Method and system to detect chippings on solar wafer

Abstract

A chipping defect detection system for detecting a chipping defect at chamfer edge of a solar wafer, said solar wafer being substantially regular or square shape having straight edge and chamber edge,comprising: (a) a plurality of imaging means for pickup images of the position of the solar wafer and being positioned horizontally to the focusing plane of the solar wafer; (b) a plurality of illumination means to provide light for the imaging means while in operation thereof; (c) a conveyor belt for transporting the solar wafer horizontally in the course of chipping detection operation; (d) a sensing means providing a signal to trigger the imaging means to start an image capture; and (e) a strobe light driver which is triggered by the imaging means to drive the illumination means such thatthe imaging means provides an exposure time which coincides with the illumination means, thereby the chamfer edges are located at the out-of-focus position at the same position being sensed by the sensing means, and the image captured by the imaging means being not sharp is the chipping on the chamfer edges of the solar wafer. The present invention also discloses a method of chipping defect detection on a solar wafer.

Description

technical field [0001] The present invention relates to a system and method for detecting chipping on the chamfered sidewall of a solar wafer, and more particularly to a chipping detection system and method suitable for detecting chipping on any edge of a solar wafer that may cause cracks and chip breakage . Background technique [0002] Solar cell manufacturers often perform inspection of solar wafers as part of the solar cell manufacturing process. This is to ensure that any defects on the solar wafers are identified in the initial stages and that the subsequently produced solar wafers are of high quality. [0003] Solar wafers are extremely thin silicon wafers commonly used to make solar cells. In the manufacture of solar cells, solar wafers undergo a number of processes, such as deposition, etching, and patterning, etc., to serve as substrates for solar cells before they become functional solar cells during the manufacturing process. Due to the brittle nature of solar...

AI Technical Summary

Problems solved by technology

Currently, the camera cannot detect the gap even when positioned horizontally

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