Lens watermark defect image detection device

Abstract

The invention discloses a lens watermark defect image detection device. The detection device comprises a darkroom cabinet, and a bracket, a light source, a lens holder, a camera and a light screen, which are mounted in the darkroom cabinet. The lens watermark defect image detection device is characterized in that the light source, the lens holder and the light screen are mounted on the bracket from top to bottom; the center of the light source and the center of a supporting part of the lens holder are located on the same axis; the light screen is located below the lens holder; the area of the light screen is larger than that of the supporting part of the lens holder; the camera is located on the side face of the light screen and the vision field of the camera covers the light screen; the camera is connected with a computer by a data line; the computer is used for obtaining an image photographed by the camera and judging the size of a watermark defect. According to the lens watermark defect image detection device, the detection time of a lens is shortened and the detection efficiency of the lens is improved.

Description

technical field [0001] The invention relates to a lens watermark defect image detection device with high detection speed and high precision. Background technique [0002] At present, my country is already the largest lens production country in the world, and the lens output of Jiangsu Danyang alone accounts for 40% of the world. However, my country's lens production and testing technology is relatively backward. Lens testing is an important part of lens production, but this backwardness is particularly prominent in the lens testing process. The detection work is mainly done manually, and there are the following main problems in manual detection: 1. The accuracy of manual detection is low: it will be affected by many factors such as workers' physiological differences, experience, emotion and fatigue, and the judgment standard of manual detection is very vague , it is impossible to quantify and judge lens defects, which eventually leads to uneven product quality, which se...

AI Technical Summary

Problems solved by technology

However, my country's lens production and testing process is relatively backward. Lens testing is an important part of lens production, but this backwardness is particularly prominent in the lens testing process.

The detection work is mainly done manually, and there are the following main problems in manual detection: 1. The accuracy of manual detection is low: it will be affected by many factors such as workers' physiological differences, experience, emotion and fatigue, and the judgment standard of manual detection is very vague , it is impossible to quantify and judge lens defects, which eventually leads to uneven product quality, which seriously affects the sales of lenses and increases return orders; 2. The speed of manual inspection is slow: the detection speed of skilled workers is about 6 pieces / minute Strictly match the production speed on the assembly line; 3. High cost of manual inspection: With the continuous increase of labor costs, the cost of manual inspection will also become higher and higher; 4. Insufficient detection ability of special defects: due to human eyes The resolution is limited, and it is difficult for the human eye to observe very subtle and inconspicuous defects

[0003] For the detection of lens defects, the patent: curved surface lens detection system (CN101464419) proposes a method for detecting lens defects. This method uses a camera to receive reflected light, which has a better effect on scattering defects. The watermark belongs to refraction It is difficult to scatter the incident light, so this method is difficult to detect watermarks, especially small watermark defects

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