Device and method for detecting film missing defects of resin lenses

Abstract

The invention discloses a device and method for detecting film missing defects of resin lenses. The device comprises a dark box (1), a rotary motor (2), a fixing frame (3), a motion controller (4), amaster controller (5), a camera (6), a light source (7), a lens fixing frame (8) and a background plate (9). The device is characterized in that the rotary motor (2) is fixed at the top of the dark box (1), connected with the motion controller (4) and used for rotationally switching positions of the camera (6) and the light source (7) to realize two-time subarea collection of lenses; the motion controller (4) and the master controller (5) are connected through a serial port, and the motion controller (4) is triggered through a serial port signal to drive the rotary motor (2) to execute the rotation action; the fixing frame (3) is connected with the rotary motor (2) through a key slot structure. The device and the method can be applied to detection of film missing defects of various lensessuch as myopic glasses, presbyopic glasses, hyperopia glasses and astigmatoscopes.

Description

technical field [0001] The invention belongs to the field of lens detection, and in particular relates to a device and method for detecting a resin lens film leakage defect using machine vision technology. technical background [0002] Coating is one of the important steps in the subsequent processing of lens production. It not only helps to improve the hardness and scratch resistance of the lens, but also can achieve focusing, collimation, filtering, reflection and refraction effects. At present, the vacuum cold plating method is used for lens coating. After the coating material is vaporized and ionized, it hits the surface of the lens to form a very thin film. However, due to the uneven distribution of the film thickness and the insufficient cleanliness of the lens during the production process, some lenses have leaks. Film defects seriously affect the optical imaging effect of the lens. Therefore, the detection of film leakage is an indispensable defect detection item in ...

AI Technical Summary

Problems solved by technology

At present, the vacuum cold plating method is used for lens coating. After the coating material is vaporized and ionized, it hits the surface of the lens to form a very thin film. However, due to the uneven distribution of the film thickness and the insufficient cleanliness of the lens during the production process, some lenses have leaks. Film defects seriously affect the optical imaging effect of the lens. Therefore, the detection of film leakage is an indispensable defect detection item in the lens production industry.

At present, all domestic lens manufacturers adopt manual inspection method, which largely depends on the experience and technology of inspectors, and is easily affected by subjective factors, individual differences and other factors, and it is easy to miss defective products.

[0003] After relevant patent retrieval, the defect detection method for resin lenses has been gradually improved, such as: an automatic detection device and method for lens surface defects (CN105606629A), a detection device for point and linear impurities on the lens surface (CN103630553A), Intelligent lens surface defect detection system based on machine vision and its implementation method (CN105891233A), a grating-modulated lens defect automatic detection device and method (CN105067639A), the patents have realized point and line detection of resin lenses The detection of shape and planar defects, but none of them involve the detection of lens coating

[0004] The lens surface coating quality detection is mainly aimed at the coating thickness, such as: a lens surface coating thickness uniformity test device (CN107478165A), a method for simultaneous multi-point lens coating thickness detection (CN104048612A) and a test coating thickness The method (CN102087105A), by constructing a multi-point optical system, calculates the thickness of the film more accurately according to the principle of refraction and total reflection, but it does not mention the detection ability of this method for the leakage of the lens, and its complex optical system is difficult Meet the real-time online detection of defects

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