Novel light guide plate structure
By setting the optical structure that changes the optical path and the side lighting of the linear light source on the transparent light guide plate, the problem of insufficient light illumination in the center of the product in the prior art is solved, a more uniform lighting effect is achieved, and the camera's precise capture ability of the product position is improved.
Patent Information
- Application Number
- CN202420537272.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-19
- Publication Date
- 2025-04-25
- Estimated Expiration
- 2034-03-19
AI Technical Summary
In the prior art, the direct light source causes the light illumination in the center of the product to be lower than the surrounding light illumination, affecting the camera's precise capture of the product position.
An optical structure that changes the light path is adopted on its surface. A linear light source is arranged on the side of the light guide plate, so that light rays are shot into the light guide plate from the side, and the optical structure changes the propagation path and emits from a specific surface area to achieve uniform illumination.
Through uniform lighting effects, the light illumination in the center of the product is avoided and the brightness of the surrounding light is lower than that of the surrounding light, and the camera's precise capture ability of the product position is improved.
Smart Images
Figure CN222798768U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of light guide plate structures, and in particular relates to a novel light guide plate structure. Background Art
[0002] With the development of the display industry, the market demand for large-size displays is increasing. The larger the display, the higher the requirements for the assembly process of assembling the modules of the display components.
[0003] In order to meet the market demand for large-size displays, more advanced and accurate automated installation equipment is required for module assembly process equipment. At present, automated installation equipment uses cameras to capture products on the assembly line (such as the component modules of the display) for product positioning and other inspections. At this time, it is necessary to arrange light sources around the camera to provide sufficient brightness for the camera's camera field of view on the assembly line, so that the camera can accurately capture, identify and locate the position of the product, determine the size and edge of the product, and then command the robotic arm of the automated installation equipment to accurately grasp and install the product.
[0004] However, in the prior art, direct light sources are usually arranged around transparent glass, so that the camera can view the assembly line downward through the transparent glass. In this way, the transparent glass mainly serves to provide a layer of physical protection for the camera to prevent dust pollution or other objects on the assembly line from suddenly colliding with the camera and causing damage to the camera. This structure that relies on a direct light source to illuminate the assembly line to provide lighting for the camera to capture the product will cause the central light intensity of the direct light source to be higher than the surrounding illumination. Since the light source lighting structure arranged around the transparent glass of a specific geometric shape will directly cause the central light illumination of the product to be lower than the surrounding light illumination, it is not conducive to the camera capturing the position of the product. Utility Model Content
[0005] The purpose of the utility model is to provide a novel light guide plate structure, which can provide more uniform lighting to products under the production line, so that the camera can capture the products more accurately.
[0006] The utility model provides a novel light guide plate structure, comprising: a transparent light guide plate, a linear light source;
[0007] The surface of the transparent light guide plate is provided with an optical structure for changing the light path;
[0008] The line light source is arranged on the side of the transparent light guide plate, so that the light emitted by the line light source is incident into the transparent light guide plate from the side of the transparent light guide plate;
[0009] The optical structure can make part of the light incident on the transparent light guide plate change its propagation path and then be emitted from a specific surface area of the transparent light guide plate.
[0010] Optionally, the optical structure includes: a first optical structure located on the upper surface of the transparent light guide plate.
[0011] Optionally, the first optical structure can cause part of the light incident on the transparent light guide plate to change its propagation path and then be emitted from a specified area on the lower surface of the transparent light guide plate.
[0012] Optionally, the optical structure further includes: a second optical structure located on the lower surface of the transparent light guide plate;
[0013] The second optical structure can make part of the light incident on the transparent light guide plate change its propagation path and then be incident on a designated area on the upper surface of the transparent light guide plate.
[0014] Optionally, both the first optical structure and the second optical structure are recessed dots formed by a hot pressing process.
[0015] Optionally, the first optical structure and the second optical structure are distributed alternately up and down.
[0016] Optionally, the number of the first optical structures and the number of the second optical structures tend to increase from the periphery to the center of the transparent light guide plate.
[0017] Optionally, the number of the first optical structures is greater than the number of the second optical structures.
[0018] Optionally, the transparent light guide plate is made of organic glass.
[0019] Optionally, the line light source is an LED light source.
[0020] It can be seen from the above technical solutions that the embodiments of the present application have the following advantages:
[0021] The novel light guide plate structure of this embodiment includes: a transparent light guide plate and a linear light source; wherein the surface of the transparent light guide plate is provided with an optical structure for changing the light path; the linear light source is arranged on the side of the transparent light guide plate, so that the light emitted by the linear light source enters the transparent light guide plate from the side of the transparent light guide plate; the optical structure can make part of the light entering the transparent light guide plate change its own propagation path and then be emitted from a specific surface area of the transparent light guide plate. It can be seen that this embodiment can control the position distribution of the optical structure on the transparent light guide plate, thereby controlling the emission of light from a specific surface area on the surface of the transparent light guide plate, so that the transparent light guide plate can convert the surrounding linear light sources into surface light sources, and using the surface light source to illuminate the products on the assembly line can achieve the effect of uniformly illuminating the products, and can avoid the situation where the brightness of the center light of the product is lower than the brightness of the surrounding light as in the prior art, which is conducive to the camera to capture the product more accurately. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] Figure 1 This is a schematic structural diagram of an embodiment of the light guide plate structure of the utility model;
[0023] Figure 2 It is a structural schematic diagram of another embodiment of the light guide plate structure of the utility model;
[0024] Figure 3 This is a schematic diagram of light path propagation in one embodiment of the guide plate light structure of the utility model;
[0025] Figure 4 It is a schematic structural diagram of an embodiment of a light guide plate structure in the prior art;
[0026] Figure 5 It is a structural schematic diagram of another embodiment of a light guide plate structure in the prior art. DETAILED DESCRIPTION
[0027] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.
[0028] It should be noted that the structure used in the prior art for camera lighting of products on the assembly line is as follows Figure 4 , Figure 5As shown, the camera 200 is shooting and framing the product 440 on the assembly line 430 downward through the transparent glass 410. In order to enable the camera 200 to clearly capture the product, a direct light source 420 is currently arranged around the transparent glass 410. The direct light source 420 has a plurality of lamps 421 that illuminate the assembly line 430 (conveyor belt) and the product 440 on the assembly line 430 (for example, the product 440 is a display panel of a display) downward, so that the camera 200 can clearly capture the image of the product 440 through the transparent glass 410; however, Figure 5 It can be seen that the light propagation path of the downwardly illuminated light from the multiple lamps 421 of the direct light source 420 is diffused outward from the emission surface of the lamp 421, which inevitably leads to the highest lighting brightness at the position directly below the multiple lamps 421 of the light source 420, and the lighting brightness at the surrounding positions gradually decreases. In addition, the light source 420 is arranged around the transparent glass 410, so when the product 440 on the assembly line 430 arrives directly below the camera 200, the central light brightness of the product 440 is lower than the surrounding light brightness, that is, the lighting falling on the product 440 is not uniform enough, and the brightness difference is too large, which is not conducive to the camera 200 to accurately capture the position of the product 440.
[0029] In order to make the light falling on the product 440 on the assembly line 430 more uniform and facilitate the camera 200 to accurately capture the position of the product 440, the utility model provides a new light guide plate structure, please refer to Figure 1 , Figure 2 as well as Figure 3 The novel light guide plate structure includes: a transparent light guide plate 110 and a linear light source 120; wherein the surface of the transparent light guide plate 110 is provided with an optical structure for changing the light path; the linear light source 120 is arranged on the side of the transparent light guide plate 110, and the light emitted by the linear light source 120 is incident into the transparent light guide plate 110 from the side of the transparent light guide plate 110, for example Figure 3 The incident light 1 and the incident light 2 shown in FIG. 1 are shown in FIG. 1 ; the optical structure can make part of the light incident on the transparent light guide plate 110 change its propagation path and then be emitted from a specific surface area (such as the lower surface) of the transparent light guide plate 110. Figure 3Only part of the light path propagation is demonstrated in the figure. In actual application, there are more similar or different light propagation paths, which are not limited here. It can be seen that the utility model can control the position distribution of the optical structure on the transparent light guide plate 110, thereby controlling the emission of light from a specific surface area on the transparent light guide plate surface, so that the transparent light guide plate 110 can convert the light emitted by the surrounding line light source 120 into a surface light source. Using the surface light source to illuminate the product 140 on the assembly line 130 can achieve the effect of uniformly illuminating the product 140, and can avoid the situation where the brightness of the product center light is lower than the brightness of the surrounding light as in the prior art, which is conducive to the camera 200 to capture the product 140 more accurately.
[0030] Specifically, the optical structure of the transparent light guide plate 110 of the novel light guide plate structure of this embodiment includes: a first optical structure 111 located on the upper surface of the transparent light guide plate 110, such as Figure 3 The first optical structure 111 can make part of the light entering the transparent light guide plate 110 change its propagation path and then emit from the specified area on the lower surface of the transparent light guide plate 110, so as to evenly distribute part of the light in the transparent light guide plate 110 to the lower surface area of the transparent light guide plate 110, for example Figure 3 Furthermore, when there are a sufficient number of first optical structures 111 distributed in a certain regular pattern on the upper surface of the transparent light guide plate 110, most of the light in the transparent light guide plate 110 can be evenly distributed to various areas on the lower surface of the transparent light guide plate 110, so that the lower surface of the transparent light guide plate 110 becomes a surface light source to irradiate illumination light.
[0031] Specifically, the optical structure of the transparent light guide plate 110 of the novel light guide plate structure of this embodiment further includes: a second optical structure 112 located on the lower surface of the transparent light guide plate 110, such as Figure 3 As shown; the second optical structure 112 can make part of the light entering the transparent light guide plate 110 change its propagation path and then be emitted to the specified area on the upper surface of the transparent light guide plate 110, so as to realize that part of the light in the transparent light guide plate 110 is emitted from the specified area on the upper surface of the transparent light guide plate 110, for example Figure 3 The outgoing light 11 shown in the figure provides a certain degree of illumination brightness above the transparent light guide plate 110; or, partially changes the optical path of part of the light in the transparent light guide plate 110 from the transparent light guide plate 110 to the first light structure 111, and then the first optical structure 111 changes the optical path propagation path of part of the light and emits it from a specified area on the lower surface of the transparent light guide plate 110, for example Figure 3 The outgoing light 222 shown in FIG. 1 provides more illumination brightness for the bottom of the transparent light guide plate 110 .
[0032] Specifically, the first optical structure 111 and the second optical structure 112 of the transparent light guide plate 110 of the novel light guide plate structure of the present embodiment may be recessed dots formed by a hot pressing process; in practical applications, they may also be convex dots, as long as the light propagation path can be changed in a controllable manner, which is not limited here. Preferably, the cross-sectional shape of the first optical structure 111 and the second optical structure 112 may be an arc such as a semicircle or a circle, or a regular polygon such as a triangle, a trapezoid, or a rectangle, or other irregular custom graphics, which are not further limited here. Preferably, in order to reduce the influence of the optical structure provided on the transparent light guide plate 110 on the imaging of the camera 200 through the transparent light guide plate 110 to the product 140 on the assembly line 130, the size of the optical structure is as small as possible, for example, the maximum size of the optical structure is limited to a circle with a diameter of 28 microns to 30 microns.
[0033] Furthermore, the first optical structure 111 and the second optical structure 112 of the transparent light guide plate 110 of the novel light guide plate structure of this embodiment are alternately distributed up and down, so that the surface of the transparent light guide plate 110 has both an area reserved for light emission and an optical structure set up to change the light propagation path.
[0034] Furthermore, the number of the first optical structures 111 and the number of the second optical structures 112 of the transparent light guide plate 110 of the novel light guide plate structure of this embodiment increases from the periphery of the transparent light guide plate 110 (i.e., the side close to the linear light source 120) to the center, so as to change the paths of more light propagating in the transparent light guide plate 110 in the area where the light illumination intensity becomes weaker, so that the light emitted toward the lower surface of the transparent light guide plate 110 is more uniform. Preferably, the number of the first optical structures 111 is greater than the number of the second optical structures 112, that is, more light in the transparent light guide plate 110 can be emitted from the lower surface of the transparent light guide plate 110 after the propagation paths are changed, so that the illumination intensity of the lower surface of the transparent light guide plate 110 is greater than that of the upper surface.
[0035] Specifically, the transparent light guide plate 110 of the novel light guide plate structure of this embodiment may be made of organic glass (Polymethylmethacrylate, PMMA); and the line light source 120 is an LED light source.
[0036] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modification, equivalent substitution or improvement made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.
Claims
1. A novel light guide plate structure, characterized in that: include: Transparent light guide plate, linear light source; The surface of the transparent light guide plate is provided with an optical structure for changing the light path; The line light source is arranged on the side of the transparent light guide plate, so that the light emitted by the line light source is incident into the transparent light guide plate from the side of the transparent light guide plate; The optical structure comprises: a first optical structure located on the upper surface of the transparent light guide plate; The first optical structure can make part of the light incident on the transparent light guide plate change its propagation path and then be emitted from a designated area on the lower surface of the transparent light guide plate.
2. The novel light guide plate structure according to claim 1, characterized in that: The optical structure further comprises: a second optical structure located on the lower surface of the transparent light guide plate; The second optical structure can make part of the light incident on the transparent light guide plate change its propagation path and then be incident on a designated area on the upper surface of the transparent light guide plate.
3. The novel light guide plate structure according to claim 2, characterized in that: The first optical structure and the second optical structure are both recessed dots formed by a hot pressing process.
4. The novel light guide plate structure according to claim 2, characterized in that: The first optical structure and the second optical structure are alternately distributed up and down.
5. The novel light guide plate structure according to claim 2, characterized in that: The number of the first optical structures and the number of the second optical structures increase from the periphery to the center of the transparent light guide plate.
6. The novel light guide plate structure according to claim 2, characterized in that: The number of the first optical structures is greater than the number of the second optical structures.
7. The novel light guide plate structure according to claim 1, characterized in that: The transparent light guide plate is made of organic glass.
8. The novel light guide plate structure according to claim 1, characterized in that: The line light source is an LED light source.