Patent ID: 6930834
Filing Date: 2005-08-16
Classification: C23F,G02B,G03F

Abstract:
1. A method of manufacturing a diffractive optical element by transferring a mask pattern to a workpiece comprising the steps of: defining a shape of a vertical portion of the diffractive optical element by use of a first mask; and defining a shape of a slant portion of the diffractive optical element by transferring a shape of a surface of a second mask in a processing region determined by the first mask, wherein the surface of the second mask is tilted obliquely, wherein the shape of the slant portion of the diffractive optical element is determined by the transferred shape of the surface of the second mask, wherein the first mask is made of first and second materials, wherein, after a first processing region determined by the first material is processed, the first processing region is covered by the second material and, subsequently, the first material is removed, and wherein while using a portion from which the first material has been removed as a second processing region, the first processing region determined by the first material is replaced by the second material to cause a processing region inversion.