Automatic detection device for uniformity of line light source

Abstract

The invention discloses an automatic detection device for uniformity of a line light source, which comprises a placing plate, a plurality of supporting rods are arranged on the placing plate, a standard reflecting plate is arranged at the upper ends of the supporting rods, and the placing plate is in transmission connection with a transverse driving part; the transverse driving piece drives the standard reflecting plate to do transverse linear reciprocating motion; a detection camera is arranged at the upper part of the standard reflecting plate and is used for photographing the standard reflecting plate; the upper part or the lower part of the standard reflecting plate is provided with a line light source to be detected, the line light source to be detected emits light rays outwards to irradiate the standard reflecting plate, and the reflected or refracted light rays are collected by the detection camera; the standard reflecting plate is transversely driven by the transverse driving part, the detection camera photographs the whole standard reflecting plate in a segmented manner, and the irradiation uniformity of the line light source to be detected is determined according to the gray uniformity of an acquired image; the invention provides an automatic detection device which is suitable for a production line and can rapidly detect the uniformity of a line light source.

Description

Technical Field

[0001] This invention relates to the field of line light source technology, and in particular to an automatic detection device for the uniformity of a line light source. Background Technology

[0002] With the gradual development of industrial automation and artificial intelligence, machine vision is playing an increasingly important role, and uniform illumination of the light source plays a crucial role in machine vision inspection. In a machine vision system, the object being measured is imaged on the camera through a lens. The detection accuracy of the system is closely related to the image quality, and the illumination of the object directly affects the image quality. Therefore, major machine vision manufacturers currently regard uniformity as one of the core indicators for evaluating the performance of the light source.

[0003] In machine vision systems, a stable and uniform light source is a prerequisite for obtaining high-quality, repeatable images. For line light sources, the uniformity of their elongated luminous surface is crucial, directly affecting the brightness consistency of each line of images captured by the line scan camera. Currently, commonly used techniques generally involve manual inspection, with manual sampling using illuminance meters to manually measure and record data after the light source is illuminated. This method often has significant errors due to individual differences. Another approach is to use a color luminance meter, which can directly measure the brightness distribution of the light source, providing absolute brightness values ​​(units: nits or cd / m²). It can capture the two-dimensional brightness distribution of the entire light source in one go, and then analyze the uniformity through software. This method has high accuracy, but the equipment is expensive and is usually used in laboratory environments, where cost and environment are very limited, and the detection efficiency is not high, often used in high-end optical laboratories. Therefore, there is a need to design an automated detection device suitable for production lines that can quickly detect the uniformity of line light sources. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of existing technologies, such as large errors in manual sampling and high costs in precise detection, and to provide an automatic detection device suitable for production lines that can quickly detect the uniformity of line light sources.

[0005] To achieve the above objectives, the present invention provides an automatic detection device for the uniformity of a line light source, comprising a placement plate, on which a plurality of support rods are mounted, and a standard reflector is mounted on the upper end of each support rod. The placement plate is connected to a transverse drive component; the transverse drive component drives the standard reflector to reciprocate in a transverse linear motion; a detection camera is mounted on the upper part of the standard reflector, and the detection camera takes pictures of the standard reflector; a line light source to be detected is mounted on the upper or lower part of the standard reflector, and the line light source emits light outward to illuminate the standard reflector, and the reflected or refracted light is collected by the detection camera; under the transverse drive of the transverse drive component, the detection camera takes pictures of the entire standard reflector in segments, and the illumination uniformity of the line light source to be detected is determined based on the grayscale uniformity of the acquired images.

[0006] Preferably, a first standard line light source is installed on one side of the upper part of the standard reflector, and a second standard line light source is installed on the other side; both the first and second standard line light sources illuminate the standard reflector at an angle from above, and a line light source to be tested is installed at the lower part of the standard reflector; the line light source to be tested illuminates the standard reflector from below, and the light emitted by the first and second standard line light sources is reflected by the standard reflector and collected by the detection camera; the light emitted by the line light source to be tested is refracted by the standard reflector and also collected by the detection camera.

[0007] Preferably, the lower part of the transverse drive component is equipped with a frame plate, and a first gantry and a second gantry are movably connected to the frame plate. The first gantry and the second gantry are arranged vertically side by side. A first light source connecting frame is installed on the first gantry, and a first standard line light source is installed on the first light source connecting frame. A second light source connecting frame is installed on the second gantry, and a second standard line light source is installed on the second light source connecting frame.

[0008] Preferably, a third gantry is installed between the first gantry and the second gantry. The third gantry is mounted on the frame plate and a detection camera is mounted on the third gantry. The third gantry drives the detection camera to move longitudinally and vertically to take segmented pictures of the entire standard reflector.

[0009] Preferably, a third light source connecting frame is installed between the first gantry and the third gantry. The third light source connecting frame is movably connected to the frame plate, and the light source to be tested is installed on the third light source connecting frame. The third light source connecting frame includes a first vertical rod installed on both sides of the frame plate, a second U-shaped block installed between the two first vertical rods, and the light source to be tested installed on the second U-shaped block. The second U-shaped block and the first vertical rod are fixedly connected by a fourth locking screw. The first vertical rod is provided with a plurality of vertically arranged vertical mounting holes. The second U-shaped block is provided with a plurality of first longitudinal U-shaped grooves, which are used to adjust the longitudinal position of the light source to be tested.

[0010] Preferably, the frame plate is equipped with transverse guide rails on both sides, and a first gantry frame, a second gantry frame, and a third light source connecting frame are mounted on the transverse guide rails. The lower parts of the first gantry frame, the second gantry frame, and the third light source connecting frame are movably connected to the transverse guide rails via transverse sliders. The lower parts of the first gantry frame, the second gantry frame, and the third light source connecting frame move laterally back and forth along the transverse guide rails via the transverse sliders. The transverse sliders are also equipped with a first locking screw for locking the transverse position of the transverse sliders.

[0011] Preferably, the lateral drive component is mounted on the frame plate, and the lateral drive component is a lateral drive module. The lateral drive module drives the standard reflector to move in a lateral linear reciprocating motion. There are four support rods, and the upper part is provided with a receiving groove. The receiving groove is used to place the standard reflector, and the line light source to be tested is arranged between the support rods.

[0012] Preferably, both the first and second gantry frames include a first inverted U-shaped frame, drive rollers on both sides of the first inverted U-shaped frame, and support rollers on the top. An annular belt is fitted onto the drive rollers and support rollers. Two vertical sliding blocks are provided on the annular belt; one vertical sliding block is fixed to the outside of the annular belt, and the other vertical sliding block is fixed to the inside of the annular belt. A vertical guide rail is provided inside the first inverted U-shaped frame, and the vertical sliding blocks reciprocate vertically along the vertical guide rail. A first drive handwheel is installed on one side of one of the drive rollers, driving the annular belt to rotate, thereby causing the vertical sliding blocks to reciprocate vertically along the vertical guide rail. A second locking screw for locking the vertical position of the vertical sliding block is also installed on one of the vertical sliding blocks. A first light source connecting frame is installed on the vertical sliding block of the first gantry frame, and a second light source connecting frame is installed on the vertical sliding block of the second gantry frame.

[0013] Preferably, both the first light source connecting frame and the second light source connecting frame include a first horizontal rod mounted on a vertical sliding block, a first U-shaped block mounted between the two first horizontal rods, and a first standard line light source or a second standard line light source mounted on the first U-shaped block; the first U-shaped block and the first horizontal rod are fixedly connected by a third locking screw, and the first horizontal rod is provided with a plurality of horizontally arranged horizontal mounting holes; the first U-shaped block is provided with a plurality of first longitudinal U-shaped grooves, which are used to adjust the longitudinal position of the first standard line light source or the second standard line light source.

[0014] Preferably, the third gantry includes a second inverted U-shaped frame and ball screws mounted on both sides of the second inverted U-shaped frame. Vertical sliders are mounted on the ball screws, and a longitudinal plate is mounted between the two vertical sliders. The longitudinal plate is mounted inside the second inverted U-shaped frame, and the ends of the two ball screws are connected by a synchronous belt drive. The longitudinal plate reciprocates vertically along the ball screws. A second drive handwheel is mounted on one side of one of the ball screws, and the second drive handwheel is connected to the ball screw via a universal joint drive. The second drive handwheel drives the ball screw to rotate. This drives the longitudinal plate to reciprocate vertically; a fifth locking screw for locking the second drive handwheel is also installed on one side; a first longitudinal guide rail is installed on the longitudinal plate, a longitudinal slider is sleeved on the first longitudinal guide rail, and a third U-shaped block is installed on the longitudinal slider; a detection camera is installed inside the third U-shaped block, a clamping plate is installed on one side of the detection camera, a clamping screw is driven to one side of the clamping plate, and the clamping screw is threaded to one side of the third U-shaped block. Rotating the clamping screw drives the clamping plate to clamp the detection camera.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0016] 1. In this invention, the line light source to be tested is placed on the upper or lower part of a standard reflector plate. The line light source to be tested emits light outward to illuminate the standard reflector plate, and the reflected or refracted light is collected by a detection camera. Furthermore, under the lateral drive of the lateral drive component, the detection camera takes pictures of the entire standard reflector plate in segments, and determines the illumination uniformity of the line light source to be tested based on the grayscale uniformity of the acquired images.

[0017] 2. The present invention can remove the line light source to be tested from the production line and install it directly on the lower part of the standard reflector. Together with the first standard line light source and the second standard line light source, and under the lateral drive of the lateral drive component, the detection camera takes pictures of the entire standard reflector in segments, and quickly detects the illumination uniformity of the line light source to be tested based on the grayscale uniformity of the acquired images. Attached Figure Description

[0018] To more clearly illustrate the technical solutions 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.

[0019] Figure 1 This is a schematic diagram of the structure of an automatic detection device for the uniformity of a line light source provided by the present invention;

[0020] Figure 2 This is a schematic diagram of the bottom structure of an automatic detection device for the uniformity of a line light source provided by the present invention;

[0021] Figure 3 This is an exploded view of the support rod and standard reflector provided by the present invention;

[0022] Figure 4 This is a schematic diagram of the structure of the first gantry frame provided by the present invention;

[0023] Figure 5 This is a schematic diagram of the structure of the first light source connecting frame provided by the present invention;

[0024] Figure 6 This is a schematic diagram of the structure of the third light source connecting frame provided by the present invention;

[0025] Figure 7 This is a schematic diagram of the structure of the lateral drive module provided by the present invention;

[0026] Figure 8 This is a schematic diagram of the structure of the second light source connecting frame provided by the present invention;

[0027] Figure 9 This is a schematic diagram of the structure of the third gantry frame provided by the present invention;

[0028] Figure 10 yes Figure 9 Enlarged diagram of point A in the middle.

[0029] The diagram includes:

[0030] 1. Placement plate; 11. Support rod; 2. Standard reflector; 3. Lateral drive component; 4. Detection camera; 5. Line light source to be tested; 61. First standard line light source; 62. Second standard line light source; 12. Frame plate; 611. First gantry frame; 621. Second gantry frame; 612. First light source connecting frame; 622. Second light source connecting frame; 631. Third gantry frame; 64. Third light source connecting frame; 86. First vertical rod; 87. Second U-shaped block; 88. Fourth locking screw; 89. Vertical mounting hole; 85. First longitudinal U-shaped groove; 14. Lateral guide rail; 65. Lateral slider; 66. First locking screw; 111. Receiving recess 78. Groove; 71. First inverted U-shaped frame; 72. Drive roller; 73. Support roller; 74. Annular belt; 75. Vertical sliding block; 76. Vertical guide rail; 77. First drive handwheel; 78. Second locking screw; 89. First transverse rod; 80. First U-shaped block; 81. Third locking screw; 82. Transverse mounting hole; 93. Second inverted U-shaped frame; 94. Ball screw; 95. Vertical slider; 96. Longitudinal plate; 97. Synchronous belt; 98. Second drive handwheel; 99. Universal joint; 90. Fifth locking screw; 91. First longitudinal guide rail; 91. Longitudinal slider; 92. Third U-shaped block; 43. Clamping plate; 44. Clamping screw. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. 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.

[0032] Please refer to Figures 1 to 10 The present invention provides an automatic detection device for the uniformity of a line light source.

[0033] like Figure 1 As shown, the automatic detection device includes a frame plate 12 at the bottom, with adjustable support legs 15 and movable rollers 16 mounted on the lower part of the frame plate 12. The adjustable support legs 15 can adjust the vertical height of the automatic detection device, and the movable rollers 16 can drive the automatic detection device to move, thereby facilitating position adjustment. A horizontal drive member 3 is mounted on the frame plate 12, and a placement plate 1 is mounted on the horizontal drive member 3. The horizontal drive member 3 is connected to the placement plate 1 and drives the placement plate 1 to move laterally reciprocally. Furthermore, four support rods 11 are mounted on the placement plate 1, and a standard reflector 2 is mounted on the upper end of the support rods 11, so that the horizontal drive member 3 can drive the standard reflector 2 to move laterally in a straight line.

[0034] In this embodiment, in order to collect light, a detection camera 4 is installed on the upper part of the standard reflector 2. The detection camera 4 takes pictures of the standard reflector 2, thereby collecting the light on the surface of the standard reflector 2. The line light source 5 to be tested can be set on the upper or lower part of the standard reflector 2. At the same time, the line light source 5 to be tested emits light outward to illuminate the standard reflector 2, and the reflected or refracted light is collected by the detection camera 4.

[0035] Furthermore, the viewing angle of the aforementioned detection camera 4 is always fixed, and it can only observe a portion of the standard reflector 2. If it is necessary to observe the entire standard reflector 2, the detection camera 4 would be more expensive, and the automatic detection device would also be larger. In this embodiment, in order to reduce costs and size, the detection camera 4 takes pictures of the entire standard reflector 2 in segments under the lateral drive of the lateral drive member 3. This allows the light from the entire standard reflector 2 to be collected at a lower cost, and the illumination uniformity of the line light source 5 to be detected can be determined based on the grayscale uniformity of the collected images.

[0036] In this embodiment, a standard line light source and the line light source 5 to be tested are set to work together to provide sufficient light for the detection camera 4 to collect light. The reference light emitted by the standard line light source and the measured light of the line light source 5 to be tested are superimposed on the standard reflector 2 to form an image. The detection camera 4 captures grayscale data, and the image processing module compares the distribution difference between the two in real time, and automatically outputs the uniformity deviation curve and the pass / fail judgment result.

[0037] In this embodiment, the standard line light source and the line light source to be tested 5 have three selectable placement positions, two of which are on the upper part of the standard reflector 2 and one is on the lower part; the three positions correspond to different installation scenarios—the upper left, the upper right, and the lower center; the line light source to be tested 5 can be installed in any position according to actual installation requirements, and the standard line light source will automatically match to the other two empty positions to ensure that the reference light and the measured light form a stable interference area on the reflector surface; furthermore, the positions of both the standard line light source and the line light source to be tested 5 can be adjusted.

[0038] like Figure 2 As shown, a first standard line light source 61 is installed on one side of the upper part of the standard reflector 2, and a second standard line light source 62 is installed on the other side. The first standard line light source 61 and the second standard line light source 62 both illuminate the standard reflector 2 from the upper part at an angle. The angle between their optical axes is generally 120°. It can also be finely adjusted in the range of 100° to 140° according to actual optical requirements to optimize the contrast of interference fringes. The two reference beams form highly stable alternating bright and dark fringes in the intersecting area on the surface of the standard reflector 2, providing a rigid reference benchmark for the uniformity evaluation of the line light source 5 to be tested.

[0039] Furthermore, a line light source 5 to be tested is installed at the lower part of the standard reflector 2; the line light source 5 to be tested illuminates the standard reflector 2 from below, and the line light source 5 to be tested is positioned between the first standard line light source 61 and the second standard line light source 62, so that the three beams of light form a stable superposition area on the standard reflector 2; the light emitted by the first standard line light source 61 and the second standard line light source 62 is reflected by the standard reflector 2 and collected by the detection camera 4; the light emitted by the line light source 5 to be tested is refracted by the standard reflector 2 and also collected by the detection camera 4.

[0040] For mounting the first standard line light source 61 and the second standard line light source 62, a first gantry 611 and a second gantry 621 are movably connected to the frame plate 12. The first gantry 611 and the second gantry 621 are arranged vertically side by side. The first gantry 611 is mounted at the front of the frame plate 12, and the second gantry 621 is mounted at the rear of the frame plate 12. A first light source connecting frame 612 is mounted on the first gantry 611, and the first standard line light source 61 is mounted on the first light source connecting frame 612. A second light source connecting frame 622 is mounted on the second gantry 621, and the second standard line light source 62 is mounted on the second light source connecting frame 622.

[0041] To install the inspection camera 4, a third gantry 631 is installed between the first gantry 611 and the second gantry 621. The third gantry 631 is mounted on the frame plate 12, and the inspection camera 4 is mounted on the third gantry 631. The inspection camera 4 moves longitudinally and vertically inside the third gantry 631 to take segmented pictures of the entire standard reflector 2, which can also adapt to more inspection needs and different standard reflectors 2.

[0042] To install the line light source 5 to be tested, a third light source connecting frame 64 is installed between the first gantry 611 and the third gantry 631. The third light source connecting frame 64 is movably connected to the frame plate 12, and the line light source 5 to be tested is installed on the third light source connecting frame 64. In this embodiment, the line light source 5 to be tested can be vertically adjusted, finely adjusted longitudinally, and adjusted for pitch angle through the third light source connecting frame 64.

[0043] like Figure 4As shown, two transverse guide rails 14 are installed on both sides of the frame plate 12, located on the left and right edges of the frame plate 12 respectively. A first gantry 611, a second gantry 621, and a third light source connecting frame 64 are installed on the transverse guide rails 14. The lower parts of the first gantry 611, the second gantry 621, and the third light source connecting frame 64 are movably connected to the transverse guide rails 14 via transverse sliders 65. The lower parts of the first gantry 611, the second gantry 621, and the third light source connecting frame 64 move laterally back and forth along the transverse guide rails 14 via the transverse sliders 65, so that the relative positions of each light source and the detection camera can be adjusted laterally, meeting the lateral alignment requirements of line light sources of different specifications, improving detection accuracy and adaptation flexibility. In addition, in order to achieve precise positioning and locking after lateral adjustment, the lateral slider 65 is also equipped with a first locking screw 66 for locking the lateral position of the lateral slider 65; rotating the first locking screw 66 can firmly lock the lateral slider 65 onto the lateral guide rail 14 to prevent position displacement due to vibration or external force during the detection process.

[0044] like Figure 6 As shown, the third light source connecting frame 64 is equipped with a line light source 5 to be tested. The third light source connecting frame 64 includes a first vertical rod 86 on a horizontal slider 65, a second U-shaped block 87 installed between the two first vertical rods 86, and the line light source 5 to be tested installed on the second U-shaped block 87. The second U-shaped block 87 and the first vertical rod 86 are fixedly connected by a fourth locking screw 88. Adjusting the tilt angle of the second U-shaped block 87 can achieve the pitch adjustment of the line light source 5 to be tested. After the fourth locking screw 88 is tightened, the second U-shaped block 87 and the first vertical rod 86 are rigidly locked to ensure that the posture of the line light source 5 to be tested remains stable throughout the testing process.

[0045] Furthermore, the first vertical rod 86 is provided with a plurality of vertically arranged vertical mounting holes 89; by replacing the vertical mounting holes 89 of different heights, the vertical adjustment of the line light source 5 to be tested can be achieved, meeting the differentiated requirements of different focal length lenses for the height of the light source; at the same time, the second U-shaped block 87 is provided with a plurality of first longitudinal U-shaped grooves 85, which are used to adjust the longitudinal position of the line light source 5 to be tested; the line light source 5 to be tested can be finely adjusted longitudinally along the first longitudinal U-shaped grooves 85, thereby accurately matching the center of the detection camera 4.

[0046] like Figure 7 As shown, the lateral drive component 3 is mounted on the frame plate 12. The lateral drive component 3 is a lateral drive module, which drives the standard reflector 2 to reciprocate in a lateral linear motion. Figure 3As shown, there are four support rods 11, and the upper part is provided with a receiving groove 111. The receiving groove 111 is used to place the standard reflector 2, and the line light source 5 to be tested is arranged between the support rods 11.

[0047] In another embodiment, the lateral drive module can be replaced with a multi-stage cylinder or servo motor with a synchronous belt structure to adapt to detection scenarios with different accuracy and speed requirements.

[0048] like Figure 4 As shown, the first gantry 611 and the second gantry 621 have the same structure, differing only in placement and the placement of the standard line light source: both include a first inverted U-shaped frame 78, drive rollers 71 on both sides of the first inverted U-shaped frame 78, and several support rollers 72 on the top; an annular belt 73 is fitted onto the drive rollers 71 and the support rollers 72; two vertical sliding blocks 74 are provided on the annular belt 73; to achieve synchronous vertical upward or downward movement of the two vertical sliding blocks 74, one vertical sliding block 74 is fixed to the outside of the annular belt 73, and the other vertical sliding block 74 is fixed to the inside of the annular belt 73; thus, during the rotation of the annular belt 73, the two vertical sliding blocks 74 maintain a constant relative position due to the opposite directions of movement of the inner and outer sides of the belt, thereby... To achieve precise control of synchronous lifting and lowering; to reduce friction in vertical movement and improve movement stability, a vertical guide rail 75 is provided on the inner side of the first inverted U-shaped frame 78, and the vertical sliding block 74 reciprocates vertically along the vertical guide rail 75; furthermore, to drive the annular belt 73 to rotate, a first drive handwheel 76 is installed on one side of one of the drive rollers 71, and the first drive handwheel 76 drives the annular belt 73 to rotate, thereby driving the vertical sliding block 74 to reciprocate vertically along the vertical guide rail 75; to fix the vertical sliding block 74, a second locking screw 77 is also installed on one of the vertical sliding blocks 74 for locking the vertical position of the vertical sliding block 74; after the second locking screw 77 is tightened, the vertical sliding block 74 abuts against the surface of the vertical guide rail 75 to achieve the fixation of the vertical position; when loosened, the sliding freedom is restored.

[0049] like Figure 5 and Figure 8 As shown, a first light source connecting frame 612 is installed on the vertical sliding block 74 of the first gantry 611, and a second light source connecting frame 622 is installed on the vertical sliding block 74 of the second gantry 621.

[0050] Similarly, the first light source connecting frame 612 and the second light source connecting frame 622 have the same structure. Both the first light source connecting frame 612 and the second light source connecting frame 622 include a first horizontal rod 81 mounted on the vertical sliding block 74, a first U-shaped block 82 mounted between the two first horizontal rods 81, and a first standard line light source 61 or a second standard line light source 62 mounted on the first U-shaped block 82. The first U-shaped block 82 can adjust its own pitch angle, thereby adjusting the projection of the first standard line light source 61 or the second standard line light source 62. The tilt angle facilitates subsequent tilting and alignment with the standard reflector 2. The first U-shaped block 82 and the first horizontal rod 81 are fixedly connected by the third locking screw 83. After loosening the third locking screw 83, the pitch angle of the first U-shaped block 82 can be finely adjusted, and tightening it locks the tilt angle. In order to make the lateral position of the first standard line light source 61 or the second standard line light source 62 adjustable, the first horizontal rod 81 is provided with several horizontally arranged horizontal mounting holes 84. The lateral position of the first standard line light source 61 and the second standard line light source 62 can be adjusted by changing the mounting position.

[0051] Furthermore, the first U-shaped block 82 is provided with a plurality of first longitudinal U-shaped grooves 85, which are used to adjust the longitudinal position of the first standard line light source 61 or the second standard line light source 62.

[0052] like Figure 9 and Figure 10 As shown, the third gantry 631 includes a second inverted U-shaped frame 79 and ball screws 91 mounted on both sides of the second inverted U-shaped frame 79. Vertical sliders 92 are mounted on the ball screws 91, and the ball screws 91 drive the vertical sliders 92 to move vertically along the ball screws 91. A longitudinal plate 93 is mounted between the two vertical sliders 92, and the longitudinal plate 93 is mounted inside the second inverted U-shaped frame 79. The ends of the two ball screws 91 are connected by a synchronous belt 94, thereby achieving synchronous lifting and lowering of the two vertical sliders 92, ensuring that the longitudinal plate 93 remains horizontal and reciprocates vertically along the ball screws 91. A second drive handwheel 95 is mounted on one side of one of the ball screws 91, and the second drive handwheel 95 is connected to the ball screw 91 via a universal joint 90. The second drive handwheel 95 drives the ball screw 91 to rotate, thereby driving the longitudinal plate 93 to reciprocate vertically.

[0053] Furthermore, in order to achieve precise positioning and stable locking of the longitudinal plate 93, a fifth locking screw 96 for locking the second drive handwheel 95 is also installed on one side of the second drive handwheel 95; after tightening the fifth locking screw 96, the rotation of the ball screw 91 can be completely locked to prevent the longitudinal plate 93 from undergoing micro-displacement during the measurement process; when loosened, the manual adjustment function is restored to ensure smooth lifting and precise positioning.

[0054] Furthermore, to make the longitudinal movement of the detection camera 4 more stable, a first longitudinal guide rail 97 is installed on the longitudinal plate 93, a longitudinal slider 98 is sleeved on the first longitudinal guide rail 97, and a third U-shaped block 99 is installed on the longitudinal slider 98; the detection camera 4 is installed inside the third U-shaped block 99; in other embodiments, a rotation adjuster is installed between the longitudinal slider 98 and the third U-shaped block 99, which can be used to adjust the deflection angle of the third U-shaped block 99 and the detection camera 4 to achieve multi-degree-of-freedom precision alignment.

[0055] like Figure 10 As shown, in order to clamp the detection camera 4, a clamping plate 41 is installed on one side of the detection camera 4. A clamping screw 42 is connected to one side of the clamping plate 41. The clamping screw 42 is threadedly connected to one side of the third U-shaped block 99. Rotating the clamping screw 42 drives the clamping plate 41 to clamp the detection camera 4.

[0056] Furthermore, in order to make the clamping more stable, a second longitudinal guide rail 43 is installed between the clamping plate 41 and the third U-shaped block 99. The clamping plate 41 slides smoothly along the second longitudinal guide rail 43, making the clamping more stable and the clamping force more uniform.

[0057] The first standard line light source 61 and the second standard line light source 62 can be precisely adjusted in three dimensions in the horizontal, vertical, and longitudinal directions, and can also adjust the pitch angle to meet the stringent requirements of optical path alignment and illumination uniformity in different detection scenarios. Furthermore, the line light source 5 to be detected can be precisely adjusted in the horizontal and vertical directions, and its longitudinal and pitch angles can be finely adjusted to ensure its light emission angle. Even further, the detection camera 4 can be independently adjusted vertically, longitudinally, and with pitch angle fine-tuning. All adjustment mechanisms adopt a fine-tuning structure, thereby enabling precise adjustments.

[0058] The steps for using the automatic detection device are as follows:

[0059] Step S1: Install the line light source 5 to be tested and the second U-shaped block 87. The first longitudinal U-shaped groove 85 is used to adjust the longitudinal position of the line light source 5 to be tested. After the line light source 5 to be tested and the second U-shaped block 87 are installed as a whole, they are installed together inside the automatic detection device. Select a suitable height and vertical mounting hole 89, and rigidly lock the second U-shaped block 87 and the first vertical rod 86 with the fourth locking screw 88.

[0060] Step S2: The line light source 5 to be tested, the first standard line light source 61, the second standard line light source 62 and the detection camera 4 are started together. The standard reflector 2 is placed on the upper end of the support rod 11 and driven by the transverse drive component 3.

[0061] Step S3: The lateral drive component 3 drives the standard reflector 2 to move laterally. The detection camera 4 acquires images of the reflected light spots of the standard reflector 2 at different positions in real time. After the standard reflector 2 has completely passed through, the computer obtains a complete two-dimensional image. The software extracts the grayscale values ​​of 9 points from the image (for example, dividing the image into a 3x3 grid and taking the grayscale value at the center of each grid); according to the nine-point value method, one maximum value and one minimum value are removed, and then the average value of the remaining 7 points is calculated.

[0062] Step S4: Determine the uniformity of the light source based on the difference between the average value and each point; set a threshold, if the difference between the gray value of any point and the average value exceeds the threshold, then the uniformity is unqualified.

[0063] In this embodiment, the reference formula for software calculation (depending on the sample type, it can be divided into a conventional 9-point value method or a multi-point value method (more than 9 points))

[0064] Based on the given data: [160.575, 198.650, 182.640, 154.912, 190.883, 174.982, 150.874, 186.801, 171.561];

[0065] Sample size: n=9

[0066] 1. Calculate the average value (μ)

[0067] μ=(160.575+198.650+182.640+154.912+190.883+

[0068] (174.982 + 150.874 + 186.801 + 171.561) / 9

[0069] μ = 1581.878 / 9 = 175.764

[0070] 2. Calculate the standard deviation (σ)

[0071] (160.575-175.764)²=(-15.189)²=230.71

[0072] (198.650-175.764)²=(22.886)²=523.74

[0073] (182.640-175.764)²=(6.876)²=47.28

[0074] (154.912-175.764)²=(-20.852)²=434.76

[0075] (190.883-175.764)²=(15.119)²=228.57

[0076] (174.982-175.764)²=(-0.782)²=0.61

[0077] (150.874-175.764)²=(-24.890)²=619.49

[0078] (186.801-175.764)²=(11.037)²=121.81

[0079] (171.561-175.764)²=(-4.203)²=17.66

[0080] Sum: Σ(xᵢ-μ)²=2224.63

[0081] σ=√[Σ(xᵢ-μ)² / (n-1)]=√(2224.63 / 8)=√278.079=16.676

[0082] 3. Coefficient of Variation (CV)

[0083] CV=(σ / μ)×100%=(16.676 / 175.764)×100%=9.49%

[0084] During the detection process, the calculated average value (μ) is used as a reference indicator, and the coefficient of variation (CV) is used as the main evaluation indicator.

[0085] According to machine vision industry standards:

[0086] CV≤3%: Excellent uniformity (uniformity≥97%)

[0087] CV ≤ 5%: Good uniformity (uniformity ≥ 95%)

[0088] CV ≤ 8%: Acceptable uniformity (uniformity ≥ 92%)

[0089] In this test, based on the coefficient of variation (CV) evaluation: CV = 9.49%, uniformity needs improvement.

[0090] The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention 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 invention shall be considered equivalent substitutions and shall be included within the protection scope of the present invention.

Claims

1. An automatic detection device for the uniformity of a line light source, characterized in that: The system includes a placement plate (1), on which several support rods (11) are mounted. A standard reflector plate (2) is mounted on the upper end of each support rod (11). The placement plate (1) is connected to a transverse drive component (3). The transverse drive component (3) drives the standard reflector plate (2) to move in a transverse linear reciprocating motion. A detection camera (4) is mounted on the upper part of the standard reflector plate (2). The detection camera (4) takes pictures of the standard reflector plate (2). A line light source (5) to be tested is mounted on the upper or lower part of the standard reflector plate (2). The line light source (5) to be tested emits light outward to illuminate the standard reflector plate (2). The reflected or refracted light is collected by the detection camera (4). Under the transverse drive of the transverse drive component (3), the detection camera (4) takes pictures of the entire standard reflector plate (2) in segments. The uniformity of the illumination of the line light source (5) to be tested is determined based on the grayscale uniformity of the collected images.

2. The automatic detection device for the uniformity of a line light source according to claim 1, characterized in that: The standard reflector (2) has a first standard line light source (61) installed on one side of its upper part and a second standard line light source (62) installed on the other side. The first standard line light source (61) and the second standard line light source (62) both illuminate the standard reflector (2) from the upper part at an angle. The standard reflector (2) has a line light source (5) to be tested installed at the lower part. The line light source (5) to be tested illuminates the standard reflector (2) from the lower part. The light emitted by the first standard line light source (61) and the second standard line light source (62) is reflected by the standard reflector (2) and collected by the detection camera (4). The light emitted by the line light source (5) to be tested is refracted by the standard reflector (2) and also collected by the detection camera (4).

3. The automatic detection device for the uniformity of a line light source according to claim 2, characterized in that: The lower part of the transverse drive component (3) is equipped with a frame plate (12). A first gantry (611) and a second gantry (621) are movably connected to the frame plate (12). The first gantry (611) and the second gantry (621) are arranged vertically side by side. A first light source connecting frame (612) is installed on the first gantry (611), and a first standard line light source (61) is installed on the first light source connecting frame (612). A second light source connecting frame (622) is installed on the second gantry (621), and a second standard line light source (62) is installed on the second light source connecting frame (622).

4. The automatic detection device for the uniformity of a line light source according to claim 3, characterized in that: A third gantry (631) is installed between the first gantry (611) and the second gantry (621). The third gantry (631) is mounted on the frame plate (12). A detection camera (4) is mounted on the third gantry (631). The third gantry (631) drives the detection camera (4) to move longitudinally and vertically to take segmented pictures of the entire standard reflector (2).

5. The automatic detection device for the uniformity of a line light source according to claim 4, characterized in that: A third light source connecting frame (64) is installed between the first gantry (611) and the third gantry (631). The third light source connecting frame (64) is movably connected to the frame plate (12). The third light source connecting frame (64) is equipped with a line light source (5) to be tested. The third light source connecting frame (64) includes a first vertical rod (86) installed on both sides of the frame plate (12), a second U-shaped block (87) installed between the two first vertical rods (86), and a line light source (5) to be tested installed on the second U-shaped block (87). The second U-shaped block (87) and the first vertical rod (86) are fixedly connected by a fourth locking screw (88). The first vertical rod (86) is provided with a plurality of vertically arranged vertical mounting holes (89). The second U-shaped block (87) is provided with a plurality of first longitudinal U-shaped grooves (85). The first longitudinal U-shaped grooves (85) are used to adjust the longitudinal position of the line light source (5) to be tested.

6. The automatic detection device for the uniformity of a line light source according to claim 5, characterized in that: The frame plate (12) is equipped with transverse guide rails (14) on both sides. The transverse guide rails (14) are equipped with a first gantry (611), a second gantry (621) and a third light source connecting frame (64). The lower parts of the first gantry (611), the second gantry (621) and the third light source connecting frame (64) are movably connected to the transverse guide rails (14) through transverse sliders (65). The lower parts of the first gantry (611), the second gantry (621) and the third light source connecting frame (64) move laterally along the transverse guide rails (14) through the transverse sliders (65). The transverse sliders (65) are also equipped with a first locking screw (66) for locking the transverse position of the transverse sliders (65).

7. The automatic detection device for the uniformity of a line light source according to claim 3, characterized in that: The lateral drive component (3) is mounted on the frame plate (12). The lateral drive component (3) is a lateral drive module. The lateral drive module drives the standard reflector plate (2) to move in a lateral linear reciprocating motion. There are four support rods (11), and the upper part is provided with a receiving groove (111). The receiving groove (111) is used to place the standard reflector plate (2). The line light source to be tested (5) is arranged between the support rods (11).

8. The automatic detection device for the uniformity of a line light source according to claim 3, characterized in that: The first gantry (611) and the second gantry (621) both include a first inverted U-shaped frame (78), drive rollers (71) on both sides of the first inverted U-shaped frame (78), and support rollers (72) on the top; annular belts (73) are fitted on the drive rollers (71) and the support rollers (72); two vertical sliding blocks (74) are provided on the annular belts (73); one vertical sliding block (74) is fixed on the outside of the annular belts (73), and the other vertical sliding block (74) is fixed on the inside of the annular belts (73); a vertical guide rail (75) is provided on the inside of the first inverted U-shaped frame (78), and the vertical sliding block (74) The vertical sliding block (74) moves vertically back and forth along the vertical guide rail (75). One of the drive rollers (71) is equipped with a first drive handwheel (76) on one side. The first drive handwheel (76) drives the ring belt (73) to rotate, thereby driving the vertical sliding block (74) to move vertically back and forth along the vertical guide rail (75). One of the vertical sliding blocks (74) is also equipped with a second locking screw (77) for locking the vertical position of the vertical sliding block (74). The first gantry (611) is equipped with a first light source connecting frame (612) on the vertical sliding block (74), and the second gantry (621) is equipped with a second light source connecting frame (622) on the vertical sliding block (74).

9. The automatic detection device for the uniformity of a line light source according to claim 8, characterized in that: The first light source connecting frame (612) and the second light source connecting frame (622) both include a first horizontal rod (81) mounted on a vertical sliding block (74), a first U-shaped block (82) mounted between the two first horizontal rods (81), and a first standard line light source (61) or a second standard line light source (62) mounted on the first U-shaped block (82); the first U-shaped block (82) and the first horizontal rod (81) are fixedly connected by a third locking screw (83), and the first horizontal rod (81) is provided with a plurality of horizontally arranged horizontal mounting holes (84); the first U-shaped block (82) is provided with a plurality of first longitudinal U-shaped grooves (85), and the first longitudinal U-shaped grooves (85) are used to adjust the longitudinal position of the first standard line light source (61) or the second standard line light source (62).

10. An automatic detection device for the uniformity of a line light source according to claim 4, characterized in that: The third gantry (631) includes a second inverted U-shaped frame (79) and ball screws (91) mounted on both sides of the second inverted U-shaped frame (79). Vertical sliders (92) are mounted on the ball screws (91), and a longitudinal plate (93) is mounted between the two vertical sliders (92). The longitudinal plate (93) is mounted inside the second inverted U-shaped frame (79). The ends of the two ball screws (91) are connected by a synchronous belt (94). The longitudinal plate (93) reciprocates vertically along the ball screws (91). A second drive handwheel (95) is mounted on one side of one of the ball screws (91). The second drive handwheel (95) is connected to the ball screw (91) via a universal joint (90). The second drive handwheel (95) drives the ball screw (91) to rotate. The vertical plate (93) is driven to reciprocate vertically; a fifth locking screw (96) for locking the second drive handwheel (95) is also installed on one side; a first longitudinal guide rail (97) is installed on the vertical plate (93), a longitudinal slider (98) is sleeved on the first longitudinal guide rail (97), and a third U-shaped block (99) is installed on the longitudinal slider (98); a detection camera (4) is installed inside the third U-shaped block (99), a clamping plate (41) is installed on one side of the detection camera (4), a clamping screw (42) is connected to one side of the clamping plate (41), and the clamping screw (42) is threadedly connected to one side of the third U-shaped block (99). By rotating the clamping screw (42), the clamping plate (41) is driven to clamp the detection camera (4).

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