The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 28, 2002
Filed:
May. 12, 2000
Nippon Sheet Glass Co., Ltd., Osaka, JP;
Abstract
In an optical reflector and a manufacturing method thereof, the reflector is superior in durability and has a high reflectivity to visible light, but not being conspicuous in color tone of reflection. The optical reflector comprises a glass substrate, on which are piled up a film of refractive index n , a film of refractive index n , a film of refractive index n , and a film of refractive index n , sequentially, wherein the thickness of the films are adjusted so that a relationship, n n n n is established among those refractive indices n , n , n and n The film of refractive index n is from 30 nm to 60 nm in the film thickness, a reflectivity to visible light is equal to or greater than 75% upon the surface of the film of refractive index n and the value {(a*) +(b*) } is from 0 to 10 when representing the color tone of reflected light upon this film by a* and b* (psychometric chroma coordinates).