发明公开
- 专利标题： An optical head, an optical disk device and an integrated circuit
- 专利标题（中）： 一种光学头，光盘装置以及集成电路装置
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申请号： EP05014799.0申请日： 2005-07-07
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公开(公告)号： EP1632936A3公开(公告)日： 2007-10-10
- 发明人: Yamasaki, Fumitomo , Kadowaki, Shin-ichi , Sano, Kousei , Arai, Akihiro
- 申请人： MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD
- 申请人地址： 1006, Oaza Kadoma Kadoma-shi, Osaka 571-8501 JP
- 专利权人： MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD
- 当前专利权人： MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD
- 当前专利权人地址： 1006, Oaza Kadoma Kadoma-shi, Osaka 571-8501 JP
- 代理机构： TBK-Patent
- 优先权： JP2004251556 20040831
- 主分类号： G11B7/00
- IPC分类号： G11B7/00 ; G11B7/095 ; G11B7/13
摘要：
A light sensing area of a light sensing element 7 is comprised of regions 13, 7a to 7d. A tilt detector 8 carries out a tilt detection in accordance with a first difference signal, which is a difference signal between a signal obtained from the region 7a and a signal obtained from the region 7b, and a second difference signal, which is difference signal between a signal obtained from the region 7c and a signal obtained from the region 7d.
Accordingly, an optical-disk tilt detecting signal having a little influence of defocusing can be obtained even at boundaries between recorded information tracks and non-recorded information tracks.
Accordingly, an optical-disk tilt detecting signal having a little influence of defocusing can be obtained even at boundaries between recorded information tracks and non-recorded information tracks.
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