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:
Dec. 05, 1978
Filed:
Apr. 22, 1977
Applicant:
Inventors:
Fumio Onoki, Tokorozawa, JP;
Hajime Kamiya, Kokubunji, JP;
Assignee:
Kabushiki Kaisha Hoya Lens, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G02B / ;
U.S. Cl.
CPC ...
350164 ; 427165 ;
Abstract
A reflection free optical glass coated, in succession, with a medium refractive index layer, such as CeF.sub.3 or Al.sub.2 O.sub.3, a high refractive index layer such as TiO.sub.2, CeO.sub.2 or ZrO.sub.2 which layer contains a plurality of thin layers of MgF.sub.2 of about 10-100A in thickness uniformly interposed in the high refractive index material at intervals of about one eighth of the design wavelength. The outermost coating of the multi-layer optical glass is a low refractive index layer of MgF.sub.2.