Multi-layered surface reflecting mirror

Details Multi-layered surface reflecting mirror Multi-layered surface reflecting mirror

1989-10-23

1991-04-16

Arnold, Bruce Y.

350278, 350642, 350164, G02B 508, G02B 528

Patent

active

050077104

ABSTRACT:
A multi-layered surface reflecting mirror comprises a substrate, a metal or semiconductor film formed on one side of the substrate and a dielectric multi-layered film formed on the metal or semiconductor film. The dielectric multi-layered film consisting of a low refractive index material layer having an optical thickness of 0.05.lambda.o (.lambda.o/20)-0.4.lambda.o (2/5.lambda.o) (.lambda.o is the wavelength of a light used as the reference measurement for design purposes) and a high refractive index material layer having an optical thickness of .lambda.o/2. The low refractive index material layer existing closer to the metal or semiconductor film relative to the high refractive index material layer, and the high refractive index material layer existing closer to the atmosphere relative to the low refractive index material layer. The multi-layered surface reflecting mirror is used mainly as a rearview mirror for automobiles, a mirror with a convex surface that warns drivers against hazards on the road, an ornamental mirror, etc.

REFERENCES:
patent: 3033701 (1962-05-01), Wozniak
patent: 3679291 (1972-07-01), Apfel et al.
patent: 4673248 (1987-06-01), Taguchi et al.
patent: 4805989 (1989-02-01), Nakajima
patent: 4856019 (1989-08-01), Miyata et al.
Reale, Carlo, "Reflectance of Metallic Films Coated with Dielectric Layers", Manufacturing Optician International, vol. 22, No. 1, Jul. 1969, pp. 9, 11-13.

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