of the present invention.

FIG. 10B is a simulated analysis diagram of the sharpness (MTF) of another pen-shaped optical sensing device in the prior art at a 70-degree angle between the axial direction and the object normal.

FIG. 11A is a luminance distribution diagram of a pen-shaped optical sensing device according to another embodiment of the present invention.

FIG. 11B is a luminance distribution diagram along the Y-axis coordinate 0 in FIG. 11B .

FIG. 11C is a luminance distribution diagram along the X-axis coordinate 0 in FIG. 11A .

FIG. 12A is a luminance distribution diagram of another pen-type optical sensing device in the prior art.

FIG. 12B is a luminance distribution diagram along the Y-axis coordinate 0 in FIG. 12A .

FIG. 12C is a luminance distribution diagram along the X-axis coordinate 0 in FIG. 12A .

Among them, reference signs:

1 Pen-shaped optical sensing device

10 pen holders

11 first end

12 second end

13 storage space

20 circuit board assembly

21 power module

22 wireless transceiver module

30 Optical sensing device

31 Luminous pieces

32 light guide

321 entrance

321a Light incident surface

322 Exit Department

322a Light-emitting surface

323 through hole

323a First opening

323b Second opening

33 lens

331 Side view

332 like profile

34 sensor

35 Micro Circuit Board

40 tip

41 fixed part

42 Disassembly part

421 Exit

A axis

C image acquisition path

Θ acute angle

detailed description

The detailed features and advantages of the present invention are described in detail below in the embodiments, the content of which is sufficient to enable any person skilled in the art to understand the technical content of the present invention and implement it accordingly, and according to the content disclosed in this specification, the patent scope of the application and the drawings , any person skilled in the art can easily understand the related objects and advantages of the present invention. The following examples further illustrate the concept of the present invention in detail, but do not limit the scope of the present invention in any way.

The invention provides a pen-type optical sensing device for connecting an electronic device in a wireless or physical electrical connection. A user manipulates the pen-type optical sensing device to provide a control command to the electronic device. For example, when the user manipulates the pen-type optical sensing device to move on an object, a cursor on a graphic interface displayed on a display of the electronic device can be made to perform a relative displacement. The user can move the cursor to different icons on the graphical interface, and then control the electronic device to execute different programs. In addition, the pen-type optical sensing device of the present invention can be called a pen-type optical mouse.

Please refer to Figure 1 and Figure 2 at the same time. 1 is a schematic diagram of a pen-shaped optical sensing device according to an embodiment of the present invention. FIG. 2 is a partially enlarged schematic view of a pen-shaped optical sensing device according to an embodiment of the invention. According to an embodiment of the present invention, a pen-shaped optical sensing device 1 is disclosed, which includes a pen shaft 10 , a circuit board assembly 20 and an optical sensing device 30 . The pen holder 10 extends along an axis A. In this embodiment, the pen holder 10 has a first end 11 and a second end 12 opposite to each other and an accommodating space 13 inside the pen holder 10 . The circuit board assembly 20 is disposed in the accommodating space 13 in the pen holder 10 . The optical sensing device 30 is disposed at the first end 11 of the pen holder 10 and is electrically connected to the circuit board assembly 20 , and the optical sensing device 30 is also located at one end of the accommodating space 13 .

In this embodiment and some other embodiments, the pen-shaped optical sensing device 1 further includes a brush tip 40 disposed on the first end 11 of the pen barrel 10 to cover most of the optical sensing device 30 . The pen head 40 has a fixing part 41 and a detachment part 42 . The fixing part 41 is fixedly arranged on the first end 11 of the pen holder 10 , and the detachment part 42 is connected to the fixing part 41 . In this embodiment, the dismounting part 42 is fixed to the fixing part 41 by screws. However, in other embodiments, other ways can be used to fix the fixing part 41 and the detachment part 42 to each other. For example, the fixing part 41 and the detachment part 42 may each include a corresponding threaded part, and the detachment part 42 is arranged on the fixing part 41 in a rotating manner; or, the fixing part 41 and the detachment part 42 are fixed to each other in an engaging manner; or, the pen The fixing part 41 and the detachment part 42 of the head part 40 are integrally formed. In addition, the dismounting part 42 has an outlet 421 for exposing one end of the optical sensing device 30 . However, in other embodiments, the pen-shaped optical sensing device 1 may not include the pen head 40 , so that the optical sensing device 30 is directly exposed to the outside from the first end 11 and is directly fixed on the pen barrel 10 .

In the present invention, the axial direction A of the pen holder 10 is defined as the extending direction from the first end 11 to the second end 12 of the pen holder 10 .

In this embodiment and some other embodiments, the circuit board assembly 20 is used to process the signal transmission between the electronic device (not shown) and the optical sensing device 30 . In this embodiment and some other embodiments, the circuit board assembly 20 includes a power module 21 and a wireless transceiver module 22 . The power module 21 is used to provide electric energy. The power module 21 can be a detachable or non-detachable battery, and can be a rechargeable or disposable battery, but the type of the battery is not intended to limit the present invention. The wireless transceiver module 22 is used to receive and send signals to the electronic device in a wireless transmission method, and the wireless transmission method may be Bluetooth (Bluetooth), Wireless Fidelity (Wi-Fi, Wireless Fidelity), infrared rays or other existing technologies. The transmission method is not repeated here. In addition, in other embodiments, the circuit board assembly 20 does not include the power supply module 21 and a wireless transceiver module 22, and the pen-shaped optical sensing device 1 is electrically connected to the electronic device through a physical cable, and the electronic device provides power and signals. A pen type optical sensing device 1 is provided. Furthermore, a plurality of buttons (not shown) can be arranged on the pen holder 10 to drive the circuit board assembly 20 to send signals. For example, the button is used to adjust the switch and resolution (such as dpi, dots per inch) of the pen-shaped optical sensing device 1 or to give a command to the electronic device, so that the electronic device executes a related program.

The structure of the optical sensing device 30 will be described in detail below. Please refer to FIG. 2 and FIG. 3 at the same time, wherein FIG. 3 is a schematic cross-sectional view of an optical sensing device according to an embodiment of the present invention. In this embodiment, the optical sensing device 30 includes a light emitting element 31 , a light guiding element 32 , a lens 33 and a sensing element 34 . In this embodiment, the optical sensing device 30 further includes a micro circuit board 35 . The micro circuit board 35 is fixed and electrically connected to the circuit board assembly 20 , and the light emitting element 31 and the sensing element 34 are fixedly disposed on the micro circuit board 35 . The micro circuit board 35 is used to control the lighting of the light emitting element 31 and control the image capturing, image processing and signal transmission of the sensing element 34 .

In this embodiment, the light emitting element 31 is used to emit light (not shown). In this embodiment, the light emitting element 31 is a light emitting diode module (Light Emitting Diode, LED for short), used for emitting a blue light, a red light or an infrared light. However, the types of the above-mentioned light-emitting elements 31 and the types of light emitted are not intended to limit the present invention.

In this embodiment, the light guide 32 has an incident portion 321 , an output portion 322 and a through hole 323 . The incident portion 321 and the outgoing portion 322 are respectively located on opposite sides. In this embodiment, the width of the light guide 32 is tapered from the incident portion 321 to the exit portion 322 , and the width of the incident portion 321 is greater than the width of the exit portion 322 . Furthermore, the through hole 323 passes through the incident portion 321 and the outgoing portion 322 , so that the through hole 323 has a first opening 323 a located at the incident portion 321 and a second opening 323 b located at the outgoing portion 322 . Both ends of the incident portion 321 further have a light incident surface 321 a , and the light emitting element 31 faces the light incident surface 321 a of the incident portion 321 of the light guide element 32 . Therefore, when the light-emitting element 31 emits light, the light enters the light-guiding element 32 from the light incident surface 321 a. The emitting part 322 has a light emitting surface 322a, and the light can be continuously reflected and guided from the light guide member 32, and then emitted outward through the light emitting surface 322a. In this example. The area of the light incident surface 321a is smaller than the area of the light exit surface 322a, so that the light can be concentrated and guided to effectively produce uniform and clear images. In this embodiment, viewed from the direction shown in the figure, the material of the light guide 32 is a transparent plastic and the light guide 32 is an inverted tapered structure. In other embodiments, the light guide member 32 is made of other materials that can transmit light, such as glass. In the present invention, the light guide member 32 is used to receive the light emitted by the light emitting member 31 from the light incident surface 321a. The light emitting surface 322a emits light. Then, the light is emitted to an object (such as a desktop) along an illumination path (not shown) through the exit 421 , so that a bright surrounding light spot is formed on the object. That is to say, by virtue of the inverted cone and ring structure of the light guide 32 and the area of the light incident surface 321a being smaller than the area of the light exit surface 322a, the light can be concentrated and guided so that the light emitted from the light emitting element 31 along the The illumination path converges to form a surrounding light spot on the object to produce a uniform and clear image.

In the present invention, "irradiation path" is defined as the travel path of the light emitted by the light-emitting element 31 after it converges and exits from the light-guiding element 32 , and the light is projected to the object.

In this embodiment, the lens 33 is disposed in the through hole 323 and has an object side 331 and an image side 332 . In this embodiment, the lens 33 is interposed on the light guide 32 . The lens 33 is used to receive the reflected light and guide it to the sensing element 34 so that the sensing element 34 receives the reflected light to form an image. In detail, after the light hits the object, a surrounding light spot is formed on the object, and at the same time, the surrounding light spot of the object generates a reflected light (not shown), so that the reflected light again sequentially passes through the exit 421 of the detachment part 42 and the second opening 323b enters into the optical sensing device 30 . Afterwards, the reflected light passes through the lens 33 , and the reflected light is guided to the sensor 34 for imaging through the lens 33 . Moreover, the material of the lens 33 is plastic or glass that can transmit light, and the object side 331 and the image side 332 of the lens 33 are convex, but the location, material and shape are not intended to limit the present invention. In addition, in this embodiment and some other embodiments, if the lens 33 is disposed between the second opening 323b and the sensing element 34 and adjusted accordingly, the effect of imaging can be achieved. Furthermore, according to actual needs, the object side 331 and the image side 332 of the lens 33 can be flat, concave or convex.

The sensing element 34 is located at the first opening 323a. The sensor 34 has an image capturing path C, and the sensor 34 is used to capture the reflected light from the lens 33 through the image capturing path C. The sensor 34 then converts the image into a digital signal and transmits it to the circuit board assembly 20 . In the present invention, the “image capturing path C” is defined as the path along which the reflected light reflected by the object is guided from the lens 33 to the sensor 34 .

It should be noted that, in the present invention, the illumination path and the imaging path C tend to be coaxial. "Tends to be coaxial" in the present invention is defined as the intersection angle between the illumination path and the imaging path C is extremely small, and when the inclination angle of the pen-shaped optical sensing device is changed, the deviation of the surrounding light spot from the imaging path C is extremely small.

In the present invention, the axis A and the alignment path C form an acute angle Θ (for example, 30 degrees). In this way, when the pen-type optical sensing device 1 is used on an object so that the pen holder 10 has an included angle ΘA (for example, 45 degrees) with the normal line of the object, then the orientation path C intersects with the normal line of the object at an angle ΘB (that is, ΘB is equal to ΘA minus Θ, 45 degrees minus 30 degrees equals 15 degrees). In this way, the variation of the orientation path C is small (15 degrees compared to 45 degrees), and the variation of the light spot generated by the optical sensing device 30 is also small, so that the pen-shaped optical sensing device 1 still has good illumination uniformity and can A good and clear image is obtained. In this way, in the present application, the inclination angle between the pen-shaped optical sensing device 1 and the object can be greatly enlarged, so that the pen-shaped optical sensing device 1 can be used more flexibly. Furthermore, the above-mentioned acute angle Θ can be any angle less than 90 degrees and greater than 0 degrees, which can achieve the effect of this application.

However, in the above-mentioned embodiment, the number of the light emitting element 31 of the optical sensing device 30 is one, but the number is not intended to limit the present invention. In other embodiments, please refer to FIG. 4 , which is a schematic cross-sectional view of an optical sensing device according to another embodiment of the present invention. The structure of this embodiment is similar to that of the above-mentioned embodiments, so the similarities will not be repeated here. In this embodiment, the optical sensing device 30 includes two light emitting elements 31 respectively disposed on the micro circuit board 35 and facing opposite ends of the incident portion 321 of the light guide element 32 . In this way, brighter illumination can be obtained while maintaining the same volumetric shape. In other embodiments, the number of light-emitting elements 31 is more than two, which can increase the light-emitting brightness of the optical sensing device 30 .

In other embodiments, the optical sensing device 30 further includes a support (not shown), one end of which is fixed to the micro circuit board 35, and the other end is located in the through hole 323 between the light guides 32, the support is used for The lens 33 is fixed so that the lens 33 is firmly disposed between the sensing element 34 and the second opening 323b.

Please refer to FIG. 5A, FIG. 5B, FIG. 5C, FIG. 6A, FIG. 6B and FIG. 6C at the same time, wherein FIG. 5A is a brightness distribution diagram of a pen-shaped optical sensing device according to an embodiment of the present invention, and FIG. 5B is FIG. 5A The luminance distribution diagram along the Y-axis coordinate 0, FIG. 5C is the luminance distribution diagram along the X-axis coordinate 0 in FIG. 5A, FIG. The luminance distribution diagram of Y-axis coordinate 0, FIG. 6C is the luminance distribution diagram of FIG. 6A along the X-axis coordinate 0. Among them, the pen-shaped optical sensing device is aimed at an object (this test is a photosensitive element) to present a sensing area, and the units of the horizontal axis and the vertical axis are millimeters (the width of the horizontal axis is 1 mm, and the length of the vertical axis is 1 mm). The figures in the middle are the luminance divisions irradiated on the sensing area by the pen-shaped optical sensing device of the present application and the prior art respectively. In addition, the picture on the left is a brightness comparison chart. Figure 5B refers to the horizontal brightness distribution diagram passing through the sensing area along the Y-axis coordinate 0 point, and Figure 5C refers to the vertical brightness passing through the sensing area along the X-axis coordinate 0 point Distribution. From Figure 6A to Figure 6C, the optical sensing device in the prior art has uneven brightness (illuminance, unit lux), and the average difference (V) is 0.43149 (the lower the average difference, the higher the uniformity) and The maximum brightness area is to the right and not in the center of the sensing area. In this way, the sensing element cannot obtain good imaging. Compared with the optical sensing device of this case shown in FIG. 5A , its brightness is uniform, the average difference is 0.21538, and the maximum brightness is also in the center of the sensing area, which is obviously better than the existing optical sensing device. Therefore, the sensing element can obtain accurate and stable imaging. That is, the pen-shaped optical sensing device of the present invention can detect more accurate image variation, thereby improving the sensitivity of the pen-shaped optical sensing device.

The following introduces the comparison of the brightness and clarity of the pen-shaped optical sensing device in this case and the pen-shaped optical sensing device in the prior art at different inclinations. In this experiment, the included angle between the axial direction of the pen holder of the pen-shaped optical sensing device of this case and the imaging path is set to be 30 degrees, and the distance between the pen holder of this case and the existing pen-shaped optical sensing device relative to the sensing area The normal's tilt angle is 55 degrees.

As shown in Fig. 7A and Fig. 7B, Fig. 7A is a simulated analysis diagram of sharpness (MTF) (or optical modulus function (Modulation Transfer Function, MTF)) of a pen-type optical sensing device according to an embodiment of the present invention. Graph), FIG. 7B is a simulation analysis diagram of sharpness (MTF) of a pen-type optical sensing device in the prior art, and the horizontal axis in the diagram represents the number of cycles of the spatial frequency per millimeter (Spatial Frequency in Cycles per mm, the unit is line-pair/mm), and the vertical axis represents the modulus of the optical modulus function (Modulus of Modulation Transfer Function). Comparing FIG. 7A and FIG. 7B , it can be easily seen that the resolution (or definition) of the imaging in the vertical direction (T) and horizontal direction (S) of each field of view is significantly better than that of the prior art.

In addition, as shown in FIG. 8A, FIG. 8B, FIG. 8C, FIG. 9A, FIG. 9B and FIG. 9C, FIG. 8A is a luminance distribution diagram of the pen-shaped optical sensing device of FIG. 7A, and FIG. 8B is a graph of FIG. 8A along the Y axis The brightness distribution diagram of coordinate 0, FIG. 8C is the brightness distribution diagram of FIG. 8A along the X-axis coordinate 0, FIG. 9A is the brightness distribution diagram of the pen-shaped optical sensing device of FIG. 7B, and FIG. 9B is the brightness distribution diagram of FIG. 5A along the Y-axis coordinate 0 As for the luminance distribution diagram, FIG. 9C is a luminance distribution diagram along the X-axis coordinate 0 in FIG. 5A . It can be seen from the diagram that the illumination uniformity of this case is better (the average difference of this case is 0.242, and the prior art is 0.742). In addition, the maximum brightness area of this case is slightly lower left, and the maximum brightness area of the prior art pen-type optical sensing device is obviously far away from the center point.

In addition, in another experiment, the included angle between the axial direction of the pen holder of the pen-shaped optical sensing device of this case and the imaging path is set to be 45 degrees, and this case is compared with the pen holder of the existing pen-shaped optical sensing device. The inclination angle of the normal of the sensing area is 70 degrees.

As shown in Fig. 10A and Fig. 10B, Fig. 10A is a clear view of the angle between the axis of the pen shaft and the imaging path at 45 degrees and the axis between the axis and the normal line of the object at 70 degrees in a pen-type optical sensing device according to another embodiment of the present invention. 10B is a simulated analysis diagram of the sharpness (MTF) of another pen-shaped optical sensing device in the prior art with a 70-degree angle between the axial direction and the normal of the object. It can be seen from the figure that, compared with the experimental differences shown in FIG. 7A and FIG. 7B , the resolution of the pen-shaped optical sensing device in this case is better than that of the prior art. That is to say, when the inclination angle is larger, the resolution of the prior art will be worse, while the degradation of the imaging quality of the pen-shaped optical sensing device provided in this application is obviously smaller.

In addition, as shown in Figure 11A, Figure 11B, Figure 11C, Figure 12A, Figure 12B and Figure 12C, Figure 11A is a brightness distribution diagram of a pen-shaped optical sensing device according to another embodiment of the present invention, and Figure 11B is a graph of Figure 11B The luminance distribution diagram along the Y-axis coordinate 0, FIG. 11C is the luminance distribution diagram along the X-axis coordinate 0 in FIG. The luminance distribution diagram of coordinate 0 on the Y-axis, FIG. 12C is the distribution diagram of luminance along the coordinate 0 of the X-axis in FIG. 12A . It can be seen from the diagram that the illumination of this case is relatively uniform (the average difference of this case is 0.242, and that of the prior art is 0.79). In addition, in this case, the deviation distance of the maximum brightness area is relatively small. The maximum brightness area of the prior art pen-type optical sensing device is obviously far away from the original center point when it is not tilted.

To sum up the above, in the pen-shaped optical sensing device disclosed in the present invention, since the axial direction of the pen holder forms an acute angle with the imaging path of the optical sensing device, and the irradiation path and the imaging path of the optical sensing device tend to be coaxial, so , when the user tilts the pen-type optical sensing device at a large angle, the optical sensing device can still obtain images with better uniformity and clear imaging, and maintain the sensitivity and smoothness of the pen-type optical sensing device when used, and can improve The operating angle range of the pen-type optical sensing device. In addition, the pen-type optical sensing device can be applied to various smooth and rough working surfaces, such as palms, books or desktops. Therefore, the present invention solves the problem of insensitivity of the pen-type optical sensing device in the prior art due to uneven brightness and poor imaging (low MTF value) in the wide-angle range.

Furthermore, compared with the prior art where there is an acute angle between the incident light and the reflected light, which results in a larger volume, the pen-shaped optical sensing device of this case has the same axis as the emission path of the light and the imaging path of the reflected light, thus enabling The size is greatly reduced. In addition, since the area of the light incident surface of the light guide is smaller than the area of the light exit surface, the light can be concentrated and guided to produce a uniform and clear image.

Certainly, the present invention also can have other various embodiments, without departing from the spirit and essence of the present invention, those skilled in the art can make various corresponding changes and deformations according to the present invention, but these corresponding changes All changes and modifications should belong to the protection scope of the claims of the present invention.

Claims (7)

1. a kind of pen type optical sensing apparatus, it is characterised in that include：

One penholder, along an axially extending setting；

One circuit board assemblies, in the penholder；And

One optical induction device, located at one end of the penholder and the circuit board assemblies are electrically connected with, the optical induction device includes：

An at least illuminating part, to launch a light；

One light guide, has an incident section relative to each other and an exit portion, and the incident section has an incidence surface, exit portion tool There is an exiting surface, the light emitted by an at least illuminating part enters the light guide from the incidence surface and penetrated from the exiting surface Go out, wherein the area of the incidence surface is less than the area of the exiting surface, and the light enters the leaded light by the less incidence surface of area Part, and constantly reflect and guide in the light guide, then faced out by the larger light extraction of area along an exposure pathways to one Object,

To form bright hot spot, the reflected light of object reflection one；

One lens, to guide the reflected light；And

One induction pieces, there is a capture path, the induction pieces are to via the reflection of capture path acquisition from the lens Light, and the exposure pathways tend to be coaxial with the capture path, the axial direction accompanies an acute angle with the capture path.

2. pen type optical sensing apparatus according to claim 1, it is characterised in that the light guide, which has, penetrates the incident section With a through hole of the exit portion, the through hole has one first opening and one second opening, and at least an illuminating part is located at for this At the incident section, the induction pieces to should first opening.

3. pen type optical sensing apparatus according to claim 1, it is characterised in that the width of the incident section is more than the outgoing The width in portion.

4. pen type optical sensing apparatus according to claim 1, it is characterised in that when the quantity of an at least illuminating part is When two, two illuminating part is respectively arranged at the opposite end of the incident section of the light guide.

5. pen type optical sensing apparatus according to claim 2, it is characterised in that further include a written portion, be arranged at this Outside optical induction device, the written portion has an outlet, corresponding to second opening of the through hole.

6. pen type optical sensing apparatus according to claim 1, it is characterised in that there is an accommodation space in the penholder, The circuit board assemblies are arranged in the accommodation space, and the optical induction device is located at one end of the accommodation space.

7. pen type optical sensing apparatus according to claim 1, it is characterised in that the circuit board assemblies include a power supply mould Block and a radio receiving transmitting module, and an at least illuminating part is a light-emitting diode (LED) module.