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:
Aug. 17, 1999
Filed:
Dec. 15, 1997
Applicant:
Inventors:
Masayuki Suzuki, Utsunomiya, JP;
Satoru Mizouchi, Utsunomiya, JP;
Assignee:
Canon Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G02B / ; G02B / ;
U.S. Cl.
CPC ...
359565 ; 359570 ; 359739 ;
Abstract
An optical arrangement including a stop, and an optical element with a diffractive optical surface, wherein the diffractive optical surface is defined on a spherical surface of a curvature radius r, and wherein, where the distance from a point on the diffractive optical surface, which is on an optical axis, to a center of the stop as viewed from the diffractive optical surface is t, a relation 0.8.ltoreq.r/t.ltoreq.1.2 is satisfied.