A semi-circular arc linear coaxial illumination light source

Abstract

The utility model discloses a kind of semi-circular arc linear coaxial lighting light source, including light source body, the light source body includes semicircular base, semicircular base is equipped with semicircular PCB board, multiple LED lamp beads are evenly distributed on the semicircular PCB board, semicircular light bar is equipped in the front of LED lamp bead, upper cover is equipped on the upper portion of semicircular base, the upper cover and semicircular base will semicircular PCB board, LED lamp bead and semicircular light bar buckle and fix;Upper cover and semicircular base one side is also equipped with diffuser plate, the diffuser plate is located semicircular light bar light emitting side, slanted beam splitter is equipped in the side of diffuser plate, the beam splitter is reflected to the surface of object to be detected below by light;The reflected light of the surface of object to be detected passes through upper cover, and is photographed and received by camera on the upper portion of light source body;The utility model greatly reduces the thickness of light source, effectively improves the detection efficiency to long strip area.

Description

Technical Field

[0001] This utility model relates to the field of light source technology, and in particular to a semi-circular arc linear coaxial lighting source. Background Technology

[0002] In the field of PCB soldering, high-precision vision inspection systems are crucial for identifying minute surface defects such as scratches, pits, foreign objects, and poor solder joints. Furthermore, for smooth, reflective surfaces such as copper foil, pads, wafers, and chip packages, coaxial illumination technology is required to achieve high-contrast imaging to highlight microscopic surface deformations.

[0003] Existing coaxial light sources use a cubic structure, which requires a rectangular LED array inside and a beam splitter outside, resulting in an excessively large axial dimension that is difficult to integrate into space-constrained detection equipment.

[0004] If the above structure is miniaturized and integrated, and high-power LEDs are densely arranged in an enclosed space, a complex heat dissipation structure needs to be designed to avoid heat accumulation affecting the stability and lifespan of the light source, which leads to increased manufacturing costs.

[0005] When it is necessary to inspect PCB board pin solder joints and semiconductor long strip connection areas, traditional point, rectangular and ring coaxial light sources need to be moved multiple times or take multiple pictures and stitched together, resulting in low inspection efficiency and making it difficult to meet the needs of real-time and efficient inspection. Utility Model Content

[0006] The purpose of this invention is to overcome the shortcomings of existing technologies, such as large size and unsuitability for linear detection scenarios, and to provide a semi-circular arc linear coaxial illumination source. By adopting a semi-circular arc linear structure design, the thickness of the light source can be greatly reduced while maintaining illumination uniformity and coaxiality, effectively improving the detection efficiency for long strip areas.

[0007] To achieve the above objectives, this utility model provides a semi-circular linear coaxial lighting source, comprising a light source body, the light source body including a semi-circular base, a semi-circular PCB board mounted on the semi-circular base, a plurality of LED beads evenly distributed on the semi-circular PCB board, a semi-circular focusing rod mounted in front of the LED beads, a top cover mounted on the upper part of the semi-circular base, the top cover and the semi-circular base fastening and fixing the semi-circular PCB board, LED beads and semi-circular focusing rod; a diffuser plate is also mounted on one side of the top cover and the semi-circular base, the diffuser plate being located on the light-emitting side of the semi-circular focusing rod, an inclined beam splitter mounted on one side of the diffuser plate, the beam splitter reflecting light onto the surface of the object to be detected below; the reflected light from the surface of the object to be detected passes through the top cover and is captured and received by a camera on the upper part of the light source body.

[0008] Preferably, the upper cover is provided with a sixth groove, the lower part of the sixth groove is provided with an intensifying lens, and the lower part of the intensifying lens is provided with a beam splitter. The reflected light from the surface of the object to be detected passes through the beam splitter and the intensifying lens in sequence and is captured and received by the camera on the upper part of the light source body.

[0009] Preferably, the upper cover includes an upper cover plane and a first vertical side surface disposed on the side of the upper cover plane; the first vertical side surface is fixedly connected to the lower semi-circular base, and the lower part of the upper cover plane and the upper part of the semi-circular base are both provided with a first protrusion, the first protrusion, the upper cover plane, the semi-circular base and the first vertical side surface forming a first receiving groove; a thermally conductive silicone pad is attached to one side of the semi-circular PCB board, and both the semi-circular PCB board and the thermally conductive silicone pad are installed inside the first receiving groove, and the thermally conductive silicone pad transfers the heat generated by the semi-circular PCB board to the first vertical side surface.

[0010] Preferably, the lower part of the upper cover plane is provided with a first groove, and the semi-circular base is provided with a second groove. The first groove and the second groove are arranged opposite to each other, and the first groove and the second groove form a second receiving groove. The semi-circular focusing rod is installed inside the second receiving groove.

[0011] Preferably, a first through hole is provided on the first vertical side, and the light source body also includes a power line, which passes through the first through hole and is electrically connected to the semi-circular PCB board to drive the LED beads to emit light.

[0012] Preferably, the lower part of the diffuser plate is fixedly connected to the semi-circular base by connecting bolts, and the upper part of the diffuser plate is fixedly connected to the lower part of the upper cover plane by connecting bolts.

[0013] Preferably, the beam splitter has a tilt angle of 45°, and its surface is coated with a coating having a reflectance / transmittance ratio of 70 / 30. A second vertical side is mounted on the side of the upper cover plane away from the first vertical side, and a third groove is provided at the lower part of the second vertical side. A fourth groove is provided at the lower part of the upper cover plane. The lower part of the beam splitter is mounted inside the third groove, and the upper part is mounted inside the fourth groove.

[0014] Preferably, the light source body further includes a first end plate mounted on one side of the upper cover plane and a second end plate mounted on the other side of the upper cover plane; the first end plate and the second end plate are fixedly connected to the upper cover plane by bolts; the inner sides of the first end plate and the second end plate are provided with an inclined fifth groove, and both ends of the beam splitter are inserted into the fifth groove.

[0015] Preferably, the lower part of the sixth groove is provided with a third receiving groove, and the lens is attached to the inside of the third receiving groove and is limited by the third receiving groove.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0017] The semi-circular PCB board and the semi-circular focusing rod of this invention have matching arc-shaped structures. The LED beads on the semi-circular PCB board emit light outwards, which is then converged by the semi-circular focusing rod to form a uniform surface light source. The light is further scattered by a diffuser plate, making the light softer and more evenly distributed. The light is reflected onto the surface of the object to be inspected below by a beam splitter. The reflected light from the surface of the object to be inspected passes through the top cover and is captured by a camera on the upper part of the light source body. The camera completes image acquisition by receiving the reflected light, realizing accurate detection of defects on the object surface. The semi-circular structure of the light source body significantly reduces the vertical thickness of the light source, making it easy to install and use in space-constrained environments. At the same time, it improves light utilization efficiency and maintains illumination uniformity and coaxiality. The arc-shaped light is converted into coaxial light that propagates in a straight line. After being reflected by the beam splitter, it is vertically illuminated onto the surface of the object to be inspected, forming a long strip of illumination area, which effectively improves the detection efficiency of the long strip area. Attached Figure Description

[0018] 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.

[0019] Figure 1 This is a schematic diagram of the structure of a semi-circular arc linear coaxial lighting source provided by this utility model;

[0020] Figure 2 This is a schematic diagram of the optical path of a semi-circular arc linear coaxial lighting source provided by this utility model;

[0021] Figure 3 This is a cross-sectional view of a semi-circular arc linear coaxial lighting source provided by this utility model;

[0022] Figure 4 This is a cross-sectional view of the semi-circular base and the top cover provided by this utility model assembled together;

[0023] Figure 5 This is a schematic diagram of the semi-circular base provided by this utility model;

[0024] Figure 6 This is a schematic diagram of the structure of the top cover provided by this utility model;

[0025] Figure 7This is a schematic diagram of the semi-circular PCB board and LED beads provided by this utility model;

[0026] Figure 8 This is a schematic diagram of a semi-circular arc linear coaxial lighting source with a semi-circular base removed, provided by this utility model.

[0027] Figure 9 This is a schematic diagram of the structure of the first end plate provided by this utility model.

[0028] The diagram includes:

[0029] 10. Light source body; 1. Semi-circular base; 2. Semi-circular PCB board; 3. LED beads; 4. Semi-circular focusing rod; 5. Top cover; 6. Diffuser plate; 7. Beam splitter; 8. Object to be detected; 9. Camera; 55. Sixth groove; 54. Intensifying lens; 51. Top cover plane; 52. First vertical side; 12. First receiving groove; 13. Thermal conductive silicone pad; 14. First groove; 15. Second groove; 16. Second receiving groove; 521. First through hole; 71. Power cord; 53. Second vertical side; 531. Third groove; 511. Fourth groove; 17. First end plate; 18. Second end plate; 19. Fifth groove; 512. Third receiving groove; 11. First protrusion. Detailed Implementation

[0030] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are one embodiment of the present invention, and not all embodiments. Based on the embodiments 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.

[0031] Please refer to Figures 1 to 9 This utility model provides a semi-circular arc linear coaxial lighting source.

[0032] like Figure 1 As shown, the semi-circular linear coaxial lighting source includes a light source body 10. The light source body 10 includes a semi-circular base 1 installed at the lower part and an upper cover 5 installed at the upper part. The upper cover 5 and the semi-circular base 1 form a receiving space for installing a semi-circular PCB board 2, LED beads 3, thermally conductive silicone pad 13 and a semi-circular focusing rod 4.

[0033] In this embodiment, the semi-circular base 1 has a semi-circular structure, and the upper cover 5 also has a semi-circular structure that matches the semi-circular base 1. However, the two are not completely identical. The upper cover 5 is longer on one side because it needs to be fitted with an inclined beam splitter 7.

[0034] like Figure 7 As shown, a semi-circular PCB board 2 is mounted on the semi-circular base 1. Multiple LED beads 3 are evenly distributed on one side of the semi-circular PCB board 2, and a thermally conductive silicone pad 13 is attached to the other side to dissipate the heat generated by the LED beads 3 during operation and ensure that the light source operates stably for a long time.

[0035] A semi-circular focusing rod 4 is installed in front of the LED beads 3. The semi-circular focusing rod 4 focuses the light emitted by the LED beads 3 and projects it in a coaxial direction. A diffuser plate 6 is also installed on one side of the upper cover 5 and the semi-circular base 1. The diffuser plate 6 is located on the light-emitting side of the semi-circular focusing rod 4 and is used to evenly diffuse the light and improve the softness and uniformity of the illumination. An inclined beam splitter 7 is installed on one side of the diffuser plate 6. The beam splitter 7 reflects part of the light onto the surface of the object to be detected 8 to achieve a coaxial illumination effect. The remaining light is received by the camera 9 to form a high-contrast image.

[0036] like Figure 1 As shown, the light reflected downward by the beam splitter 7 is elongated, which can detect surface defects of elongated objects, such as scratches on the gold fingers of memory modules and straight solder joint defects on PCB boards.

[0037] Since the beam splitter 7 is elongated, the reflected light is also elongated. Therefore, the upper part of the beam splitter 7 is provided with an elongated sixth groove 55. The sixth groove 55 is set on the upper cover 5 to facilitate the passage of reflected light from the surface of the object to be tested 8. Furthermore, an intensifying lens 54 is installed at the lower part of the sixth groove 55, and the beam splitter 7 is installed at the lower part of the intensifying lens 54. The reflected light from the surface of the object to be tested 8 passes through the beam splitter 7 and the intensifying lens 54 in sequence and is captured and received by the camera 9 on the upper part of the light source body 10. This design not only ensures the coaxiality of the illumination optical path, but also improves the imaging clarity and detection accuracy.

[0038] like Figure 3 As shown, the upper cover 5 includes an upper cover plane 51 and a first vertical side 52 disposed on the side of the upper cover plane 51; the upper cover plane 51 and the first vertical side 52 are perpendicular to each other, forming an L-shaped cross-section structure. Further, the first vertical side 52 is fixedly connected to the semi-circular base 1 by bolts; further still, the lower part of the upper cover plane 51 and the upper part of the semi-circular base 1 are provided with a first protrusion 11, and the first protrusion 11, the upper cover plane 51, the semi-circular base 1 and the first vertical side 52 form a first receiving groove 12; a thermally conductive silicone pad 13 is attached to one side of the semi-circular PCB board 2, and the semi-circular PCB board 2 and the thermally conductive silicone pad 13 are both installed inside the first receiving groove 12. The thermally conductive silicone pad 13 transfers the heat generated by the semi-circular PCB board 2 to the first vertical side 52.

[0039] The first protrusion 11 acts as a limiter, restricting the movement of the semi-circular PCB board 2 to ensure its accurate and stable position during assembly, preventing displacement due to vibration or external force. The thermally conductive silicone pad 13 fits tightly against the semi-circular PCB board 2 and the first vertical side 52, significantly improving heat conduction efficiency, effectively reducing the operating temperature of the LED beads 3, and extending the lifespan of the light source.

[0040] To further optimize heat dissipation, the outer wall of the first vertical side 52 is designed with several longitudinal heat dissipation fins to increase the contact area with air and promote natural convection heat dissipation.

[0041] like Figure 5 and Figure 6 As shown, the lower part of the upper cover plane 51 is provided with a first groove 14, and the semi-circular base 1 is provided with a second groove 15. The first groove 14 and the second groove 15 are arranged opposite to each other, and the first groove 14 and the second groove 15 form a second receiving groove 16. The semi-circular focusing rod 4 is installed inside the second receiving groove 16.

[0042] like Figure 8 As shown, a first through hole 521 is provided on the first vertical side 52. The light source body 10 also includes a power line 71. The power line 71 passes through the first through hole 521 and is electrically connected to the semi-circular PCB board 2 to drive the LED beads 3 to emit light. After passing through the first through hole 521, the power line 71 is sealed with potting compound to prevent external dust or moisture from entering the interior of the light source body and to ensure the long-term stability of the electrical connection.

[0043] In order to seal the light source body 10, the diffuser plate 6 seals the light emission outlet of the light source body 10. The lower part of the diffuser plate 6 is fixedly connected to the semi-circular base 1 by connecting bolts, and the upper part of the diffuser plate 6 is fixedly connected to the lower part of the upper cover plane 51 by connecting bolts. The diffuser plate 6 seals the light emission outlet, and at the same time, the light is evenly diffused by the diffuser plate 6.

[0044] In this embodiment, the beam splitter 7 is tilted at an angle of 45°, the LED bead 3 is located on the right side and emits light to the left side. With the 45° beam splitter 7, the light path is folded on one side to achieve coaxial output. The light source body 10 can reduce the vertical height by 30%-50% and can be directly embedded in a narrow detection station, breaking through the limitations of equipment space.

[0045] Furthermore, the surface of the beam splitter 7 is coated with a coating with a reflectance / transmittance ratio of 70 / 30; this can significantly reduce light loss, improve the overall light efficiency of the system by more than 40%, reduce power consumption under the same illuminance, and clearly identify scratches ≤5μm in PCB pad inspection; and improve the imaging contrast of particulate contaminants ≥0.2μm by more than 2 times in wafer surface inspection.

[0046] like Figure 1 and Figure 2 As shown, a second vertical side 53 is installed on the side of the upper cover plane 51 away from the first vertical side 52. The upper cover plane 51 and the second vertical side 53 are fixedly connected by bolts. A third groove 531 is provided at the lower part of the second vertical side 53, and a fourth groove 511 is provided at the lower part of the upper cover plane 51. The third groove 531 and the fourth groove 511 are arranged diagonally to accommodate an inclined beam splitter 7. Specifically, the lower part of the beam splitter 7 is installed inside the third groove 531, and the upper part is installed inside the fourth groove 511.

[0047] To further secure the beam splitter 7, the beam splitter 7 is installed between the first end plate 17 and the second end plate 18. Specifically, the first end plate 17 is installed on one side of the upper cover plane 51, and the second end plate 18 is installed on the other side of the upper cover plane 51. The first end plate 17 and the second end plate 18 are fixedly connected to the upper cover plane 51 and the second vertical side 53 by bolts. The inner sides of the first end plate 17 and the second end plate 18 are provided with inclined fifth grooves 19, and both ends of the beam splitter 7 are inserted into the fifth grooves 19. In the final assembly step, the beam splitter 7 is horizontally inserted into the third groove 531 and the fourth groove 511, and is limited and fixed by the first end plate 17 and the second end plate 18.

[0048] In order to fix the intensifying lens 54 and prevent it from loosening, the lower part of the sixth groove 55 is provided with a third receiving groove 512. The intensifying lens 54 is attached to the inside of the third receiving groove 512 and is limited by the third receiving groove 512.

[0049] The assembly steps of the light source body 10;

[0050] Step S1: Assemble and install the semi-circular PCB board 2 and LED beads 3. Distribute the LED beads 3 evenly on the semi-circular PCB board 2. Attach the thermal conductive silicone pad 13 to the back of the semi-circular PCB board 2. Place the semi-circular PCB board 2 and LED beads 3 on one side of the first protrusion 11 for easy positioning and fixing later.

[0051] Step S2: Install power cord 71, which passes through the first through hole 521 and is electrically connected to the semi-circular PCB board 2 to drive the LED beads 3 to emit light;

[0052] Step S3: Install the semi-circular focusing rod 4, which is placed on the second groove 15;

[0053] Step S4: Install the top cover 5, and fix the first vertical side 52 to the semi-circular base 1 with bolts; form a first receiving groove 12 for accommodating the semi-circular PCB board 2, LED beads 3 and thermal conductive silicone pad 13, and a second receiving groove 16 for accommodating the semi-circular focusing rod 4.

[0054] Step S5: Install the diffuser plate 6. The lower part of the diffuser plate 6 is fixedly connected to the semi-circular base 1 by connecting bolts, and the upper part of the diffuser plate 6 is fixedly connected to the lower part of the upper cover plane 51 by connecting bolts.

[0055] Step S6: Install the intensifying lens 54, which is attached to the inside of the third receiving groove 512 and is limited by the third receiving groove 512;

[0056] Step S7: Install the second vertical side 53, and the upper cover plane 51 and the second vertical side 53 are fixedly connected by bolts;

[0057] Step S8: Install beam splitter 7, the lower part of which is installed inside the third groove 531 and the upper part is installed inside the fourth groove 511;

[0058] Step S9: Install the first end plate 17 and the second end plate 18. The first end plate 17 is fixedly connected to one side of the upper cover plane 51 and the second vertical side 53 by bolts. The second end plate 18 is fixedly connected to the other side of the upper cover plane 51 and the second vertical side 53 by bolts. Both ends of the beam splitter 7 are inserted into the fifth groove 19, thereby completing the assembly of the light source body 10.

[0059] The above embodiments are preferred embodiments of the present utility model, but the embodiments of the present utility model are not limited to the above embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present utility model shall be considered equivalent substitutions and shall be included within the protection scope of the present utility model.

Claims

1. A semi-circular arc linear coaxial illumination source, characterized in that: The system includes a light source body (10), which includes a semi-circular base (1). A semi-circular PCB board (2) is mounted on the semi-circular base (1). Multiple LED beads (3) are evenly distributed on the semi-circular PCB board (2). A semi-circular focusing rod (4) is mounted in front of the LED beads (3). A top cover (5) is mounted on the upper part of the semi-circular base (1). The top cover (5) and the semi-circular base (1) together hold the semi-circular PCB board (2) and the LED beads together. (3) and the semi-circular focusing rod (4) are fastened together; the upper cover (5) and the semi-circular base (1) are also equipped with a diffuser plate (6), the diffuser plate (6) is located on the light-emitting side of the semi-circular focusing rod (4), and the diffuser plate (6) is equipped with an inclined beam splitter (7) on one side, the beam splitter (7) reflects the light onto the surface of the object to be tested (8) below; the reflected light from the surface of the object to be tested (8) passes through the upper cover (5) and is photographed and received by the camera (9) on the upper part of the light source body (10).

2. The semi-circular arc linear coaxial lighting source according to claim 1, characterized in that: The upper cover (5) is provided with a sixth groove (55), and an intensifying lens (54) is installed at the lower part of the sixth groove (55). A beam splitter (7) is installed at the lower part of the intensifying lens (54). The reflected light from the surface of the object to be detected (8) passes through the beam splitter (7) and the intensifying lens (54) in sequence and is captured and received by the camera (9) on the upper part of the light source body (10).

3. The semi-circular arc linear coaxial lighting source according to claim 1, characterized in that: The upper cover (5) includes an upper cover plane (51) and a first vertical side (52) disposed on the side of the upper cover plane (51); the first vertical side (52) is fixedly connected to the lower semi-circular base (1), and the lower part of the upper cover plane (51) and the upper part of the semi-circular base (1) are provided with a first protrusion (11), the first protrusion (11), the upper cover plane (51), the semi-circular base (1) and the first vertical side (52) form a first receiving groove (12); a thermally conductive silicone pad (13) is attached to one side of the semi-circular PCB board (2), and the semi-circular PCB board (2) and the thermally conductive silicone pad (13) are both installed inside the first receiving groove (12), and the thermally conductive silicone pad (13) transfers the heat generated by the semi-circular PCB board (2) to the first vertical side (52).

4. A semi-circular arc linear coaxial lighting source according to claim 3, characterized in that: The lower part of the upper cover plane (51) is provided with a first groove (14), and the semi-circular base (1) is provided with a second groove (15). The first groove (14) and the second groove (15) are arranged opposite to each other, and the first groove (14) and the second groove (15) form a second receiving groove (16). The semi-circular focusing rod (4) is installed inside the second receiving groove (16).

5. A semi-circular arc linear coaxial illumination source according to claim 3, characterized in that: The first vertical side (52) is provided with a first through hole (521). The light source body (10) also includes a power line (71). The power line (71) passes through the first through hole (521) and is electrically connected to the semi-circular PCB board (2) to drive the LED beads (3) to emit light.

6. A semi-circular arc linear coaxial illumination source according to claim 3, characterized in that: The lower part of the diffuser plate (6) is fixedly connected to the semi-circular base (1) by connecting bolts, and the upper part of the diffuser plate (6) is fixedly connected to the lower part of the upper cover plane (51) by connecting bolts.

7. A semi-circular arc linear coaxial illumination source according to claim 6, characterized in that: The tilt angle of the beam splitter (7) is 45°. The surface of the beam splitter (7) is coated with a coating with a reflectance / transmittance ratio of 70 / 30. A second vertical side (53) is installed on the side of the upper cover plane (51) away from the first vertical side (52). A third groove (531) is provided at the lower part of the second vertical side (53). A fourth groove (511) is provided at the lower part of the upper cover plane (51). The lower part of the beam splitter (7) is installed inside the third groove (531), and the upper part is installed inside the fourth groove (511).

8. A semi-circular arc linear coaxial illumination source according to claim 7, characterized in that: The light source body (10) also includes a first end plate (17) installed on one side of the upper cover plane (51) and a second end plate (18) installed on the other side of the upper cover plane (51); the first end plate (17) and the second end plate (18) are fixedly connected to the upper cover plane (51) by bolts; the inner sides of the first end plate (17) and the second end plate (18) are provided with a fifth groove (19) arranged at an inclination, and both ends of the beam splitter (7) are inserted into the fifth groove (19).

9. A semi-circular arc linear coaxial lighting source according to claim 2, characterized in that: The lower part of the sixth groove (55) is provided with a third receiving groove (512), and the lens (54) is attached to the inside of the third receiving groove (512) and is limited by the third receiving groove (512).

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