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:
Sep. 30, 2003
Filed:
Jan. 09, 2001
Junichi Furukawa, Tsurugashima, JP;
Pioneer Corporation, Tokyo, JP;
Abstract
An optical information reproduction apparatus is provided that, even when spherical aberration has occurred because of a thickness error in a transmissive substrate of an optical disk, is capable of improving the information reading accuracy by correcting the spherical aberration. The spherical aberration of an optical system is corrected while changing the amount of correction in a state where an objective lens is retained at a position on a focus adjusting orbit where the amplitude level of a reading signal read from an optical recording medium reaches a maximum. The spherical aberration is then corrected by using the amount of correction, which is defined as the final amount of spherical aberration correction, where the amplitude level of a tracking error signal obtained during this time reaches the maximum.