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:
Nov. 02, 2004
Filed:
Nov. 08, 2002
Applicant:
Inventor:
Tatsuo Ohta, Hachioji, JP;
Assignee:
Konica Corporation, Tokyo, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G02B 3/02 ; G02B 1/318 ; G02B 1/300 ; G02B 9/08 ; G11B 7/00 ;
U.S. Cl.
CPC ...
G02B 3/02 ; G02B 1/318 ; G02B 1/300 ; G02B 9/08 ; G11B 7/00 ;
Abstract
In an optical lens for use in an optical information recording and reproducing apparatus conducting at least one of recording information on an optical recording medium and reproducing of information recorded on the optical recording medium, by converging light on the optical recording medium, the optical lens includes: lens surfaces provided on both sides of the optical lens; and an antireflection coating provided on the lens surface on at least one side thereof. Thickness of the antireflection coating on a peripheral portion of the lens surface is greater than that of the antireflection coating provided on a center portion of the lens surface.