Patent ID: 6770899
Filing Date: 2004-08-03
Classification: B24B,H01L

Abstract:
A work piece feeding machine which sets a work piece into a through-hole of a carrier and feeds the carrier holding the work piece to a machine for further treatment, comprising:a loading unit for feeding the work piece to the through-hole of the carrier; and a positioning unit for detecting an amount of displacement of the work piece with respect to the through-hole at a detecting position and correcting the position of the work piece in the through-hole on the basis of the detected amount of the displacement thereof, wherein the positioning unit includes: a lighting source section provided on the work piece side or the carrier side, the lighting source section directing polarized light on the work piece and the carrier at the detecting position; at least one camera provided on the carrier side or the work piece side, the at least one camera receiving the polarized light from the lighting source section so as to catch images of an outer edge of the work piece and an inner edge of the through-hole in a visual field thereof; and an image processing section for measuring the amount of displacement of the work piece with respect to the through-hole on the basis of positions of the outer edge of the work piece and the inner edge of the through-hole in the visual field, the image processing section detecting the amount of displacement of the work piece with respect to the through-hole on the basis of difference between intensity of direct light, which is emitted from the lighting source section via a gap between the outer edge of the carrier and the inner edge of the through-hole, and intensity of transmitted light, which has been transmitted through at least one of the work piece and the carrier.