AVI light source system and detection system for appearance detection of circuit board

Abstract

The utility model relates to the field of detection equipment, in particular to an AVI light source system for appearance detection of a circuit board and a detection system, the AVI light source system comprises a first light source and a second light source, and the inclination angles of the first light source and the second light source relative to the horizontal plane can be adjusted; light rays emitted by the first light source are emitted to the first light emitting plate and are emitted out, and light rays emitted by the second light source are emitted to the second light emitting plate and are emitted out; the detection system comprises an image acquisition device and the AVI light source system. According to the utility model, the inclination angles of the first light source and the second light source with the adjustable inclination angles are arranged and matched with different shooting angles of the camera to adjust the inclination angles of the light sources, so that various appearance defects of the circuit board can be shot, and the circuit board can be detected in all directions.

Description

Technical Field

[0001] The utility model relates to the field of detection equipment, and particularly to an AVI light source system and a detection system for circuit board appearance detection. Background Art

[0002] The AVI light source plays a crucial role in the Automatic Visual Inspection (AVI for short) system. The AVI system utilizes optical imaging and computer vision technologies. The light emitted by the light source irradiates the surface of the object to be detected, the reflected light is received, and through operations such as image sensor shooting and digital conversion, it is finally imaged on the computer display screen for image processing and defect recognition.

[0003] The circuit board AVI detection is a method for detecting the appearance defects of circuit boards using AVI technology. The existing AVI light source has overly concentrated light and insufficiently rich light angles. Therefore, it is difficult to photograph various defects during the circuit board detection process and it is difficult to conduct a full - range detection of the circuit board. Summary of the Utility Model

[0004] The purpose of the utility model is to overcome the deficiencies in the prior art that it is difficult to photograph various defects during the circuit board detection process by the existing AVI light source and it is difficult to conduct a full - range detection of the circuit board, and to provide an AVI light source system and a detection system for circuit board appearance detection.

[0005] In the first aspect, the utility model provides an AVI light source system for circuit board appearance detection, including

[0006] A first light source and a second light source, the inclination angles of the first light source and the second light source relative to the horizontal plane can be adjusted;

[0007] A first light - emitting plate and a second light - emitting plate, the light emitted by the first light source is incident on the first light - emitting plate and then emitted, and the light emitted by the second light source is incident on the second light - emitting plate and then emitted.

[0008] By setting the first light source and the second light source with adjustable inclination angles and cooperating with different shooting angles of the camera to adjust the inclination angles of the light sources, the utility model can photograph various appearance defects of the circuit board, thereby enabling a full - range detection of the circuit board.

[0009] Preferably, the AVI light source system further includes a first adjusting block, the first light source and the second light source are respectively installed on the first adjusting block, the first adjusting block can slide relative to the arc - shaped hole and is fixed by a fastener.

[0010] By providing a first adjusting block capable of sliding relative to the arc-shaped hole, the inclination angles of the first light source and the second light source can be conveniently adjusted.

[0011] Preferably, the first adjusting block includes a first adjusting unit and a second adjusting unit. The first adjusting unit is provided with an arc-shaped prism block and a first adjusting block strip hole. The arc-shaped prism block can slide relative to the arc-shaped hole, and the second adjusting unit can slide along the length direction of the first adjusting block strip hole and is fixed by a fastener.

[0012] Preferably, the AVI light source system further includes a third light source, and the light emitted by the third light source is projected onto the first light-emitting plate or the second light-emitting plate and then emitted. By providing the third light source, the brightness of the light can be increased, and an additional degree of freedom for adjustment is added, facilitating the detection of various appearance defects.

[0013] Preferably, the AVI light source system further includes a second adjusting block, and the third light source is installed on the second adjusting block. The second adjusting block can slide relative to the strip hole and is fixed by a fastener.

[0014] By providing a second adjusting block that slides relative to the strip hole, the position of the third light source can be conveniently adjusted.

[0015] Preferably, the second adjusting block includes a third adjusting unit and a fourth adjusting unit. The third adjusting unit is provided with a strip-shaped prism block and a second adjusting block strip hole. The strip-shaped prism block can slide relative to the strip hole, and the fourth adjusting unit can slide along the length direction of the second adjusting block strip hole and is fixed by a fastener.

[0016] Preferably, the light source can emit white light, red light, blue light, green light, or infrared light.

[0017] By providing a light source capable of emitting light of different colors, different color light sources can be used to detect different defects, meeting the detection requirements for different circuit board appearance defects.

[0018] Preferably, a microstructure film is provided on the light-emitting surface of the light source.

[0019] By providing the microstructure film, further uniformization of light emission can be achieved, reducing bright and dark stripes, improving the picture clarity, and enhancing the detection accuracy.

[0020] Preferably, the microstructure of the microstructure film is an arc-shaped protrusion.

[0021] In a second aspect, the present invention provides a circuit board appearance detection system, including an image acquisition device and any one of the AVI light source systems for circuit board appearance detection described above.

[0022] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0023] By setting the first light source and the second light source with adjustable tilt angles and coordinating with different shooting angles of the camera to adjust the tilt angles of the light sources, the present utility model can capture various appearance defects of the circuit board, thereby enabling a comprehensive inspection of the circuit board. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 FIG. is a three-dimensional structural schematic diagram of the AVI light source system described in the present utility model.

[0025] Figure 2 FIG. is a three-dimensional structural schematic diagram of the AVI light source system with some of its housing hidden.

[0026] Figure 3 is Figure 2 front view of.

[0027] Figure 4 FIG. is a three-dimensional structural schematic of the first adjusting block described in the present utility model Figure 1 .

[0028] Figure 5 FIG. is a three-dimensional structural schematic of the first adjusting block described in the present utility model Figure 2 .

[0029] Figure 6 FIG. is a three-dimensional structural schematic diagram of the second adjusting block described in the present utility model.

[0030] Figure 7 FIG. is a three-dimensional structural schematic diagram of the third adjusting unit described in the present utility model.

[0031] Figure 8 FIG. is a three-dimensional structural schematic diagram of the fourth adjusting unit described in the present utility model.

[0032] Reference numerals in the figures:

[0033] 11 - first light source, 12 - second light source, 13 - third light source,

[0034] 21 - first light-emitting plate, 22 - second light-emitting plate,

[0035] 31 - first adjusting block, 311 - first adjusting unit, 3111 - arc-shaped edge block, 3112 - first adjusting block strip hole, 312 - second adjusting unit,

[0036] 32 - second adjusting block, 321 - third adjusting unit, 3211 - strip-shaped edge block, 3212 - second adjusting block strip hole, 322 - fourth adjusting unit,

[0037] 4 - Arc-shaped hole, 5 - Strip-shaped hole, 6 - Fastener, 7 - Housing. Detailed implementation manner

[0038] The following further describes the present utility model in detail in combination with specific embodiments. However, this should not be construed as limiting the scope of the above-mentioned subject matter of the present utility model to the following embodiments. All technologies implemented based on the content of the present utility model belong to the scope of the present utility model.

[0039] In the description of the specific embodiments of the present utility model, without special explanation, the expression terms indicating the orientation or positional relationship such as "upper", "lower", "left", "right", "center", "inner", "outer", etc. are all based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship when the product / device / equipment of the utility model is usually used. These terms of orientation or positional relationship are only for the convenience of describing the solution of the present utility model or simplifying the description in the specific embodiments, so as to facilitate technicians to quickly understand the solution, rather than indicating or implying that a specific device / component / element must have a specific orientation, or be constructed and operated in a specific positional relationship. Therefore, it should not be understood as a limitation to the present utility model.

[0040] In addition, if terms such as "horizontal", "vertical", "hanging", "parallel", etc. appear, it does not mean that the corresponding device / component / element is required to be absolutely horizontal or vertical or hanging or parallel, but can be slightly inclined or have a deviation. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined. Or, it can be simply understood that the corresponding device / component / element is arranged in the directions of "horizontal", "vertical", "hanging", "parallel", etc., and can have an error / deviation of ±10% relative to the corresponding direction setting, more preferably within ±8%, more preferably within ±6%, more preferably within ±5%, more preferably within ±4%. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its function in the solution of the present utility model.

[0041] In addition, the expressions such as "first", "second", "third", etc. in the terms are only used to distinguish the description of the same or similar components, and should not be understood as emphasizing or implying the relative importance of specific components.

[0042] In addition, in the description of the embodiments of the present utility model, "several", "multiple", "a number of" represent at least 2. It can be any situation such as 2, 3, 4, 5, 6, 7, 8, 9, etc., or even more than 9.

[0043] In addition, in the description of the technical solution of the present utility model, unless otherwise clearly specified / defined / restricted, the terms "set", "installed", "connected", "linked", "provided with", "laid", "arranged" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection. It can be connection means commonly used in the art such as welding, riveting, bolting, threaded connection, etc. Such a connection can be a mechanical connection, an electrical connection or a communication connection; it can be directly connected or indirectly connected through an intermediate medium, and can be the communication inside two components.

[0044] Embodiment 1

[0045] As Figures 1-3 shown, an AVI light source system for detecting the appearance of a circuit board includes a first light source 11, a second light source 12, a first light output board 21, and a second light output board 22. The inclination angles of the first light source 11 and the second light source 12 relative to the horizontal plane can be adjusted; the light emitted by the first light source 11 is projected onto the first light output board 21 and then emitted, and the light emitted by the second light source 12 is projected onto the second light output board 22 and then emitted.

[0046] By providing the first light source 11 and the second light source 12 with adjustable inclination angles and cooperating with different shooting angles of the camera, the present invention can adjust the inclination angles of the first light source 11 and the second light source 12, so as to be able to photograph various appearance defects of the circuit board and perform a comprehensive inspection on the circuit board.

[0047] As Figures 4-5 shown, in some embodiments, the adjustment of the inclination angles of the first light source 11 and the second light source 12 can be achieved by providing a first adjusting block 31. Specifically, first adjusting blocks 31 can be provided at both ends of the first light source 11 and the second light source 12. An arc-shaped hole 4 can be provided in the housing 7 of the AVI light source system, and the first adjusting block 31 can be set to be slidable relative to the arc-shaped hole 4, so as to be able to adjust the position of the first adjusting block 31 relative to the arc-shaped hole 4. After adjusting to the appropriate position, it is fixed by a fastener 6. In this way, by adjusting the position of the first adjusting block 31 relative to the arc-shaped hole 4, the inclination angles of the first light source 11 and the second light source 12 can be adjusted, and the adjustment is relatively convenient and the adjustment range is relatively large.

[0048] In a further embodiment, the first adjusting block 31 may include a first adjusting unit 311 and a second adjusting unit 312. The first adjusting unit 311 is provided with an arc-shaped rib block 3111, the shape of the arc-shaped rib block 3111 is adapted to the arc-shaped hole 4, the arc-shaped rib block 3111 can slide relative to the arc-shaped hole 4, and the first adjusting unit 311 is further provided with a first adjusting block strip hole 3112. The second adjusting unit 312 can slide along the length direction of the first adjusting block strip hole 3112 and is fixed by a fastener 6. In this way, the tilt angle of the first light source 11 can be adjusted by sliding the first adjusting unit 311 relative to the arc-shaped hole 4, and the front and rear positions of the first light source 11 can be adjusted by sliding the second adjusting unit 312 relative to the first adjusting block strip hole 3112. Therefore, by providing the first adjusting block strip hole 3112, an additional degree of freedom for adjustment is added, which facilitates the combined adjustment of the arc-shaped hole 4 and the first adjusting block strip hole 3112 to achieve a richer variety of tilt angles, so as to adapt to the detection requirements of various appearance defects (different depths, sizes, etc.) of the circuit board.

[0049] In some embodiments, a third light source 13 may further be included, and the light emitted by the third light source 13 is projected onto the first light-emitting plate 21 or the second light-emitting plate 22 and then emitted. By providing the third light source 13, the brightness of the light can be increased, and an additional degree of freedom for adjustment is also added, which facilitates the detection of various appearance defects. For example, the third light source 13 may also be set to be position-adjustable, as Figures 6-8 shown, second adjusting blocks 32 may be respectively provided at both ends of the third light source 13, a strip hole 5 is provided in the housing 7, and the second adjusting blocks 32 are set to be able to slide relative to the strip hole 5, so that the position of the second adjusting blocks 32 relative to the strip hole 5 can be adjusted. After adjusting to a suitable position, it is fixed by a fastener 6. In this way, by adjusting the position of the second adjusting blocks 32 relative to the strip hole 5, the position of the third light source 13 can be adjusted, and the adjustment is relatively convenient and the adjustment range is large.

[0050] In a further embodiment, the second adjusting block 32 may include a third adjusting unit 321 and a fourth adjusting unit 322. The third adjusting unit 321 is provided with a strip-shaped edge block 3211 which is adapted to the strip-shaped hole 5. The strip-shaped edge block 3211 can slide relative to the strip-shaped hole 5. The third adjusting unit 321 is further provided with a strip-shaped hole 3212 of the second adjusting block. The fourth adjusting unit 322 can slide along the length direction of the strip-shaped hole 3212 of the second adjusting block and is fixed by a fastener 6 after sliding to a proper position. In this way, by sliding the third adjusting unit 321 relative to the strip-shaped hole 5, the position of the third light source 13 in the horizontal plane can be adjusted, for example, the left and right positions of the third light source 13 can be adjusted. By sliding the fourth adjusting unit 322 relative to the strip-shaped hole 3212 of the second adjusting block, the position of the third light source 13 in the horizontal plane can be adjusted again, for example, the front and back positions of the third light source 13 can be adjusted. Therefore, by providing the combined adjusting structure of the strip-shaped hole 5 and the strip-shaped hole 3212 of the second adjusting block, the precise adjustment of the horizontal position of the third light source 13 can be realized, so as to adapt to the detection requirements of various appearance defects (different depths, sizes, etc.) of the circuit board.

[0051] In some embodiments, the first light source 11, the second light source 12, and the third light source 13 can emit light rays of multiple colors. For example, they can emit white light, red light, blue light, green light, or infrared light. One light source can also emit multiple light rays at the same time, or several light sources can cooperate to emit multiple light rays. By providing light sources that can emit light rays of different colors, different color light sources can be used to detect different defects, and the detection requirements of different circuit board appearance defects can be met.

[0052] In some embodiments, a microstructure film can be provided on the light-emitting surfaces of the first light source 11, the second light source 12, and the third light source 13. The microstructure film can achieve a light homogenization effect, thereby improving the image quality and increasing the detection accuracy. For example, the microstructure of the microstructure film can be an arc-shaped protrusion.

[0053] Embodiment 2

[0054] A circuit board appearance detection system includes an image acquisition device and also includes an AVI light source system for circuit board appearance detection as described in Embodiment 1.

[0055] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An AVI light source system for circuit board appearance detection, characterized in that, Comprising a first light source (11) and a second light source (12), the inclination angles of the first light source (11) and the second light source (12) relative to the horizontal plane being adjustable; a first light-emitting plate (21) and a second light-emitting plate (22), the light emitted by the first light source (11) being incident on the first light-emitting plate (21) and then emitted, and the light emitted by the second light source (12) being incident on the second light-emitting plate (22) and then emitted.

2. The AVI light source system for detecting the appearance of a circuit board according to claim 1, wherein Comprising a first adjusting block (31), the first light source (11) and the second light source (12) being respectively mounted on the first adjusting block (31), the first adjusting block (31) being capable of sliding relative to the arc-shaped hole (4) and being fixed by a fastener.

3. The AVI light source system for detecting the appearance of a circuit board according to claim 2, wherein, The first adjusting block (31) comprises a first adjusting unit (311) and a second adjusting unit (312). The first adjusting unit (311) is provided with an arc-shaped edge block (3111) and is provided with a first adjusting block strip-shaped hole (3112). The arc-shaped edge block (3111) is capable of sliding relative to the arc-shaped hole (4), and the second adjusting unit (312) is capable of sliding along the length direction of the first adjusting block strip-shaped hole (3112) and being fixed by a fastener.

4. The AVI light source system for detecting the appearance of a circuit board according to claim 1, wherein, Further comprising a third light source (13), the light emitted by the third light source (13) being incident on the first light-emitting plate (21) or the second light-emitting plate (22) and then emitted.

5. The AVI light source system for detecting the appearance of a circuit board according to claim 4, characterized in that, Comprising a second adjusting block (32), the third light source (13) being mounted on the second adjusting block (32), the second adjusting block (32) being capable of sliding relative to the strip-shaped hole (5) and being fixed by a fastener (6).

6. The AVI light source system for circuit board appearance detection according to claim 5, wherein The second adjusting block (32) comprises a third adjusting unit (321) and a fourth adjusting unit (322). The third adjusting unit (321) is provided with a strip-shaped edge block (3211) and is provided with a second adjusting block strip-shaped hole (3212). The strip-shaped edge block (3211) is capable of sliding relative to the strip-shaped hole (5), and the fourth adjusting unit (322) is capable of sliding along the length direction of the second adjusting block strip-shaped hole (3212) and being fixed by a fastener (6).

7. The AVI light source system for circuit board appearance detection according to claim 1, characterized in that The light source can emit white light, red light, blue light, green light or infrared light.

8. An AVI light source system for detecting the appearance of a circuit board according to any one of claims 1-7, characterized in that, The light-emitting surface of the light source is provided with a microstructure film.

9. The AVI light source system for detecting the appearance of a circuit board according to claim 8, characterized in that, The microstructure of the microstructure film is an arc-shaped protrusion.

10. A circuit board appearance detection system, comprising an image acquisition device, characterized in that, Further comprising an AVI light source system for detecting the appearance of a circuit board according to any one of claims 1-9.

Images