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:
Jul. 15, 2008
Filed:
Nov. 17, 2006
Applicants:
Koichiro Nishikawa, Takasaki, JP;
Takashi Fukuhara, Tokyo, JP;
Inventors:
Koichiro Nishikawa, Takasaki, JP;
Takashi Fukuhara, Tokyo, JP;
Assignee:
Canon Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G11B 7/0065 (2006.01);
U.S. Cl.
CPC ...
Abstract
The recording mediumis radiated with light beam from the second light source to obtain servo signal from the reflected light. At least one of the relay lensesin the relay optical system is moved perpendicularly to the optical axis according to the servo signal to follow-up moving direction of the recording medium. The light beam from the second laser light source merges with an optical system from the first laser light source to the recording mediumbetween at least one of the relay lensesand the spatial light modulator