Patent ID: 7009689
Filing Date: 2006-03-07
Classification: G03B,G03F

Abstract:
1. An apparatus suitable for holding a photomask, comprising: a photomask holder, having a plurality of through holes; and a plurality of protrusions, wherein each protrusion is comprised of a PEEK or VESPEL material and one side thereof is inclined to form a cambered surface to serve as a supporting ridge, wherein the protrusions are inserted into the through holes of the photomask holder, and wherein a photomask is disposed on the supporting ridges so that a surface contact area and friction between the supporting ridges and chromium deposition formed at a bottom surface of the photomask are substantially reduced so that generation of particulates due to friction between the protrusions and a chromium deposition formed at a bottom surface of the photomask is substantially reduced.