Light source device, and surface defect detection method and device

Abstract

The invention relates to a light source device, and a surface defect detection method and device. The light source device comprises a bottom plate provided with a light emitting port, a spherical shell, a light source and a reflection-transmission mirror, wherein the spherical shell is a hemispherical outline, is buckled on the bottom plate, and forms a hemispherical cavity with the bottom plate;an observation window is formed in a position, opposite to the light emitting port, of the spherical shell; an inner wall of the spherical shell is coated with a diffuse reflection coating; the lightsource is arranged at a preset position on the bottom plate and is used for providing illumination; light is diffusely reflected by the diffuse reflection coating and then is emitted out of the cavityfrom the light emitting port to form uniform irradiation light; and the reflection-transmission mirror is arranged in the cavity, is shielded between the light emitting port and the observation window, and is used for enabling one part of the light to penetrate and the other part of the light to be reflected when the light on two sides of the reflection-transmission mirror is emitted to the reflection-transmission mirror. By using the light source device, the surface defect detection device and method, an image of a camera can be prevented from being seen during defect detection, and scratches and backgrounds on a surface of an object can also be distinguished.

Description

technical field [0001] The invention relates to the technical field of machine vision light sources, in particular to a light source device, a method and a device for detecting surface defects. Background technique [0002] In the application of machine vision, the field of detection, especially defect detection, has always been a difficult research point. Among them, the detection of smooth specular objects is the most difficult point, and the main difficulty is focused on lighting. In the actual application process of machine vision, lighting is the first step in the operation, and it is also a very critical step, which often determines the complexity of the subsequent processing algorithm and the success or failure of the entire solution. [0003] At present, the processing level is getting more and more exquisite, more products have smooth surface and streamlined shape, and the demand for smooth specular reflection surface inspection is also increasing. Therefore, it i...

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Problems solved by technology

[0005] Based on this, it is necessary to provide a light source device, a surface defect detection method and a device for the problem that when the traditional light source provides light, it is difficult to distinguish the scratch from the background or leave the image of the camera.

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