发明申请
- 专利标题: OPTICAL DISC DEVICE AND FOCUS CONTROL METHOD
- 专利标题(中): 光盘设备和聚焦控制方法
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申请号: US12452672申请日: 2009-05-25
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公开(公告)号: US20100195453A1公开(公告)日: 2010-08-05
- 发明人: Hirotaka Miyamoto , Kimihiro Saito , Kunihiko Hayashi
- 申请人: Hirotaka Miyamoto , Kimihiro Saito , Kunihiko Hayashi
- 申请人地址: JP TOKYO
- 专利权人: SONY CORPORATION
- 当前专利权人: SONY CORPORATION
- 当前专利权人地址: JP TOKYO
- 优先权: JP2008-137025 20080526
- 国际申请: PCT/JP2009/059927 WO 20090525
- 主分类号: G11B7/00
- IPC分类号: G11B7/00
摘要:
Disclosed is an optical disc device that is able to increase accuracy in reproducing information from an optical disc. The optical disc device 10 calculates a focus error signal SFE2 and a sum signal SS1 while reciprocating an objective lens 21 in a focus direction until a distance between a focal point FS and a focal point FM1 becomes close to the depth d of a target position PG at the time of a pull-in operation, and when a trigger signal ST1 generated on the basis of the sum signal SS1 is at low level, starts focus control on the basis of the focus error signal SFE2. Therefore, focus control can start in a state where the focus error signal SFE2 curves in an S shape with sufficient amplitude.
公开/授权文献
- US08274875B2 Optical disc device and focus control method 公开/授权日:2012-09-25
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