Patent ID: 9291753
Filing Date: 2016-03-22
CPC Classification: B29D,G02B

Claim Text:
1. A diffraction optical element, comprising: a base made of a first optical material containing a first resin, the base having a diffraction grating shape on a surface thereof; and an optical adjustment layer made of a second optical material containing a second resin, the optical adjustment layer being formed on the diffraction grating shape of the base, wherein the base includes a first region having the diffraction grating shape on a surface thereof, and a second region positioned outside the first region, wherein the optical adjustment layer is formed so as to cover the first region and at least a part of the second region, wherein the second region has a plurality of anchor grooves formed therein, wherein a part of a surface of the second region has a planar shape, and the anchor grooves have a recessed shape with respect to the planar shape, and wherein a depth of an anchor groove of the plurality of anchor grooves, which is positioned on an outermost side, is smaller than a depth of another anchor groove of the plurality of anchor grooves, which is positioned on an innermost side.