发明申请
- 专利标题： Optical pickup
- 专利标题（中）： 光学拾音
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申请号： US11826245申请日： 2007-07-13
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公开(公告)号： US20080101202A1公开(公告)日： 2008-05-01
- 发明人: Masahiko Nishimoto , Masayuki Ono , Hiroaki Yamamoto
- 申请人： Masahiko Nishimoto , Masayuki Ono , Hiroaki Yamamoto
- 优先权： JP2006-295258 20061031
- 主分类号： G11B7/09
- IPC分类号： G11B7/09
摘要：
An optical pickup includes a hologram element divided into four regions in a direction parallel to a tracking direction of an optical information recording medium and a direction perpendicular thereto. The hologram element allows two pairs of diffracted lights from two paired regions adjacent in parallel with the tracking direction to be made incident into light receiving elements so as to align in the direction perpendicular to the tracking direction.