Printed matter visual inspection light source system

Abstract

The utility model discloses a kind of printed matter visual inspection light source systems, including support frame, mounting seat is equipped in the support frame inside, pressure roller is set in the mounting seat lower part, back strip light source is equipped in the pressure roller below, tunnel light source is equipped in the pressure roller above, prism is equipped in the tunnel light source above, front strip light source is equipped in the prism above, camera module is equipped in the front strip light source above;First heat dissipation device, second heat dissipation device, third heat dissipation device, fourth heat dissipation device are further equipped.Its advantage is: without replacing dismounting installation light source device, through the light source brightness of adjusting combination light source to adapt to different materials, meet the requirement of imaging standard.Compatible ordinary, single, double, gold stamping and radium material and gold stamping material, substantially reduce the defect false alarm risk caused by light source and product incompatibility. Base paper, material, background contrast is higher, reduce the difficulty of algorithm distinguishing image edge.

Description

Technical Field

[0001] This utility model relates to the field of visual inspection technology for printed materials, and in particular to a light source system for visual inspection of printed materials. Background Technology

[0002] In the printing industry, light sources are needed to detect and image printing quality defects and die-cutting defects. Traditional light sources suffer from low contrast or significant contrast differences when imaging transparent, one-way, two-way, ordinary, and special processes like hot stamping and laser printing materials. Some imaging areas are too dark, while others are overexposed, posing significant challenges to software post-processing and making it difficult for software algorithms to reliably identify defects with low contrast. For self-adhesive label printing materials, low contrast increases the difficulty for software algorithms to distinguish between the backing paper and label face paper, affecting the system's performance in detecting die-cutting defects.

[0003] To address the aforementioned technical challenges, current lighting methods typically employ one of several light sources—such as strip lights, large-area lights, or dome lights—for frontal imaging. For transparent materials, an additional strip light is used on the back to supplement the front light. Switching between large-area and tunnel light sources requires workers to modify the light source modules, replacing them with tunnel light modules to meet the lighting needs of different printed defect detection methods, depending on the material and manufacturing process. The more frequently print orders are changed, the more frequent these switching operations become, resulting in low efficiency, substandard detection accuracy, and an inability to achieve full coverage of requirements.

[0004] Therefore, for different printing materials and manufacturing processes, such as hot stamping, laser engraving, lamination, and varnishing, it is necessary to develop combined lighting sources during the visual inspection process. By adjusting the angle and brightness ratio of the combined light sources, various printing defects can be displayed uniformly and clearly, reducing the processing difficulty of software algorithms, improving the system's defect detection capabilities, enhancing the system's intelligence, and reducing the difficulty of use for users. Utility Model Content

[0005] The purpose of this invention is to overcome the above-mentioned technical defects and propose a visual inspection light source system for printed materials. By adjusting the angle and brightness ratio of the combined light source, various defects in printed materials can be displayed uniformly and clearly, reducing the processing difficulty of software algorithms, improving the system's defect detection capability, enhancing the system's intelligence, and reducing the difficulty of use for users.

[0006] The technical solution adopted by this utility model to solve its technical problem is: a visual inspection light source system for printed matter, including a support frame, a mounting seat provided on the inner side of the support frame, a pressure roller provided at the lower part of the mounting seat, a back strip light source provided below the pressure roller, a tunnel light source provided above the pressure roller, a prism provided above the tunnel light source, a front strip light source provided above the prism, and a camera module provided above the front strip light source. The camera module is mounted on the support frame by a support rod. A first heat dissipation device is provided on the outer wall of the tunnel light source, a second heat dissipation device is provided on the outer wall of the front strip light source, a third heat dissipation device is provided on the top of the camera module, and a fourth heat dissipation device is provided on the upper part of the support frame. The rear strip light source, tunnel light source, front strip light source, camera module, first heat dissipation device, second heat dissipation device, third heat dissipation device, and fourth heat dissipation device are all electrically connected to an external power source via wires.

[0007] Preferably, one end of the support rod is fixed to the side wall of the support frame, and the other end extends toward the center of the support frame, with the camera module mounted on the extended end of the support rod.

[0008] Preferably, the first heat dissipation device, the second heat dissipation device, the third heat dissipation device, and the fourth heat dissipation device are all cooling fans.

[0009] Preferably, the rear strip light source is located slightly to the right below the tunnel light source, and the axial distance between the two is 15mm.

[0010] Preferably, the front strip light source is located slightly to the right above the tunnel light source, and the angle between the axis of the front strip light source and the horizontal plane is 77°.

[0011] Preferably, the mounting base includes two sets, symmetrically arranged on the left and right sides of the support frame, and a connecting rod is also provided between the mounting bases.

[0012] The beneficial effects of this utility model are: 1. Strong technical applicability: No need to replace, disassemble or install the light source device. By adjusting the brightness of different light sources in the combination, it can adapt to different materials and meet the requirements of imaging standards.

[0013] 2. Compatible with multiple materials: Compatible with ordinary, one-way, two-way, hot stamping, laser and hot stamping materials, greatly reducing the risk of false alarms due to incompatibility between light source and product.

[0014] 3. High imaging contrast: The contrast between the base paper, material, and background is high, which reduces the difficulty for the algorithm to distinguish image edges. Attached Figure Description

[0015] Figure 1This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a three-dimensional structural diagram of the present invention; Figure 3 This is a schematic diagram of the light source device.

[0016] The diagram is marked as follows: 1. Support frame; 2. Mounting base; 3. Pressure roller; 4. Rear strip light source; 5. Tunnel light source; 6. Prism; 7. Front strip light source; 8. Camera module; 9. Support rod; 10. First heat dissipation device; 11. Second heat dissipation device; 12. Third heat dissipation device; 13. Fourth heat dissipation device; 14. Connecting rod; 15. Printed material. Detailed Implementation

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments. Example

[0018] like Figure 1-3 As shown: A visual inspection light source system for printed materials includes a support frame 1, a mounting base 2 inside the support frame 1, a pressure roller 3 below the mounting base 2, a back strip light source 4 below the pressure roller 3, a tunnel light source 5 above the pressure roller 3, a prism 6 above the tunnel light source 5, a front strip light source 7 above the prism 6, and a camera module 8 above the front strip light source 7. The camera module 8 is mounted on the support frame 1 via a support rod 9. A first heat dissipation device 10 is provided on the outer wall of the tunnel light source 5, a second heat dissipation device 11 is provided on the outer wall of the front strip light source 7, a third heat dissipation device 12 is provided on the top of the camera module 8, and a fourth heat dissipation device 13 is provided on the upper part of the support frame 1. The rear strip light source 4, tunnel light source 5, front strip light source 7, camera module 8, first heat dissipation device 10, second heat dissipation device 11, third heat dissipation device 12, and fourth heat dissipation device 13 are all electrically connected to an external power source via wires.

[0019] One end of the support rod 9 is fixed to the side wall of the support frame 1, and the other end extends toward the center of the support frame 1. The camera module 8 is installed at the extended end of the support rod 9.

[0020] The first heat dissipation device 10, the second heat dissipation device 11, the third heat dissipation device 12, and the fourth heat dissipation device 13 are all cooling fans.

[0021] The rear strip light source 4 is located slightly to the right below the tunnel light source 5, and the axial distance between the two is 15mm.

[0022] The front bar light source 7 is located slightly to the right above the tunnel light source 5, and the angle between the axis of the front bar light source 7 and the horizontal plane is 77°.

[0023] The mounting base 2 includes two sets, symmetrically arranged on the left and right sides of the support frame 1, and a connecting rod 14 is also provided between the mounting bases 2.

[0024] The working principle and process of this utility model are as follows: The back bar light source 4, tunnel light source 5, front bar light source 7, prism 6, etc. are installed on the printing equipment in the manner described above. When the printed matter 15 passes by, different light sources are selected to adjust the imaging according to the characteristics of different printed matter materials, thereby improving the contrast between normal and defective parts of the printed matter.

[0025] (1) Based on the characteristics of different materials: different light sources are used. For example, for highly reflective materials such as laser material and hot stamping material, tunnel light source 5 is used more often, and other light sources are used less often. Conversely, for diffuse reflective materials, back strip light source 4 or front strip light source 7 is used more often, and tunnel light source 5 is used less often. The material difference between one-way and two-way reflective materials and the backing paper also requires different light source ratios to adjust the imaging and improve the contrast.

[0026] (2) Does not follow the conventional law of reflection: The conventional law of reflection is specular reflection. This light source system achieves imaging by adjusting the light source, camera and other devices, thereby enabling high-contrast imaging between the backing paper and the label, greatly reducing the difficulty of algorithm differentiation.

Claims

1. A visual inspection light source system for printed materials, including a support frame, characterized in that: A mounting base is provided inside the support frame, a pressure roller is provided below the mounting base, a back strip light source is provided below the pressure roller, a tunnel light source is provided above the pressure roller, a prism is provided above the tunnel light source, a front strip light source is provided above the prism, and a camera module is provided above the front strip light source. The camera module is mounted on the support frame by a support rod. A first heat dissipation device is provided on the outer wall of the tunnel light source, a second heat dissipation device is provided on the outer wall of the front strip light source, a third heat dissipation device is provided on the top of the camera module, and a fourth heat dissipation device is provided on the upper part of the support frame. The rear strip light source, tunnel light source, front strip light source, camera module, first heat dissipation device, second heat dissipation device, third heat dissipation device, and fourth heat dissipation device are all electrically connected to an external power source via wires.

2. The visual inspection light source system for printed matter according to claim 1, characterized in that: One end of the support rod is fixed to the side wall of the support frame, and the other end extends toward the center of the support frame. The camera module is installed at the extended end of the support rod.

3. The visual inspection light source system for printed matter according to claim 1, characterized in that: The first, second, third, and fourth heat dissipation devices are all cooling fans.

4. The visual inspection light source system for printed matter according to claim 1, characterized in that: The rear strip light source is located slightly to the right below the tunnel light source, and the axial distance between the two is 15mm.

5. The visual inspection light source system for printed matter according to claim 1, characterized in that: The front bar light source is located slightly to the right above the tunnel light source, and the angle between the axis of the front bar light source and the horizontal plane is 77°.

6. The visual inspection light source system for printed matter according to claim 1, characterized in that: The mounting base includes two sets, symmetrically arranged on the left and right sides of the support frame, and a connecting rod is also provided between the mounting bases.

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