Hand shadow-free desktop far image reading and writing device

Abstract

The utility model discloses a kind of hand shadow-eliminating desktop far image reading and writing equipment, at least including spectroscope and reflector, for the amplification far image of desktop reading and writing area, further comprising: main light supplement lamp, respectively set in the back of the two side frames of spectroscope and present strip shape distribution;The back of light shield is provided with one or more of first auxiliary light supplement lamp, second auxiliary light supplement lamp and third auxiliary light supplement lamp;Hand shadow-eliminating lamp is set between spectroscope and backplate;When hand shadow-eliminating lamp is opened, main light supplement lamp, first auxiliary light supplement lamp, second auxiliary light supplement lamp, third auxiliary light supplement lamp are all opened and the brightness is all adjusted to its corresponding desktop illuminance is lower than the corresponding desktop illuminance of hand shadow-eliminating lamp.The desktop far image reading and writing equipment, by setting main light supplement lamp, multiple auxiliary light supplement lamps and hand shadow-eliminating lamp, carry out partition illumination, then, by adjusting the brightness of each light supplement lamp, reach synergic illumination effect, can improve the uniformity of desktop illuminance, and eliminate the shadow caused by hand.

Description

Technical Field

[0001] This utility model relates to a desktop remote image reading and writing device that eliminates hand shadows. Background Technology

[0002] The problem of myopia among teenagers is becoming increasingly serious. The root cause is that teenagers' eyes spend most of their time focusing on close-up objects, causing their eyeballs to gradually lengthen in order to adapt to near-field imaging. To address this issue, various myopia prevention and control products have emerged on the market. Among them, desktop distance vision reading and writing devices use optical means to extend the near-field reading and writing to a distant imaging distance, and are widely used in the field of myopia prevention and control among teenagers.

[0003] Traditional box-type reading and writing desks have relatively less hand shadow problem because light strips can be installed on all four sides of the bottom of the cabinet. Folding reading and writing desks are popular because they take up less desktop space, but their thin design often means that light strips can only be installed on two or three sides, resulting in a more serious hand shadow problem and poor illumination uniformity. Since hand shadows can worsen the shadows around the pen tip, making it difficult to see and reducing learning efficiency; and they can also increase the local contrast of the image entering the eye, which is detrimental to myopia management, there is a need to improve desktop far-image reading and writing devices to eliminate hand shadows. Summary of the Invention

[0004] The technical problem to be solved by this utility model is to provide a desktop remote image reading and writing device that eliminates hand shadows. It uses multiple light sources to simultaneously illuminate the desktop reading and writing area and controls the desktop illuminance of each light source to eliminate hand shadows and achieve uniform supplemental lighting for the desktop writing area.

[0005] To achieve the above-mentioned technical objectives, the present invention adopts the following technical solution:

[0006] A shadowless desktop image reading and writing device, comprising at least a beam splitter and a reflector for presenting a magnified image of the desktop reading and writing area, further comprising:

[0007] The main fill lights are respectively set on the back of the two side frames of the beam splitter and distributed in a strip shape, and are used to project light onto the desktop reading and writing area when the beam splitter is tilted.

[0008] A light-shielding plate is placed at the end of the beam splitter, and one or more of a first auxiliary fill light, a second auxiliary fill light, and a third auxiliary fill light are provided on the back of the light-shielding plate for supplementing light to different local areas of the desktop reading and writing area.

[0009] The back panel is vertically mounted and its top is rotatably connected to the top of the beam splitter.

[0010] The hand-illuminating lamp is positioned between the beam splitter and the back panel to provide supplemental lighting to the desktop reading and writing area;

[0011] When the shadow removal lamp is turned on, the main fill light, the first auxiliary fill light, the second auxiliary fill light, and the third auxiliary fill light are all turned on and their brightness is adjusted so that the corresponding desktop illuminance is lower than the desktop illuminance corresponding to the shadow removal lamp.

[0012] Preferably, the first auxiliary fill light is located in the middle of the back of the light shield and is used to provide supplementary lighting for the area of ​​the desktop reading and writing area close to the user;

[0013] The angle between the main beam of the first auxiliary fill light and the light shield is between 70° and 90°.

[0014] Preferably, the second auxiliary fill light is set at a higher height than the first auxiliary fill light. The second auxiliary fill light is located in the middle of the back of the light shield and is used to provide supplementary lighting to the area of ​​the desktop reading and writing area away from the user.

[0015] The angle between the main beam of the second auxiliary fill light and the light shield is between 90° and 110°.

[0016] Preferably, the third auxiliary fill light is located on both sides of the back of the light shield and is used to provide supplementary lighting to the area of ​​the desktop reading and writing area closer to the user; the angle between the main light of the third auxiliary fill light and the light shield is between 40° and 50°.

[0017] Preferably, the hand-shadow lamp is located in the connection area between the top of the beam splitter and the top of the back plate, and is used to provide supplementary lighting to the desktop reading and writing area at an angle.

[0018] Preferably, the angle between the main light beam of the hand-shadow lamp and the back plate is between 15° and 30°.

[0019] Preferably, the shadow lamp, the main fill light, the first auxiliary fill light, the second auxiliary fill light, and the third auxiliary fill light are respectively connected to the motherboard.

[0020] Preferably, the frames of the light-shielding plate and the beam splitter are respectively provided with power interfaces to enable the circuit systems of the first auxiliary fill light, the second auxiliary fill light, the third auxiliary fill light, and the desktop image reading and writing device to be connected.

[0021] Preferably, when the shadow puppet light is turned on, the ratio of the driving current of the shadow puppet light to the driving current of other light strips is between 2.5 and 5.

[0022] Preferably, the hand shadow removal desktop image reading and writing device further includes: a cover plate, which can rotate 90° relative to the back plate, and the reflector is disposed on the side of the cover plate or the back plate facing the human eye; an additional function plate, disposed on the side of the back plate or the cover plate facing the human eye, and located on both sides of the beam splitter, respectively, along with the reflector; the additional function plate is used to provide light to a local area of ​​the human eye through display, reflection, or scattering.

[0023] The hand shadow elimination desktop image reading and writing device provided by this utility model sets a main supplementary light on the back of the side frames of the beam splitter, adds multiple sets of supplementary lights in the light shield below the beam splitter, and sets a hand shadow elimination light between the beam splitter and the back plate. Then, by adjusting the brightness of each supplementary light, the projection position of the light is precisely controlled to achieve zoned lighting, which can improve the uniformity of desktop illumination and further eliminate shadows caused by hands. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the imaging optical path of a desktop image reader / writer;

[0025] Figure 2 This is a three-dimensional structural diagram of a desktop image reading and writing device;

[0026] Figure 3 This is a schematic diagram of the exploded structure of a desktop image reading and writing device;

[0027] Figure 4 A schematic diagram of the lighting system for a desktop image reading / writing device;

[0028] Figure 5 A three-dimensional structural diagram of a desktop image reading and writing device;

[0029] Figure 6 This is a schematic diagram of the main rays of each light source in the lighting system;

[0030] Figure 7 This is a schematic diagram showing the illumination range of the main supplement light and the shadow lamp in the lighting system;

[0031] Figure 8 This is a schematic diagram showing the illumination range of the first, second, and third auxiliary supplementary lights in the lighting system. Detailed Implementation

[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0033] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0034] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0035] This application proposes a new integrated design method for the layout, control and structure of light strips, which realizes the design of three-dimensional layout and independent control of light strips, and reduces hand shadows in all aspects.

[0036] like Figures 1 to 5 As shown, the desktop remote image reading and writing device (also known as a reading and writing table) provided by this utility model is a device that uses optical means to extend the near-distance reading and writing on the desktop to a distant image. It includes a Birdbath-type imaging optical path composed of at least a beam splitter 103 and a reflector 104, which is used to present a magnified remote image of the desktop reading and writing area 100. The size of the desktop reading and writing area 100 is determined by the size of the reflector 104 and the beam splitter 103. Currently, some products can achieve a desktop reading and writing area the size of two A4 or A3 sheets of paper.

[0037] Specifically, the desktop far-viewing and writing device provided by this utility model includes a coaxial optical path composed of a planar beam splitter 103 and a concave reflector 104. The concave reflector 104 reflects light rays from the desktop (e.g., light reflected from objects placed on the desktop and light emitted from a monitor placed on the desktop), achieving image magnification and projection. The planar beam splitter 103 folds the optical path, thus achieving magnified and projected desktop writing in a compact device, allowing for extended viewing at a distance. Furthermore, a folding structure is provided to reduce the size of the desktop far-viewing and writing device when not in use.

[0038] This utility model provides an exemplary structure for a foldable desktop image reading and writing device, such as... Figure 2 and Figure 3 As shown, it includes: a bracket 101, a back plate 102, a plane beam splitter 103, a concave mirror 104, a cover plate 105, and a damping pivot. The bracket 101 is set on a table, the back plate 102 is connected to the bracket 101, and the distance between the back plate 102 and the table can be adjusted. The back plate 102, the plane beam splitter 103, and the cover plate 105 are rotatably connected by the damping pivot. The plane beam splitter 103 and the cover plate 105 can be rotated to a folded state parallel to the back plate 102.

[0039] In this foldable desktop image reading and writing device, one end of the cover plate 105, one end of the back plate 102, and the top end of the planar beam splitter 103 are respectively fixed to the cover plate fixing frame, the back plate fixing frame, and the planar beam splitter fixing frame of the damping shaft; the concave reflector 104 is fixedly mounted on the cover plate 105 or the back plate 102, and the concave reflector 104 is held in a horizontal or vertical position during use; Figure 1 In this embodiment, the concave reflector 104 is fixedly disposed on the lower surface of the cover plate 105. In other embodiments, the concave reflector can also be fixedly disposed on the surface of the back plate 102 facing the exit pupil. The concave reflector can be fixedly disposed on either the cover plate 105 or the back plate 102 to achieve distant image imaging for desktop writing. The planar beam splitter 103 is tilted between the cover plate 105 and the back plate 102 during use. Light reflected from the desktop and objects placed on it is directed from below to the planar beam splitter 103 and then split. The light is then directed to the concave reflector 104, reflected by the concave reflector 104, and split again by the planar beam splitter 103 before being directed towards the exit pupil, forming a distant image at a distance of at least 3 meters.

[0040] In addition, to improve the myopia prevention effect of the desktop far-image reading and writing device, the desktop far-image reading and writing device also includes an additional function board 111, which is disposed on the side of the back plate 102 or the cover plate 105 facing the human eye, and is located on both sides of the beam splitter 103, respectively, along with the reflector 104. The additional function board 111 is used to provide light to a local area of ​​the human eye by displaying, reflecting or scattering light, thereby changing the contrast of the local area of ​​the far image.

[0041] In this desktop far-viewing reading and writing device, a planar beam splitter 103 is required to fold the optical path, but the planar beam splitter 103 causes light loss and reduces luminous efficiency. In order not to affect the brightness entering the eye, an illumination system (generally a full-spectrum light source) is often required in the desktop far-viewing reading and writing device. The illumination system can illuminate the desktop, increase the reflected illuminance, and thus increase the brightness entering the eye after passing through the beam splitter. In the folding desktop far-viewing reading and writing device, the illumination system usually includes a main supplementary light 121 set in the frame 106 of the beam splitter 103 (for example, main supplementary lights 121a and 121b respectively set on the back of the two side frames of the beam splitter or supplementary lights set in the lower frame of the beam splitter), or supplementary lights set in the lower frame of the back panel 102 to project light onto the desktop reading and writing area when the beam splitter is tilted.

[0042] However, since the lighting source is only set on one or both sides of the desktop image reading and writing device, the uniformity of desktop illumination is affected as the desktop reading and writing area increases. Moreover, when the current reading and writing table product is used in writing scenarios, the user's hand will block the light shining on the desktop, thus creating shadows around the hand. In particular, the shadow on the inside of the hand causes the local contrast of the user's viewing of the image to be too high, which can easily cause eye fatigue and other adverse consequences. It also has a significant impact on the user's writing and affects the user's experience.

[0043] To eliminate shadows caused by hands in the distant image, the foldable desktop distant image reader / writer was modified by adding a hand-shadow removal lamp 125 between the back panel 102 and the beam splitter 103. Figure 5 As shown, the hand-extinguishing lamp 111 is located in the connection area between the top of the back panel 102 and the top of the beam splitter 103, and is used to provide supplementary lighting to the desktop reading and writing area at an angle.

[0044] To prevent stray light from abnormal optical paths from entering the user's field of vision and to prevent the user from directly viewing objects placed on the desktop, foldable desktop image reading and writing devices are often equipped with a light shield 107 (also called a privacy screen) located at the end of the beam splitter 103. By setting various types of auxiliary lights on the light shield 107 below the beam splitter 103, an auxiliary lighting system is formed, which can improve the lighting conditions of the desktop reading and writing area. This application provides structural schematic diagrams of three auxiliary light strips, further illustrating the specific details of these embodiments. This solution can not only effectively eliminate shadows caused by hands, but also significantly improve the illumination uniformity of the imaging device.

[0045] According to the embodiments provided by this utility model, such as Figures 4 to 6 As shown, the auxiliary lighting system of this foldable desktop far-viewing reader / writer includes a first auxiliary fill light 122 mounted on a light shield 107 below the beam splitter 103. The center ray of the first auxiliary fill light 122 is approximately perpendicular to the beam splitter 103, and the angle between the main ray of the first auxiliary fill light 122 and the beam splitter 103 is between 70° and 90°, used to provide supplementary lighting to the central area of ​​the reading / writing area closer to the user. The auxiliary lighting system of this foldable desktop far-viewing reader / writer also includes a second auxiliary fill light 123 mounted in the middle of the light shield 107 below the beam splitter 103. The second auxiliary fill light 123 is positioned higher than the first auxiliary fill light 122, and the angle between the main ray of the second auxiliary fill light 123 and the beam splitter is between 90° and 110°, used to provide supplementary lighting to the central area of ​​the reading / writing area farther from the user. The auxiliary lighting system of the foldable desktop far-view reading and writing device also includes third auxiliary fill lights 124 on both sides of the back of the light shield 107 below the beam splitter 103. The main beam of the third auxiliary fill light 124 is at an angle of 40° to 50° with the beam splitter 103, and is used to provide supplementary lighting to the areas on both sides of the reading and writing area closer to the user.

[0046] In non-writing mode, the aforementioned foldable desktop far-viewing reading and writing device can illuminate the desktop by turning on only the main fill light 121, the first auxiliary fill light 122, the second auxiliary fill light 123, and the third auxiliary fill light 124 located on the back of the beam splitter 103, achieving good uniformity of illumination. In writing mode, the shadow removal lamp 125 is turned on simultaneously, combined with other fill lights (including the main fill light 121, the first auxiliary fill light 122, the second auxiliary fill light 123, and the third auxiliary fill light 124 located on the back of the beam splitter 103), achieving a shadow removal effect while illuminating the desktop. In non-writing mode, the shadow removal lamp 125 can be turned off independently.

[0047] The following is combined with Figures 6 to 8The specific lighting principle of this embodiment is illustrated. Referring to the open state of the foldable desktop far-view reading and writing device, the beam splitter 103 is rotated to an open state where the angle between it and the back panel 102 is between 35° and 55°, and the cover plate 105 is rotated to an open state where the angle between it and the back panel 102 is between 90°. The hand shadow lamp 125 is disposed between the back panel 102 and the beam splitter 103. The hand shadow lamp 125 is tilted, and the angle between the main light beam a of the hand shadow lamp 125 and the back panel 102 is between 15° and 30°. The main light beam a of the hand shadow lamp 125 is directed towards the center of the desktop writing area, and the illumination range covers the entire writing area. The main fill light 121 disposed on the back of the side frames of the beam splitter 103 has an angle of approximately 45° with the beam splitter 103; it is used to provide illumination to the area below the main fill light 121 (corresponding to the two sides of the desktop reading and writing area away from the user) when the beam splitter 103 is open. The first auxiliary fill light 122, the second auxiliary fill light 123, and the third auxiliary fill light 124, located on the back of the light shield below the beam splitter 103, provide supplementary lighting to the central area, the two side areas of the desktop reading / writing area near the user, and the central area away from the user, respectively. By simultaneously turning on the main fill light 121, the first auxiliary fill light 122, the second auxiliary fill light 123, and the third auxiliary fill light 124, uniform illumination can be provided to the desktop reading / writing area. Furthermore, turning on the shadow-eliminating light 125 provides superimposed illumination across the entire desktop reading / writing area, achieving a shadow-eliminating effect while ensuring uniform illumination.

[0048] Specifically, such as Figure 7 and Figure 8 As shown, in non-shadow removal mode, the main fill lights (121a and 121b) on both sides of the beam splitter, the fill lights (122, 123, 124a and 124b) at the light shield, and the shadow removal light 125 are turned on. The main fill lights 121a and 121b emit light c, d and c', d' (light divergence angle less than 50°) from different step heights to illuminate the left and right sides of the desktop reading and writing area away from the user; the first auxiliary fill light 122 at the center of the back of the light shield emits light i and j (light divergence angle approximately 37°±5°) to illuminate the desktop reading and writing area near the user. The second auxiliary fill light 123, located in the center of the back of the light shield, emits light g and h (with a divergence angle of approximately 20°±5°) to illuminate the reading and writing area on the desktop, away from the center of the user side. The third auxiliary fill lights 124a and 124b on both sides of the back of the light shield emit light e, f and e', f' (with a divergence angle of approximately 35°±5°) to illuminate the left and right sides of the reading and writing area on the desktop, closer to the user side. This completes the illumination of the book in reading mode, with an overall uniformity of approximately 1.4 (maximum illuminance / minimum illuminance on the book).

[0049] Shadow Elimination Mode: Simultaneously turn on the shadow elimination lamp 125. The entire light strip of the shadow elimination lamp 125 is tilted at a certain angle to the back panel. The shadow elimination lamp 125 emits light rays a and b (with a light divergence angle of approximately 40°±5°) to illuminate the entire desktop reading and writing area, thus providing supplementary lighting from the front towards the area below the hand, thereby eliminating hand shadows. When all lights are on, the brightness of the shadow elimination lamp is significantly higher than other supplementary lights, resulting in a higher desktop illuminance corresponding to the shadow elimination lamp. For example, the optimal shadow elimination state can be achieved by adjusting the driving current ratio of the shadow elimination lamp 125 to other light strips to 2.5 to 5 times (basically equivalent to the shadow elimination lamp power divided by the reading mode light strip power).

[0050] According to the embodiment provided by this utility model, a motherboard is installed inside the back plate 102. The motherboard is connected to the Hall switch, the distance sensor, and all the auxiliary lights (main auxiliary lights 121 on both sides of the back of the beam splitter, first auxiliary auxiliary lights 122, second auxiliary auxiliary lights 123 and third auxiliary auxiliary lights 124 below the beam splitter, and shadowless light 125 between the back plate and the beam splitter) via wires. It receives the switching signals from the distance sensor and the Hall switch and controls the switching of all the auxiliary lights. In this embodiment, the motherboard can use the CH32V203C8T6 low-power microcontroller, which has low power consumption, built-in 20KB SRAM and 64KB Flash storage space, and provides dual USB 2.0 full-speed host / device interfaces, 1 CAN interface, 4 UARTs, 2 IICs, and 2 SPI interfaces. The Hall switch can use the A3144EUA-T type unipolar Hall effect switch sensor, with a wide operating voltage range of 4.5~24VDC, open collector digital output, and low response time. In this embodiment, the distance sensor operates at a voltage of 5–24V DC and has a sensing range of 5–20cm. The main board receives the switch signal from the distance sensor and controls the switch of the fill light.

[0051] According to the embodiments provided by this utility model, such as Figures 3-5As shown, the lighting system of this foldable desktop far-viewing reading and writing device includes main fill lights 121 located on the back of the side frames 106 of the beam splitter 103, and multiple auxiliary fill lights 122, 123, and 124 and a shadow-reducing light 125 located on the back of the light shield 107 below the beam splitter 103. Power interfaces 108 and 109 (e.g., POGOPIN connectors) are correspondingly provided at the contact points between the beam splitter 103 and the light shield 107, enabling communication between the multiple fill lights on the light shield 107 and the main board. Unlike traditional light shields, which are typically pure structural components made of plastic or sheet metal, the light shield provided in this application achieves an integrated optical, mechanical, and electrical design by integrating fill light strips. The manufacturing process of this light shield can include hot pressing, sheet metal processing, injection molding, or compression molding, to adapt to different production requirements and structural strengths.

[0052] For power supply, this solution preferably draws power from the lower edge of the beam splitter frame via a POGOPIN connector or other equivalent method. A safe voltage is used to ensure safety during use. Preferably, POGOPIN connectors are arranged on both sides of the frame, or a multi-pin POGOPIN connector is arranged on one side. In addition to power supply, this connection scheme can also be used for contact or continuity determination. When the connectors on both sides are not fully connected, the system automatically cuts off the power, thus providing maximum safety for users (especially children).

[0053] Furthermore, the shadow removal lamp can be individually controlled, for example, via a touchscreen interface or physical buttons. When the shadow removal function is activated, the brightness of the shadow removal lamp and other light sources are controlled collaboratively according to usage. Specifically, the motherboard can automatically set the corresponding illuminance of each fill light and the shadow removal lamp based on preset fill light illuminance values, so that the desktop illuminance corresponding to other fill lights is lower than that corresponding to the shadow removal lamp, achieving overall lighting balance and eliminating shadows caused by hands blocking the light source.

[0054] The foregoing has provided a detailed description of the hand shadow removal desktop image reading and writing device provided by this utility model. Any obvious modifications made by those skilled in the art without departing from the essential content of this utility model will constitute an infringement of the patent rights of this utility model and will incur corresponding legal liability.

Claims

1. A desktop image reading and writing device for eliminating hand shadows, the desktop image reading and writing device comprising at least a beam splitter and a reflector for presenting a magnified image of the desktop reading and writing area, characterized in that... Also includes: The main fill lights are respectively set on the back of the two side frames of the beam splitter and distributed in a strip shape, and are used to project light onto the desktop reading and writing area when the beam splitter is tilted. A light-shielding plate is placed at the end of the beam splitter, and one or more of a first auxiliary fill light, a second auxiliary fill light, and a third auxiliary fill light are provided on the back of the light-shielding plate for supplementing light to different local areas of the desktop reading and writing area. The back panel is vertically mounted and its top is rotatably connected to the top of the beam splitter. The hand-illuminating lamp is positioned between the beam splitter and the back panel to provide supplemental lighting to the desktop reading and writing area; When the shadow removal lamp is turned on, the main fill light, the first auxiliary fill light, the second auxiliary fill light, and the third auxiliary fill light are all turned on and their brightness is adjusted so that the corresponding desktop illuminance is lower than the desktop illuminance corresponding to the shadow removal lamp.

2. The desktop image reading and writing device for eliminating hand shadows as described in claim 1, characterized in that: The first auxiliary fill light is located in the middle of the back of the light shield and is used to provide supplementary lighting for the area of ​​the desktop reading and writing area close to the user; The angle between the main beam of the first auxiliary fill light and the light shield is between 70° and 90°.

3. The hand shadow removal desktop image reading and writing device as described in claim 2, characterized in that: The second auxiliary fill light is set at a higher height than the first auxiliary fill light. The second auxiliary fill light is located in the middle of the back of the light shield and is used to provide supplementary lighting to the area of ​​the desktop reading and writing area away from the user. The angle between the main beam of the second auxiliary fill light and the light shield is between 90° and 110°.

4. The desktop image reading and writing device for eliminating hand shadows as described in claim 3, characterized in that: The third auxiliary fill light is located on both sides of the back of the light shield and is used to provide supplementary lighting to the area of ​​the desktop reading and writing area closer to the user; the angle between the main light of the third auxiliary fill light and the light shield is between 40° and 50°.

5. The desktop image reading and writing device for eliminating hand shadows as described in claim 1, characterized in that: The hand-shadow lamp is located in the connection area between the top of the beam splitter and the top of the back panel, and is used to provide supplementary lighting to the desktop reading and writing area at an angle.

6. The desktop image reading and writing device for eliminating hand shadows as described in claim 5, characterized in that: The angle between the main beam of the hand-shadow lamp and the back plate is between 15° and 30°.

7. The desktop image reading and writing device for eliminating hand shadows as described in claim 1, characterized in that: The shadow lamp, the main fill light, the first auxiliary fill light, the second auxiliary fill light, and the third auxiliary fill light are respectively connected to the motherboard.

8. The desktop image reading and writing device for eliminating hand shadows as described in claim 7, characterized in that: The light-shielding plate and the frame of the beam splitter are respectively provided with power interfaces to enable the circuit system of the first auxiliary fill light, the second auxiliary fill light, the third auxiliary fill light and the desktop image reading and writing device to be connected.

9. The desktop image reading and writing device for eliminating hand shadows as described in claim 1, characterized in that: When the hand shadow lamp is turned on, the ratio of the driving current of the hand shadow lamp to the driving current of other light strips is between 2.5 and 5.

10. The desktop image reading and writing device for eliminating hand shadows as described in claim 1, characterized in that... Also includes: A cover plate that can rotate up to 90° relative to the back plate, and a reflector disposed on the side of the cover plate or the back plate facing the human eye; An additional functional panel is disposed on the side of the back plate or the cover plate facing the human eye, and is located on both sides of the beam splitter, respectively, along with the reflector; the additional functional panel is used to provide light to a local area of ​​the human eye through display, reflection, or scattering.

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