High-brightness surface defect detection device based on micro-lens array projection

Abstract

The invention relates to a highlight surface defect detection device based on micro-lens array projection, and relates to the field of defect detection and optics. A light source, a collimating lens and a micro-lens array are sequentially arranged along the direction of an optical axis; meanwhile, the system also comprises a sample to be detected and a camera. Stripe micro-pattern shading layers with different directions and periods can be arranged in the micro-lens array; light rays emitted by the light source pass through the collimating lens and then pass through the micro-lens array and the light shielding layer in the micro-lens array, so that different stripe pattern changes are formed on an image plane; and a stripe pattern formed by the micro-lens array covers the surface of a sample, is shot by the camera and is transmitted to visual processing software in the computer for defect detection. Compared with the prior art, the device has the advantages of simple and compact structure, uniform and clear projection pattern and high defect detection rate.

Description

technical field [0001] The invention relates to the field of defect detection, in particular to a high-brightness surface defect detection device based on microlens array projection. Background technique [0002] In modern industry, machine vision detection is widely used in the fields of working condition monitoring, product inspection and quality control. Machine vision inspection is to use the illumination source and camera to obtain the surface image of the object to be inspected. Parts with highly reflective surfaces such as finely machined metals, plated and coated metals, and plastic parts have strong specular reflections, making it difficult to detect surface defects using machine vision. [0003] The projection device used in the traditional projection method of visual inspection has disadvantages such as complex structure, large equipment volume, high power consumption of the light source, high temperature, short life, unclear image boundary, etc., and the project...

AI Technical Summary

Problems solved by technology

Parts with highly reflective surfaces such as finely machined metals, plated and coated metals, and plastic parts have great difficulty in surface defect detection using machine vision due to strong specular reflections

[0003] The projection device used in the traditional projection method of visual inspection has disadvantages such as complex structure, large equipment volume, high power consumption of the light source, high temperature, short life, unclear image boundary, etc., and the projection distance is also limited to a certain extent.

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