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:
Jan. 08, 1991
Filed:
Aug. 22, 1988
Applicant:
Inventors:
Akiko Hagiuda, Kanagawa, JP;
Akira Kawakatsu, Kanagawa, JP;
Assignee:
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G02B / ; H01K / ;
U.S. Cl.
CPC ...
350-16 ; 313112 ; 350166 ;
Abstract
An optical interference film being formed by alternately accumulating a low refractive index layer and a high refractive index layer having a prescribed refractive index higher than the low refractive index layer. The high refractive index layer includes at least one metal oxide selected from titanium oxide and tantalum oxide. The low refractive index layer includes silica and a prescribed amount of at least one metal oxide the same as that in the high refractive index layer to avoid inter-layer peeling of high and low refractive index layers.