Patent ID: 7582397
Filing Date: 2009-09-01
Classification: G03F

Abstract:
1. A method for producing the half tone mask comprising: a transparent substrate; a semitransparent film or shading film provided on the transparent substrate; a clear defect portion being a missing portion of a complete pattern that should be formed when it is assumed that the semitransparent film or shading film is completely well formed; a shading portion, having a transmissivity of 0 to 2% or 2 to 6%, provided in the clear defect portion; and a semitransparent portion, formed at the peripheral portion of the shading portion, having a transmissivity larger than that of said shading portion wherein said shading portion is a first deposition film deposited by FIB radiation, said semitransparent portion is a second deposition film deposited by FIB radiation and having a film thickness smaller than that of said first deposition film.