Visual imaging system for detecting foreign matters in screen packaging

Abstract

The utility model provides a screen packaging foreign matter detection visual imaging system, which comprises more than two cameras and a light source, the light source is a light source plate, is arranged above a detection product plane and is parallel to the detection plane, the cameras are arranged above the light source, and the cameras are arranged above the light source. Through holes are formed in the positions, corresponding to the positions under the cameras, of the light source, and the cameras correspond to the through holes in a one-to-one mode. The system is simple in structure, low in cost, high in detection efficiency and high in accuracy.

Description

Technical Field

[0001] The utility model relates to the field of vision detection, in particular to a vision imaging system for detecting foreign matters in screen packaging. Background Technique

[0002] Screens are applied in many aspects of our lives, such as TV screens, Ipad screens, mobile phone screens, etc. With the improvement of people's living standards, customers' usage experience of screens has increased accordingly, so the quality requirements for screens are also higher. During the process of packing the screens in boxes after production, due to the influence of factors such as the on-site environment or human participation, foreign matters may fall into the packing boxes, and the foam used for partitioning between the screens may warp or curl. These will all affect the subsequent stacking of the screens layer by layer, and seriously, it is easy to cause problems such as damage, deformation, and cracking of the screens. Generally, foreign matters include relatively easy-to-find screws, gaskets, plastic parts, etc., and also include small and hard-to-find transparent desiccant particles, etc. Usually, before the screen is put into the packing box, people check whether there are foreign matters in the box by eyes, with limited work efficiency and easy to miss inspections, especially for foreign matters such as transparent desiccants, which are very difficult to detect in time. Content of the Utility Model

[0003] In view of the above, the utility model provides a vision imaging system for detecting foreign matters in screen packaging, which has a simple structure, low cost, high detection efficiency, and high accuracy.

[0004] The utility model adopts the following technical scheme: a vision imaging system for detecting foreign matters in screen packaging, including a camera and a light source. The number of the cameras is set to be more than two. The light source is a light source board, which is arranged above the detection product plane and parallel to the detection plane. The camera is arranged above the light source, and through holes are opened at positions corresponding to the positions directly below the cameras on the light source, and the cameras and the through holes correspond one by one.

[0005] Further, the diameter size of the through hole is larger than the lens size of the camera.

[0006] Further, the distance between the camera and the detection plane is 600 - 800 mm.

[0007] Further, the distance between the camera and the detection plane is larger than the distance between the light source and the detection plane.

[0008] Further, the camera is a area array camera.

[0009] Further, four cameras are set.

[0010] The foreign object detection visual imaging system for screen packaging in this application sets multiple cameras, which can quickly detect whether there are foreign objects in the packaging box and on the screen at one time, reducing the labor intensity and avoiding omissions in human eye detection. It is equipped with a flat large-format backlight. The camera obtains the image of the detection surface below through the through hole on the light source. Such a design obtains a clearer image. Especially for transparent foreign objects such as desiccant particles, the open-hole backlight makes the image contrast higher, thus avoiding the omission of such hard-to-find foreign objects. Brief Description of the Drawings

[0011] Figure 1 It is a schematic diagram of the relationship among the single-station camera, light source and detection plane of the present utility model.

[0012] Figure 2 It is a schematic diagram of the relationship among the four-station camera, light source and detection plane of the present utility model.

[0013] Figure 3 It is a schematic diagram of the light source structure of the present utility model.

[0014] Figure 4 It is a schematic diagram of the relationship between the four-station camera field of view and the detection plane of the present utility model. Detailed Description of the Embodiment

[0015] The present utility model will be further described in detail below with reference to the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present utility model, rather than limiting the present utility model. In addition, it should be noted that for the convenience of description, only parts related to the present utility model are shown in the drawings, rather than all structures.

[0016] In the description of the present utility model, it should be noted that unless otherwise clearly specified and limited, terms such as "set" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0017] Refer to Figure 1 - Figure 2 , the foreign object detection visual imaging system for screen packaging in this embodiment includes a camera 1 and a light source 2. In this embodiment, the camera 1 refers to the area array camera itself and its supporting lens. The light source 2 is a light source board, that is, a flat backlight, which is arranged above the detection plane 3 to be detected and parallel to the detection plane 3. The camera 1 is arranged above the light source 2. A through hole 21 is opened at the position corresponding to the directly lower part of the camera 1 on the light source 2. The diameter size of the through hole 21 is 2-3 mm larger than the lens size of the camera 1 to avoid blocking the camera from obtaining an image.

[0018] More specifically, the cameras 1 and the through holes 21 correspond one by one. The number of cameras 1 is set to be more than two. Each camera 1 is independently controlled and can work alone or simultaneously. When multiple cameras work synchronously, there is an overlap in the camera fields of view, ensuring that there are no missing areas on the detection plane. At the same time, the camera field of view exceeds the outer edge of the product. For example, for the detection plane 3 with a size of 1555 mm * 800 mm, the single-station field of view of the camera is 800 mm * 585 mm. Preferably, four cameras 1 are set, and correspondingly, the through holes 21 on the light source board are also four. The combined field of view of the four cameras covers the detection plane 3, and a 22-mm edge area a1 is reserved around each side. The overlapping areas of the camera fields of view on the detection plane 3 are b1 = 25 mm and b2 = 163 mm respectively. During detection, the four cameras take pictures simultaneously, and then the image processing system automatically processes and analyzes them and stitches them together to ensure that the overall image of the detection plane 3 can be obtained in one photo. The coordinates (X, Y) are used to represent the opened through holes 21. Taking one corner of the light source board as the origin (0, 0), the coordinates of the four through holes 21 are c1(400, 292.5), c2(1175, 292.5), c3(400, 714.5), and c4(1175, 714.5) respectively.

[0019] In this embodiment, as the screens are stacked in the packing box, the height of the detection surface changes. The vertical distance d1 between the camera 1 and the detection plane 3 ranges from 600 to 800 mm. The vertical distance d1 between the camera 1 and the detection plane 3 is 30 mm greater than the vertical distance d2 between the light source 2 and the detection plane 3, ensuring that the camera can obtain clear images.

[0020] The screen packing foreign object detection vision imaging system of the present application is set to be used at the screen packing detection station. During online detection, the packing box at the detection station can be detected first, and it is photographed to detect whether there are missing components and whether there are foreign objects inside. If there is a foreign object, an alarm is given and the foreign object is taken away manually. If there is no foreign object, foam can be placed into the packing box. Then the camera will detect the placement direction and flatness of the foam. If there are situations such as warping or curling, an alarm is given and manual intervention is carried out. If not, the next step is to place the screen. After the screen is placed, it is detected to check whether there are foreign objects on the screen, etc. If there are foreign objects or other situations, an alarm is given and manual intervention is carried out. If not, continue to place the foam and detect. This process of repeated feeding and detection is carried out until the packing is completed. There are multiple steps of detection in this process. Using the detection imaging system of the present application can greatly improve the detection efficiency and detection effect and avoid losses of the screen during the packing process.

[0021] In addition, the above embodiments are only used to illustrate the present utility model and do not limit the technical solutions described in the present utility model. The understanding of this specification should be based on those skilled in the art. Although this specification has described the present utility model in detail with reference to the above embodiments, those of ordinary skill in the art should understand that those skilled in the art can still modify or make equivalent substitutions to the present utility model, and all technical solutions and their improvements that do not depart from the spirit and scope of the present utility model should be covered within the scope of the claims of the present utility model.

Claims

1. A screen packaging foreign body detection visual imaging system, including a camera and a light source, characterized in that: The number of cameras is set to be more than two, the light source is a flat-panel light source, which is arranged above the inspection product plane and parallel to the inspection plane, the camera is arranged above the light source, and a through hole is opened on the light source at a position corresponding to the position directly below the camera, and the camera and the through hole correspond one to one.

2. The screen packaging foreign body detection visual imaging system according to claim 1, characterized in that: The diameter of the through hole is larger than the lens size of the camera.

3. The screen packaging foreign body detection visual imaging system according to claim 1, characterized in that: The distance between the camera and the detection plane is 600-800 mm.

4. The screen packaging foreign body detection visual imaging system according to claim 3, characterized in that: The distance between the camera and the detection plane is greater than the distance between the light source and the detection plane.

5. The screen packaging foreign body detection visual imaging system according to claim 1, characterized in that: The camera is an area array camera.

6. The screen packaging foreign body detection visual imaging system according to claim 2, characterized in that: The camera arrangement includes four cameras.

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