Upper pattern detection device of light guide plate

Abstract

The present invention provides a pattern detection device on the upper surface of a light guide plate, which includes: a light guide plate, forming a pattern on the upper surface and a lower surface, and forming a transparent material film between the upper surface and the lower surface; an illuminating device arranged on the light guide plate. One side of a virtual vertical plane that is at right angles to the top of the plane; the image acquisition unit is disposed on the other side of the vertical plane corresponding to the lighting device. The light irradiated from the illuminating device to the light guide plate is scattered and irradiated the farther away from the light source, the light irradiated from the illuminating device is deformed from the light guide plate and enters the image acquisition part, and the image acquisition part The image acquired captures only the light reflected from the upper side of the light guide plate.

Description

technical field [0001] The present invention relates to a pattern detection device on the upper surface of a light guide panel, and more particularly to a detection device for optically detecting defects and surface states of a pattern in a light guide panel (Light Guide Panel) process. Background technique [0002] Generally speaking, a light guide plate refers to a transparent acrylic panel made purely of polymethyl methacrylate (PMMA: Poly Methyl MethAcrylate) resin. A protective paper was attached to the surface on which the protrusions were formed. [0003] Moreover, on the top of the light guide plate of the existing light guide plate detection device, the lighting device is arranged at a certain angle to the top of the light guide plate, the light is incident on the top of the light guide plate at a certain angle, and the image acquisition unit is arranged at a certain angle relative to the top of the light guide plate . [0004] At this time, the lighting device il...

AI Technical Summary

Problems solved by technology

[0006] Thus, there is a problem that it is difficult to distinguish the upper part and the lower part of the light guide plate because the foreign objects and scratches formed on the lower part are captured by the image acquisition part.

[0007] Therefore, it is difficult to recognize only the processing patterns formed on the upper surface of the light guide plate.

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