Invention Grant
US07826317B2 Optical pickup device, optical recording/reproducing apparatus and gap-control method
失效
光学拾取装置,光学记录/再现装置和间隙控制方法
- Patent Title: Optical pickup device, optical recording/reproducing apparatus and gap-control method
- Patent Title (中): 光学拾取装置,光学记录/再现装置和间隙控制方法
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Application No.: US12197581Application Date: 2008-08-25
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Publication No.: US07826317B2Publication Date: 2010-11-02
- Inventor: Tsutomu Ishimoto
- Applicant: Tsutomu Ishimoto
- Applicant Address: JP Tokyo
- Assignee: Sony Corporation
- Current Assignee: Sony Corporation
- Current Assignee Address: JP Tokyo
- Agency: Oblon, Spivak, McClelland, Maier & Neustadt, L.L.P.
- Priority: JP2007-237136 20070912
- Main IPC: G11B7/00
- IPC: G11B7/00

Abstract:
An optical pickup device is provided. The optical pickup device includes a light source, a focusing optical system configured to irradiate an optical recording medium with near-field light, a light-detecting unit configured to detect a total-reflection return-light quantity from the optical recording medium, a control unit configured to generate a control signal in response to a detection signal supplied from the light-detecting unit, and a drive unit configured to drive the focusing optical system to a predetermined position above the optical recording medium. The control unit feeds forward a push-pull signal in a traveling direction of the drive unit relative to the optical recording medium to a gap-error signal supplied from the light-detecting unit to generate a gap-servo signal. The control unit includes a repetitive controller storing a predetermined number of the push-pull signals.
Public/Granted literature
- US20090067302A1 OPTICAL PICKUP DEVICE, OPTICAL RECORDING/REPRODUCING APPARATUS AND GAP-CONTROL METHOD Public/Granted day:2009-03-12
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