Patent ID: 6665120
Filing Date: 2003-12-16
Classification: G02B,Y10T

Abstract:
A reflective optical element in which light impinges from at least one plane of a transparent substrate into the transparent substrate, repeats reflecting from the back plane in the transparent substrate, and projects out of the transparent substrate through planes other than the plane of the transparent substrate from which the light has impinged, wherein reflection film contributing to back plane reflection in the transparent substrate is a thin metallic film which is constructed by laminating between the transparent substrate and an amorphous fluorocarbon resin, and wherein an anti-reflection film comprising the amorphous fluorocarbon resin having film thickness of 60 nm to 170 nm is formed on the light incidence plane and light projection plane and wherein the thin metallic film has (a) a reflectivity from 80 to 99.5% at a wavelength range of 350 nm to 900 nm and (b) a film thickness from 50 nm to 1,000 nm.