Invention Grant
- Patent Title: Optical disc apparatus and defocus correcting method
- Patent Title (中): 光盘装置和散焦校正方法
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Application No.: US12767408Application Date: 2010-04-26
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Publication No.: US08120999B2Publication Date: 2012-02-21
- Inventor: Yoshinori Ishikawa , Gohshi Jin
- Applicant: Yoshinori Ishikawa , Gohshi Jin
- Applicant Address: JP Tokyo JP Tokyo
- Assignee: Hitachi-LG Data Storage, Inc.,Hitachi Consumer Electronics Co., Ltd.
- Current Assignee: Hitachi-LG Data Storage, Inc.,Hitachi Consumer Electronics Co., Ltd.
- Current Assignee Address: JP Tokyo JP Tokyo
- Agency: McDermott Will & Emery LLP
- Priority: JP2009-277141 20091207
- Main IPC: G11B7/00
- IPC: G11B7/00

Abstract:
An optical disc apparatus in which a bias of a focusing error signal is changed to a value according to a recording power at timing corresponding to a predetermined address position before starting the recording and a defocus of an opposite polarity is preliminarily caused so as to set off a defocus which occurs at the start of the recording.
Public/Granted literature
- US20110134731A1 OPTICAL DISC APPARATUS AND DEFOCUS CORRECTING METHOD Public/Granted day:2011-06-09
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