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:
Dec. 05, 2006
Filed:
Mar. 07, 2002
Applicant:
Toshikazu Kobayashi, Tokyo, JP;
Inventor:
Toshikazu Kobayashi, Tokyo, JP;
Assignee:
Sony Computer Entertainment Inc., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G11B 7/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
In a layer jump, a control signal based on a focus error signal is masked in a period based on a moving speed of an objective lens so as not to be influenced by an unnecessary light component. Thereafter, an observation of the control signal based on the focus error signal is restarted, and a brake signal is sent to the objective lens, and a focus servo is switched to the ON status. Thus, accuracy of the layer jump is improved when the unnecessary light component exists in an interlayer portion of the focus error signal.