Grid type defect detection stripe light source

Abstract

The utility model relates to the technical field of defect detection, in particular to a grating type defect detection stripe light source. The utility model relates to a grating type defect detection stripe light source which comprises a light source main body provided with an accommodating cavity; the base is arranged in the accommodating cavity; the light-emitting strips are arranged at intervals in the first direction, each light-emitting strip comprises a substrate and a light-emitting element, the substrates are installed on the base, and the light-emitting elements are installed on the substrates; the grating is arranged between every two adjacent light-emitting strips; the light-emitting side assembly is connected with the light source main body, the light-emitting side assembly is located on the side, back to the substrate, of the light-emitting element, and the surface, back to the light-emitting strip, of the light-emitting side assembly is an arc-shaped surface; the secondary light distribution device is located between the light-emitting strip and the light-emitting side assembly. The utility model can improve the definition of defect images.

Description

Technical Field

[0001] This utility model relates to the field of defect detection technology, and in particular to a grid-type defect detection stripe light source. Background Technology

[0002] With the rapid development of industrial automation and intelligent manufacturing, machine vision-based online defect detection has been widely applied in electronics, automotive, food, and pharmaceutical industries. Traditional manual visual inspection, due to its strong subjectivity, susceptibility to fatigue, and high rate of missed detections, is no longer sufficient to meet the high reliability and efficiency requirements of modern production lines. In contrast, industrial cameras combined with image processing algorithms can quickly locate and identify small, low-contrast defects, helping to improve production yield and quality stability.

[0003] In practical applications, stripe light sources are not only used for three-dimensional dimensional measurement but also frequently used for planar defect detection. Most existing stripe light source systems employ LCD panels, passively controlling the panel to project alternating bright and dark stripes. While these passive light-emitting devices are compact, they suffer from the following main drawbacks: limited brightness—the maximum brightness of the LCD panel often fails to meet the dynamic detection requirements of low-reflectivity or dark-colored workpieces, resulting in insufficient contrast in the captured image and difficulty in revealing defects; traditional projected stripes are mostly planar rectangles, requiring multiple adjustments to the light source position and angle to achieve full coverage in scenarios with complex workpiece geometry or irregular surfaces, reducing detection efficiency; the passively projected aperture stripes lack sufficient optical cutoff effect at the edges, resulting in a wide transition at the bright-dark boundary during imaging, which can blur the features of some small-sized or low-contrast defects, increasing the complexity of backend algorithm processing and even leading to missed detections. Utility Model Content

[0004] In view of this, the present invention provides a grid-type defect detection stripe light source to solve the technical problem of low contrast and blurred features in defect images caused by existing light sources.

[0005] In a first aspect, this utility model provides a grid-type defect detection stripe light source, comprising:

[0006] The main body of the light source is provided with a receiving cavity;

[0007] A base is disposed within the accommodating cavity;

[0008] A plurality of light-emitting strips are arranged at intervals along a first direction. Each light-emitting strip includes a substrate and a light-emitting element. The substrate is mounted on the base, and the light-emitting element is mounted on the substrate.

[0009] A grille is positioned between two adjacent light-emitting strips;

[0010] The light-emitting side assembly is connected to the main body of the light source. The light-emitting side assembly is located on the side of the light-emitting element that faces away from the substrate. The surface of the light-emitting side assembly that faces away from the light-emitting strip is an arc-shaped surface.

[0011] A secondary light distribution device is located between the light-emitting strip and the light-emitting side component.

[0012] Preferably, the light-emitting side assembly includes a first transparent plate, a parallel film, and a second transparent plate stacked sequentially.

[0013] Preferably, the plurality of light-emitting strips are arranged at equal intervals along the first direction, and the grille is arranged at equal intervals along the first direction.

[0014] Preferably, the secondary light distribution device is an optical lens.

[0015] Preferably, the optical lens is an aspherical lens, and the light emitted by the light-emitting element is modulated by the optical lens and converges in a direction perpendicular to the arc-shaped surface of the light-emitting side component.

[0016] Preferably, let the distance from the top of the secondary light distribution device to the top of the grid be d, the grid width be w1, the spacing between two adjacent grids be w2, and the light output angle after modulation by the secondary light distribution device be β, then 2d×tan(β)≤w1+w2.

[0017] Preferably, the light source body includes a base plate, two baffles and two side plates, the base plate, two baffles and two side plates forming a cuboid frame with one end open, and the light-emitting side component 6 is located at the opening.

[0018] Preferably, a first heat dissipation structure is provided on one end of the base facing the baffle, the first heat dissipation structure including a plurality of spaced first heat dissipation plates, and a second heat dissipation structure is provided on one end of the base facing the bottom plate, the second heat dissipation structure including a plurality of spaced second heat dissipation plates.

[0019] Preferably, the base is further provided with a cavity, which connects the first heat dissipation structure and the second heat dissipation structure.

[0020] Preferably, a flange is also provided on the side of the base plate facing away from the light-emitting side component 6.

[0021] In summary, the beneficial effects of this utility model are as follows:

[0022] The grid-type defect detection stripe light source provided by this utility model arranges light-emitting strips with light-emitting elements at equal intervals along a first direction to emit light beams. A light-shielding grid is inserted between adjacent light-emitting strips, thereby utilizing the grid width to shield lateral diffused light and only allowing paraxial light to pass through to form sharp bright stripes. The light-emitting side component adopts an arc-shaped structure, and the modulation effect of the light beam of the light-emitting element by the secondary light distribution device makes the parallel light beam passing through the grid illuminate the workpiece surface at an appropriate angle at each incident point, avoiding the stripe contrast attenuation caused by excessive oblique illumination. Thus, it can still maintain the maximum difference between the central brightness peak and the dark stripe depth on low-reflection or dark surfaces. It can also cover multiple non-planar shapes at one time, greatly reducing the movement and re-shooting of the light source and camera, and ensuring clear imaging of small-sized and low-contrast defects in dynamic detection. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments of this utility model will be briefly introduced below. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, and these are all within the protection scope of this utility model.

[0024] Figure 1 This is a three-dimensional structural schematic diagram of the grid-type defect detection stripe light source of this utility model.

[0025] Figure 2 This is a schematic diagram of the internal structure of the grid-type defect detection stripe light source of this utility model.

[0026] Figure 3 This is a schematic diagram of the structure of the light-emitting strips and the grid arranged at intervals in this utility model.

[0027] Figure 4 This is a schematic diagram illustrating the principle of the secondary light distribution device and the optimization of the width and depth of the grid in this utility model.

[0028] Figure 5 This is a schematic diagram of the light-emitting side component in this utility model.

[0029] Figure 6 This is a three-dimensional structural diagram of the base in this utility model.

[0030] Figure 7 These are defect images acquired using existing low-contrast light sources.

[0031] Figure 8 These are defect images acquired using the light source described in this invention.

[0032] Figure 9 It is a defect image with multiple irregular surfaces acquired using the light source in this utility model.

[0033] The components and their numbers shown in the picture:

[0034] The light source body 1, base plate 11, baffle 12, side plate 13, accommodating cavity 14, base 2, light-emitting strip 3, grid 4, secondary light distribution device 5, light-emitting side assembly 6, first transparent plate 61, parallel film 62, second transparent plate 63, flange 111, first heat dissipation structure 21, first heat dissipation plate 211, second heat dissipation structure 22, second heat dissipation plate 221, cavity 23, substrate 31, and light-emitting element 32. Detailed Implementation

[0035] The features and exemplary embodiments of various aspects of this utility model will now be described in detail. To make the objectives, technical solutions, and advantages of this utility model clearer, the following description, in conjunction with the accompanying drawings and embodiments, will provide a further detailed description. It should be understood that the specific embodiments described herein are configured only to explain this utility model and are not configured to limit it. For those skilled in the art, this utility model can be implemented without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of this utility model by illustrating examples of it.

[0036] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes said element.

[0037] It should be noted that all actions involving the acquisition of signals, information, or data in this utility model are carried out in compliance with the relevant data protection laws and regulations of the locality and with authorization from the owner of the corresponding device.

[0038] Example 1

[0039] Please see Figure 1 This embodiment provides a grid-type defect detection stripe light source, including: a light source body 1, a base 2, several light-emitting strips 3, a grid 4, and a light-emitting side component 6.

[0040] like Figure 2As shown, the light source body 1 is provided with a receiving cavity 14. The light source body 1 refers to the outer shell structure of the entire stripe light source device, which forms the receiving cavity 14 inside. This cavity is used to support and fix all functional components, providing both mechanical support and space for the internal optical mechanism. The aforementioned receiving cavity 14 refers to the open space set inside the light source body 1, used to install the base 2, light-emitting strips 3, grids 4, and secondary light distribution devices 5, etc. Its size and shape are designed to allow for assembly based on the shape of each component, ensuring that the light path is not obstructed by external factors after installation.

[0041] The base 2 is disposed in the accommodating cavity 14; in this embodiment, the base 2 is a bearing platform installed at the bottom of the accommodating cavity 14, usually made of thermally conductive aluminum alloy, and fixed to the accommodating cavity 14 by screw holes or slots; the base 2 has several equidistant mounting holes for fixing the substrate 31 of several light-emitting strips 3.

[0042] like Figure 2 and Figure 3 As shown, the plurality of light-emitting strips 3 are arranged at intervals along a first direction. Each light-emitting strip 3 includes a substrate 31 and a light-emitting element 32. The substrate 31 is mounted on the base 2, and the light-emitting element 32 is mounted on the substrate 31. The aforementioned light-emitting strip 3 is an assembly of light source units arranged at equal intervals along a first direction, wherein the first direction is the stripe extension direction, including:

[0043] The substrate 31 in the light-emitting strip 3 serves as a mechanical carrier and conductive platform. It is usually a metal substrate 31 or a metal plate with an insulating layer, on which wiring is laid and light-emitting elements 32 are soldered. It is connected to the base 2 by bolts through the mounting holes on the substrate 31 to achieve precise positioning.

[0044] The light-emitting element 32 in the light-emitting strip 3 can be a high-brightness LED chip or packaged lamp bead soldered to the surface of the substrate 31, which is the primary light source; its arrangement density, packaging type and electrical connection method directly determine the brightness and divergence angle.

[0045] like Figure 3 As shown, the grille 4 is positioned between two adjacent light-emitting strips 3; the material of the grille 4 can be black aluminum alloy or engineering plastic, and it has a preset width and depth; its function is to shield the lateral diffused light between the light-emitting strips 3, allowing only the near-axis direct light to pass through, thereby forming alternating bright and dark stripes.

[0046] The light-emitting side component 6 is connected to the light source body 1. The light-emitting side component 6 is located on the side of the light-emitting element 32 facing away from the substrate 31. The surface of the light-emitting side component 6 facing away from the light-emitting strip 3 is an arc-shaped surface.

[0047] The aforementioned light-emitting side component 6 is an optical structure unit connected to the light source body 1. The side of it facing away from the light-emitting strip 3 is a customized arc-shaped surface. The arc-shaped surface is designed according to the distribution parameters of the irregular surface of the target workpiece, so that the parallel light beams emitted through the grid 4 and the secondary light distribution device 5 can vertically irradiate the surface to be tested at each incident point, thereby achieving one-time coverage of multiple non-planar shapes and maintaining high-contrast stripes.

[0048] like Figure 4 As shown, the secondary light distribution device 5 is located between the light-emitting strip 3 and the light-emitting side component 6. In this embodiment, the secondary light distribution device 5 corresponds one-to-one with the light-emitting element 32 in an array; its function is to converge or correct the primary beam emitted by the LED, making the light more parallel in the direction perpendicular to the light strip, enhancing the brightness of the center of the light strip and improving the edge cutoff effect.

[0049] like Figure 5 As shown, in this embodiment, the light-emitting side component 6 includes a first transparent plate 61, a parallel film 62, and a second transparent plate 63 stacked in sequence.

[0050] The aforementioned first transparent plate 61 and second transparent plate 63 both refer to flat materials with high light transmittance (such as acrylic or tempered glass, etc., used to provide mechanical support and protection for the internal light path; among them, the parallel film 62 is an elastic film with a certain degree of elasticity and optical flatness, used to eliminate gaps or wrinkles that may be generated between the transparent plates, and to maintain the flatness of the overall structure and the consistency of the light path.

[0051] In the light-emitting side assembly 6, the first transparent plate 61, the parallel film 62, and the second transparent plate 63 are stacked sequentially, and the three are fixed by edge slots or a pressing structure. The parallel film 62 is held between the two transparent plates, and during assembly, the film can automatically unfold under slight tension to fill all unevenness or small gaps between the two plates, thereby forming a smooth and tightly fitted optical interface. In this embodiment, the use of the parallel film 62 in the aforementioned structure can eliminate air layers and wrinkles between the transparent plates, making the light-emitting surface a true optical flat plate, avoiding local brightness abrupt changes and beam scattering caused by surface unevenness. After adopting a multi-layered stacked structure, the transmittance is stable and the optical thickness is consistent throughout the entire area, ensuring that the striped light formed by the grid 4 maintains the same brightness and contrast across the entire light-emitting surface. This embodiment introduces a parallel film 62 with self-unfolding properties between two transparent plates. This structure maintains the mechanical strength of the light-emitting side component 6 and also utilizes the self-adhesion of the elastic film to eliminate minor surface defects and gaps, ensuring the continuity of the optical path and the flatness of the light-emitting surface. This provides stable and high-quality stripe illumination during high-speed dynamic detection and avoids contrast attenuation or blurring caused by optical path distortion in defect imaging.

[0052] In this embodiment, the plurality of light-emitting strips 3 are arranged at equal intervals along the first direction, and the plurality of grilles 4 are arranged at equal intervals along the first direction.

[0053] Equal spacing means that the center line distance between each light-emitting strip 3 (or grid 4) is equal, ensuring that the spacing between two adjacent light-emitting strips 3 or two grids 4 is constant in the first direction; the aforementioned first direction is the direction in which the stripe light extends, and it is also the overall direction of the arrangement of the light-emitting strips 3 and grids 4.

[0054] Within the cavity 14 of the same light source body 1, all light-emitting strips 3 are arranged sequentially along the first direction with the same center-to-center distance; simultaneously, the grid plate 4 is also placed between adjacent light-emitting strips 3 with the same center-to-center distance along the same direction. The equidistant arrangement of the two forms a periodic bright-dark-bright-dark stripe structure, and the width and spacing of each bright and dark stripe remain completely consistent across the entire light-emitting surface. The equidistant spacing ensures that the width and spacing of each bright and dark stripe are the same throughout the entire detection field of view, resulting in no regional differences in the grating pattern acquired by the camera, facilitating accurate extraction of the stripe center line and calculation of the defect location by subsequent image processing algorithms. The constant bright-dark cycle minimizes contrast fluctuations, avoiding brightness superposition or light penetration in dark areas caused by local spacing variations, thus steadily improving the local contrast of the defect. The fixed stripe cycle provides uniform parameters for calibration, eliminating the need for multiple calibrations for different areas and reducing the workload of system deployment and debugging. By strictly controlling the equidistant installation of the light-emitting stripes 3 and the grid 4, the stripe light output by the light source forms a highly periodic bright-dark pattern with consistent spatial frequency. When the camera takes pictures from any position, the period of the received stripe signal remains unchanged. The periodic model can be used to accurately locate the edge of the defect, achieving high-precision and high-stability defect detection.

[0055] In these two embodiments, the secondary light distribution device 5 is an optical lens. An optical lens is a transparent optical element that can change the direction of light propagation through refraction. The optical lens focuses or corrects the primary beam emitted by the LED into more parallel light, significantly enhancing the light intensity concentration at the center of the bright stripe and improving the optical cutoff effect at the edge, thereby forming sharp, high-contrast striped light after passing through the light-shielding grille 4.

[0056] The optical lens is an aspherical lens. The light emitted by the light-emitting unit is modulated by the optical lens and emitted perpendicularly to the arc-shaped surface of the light-emitting component 6. An aspherical lens is defined as a lens whose front and rear optical surfaces have curvatures that are not uniformly spherical, allowing for differentiated refraction based on the angle of the incident beam. The light refracted by the lens is redirected and converged in a direction aligned with the normal to the arc-shaped surface for collimation and focused illumination.

[0057] Structurally, each LED light-emitting unit faces an aspherical lens. The curved surface profile of the lens is designed in conjunction with the LED divergence angle, the curvature of the light-emitting side arc surface, and the detection distance to form an array. By precisely correcting the light rays with different incident angles through aspherical refraction, the parallel light after passing through the light-shielding grid 4 not only has a more concentrated center brightness, but also achieves uniform vertical illumination on the entire curved light-emitting surface, which greatly improves the stripe contrast and imaging consistency of key parts of the irregular surface. Specifically, the refraction angle can be finely adjusted by using the aspherical lens elements to reconstruct the originally divergent LED beam into collimated light along the normal direction, so as to minimize the contrast attenuation and geometric distortion caused by oblique incidence.

[0058] like Figure 4 Let the distance from the top of the secondary light distribution device 5 to the top of the grid 4 be d, the width of the grid 4 be w1, the distance between two adjacent grids 4 be w2, and the output angle after modulation by the secondary light distribution device 5 be β. Then we have 2d×tan(β)<w1+w2.

[0059] The aforementioned d represents the vertical distance from the top of the secondary light distribution device 5 to the top of the grid 4, i.e., the effective depth of the grid 4. w1 represents the width of the grid 4 plate, i.e., the physical width of the dark stripe. w2 represents the gap between two adjacent grid 4 plates, i.e., the physical width of the bright stripe; β represents the maximum half-angle divergence angle between the output beam modulated by the lens and the normal direction. In this embodiment, based on the use of lens refraction to deflect light rays at different exit angles to the paraxial direction and reduce lateral diffuse light, it further cooperates with the grid 4 with optimized width-to-depth ratio to prevent the bright stripe beam from "crossing" the dark area into the adjacent bright area, thus avoiding optical crosstalk between adjacent stripes; the beam is precisely truncated at the edge of the grid 4, presenting a steep transition between light and dark, improving the local contrast of defect imaging; regardless of the position and angle of the shot, the stripe period and contrast remain consistent, facilitating subsequent algorithm extraction and defect localization.

[0060] like Figure 1 As shown, in this embodiment, the light source body 1 includes a base plate 11, two baffles 12, and two side plates 13. The base plate 11, the two baffles 12, and the two side plates 13 form a cuboid frame with one end open, and the light-emitting side component 6 is located at the opening. The base plate 11 is the bottom support of the light source body 1, used to fix and support the internal components; the baffles 12 are short plates located at both ends of the base plate 11, used to close the lateral passage and provide positioning surfaces for the grille 4 and the light-emitting strip 3; the side plates 13 are long plates connecting the base plate 11 and the baffles 12 to form a frame, used to constitute lateral support for the overall shell; the aforementioned cuboid frame is the open structure formed by the base plate 11, the two baffles 12, and the two side plates 13, with the opening directly facing the light-emitting side component 6.

[0061] In this embodiment, the light source body 1 is assembled from a base plate 11, two baffles 12, and two side plates 13 into a cuboid box with one open end. All plates are precisely positioned and fixed using screw holes or slots, ensuring the rigidity of the frame structure and the stability of its internal dimensions. The light-emitting side component 6 is installed precisely at this opening, aligned with the internal light-emitting strip 3 and the grille 4, forming a complete light path channel. This frame structure provides reliable mechanical support and a positioning reference for optical components, and also allows the light-emitting side component 6 to fit tightly with the internal light source and grille 4, avoiding light leakage and interference from external stray light. At the same time, the structural components can be modularly produced and quickly assembled, improving manufacturing efficiency and ease of maintenance.

[0062] like Figure 6 As shown, a first heat dissipation structure 21 is provided on one end of the base 2 facing the baffle 12. The first heat dissipation structure 21 includes a plurality of spaced heat dissipation plates. A second heat dissipation structure 22 is provided on one end of the base 2 facing the bottom plate 11. The second heat dissipation structure 22 includes a plurality of spaced second heat dissipation plates 221.

[0063] Both the first heat dissipation structure 21 and the second heat dissipation structure 22 are passive heat dissipation structures installed at both ends of the base 2, consisting of several spaced-apart plate-like structures to increase the contact area with air; wherein the first heat dissipation plate 211 and the second heat dissipation plate 221 are metal plates with good thermal conductivity. In this embodiment, the heat dissipation plate array set at both ends and the bottom of the base 2 quickly conducts the heat generated by the LED light-emitting strip 3 and surrounding electronic components to the surface of the base 2, and efficiently exchanges heat with the outside air through the heat dissipation plates, significantly reducing the temperature rise of the shell and achieving multi-faceted three-dimensional heat dissipation; the two ends correspond to different areas of concentrated heat, avoiding the bottleneck of single-sided heat dissipation and maintaining the overall temperature uniformity of the light source. In this embodiment, the large area of ​​the heat dissipation plate in contact with the air is used to dissipate the heat inside the base 2 simultaneously along both ends through natural convection or forced convection with a fan; the gaps between the heat dissipation plates ensure air circulation channels, enhance heat exchange efficiency, thereby maintaining the LED light-emitting element 32 within the optimal operating temperature range, ensuring stable brightness and long-term reliable operation of the light source.

[0064] In this embodiment, a cavity 23 is also provided on the base 2, which connects the first heat dissipation structure 21 and the second heat dissipation structure 22.

[0065] Cavity 23 refers to a through cavity opened inside the base 2, which runs perpendicular to the side plate 13 and penetrates the base 2. An internal cavity 23 is reserved between the two end heat sink arrays on the base. This cavity 23 extends through the thickness of the base, forming a channel connecting the first heat sink structure 21 and the second heat sink structure 22. The wall of cavity 23 is tightly fitted to the heat sink and integrally formed with the base, ensuring structural strength and dimensional accuracy. In this embodiment, the cavity 23 connects the two end heat sink arrays into a unified ventilation channel, forming a continuous convection circulation. This internally and externally connected airflow design significantly improves the overall heat exchange of the heat sink array.

[0066] A flange 111 is also provided on the side of the base plate 11 facing away from the light-emitting side assembly 6. The flange 111 is a disc-shaped connector with standard mounting holes for mechanical interface docking. In this embodiment, the standardized interface of the flange 111 cooperates with the robot's end flange or positioning pin to achieve rapid positioning and locking of the light source body 1. This allows for flexible deployment in assembly lines or mobile inspection scenarios, maintaining stable alignment between the optical path and the camera. This ensures clearer light source contours and more prominent defect edge features during dynamic inspection, improving the accuracy of stripe illumination and imaging consistency.

[0067] For the improvement in image acquisition effect after adopting this utility model, see [reference needed]. Figure 7 and Figure 8 ,from Figure 8 and Figure 7 The comparison shows that, compared with the existing technology, the images acquired using the light source of this utility model are superior.

[0068] from Figure 9 As can be seen from the above, the light source of this invention can enable a single camera to simultaneously capture multiple irregular surfaces across the field of view, and can ensure that the imaging quality meets the requirements of dynamic detection.

[0069] The above description is merely a specific embodiment of this utility model. Those skilled in the art will understand that, for the sake of convenience and brevity, the specific working processes of the systems, modules, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here. It should be understood that the protection scope of this utility model is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this utility model, and these modifications or substitutions should all be covered within the protection scope of this utility model.

Claims

1. A grid defect detection fringe light source characterized by, include: The main body of the light source is provided with a receiving cavity; A base is disposed within the accommodating cavity; A plurality of light-emitting strips are arranged at intervals along a first direction. Each light-emitting strip includes a substrate and a light-emitting element. The substrate is mounted on the base, and the light-emitting element is mounted on the substrate. A grille is positioned between two adjacent light-emitting strips; The light-emitting side assembly is connected to the main body of the light source. The light-emitting side assembly is located on the side of the light-emitting element that faces away from the substrate. The surface of the light-emitting side assembly that faces away from the light-emitting strip is an arc-shaped surface. A secondary light distribution device is located between the light-emitting strip and the light-emitting side component.

2. The grid pattern defect detection fringe light source according to claim 1, characterized by, The light-emitting side assembly includes a first transparent plate, a parallel film, and a second transparent plate stacked in sequence.

3. The grid pattern defect detection fringe light source according to claim 1, wherein The plurality of light-emitting strips are arranged at equal intervals along the first direction, and the grille is arranged at equal intervals along the first direction.

4. The grid-type defect detection stripe light source according to claim 1, characterized in that, The secondary light distribution device is an optical lens.

5. The grid pattern defect detection fringe light source according to claim 4, characterized by, The optical lens is an aspherical lens, and the light emitted by the light-emitting element is modulated by the optical lens and converges in a direction perpendicular to the arc-shaped surface of the light-emitting side component.

6. The grid pattern defect detection fringe light source according to claim 1, wherein Let the distance from the top of the secondary light distribution device to the top of the grid be d, the grid width be w1, the spacing between two adjacent grids be w2, and the output angle after modulation by the secondary light distribution device be β. Then we have 2d×tan(β)≤w1+w2.

7. The grid pattern defect detection fringe light source according to any one of claims 1 to 6, characterized by, The light source body includes a base plate, two baffles and two side plates. The base plate, two baffles and two side plates form a cuboid frame with one end open. The light-emitting side component is located at the opening.

8. The grid pattern defect detection fringe light source according to claim 7, wherein A first heat dissipation structure is provided on one end of the base facing the baffle. The first heat dissipation structure includes a plurality of spaced first heat dissipation plates. A second heat dissipation structure is provided on one end of the base facing the bottom plate. The second heat dissipation structure includes a plurality of spaced second heat dissipation plates.

9. The grid pattern defect detection fringe light source according to claim 8, characterized by, The base is also provided with a cavity, which connects the first heat dissipation structure and the second heat dissipation structure.

10. The grid pattern defect detection fringe light source according to claim 7, wherein A flange is also provided on the side of the base plate facing away from the light-emitting side assembly.

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