Invention Grant
- Patent Title: Optical information recorder/reproducer, optical information recording/reproducing method and control circuit
- Patent Title (中): 光信息记录器/再现器，光信息记录/再现方法和控制电路
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Application No.: US12377500Application Date: 2007-10-15
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Publication No.: US08130625B2Publication Date: 2012-03-06
- Inventor: Kenji Narumi , Masahiro Birukawa
- Applicant: Kenji Narumi , Masahiro Birukawa
- Applicant Address: JP Osaka
- Assignee: Panasonic Corporation
- Current Assignee: Panasonic Corporation
- Current Assignee Address: JP Osaka
- Agency: Wenderoth Lind & Ponack, L.L.P.
- Priority: JP2006-285922 20061020
- International Application: PCT/JP2007/070045 WO 20071015
- International Announcement: WO2008/047741 WO 20080424
- Main IPC: G11B7/135
- IPC: G11B7/135 ; G11B7/00
Abstract:
A distance control circuit keeps constant the distance between a condensing member and the surface of an optical disk using return light from a region where near field light is generated. Additionally, a focus control circuit controls the focus position of the near field light to sustain it at the position of an information layer using reflection light from the information layer.
Public/Granted literature
Information query
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