Patent ID: 9442221
Filing Date: 2016-09-13
CPC Classification: B05D,C03C,C09D,G02B,Y10T

Claim Text:
1. An optical member comprising: a layer on a surface of a base, the layer mainly containing aluminum oxide and having a textured structure formed of aluminum oxide crystals, wherein the optical member meets the following expression (1): where letting the number of aluminum atoms obtained by analyzing a surface of the optical member using X-ray photoelectron spectroscopy at a photoelectron take-off angle of 45° be 1, X represents the ratio of the number of oxygen atoms to the number of aluminum atoms, i.e., O/Al; and letting the number of aluminum atoms obtained by analyzing the surface of the optical member using X-ray photoelectron spectroscopy at a photoelectron take-off angle of 75° be 1, Y represents the ratio of the number of oxygen atoms to the number of aluminum atoms, i.e., O/Al, wherein X exceeds 2.0.