A kind of de-ghosting visual alignment module and method thereof

Abstract

The invention discloses a visual alignment module for de-ghosting, comprising a detection camera, a light splitting main body seat, a polarizer and a light splitting prism. The opposite sides of the light splitting main body seat are provided with imaging entrance ports, and the side perpendicular to the imaging incident surface is provided with imaging entrance ports. There are imaging exit ports, three beam splitting prisms are arranged side by side, the optical path of one beam splitting prism is perpendicular to the optical path of the other two beam splitting prisms, and the two beam splitting prisms are respectively located outside the imaging entrance port and are opposite to the imaging incident direction. perpendicular to each other, the polarization directions of the two polarizers are perpendicular to each other. The invention also provides a visual alignment method. In the invention, mutually perpendicular polarizers are arranged at the two imaging entrance ports, and the opposite imaging optical paths can be blocked by the two polarizers, thereby preventing the formation of a virtual image on the opposite side and affecting the alignment detection of the detection camera; at the same time, the light source is divided into There are two types of light, which can be split to two sides to form imaging light of different frequencies, so that the detection camera can identify more accurately.

Description

technical field [0001] The invention relates to the field of visual detection, in particular to an alignment module and method for visual detection. Background technique [0002] The existing stencil printing machines for printing conductive silver on the PCB substrate have the following shortcomings: the printing on the PCB substrate is carried out piece by piece, which has the characteristics of a single block. For the prior art, the alignment of the conductive silver printed on the PCB substrate is very important, because the existing PCB board printing requires the production of a stencil with a specified circuit to print silver on the PCB. If the PCB board cannot be accurately aligned, the printed circuit board may have problems such as abnormal conduction or unusable use. In the existing alignment equipment, the alignment objects are placed on both sides of the camera, and an alignment module is set between the two objects. For the plane detection with reflective mate...

AI Technical Summary

Problems solved by technology

For the existing technology, the alignment of the conductive silver printed on the PCB base material is very important, because the existing PCB board printing needs to make a stencil with a specified line to print silver on the PCB, if the specified line on the stencil If the PCB board cannot be aligned accurately, there may be problems such as conductive abnormalities or failure to use the printed PCB board.

In the existing alignment equipment, the alignment objects are placed on both sides of the camera, and then the alignment module is set between the two objects. For the plane detection with reflective materials, the reflective material will inevitably produce reflective return. Optical path, when the object on one side reflects light, it will be reflected to the object on the other side, which will cause the light to overlap and make the image unclear. In the existing detection methods, the problem of ghosting cannot be effectively solved

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