1987-12-28
1990-05-01
Arnold, Bruce Y.
350278, 350642, G02B 508, G02B 528
Patent
active
049213318
ABSTRACT:
An improved mirror of a type especially advantageous for use as a rearview mirror for automotive applications. The inventive mirror employs a dielectric multi-layered coating formed on the front side of a glass or plastic transparent substract, the back side of which is provided with a light-absorbing layer. The dielectric coating is composed of three to six dielectric layers laminated one on top of another and having alternately differing refractive indices. At least one of the laminated dielectric layers has an optical thickness of .lambda..sub.0 /2, where .lambda..sub.0 is a wavelength of light used as a reference for design purposes and which is in a range of 500 to 580 nm for an incident angle of 0.degree., with each of the remaining dielectric layers having a thickness of .lambda..sub.0 /4.
REFERENCES:
patent: 2381728 (1945-08-01), Dimmick
patent: 3432225 (1969-03-01), Rock
patent: 4805989 (1989-02-01), Nakajima
Arnold Bruce Y.
Callaghan Terry S.
Hoya Corporation
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