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. 03, 2005
Filed:
Apr. 21, 2003
Applicants:
Noboru Ninomiya, Ome, JP;
Naohisa Yamaguchi, Nagano-ken, JP;
Eiki Matsuo, Suwa, JP;
Inventors:
Assignee:
Seiko Epson Corporation, , JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G02B003/02 ; G02B013/18 ; H04N005/225 ;
U.S. Cl.
CPC ...
Abstract
For a positive lens having a convex surface on an image side thereof and a diaphragm provided on an object side thereof, the following conditions are satisfied when a surface of the lens at least on the image side is aspheric, a focal length is f, a distance from the diaphragm to a front surface of the lens is D, and a thickness of the lens is D: 0.2<D/f<0.8, 1.2<(D+D)/f, and 0.4<R/f<1.0.