Aluminum shell internal imaging structure
By adopting specific light source angles and lens adjustments in the internal imaging structure of the aluminum shell, the problems of insufficient adaptability of internal imaging and serious mirror interference in the prior art are solved, efficient defect detection is achieved, labor costs are saved, product yield and production efficiency are improved.
Patent Information
- Application Number
- CN202420706110.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-08
- Publication Date
- 2025-03-07
- Estimated Expiration
- 2034-04-08
AI Technical Summary
The existing imaging schemes have problems such as insufficient adaptability and serious interference in imaging mirrors when imaging internally in the aluminum shell, resulting in the inability to effectively detect defects in the aluminum shell.
An internal imaging structure of an aluminum shell is adopted, including a camera, a coaxial lens and a light source for imaging. Through specific light source angles and lens adjustments, clear imaging of the aluminum shell is achieved.
It improves the accuracy and efficiency of internal defect detection of aluminum shells, reduces labor costs, and improves product yield and production efficiency.
Smart Images
Figure CN222579963U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of visual imaging detection, in particular to an internal imaging structure of an aluminum shell. Background Art
[0002] With the development of economy and the improvement of industrialization technology, the labor cost in factories has gradually increased. Visual inspection technology has been promoted by more industries due to its low cost, high accuracy and high safety. The aluminum shell manufacturing industry has also adopted this technology. In visual inspection machines, the imaging scheme mostly uses a camera with an ordinary lens and a light source to use the principle of light refraction at a specific angle to perform imaging. However, due to the hollow shape of the aluminum shell, the existing imaging scheme has major drawbacks, specifically:
[0003] 1. High adaptability of product size: Ordinary lenses are mostly based on the principle of pinhole imaging, so their shooting distance is limited. Since the differences between different sizes of aluminum shells are large, the adaptability of the original ordinary lenses cannot meet their change range.
[0004] 2. Serious interference of imaging mirror: The inner surface of the aluminum shell can be approximated as a smooth mirror. The light source is prone to mirror reflection during the irradiation process, causing imaging interference between adjacent surfaces and affecting the accuracy of subsequent detection. Utility Model Content
[0005] The technical problem to be solved by the utility model is to provide an aluminum shell internal imaging structure for judging whether there are serious defects inside the aluminum shell, so as to solve the problem that the interior of the aluminum shell cannot be imaged in industrial visual inspection.
[0006] The utility model adopts the following technical scheme to solve the technical problems: an internal imaging structure of an aluminum shell, comprising a camera, a lens coaxially arranged with the camera, and a light source for imaging; the angle between the central axis of the camera and the lens after being coaxially arranged and the central axis of the aluminum shell is 68-72°; the vertical distance between the light-emitting surface of the light source and the aluminum shell is 28-32 mm; the angle between the light-emitting surface of the light source and the aluminum shell is 58-62°; the height of the light source from the bottom of the aluminum shell is 75-82 mm; the imaging light path of the light source and the camera comprises a forward light path and an edge light path; the irradiation point of the forward light path is located on the opposite side of the imaging point, and the light enters the camera for imaging after being reflected and refracted inside the aluminum shell; the imaging point of the edge light path is located at the edge inside the aluminum shell.
[0007] Furthermore, the light source described in the utility model is a plane light source; the vertical distance between the light-emitting surface of the light source and the aluminum shell is 30 mm; the angle between the light-emitting surface of the light source and the aluminum shell is 60°; the height of the light source from the bottom of the aluminum shell is 80 mm.
[0008] Furthermore, the camera described in the present invention is an area array camera, and the lens described is a shift lens; the lens changes the image projection mode by adjusting the relative position between the lens and the area array camera through up and down swinging.
[0009] Furthermore, the tilt-shift lens of the present invention stretches the imaging effect from a rectangular plane to a trapezoidal plane.
[0010] The beneficial effect of the utility model is that it solves the defects existing in the background technology.
[0011] 1. Save labor costs: Because the original visual inspection equipment cannot image the inside of aluminum shell products during defect detection, it is impossible to detect defects inside the product. Therefore, in the final inspection of the finished product, it is still necessary to manually observe whether there are defects inside. After using this technology, internal defect detection can be added to the visual inspection equipment, thereby reducing the re-judgment manpower and saving some labor costs.
[0012] 2. Improve product yield: There are many types of defects inside aluminum shells, and each defect has different forms. During the inspection process, whether each defect is detected or not depends more on the subjective judgment of the inspectors. There are differences in the detection results, and it is easy to make mistakes in judging defective products. By using this technology, the different characteristics of different defects can be clearly presented in the imaging system, visual inspection can be achieved, and the defect detection standards can be quantified, thereby improving product yield.
[0013] 3. Improve production efficiency: Manual inspection of the interior of the aluminum shell requires repeated observation, and extremely high requirements are placed on the production workshop environment, the proficiency of the inspection personnel, and the work efficiency of the inspection personnel. By using this technology in high-speed inspection machines, the inspection efficiency can be greatly improved, thereby improving the production efficiency of the product. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 It is the imaging optical path diagram of the utility model;
[0015] Figure 2 This is a schematic diagram of the imaging method of the utility model's tilt-shift lens;
[0016] Figure 3 It is the imaging point map of the utility model;
[0017] In the figure: 1. Camera; 2. Light source; 3. Tilt-shift lens; 4. Aluminum shell; 5. Imaging point; 6. Forward light path; 7. Edge light path. DETAILED DESCRIPTION
[0018] Now the utility model is further described in detail in conjunction with the accompanying drawings and preferred embodiments. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the utility model in a schematic manner, and therefore only show the components related to the utility model.
[0019] like Figure 1-Figure 3 The structure for imaging the interior of an aluminum shell shown in the figure analyzes the imaging principle and lens performance, and according to the characteristics of the reflectivity of the interior of the aluminum shell, uses a shift lens to achieve imaging of the inner wall of the aluminum shell by means of light path refraction at a special low angle; it includes a camera 1, a shift lens 3 coaxially arranged with the camera, and a light source 2 for imaging;
[0020] The angle α between the central axis of the camera and the lens after being coaxially arranged and the central axis of the aluminum shell 4 is 70°; the vertical distance h1 between the light-emitting surface of the light source and the aluminum shell is 30 mm; the angle β between the light-emitting surface of the light source and the aluminum shell is 60°; the height h2 of the light source from the bottom of the aluminum shell is 80 mm; the imaging light path of the light source 2 and the camera 1 includes a forward light path 5 and an edge light path 6; the irradiation point of the forward light path is located on the opposite side of the imaging point 5, and the light enters the camera for imaging after reflection and refraction inside the aluminum shell; the imaging point 5 of the edge light path is located at the edge inside the aluminum shell.
[0021] like Figure 1 As shown, camera 1 is an area array camera, and light source 2 is a plane light source, which is the main component of imaging; light source 2 irradiates the opposite side of the photographed product at a direction of 60°, and utilizes the reflection and refraction inside the product to illuminate the corresponding side to be photographed, thereby forming an image with the camera.
[0022] Then, the tilt-shift lens 3 is used to adjust the relative position between the lens and the photosensitive element by swinging up and down, so as to change the projection mode of the image and stretch the original rectangular plane into a trapezoid through a specific angle, so that the inclined plane of the inner wall of the product can be focused on the focal plane, thereby making the inclined plane of the inner wall image clear. The imaging mode is as follows: Figure 2 This method breaks the way that ordinary lenses can only focus clearly on the plane perpendicular to the central axis of the lens, solves the problem that ordinary lenses have insufficient depth of field when shooting large inclined planes and cannot capture complete and clear images, and achieves different depths to adapt to aluminum shell products of different sizes.
[0023] Then through Figure 3 The area array camera of this method places the edge of the product at the center of the shooting, so that the edge light path 7 at the edge position cannot be reflected into the camera, while the remaining light paths, such as the forward light path 6, can still pass through in the original way, thereby removing the mirror reflections produced by other surfaces.
[0024] The utility model uses a 60° angle to illuminate the opposite side of the imaging surface and uses a shift lens to flatten the product with depth and eliminate the reflections of other surfaces through multiple shots; not only can the shift lens be used to stretch the product plane to the same horizontal plane, so that the lens can adapt to the changes of different products, and the product adaptability is high; and the light source is used to illuminate the opposite side to be photographed, and its mirror reflection characteristics are used. The camera accepts the light path at a specific angle to improve the imaging quality. Multiple shots are used to remove the internal reflection at a fixed angle, and the imaging is stable and has strong anti-interference.
[0025] The above description only describes the specific implementation methods of the utility model. Various examples do not limit the essential content of the utility model. Ordinary technicians in the relevant technical field can modify or deform the specific implementation methods described above after reading the description without departing from the essence and scope of the utility model.
Claims
1. An internal imaging structure of an aluminum shell, characterized in that: It comprises a camera, a lens coaxially arranged with the camera and a light source for imaging; the angle between the central axis of the camera and the lens coaxially arranged and the central axis of the aluminum shell is 68-72°; the vertical distance between the light-emitting surface of the light source and the aluminum shell is 28-32 mm; the angle between the light-emitting surface of the light source and the aluminum shell is 58-62°; the height of the light source from the bottom of the aluminum shell is 75-82 mm; the imaging light path of the light source and the camera comprises a forward light path and an edge light path; the irradiation point of the forward light path is located on the opposite side of the imaging point, and the light enters the camera for imaging after being reflected and refracted inside the aluminum shell; the imaging point of the edge light path is located at the edge inside the aluminum shell.
2. The internal imaging structure of an aluminum shell as claimed in claim 1, characterized in that: The light source is a plane light source; the vertical distance between the light emitting surface of the light source and the aluminum shell is 30 mm; the angle between the light emitting surface of the light source and the aluminum shell is 60°; the height of the light source from the bottom of the aluminum shell is 80 mm.
3. The internal imaging structure of an aluminum shell as claimed in claim 2, characterized in that: The camera is an area array camera, and the lens is a shift lens; the lens changes the image projection mode by adjusting the relative position between the lens and the area array camera through up and down swinging.
4. The internal imaging structure of an aluminum shell as claimed in claim 3, characterized in that: The tilt-shift lens stretches the imaging effect from a rectangular plane to a trapezoidal plane.