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:
Oct. 02, 2001
Filed:
Feb. 24, 2000
Applicant:
Inventors:
Isamu Kaneko, Kawaguchi, JP;
Tomohiro Saito, Kawaguchi, JP;
Assignee:
Enplas Corporation, Saitama, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G02B 3/02 ; G02B 3/00 ;
U.S. Cl.
CPC ...
G02B 3/02 ; G02B 3/00 ;
Abstract
In a biconvex lens,, at least one of faces thereof is formed into an aspherical shape, so that the radius of curvature of the second face of the lens,is equal to or larger than 0.65 times the focal length, and the radius of curvature of the first face is over 3 times the radius of curvature of the second face. Thus, the lens can be produced easily at a small size and a light weight.