MARK FORMATION METHOD OF OPTICAL GLASS MEMBER, METHOD FOR PRODUCING OPTICAL GLASS MEMBER WITH MARK, OPTICAL GLASS MEMBER WITH MARK, AND METHOD FOR READING MARK OF OPTICAL GLASS MEMBER

摘要

PROBLEM TO BE SOLVED: To provide a mark formation method of an optical glass member, whereby a mark, which lowers the visibility of the mark by preventing scattering and reflecting of light at a mark edge part and does not influence optical characteristics of an optical glass member, is formed.SOLUTION: The mark formation method of an optical glass member includes preparation of a glass preform, formation of a coating film including glass particles on the surface of the glass preform, formation of a fused film by fusing glass particles on the surface of the glass preform by irradiating laser light to a predetermined area of the coating film, and pressing of the glass preform with the fused film formed thereon.