Patent ID: 9465149
Filing Date: 2016-10-11
CPC Classification: G02B,Y10T

Claim Text:
1. A diffraction element, comprising: a plurality of blazed surfaces formed on a brittle material, the plurality of blazed surfaces comprising a first blazed surface and a second blazed surface adjacent to the first blazed surface; a non-blazed surface connecting the first blazed surface and the second blazed surface; and a metal reflecting film formed on the plurality of blazed surfaces, wherein the diffraction element permits light to pass into the diffraction element and to be reflected by the metal reflecting film formed on the plurality of blazed surfaces so that beams of the light reflected interfere, by the plurality of blazed surfaces, with each other and pass out of the diffraction element for spectral separation of the light, wherein an angle formed between the non-blazed surface and the first blazed surface is an acute angle of 86° or more, and wherein a chip or crack formed between the non-blazed surface and the first blazed surface falls in a shadow of the second blazed surface.