Uniform-irradiation lighting device and visual inspection system

Abstract

The embodiment of the utility model discloses a lighting device with uniform irradiation and a visual inspection system, which are used for solving the technical problem of poor uniformity of luminous intensity of the existing lighting device. The embodiment of the utility model comprises a condensation module and a light source module, wherein the condensation module is located on one side of a light emitting face of the light source module, the condensation module and the light source module are arranged in parallel, the light source module is used for emitting light rays at different angles to the condensation module, and the condensation module is used for refracting and converging the light rays at different angles. In the embodiment of the invention, the light source module can emit light rays with different angles to the light condensing module, the light rays are refracted and converged by the light condensing module to form relatively balanced light, the illumination intensity of each part in the effective irradiation range of the lighting device is uniform, the uniformity of the luminous intensity of the lighting device is greatly improved, and the imaging effect of the visual inspection system is effectively enhanced.

Description

Technical Field

[0001] The utility model relates to the technical field of vision detection, in particular to a lighting device with uniform illumination and a vision detection system. Background Art

[0002] The detection of existing workpieces is generally completed by a vision detection system. The vision detection system specifically includes a detection camera, a lens connected to the detection camera, and a lighting device. Among them, the lighting device is used to emit illumination light onto the surface to be measured of the workpiece, and the detection camera is used to obtain the light reflected from the surface to be measured to form an image.

[0003] Currently, the commonly used lighting device generally includes a PCB board and lamp beads, and the lamp beads are distributed on the PCB board. In actual work, within its effective illumination range, the above lighting device often has the technical problem of poor uniformity of luminous intensity. For example, Figure 8 As shown, it is specifically manifested that the luminous intensity in the middle of the effective illumination range is high, and the intensity at both edges of the effective illumination range is low. This situation will cause the light distribution on the surface to be measured of the workpiece to be uneven, directly affecting the imaging effect of the vision detection system.

[0004] Therefore, finding a technical solution to solve the above technical problems has become an important research topic for those skilled in the art. Summary of the Utility Model

[0005] The embodiments of the utility model disclose a lighting device with uniform illumination and a vision detection system, which are used to solve the technical problem of poor uniformity of luminous intensity of the existing lighting device.

[0006] A lighting device with uniform illumination provided by the utility model includes a light condensing module and a light source module;

[0007] Among them, the light condensing module is located on one side of the light-emitting surface of the light source module, and the light condensing module is arranged in parallel with the light source module. The light source module is used to emit light at different angles onto the light condensing module, and the light condensing module is used to refract and converge the light at different angles.

[0008] Optionally, the light source module includes a PCB board and a plurality of lamp beads;

[0009] The PCB board is divided into area A, area B, area C, and area D along the direction from the end of the PCB board to the middle of the PCB board. Among them, a plurality of the lamp beads are respectively arranged in area A, area B, area C, and area D, and the illumination angles of the lamp beads in area A, the illumination angles of the lamp beads in area B, the illumination angles of the lamp beads in area C, and the illumination angles in area D are all different.

[0010] Optionally, the irradiation angle range of the lamp beads in the A area is from 20° to 30°.

[0011] Optionally, the irradiation angle range of the lamp beads in the B area is from 50° to 60°.

[0012] Optionally, the irradiation angle range of the lamp beads in the C area is from 70° to 80°.

[0013] Optionally, the irradiation angle range of the lamp beads in the D area is from 110° to 120°.

[0014] Optionally, the light condensing module is a light condensing rod.

[0015] Optionally, the light condensing rod is a cylindrical structure extending along the length direction of the light emitting surface of the light source module.

[0016] Optionally, the light source module further includes a heat dissipation bottom plate;

[0017] The heat dissipation bottom plate is arranged on the side surface of the PCB board far away from the lamp beads.

[0018] A vision detection system provided by the present utility model includes a detection camera, a lens connected to the detection camera, and the above-mentioned light-emitting device with uniform irradiation.

[0019] Compared with the prior art, the present utility model has the following beneficial effects:

[0020] In the light-emitting device of this embodiment, the light source module can emit light rays at different angles onto the light condensing module, and after being refracted and converged by the light condensing module, relatively uniform light is formed. The light intensity is uniform everywhere within the effective irradiation range of the light-emitting device, greatly improving the uniformity of the light-emitting intensity of the light-emitting device and effectively enhancing the imaging effect of the vision detection system. Description of the Drawings

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0022] Figure 1 It is a schematic structural diagram of a light-emitting device with uniform irradiation provided by an embodiment of the present utility model;

[0023] Figure 2 It is a schematic diagram of the irradiation angles of the lamp beads in each of the A, B, C, and D areas in a light-emitting device with uniform irradiation provided by an embodiment of the present utility model;

[0024] Figure 3 Schematic diagram of the change in the irradiation angle of the lamp beads in area A of a light-emitting device with uniform irradiation provided by an embodiment of the present utility model;

[0025] Figure 4 Schematic diagram of the change in the irradiation angle of the lamp beads in area B of a light-emitting device with uniform irradiation provided by an embodiment of the present utility model;

[0026] Figure 5 Schematic diagram of the change in the irradiation angle of the lamp beads in area C of a light-emitting device with uniform irradiation provided by an embodiment of the present utility model;

[0027] Figure 6 Schematic diagram of the change in the irradiation angle of the lamp beads in area D of a light-emitting device with uniform irradiation provided by an embodiment of the present utility model;

[0028] Figure 7 Graph of luminous intensity - field of view (FOV) of a light-emitting device with uniform irradiation provided by an embodiment of the present utility model;

[0029] Figure 8 Graph of luminous intensity - field of view (FOV) of a light-emitting device in the prior art.

[0030] Illustration: Light source module 1; PCB board 101; Lamp bead 102; Condensing module 2. Detailed implementation manners

[0031] An embodiment of the present utility model discloses a light-emitting device with uniform irradiation and a vision detection system, which are used to solve the technical problem of poor uniformity of the luminous intensity of the existing light-emitting device.

[0032] In order to enable those skilled in the art to better understand the solution of the present utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and specific implementation manners. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0033] Please refer to Figures 1 to 7 , a light-emitting device with uniform irradiation provided by an embodiment of the present utility model, comprising a condensing module 2 and a light source module 1;

[0034] Among them, the condensing module 2 is located on one side of the light-emitting surface of the light source module 1, and the condensing module 2 is arranged parallel to the light source module 1. The light source module 1 is used to emit light at different angles onto the condensing module 2, and the condensing module 2 is used to refract and converge the light at different angles.

[0035] In the lighting device of this embodiment, the light source module 1 can emit light at different angles onto the condensing module 2. After being refracted and converged by the condensing module 2, relatively uniform light is formed, and the illumination intensity is uniform everywhere within the effective illumination range of the lighting device, greatly improving the uniformity of the luminous intensity of the lighting device and effectively enhancing the imaging effect of the visual detection system.

[0036] Furthermore, the light source module 1 in this embodiment includes a PCB board 101 and a plurality of lamp beads 102;

[0037] The PCB board 101 is divided into an A area, a B area, a C area, and a D area along the direction from the end of the PCB board 101 to the middle of the PCB board 101. Among them, the plurality of lamp beads 102 are respectively arranged in the A area, the B area, the C area, and the D area, and the irradiation angles of the lamp beads 102 in the A area, the irradiation angles of the lamp beads 102 in the B area, the irradiation angles of the lamp beads 102 in the C area, and the irradiation angles in the D area are all different.

[0038] It should be noted that the plurality of lamp beads 102 in each area in this embodiment are arranged at intervals and are arranged in a straight line, and the number of lamp beads 102 in each area in this embodiment is not limited, and designers can select according to actual needs.

[0039] Specifically, the irradiation angle range of the lamp beads 102 in the A area in this embodiment is 20° to 30°.

[0040] It should be noted that the irradiation angle of the lamp beads 102 in the A area in this embodiment can be 20°, 25°, 30°, etc. This embodiment does not limit this, and designers can adjust the irradiation angle of the lamp beads 102 in the A area according to the actual situation.

[0041] The irradiation angle range of the lamp beads 102 in the B area in this embodiment is 50° to 60°.

[0042] It should be noted that the irradiation angle of the lamp beads 102 in the B area in this embodiment can be 50°, 55°, 60°, etc. This embodiment does not limit this, and designers can adjust the irradiation angle of the lamp beads 102 in the B area according to the actual situation.

[0043] In this embodiment, the illumination angle range of the lamp beads 102 in area C is from 70° to 80°.

[0044] It should be noted that the illumination angles of the lamp beads 102 in area C in this embodiment can be 70°, 75°, 80°, etc. This embodiment does not limit this, and designers can adjust the illumination angles of the lamp beads 102 in area C according to actual situations.

[0045] In this embodiment, the illumination angle range of the lamp beads 102 in area D is from 110° to 120°.

[0046] It should be noted that the illumination angles of the lamp beads 102 in area D in this embodiment can be 110°, 115°, 120°, etc. This embodiment does not limit this, and designers can adjust the illumination angles of the lamp beads 102 in area D according to actual situations.

[0047] Further, the light condensing module 2 in this embodiment is a light condensing rod.

[0048] It should be noted that the light condensing rod is a light-transmitting focusing structure, which can converge the light from the light source module 1 at various different illumination angles, effectively improve the degree of light convergence, is beneficial to reducing light loss, improving light utilization rate, and thus effectively improving the uniformity of the luminous intensity in the effective illumination area.

[0049] Specifically, the above-mentioned light condensing rod is a cylindrical structure extending along the length direction of the light-emitting surface of the light source module 1.

[0050] It should be noted that through the above design, it can be ensured that the light condensing rod can converge all the light emitted by the light source module 1.

[0051] Further, the light source module 1 in this embodiment further includes a heat dissipation bottom plate;

[0052] The heat dissipation bottom plate is arranged on the side surface of the PCB board 101 away from the lamp beads 102.

[0053] It should be noted that the heat dissipation bottom plate can be set as an aluminum metal plate with heat dissipation fins. Through the heat dissipation bottom plate, the working performance of the lamp beads 102 can be effectively improved, thereby effectively avoiding the influence of the lamp beads 102 on the working performance due to excessive temperature and ensuring the service life of the lamp beads 102.

[0054] Please refer to Figures 1 to 7 , a vision detection system provided by an embodiment of the present utility model includes a detection camera, a lens connected to the detection camera, and the above-mentioned evenly illuminating light-emitting device.

[0055] It should be noted that the lighting device is used to illuminate the surface to be detected of the workpiece, so that the surface to be detected of the workpiece is covered with evenly distributed light, and the detection camera and lens are used to obtain the light reflected from the surface to be detected of the workpiece, so as to complete imaging.

[0056] The above has introduced in detail a lighting device with uniform illumination and a vision detection system provided by the present utility model. For those of ordinary skill in the art, according to the idea of the embodiments of the present utility model, there will be changes in the specific implementation manners and application scopes. In summary, the content of this specification should not be construed as a limitation to the present utility model.

Claims

1. A lighting device for uniform illumination, characterized in that, It includes a condenser module (2) and a light source module (1); Among them, the condenser module (2) is located on one side of the light-emitting surface of the light source module (1), and the condenser module (2) is arranged parallel to the light source module (1). The light source module (1) is used to emit light rays at different angles onto the condenser module (2), and the condenser module (2) is used to refract and converge the light rays at different angles.

2. The light-emitting device for uniform illumination according to claim 1, wherein The light source module (1) includes a PCB board (101) and a plurality of lamp beads (102); The PCB board (101) is divided into an A area, a B area, a C area, and a D area along the direction from the end of the PCB board (101) to the middle of the PCB board (101). Among them, a plurality of the lamp beads (102) are respectively arranged in the A area, the B area, the C area, and the D area, and the irradiation angles of the lamp beads (102) in the A area, the irradiation angles of the lamp beads (102) in the B area, the irradiation angles of the lamp beads (102) in the C area, and the irradiation angles in the D area are all different.

3. The light-emitting device for uniform illumination according to claim 2, wherein, The irradiation angle range of the lamp beads (102) in the A area is 20° to 30°.

4. The evenly illuminating light-emitting device according to claim 2, wherein The irradiation angle range of the lamp beads (102) in the B area is 50° to 60°.

5. The light-emitting device for uniform illumination according to claim 2, wherein The irradiation angle range of the lamp beads (102) in the C area is 70° to 80°.

6. The light-emitting device for uniform illumination according to claim 2, wherein The irradiation angle range of the lamp beads (102) in the D area is 110° to 120°.

7. The uniform illumination lighting device according to claim 1, wherein The condenser module (2) is a condenser rod.

8. The evenly irradiating lighting device according to claim 7, wherein, The condenser rod is a cylindrical structure extending along the length direction of the light-emitting surface of the light source module (1).

9. The light-emitting device for uniform illumination according to claim 2, wherein The light source module (1) further includes a heat dissipation bottom plate; The heat dissipation bottom plate is arranged on the side of the PCB board (101) away from the lamp beads (102).

10. A vision detection system, characterized in that, It includes a detection camera, a lens connected to the detection camera, and a lighting device for uniform irradiation according to any one of claims 1 to 9.

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