Patent ID: 7268865
Filing Date: 2007-09-11
Classification: G01N

Abstract:
1. A method of detecting foreign objects in a display panel fabrication, comprising the steps of: mounting a laser source and a laser detector on a first side of a target to be detected, wherein the laser detector is mounted on an adjustable gauge to adjust both horizontal and vertical positions of the laser detector; providing a reflector located on a second side of the target; using the laser source to provide a laser beam which passes through a detecting position located above the target and then moves on to the reflector; reflecting the laser beam with the reflector to form a feedback light beam which passes through the detecting position and moves directly on to the laser detector; receiving the feedback light beam with the laser detector; measuring the intensity of the feedback light beam; and comparing the intensity of the feedback light beam with a predetermined laser intensity attenuation value to determine if any foreign object exists on the surface of the target.