发明授权
- 专利标题： Pickup head, information recording method and reproducing method
- 专利标题（中）： 拾音头，信息记录方法和再现方法
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申请号： US13410649申请日： 2012-03-02
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公开(公告)号： US08614936B2公开(公告)日： 2013-12-24
- 发明人: Kazuo Watabe , Hideaki Okano , Takashi Usui , Chikara Tanioka , Akihito Ogawa , Kazuaki Doi
- 申请人： Kazuo Watabe , Hideaki Okano , Takashi Usui , Chikara Tanioka , Akihito Ogawa , Kazuaki Doi
- 申请人地址： JP Tokyo
- 专利权人： Kabushiki Kaisha Toshiba
- 当前专利权人： Kabushiki Kaisha Toshiba
- 当前专利权人地址： JP Tokyo
- 代理机构： Blakely, Sokoloff, Taylor & Zafman LLP
- 优先权： JP2011-048181 20110304
- 主分类号： G11B7/09
- IPC分类号： G11B7/09
摘要：
According to one embodiment, a pickup head includes a plurality of light sources, a first objective lens, second objective lens, a driving unit, a first control unit, a second control unit, light receiving units. The first objective lens focuses a first light beam at a first recording layer. The second objective lens focuses a second light beam at a second recording layer. The driving unit moves the first objective lens and the second objective lens in a first direction and a second direction. The first control unit corrects displacement from target track along the first direction. The second control unit controls a moving direction of a position of the second light spot in the second direction.