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. 17, 2000
Filed:
Mar. 30, 1999
Applicant:
Inventor:
Katsuhiro Koike, Saitama, JP;
Assignee:
Pioneer Electronic Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G02B / ;
U.S. Cl.
CPC ...
359724 ; 359719 ; 359721 ; 359738 ; 359741 ; 359743 ; 359565 ; 2502015 ; 369 4423 ; 369 4424 ;
Abstract
An objective lens for condensing a light beam, has at least one of annular grooves and ridges producing a phase difference. Each of the annular groove and ridge is formed concentrically on at least one of an incident surface which said light beam is introduced, and an emission surface which said light beam is emitted.