Illuminating device for PCB (printed circuit board) detection

Abstract

The invention discloses a lighting device for PCB detection, and relates to the technical field of detection light sources. The lighting device for PCB detection comprises a shell, a diffusion assembly, a first area light source part, a second area light source part, a line light source part and a coaxial light source part. The two diffusion plates are arranged in the containing cavity and obliquely located above the light outlet. The first surface light source part is obliquely positioned above the first diffusion plate; the second surface light source part is obliquely positioned above the second diffusion plate; the linear light source part is obliquely positioned above the first diffusion plate; the coaxial light source part is positioned above the two diffusion plates; the first area light source part, the second area light source part, the line light source part and the coaxial light source part can be started according to the detection requirement of the PCB to be detected, light processing is conducted on the first area light source part, the line light source part and the second area light source part through the first diffusion plate and the second diffusion plate respectively, and adaptability to different detection requirements is good; the detection process can be shortened, and the detection efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of light source technology, and in particular to an illumination device for PCB inspection. Background Technology

[0002] As electronic products move towards higher density and miniaturization, the requirements for PCB inspection are also increasing. These requirements typically include detecting high-precision appearance defects such as solder joints, scratches, and component misalignment, as well as screening for potential electrical performance defects such as cold solder joints and abnormal heating caused by short circuits. Furthermore, visual inspection of the electronic components on the PCB is also required. However, for PCBs with numerous and complex layouts containing a large number of electronic components, the size and material of each component are often different. Existing visual inspection light sources are mostly of a single type, which provides poor illumination for complex PCB layouts and easily creates shadows when illuminating electronic components. To complete comprehensive PCB inspection, multiple independent light sources and multiple camera stations are often required, resulting in a lengthy inspection process and low efficiency. Summary of the Invention

[0003] The purpose of this invention is to overcome the above-mentioned defects in the prior art and provide a lighting device for PCB inspection, which has good adaptability to different inspection requirements of PCBs to be inspected, can shorten the inspection process, and improve inspection efficiency.

[0004] To achieve the above objectives, the present invention provides an illumination device for PCB inspection. The illumination device for PCB inspection includes a housing, a diffuser assembly, a first surface light source, a second surface light source, a line light source, and a coaxial light source. The housing has a receiving cavity and a light-emitting port. The light-emitting port is located at the bottom of the housing and communicates with the receiving cavity. The diffuser assembly includes a diffuser plate and a rotating plate. The rotating plate is rotatably connected to the housing around a third axis. Two diffuser plates are provided, both connected to the rotating plate. The two diffuser plates are arranged along a second horizontal direction and are respectively the first diffuser plate and the second diffuser plate. Both diffuser plates are disposed within the receiving cavity and are inclined above the light-emitting port, with their upper parts inclined towards each other and spaced apart. The first surface light source is rotatably disposed within the receiving cavity around a first axis and is inclined above the first diffuser plate. The first light-emitting end of the first surface light source faces the first… A diffuser plate is provided; a second light source element is rotatably disposed within the receiving cavity around a second axis and is inclined above the second diffuser plate; the second light-emitting end of the second light source element faces the second diffuser plate; the distance between the second light-emitting end and the second diffuser plate is different from the distance between the first light-emitting end and the first diffuser plate; the tilt angle of the second light source element is different from the tilt angle of the first light source element; the end face size of the second light-emitting end is larger than the end face size of the first light-emitting end; a linear light source element is disposed within the receiving cavity and is inclined above the first diffuser plate; the third light-emitting end of the linear light source element faces the first diffuser plate; a coaxial light source element is disposed within the receiving cavity and is located above the two diffuser plates; the light-emitting surface of the coaxial light source element faces the two diffuser plates; wherein the axial directions of the first axis, the second axis, and the third axis are all parallel to the first horizontal direction; the first horizontal direction and the second horizontal direction are perpendicular to each other.

[0005] Furthermore, the two diffuser plates are symmetrically arranged, and the lower parts of the two diffuser plates are at least partially located above the bottom wall of the receiving cavity; the gap between the upper parts of the two diffuser plates is vertically offset from the first surface light source and the second surface light source.

[0006] Furthermore, a groove is provided on the bottom wall of the receiving cavity; there are two grooves, and they are respectively located on both sides of the light outlet along the second horizontal direction; the two grooves are respectively located below the lower part of the two diffuser plates; rotating the rotating plate can cause the lower part of one of the diffuser plates to abut against the inner wall of the groove.

[0007] Furthermore, the third light-emitting end of the linear light source is located between the first surface light source and the second surface light source; rotating the rotating plate allows the gap between the two diffuser plates to be positioned opposite to the third light-emitting end of the linear light source.

[0008] Furthermore, the coaxial light source includes a fourth connecting structure, a beam splitter, and a fourth light-emitting structure; the beam splitter is inclined toward the gap between the upper parts of the two diffuser plates; the fourth light-emitting structure is located on one side of the beam splitter and is inclined toward the beam splitter; a fourth connecting hole is provided on the side wall of the fourth light-emitting structure along the first horizontal direction, and a strip groove is provided on the side end of the outer shell along the first horizontal direction, the strip groove communicating with the receiving cavity; the strip groove extends in an inclined direction, and the fourth connecting structure is detachably inserted through the strip groove and the fourth connecting hole.

[0009] Furthermore, it also includes supplementary light sources; there are two supplementary light sources, which are located on opposite sides of the two diffuser plates along the second horizontal direction, and both supplementary light sources are oriented towards the diffuser plates.

[0010] Furthermore, it also includes a fifth connecting structure and a fifth rotating shaft; the supplementary light source is provided with a fifth connecting hole and a fifth rotating hole on its side end along the first horizontal direction; the outer shell is provided with a fifth arc-shaped groove and a fifth through hole on its side end along the first horizontal direction; the fifth connecting structure is detachably inserted through the fifth arc-shaped groove and the fifth connecting hole; the fifth rotating shaft is rotatably inserted through the fifth through hole and the fifth rotating hole.

[0011] Furthermore, the distance between the second light-emitting end and the second diffuser plate is greater than the distance between the first light-emitting end and the first diffuser plate; the tilt angle of the second surface light source is greater than the tilt angle of the first surface light source.

[0012] Furthermore, the first surface light source includes a first connecting structure, a first rotating shaft, and a first light-emitting structure; the first light-emitting structure has a first connecting hole and a first rotating hole on its sidewall along the first horizontal direction, and the outer shell has a first arc-shaped groove and a first through hole on its side end along the first horizontal direction, the first arc-shaped groove communicating with the receiving cavity; the first connecting structure is detachably inserted through the first arc-shaped groove and the first connecting hole; the first rotating shaft is rotatably inserted through the first through hole and the first rotating hole; the second surface light source includes a second connecting structure, a second rotating shaft, and a second light-emitting structure; the second light-emitting structure has a second connecting hole and a second rotating hole on its sidewall along the first horizontal direction, and the outer shell has a second arc-shaped groove and a second through hole on its side end along the first horizontal direction, the second arc-shaped groove communicating with the receiving cavity; the second connecting structure is detachably inserted through the second arc-shaped groove and the second connecting hole; the second rotating shaft is rotatably inserted through the second through hole and the second rotating hole.

[0013] Furthermore, two rotating plates are provided, and each is rotatably disposed on one of the two side walls of the receiving cavity along the first horizontal direction; the two ends of the diffuser plate are respectively connected to the two rotating plates; the rotating plates can rotate around a third axis; the third axis is offset from the first surface light source, the second surface light source, and the line light source in the vertical direction.

[0014] Compared with the prior art, the present invention has the following advantages: In the embodiments of the present invention, the PCB to be tested can be placed below the light outlet; the first light source and the second light source emit light towards the first diffuser and the second diffuser, respectively. The light passes through the diffuser to illuminate the PCB to be tested. Since the distance between the second light-emitting end of the second light source and the second diffuser is different from the distance between the first light-emitting end of the first light source and the first diffuser, and the tilt angle of the second light source is different from the tilt angle of the first light source, and the end face size of the second light-emitting end is larger than that of the first light-emitting end, asymmetrical combined diffuse light can be emitted by the asymmetrical first light source and the second light source, reducing the shadow generated on the PCB to be tested and improving the illumination effect; the first light source and the second light source can rotate around the first axis and the second axis, respectively, to adjust the angle of the emitted light, and the two diffuser plates can rotate around the third axis via rotating plates to adapt to the two first light sources and the second light source. The invention employs a design to prevent the first and second light sources from directly illuminating the PCB under test between two diffuser plates, thus ensuring effective illumination. A coaxial light source is positioned above the two diffuser plates, allowing at least a portion of its light to pass between them and directly illuminate the PCB, providing overall illumination. Since the second light-emitting end has a larger end face than the first, and the line light source is positioned above the first diffuser plate, it can emit light towards the first diffuser plate, supplementing its illumination. Alternatively, the line light source and the second light source can be used to illuminate the first and second diffuser plates respectively, adapting to different lighting requirements. This invention can activate the first, second, line, and coaxial light sources according to the testing requirements of the PCB under test. The first and second diffuser plates respectively process the light from the first and line light sources, resulting in good adaptability to different testing needs of the PCB, shortening the testing process, and improving testing efficiency. Attached Figure Description

[0015] To more clearly illustrate the technology in the embodiments of the present invention 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 the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the lighting device for PCB inspection according to the present invention;

[0017] Figure 2This is a schematic diagram of the lighting device for PCB inspection according to the present invention from another perspective;

[0018] Figure 3 This is a cross-sectional view of the lighting device for PCB inspection according to the present invention;

[0019] Figure 4 This is a schematic diagram of the structure of the first light source component of the lighting device for PCB inspection according to the present invention;

[0020] Figure 5 This is a schematic diagram of the structure of the second light source component of the lighting device for PCB inspection according to the present invention.

[0021] Reference numerals: outer shell 100; receiving cavity 101; light outlet 102; groove 103; strip groove 104; first arc groove 110; first through hole 120; second arc groove 130; second through hole 140; fifth arc groove 150; fifth through hole 160; diffuser plate 210; first diffuser plate; second diffuser plate; rotating plate 220; first surface light source 300; first light-emitting end 301; first connecting hole 310; first rotating hole 320; second surface light source 400; second light-emitting end 401; second connecting hole 410; second rotating hole 420; line light source 500; third light-emitting end 501; coaxial light source 600; light-emitting surface 601; fourth light-emitting structure 610; beam splitter 620; supplementary light source 700. Detailed Implementation

[0022] The technology of this embodiment of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiment is one embodiment of the present invention, and not all embodiments thereof. Based on this embodiment of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0024] Furthermore, if the embodiments of the present invention involve descriptions such as "first" or "second", such descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated.

[0025] Please see Figures 1 to 5An embodiment of the present invention provides an illumination device for PCB inspection. The illumination device for PCB inspection includes a housing 100, a diffuser assembly, a first surface light source 300, a second surface light source 400, a line light source 500, and a coaxial light source 600. The housing 100 is provided with a receiving cavity 101 and a light outlet 102. The light outlet 102 is located at the bottom end of the housing 100 and communicates with the receiving cavity 101. The diffuser assembly includes a diffuser plate 210 and a rotating plate 220. The rotating plate 220 is rotatably connected to the housing 100 around a third axis. The diffuser plate 210... There are two light-emitting plates 210, both connected to the rotating plate 220; the two diffuser plates 210 are arranged along the second horizontal direction, and are respectively the first diffuser plate 211 and the second diffuser plate 212; both diffuser plates 210 are disposed in the receiving cavity 101, and are inclined above the light-emitting port 102, with the upper parts of the two diffuser plates 210 inclined towards each other and spaced apart; the first light source element 300 is rotatably disposed in the receiving cavity 101 around the first axis, and is inclined above the first diffuser plate 211; the first light-emitting end 30 of the first light source element 300... The first light source 301 is oriented towards the first diffuser plate 211; the second light source 400 is rotatably disposed within the receiving cavity 101 around the second axis and is tilted above the second diffuser plate 212; the second light-emitting end 401 of the second light source 400 is oriented towards the second diffuser plate 212; the distance between the second light-emitting end 401 and the second diffuser plate 212 is different from the distance between the first light-emitting end 301 and the first diffuser plate 211; the tilt angle of the second light source 400 is different from the tilt angle of the first light source 300; the end face size of the second light-emitting end 401 is larger than that of the first diffuser plate 212. The size of the end face of the light-emitting end 301; the linear light source 500 is disposed in the receiving cavity 101 and is inclined above the first diffuser plate 211; the third light-emitting end 501 of the linear light source 500 is disposed facing the first diffuser plate 211; the coaxial light source 600 is disposed in the receiving cavity 101 and is located above the two diffuser plates 210; the light-emitting surface 601 of the coaxial light source 600 is disposed facing the two diffuser plates 210; wherein, the axial directions of the first axis, the second axis and the third axis are all parallel to the first horizontal direction; the first horizontal direction and the second horizontal direction are perpendicular to each other.

[0026] In this embodiment of the invention, the PCB to be tested can be placed below the light outlet 102; the first light source 300 and the second light source 400 emit light towards the first diffuser plate 211 and the second diffuser plate 212 respectively, and the light passes through the diffuser plate 210 to illuminate the PCB to be tested. Since the distance between the second light-emitting end 401 of the second light source 400 and the second diffuser plate 212 is different from the distance between the first light-emitting end 301 of the first light source 300 and the first diffuser plate 211, the tilt angle of the second light source 400 is different from the tilt angle of the first light source 300. The end face size of the second light-emitting end 401 is larger than that of the first light-emitting end 301, so that asymmetrical combined diffused light can be emitted from the asymmetrical first light source 300 and the second light source, reducing shadows on the PCB under test and improving the lighting effect. The first light source and the second light source can rotate around the first axis and the second axis respectively to adjust the angle of the emitted light. The two diffuser plates 210 can rotate around the third axis via the rotating plate 220 to adapt to the two first light source and the second light source, preventing the first light source and the second light source from emitting light from the two diffuser plates. The light from the two diffuser plates 210 directly illuminates the PCB under test, ensuring effective illumination. The coaxial light source 600 is positioned above the two diffuser plates 210, allowing at least a portion of the light emitted from the coaxial light source 600 to pass between the two diffuser plates 210 and directly illuminate the PCB under test, providing overall illumination. Since the end face size of the second light-emitting end 401 is larger than that of the first light-emitting end 301, and the line light source 500 is positioned above the first diffuser plate 211, the line light source 500 can emit light towards the first diffuser plate 211 to supplement its illumination. Of course... Alternatively, the first diffuser plate 211 and the second diffuser plate 212 can be illuminated by the line light source 500 and the second surface light source 400 respectively to adapt to different lighting requirements. The present invention can activate the first surface light source 300, the second surface light source, the line light source 500 and the coaxial light source 600 according to the detection requirements of the PCB to be tested. The first diffuser plate 211 and the second diffuser plate 212 respectively process the light of the first surface light source 300, the line light source 500 and the second surface light source. It has good adaptability to different detection requirements of the PCB to be tested, can shorten the detection process and improve detection efficiency.

[0027] Specifically, the first light-emitting structure of the first light source 300 and the second light-emitting structure of the second light source 400 are both infrared LEDs integrated with white light. By introducing a specific wavelength, such as 940nm, this invention achieves seamless coordination between visible light detection and infrared excitation / transparent detection. It can provide ideal illumination for infrared thermal imagers while performing visible light appearance inspection or alternately, assisting in monitoring the heat distribution of components after power-on, and completing the screening of appearance and potential electrical performance defects in one go, greatly simplifying the testing process and equipment architecture. Furthermore, since some dark or semi-transparent materials, such as the plastic shell 100 and silicone, are transparent to infrared light, the first light source 300 and the second light source 400 can detect internal structures or markings, and have good adaptability to different electronic components.

[0028] Specifically, the double-sided inclined diffuser plate 210, combined with the bottom supplementary light source 700, forms a highly efficient and uniform diffuser cavity, which can eliminate stray reflections and hard shadows. It is particularly suitable for uniform imaging of curved and multi-textured components, and can better detect uneven components or BGA solder balls.

[0029] Specifically, the length directions of the first light source 300, the second light source 400, the line light source 500, the coaxial light source 600, the supplementary light source 700, the light outlet 102, and the diffuser plate 210 are all in the first horizontal direction.

[0030] Reference Figure 2 and Figure 3 In some embodiments of the present invention, two diffuser plates 210 are symmetrically arranged, and the lower part of the two diffuser plates 210 is at least partially located above the bottom wall of the receiving cavity 101; the gap between the upper parts of the two diffuser plates 210 is vertically offset from the first surface light source 300 and the second surface light source 400.

[0031] The two inclined diffuser plates 210 can be symmetrically arranged with respect to the vertical plane to improve the uniformity of light passing through the two diffuser plates 210 onto the PCB to be tested; and after rotation, the two diffuser plates 210 remain symmetrically arranged.

[0032] The lower portions of the two diffuser plates 210 are at least partially located above the bottom wall of the receiving cavity 101, so as to prevent light in the receiving cavity 101 from passing between the lower portions of the diffuser plates 210 and the bottom wall of the receiving cavity 101, thereby improving the stability of light processing.

[0033] The gap between the upper parts of the two diffuser plates 210 is vertically offset from the first light source 300 and the second light source 400 to prevent the light emitted from the first light source 300 and the second light source 400 from directly shining on the PCB to be tested.

[0034] Reference Figure 3 In some embodiments of the present invention, a groove 103 is provided on the bottom wall of the receiving cavity 101; two grooves 103 are provided and are respectively located on both sides of the light outlet 102 along the second horizontal direction; the two grooves 103 are respectively located below the lower part of the two diffuser plates 210; rotating the rotating plate 220 can cause the lower part of one of the diffuser plates 210 to abut against the inner wall of the groove 103.

[0035] By setting the groove 103, the degree of rotation of the light-blocking plate within the receiving cavity 101 can be increased; after rotating the rotating plate 220 to a predetermined angle, the lower part of one of the rotating plates 220 abuts against the inner wall of the groove 103, so as to further prevent the light in the receiving cavity 101 from passing between the lower part of the diffuser plate 210 and the bottom wall of the receiving cavity 101, thereby improving the stability of light processing.

[0036] Specifically, the diffuser plate 210, the light outlet 102, and the groove 103 are all arranged to extend along the first horizontal direction.

[0037] Reference Figure 3 In some embodiments of the present invention, the third light-emitting end 501 of the linear light source 500 is located between the first surface light source 300 and the second surface light source 400; rotating the rotating plate 220 can make the gap between the two diffuser plates 210 be positioned opposite to the third light-emitting end 501 of the linear light source 500.

[0038] Specifically, the angle between the light-emitting direction of the third light-emitting end 501 of the linear light source 500 and the horizontal direction is greater than the angle between the light-emitting direction of the second light-emitting end 401 of the second surface light source 400 and the horizontal direction, so that the linear light source 500 can emit light from a higher angle.

[0039] After the rotating plate 220 is rotated to the predetermined position, the third light-emitting end 501 of the line light source 500 can face the gap between the two diffuser plates 210, so that the line light source 500 can directly illuminate the PCB to be tested from the gap between the two diffuser plates 210.

[0040] Reference Figures 1 to 3In some embodiments of the present invention, the coaxial light source 600 includes a fourth connecting structure, a beam splitter 620, and a fourth light-emitting structure 610; the beam splitter 620 is inclined toward the gap between the upper parts of the two diffuser plates 210; the fourth light-emitting structure 610 is located on one side of the beam splitter 620 and is inclined; the fourth light-emitting structure 610 is disposed toward the beam splitter 620; a fourth connecting hole is provided on the side wall of the fourth light-emitting structure 610 along the first horizontal direction; a strip groove 104 is provided on the side end of the housing 100 along the first horizontal direction, and the strip groove 104 is connected to the receiving cavity 101; the strip groove 104 extends in an inclined direction, and the fourth connecting structure is detachably disposed through the strip groove 104 and the fourth connecting hole.

[0041] After the light emitted from the fourth light-emitting structure 610 shines on the beam splitter 620, the light is reflected by the beam splitter 620 and emitted outward from the gap between the upper parts of the two diffuser plates 210. The tilted fourth light-emitting structure 610 can illuminate the soldering position between the component and the PCB under test from the tilted direction.

[0042] Specifically, the fourth light-emitting structure 610 can move toward or away from the beam splitter 620. After the fourth light-emitting structure 610 is moved to a predetermined position, it can be fixed in position within the receiving cavity 101 by passing through the strip groove 104 and the fourth connecting hole via the fourth connecting structure.

[0043] Specifically, the fourth connecting structure can be a bolted connection structure, and the fourth connecting hole is a threaded hole, so that the fourth light-emitting structure 610 can rotate relative to the first horizontal direction.

[0044] Specifically, the inclination direction of the strip groove 104 is an angled direction relative to the horizontal direction.

[0045] Reference Figure 3 In some embodiments of the present invention, a supplementary light source 700 is also included; two supplementary light source 700s are provided and are respectively located on two sides of the two diffuser plates 210 that are far apart from each other along the second horizontal direction, and the supplementary light source 700s are both arranged facing the diffuser plate 210.

[0046] By setting up supplementary light sources, the diffuser plate 210 can be illuminated separately, thereby providing supplementary lighting for the diffuser plate 210 and increasing the brightness of the light emitted by the diffuser plate 210.

[0047] Specifically, the supplementary light source 700 is at the same height as the diffuser plate 210 in the horizontal direction.

[0048] Specifically, the supplementary light source 700 can be a lamp holder with an LED light panel structure.

[0049] Reference Figures 1 to 3 In some embodiments of the present invention, a fifth connecting structure and a fifth rotating shaft are also included; a fifth connecting hole and a fifth rotating hole are provided on the side end of the supplementary light source 700 along the first horizontal direction; a fifth arc-shaped groove 150 and a fifth through hole 160 are provided on the side end of the housing 100 along the first horizontal direction; the fifth connecting structure is detachably inserted through the fifth arc-shaped groove 150 and the fifth connecting hole; and the fifth rotating shaft is rotatably inserted through the fifth through hole 160 and the fifth rotating hole.

[0050] By setting a fifth rotating shaft, the supplementary light source 700 can be rotated to cooperate with the diffuser plate 210 to improve the adaptability of the supplementary light; and after rotating to a predetermined position, the fifth connecting structure passes through the fifth arc-shaped groove 150 and the fifth connecting hole to fix the position of the supplementary light source 700.

[0051] Specifically, the length direction of the fifth rotating shaft is set parallel to the horizontal direction of the first horizontal axis.

[0052] Reference Figure 3 In some embodiments of the present invention, the distance between the second light-emitting end 401 and the second diffuser plate 212 is greater than the distance between the first light-emitting end 301 and the first diffuser plate 211, and the tilt angle of the second surface light source 400 is greater than the tilt angle of the first surface light source 300, so as to generate asymmetrical combined diffused light and reduce the shadow generated on the PCB to be tested.

[0053] Specifically, the angle between the light-emitting direction of the second light-emitting end 401 of the second light source 400 and the horizontal direction is greater than the angle between the light-emitting direction of the first light-emitting end 301 of the first light source 300 and the horizontal direction.

[0054] Reference Figure 1 , Figure 3 , Figure 4 and Figure 5 In some embodiments of the present invention, the first surface light source 300 includes a first connecting structure, a first rotating shaft, and a first light-emitting structure; the first light-emitting structure is provided with a first connecting hole 310 and a first rotating hole 320 on its side wall along the first horizontal direction, and the outer shell 100 is provided with a first arc-shaped groove 110 and a first through hole 120 at its side end along the first horizontal direction, the first arc-shaped groove 110 being connected to the receiving cavity 101; the first connecting structure is detachably inserted through the first arc-shaped groove 110 and the first connecting hole 310; the first rotating shaft is rotatably inserted through the first through hole 120 and the first rotating hole 320; the first light-emitting structure can be rotated through the first rotating shaft to adjust the light emission position of the first light-emitting structure, and after the first light-emitting structure rotates to a predetermined position, the first connecting structure passes through the first arc-shaped groove 110 and the first connecting hole 310 to fix the position of the first light-emitting structure in the receiving cavity 101.

[0055] Specifically, the length direction of the first rotating shaft is set in the same direction as the axial direction of the first axis.

[0056] The second light source component 400 includes a second connecting structure, a second rotating shaft, and a second light-emitting structure. The second light-emitting structure has a second connecting hole 410 and a second rotating hole 420 on its side wall along the first horizontal direction. The outer shell 100 has a second arc-shaped groove 130 and a second through hole 140 on its side end along the first horizontal direction. The second arc-shaped groove 130 is connected to the receiving cavity 101. The second connecting structure is detachably inserted through the second arc-shaped groove 130 and the second connecting hole 410. The second rotating shaft is rotatably inserted through the second through hole 140 and the second rotating hole 420.

[0057] The second light-emitting structure can be rotated via the second rotating shaft to adjust the light-emitting position of the second light-emitting structure. After the second light-emitting structure is rotated to the predetermined position, the second connecting structure passes through the second arc-shaped groove 130 and the second connecting hole 410 to fix the position of the second light-emitting structure in the receiving cavity 101.

[0058] Specifically, the length direction of the second rotating shaft is set in the same direction as the axial direction of the second axis.

[0059] Specifically, the first and second connecting structures can be bolted connections, and the first connecting hole 310 and the second connecting hole 410 are threaded holes, so that the fourth light-emitting structure 610 can rotate relative to the first horizontal direction.

[0060] Specifically, the first light-emitting structure and the second light-emitting structure can be lamp holder structures with LED light panels.

[0061] Reference Figure 3 In some embodiments of the present invention, two rotating plates 220 are provided, and are rotatably disposed on the two side walls of the receiving cavity 101 along the first horizontal direction respectively; the two ends of the diffuser plate 210 are respectively connected to the two rotating plates 220; the rotating plates 220 can rotate around a third axis; the third axis is disposed vertically in a way that avoids the first surface light source 300, the second surface light source 400 and the line light source 500.

[0062] Specifically, the light-emitting port 102 is provided through the first horizontal direction, and a groove 103 is provided on the inner wall of the receiving cavity 101 along the first horizontal direction. The light-emitting port 102 is connected to the bottom of the groove 103. The top wall surface of the groove 103 is arc-shaped, and the top of the rotating plate 220 is also arc-shaped, so that the rotating plate 220 can rotate around the groove 103. Multiple first connecting through holes and second connecting through holes are provided on the side wall of the groove 103 and the rotating plate 220, respectively. After rotating the rotating plate 220, the second connecting through holes can be arranged opposite to different first connecting through holes. The position between the rotating plate 220 and the outer shell 100 is fixed by a bolt connection structure passing through the first connecting through holes and the second connecting through holes.

[0063] Specifically, a plurality of first connecting through holes are provided on the inner wall of the groove 103 along the arc direction, and a plurality of second connecting through holes are provided on the rotating plate 220 along the arc direction. After the rotating plate 220 is rotated to a predetermined position, at least one first connecting through hole and one second connecting through hole are staggered.

[0064] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An illumination device for PCB inspection, characterized in that, include: The outer casing has a receiving cavity and a light-emitting port; the light-emitting port is located at the bottom end of the outer casing and is connected to the receiving cavity. A diffuser assembly includes a diffuser plate and a rotating plate; the rotating plate is rotatably connected to the housing around a third axis; two diffuser plates are provided, both connected to the rotating plate; the two diffuser plates are arranged along a second horizontal direction and are respectively a first diffuser plate and a second diffuser plate; both diffuser plates are disposed within the receiving cavity and are inclined above the light outlet, with the upper parts of the two diffuser plates inclined towards each other and spaced apart; A first light source element is rotatably disposed within the receiving cavity around a first axis and is tilted above the first diffuser plate; the first light-emitting end of the first light source element is disposed facing the first diffuser plate. A second light source is rotatably disposed within the receiving cavity around a second axis and is tilted above the second diffuser plate; the second light-emitting end of the second light source faces the second diffuser plate; the distance between the second light-emitting end and the second diffuser plate is different from the distance between the first light-emitting end and the first diffuser plate; the tilt angle of the second light source is different from the tilt angle of the first light source; the end face size of the second light-emitting end is larger than the end face size of the first light-emitting end. A linear light source is disposed within the receiving cavity and is tilted above the first diffuser plate; the third light-emitting end of the linear light source is disposed facing the first diffuser plate. A coaxial light source is disposed within the receiving cavity and located above the two diffuser plates; the light-emitting surface of the coaxial light source faces the two diffuser plates. The axes of the first, second, and third axes are all parallel to the first horizontal direction; the first horizontal direction is perpendicular to the second horizontal direction.

2. The lighting device for PCB inspection according to claim 1, characterized in that, The two diffuser plates are symmetrically arranged, and the lower part of the two diffuser plates is at least partially located above the bottom wall of the receiving cavity; the gap between the upper parts of the two diffuser plates is vertically offset from the first surface light source and the second surface light source.

3. The lighting device for PCB inspection according to claim 2, characterized in that, The bottom wall of the receiving cavity is provided with a groove; there are two grooves, and they are respectively located on both sides of the light outlet along the second horizontal direction; the two grooves are respectively located below the lower part of the two diffuser plates; rotating the rotating plate can cause the lower part of one of the diffuser plates to abut against the inner wall of the groove.

4. The lighting device for PCB inspection according to claim 1, characterized in that, The third light-emitting end of the linear light source is located between the first surface light source and the second surface light source; rotating the rotating plate can make the gap between the two diffuser plates opposite to the third light-emitting end of the linear light source.

5. The lighting device for PCB inspection according to claim 1, characterized in that, The coaxial light source includes a fourth connecting structure, a beam splitter, and a fourth light-emitting structure; the beam splitter is tilted toward the gap between the upper parts of the two diffuser plates; the fourth light-emitting structure is located on one side of the beam splitter and tilted toward the beam splitter; a fourth connecting hole is provided on the side wall of the fourth light-emitting structure along the first horizontal direction; a strip groove is provided on the side end of the outer shell along the first horizontal direction, and the strip groove is connected to the receiving cavity; the strip groove extends along the inclined direction, and the fourth connecting structure is detachably inserted through the strip groove and the fourth connecting hole.

6. The lighting device for PCB inspection according to claim 1, characterized in that, It also includes supplementary light sources; there are two supplementary light sources, which are located on opposite sides of the two diffuser plates along the second horizontal direction, and both supplementary light sources are oriented toward the diffuser plates.

7. The lighting device for PCB inspection according to claim 6, characterized in that, It also includes a fifth connecting structure and a fifth rotating shaft; the supplementary light source is provided with a fifth connecting hole and a fifth rotating hole on its side end along the first horizontal direction; the outer shell is provided with a fifth arc-shaped groove and a fifth through hole on its side end along the first horizontal direction; the fifth connecting structure is detachably inserted through the fifth arc-shaped groove and the fifth connecting hole; the fifth rotating shaft is rotatably inserted through the fifth through hole and the fifth rotating hole.

8. The lighting device for PCB inspection according to claim 1, characterized in that, The distance between the second light-emitting end and the second diffuser plate is greater than the distance between the first light-emitting end and the first diffuser plate; the tilt angle of the second surface light source is greater than the tilt angle of the first surface light source.

9. The lighting device for PCB inspection according to claim 1, characterized in that, The first surface light source includes a first connecting structure, a first rotating shaft, and a first light-emitting structure. The first light-emitting structure has a first connecting hole and a first rotating hole on its sidewall along a first horizontal direction. The outer shell has a first arc-shaped groove and a first through hole on its side end along the first horizontal direction, and the first arc-shaped groove communicates with the receiving cavity. The first connecting structure is detachably inserted through the first arc-shaped groove and the first connecting hole. The first rotating shaft is rotatably inserted through the first through hole and the first rotating hole. The second surface light source includes a second connecting structure, a second rotating shaft, and a second light-emitting structure. The second light-emitting structure has a second connecting hole and a second rotating hole on its sidewall along a first horizontal direction. The outer shell has a second arc-shaped groove and a second through hole on its side end along the first horizontal direction, and the second arc-shaped groove communicates with the receiving cavity. The second connecting structure is detachably inserted through the second arc-shaped groove and the second connecting hole. The second rotating shaft is rotatably inserted through the second through hole and the second rotating hole.

10. The lighting device for PCB inspection according to claim 1, characterized in that, Two rotating plates are provided, and each is rotatably disposed on one of the two side walls of the receiving cavity along the first horizontal direction; the two ends of the diffuser plate are respectively connected to the two rotating plates; the rotating plates can rotate around a third axis; the third axis is offset from the first surface light source, the second surface light source and the line light source in the vertical direction.

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