Patent ID: 9696469
Date: 2017-07-04
CPC Classifications: B29D,G02B

Claim:
1. A multilayer diffractive optical element, comprising: a first substrate; a second substrate; a first resin layer having a first diffraction grating pattern disposed on the first substrate; and a second resin layer having a second diffraction grating pattern disposed on the second substrate, wherein the first diffraction grating pattern and the second diffraction grating pattern oppose each other in adhesion to each other, wherein the first resin layer includes a first region provided at a peripheral portion adjacent to a portion of the first diffraction grating pattern, the first region satisfying 1≦h wherein the first resin layer includes a second region provided at a peripheral portion adjacent to the first region, the second region satisfying h wherein Expression (1) below is satisfied, 50≦w wherein the first resin layer and the second resin layer are in adhesion to each other at the first region and the second region.