Patent ID: 7955763

Claim:
A method of manufacturing a mask, comprising the steps of: preparing a mask blank comprising a thin film to be formed into a mask pattern and a resist film formed on the thin film, the thin film being formed on a glass substrate, and patterning the thin film, wherein the glass substrate comprises a pit which is used as a marker and which is formed by irradiating laser light onto an area, having no influence on transfer, on a surface of the glass substrate, wherein the marker includes identification information, an identification symbol or a managing symbol which are unique to at least one of the glass substrate and the mask blank, the marker being correlated with at least one of substrate information of the glass substrate, thin film information of the thin film and resist film information of the resist film, wherein the substrate information is information including at least one of physical properties, chemical properties, optical properties, a surface form, a surface shape, a material, and a defect of the glass substrate, wherein the thin film information is information including at least one of physical properties, chemical properties, electrical properties, optical properties, a surface form, a material, a defect, and a film forming condition of the thin film, and wherein the resist film information is information including at least one of physical properties, chemical properties, a surface form, a material, a defect, and a film forming condition of the resist film.