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:
Aug. 10, 2004
Filed:
Jan. 11, 2002
Applicant:
Inventor:
Toshikazu Kobayashi, Tokyo, JP;
Assignee:
Sony Computer Entertainment, Inc., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B 7/00 ;
U.S. Cl.
CPC ...
G11B 7/00 ;
Abstract
In an optical disk apparatus, a sensitivity adjusting circuit measures a time between a reflection on a surface and a reflection on a recoding layer of an optical disk when moving an objective lens. This time is considered to be in accordance with sensitivity of an actuator during layer jumping, and thereby the magnitudes of a kick pulse and a brake pulse to be applied to the coil of the actuator is increased or decreased in accordance with the time between the reflection on the surface and the reflection on the recording layer. Thereby, the sensitivity dispersion of the actuator of the optical pickup is adjusted.