Device for detecting eccentricity of positive focal length lens
The detection device, which combines a laser emitter and a receiving sensor, solves the problem of inefficient lens eccentricity detection in existing technologies. It enables fast, accurate, and low-cost lens eccentricity detection, improves imaging quality and optical system performance, and is suitable for batch inspection by small and medium-sized enterprises.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- FUJIAN FULAN OPTICAL CO LTD
- Filing Date
- 2025-05-12
- Publication Date
- 2026-05-05
AI Technical Summary
Existing technologies are insufficient for efficiently and accurately detecting the eccentricity of positive focal length lenses, leading to a decline in image quality and optical system performance. Furthermore, the high cost of testing equipment limits its use by small and medium-sized enterprises.
The detection device, which uses a laser emitter and a receiving sensor, detects the lens eccentricity by aligning the laser beam. Combined with an arc-shaped limiting protrusion and a gold velvet cloth to protect the lens, and a corrosion-resistant receiver base and a polycarbonate layer to protect the receiving sensor, it achieves fast and accurate eccentricity detection.
It enables simple, efficient, and low-cost lens eccentricity detection, ensuring product quality, reducing defect rates, and is suitable for the batch inspection needs of small and medium-sized enterprises.
Smart Images
Figure CN224202711U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of lens eccentricity testing technology, specifically to a device for testing the eccentricity of a positive focal length lens. Background Technology
[0002] In the lens manufacturing process, eccentricity is one of the key indicators for measuring lens quality. The effects of eccentricity on positive focal length lenses are mainly reflected in the following two aspects: 1. Effects on image quality: (1) Aberrations: Eccentricity will cause aberrations such as coma, astigmatism and distortion in the optical system. (2) Reduced sharpness: Light cannot be focused along the ideal path, which reduces the sharpness and contrast of the image, making the image blurry and difficult to distinguish details. (3) Affects color reproduction: It makes the difference in the focusing position of light of different wavelengths greater, aggravates chromatic aberration, and leads to color distortion in the image. 2. Effects on the performance of the optical system: (1) Affects the accuracy of the optical path: In precision optical systems such as laser processing, astronomical observation, and medical imaging equipment, lens eccentricity will cause the optical path to deviate from the design path, resulting in the system failing to achieve the expected accuracy and performance. (2) Reduced system resolution: It limits the ability of the optical system to distinguish fine structures and objects. For applications that require high resolution, such as microscopes and aerial photography, poor control of eccentricity will make the system unable to meet the requirements. 3. Affects system stability: It leads to instability in optical performance. Under different working conditions and environments, the imaging quality and system performance may fluctuate significantly.
[0003] Current methods for detecting positive focal length eccentricity rely on complex and expensive equipment, are cumbersome to operate, and suffer from low efficiency and limited accuracy. These methods fail to meet the needs of large-scale production and cannot achieve 100% inspection of produced positive focal length lenses. Furthermore, the high cost of inspection equipment limits its use and adoption by many small and medium-sized enterprises, leading them to abandon lens eccentricity testing altogether.
[0004] Therefore, there is an urgent need for a simple, efficient, and high-precision lens eccentricity detection device to improve product quality. Utility Model Content
[0005] The purpose of this invention is to provide a device for testing the eccentricity of a positive focal length lens.
[0006] This utility model provides the following technical solution:
[0007] This invention proposes a device for testing the eccentricity of a positive focal length lens, comprising a receiver and a support for placing the lens. A laser emitter for illuminating the center of the lens is fixed on the support, and a receiving sensor is fixed on the receiver. The parallel beam emitted by the laser emitter is aligned with the receiving sensor.
[0008] Furthermore, the support base has an arc-shaped limiting protrusion, and an arc-shaped groove is formed on the arc-shaped limiting protrusion.
[0009] Furthermore, the contact surface between the arc-shaped limiting protrusion and the lens is covered with velvet cloth.
[0010] Furthermore, the receiver base has a receiving hole, and the receiving sensor is located on the side of the receiving hole away from the support base.
[0011] Furthermore, the receiver is a receiver made of S136 steel.
[0012] Furthermore, the receiver base has a receiver plate, the receiver sensor is fixed on the receiver plate, and the surface of the receiver plate facing the laser emitter has a polycarbonate layer.
[0013] Furthermore, the thickness of the polycarbonate layer is 3mm ± 0.05mm.
[0014] Compared with existing technologies, this utility model has a simple structure and is easy to operate. By cooperating with a laser emitter and a receiving sensor, it can quickly and accurately detect whether the eccentricity of a positive focal length lens is up to standard, ensuring that the eccentricity of all positive focal length lenses produced and shipped is within the acceptable range, reducing the risk of defective products leaving the factory, and effectively realizing batch inspection of the eccentricity of positive focal length lenses. Compared with other conventional inspection equipment, this utility model is inexpensive, allowing small and medium-sized enterprises to set up and use it, and effectively reducing inspection time, with an average inspection time of less than 10 seconds per product. Attached Figure Description
[0015] Figure 1 This is a cross-sectional schematic diagram of the actual application of this utility model.
[0016] Figure 2 This is a schematic diagram of the structure of this utility model.
[0017] Figure 3 This is a schematic diagram of the support base of this utility model.
[0018] In the diagram, 00-lens; 1-support base; 11-arc-limiting protrusion; 12-arc-groove; 2-receiver base; 21-receiver hole; 22-receiver plate; 23-polycarbonate layer; 3-laser emitter; 4-receiver sensor. Detailed Implementation
[0019] The present invention will be further described below with reference to the accompanying drawings.
[0020] See Figure 1In one embodiment of this utility model, a device for testing the eccentricity of a positive focal length lens includes a receiver 2 and a support 1 for placing the lens. A laser emitter 3 for illuminating the center of the lens 00 is fixed on the support 1. A receiver sensor 4 is fixed on the receiver 2. The parallel beam emitted by the laser emitter 3 is aligned with the receiver sensor 4. In practical applications, the lens 00 is placed on the support 1, and the laser emitter 3 is turned on. The laser beam illuminating the lens 00 passes through the lens 00. If the receiver sensor 4 receives the laser beam that has passed through the lens 00, the light on the receiver sensor 4 illuminates, and the eccentricity of the positive focal length lens is qualified. If the receiver sensor 4 does not receive the laser beam that has passed through the lens 00, the light on the receiver sensor 4 does not illuminate, and the eccentricity of the positive focal length lens is unqualified.
[0021] In one embodiment of this utility model, the laser emitter 3 is a Loschda laser head, and the receiving sensor 4 is a Panasonic CX-442 photoelectric sensor.
[0022] See Figure 1 and Figure 3 In one embodiment of this utility model, the support base 1 has an arc-shaped limiting protrusion 11, and an arc-shaped groove 12 is provided on the arc-shaped limiting protrusion 11 to facilitate the limiting of the lens 00.
[0023] In the above embodiment, the contact surface between the arc-shaped limiting protrusion 11 and the lens 00 is covered with velvet cloth; that is, the surrounding surface of the arc-shaped groove 12 and the arc-shaped upper surface of the arc-shaped limiting protrusion 11 are covered with velvet cloth; see reference Figure 1 This ensures that lens 00 is not scratched during the inspection process, which could lead to defects.
[0024] See Figure 1 and Figure 2 In one embodiment of this utility model, the receiving base 2 is provided with a receiving hole 21, and the receiving sensor 4 is located on the side of the receiving hole 21 away from the support base 1, and the end of the receiving hole 21 away from the support base 1 is closed; the receiving hole 21 is opened according to the eccentricity range required by different positive focal length lenses, and the laser light falls onto the receiving sensor 4 through the receiving hole 21.
[0025] See Figure 1 In one embodiment of this utility model, the receiver 2 is a receiver made of S136 steel; it is corrosion-resistant and ensures a service life.
[0026] See Figure 1 and Figure 2In one embodiment of the present invention, the receiver base 2 has a receiver plate 22, the receiver sensor 4 is fixed on the receiver plate 22, and the surface of the receiver plate 22 facing the laser emitter 3 has a polycarbonate layer 23; it has sufficient toughness to prevent the laser beam from falling on the surface of the receiver plate 22 and causing deformation when the laser passes through a lens with unqualified eccentricity.
[0027] In the above embodiments, the thickness of the polycarbonate layer 23 is 3mm ± 0.05mm.
[0028] In practical applications, a receiving aperture of a certain size is opened according to the requirements of the eccentricity of different positive focal length lenses. If the receiving sensor receives the laser beam transmitted through the lens, the light on the receiving sensor will light up, and the lens is qualified; otherwise, it is unqualified if it does not light up.
[0029] The embodiments of this utility model are given for the purpose of illustration and description. Although embodiments of this utility model have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this utility model. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this utility model.
Claims
1. A device for testing the eccentricity of a positive focal length lens, characterized in that: The device includes a receiver and a support for placing a lens. A laser emitter for illuminating the center of the lens is fixed on the support. A receiver sensor is fixed on the receiver. The parallel beam emitted by the laser emitter is aligned with the receiver sensor.
2. The device for testing the eccentricity of a positive focal length lens according to claim 1, characterized in that: The support base has an arc-shaped limiting protrusion, and an arc-shaped groove is formed on the arc-shaped limiting protrusion.
3. The device for testing the eccentricity of a positive focal length lens according to claim 1, characterized in that: The contact surface between the arc-shaped limiting protrusion and the lens is covered with velvet cloth.
4. The device for testing the eccentricity of a positive focal length lens according to claim 1, characterized in that: The receiver base has a receiving hole, and the receiving sensor is located on the side of the receiving hole away from the support base.
5. The device for testing the eccentricity of a positive focal length lens according to claim 1, characterized in that: The receiver base is made of S136 steel.
6. The device for testing the eccentricity of a positive focal length lens according to claim 1, characterized in that: The receiver base has a receiver plate, the receiver sensor is fixed on the receiver plate, and the surface of the receiver plate facing the laser emitter has a polycarbonate layer.
7. The device for testing the eccentricity of a positive focal length lens according to claim 6, characterized in that: The thickness of the polycarbonate layer is 3mm ± 0.05mm.