Forming method of etching mask, control program and program storage medium

摘要

A feedforward control is performed so that a line width of a mask constituted by an Si3N4 layer 102 formed by using a photoresist 105b as a mask is to be the same as a line width of a mask pattern constituted by an SiO2 layer 103 based on a measured line width of the photoresist 105b and the measured line width of the mask pattern constituted by the SiO2 layer 103. For example, a control of a trimming amount of the line width of the photoresist 105b is performed so that the line width of the photoresist 105b is to be the same as the line width of the mask pattern constituted by the SiO2 layer 103.