Multi-mode detection device

Abstract

The utility model discloses a multi-mode detection device, and relates to the technical field of printing product quality detection.The device comprises a first illumination light source, a second illumination light source, an acquisition system and a reflector, the second illumination light source comprises a tunnel-shaped diffusion plate and lamp beads, and the lamp beads are located on the inner sides of the two edges of the diffusion plate; light rays are reflected to a detection area under the second illumination light source through the tunnel-shaped diffusion plate, a light inlet and a light outlet are symmetrically formed in the two sides of the tunnel-shaped diffusion plate, the first illumination light source is arranged on the outer side of the light inlet, the light rays of the first illumination light source are emitted to the detection area under the second illumination light source through the light inlet, and the reflector is arranged on the outer side of the light outlet. The reflecting system is used for reflecting light of the light outlet to the acquisition system, and the acquisition system is used for acquiring an image of a target product; according to the technical scheme, different detection effects can be achieved by adjusting different light source brightness ratios, detection of surface type defects and printing type defects is achieved, and the method has the advantages of being small in occupied space, low in cost and high in multi-scene adaptability.

Description

Technical Field

[0001] The utility model relates to the technical field of printing product quality detection, and more specifically, to a multi-mode detection device. Background Art

[0002] In the global printing industry, China's printing industry has first-class design levels and high-quality printing services. Exquisite designs (such as gilding, laser, etc.), complex processes, and strict quality requirements bring huge challenges to the production of printing factories. At the same time, users' requirements for printing quality are getting higher and higher, so the printing factories' requirements for printing quality detection are constantly increasing. It has become increasingly important to improve the detection ability of printing products and optimize the detection methods.

[0003] Traditional printing product quality detection is mainly divided into surface defect detection and printing defect detection. Among them, surface defects include scratches, unevenness, displacement, etc. Such defects are usually detected by the following method: irradiating the product with incident light and using a surface detector to receive the reflected light to obtain an image containing surface information, processing the obtained image, and finally detecting the defects therein; printing defects include color difference, missing printing, knife wire, etc. Such defects are usually detected by the following method: irradiating the product surface with diffused light and using a detector to receive the diffused light information to obtain an image containing printing information, processing the obtained image, and finally detecting the defects therein. Since the image information acquisition methods for the two types of defects are different, and the detection methods used are also different, it is difficult for a detection device for one type of defect to be compatible with multiple defect types and cannot meet multi-scenario applications. When detecting traditional printed products, usually two sets of detection devices are used simultaneously, and the two sets of detection devices are used to judge the quality of surface defects and printing defects respectively. However, this detection mode requires a large amount of space and a high investment cost. Summary of the Utility Model

[0004] The purpose of the utility model is to combine two light sources for detecting different types of defects into an integrated light source, use the detection device composed of the integrated light source to realize the detection of two types of defects, namely surface type and printing type, and achieve different detection effects by adjusting the brightness ratio of different light sources, including changing the contrast of defects in the collected image, making the image background more uniform, simplifying the detection device, and more simply realizing the real-time detection and defect classification of printing products.

[0005] The technical solution of the utility model is to provide a multi-mode detection device, which includes: a first illumination light source, a second illumination light source, and an acquisition system;

[0006] The second lighting source includes a tunnel-shaped diffuser plate and lamp beads. The light emitted by the lamp beads is reflected by the tunnel-shaped diffuser plate to the detection area below the second lighting source. Light inlet ports and light outlet ports are symmetrically arranged on both sides of the tunnel-shaped diffuser plate. The first lighting source is arranged on the light inlet ports, and the light emitted by it irradiates the detection area below the second lighting source through the light inlet ports. The acquisition system is arranged outside the second lighting source and is used to acquire an image of the target product in the detection area through the light outlet ports.

[0007] Further, the second lighting source is arranged directly above the conveying device. The central axis of the tunnel-shaped diffuser plate is perpendicular to the upper surface of the conveying device. The two side edges of the second lighting source are close to the conveying device, and the distances from the two edges to the upper surface of the conveying device are equal.

[0008] Further, the detection area is located at the central position directly below the second lighting source. The center of the detection area is located on the center line of the conveying device. The detection area is used to place the target product.

[0009] Further, the angle between the line where the center of the light inlet port and the center of the detection area are located and the horizontal direction is 30° to 50°. The angle between the line where the center of the light outlet port and the center of the detection area are located and the horizontal direction is 30° to 50°. The center of the light inlet port and the center of the light outlet port are symmetric about the normal line of the central position of the detection area.

[0010] Further, the lamp beads are arranged at positions close to the edge inside the tunnel-shaped diffuser plate, and the light-emitting ends of the lamp beads face the inside of the tunnel-shaped diffuser plate.

[0011] Further, the multi-mode detection device further includes a reflecting mirror. The reflecting mirror is arranged outside the light outlet port and is located on the reflection path of the light of the first lighting source after irradiating the target product. The reflecting mirror is used to collect the light emitted from the light outlet port through the mirror surface and reflect the emitted light to the acquisition system.

[0012] Further, the first lighting source includes a planar diffuser plate and an internal light source. The planar diffuser plate is arranged parallel to the internal light source, and the light of the internal light source is diffused by the planar diffuser plate and then irradiates the target product in the detection area.

[0013] The beneficial effects of the utility model are:

[0014] First, the technical solution in this application combines a planar light source and a tunnel-shaped diffused light source into an integrated light source, and different detection effects are achieved by adjusting the brightness ratio of the two light sources, including adjusting the contrast of defects in the collected images to make the image background more uniform. Different types of defects have different requirements for light sources during the detection process. In the prior art, different detection devices are often used to detect surface defects and printing defects of products respectively. This detection mode involves multiple sets of detection devices, with high input costs and a relatively cumbersome process. However, the detection device in this application can simultaneously detect two types of defects. During detection, one type of defect can be highlighted by adjusting the brightness ratio of the two light sources, or both surface and printing defects can be highlighted simultaneously to complete the detection of one type of defect or two types of defects. Due to the different reflection characteristics of different products, the detection of various types of products can also be adapted by adjusting the brightness ratio of the two light sources, such as adapting to paper products and high-intensity laser products.

[0015] Compared with the devices in the prior art, the technical solution in this application can not only adapt to the detection of various defects but also detect various types of products, with high integration, low input costs, and the characteristics of multiple functions, and a wider application range.

[0016] Second, a reflector is provided in the technical solution of this application on the basis of the integrated light source and the acquisition system. The reflector can reflect the reflected light of the target product to the acquisition system, and the position of the acquisition system can be adjusted by rotating the reflector, avoiding the situation where the detection device of this application cannot be installed due to insufficient space, being able to adapt to various detection scenarios and occupying a small space. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and / or additional advantages of the present utility model will become apparent and be easily understood in the description of the embodiments in conjunction with the following drawings, where:

[0018] Figure 1 is a schematic diagram of the overall structure of a multi-mode detection device according to an embodiment of this application;

[0019] Figure 2 is a schematic diagram of the structure of the second illumination light source according to an embodiment of this application;

[0020] Figure 3 is a side view of the light-emitting surface of the first illumination light source according to an embodiment of this application;

[0021] Figure 4 is a top view of the light-emitting surface of the first illumination light source according to an embodiment of this application;

[0022] Among them, 1 - the first lighting source, 11 - a planar diffuser, 12 - an internal light source, 2 - the second lighting source, 21 - a tunnel-shaped diffuser, 22 - a lamp bead, 23 - a light inlet, 24 - a light outlet, 3 - an acquisition system, 4 - a reflector, 5 - a target product. Detailed implementation mode

[0023] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific implementation modes. It should be noted that, without conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0024] In the following description, many specific details are set forth in order to fully understand the present invention. However, the present invention can also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited by the specific embodiments disclosed below.

[0025] As Figure 1 shown, this embodiment provides a detection device based on a multi-functional integrated light source. The detection device is arranged on a conveying device and is used for collecting defect images of the target product 5, and includes a first lighting source 1, a second lighting source 2, and an acquisition system 3.

[0026] As Figure 1 shown, this embodiment provides a detection device based on a multi-functional integrated light source. The detection device is arranged on a conveying device and is used for collecting defect images of the target product 5, and includes a first lighting source 1, a second lighting source 2, an acquisition system 3 and a reflector 4.

[0027] The second lighting source 2 includes a tunnel-shaped diffuser 21 and a lamp bead 22. The lamp bead 22 is arranged at a position close to the edge inside the tunnel-shaped diffuser 21, and its light-emitting end faces the inside of the tunnel-shaped diffuser 21. The light emitted by the lamp bead 22 is reflected by the tunnel-shaped diffuser 21 to the detection area at the center directly below the second lighting source 2.

[0028] The second lighting source 2 is arranged directly above the conveying device. The central axis of its tunnel-shaped diffuser plate 21 (referring to the center line or axis of this structure) is perpendicular to the upper surface of the conveying device (the conveying device is the device used for transporting products). The parts at both side edges are equally spaced and close to the conveying device. The central position directly below the second lighting source 2 is the detection area, and the detection area is used to place the target product. Among them, the center of the detection area is located on the center line of the conveying device. The light-emitting end of the lamp bead 22 faces vertically towards the inner side of the tunnel-shaped diffuser plate 21, and the light emitted by it is reflected by the tunnel-shaped diffuser plate 21 and then irradiates the target product in the detection area. In this embodiment, the second lighting source 2 is a tunnel light source, which is a multi-angle diffused light source (multi-angle means that the light source has multiple irradiation angles on the target product 5), and is used to provide diffused light for the target product 5.

[0029] Light inlet 23 and light outlet 24 are symmetrically arranged on both sides of the tunnel-shaped diffuser plate 21. The included angle range between the straight line where the center of the light inlet 23 and the center of the detection area are located and the horizontal direction is 30° to 50°. The included angle range between the straight line where the center of the light outlet 24 and the center of the detection area are located and the horizontal direction is also 30° to 50°. When setting the two light ports, the center of the light inlet 23 and the center of the light outlet 24 are symmetrical about the normal line of the center position of the detection area. Since the tunnel-shaped diffuser plate 21 is an axisymmetric arc-shaped device, its central axis is the axis of symmetry, as Figure 2 shown. Also, since the detection area is located directly below the second lighting source 2 and the center of the detection area is located on the center line of the conveying device, the normal line of the center position of the detection area coincides with the central axis of the tunnel-shaped diffuser plate 21.

[0030] The first lighting source 1 is arranged on the light inlet 23. The light of the first lighting source 1 irradiates the detection area directly below the second lighting source 2 through the light inlet 23. The acquisition system 3 is arranged outside the light outlet 24. The acquisition system 3 is located on the reflection path of the light of the first lighting source 1 after irradiating the target product, and is used to receive the light emitted from the light outlet 24 and acquire the image of the target product.

[0031] As Figures 3 to 4As shown in the figure, the first illumination light source 1 includes a planar diffuser 11 and an internal light source 12. The planar diffuser 11 is arranged parallel to the internal light source 12. The light of the internal light source 12 is diffused by the planar diffuser 11 and then irradiates the target product in the detection area. Among them, the angle between the light incident from the light inlet 23 and the normal line at the center position of the detection area is 30° to 50°, and the angle between the light emitted from the light outlet 24 and the normal line at the center position of the detection area is 30° to 50°. In this embodiment, the first illumination light source 1 is a surface light source, which is used to provide uniform surface light for the target product 5. The internal light source 12 can be selected from a broadband surface light source or a converging light source, etc. Among them, the broadband surface light source can be a row of lamp beads (i.e., a narrow light source) or multiple rows of lamp beads. Taking a broadband surface light source with four rows of lamp beads as an example, its light-emitting surface is wider than that of a traditional strip light source. The diffuser is used to diffuse the light emitted by the lamp beads, so that after the detection target product 5 is irradiated by the first illumination light source 1, the imaging obtained by the acquisition system 3 is more uniform. Figure 3 This is a side view of the light-emitting surface of the light source. Figure 4 This is a top view of the light-emitting surface of the light source.

[0032] In this embodiment, a surface light source is used as the first illumination light source 1. Its illumination range is relatively concentrated and the illumination effect is relatively uniform. When the incident light irradiates the target product 5 and there are deformation defects (including scratches, concavities and convexities, wrinkles) on the product surface, the reflection angle of the light changes, resulting in different light energies entering the acquisition system 3, and the defective part produces a bright or dark effect. Using a tunnel light source as the second illumination light source 2, the uniformity of the diffused light generated by it is better, which can effectively eliminate the influence of the product surface deformation on the imaging, making the imaging of the acquisition system 3 more uniform. After irradiating the target product 5, the diffused light is reflected by the mirror 4 and enters the acquisition system 3, and the printing defects in the collected image are clearer. For example, when using a tunnel light source to irradiate a high-intensity laser product for image acquisition, the imaging of the high-intensity laser product is more uniform, which helps to detect printing defects.

[0033] In this embodiment, compared with traditional light sources, the second illumination light source 2 is provided with a light inlet 23 and a light outlet 24. The light inlet 23 is used as a passage for the light emitted by the first illumination light source 1, and the light outlet 24 is used as a passage for the light reflected by the target product 5. The angle between the incident light generated by the first illumination light source 1 and the normal line (the normal line refers to the normal line of the plane of the target product 5 in the detection area or the normal line of the detection area plane) is 30° to 50°, and the angle between the reflected light formed after the incident light is reflected by the target product 5 and the normal line is 30° to 50°. The design of the light inlet 23 and the light outlet 24 combines the surface light source and the tunnel light source into an integrated light source, and also reserves space for the acquisition system 3 to acquire images. Moreover, the first illumination light source 1 and the second illumination light source 2 are independent controllable individuals that can emit light independently. During use, their brightness can be adjusted. When the brightness ratios of the two light sources are different, the imaging of the acquisition system 3 is also different. The surface light source focuses on reflecting the surface defects of the target product 5, and the tunnel light source focuses on reflecting the printing defects of the target product 5. Therefore, different detection results can be obtained by adjusting the intensities of the two light sources, and this integrated light source has the characteristic of multi-functionality. In this embodiment, the lamp beads of all light sources are white LEDs.

[0034] The detection device based on the multi-functional integrated light source further includes a reflector 4. The reflector 4 is arranged outside the light outlet 24, and its mirror surface can collect the light emitted from the light outlet 24 and reflect the emitted light to the acquisition system 3. The acquisition system 3 is used to acquire images of the target product 5. In this embodiment, the acquisition system 3 is composed of a high-resolution black-and-white or color line array camera combined with a high-magnification fixed-focus lens. The configuration of this acquisition system 3 is a high-precision and high-speed optical path design, which can complete high-precision image acquisition for the surface of printed products.

[0035] In this embodiment, a reflector 4 can be selected for the integrated light source formed by the first illumination light source 1 and the second illumination light source 2. As an adjustment system for the light emitted from the light outlet 24, during use, the acquisition angle and acquisition position of the acquisition system 3 can be adjusted by rotating the reflector 4, making the debugging of the acquisition system 3 more flexible and with higher adaptability.

[0036] In this embodiment, the width of the light input port 23 can be set to 10 mm to 40 mm, and the width of the light output port 24 can be set to 10 mm to 30 mm. The light input port 23 is located on the incident path of the light emitted by the first illumination source 1. In order for the acquisition system 3 to collect the reflected light generated by the light of the first illumination source 1 on the target product 5 and facilitate the acquisition system 3 to perform image acquisition, the light output port 24 needs to be set on the reflection path of the light emitted by the first illumination source 1 after passing through the target product 5. Therefore, the centers of the light input port 23 and the light output port 24 should be symmetric about the central axis of the second illumination source 2. During the detection process, the target product 5 moves at high speed from the initial end to the terminal end of the conveying device. When it moves to the detection area directly below the second illumination source 2, the acquisition system 3 performs image acquisition.

[0037] The detection device in this embodiment integrates two types of illumination sources. Therefore, when detecting different target products or different defects of the same type of target product, it is necessary to adjust the brightness ratio of the two light sources to achieve different detection effects.

[0038] The working principle of the multi-mode detection device in this embodiment is as follows:

[0039] The second illumination source 2 is arranged directly above the conveying device so that its central axis is perpendicularly intersected with the central line of the conveying device. The central position directly below the second illumination source 2 is used as the detection area. The first illumination source 1 is arranged outside the light input port 23 of the second illumination source 2 so that the light emitted by the second illumination source 2 irradiates the detection area. A reflector 4 is arranged outside the light output port 24 of the second illumination source 2, and its position is adjusted so that its mirror surface can collect the light emitted from the light output port 24. The acquisition system 3 is arranged on the path of the light emitted from the light output port 24 after being reflected by the reflector 4. The target products 5 are placed at equal intervals at the central position of the conveying device, and the conveying device drives the target products 5 to move through the detection area.

[0040] When detecting surface defects of the target product 5, the brightness ratio of the first illumination source 1 to the second illumination source 2 is adjusted to enable the imaging of the acquisition system 3 to clearly reflect the range of surface defects of the target product 5. After the target product 5 moves to the detection area, the light of the first illumination source 1 and the second illumination source 2 irradiates the surface of the target product 5. Part of the reflected light on the surface of the target product 5 exits from the light output port 24, is reflected by the reflector 4, and then enters the acquisition system 3. The acquisition system 3 performs image acquisition, obtains the image of the surface of the target product 5, and uploads the image to the host computer, and the host computer performs subsequent processing on the captured image.

[0041] When detecting the printing defects of the target product, adjust the brightness ratio of the first lighting source 1 to the second lighting source 2 so that the imaging of the acquisition system 3 can clearly reflect the range of the printing defects of the target product 5. After the target product 5 moves to the detection area, the light rays of the first lighting source 1 and the second lighting source 2 irradiate the surface of the target product 5. Part of the reflected light on the surface of the target product 5 exits from the light outlet 24, is reflected by the reflector 4, and then enters the acquisition system 3. The acquisition system 3 performs image acquisition to obtain an image of the surface of the target product 5, and uploads the image to the host computer, and the host computer performs subsequent processing on the captured image.

[0042] When detecting the surface defects and printing defects of the target product simultaneously, adjust the brightness ratio of the first lighting source 1 to the second lighting source 2 so that the imaging of the acquisition system 3 can simultaneously reflect the ranges of the surface defects and printing defects of the target product 5. After the target product 5 moves to the detection area, the light rays of the first lighting source 1 and the second lighting source 2 irradiate the surface of the target product 5. Part of the reflected light on the surface of the target product 5 exits from the light outlet 24, is reflected by the reflector 4, and then enters the acquisition system 3. The acquisition system 3 performs image acquisition to obtain an image of the surface of the target product 5, and uploads the image to the host computer, and the host computer performs subsequent processing on the captured image.

[0043] In this embodiment, due to the different surface materials and printing materials used for different products, the reflection characteristics are different, and the range of the brightness ratio used for detection is different. Therefore, before detection, it is necessary to adjust the brightness ratio of the first lighting source 1 to the second lighting source 2 to an appropriate range according to the imaging situation of the acquisition system 3.

[0044] Example 1, taking the detection of the surface defects and printing defects of product A (taking the drug packaging as product A) as an example, where the brightness range of the first lighting source 1 to the second lighting source 2 is from 0 to 100, and the specific acquisition method is as follows:

[0045] Acquisition method 1: Adjust the brightness ratio of the first lighting source 1 to the second lighting source 2 to 100:0 (that is, only use the first lighting source 1 to irradiate product A). At the position of the surface wrinkle defect of product A, the surface deformation defect in the image collected by the acquisition system 3 is clearly visible, showing as an oblique long shadow, while the printing information (including text and graphics) is interfered by the deformed part and cannot be clearly presented. It can be seen that at this brightness ratio, the surface defects of product A can be detected.

[0046] In this example, through acquisition method 1, images of scratches, bumps or wrinkles on the product surface can be obtained, which is suitable for the detection of products with many surface defects.

[0047] Collection method 2: Adjust the brightness ratio of the first illumination source 1 to the second illumination source 2 to 0:100 (i.e., only use the second illumination source 2 to irradiate product A). In the image collected by the acquisition system 3, the overall imaging of the product is uniform, the background is soft, the printed information is clearly visible, while the surface deformation defect within the red frame is blurred and cannot be clearly presented. It can be seen that at this brightness ratio, the printing defects of product A can be detected.

[0048] In this example, through collection method 2, an imaging of a printed product with a uniform background can be obtained, which is suitable for the detection of products with printed information defects and products with strong light column lasers. Under the illumination of the second illumination source 2, it will not be impossible to detect the printed information defects due to the high reflection light intensity of the product with a strong light column laser.

[0049] Collection method 3: Adjust the brightness ratio of the first illumination source 1 to the second illumination source 2 to 100:100 (i.e., only use the first illumination source 1 and the second illumination source 2 to irradiate product A together). In the image collected by the acquisition system 3, both the surface deformation and the printed information can be presented simultaneously. The characteristic form of the surface deformation defect is obvious, and at the same time, the imaging of the product is relatively uniform and the printed information imaging is clear. It can be seen that at this brightness ratio, the detection of both surface defects and printing defects can be taken into account. In this example, within the brightness ratio range where both types of defects are presented simultaneously, the brightness ratio of the first illumination source 1 to the second illumination source 2 can be appropriately adjusted to make one type of defect clearer, so as to obtain a more accurate detection result.

[0050] In this example, through collection method 3, that is, the first illumination source 1 and the second illumination source 2 illuminate simultaneously, an imaging of a printed product with a relatively uniform background can be obtained, and at the same time, defect images with obvious surface defects (scratches, concavities and convexities, wrinkles) can be obtained, taking into account the imaging detection of both surface defects and printing defects.

[0051] Example 2: Taking the detection of surface defects of product B as an example, it is as follows:

[0052] (1) Adjust the brightness ratio of the first illumination source 1 to the second illumination source 2 to 0:100. At the position of the surface defect, the defect is not visible in the image collected by the acquisition system 3.

[0053] (2) Adjust the brightness ratio of the first illumination source 1 to the second illumination source 2 to 15:100. The defect is visible in the image collected by the acquisition system 3, the overall background of the image is relatively uniform, and the defect contrast is 12 DN (Digital Number, which is the standard unit representing the pixel brightness value in digital image processing. In this example, the defect contrast can be detected using the image processing and analysis software in the upper computer).

[0054] (3) Adjust the brightness ratio of the first illumination source 1 to the second illumination source 2 to 30:100. In the image collected by the acquisition system 3, the defect is visible, the overall background noise of the image is relatively obvious, and the defect contrast is 24 DN.

[0055] (4) Adjust the brightness ratio of the first illumination source 1 to the second illumination source 2 to 100:0. In the image collected by the acquisition system 3, the defect is visible, the overall background noise interference of the image is serious, and the defect contrast is 35 DN.

[0056] In this example, when the first illumination source 1 illuminates alone, the background noise of the image of product B is serious and cannot be detected; when the second illumination source 2 illuminates alone, the defect of the product image is invisible and cannot be detected either; when the brightness ratio of the first illumination source 1 to the second illumination source 2 is 15:100 - 30:100, the defect is clearly visible and the background is uniform, and the detection effect is better than that when using a single light source for illumination.

[0057] It can be seen from the above two examples that the multi-mode detection device in the present utility model can change the defect contrast and the uniformity of the image background by adjusting the brightness ratio of the first illumination source 1 and the second illumination source 2. Based on this feature, the detection device can give a suitable brightness ratio for different products and has a wider adaptability to scenarios.

[0058] During the detection process of most printed products, it is required to have a low detection cost, save space, and at the same time require a large number of detectable defect types. The detection device in the present utility model integrates two types of light sources and can provide three acquisition methods: 1. Use the first illumination source 1 alone to irradiate the product and collect the image; 2. Use the second illumination source 2 alone to irradiate the product and collect the image; 3. Use the first illumination source 1 and the second illumination source 2 simultaneously to irradiate the product and collect the image. It realizes: 1. Separate detection of surface defects; 2. Separate detection of printing defects (including laser products); 3. Simultaneous detection of surface defects and printing defects; 4. Adjust the contrast and detection effect of defects with different light source brightness ratios. The detection device in the present utility model can realize imaging detection with multiple functions. Compared with the method of using different devices to detect different types of defects in traditional detection, the detection device and method in the present utility model greatly reduce the cost, save space, and have a higher adaptability to different scenarios.

[0059] In the present utility model, terms such as "installation", "connection", "linkage", "fixation" should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; "linkage" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0060] The shapes of the various components in the drawings are all schematic, and there is no exclusion of a certain difference from their true shapes. The drawings are only used to illustrate the principle of the present utility model and are not intended to limit the present utility model.

[0061] Although the present utility model has been disclosed in detail with reference to the drawings, it should be understood that these descriptions are merely exemplary and are not used to limit the application of the present utility model. The protection scope of the present utility model is defined by the appended claims and may include various modifications, adaptations and equivalent solutions made to the utility model without departing from the protection scope and spirit of the present utility model.

Claims

1. A multi-mode detection device, characterized in that: The multi-mode detection device comprises: a first illumination light source (1), a second illumination light source (2) and a collection system (3); The second illumination light source (2) comprises a tunnel-shaped diffusion plate (21) and lamp beads (22); the light emitted by the lamp beads (22) is reflected by the tunnel-shaped diffusion plate (21) to a detection area below the second illumination light source (2); a light inlet (23) and a light outlet (24) are symmetrically arranged on both sides of the tunnel-shaped diffusion plate (21); the first illumination light source (1) is arranged on the light inlet (23); the light emitted by the first illumination light source (1) is emitted through the light inlet (23) to the detection area below the second illumination light source (2); the acquisition system (3) is arranged outside the second illumination light source (2); and the acquisition system (3) is used to acquire an image of a target product in the detection area through the light outlet (24).

2. The multi-mode detection device according to claim 1, characterized in that: The second illumination light source (2) is arranged directly above the conveying device, the central axis of the tunnel-shaped diffusion plate (21) is perpendicular to the upper surface of the conveying device, the two side edges of the second illumination light source (2) are close to the conveying device, and the distances between the two edges and the upper surface of the conveying device are equal.

3. The multi-mode detection device according to claim 2, characterized in that: The detection area is located at a central position directly below the second illumination light source (2), the center of the detection area is located on the central line of the conveying device, and the detection area is used to place the target product.

4. The multi-mode detection device according to claim 3, characterized in that: The angle between the center of the light inlet (23) and the straight line where the center of the detection area is located and the horizontal direction is 30° to 50°, the angle between the center of the light outlet (24) and the straight line where the center of the detection area is located and the horizontal direction is 30° to 50°, and the center of the light inlet (23) and the center of the light outlet (24) are symmetrical about the normal line of the center position of the detection area.

5. The multi-mode detection device according to claim 1, characterized in that: The lamp beads (22) are arranged on the inner side of the tunnel-shaped diffusion plate (21) close to the edge thereof, and the light-emitting ends of the lamp beads (22) face the interior of the tunnel-shaped diffusion plate (21).

6. The multi-mode detection device according to claim 1, characterized in that: The multi-mode detection device further comprises a reflector (4), wherein the reflector (4) is arranged outside the light outlet (24), and the reflector (4) is located on a reflection path after the light of the first illumination light source (1) irradiates the target product, and the reflector (4) is used to collect the light emitted from the light outlet (24) through a mirror surface, and reflect the emitted light to the collection system (3).

7. The multi-mode detection device according to claim 1, characterized in that: The first illumination light source (1) comprises a planar diffuser (11) and an internal light source (12); the planar diffuser (11) and the internal light source (12) are arranged in parallel; light from the internal light source (12) is diffused by the planar diffuser (11) and then irradiated onto a target product in a detection area.

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