Patent ID: 6562253
Filing Date: 2003-05-13
Classification: B29D,G02B

Abstract:
A method of producing an optical element having a multiple-level step-like structure, said method comprising:a first process for providing a first mask pattern at a position corresponding to a predetermined boundary among boundaries at steps of the multiple-level step-like structure of a substrate, the first mask pattern having a width narrower than that of a single step; a second process for providing a second mask pattern upon the substrate having the first mask pattern formed thereon, the second mask pattern having a width corresponding to a single step or plural steps of the multiple-level step-like structure; a third process for processing the substrate by use of the first and second mask patterns and thereafter for removing the second mask pattern while leaving the first mask pattern there; and after repeating the second and third processes plural times of a predetermined number, removing the first mask pattern.