Invention Grant
- Patent Title: Optical disk apparatus
- Patent Title (中): 光盘装置
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Application No.: US11812547Application Date: 2007-06-20
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Publication No.: US07948839B2Publication Date: 2011-05-24
- Inventor: Hiroshi Kayama , Kazuo Momoo
- Applicant: Hiroshi Kayama , Kazuo Momoo
- Applicant Address: JP Osaka
- Assignee: Panasonic Corporation
- Current Assignee: Panasonic Corporation
- Current Assignee Address: JP Osaka
- Agency: Bacon & Thomas, PLLC
- Priority: JP2006-172140 20060622
- Main IPC: G11B7/00
- IPC: G11B7/00

Abstract:
An optical disk apparatus includes: an optical pickup unit for reading out information recorded on an optical disk; a demodulation circuit for demodulating digital data from an output signal of the optical pickup unit; and a controller for performing a servo control based on the output signal of the optical pickup unit. When performing a focus/tracking control in a recess and a protrusion of a guide groove of the optical disk, the controller obtains a focus control gain difference between the recess and the protrusion by comparing focus offsets with respect to variations in amplitudes of signals from the optical disk for the recess and the protrusion, respectively.
Public/Granted literature
- US20070297299A1 Optical disk apparatus Public/Granted day:2007-12-27
Information query
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