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. 21, 2000
Filed:
Mar. 11, 1999
Applicant:
Inventors:
Masakazu Ogasawara, Saitama, JP;
Yoshitsugu Araki, Saitama, JP;
Sakashi Ootaki, Saitama, JP;
Junichi Furukawa, Saitama, JP;
Kiyoshi Tateishi, Saitama, JP;
Assignee:
Pioneer Electronic Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G02F / ;
U.S. Cl.
CPC ...
359279 ; 359-9 ; 359237 ; 359295 ; 359319 ; 359637 ; 349 57 ; 349200 ; 369 4438 ; 369112 ;
Abstract
An optical pickup includes: a light source, an object lens, and an aberration correction unit for correcting aberration by giving a phase difference to a light beam. The aberration correction unit corrects astigmatism caused by an optical system of the optical pickup.