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:
Sep. 17, 1996
Filed:
Sep. 01, 1994
Applicant:
Inventors:
Minoru Otani, Utsunomiya, JP;
Junri Ishikura, Utsunomiya, JP;
Assignee:
Canon Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G02B / ; G02B / ;
U.S. Cl.
CPC ...
359586 ; 359580 ; 359588 ; 359589 ;
Abstract
A two-wavelength antireflection film is constituted by a multi-layered film provided on a substrate so as to have antireflection characteristics for a wavelength .lambda..sub.1 and a wavelength .lambda..sub.2 different from the wavelength .lambda..sub.1. Each of the materials constituting the multi-layered film has a refractive index not exceeding 1.7 for a central wavelength .lambda..sub.0 which is defined by