Optical flat plate detection apparatus

Abstract

The embodiments of the present invention disclose an optical flat plate detection apparatus, which comprises a hollow elliptical-column-shaped reflector, a light source and a line array camera, wherein the inner surface of the reflector is a reflection surface and is provided with at least two pairs of slits, the center connection planes of each pair of the slits pass through the first focal lineof the reflector, the first pair of the slits are used for placing an optical flat plate to be detected so as to make the optical flat plate to be detected pass through the first focal line, the lightsource is arranged at the second focal line position of the reflector, the line array camera is arranged outside the first slit in the second pair of the slits, and the camera lens of the line arraycamera is aligned to the first focal line so as to shoot the optical flat plate to be detected. With the technical scheme, the light source is arranged at the second focal line position of the reflector, the light emitted by the light source is converged at the first focal line position, the optical flat plate to be detected is placed at the first focal line position, and the incident angle of thelight at the first focal line position is close to 360 DEG, such that the problem that the partial defect reflection or scattering light on the flat plate surface cannot enter the camera and image due to the small incident angle of the light can be avoided so as to improve the optical flat plate detection effect.

Description

technical field [0001] The invention relates to the technical field of machine vision, in particular to an optical flat panel detection device. Background technique [0002] An optical flat panel is an optical device widely used in the fields of display, imaging, and component packaging. It is composed of transparent optical materials whose front and rear surfaces are parallel to each other. If there are scratches, stains and other defects on the surface of the optical flat panel, it will seriously affect the quality of the product. [0003] Therefore, before the optical flat panel is used, it needs to be inspected for defects. At present, the line scan camera imaging system is usually used to detect the defects of the optical flat panel, and its system composition is as follows: figure 1 As shown, the system includes: a line array camera 101, an LED line array light source 102, and the like. When using this system to inspect the optical flat panel 103, both the front and...

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Problems solved by technology

[0004] However, the LED line array light source has only two channels, and the angle range of the light incident on the surface of the optical flat panel is limited. As a result, the light reflected or scattered by some defects on the flat surface may not enter the camera for imaging, so that the defect in this part cannot be detected.

As a result, optical flat panel inspection with the above systems does not perform well

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