Modular combined shadowless light source

Abstract

This application relates to a modularly assembled planar shadowless light source, belonging to the field of lighting equipment technology, aiming to address the problems of large size and inconvenient installation of traditional shadowless light sources. A modularly assembled planar shadowless light source includes a frame and a light guide plate disposed inside the frame. A light-emitting plate is disposed inside the frame for emitting light towards the light guide plate. A fixing component is provided on the frame for fixing the light-emitting plate and the light guide plate to the frame. This application improves the ease of installation of the shadowless light source.

Description

Technical Field

[0001] This application relates to the field of lighting equipment technology, and in particular to a modularly combined planar shadowless light source. Background Technology

[0002] In machine vision inspection, coaxial light sources are mainly used to inspect workpieces with highly reflective surfaces such as glass or metal, and are used to detect dents, scratches, cracks and foreign objects on the smooth surface of objects.

[0003] In actual industrial installations, the limited space for testing equipment or the distance between testing stations often prevents the installation of such large light sources, or their installation may interfere with the movement of other mechanisms, severely restricting the flexibility of their application scenarios.

[0004] Therefore, there is an urgent need for a compact and easily expandable planar shadowless light source. Summary of the Invention

[0005] To improve the ease of installation of shadowless light sources, this application provides a modularly assembled planar shadowless light source.

[0006] The modularly combined planar shadowless light source provided in this application adopts the following technical solution: A modular planar shadowless light source includes a frame and a light guide plate disposed inside the frame. A light-emitting plate is disposed inside the frame for emitting light toward the light guide plate. A fixing component is disposed on the frame for fixing the light-emitting plate and the light guide plate to the frame.

[0007] By adopting the above technical solution, this application designs the planar shadowless light source as a modular structure. Each light source module consists of a frame, a light guide plate, a light-emitting plate, and a fixing component, forming an independent optical unit. The light-emitting plate emits light towards the side of the light guide plate. The light enters the interior of the light guide plate from the side, diffuses uniformly within the light guide plate, and then exits from the front of the light guide plate, forming uniform planar illumination. The fixing component securely mounts the light-emitting plate and the light guide plate to the frame, ensuring the structural integrity and optical stability of the light source module. This modular design makes each light source module compact and small in size, allowing for flexible installation in space-constrained inspection stations. It solves the problem that traditional large coaxial light sources are too large to install or interfere with the movement of other mechanisms, significantly improving the ease of installation and application flexibility of the shadowless light source.

[0008] Preferably, the fixing component includes a cover frame and fixing screws; the frame has an internal mounting ring groove for the light guide plate to abut against, and the cover frame covers the side wall of the light guide plate away from the frame to prevent the light guide plate from disengaging from the mounting ring groove; the fixing screws pass through the cover frame for threaded connection to the frame.

[0009] By adopting the above technical solution, during assembly, the light guide plate is first placed into the mounting ring groove of the frame, and then the cover frame is placed over the side of the light guide plate away from the frame, with the edge of the cover frame pressing against the edge area of ​​the light guide plate. Finally, the cover frame is locked and fixed to the frame using fixing screws. The cover frame and the mounting ring groove cooperate to form a clamping and fixing structure for the light guide plate. The installation process is simple and quick, requiring no adhesives or complex snap-fit ​​structures, facilitating later maintenance and component replacement.

[0010] Preferably, the light-emitting plate includes several sets of circuit boards and several sets of lamp beads. All the circuit boards are circumferentially distributed around the light guide plate, and all the lamp beads are spaced apart on the sidewall of each set of circuit boards facing the light guide plate for emitting light.

[0011] By adopting the above technical solution, circuit boards are distributed around the light guide plate, and LEDs are installed on the side of the circuit board facing the light guide plate. The light emitted by the LEDs enters the interior of the light guide plate from the side. This side-entry lighting method allows the light to undergo multiple reflections and diffusions inside the light guide plate before being uniformly emitted from the front of the light guide plate, forming highly uniform planar illumination. Multiple circuit boards are arranged circumferentially around the light guide plate, ensuring that light sources are incident on all sides of the light guide plate, further improving the uniformity of illumination.

[0012] Preferably, a heat-conducting sheet for auxiliary heat dissipation is attached between the circuit board and the frame.

[0013] By adopting the above technical solution, the heat generated by the LED during operation is conducted through the circuit board to the heat-conducting plate, which then transfers the heat to the frame for heat dissipation. The heat-conducting plate fills the assembly gap between the circuit board and the frame, increases the contact area, reduces thermal resistance, and enables the heat generated by the LED to be quickly conducted to the frame and dissipated outwards. This effectively controls the operating temperature rise of the light source module, extends the lifespan of the LED, and ensures the stability of light emission.

[0014] Preferably, a protective plate is provided on the side of the light-emitting plate away from the cover frame, and a reflective film is provided on the side wall of the light-emitting plate facing the protective plate, and the reflective film is provided with dot holes.

[0015] By adopting the above technical solution, a protective plate covers the side of the light guide plate away from the cover frame, i.e., the back of the light guide plate, thus protecting it. A reflective film is set on the side of the light guide plate facing the protective plate, and the reflective film has nanoscale dot holes. When light is transmitted inside the light guide plate, some light shines towards the back. The reflective film reflects this light back into the light guide plate, and the dot holes finely control the distribution of the reflected light, making the light more uniformly emitted from the front of the light guide plate. This avoids brightness loss caused by light leakage from the back of the light guide plate and improves the luminous efficiency and illuminance uniformity of the light source.

[0016] Preferably, a connecting component is provided between adjacent borders for connecting adjacent borders to each other.

[0017] By adopting the above technical solution, when the workpiece size is large and the illumination area of ​​a single light source module is insufficient, multiple light source modules can be spliced ​​together along the plane using connecting components. The connecting components ensure seamless splicing between adjacent light source modules, flexibly expanding the illumination area without altering the optical characteristics of individual modules, thus meeting the inspection needs of workpieces of different sizes.

[0018] Preferably, the connecting assembly includes a connecting plate and a connector; the connecting plate is disposed at intervals along the circumference of the frame on the side wall of the frame, and the connector passes through the connecting plate of the adjacent frame to fasten the connecting plate of the adjacent frame.

[0019] By adopting the above technical solution, the connecting plates on two adjacent frames are aligned during splicing, and then the connectors are passed through the mounting holes on the two connecting plates and locked in place, thus completing the splicing of the light source modules. This connection method is simple in structure, convenient to operate, provides a firm and reliable connection, and is easy to disassemble, allowing for easy adjustment of the number of modules as needed.

[0020] Preferably, a heat-conducting plate is provided inside the frame along the circumference of the frame, and a cooling channel for the flow of cooling medium is left between the heat-conducting plate and the inner peripheral wall of the frame; the heat-conducting plate is used to disperse the heat of the light-emitting plate, and each set of heat-conducting plates has several sets of heat dissipation fins on its sidewall.

[0021] By adopting the above technical solution, a liquid cooling structure is integrated inside the frame. A heat-conducting plate is attached to the mounting area of ​​the light-emitting panel. The heat generated by the light-emitting panel is first conducted to the heat-conducting plate, and then transferred to the cooling medium flowing in the cooling channel. The heat dissipation fins increase the contact area between the heat-conducting plate and the cooling medium, significantly improving the convective heat transfer efficiency. The cooling medium flows in the cooling channel, continuously carrying away heat, achieving active liquid cooling of the light source module. This liquid cooling structure integrated inside the frame significantly improves heat dissipation capacity while maintaining a compact size for the light source module, ensuring the temperature stability of the light source under high-power, long-term operation.

[0022] Preferably, the side wall of the frame is provided with a feed hole and a discharge hole for connecting the inside of the cooling channel. A feed pipe for inputting cooling medium is inserted into the feed hole, and a discharge pipe for discharging cooling medium is inserted into the discharge hole.

[0023] By adopting the above technical solution, the cooling medium enters the cooling channel inside the frame through the feed pipe, absorbs heat through the heat-conducting plate and heat dissipation fins, and is then discharged from the discharge pipe into the external liquid cooling system for cooling and recycling. The feed pipe and discharge pipe are installed by plugging, which facilitates connection and disassembly with the external liquid cooling pipeline.

[0024] Preferably, the feed holes and discharge holes of adjacent frames correspond to each other, and the inner diameter of the feed holes and discharge holes of adjacent frames is the same.

[0025] By adopting the above technical solution, when multiple light source modules are spliced ​​together, the inlet and outlet holes on adjacent frames are aligned and have the same diameter. This allows for the direct connection of cooling channels between adjacent modules in series or parallel using pipes, enabling multiple light source modules to share a single external liquid cooling system. This standardized liquid cooling interface design further enhances the convenience of modular assembly and the flexibility of system integration.

[0026] In summary, this application includes at least one of the following beneficial technical effects: 1. By designing the planar shadowless light source as a modular structure, each light source module is compact and small in size, and can be flexibly installed in the space-constrained inspection station. This solves the problem that traditional large coaxial light sources are too large to be installed or interfere with the movement of other mechanisms, and significantly improves the ease of installation and the flexibility of application scenarios of the shadowless light source.

[0027] 2. By setting up connecting components, multiple light source modules can be seamlessly spliced ​​in a plane, which can flexibly expand the lighting area without changing the optical characteristics of individual modules. There is no need to customize light sources for workpieces of different sizes, which reduces equipment costs and improves the versatility of light source configuration.

[0028] 3. By integrating cooling channels, heat conduction plates, and heat dissipation fins inside the frame, an active liquid cooling system is constructed. While maintaining the compact size of the module, the heat dissipation efficiency is greatly improved, ensuring the temperature stability and luminous stability of the light source under high power and long-term operation, and extending the service life of the LED chips.

[0029] 4. By designing the feed holes and discharge holes of adjacent frames to correspond to each other and have the same diameter, the cooling channels of multiple splicing modules can be easily connected in series or in parallel to share an external liquid cooling system, further improving the system integration and ease of use of the modular combination. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of a modularly combined planar shadowless light source according to an embodiment of this application.

[0031] Figure 2 It is an exploded view used to illustrate the internal structure of the border.

[0032] Figure 3 It is a cross-sectional schematic diagram used to show the internal structure of the frame.

[0033] Figure 4 This is a cross-sectional schematic diagram used to illustrate the cooling channels inside the frame.

[0034] Explanation of reference numerals in the attached figures: 1. Frame; 11. Light guide plate; 12. Mounting ring groove; 13. Cooling channel; 14. Feed hole; 141. Feed pipe; 15. Discharge hole; 151. Discharge pipe; 2. Light-emitting plate; 21. Circuit board; 211. Heat-conducting sheet; 22. Lamp bead; 3. Fixing assembly; 31. Cover frame; 32. Fixing screw; 4. Protective plate; 41. Reflective film; 5. Connecting assembly; 51. Connecting plate; 52. Connector; 6. Heat-conducting plate; 61. Heat dissipation fins. Detailed Implementation

[0035] The following is in conjunction with the appendix Figure 1-4 This application will be described in further detail.

[0036] This application discloses a modular planar shadowless light source to improve the ease of installation of shadowless light sources.

[0037] Reference Figure 1 and Figure 2 A modular planar shadowless light source includes a frame 1, which is a rectangular metal frame made of aluminum alloy, possessing good thermal conductivity and structural strength. An mounting groove 12 is formed inside the frame 1, arranged circumferentially along the inner wall of the frame 1. A light guide plate 11 is installed within the cavity of the mounting groove 12. The light guide plate 11 is made of high-transmittance optical-grade acrylic or polycarbonate sheet, used to uniformly diffuse side-incident light and emit it from the front.

[0038] Reference Figure 2 and Figure 3 A light-emitting panel 2 is installed inside the frame 1, emitting light towards the side of the light guide plate 11. The light-emitting panel 2 includes multiple sets of circuit boards 21 and multiple sets of LED beads 22 spaced along the length of each set of circuit boards 21. Preferably, there are four sets of circuit boards 21, respectively disposed on the inner wall of the frame 1 corresponding to the four sides of the light guide plate 11. Each set of LED beads 22 faces the side of the light guide plate 11, so that light enters the interior of the light guide plate 11 from the four sides of the light guide plate 11, and after multiple reflections and diffusions inside the light guide plate 11, it is uniformly emitted from the front of the light guide plate 11, forming uniform planar illumination.

[0039] Reference Figure 2 and Figure 3A heat-conducting sheet 211 is attached between the circuit board 21 and the inner wall of the frame 1. The heat-conducting sheet 211 is a heat-conducting silicone sheet or a graphite sheet, which is used to fill the assembly gap between the circuit board 21 and the frame 1 and quickly conduct the heat generated by the lamp bead 22 to the frame 1 for heat dissipation.

[0040] Reference Figure 2 and Figure 3 A fixing component 3 is installed on the frame 1 to fix the light-emitting plate 2 and the light guide plate 11 to the frame 1. The fixing component 3 includes a cover frame 31 and fixing screws 32. During assembly, the light guide plate 11 is embedded in the mounting ring groove 12, and the cover frame 31 covers the side wall of the light guide plate 11 away from the frame 1, with the edge of the cover frame 31 pressing against the four edges of the light guide plate 11. The fixing screws 32 pass through the screw holes opened on the cover frame 31 and are screwed into the corresponding threaded holes on the frame 1, locking the cover frame 31 to the frame 1, thereby clamping and fixing the light-emitting plate 2 and the light guide plate 11 to the frame 1.

[0041] Reference Figure 2 and Figure 3 A protective plate 4 is provided on the side of the light guide plate 11 facing away from the cover frame 31 (i.e., the back of the light guide plate 11). The protective plate 4 is located at the bottom of the mounting ring groove 12 of the frame 1 and covers the back of the light guide plate 11. A reflective film 41 is provided on the side of the light guide plate 11 facing the protective plate 4. The reflective film 41 is provided with nanoscale dot holes. The protective plate 4 is used to protect the reflective film 41 and the back of the light guide plate 11 from external damage. The reflective film 41 and the dot holes are used to reflect the light directed to the back of the light guide plate 11 back into the light guide plate 11, so that the light is emitted more evenly from the front of the light guide plate 11, improving the light efficiency and illumination uniformity.

[0042] Reference Figure 1 and Figure 2 A connecting component 5 is provided between adjacent frame 1 for splicing and combining multiple light source modules along the planar direction. The connecting component 5 includes a connecting plate 51 and a connector 52. Multiple connecting plates 51 are arranged circumferentially on the outer side wall of each frame 1, and mounting through holes are provided on the connecting plates 51. During splicing, the connecting plates 51 on two adjacent frame 1 are aligned, and the connectors 52 (such as bolts and nuts) are passed through the mounting through holes on the two adjacent connecting plates 51 and locked, thereby fastening the adjacent light source modules together and achieving seamless splicing along the planar direction. When the size of the workpiece being inspected is large, the illumination area can be flexibly expanded by splicing multiple light source modules.

[0043] Reference Figure 3 and Figure 4A heat-conducting plate 6 is arranged along the circumference of the frame 1 inside the frame 1, and the heat-conducting plate 6 is attached to the mounting area of ​​the light-emitting plate 2 and the protective plate 4. A cooling channel 13 is left between the heat-conducting plate 6 and the inner peripheral wall of the frame 1, and the cooling channel 13 extends along the circumference of the frame 1 to allow the flow of cooling medium. Several sets of heat dissipation fins 61 are arranged at intervals on the side wall of the heat-conducting plate 6, and the heat dissipation fins 61 extend into the cooling channel 13 to increase the contact area between the heat-conducting plate 6 and the cooling medium. The heat generated by the lamp bead 22 when it is working is conducted to the frame 1 and the heat-conducting plate 6 through the circuit board 21 and the heat-conducting plate 211. When the cooling medium flows in the cooling channel 13, it conducts efficient heat exchange with the heat-conducting plate 6 through the heat dissipation fins 61 to remove the heat, thereby realizing active liquid cooling of the light source module.

[0044] Reference Figure 3 and Figure 4 The side wall of the frame 1 has a through-hole 14 and a discharge hole 15, both of which are connected to the interior of the cooling channel 13. A feed pipe 141 is inserted inside the feed hole 14 for feeding low-temperature cooling medium into the cooling channel 13; a discharge pipe 151 is inserted inside the discharge hole 15 for discharging the heat-absorbing cooling medium to an external liquid cooling system for cooling circulation.

[0045] Reference Figure 3 and Figure 4 When multiple light source modules are used together, the inlet holes 14 and outlet holes 15 of adjacent frame 1 are positioned correspondingly and have the same inner diameter. The cooling channels 13 of adjacent modules can be connected in series through pipe joints, so that the cooling medium flows through the cooling channels 13 of each module in sequence for heat dissipation; alternatively, the cooling channels 13 of each module can be connected in parallel through manifolds to achieve independent liquid supply and heat dissipation for each module.

[0046] The implementation principle of a modularly combined planar shadowless light source in this application embodiment is as follows: In use, depending on the size requirements of the workpiece being inspected, a single light source module can be used independently, or multiple light source modules can be spliced ​​together along the plane using connecting plate 51 and connector 52 to form a large-area light source. During installation, the light source module is fixed at the inspection station below the camera, with the light-emitting surface of the light guide plate 11 facing the workpiece to be inspected.

[0047] During operation, the LED beads 22 are powered on and emit light. The light enters the interior of the light guide plate 11 from its four sides and undergoes multiple reflections and diffusions within the light guide plate 11. Some of the light rays that are directed to the back are reflected back into the light guide plate 11 by the reflective film 41 and the dot holes. Finally, the light rays are uniformly emitted from the front of the light guide plate 11, providing coaxial illumination of the workpiece below the camera and creating a shadowless lighting effect.

[0048] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A modularly assembled planar shadowless light source, characterized in that: Includes a frame (1) and a light guide plate (11) disposed inside the frame (1). A light-emitting plate (2) is disposed inside the frame (1) for emitting light toward the light guide plate (11). A fixing component (3) is disposed on the frame (1) for fixing the light-emitting plate (2) and the light guide plate (11) to the frame (1).

2. The modularly combined planar shadowless light source according to claim 1, characterized in that: The fixing component (3) includes a cover frame (31) and fixing screws (32); the frame (1) has an installation ring groove (12) for the light guide plate (11) to abut; the cover frame (31) covers the side wall of the light guide plate (11) away from the frame (1) to restrict the light guide plate (11) from disengaging from the installation ring groove (12); the fixing screws (32) pass through the cover frame (31) to thread the frame (1).

3. The modularly combined planar shadowless light source according to claim 1, characterized in that: The light-emitting plate (2) includes several sets of circuit boards (21) and several sets of lamp beads (22). All the circuit boards (21) are distributed circumferentially around the light guide plate (11), and all the lamp beads (22) are spaced apart on the side wall of each set of circuit boards (21) facing the light guide plate (11) for emitting light.

4. The modularly combined planar shadowless light source according to claim 3, characterized in that: A heat-conducting sheet (211) for auxiliary heat dissipation is attached between the circuit board (21) and the frame (1).

5. A modularly combined planar shadowless light source according to claim 1, characterized in that: A protective plate (4) is provided on the side of the light-emitting plate (2) away from the cover frame (31). A reflective film (41) is provided on the side wall of the light-emitting plate (2) facing the protective plate (4), and the reflective film (41) is provided with dot holes.

6. The modularly combined planar shadowless light source according to claim 1, characterized in that: A connecting component (5) is provided between adjacent borders (1) for connecting adjacent borders (1) to each other.

7. A modularly assembled planar shadowless light source according to claim 6, characterized in that: The connecting assembly (5) includes a connecting plate (51) and a connector (52); the connecting plate (51) is disposed at intervals along the circumference of the frame (1) on the side wall of the frame (1), and the connector (52) passes through the connecting plate (51) of the adjacent frame (1) to fasten the connecting plate (51) of the adjacent frame (1).

8. A modularly combined planar shadowless light source according to claim 1, characterized in that: A heat-conducting plate (6) is provided inside the frame (1) along the circumference of the frame (1), and a cooling channel (13) for the flow of cooling medium is left between the heat-conducting plate (6) and the inner peripheral wall of the frame (1); the heat-conducting plate (6) is used to disperse the heat of the light-emitting plate (2), and several sets of heat dissipation fins (61) are provided on the side wall of each set of heat-conducting plates (6).

9. A modularly assembled planar shadowless light source according to claim 8, characterized in that: The side wall of the frame (1) is provided with a feed hole (14) and a discharge hole (15) for connecting the inside of the cooling channel (13). A feed pipe (141) for inputting cooling medium is inserted inside the feed hole (14), and a discharge pipe (151) for discharging cooling medium is inserted inside the discharge hole (15).

10. A modularly assembled planar shadowless light source according to claim 9, characterized in that: The feed hole (14) and discharge hole (15) of the adjacent frame (1) correspond to each other, and the inner diameter of the feed hole (14) and discharge hole (15) of the adjacent frame (1) is the same.

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