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:
Apr. 16, 2004
Shinichi Konishi, Nara, JP;
Takeshi Nakajima, Nara, JP;
Shinichi Konishi, Nara, JP;
Takeshi Nakajima, Nara, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
A tilt control apparatus includes an orthogonal shift detector () which detects an orthogonal shift by comparing a pair of a plurality of tap coefficients (C, . . . , C) of a FIR filter and generates an orthogonal shift signal, and an actuator varies the inclination of the optical axis of the light beam to correct the orthogonal shift, and a tilt controller () controls the drive of the actuator in accordance with the orhogonal shift signal to minimize the orthogonal shift. In the information recording operation, the orthogonal shift obtained based on a recording track is previously stored in a temporary storage portion and the stored orthogonal shift is used to conduct the tilt control.