Detection system for membrane material detection

Abstract

The utility model provides a detection system for membrane material detection. The detection system comprises a linear array camera and a light source with a built-in lens, the light source is used for providing light in the membrane material detection process, and the light sequentially passes through the lens and the membrane material and then enters the linear array camera; the linear array camera is used for photographing a moving membrane material in the membrane material detection process, and the membrane material comprises a first membrane material and / or a second membrane material; the stations formed by the light source and the linear array camera comprise a first station and / or a second station; in the process of detecting the first film material through the first station, forming a first included angle set by each included angle formed by the light path of each target light ray from the film material to the line-scan digital camera and the center line of the line-scan digital camera; and in the process of detecting the second film material through the second station, each included angle formed by the light path of each target light from the film material to the line-scan digital camera and the center line of the line-scan digital camera forms a second included angle set. According to the system, different detection stations can be provided for different detection requirements, and background textures can be detected or shielded.

Description

Technical Field

[0001] The present application relates to the technical field of film raw material detection, and in particular to a detection system for film material detection. Background Art

[0002] During the manufacturing or pre-processing of film materials, due to the influence of raw materials or processing technology, defects such as crystal points, black spots, pinholes, scratches, coating leaks, mosquitoes, wrinkles, bumps, etc. are generated. With the introduction of machine vision, the film product line has been replaced by high-speed visual online detection methods such as light sources, lenses, and cameras instead of traditional human eye detection.

[0003] Traditional inspection images and traditional film material inspection are transmission inspections, where an LED linear light source is placed below the film material, and a line scan camera is directly opposite or obliquely directed to the light source, where the object focal plane of the line scan camera corresponds to the surface of the film material. After the film material moves, the line scan camera captures the surface image of the film material. Due to the grayscale value or morphological differences between the film material and the defect, and the grayscale value and morphological differences between defects, during inspection, although defects can be detected, the defects do not have a three-dimensional effect, and it is impossible to accurately classify the defects, and the detection rate of minor defects is low. Utility Model Content

[0004] The present application provides a detection system for film material detection, which solves the problem that defects cannot be accurately classified when performing film detection.

[0005] The present application provides a detection system for film material detection, comprising:

[0006] Line scan camera and light source with built-in lens;

[0007] The light source is used to provide light during the process of detecting the film material, and the light passes through the lens and the film material in sequence and then enters the line array camera;

[0008] The line array camera is used to take pictures of the moving film material during the process of detecting the film material to obtain an image for inspecting the film material, wherein the film material includes a first film material and / or a second film material;

[0009] The workstation formed by the light source and the linear array camera includes a first workstation and / or a second workstation;

[0010] In the process of detecting the first film material through the first station, each angle formed by the optical path of each target light from the film material to the line array camera and the center line of the line array camera constitutes a first angle set;

[0011] In the process of detecting the second film material through the second station, each angle formed by the optical path of each target light from the film material to the line array camera and the center line of the line array camera constitutes a second angle set; wherein the target light is a light emitted from the same position along the lens;

[0012] The first angle set is different from the second angle set.

[0013] In some possible implementations, the system further includes:

[0014] During the process of detecting the film material, the light source and the line array camera are respectively located on two sides of the film material, and the light is transmitted from the film material to the line array camera;

[0015] or,

[0016] During the process of detecting the film material, the light source and the line array camera are located on the same side of the film material, and the light is reflected by the film material to the line array camera.

[0017] In some possible implementations, the light source further includes: a light source housing, a shading plate, an acrylic plate, and a light strip;

[0018] The light strip is located inside the light source housing;

[0019] The acrylic plate is located above the light strip, and the lens is located between the acrylic plate and the light strip;

[0020] The shading plate is arranged in parallel with the acrylic plate, and the shading plate is used to block a part of the acrylic plate, and the position not blocked by the shading plate is the light outlet of the light source;

[0021] One side of the shading plate is connected to the light source housing, and the shading area of ​​the shading plate is greater than or equal to one half of the acrylic plate.

[0022] In some possible implementations, the shading plate is located between the acrylic plate and the lens.

[0023] In some possible implementations, the inner diameter of the light source housing is equal to the diameter of the lens; and the shading area of ​​the shading plate is equal to half of the acrylic plate.

[0024] In some possible implementations, angles in a first set of angles between an optical path of the target light from the film material to the line array camera and a center line of the line array camera are all greater than or equal to 4°.

[0025] In some possible implementations, the third angle θ1 of the first station is 4-8°, and the third angle is the angle between the center line of the line array camera and the direction perpendicular to the film material movement direction when the center line of the light source and the center line of the line array camera are not parallel.

[0026] In some possible implementations, the fourth angle θ2 of the first station is 8-12°, and the fourth angle is the angle between the center line of the light source and the direction perpendicular to the film material movement direction when the center line of the light source and the center line of the linear array camera are not parallel.

[0027] In some possible implementations, the fifth angle θ3 of the second station is 6 to 12°, and the fifth angle is the angle between the center line of the line array camera or the light source and the direction perpendicular to the film material movement direction when the center line of the light source and the center line of the line array camera are parallel.

[0028] In some possible implementations, the light strip includes light emitting diodes.

[0029] In some possible implementations, the shading plate and the acrylic plate are connected by adhesive connection or fixed connection by a mechanical structure.

[0030] It can be known from the above technical content that the present application provides a detection system for film material detection, including: a line array camera and a light source with a built-in lens; the light source is used to provide light in the process of detecting the film material, and the light passes through the lens and the film material in sequence and then enters the line array camera; the line array camera is used to take pictures of the moving film material in the process of detecting the film material to obtain an image of the film material for inspection, and the film material includes a first film material and / or a second film material; the workstation formed by the light source and the line array camera includes a first workstation and / or a second workstation; in the process of detecting the first film material through the first workstation, each angle formed by the optical path of each target light from the film material to the line array camera and the center line of the line array camera constitutes a first angle set; in the process of detecting the second film material through the second workstation, each angle formed by the optical path of each target light from the film material to the line array camera and the center line of the line array camera constitutes a second angle set; wherein the target light is a light emitted from the same position along the lens; the first angle set is different from the second angle set.

[0031] In the system provided in the embodiment of the present application, a lens is built into the light source, and the light emitted by the light source is emitted after passing through the lens. When the light passes through the lens, the light at different positions will be deflected to different degrees on the curved surface of the lens, resulting in a certain directionality of the light. The deflected light will be incident on the line array camera, and the line array camera will capture an image based on the incident light. Then, there will be a difference between the light field and the dark field in the image captured by the line array camera. Through the difference between the light field and the dark field, the three-dimensional texture characteristics of the film material will be reflected in the image. In addition, in the system, the workstations formed by the light source and the line array camera can constitute the first workstation and the second workstation. The images captured at different workstations have different requirements for three-dimensional sensitivity, so that the film material can be captured through different workstations according to different detection requirements to obtain an image that meets the corresponding three-dimensional sensitivity. Since the image can reflect the three-dimensional texture characteristics of the film material, different types of defects can be distinguished, solving the problem of the inability to identify the type of defects in the prior art.

[0032] For example, defects in film materials may include crystal points and black spots. In images captured using existing technologies, the grayscale values ​​and shapes of the two are relatively close and cannot be accurately distinguished. However, through the solution provided in the embodiments of the present application, the three-dimensional characteristics of crystal points and black spots can be reflected in the captured images. In the image, the brightness of these two defects is different, so that the two defects can be distinguished. Correspondingly, defects such as oil droplets and water droplets that may exist in film materials can also be distinguished through the solution provided in the embodiments of the present application, solving the problems of the existing technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solution of the present application, the drawings required for use in the embodiments are briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0034] Figure 1 A schematic diagram of the light source structure provided in an embodiment of the present application;

[0035] Figure 2 A schematic diagram of the arrangement positions of the shading plate and the acrylic plate of the light source provided in the embodiment of the present application;

[0036] Figure 3 A schematic diagram of the positions of the linear array camera and the light source at the first station provided in an embodiment of the present application;

[0037] Figure 4 A schematic diagram of the position of a linear array camera and a light source at a second station provided in an embodiment of the present application;

[0038] Figure 5 A schematic diagram of a third angle and a fourth angle provided in an embodiment of the present application;

[0039] Figure 6 The first station and the second station provided in the embodiment of the present application are detection diagrams of the printed original film;

[0040] Figure 7 This is a diagram of the first station and the second station provided in the embodiment of the present application for testing the lithium battery base film;

[0041] Figure 8 This is a diagram of shallow scratch detection of aluminum-plastic base film at the first station and the second station provided in the embodiment of the present application;

[0042] Fig. 9 This is a diagram of detecting small crystal points on the aluminum-plastic base film at the first station and the second station provided in the embodiment of the present application.

[0043] Illustration Description:

[0044] 1-light source; 101-shading plate; 102-acrylic plate; 103-light strip; 2-line array camera; 3-lens. DETAILED DESCRIPTION

[0045] The following embodiments are described in detail, and examples thereof are shown in the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The implementations described in the following embodiments do not represent all implementations consistent with the present application. They are only examples of systems and methods consistent with some aspects of the present application as detailed in the claims.

[0046] To facilitate the technical solution of the application, some concepts involved in the application are first explained below.

[0047] During the manufacturing or pre-processing of film materials, due to the influence of raw materials or processing technology, defects such as crystal points, black spots, pinholes, scratches, coating leaks, mosquitoes, wrinkles, and concave and convex spots may occur. With the introduction of machine vision, the film product line has been replaced by high-speed visual online detection methods such as light sources, lenses, and cameras instead of traditional human eye detection. Among them, the distinction between crystal points and black spots, and the imaging of shallow scratches and shallow concave and convex spots have always been a problem that has troubled machine vision manufacturers.

[0048] Traditional inspection images and traditional film material inspections are transmission inspections, where an LED linear light source is placed below the film material, and a line scan camera is directly opposite or obliquely directed to the light source, wherein the object focal plane of the line scan camera corresponds to the surface of the film material.

[0049] The principle of light transmission of traditional LED line light source is: LED particles emit a beam of light, which is shaped by the lens optical system (rod lens, aspherical lens, free-form surface lens, Fresnel mirror). The upper beam will be deflected downward, and the lower beam will be deflected upward. The upper and lower beams have two different deflection directions. An ideal three-dimensional feature can be understood as a convex or concave arc surface on a plane. If the passing beam has a certain directionality, the light will also have a certain directionality after refraction or reflection on the arc surface. As shown in the figure, the right-facing beam will be deflected to the right of the arc surface normal after passing through the arc surface. If the film moves at this time, the image captured by the camera will have a difference between light and dark fields. The three-dimensional texture characteristics of the film material are described by the difference between light and dark fields. The traditional inspection map and traditional film material inspection are transmission inspections. The LED linear light source is placed below the film material, and the line scan camera is directly opposite or oblique to the light source. The object focal plane of the line scan camera corresponds to the surface of the film material. After the film material moves, the line scan camera takes a picture of the film material surface. Due to the difference in grayscale value or morphology between the film material and the defects, and the difference in grayscale value and morphology between defects, although defects can be detected during inspection, the defects do not have a three-dimensional effect, and it is impossible to accurately classify the defects, and the detection rate of minor defects is low.

[0050] The present application provides a detection system for film material detection to solve the above problems. The system includes a line array camera 2 and a light source 1 with a built-in lens 3. The light source 1 is used to provide light during the process of detecting the film material. The light passes through the lens 3 and the film material in sequence and then enters the line array camera 2.

[0051] The line array camera 2 is used to take pictures of the moving film material during the process of detecting the film material to obtain an image for inspecting the film material. The film material includes a first film material and / or a second film material. The smoothness of different film materials may be different, that is, the system of the present application can detect defects of film materials with different smoothness.

[0052] The workstation formed by the light source 1 and the line array camera 2 includes a first workstation and / or a second workstation; in the process of detecting the first film material through the first workstation, each angle formed by the optical path of each target light from the film material to the line array camera 2 and the center line of the line array camera 2 constitutes a first angle set;

[0053] In the process of inspecting the second film material through the second workstation, each angle formed by the optical path of each target light from the film material to the line array camera 2 and the center line of the line array camera 2 constitutes a second angle set; wherein the target light is a light emitted from the same position along the lens; wherein the first angle set is different from the second angle set.

[0054] In the system provided in the embodiment of the present application, the light source 1 has a built-in lens 3. The light emitted by the light source 1 is emitted after passing through the lens 3. When the light passes through the lens 3, the light at different positions will be deflected to different degrees on the curved surface of the lens 3, resulting in a certain directionality of the light. The deflected light will be incident on the line array camera 2. The line array camera 2 captures an image based on the incident light. Then, the image captured by the line array camera 2 will have a difference between light and dark fields. Through the difference between light and dark fields, the three-dimensional texture characteristics of the film material will be reflected in the image. In addition, in the system, the workstations formed by the light source 1 and the line array camera 2 can constitute the first workstation and the second workstation. The images captured at different workstations have different requirements for three-dimensional sensitivity, so that the film material can be captured through different workstations according to different detection requirements to obtain an image that meets the corresponding three-dimensional sensitivity. Since the image can reflect the three-dimensional texture characteristics of the film material, different types of defects can be distinguished, solving the problem of the inability to identify the type of defects in the prior art.

[0055] During the process of detecting the film material, the light source 1 and the line array camera 2 are respectively located on both sides of the film material, and the light is transmitted from the film material to the line array camera 2;

[0056] or,

[0057] During the process of detecting the film material, the light source 1 and the line array camera 2 are located on the same side of the film material, and the light is reflected by the film material to the line array camera 2 .

[0058] In some embodiments, the first station and the second station in the detection system for film material detection can be a transmission station, that is, the light source 1 and the line array camera 2 are respectively located on both sides of the film material, and the light is transmitted from the film material to the line array camera 2; or a reflection station, that is, the light source 1 and the line array camera 2 are located on the same side of the film material, and the light is reflected from the film material to the line array camera 2. By setting different positional relationships between the light source 1 and the line array camera 2, different detection requirements can be met, and the light source 1 and the line array camera 2 can be installed in the optimal positional relationship according to the actual working environment. For example, a reflection station can be selected when the detection environment area is limited.

[0059] like Figure 1 As shown, the light source 1 further includes: a light source housing, a light shielding plate 101, an acrylic plate 102 and a light strip 103;

[0060] The light strip 103 is located inside the light source housing;

[0061] The acrylic plate 102 is located above the light strip 103, and the lens 3 is located between the acrylic plate 102 and the light strip 103;

[0062] The shading plate 101 is arranged in parallel with the acrylic plate 102, and the shading plate 101 is used to block a part of the acrylic plate 102, and the position not blocked by the shading plate 101 is the light outlet of the light source 1;

[0063] One side of the shading plate 101 is connected to the light source housing. In order to ensure that a light beam with a certain direction is obtained to facilitate expressing the three-dimensional texture characteristics of the film material through the difference between light and dark fields, the shading area of ​​the shading plate 101 is required to be greater than or equal to one half of the acrylic plate 102.

[0064] In addition, in the system provided in the embodiment of the present application, the first angle set and the second angle set are different. If the angle in the first angle set is greater than the angle in the second angle set, the three-dimensional sensitivity of the image taken at the first station is lower, and the three-dimensional sensitivity of the image taken at the second station is higher, the three-dimensional features are more obvious, and the background in the corresponding image is also clearer and more obvious. Therefore, the first station can also be called a low-sensitivity station, and the second station can be called a high-sensitivity station. Of course, if the angle in the first angle set is smaller than the angle in the second angle set, the first station can also be called a high-sensitivity station, and the second station can be called a low-sensitivity station. In the following embodiments, the description is made when the angle in the first angle set is greater than the angle in the second angle set, that is, the first station is a low-sensitivity station, and the second station is a high-sensitivity station.

[0065] On the basis of the design of traditional light sources, the principle of 3D imaging of shading plates is introduced, and a light source 1 capable of photographing 3D defects is designed. A shading plate 101 is arranged on the light source 1. By limiting the shading area of ​​the shading plate 101 to be greater than or equal to one half of the acrylic plate 102, a light beam with a certain direction is obtained. Based on the different positions and lengths of the shading plate 101, each target light produces different light and dark effects on the optical path from the film material to the line array camera 2, so that the grayscale values ​​of the image photographed by the line array camera 2 are different. When the sensitivity is low, the background of the picture is not obvious and the background is shielded. When the sensitivity is high, the background of the picture is relatively obvious and the background texture can be detected. Two different workstations are generated by adjusting the angles and positions of the line array camera 2 and the light source 1. The grayscale value of the image is controlled based on the refractive index of different defects or the dependence of different defects on the background to shield the background, so as to achieve accurate classification of defects, and effectively solve the problems of distinguishing black spots from crystal spots, distinguishing oil droplets from water droplets, and the problems of being unable to detect crystal spots, shallow scratches, and shallow defects.

[0066] In some embodiments, Figure 2As shown, the shading plate 101 is arranged on the lower surface of the acrylic plate 102. In some embodiments, the shading plate 101 can be made of a steel sheet, or any opaque, highly collimated thin material; the connection between the shading plate 101 and the acrylic plate 102 is an adhesive connection or a mechanical structural member fixed connection; when the shading plate 101 is a steel sheet, the steel sheet and the acrylic plate 102 can be glued together on the lower surface.

[0067] In some embodiments, the shading plate 101 is located between the acrylic plate 102 and the lens 3. By arranging the shading plate 101 between the acrylic plate 102 and the lens 3, the shading plate 101 is not easy to fall off from the light source 1 during cleaning and carrying the light source, thereby increasing the service life of the system.

[0068] In some embodiments, the inner diameter of the light source housing is equal to the diameter of the lens 3; the shading area of ​​the shading plate 101 is equal to half of the acrylic plate 102. The inner diameter of the light source housing is equal to the diameter of the lens 3, which is more convenient for installation and fixation; illustratively, the shading area of ​​the shading plate 101 is equal to half of the acrylic plate 102, so that light can be emitted from the center of the lens.

[0069] Taking the transmission type workstation as an example, in some embodiments, Figure 3 As shown, when the center line of the light source 1 and the center line of the line array camera 2 are not parallel, it is the first position; Figure 4 As shown, when the center line of the light source 1 is parallel to the center line of the line array camera 2, it is the second station, the first station is a low-sensitivity station, and the second station is a high-sensitivity station.

[0070] The low-sensitivity station provided in the present application is suitable for scenarios where the surface of the material film is rough and textured, and obvious three-dimensional defects need to be detected; the high-sensitivity station is suitable for scenarios where the surface of the material film is smooth, and tiny three-dimensional defects need to be detected; in some embodiments, the high-sensitivity station can also achieve the background shielding function by changing the position of the scanning line of the linear array camera 2 and the light shielding port of the light source 1.

[0071] In order to cope with different detection requirements, that is, the detection material has background texture, the detection system for film material detection is divided into a low-sensitivity station for distinguishing defects and a high-sensitivity station for detecting background texture. The difference between the low-sensitivity station and the high-sensitivity station lies in the pitch relationship between the linear array camera 2 and the light source 1. When the linear array camera 2 and the light source 1 are in a symmetrical relationship, the three-dimensional effect produced by the defect is stronger, and the three-dimensional characteristics of the background texture will also be detected. In some embodiments, the shading area of ​​the shading plate 101 is one-half of the acrylic plate 102, so that the light can be emitted from the center of the lens 3. At the same time, in order to clearly detect three-dimensional defects, the angle between the center line of the light source 1 and the center line of the linear array camera 2 in the first station is greater than or equal to 4°. When the angle between the linear array camera 2 and the light source 1 is greater than 4°, when the grayscale value of the image is low, the sensitivity of the first station in the film material detection process is low, the background of the picture is not obvious to shield the background, the shallow three-dimensional texture features will not be displayed, and defects such as crystal points can still be detected. When the grayscale value of the image is high, the second station has a higher sensitivity during the film material detection process, the bright effect of the image background part is more obvious, the three-dimensional effect of the second station is more obvious, and the background texture characteristics are prominent.

[0072] The inspection system for film material inspection can provide different inspection stations for different three-dimensional sensitivity inspection requirements, so as to detect or shield the background texture.

[0073] When the shading area of ​​the shading plate 101 is equal to half of the acrylic plate 102, Figure 5 As shown, in the first station, the center line of the light source 1 and the center line of the linear array camera 2 are not parallel, so there is an angle between the center axis and the vertical direction of the light source 1 and the linear array camera 2. Different angles will also lead to differences in the actual detection results. In order to detect or shield the background texture, in some embodiments, the third angle θ1 of the first station is 4 to 8°, and the third angle is the angle between the center line of the linear array camera 2 and the direction perpendicular to the movement of the film material. The fourth angle θ2 of the first station is 8 to 12°, and the fourth angle is the angle between the center line of the light source 1 and the direction perpendicular to the movement of the film material.

[0074] By setting the third angle and the fourth angle of the first station (low-sensitivity station), when the grayscale value of the image is low, the sensitivity of the first station in the film material detection process is low, and the background part of the image is not obvious, ensuring that the first station is less affected by the background texture. The grayscale value of defective images such as crystal points and scratches is different from that of the background image, making it easier to detect or shield the background texture.

[0075] When the shading area of ​​the shading plate 101 is equal to one-half of the acrylic plate 102, since the center line of the light source 1 and the center line of the linear array camera 2 in the second station are parallel, the center line of the linear array camera 1 and the center line of the light source 2 are almost coincident, so the difference between the angle between the linear array camera 1 and the direction perpendicular to the film material movement direction and the angle between the center line of the light source 2 and the direction perpendicular to the film material movement direction is almost 0, so only one angle influencing factor needs to be considered; in some embodiments, the fifth angle θ3 of the second station is 6-12°, and the fifth angle is the angle between the center line of the linear array camera 1 or the light source 2 and the direction perpendicular to the film material movement direction. By changing the distance of the shading plate corresponding to the camera scanning line, when the image grayscale value is high, the second station has a higher sensitivity in the film material detection process, and the bright effect of the image background part is more obvious, which can achieve different three-dimensional defect detection capabilities, and the three-dimensional effect can also expand the area of ​​defect display and improve the detection rate of minor defects.

[0076] Example

[0077] In the film-free state, the angle and position of the linear array camera 2 and the light source 1 are adjusted in the detection system for film material detection so that the scanning line of the linear array camera 2 is at the light shielding port position of the light source 1. The method for determining the light outlet position is through the grayscale value of the image captured by the camera. When the image grayscale value is 0, the camera scanning line is on the light shielding plate 101. When the scanning line leaves the light shielding plate, the image grayscale value will slowly increase. The distance from the light shielding plate 101 corresponds to different image grayscale values. The first station (low-sensitivity station) corresponds to a grayscale value of (10 to 30), and the second station (high-sensitivity station) corresponds to a grayscale value of (20 to 100). Different stations and grayscale values ​​correspond to different test requirements.

[0078] After adjusting the scanning line of the linear array camera 2 and the position of the light shielding port of the light source 1, perform a software flattening operation to offset the unevenness of the background. Then load the film and increase the exposure time of the linear array camera 2 so that the grayscale value of the film background captured by the linear array camera 2 reaches at least 130. This amplifies the grayscale difference between the defect and the background before starting the inspection.

[0079] When the detection system adjusts the angles of the light source 1 and the linear array camera 2, the center line of the linear array camera 2 is located on the surface of the light outlet of the light source 1, but the distance between the position of the center line at the light outlet and the shading plate is different.

[0080] First station and second station test:

[0081] Experimental equipment: 8K linear array camera, light shielding light source, industrial lens;

[0082] Experimental process:

[0083] Adjustment system: distance between light source and film, distance between camera and film.

[0084] Adjust the workstation: camera angle θ 相机 , light source angle θ 光源 , resulting in high and low sensitivity positions. When the camera scanning line is at the knife edge position, the background grayscale of the material film image is low;

[0085] Adjust the camera exposure so that the background grayscale of the film image reaches the detection value and start the test.

[0086] Test samples: crystal points on printed original film, crystal points on lithium battery base film, shallow scratches on aluminum-plastic base film, and small crystal points on aluminum-plastic base film.

[0087] like Figures 6 to 9 The test results show that the low-sensitivity station is insensitive to the background of the test material and can play a shielding role, while the high-sensitivity station helps to detect tiny defects.

[0088] It can be seen from the above embodiments that the method comprises: a line array camera and a light source with a built-in lens; the light source is used to provide light in the process of detecting film materials, and the light passes through the lens and the film material in sequence and then enters the line array camera; the line array camera is used to take pictures of the moving film material in the process of detecting the film material to obtain an image of the film material for inspection, and the film material comprises a first film material and / or a second film material; the workstation formed by the light source and the line array camera comprises a first workstation and / or a second workstation; in the process of detecting the first film material through the first workstation, each angle formed by the optical path of each target light from the film material to the line array camera and the center line of the line array camera constitutes a first angle set; in the process of detecting the second film material through the second workstation, each angle formed by the optical path of each target light from the film material to the line array camera and the center line of the line array camera constitutes a second angle set; wherein the target light is light emitted from the same position along the lens; the first angle set is different from the second angle set. By setting a shading plate in the light source and adjusting the angle and position of the camera and the light source, two different workstations are generated. The light emitted from the light outlet of the light source at different workstations has a certain directionality, so that the grayscale values ​​of the images taken by the cameras at different workstations are different. When the image has a lower grayscale value, the sensitivity of the first workstation in the film material detection process is lower, and the background part of the image is not obvious, so that the first workstation has a certain three-dimensional effect, the defect contrast difference is large, and the background texture can be shielded; when the image grayscale value is higher, the sensitivity of the second workstation in the film material detection process is higher, and the bright effect of the background part of the image is more obvious. The three-dimensional effect of the second workstation is more obvious, and the background texture characteristics are prominent. The present application provides a detection system for film material detection, which can provide different detection workstations for different detection needs to detect or shield the background texture.

[0089] Similar parts between the embodiments provided in this application can be referenced to each other. The specific implementation methods provided above are only a few examples under the general concept of this application and do not constitute a limitation on the protection scope of this application. For those skilled in the art, any other implementation methods expanded based on the scheme of this application without creative work belong to the protection scope of this application.

Claims

1. A detection system for film material detection, characterized in that: include: A line array camera (2) and a light source (1) with a built-in lens (3); The light source (1) is used to provide light during the process of detecting the film material, and the light passes through the lens (3) and the film material in sequence and then enters the line array camera (2); The line array camera (2) is used to take pictures of the moving film material during the process of detecting the film material, so as to obtain an image of the film material for inspection, wherein the film material includes a first film material and / or a second film material; The workstation formed by the light source (1) and the line array camera (2) includes a first workstation and / or a second workstation; In the process of detecting the first film material through the first workstation, each angle formed by the optical path of each target light ray from the film material to the line array camera (2) and the center line of the line array camera (2) constitutes a first angle set; In the process of detecting the second film material through the second workstation, each angle formed by the optical path of each target light ray from the film material to the line array camera (2) and the center line of the line array camera (2) constitutes a second angle set; wherein the target light ray is a light ray emitted from the same position along the lens; The first angle set is different from the second angle set.

2. The system according to claim 1, characterized in that During the process of detecting the film material, the light source (1) and the line array camera (2) are respectively located on two sides of the film material, and the light is transmitted from the film material to the line array camera (2); or, During the process of detecting the film material, the light source (1) and the line array camera (2) are located on the same side of the film material, and the light is reflected by the film material to the line array camera (2).

3. The system according to claim 1, characterized in that The light source (1) further comprises: a light source housing, a light shielding plate (101), an acrylic plate (102) and a light-emitting light bar (103); The light-emitting light bar (103) is located inside the light source housing; The acrylic plate (102) is located above the light strip (103), and the lens (3) is located between the acrylic plate (102) and the light strip (103); The shading plate (101) is arranged in parallel with the acrylic plate (102), the shading plate (101) is used to block a portion of the acrylic plate (102), and the position not blocked by the shading plate (101) is the light outlet of the light source (1); One side of the shading plate (101) is connected to the light source housing, and the shading area of ​​the shading plate (101) is greater than or equal to one half of the acrylic plate (102).

4. The system according to claim 3, characterized in that The shading plate (101) is located between the acrylic plate (102) and the lens (3).

5. The system according to claim 3, characterized in that The inner diameter of the light source housing is equal to the diameter of the lens (3); and the shading area of ​​the shading plate (101) is equal to one half of the acrylic plate (102).

6. The system according to claim 5, characterized in that The angles in the first set of angles between the optical path of the target light from the film material to the line array camera (2) and the center line of the line array camera (2) are all greater than or equal to 4°.

7. The system according to claim 6, characterized in that The third angle θ1 of the first station is 4 to 8°, and the third angle is the angle between the center line of the line array camera (2) and the direction perpendicular to the film material movement direction when the center line of the light source (1) and the center line of the line array camera (2) are not parallel.

8. The system according to claim 6, characterized in that The fourth angle θ2 of the first station is 8-12°, and the fourth angle is the angle between the center line of the light source (1) and the direction perpendicular to the moving direction of the film material when the center line of the light source (1) and the center line of the linear array camera (2) are not parallel.

9. The system according to claim 2, characterized in that The fifth angle θ3 of the second workstation is 6 to 12°, and the fifth angle is the angle between the center line of the line array camera (2) or the center line of the light source (1) and the direction perpendicular to the moving direction of the film material when the center line of the light source (1) and the center line of the line array camera (2) are parallel.

10. The system according to claim 3, characterized in that The light strip (103) comprises a light emitting diode.

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