Patent ID: 6821690
Filing Date: 2004-11-23
Classification: G03F

Abstract:
A photomask comprising:a first photomask consisting of a first quartz substrate and first chromium patterns formed on the first quartz substrate; and a second photomask consisting of a second quartz substrate and second chromium patterns formed on the second quartz substrate, wherein the chromium patterns are divided into two groups respectively consisting of the first chromium patterns and the second chromium patterns in such a fashion that a space defined between adjacent ones of the first or second chromium patterns is more than a space defined between adjacent ones of the first and second chromium patterns so as to avoid a severe diffraction of light passing between adjacent ones of the chromium patterns, and wherein each chromium pattern in one of the chromium groups overlays, by a desired width, with a chromium pattern in the other chromium group arranged adjacent thereto.