Splicing non-dark-band surface light source

Abstract

This utility model discloses a spliced ​​surface light source without dark bands, comprising at least two surface light sources, namely a first surface light source and a second surface light source. The first surface light source includes a first light source housing, a first surface light source module installed inside the first light source housing, and a first splicable diffuser plate installed at one end of the first light source housing. The first splicable diffuser plate has a first locking tooth structure at at least one end. The second surface light source includes a second light source housing, a second surface light source module installed inside the second light source housing, and a second splicable diffuser plate installed at one end of the second light source housing. The second splicable diffuser plate has a second locking tooth structure at at least one end. The first locking tooth structure and the second locking tooth structure can be engaged or disengaged. When the first locking tooth structure and the second locking tooth structure are engaged, the first surface light source and the second surface light source are spliced ​​together. This utility model ensures that there are no dark bands at the splicing point of the first surface light source and the second surface light source, and ensures uniform brightness at the splicing point.

Description

Technical Field

[0001] This utility model relates to the technical field of surface light sources, and in particular to a spliced ​​surface light source without dark bands. Background Technology

[0002] In the visual inspection of large workpieces (such as LCD panels, PCB circuit boards, and metal sheets), large-size surface light sources are required to provide uniform illumination. The general usage of the surface light source is as follows: the surface light source is located at the bottom -> the large workpiece is located in the middle -> the camera is located above, with the surface light source illuminating the bottom of the large workpiece, and the camera taking pictures of the large workpiece. This is used for perspective imaging, highlighting contour imaging, or large-format uniform illumination of the large workpiece.

[0003] However, due to manufacturing limitations, the size of a single surface light source is typically no more than 600mm × 600mm. To cover larger workpieces with a larger area, surface light sources need to be spliced ​​and combined. Existing technology uses a mechanical frame splicing method to splice surface light sources, but this method has the following drawbacks:

[0004] 1. Mechanical frame occlusion issue: The supporting frames between splicing units can block light, forming dark bands with a width of 0.5–6mm, resulting in detection blind spots in the image segmentation area. Dark lines / bands severely interfere with image acquisition, causing detection blind spots or image artifacts (such as misjudgments as workpiece cracks or contamination), significantly reducing detection accuracy and reliability. Furthermore, post-processing software compensation is difficult and has limited effectiveness, and cannot completely eliminate uneven lighting at the hardware level.

[0005] 2. Mechanical frame obstruction further exacerbates the problem of uneven brightness: the edges of adjacent surface light sources are blocked by the mechanical frame, resulting in brightness attenuation. The illuminance difference at the splicing seam of the surface light sources can reach more than 20%, affecting grayscale consistency analysis. Utility Model Content

[0006] The purpose of this utility model is to overcome the above-mentioned defects in the prior art and provide a splicing surface light source without dark bands. By interlocking the first locking tooth structure at one end of the first splicable diffuser plate with the second locking tooth structure at one end of the second splicable diffuser plate, two adjacent first surface light sources and second surface light sources can be spliced ​​together, thereby achieving no dark bands at the splicing point of the two surface light sources and ensuring uniform brightness at the splicing point.

[0007] To achieve the above objectives, this utility model provides a spliced ​​surface light source without dark bands, comprising at least two surface light sources, namely a first surface light source and a second surface light source. The first surface light source includes a first light source housing, a first surface light source module installed inside the first light source housing, and a first splicable diffuser plate installed at one end of the first light source housing. The first splicable diffuser plate has a first locking tooth structure at at least one end. The second surface light source includes a second light source housing, a second surface light source module installed inside the second light source housing, and a second splicable diffuser plate installed at one end of the second light source housing. The second splicable diffuser plate has a second locking tooth structure at at least one end. The first locking tooth structure and the second locking tooth structure can be engaged or disengaged. When the first locking tooth structure and the second locking tooth structure are engaged, the first surface light source and the second surface light source are spliced ​​together.

[0008] Preferably, the first surface light source further includes a first power line disposed on one side wall or bottom of the first light source housing, and the first power line is electrically connected to the first surface light source module.

[0009] Preferably, the second surface light source further includes a second power line disposed on one side wall or bottom of the second light source housing, and the second power line is electrically connected to the second surface light source module.

[0010] Preferably, the first locking tooth structure includes a plurality of linearly arranged first trapezoidal teeth and a first tooth groove formed between two adjacent first trapezoidal teeth, and the second locking tooth structure includes a plurality of linearly arranged second trapezoidal teeth and a second tooth groove formed between two adjacent second trapezoidal teeth, wherein the first trapezoidal teeth are engaged or separated from the second tooth groove, and the second trapezoidal teeth are engaged or separated from the first tooth groove.

[0011] Preferably, the tooth height of the first trapezoidal tooth and the second trapezoidal tooth are both 1 mm, the tooth tip angle of the first trapezoidal tooth and the second trapezoidal tooth are both 90 degrees, and the width distance between the first tooth groove and the second tooth groove is both 2 mm.

[0012] Preferably, the tooth surfaces of the first and second trapezoidal teeth are coated with a SiO2 nanoparticle diffusion layer; the use of the SiO2 nanoparticle diffusion layer can further improve the brightness uniformity at the junction of the first and second light sources.

[0013] Preferably, the first light source housing includes a first base plate and a first transparent frame surrounding the periphery of the first base plate, and the second light source housing includes a second base plate and a second transparent frame surrounding the periphery of the second base plate. The purpose of using the first and second transparent frames is to enable the edges of the first and second light source modules to emit light at all angles, to provide certain light compensation for the brightness of their edges, and to further improve the brightness uniformity at the junction of the first and second light sources.

[0014] Preferably, the first splicable diffuser is attached to one end of the first transparent frame with UV adhesive, and the second splicable diffuser is attached to one end of the second transparent frame with UV adhesive. The UV adhesive not only provides sufficient adhesion but is also transparent, which can ensure the uniformity of brightness between the first splicable diffuser and the first transparent frame, and between the second splicable diffuser and the second transparent frame.

[0015] Preferably, the first transparent border and the second transparent border are PMMA material components.

[0016] Preferably, the first surface light source module includes a first PCB board installed inside the first light source housing, a plurality of first LED beads installed on the first PCB board in a matrix arrangement, and a plurality of second LED beads surrounding the first LED beads. The arrangement density of the second LED beads is greater than that of the first LED beads. The second surface light source module also includes a second PCB board installed inside the second light source housing, a plurality of third LED beads installed on the second PCB board in a matrix arrangement, and a plurality of fourth LED beads surrounding the third LED beads. The arrangement density of the fourth LED beads is greater than that of the first LED beads. The arrangement density of the three LED beads is greater than that of the first LED beads. This effectively improves the brightness of the edge of the first light source module, thereby compensating for the brightness of the edge of the first light source module and improving the light uniformity of the first light source module. Similarly, the arrangement density of the fourth LED bead is greater than that of the third LED bead. This effectively improves the brightness of the edge of the second light source module, thereby compensating for the brightness of the edge of the second light source module and improving the light uniformity of the second light source module. Ultimately, this further improves the brightness uniformity at the junction of the first and second light sources.

[0017] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0018] 1. The first splicable diffuser plate of the first light source of this utility model is formed into a first locking tooth structure connected to itself by subtractive manufacturing or plastic molding. The second splicable diffuser plate of the second light source is formed into a second locking tooth structure connected to itself by subtractive manufacturing or plastic molding. Therefore, the light transmittance of the first splicable diffuser plate and the first locking tooth structure is consistent, and the light transmittance of the second splicable diffuser plate and the second locking tooth structure is consistent. By interlocking the first locking tooth structure and the second locking tooth structure, the first light source and the second light source are spliced ​​together, and it can be ensured that there is no dark band at the splicing point of the first light source and the second light source, thus ensuring the brightness uniformity at the splicing point.

[0019] 2. In summary, the splicing surface light source without dark bands provided by this utility model can ensure that there are no dark bands at the splicing point of the first surface light source and the second surface light source, ensuring the brightness uniformity at the splicing point of the two, and the splicing stability of the two is good. In addition, the manufacturing cost of the first surface light source and the second surface light source is low, and the splicing expansion is convenient. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of a spliced ​​surface light source without dark bands provided by an embodiment of this utility model;

[0022] Figure 2 yes Figure 1 A magnified view of the area pointed to by the letter A;

[0023] Figure 3 This is an exploded structural diagram of the first light source provided in an embodiment of the present invention;

[0024] Figure 4 yes Figure 3 A magnified view of the area pointed to by the letter B;

[0025] Figure 5 This is an exploded structural diagram of the second light source provided in an embodiment of this utility model;

[0026] Figure 6 yes Figure 5 A magnified view of the area pointed to by the letter C.

[0027] The diagram includes:

[0028] 1. First light source; 11. First light source housing; 111. First base plate; 112. First transparent frame; 12. First PCB board; 13. First splicable diffuser board; 14. First locking tooth structure; 141. First trapezoidal tooth; 142. First tooth groove; 15. First power cord; 2. Second light source; 21. Second light source housing; 211. Second base plate; 212. Second transparent frame; 22. Second PCB board; 23. Second splicable diffuser board; 24. Second locking tooth structure; 241. Second trapezoidal tooth; 242. Second tooth groove; 25. Second power cord. Detailed Implementation

[0029] The technical solution of this embodiment of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiment is one embodiment of the present invention, and not all embodiments thereof. Based on this embodiment of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] Please see Figures 1 to 6 This utility model provides a splicing surface light source without dark bands, including at least two surface light sources, namely a first surface light source 1 and a second surface light source 2. The first surface light source 1 includes a first light source housing 11, a first surface light source 1 module installed inside the first light source housing 11, and a first splicable diffuser plate 13 installed at one end of the first light source housing 11. The first splicable diffuser plate 13 has a first locking tooth structure 14 at at least one end. The second surface light source 2 includes a second light source housing 21, a second surface light source 2 module installed inside the second light source housing 21, and a second splicable diffuser plate 23 installed at one end of the second light source housing 21. The second splicable diffuser plate 23 has a second locking tooth structure 24 at at least one end. The first locking tooth structure 14 and the second locking tooth structure 24 can be engaged or disengaged. When the first locking tooth structure 14 and the second locking tooth structure 24 are engaged, the first surface light source 1 and the second surface light source 2 are spliced ​​together.

[0031] The first light source 1 also includes a first power line 15 disposed on one side wall or bottom of the first light source housing 11, and the first power line 15 is electrically connected to the first light source 1 module.

[0032] The second light source 2 also includes a second power line 25 disposed on one side wall or bottom of the second light source housing 21, and the second power line 25 is electrically connected to the second light source 2 module.

[0033] The first locking tooth structure 14 includes a plurality of linearly arranged first trapezoidal teeth 141 and a first tooth groove 142 formed between two adjacent first trapezoidal teeth 141. The second locking tooth structure 24 includes a plurality of linearly arranged second trapezoidal teeth 241 and a second tooth groove 242 formed between two adjacent second trapezoidal teeth 241. The first trapezoidal teeth 141 and the second tooth groove 242 are engaged or separated, and the second trapezoidal teeth 241 and the first tooth groove 142 are engaged or separated.

[0034] The tooth height of the first trapezoidal tooth 141 and the second trapezoidal tooth 241 is 1mm, the tooth tip angle of the first trapezoidal tooth 141 and the second trapezoidal tooth 241 is 90 degrees, the width distance between the first tooth groove 142 and the second tooth groove 242 is 2mm, and when the first locking tooth structure 14 and the second locking tooth structure 24 are engaged, the distance gap between the first trapezoidal tooth 141 and the second trapezoidal tooth 241 is controlled within ±0.05mm. The above structure setting is not only sufficient to ensure the splicing strength of the first surface light source 1 and the second surface light source 2, but also facilitates the engagement or separation of the first locking tooth structure 14 and the second locking tooth structure 24, while ensuring that no dark band is generated at the splicing point of the first surface light source 1 and the second surface light source 2.

[0035] The surfaces of the first trapezoidal tooth 141 and the second trapezoidal tooth 241 are coated with a SiO2 nanoparticle diffusion layer. The particle size of the SiO2 nanoparticles is controlled between 50-100 nm. The advantage of spraying the SiO2 nanoparticle diffusion layer is that it makes the light at the junction of the first light source 1 and the second light source 2 more uniform, further improving the brightness uniformity at the junction.

[0036] The first light source housing 11 includes a first base plate 111 and a first transparent frame 112 surrounding the first base plate 111. The second light source housing 21 includes a second base plate 211 and a second transparent frame 212 surrounding the second base plate 211. The first transparent frame 112 allows the edge of the first light source 1 module to emit light at all angles, thereby providing some light compensation for the brightness of the edge of the first light source 1 module and improving the light uniformity of the first light source 1 module. Similarly, the second transparent frame 212 allows the edge of the second light source 2 module to emit light at all angles, thereby providing some light compensation for the brightness of the edge of the second light source 2 module and improving the light uniformity of the second light source 2 module. Ultimately, this further improves the brightness uniformity at the junction of the first light source 1 and the second light source 2.

[0037] The first splicable diffuser panel 13 is attached to one end of the first transparent frame 112 with UV adhesive, and the second splicable diffuser panel 23 is attached to one end of the second transparent frame 212 with UV adhesive. After the UV adhesive cures, it not only has a strong adhesion but also exhibits high transparency. Therefore, attaching the first splicable diffuser panel 13 to one end of the first transparent frame 112 with UV adhesive ensures the brightness uniformity between the first splicable diffuser panel 13 and the first transparent frame 112. Similarly, attaching the second splicable diffuser panel 23 to one end of the second transparent frame 212 with UV adhesive ensures the brightness uniformity between the second splicable diffuser panel 23 and the second transparent frame 212. Ultimately, this further improves the brightness uniformity at the splicing point between the first light source 1 and the second light source 2.

[0038] The first transparent border 112 and the second transparent border 212 are PMMA material components.

[0039] The first light source module 1 includes a first PCB board 12 installed inside the first light source housing 11, a plurality of first LED beads (not shown in the figure) installed on the first PCB board 12 and arranged in a matrix, and a plurality of second LED beads (not shown in the figure) surrounding the first LED beads. The arrangement density of the second LED beads is greater than that of the first LED beads. The second light source module 2 includes a second PCB board 22 installed inside the second light source housing 21, a plurality of third LED beads (not shown in the figure) installed on the second PCB board 22 and arranged in a matrix, and a plurality of fourth LED beads (not shown in the figure) surrounding the third LED beads. The arrangement density of the fourth LED beads is greater than that of the third LED beads. The arrangement density of the second LED is greater than that of the first LED, which effectively improves the brightness of the edge of the first light source module 1, thereby compensating for the brightness of the edge of the first light source module 1 and improving the light uniformity of the first light source module 1. Similarly, the arrangement density of the fourth LED is greater than that of the third LED, which effectively improves the brightness of the edge of the second light source module 2, thereby compensating for the brightness of the edge of the second light source module 2 and improving the light uniformity of the second light source module 2. Ultimately, this further improves the brightness uniformity at the junction of the first light source 1 and the second light source 2.

[0040] An embodiment of this utility model provides a spliced ​​surface light source without dark bands, the advantages of which are:

[0041] 1. By interlocking the first locking tooth structure 14 and the second locking tooth structure 24, the first light source 1 and the second light source 2 are spliced ​​together, and it can be ensured that there is no dark band at the splicing point of the first light source 1 and the second light source 2, thus avoiding uneven brightness at the splicing point.

[0042] 2. By spraying a SiO2 nanoparticle diffusion layer onto the first trapezoidal tooth 141 of the first locking tooth structure 14 and a SiO2 nanoparticle diffusion layer onto the second trapezoidal tooth 241 of the second locking tooth structure 24, the brightness uniformity at the splicing point of the first surface light source 1 and the second surface light source 2 is further improved.

[0043] 3. By setting a first transparent border 112 and a second transparent border 212, the brightness uniformity at the splicing point of the first light source 1 and the second light source 2 is further improved.

[0044] 4. By using UV adhesive, the first splicable diffuser plate 13 is attached to one end of the first transparent frame 112 and the second splicable diffuser plate 23 is attached to one end of the second transparent frame 212, thereby further improving the brightness uniformity at the splicing point of the first light source 1 and the second light source 2.

[0045] 5. By increasing the arrangement density of the second LED beads to be greater than that of the first LED beads, and increasing the arrangement density of the fourth LED beads to be greater than that of the third LED beads, the brightness uniformity at the junction of the first light source 1 and the second light source 2 is further improved.

[0046] 6. The splicing stability between the first light source 1 and the second light source 2 is good, the manufacturing cost is low, and the splicing expansion is convenient.

[0047] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A spliced ​​surface light source without dark bands, characterized in that, It includes at least two surface light sources, namely a first surface light source (1) and a second surface light source (2). The first surface light source (1) includes a first light source housing (11), a first surface light source (1) module installed inside the first light source housing (11), and a first splicable diffuser plate (13) installed at one end of the first light source housing (11). The first splicable diffuser plate (13) has a first locking tooth structure (14) at least at one end. The second surface light source (2) includes a second light source housing (21), a first surface light source (1) module installed inside the first light source housing (11), and a first splicable diffuser plate (13) installed at one end of the first light source housing (11). A second surface light source (2) module is provided inside the second light source housing (21) and a second splicable diffuser plate (23) is installed at one end of the second light source housing (21). The second splicable diffuser plate (23) has a second locking tooth structure (24) at at least one end. The first locking tooth structure (14) and the second locking tooth structure (24) are engaged or separated. When the first locking tooth structure (14) and the second locking tooth structure (24) are engaged, the first surface light source (1) and the second surface light source (2) are spliced ​​together.

2. A spliced ​​surface light source without dark bands according to claim 1, characterized in that, The first surface light source (1) also includes a first power line (15) disposed on one side wall or bottom of the first light source housing (11), and the first power line (15) is electrically connected to the first surface light source (1) module.

3. A spliced ​​surface light source without dark bands according to claim 1, characterized in that, The second surface light source (2) also includes a second power line (25) disposed on one side wall or bottom of the second light source housing (21), and the second power line (25) is electrically connected to the second surface light source (2) module.

4. A spliced ​​surface light source without dark bands according to claim 1, characterized in that, The first locking tooth structure (14) includes a plurality of linearly arranged first trapezoidal teeth (141) and a first tooth groove (142) formed between two adjacent first trapezoidal teeth (141). The second locking tooth structure (24) includes a plurality of linearly arranged second trapezoidal teeth (241) and a second tooth groove (242) formed between two adjacent second trapezoidal teeth (241). The first trapezoidal teeth (141) and the second tooth groove (242) are engaged or separated. The second trapezoidal teeth (241) and the first tooth groove (142) are engaged or separated.

5. A spliced ​​surface light source without dark bands according to claim 4, characterized in that, The tooth height of the first trapezoidal tooth (141) and the second trapezoidal tooth (241) is 1 mm, the tooth tip angle of the first trapezoidal tooth (141) and the second trapezoidal tooth (241) is 90 degrees, and the width distance between the first tooth groove (142) and the second tooth groove (242) is 2 mm.

6. A spliced ​​surface light source without dark bands according to claim 4, characterized in that, The tooth surfaces of the first trapezoidal tooth (141) and the second trapezoidal tooth (241) are coated with a SiO2 nanoparticle diffusion layer.

7. A spliced ​​surface light source without dark bands according to claim 1, characterized in that, The first light source housing (11) includes a first base plate (111) and a first transparent frame (112) surrounding the periphery of the first base plate (111). The second light source housing (21) includes a second base plate (211) and a second transparent frame (212) surrounding the periphery of the second base plate (211).

8. A spliced ​​surface light source without dark bands according to claim 7, characterized in that, The first splicable diffused panel (13) is attached to one end of the first transparent frame (112) with UV adhesive, and the second splicable diffused panel (23) is attached to one end of the second transparent frame (212) with UV adhesive.

9. A spliced ​​surface light source without dark bands according to claim 7, characterized in that, The first transparent border (112) and the second transparent border (212) are PMMA material components.

10. A spliced ​​surface light source without dark bands according to claim 1, characterized in that, The first surface light source (1) module includes a first PCB board (12) installed inside the first light source housing (11), a plurality of first LED beads installed on the first PCB board (12) and arranged in a matrix, and a plurality of second LED beads surrounding the first LED beads. The arrangement density of the second LED beads is greater than that of the first LED beads. The second surface light source (2) module includes a second PCB board (22) installed inside the second light source housing (21), a plurality of third LED beads installed on the second PCB board (22) and arranged in a matrix, and a plurality of fourth LED beads surrounding the third LED beads. The arrangement density of the fourth LED beads is greater than that of the third LED beads.

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