发明申请
- 专利标题: OPTICAL PICKUP AND OPTICAL INFORMATION PROCESSING DEVICE
- 专利标题(中): 光学拾取和光学信息处理设备
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申请号: US12531193申请日: 2008-04-15
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公开(公告)号: US20100135130A1公开(公告)日: 2010-06-03
- 发明人: Yukiko Hamano , Hideaki Hirai , Toshimichi Nasukawa , Kazuhiro Umeki
- 申请人: Yukiko Hamano , Hideaki Hirai , Toshimichi Nasukawa , Kazuhiro Umeki
- 优先权: JP2007-116376 20070426; JP2007-286017 20071102
- 国际申请: PCT/JP2008/057783 WO 20080415
- 主分类号: G11B7/00
- IPC分类号: G11B7/00
摘要:
A disclosed optical pickup includes an aberration correction unit with a phase shifter surface. On the phase shifter surface, rectangular or staircase-like steps are formed in a concentric manner around an optical axial center, in certain regions where a light beam passes through. The steps have different heights in the optical axial direction. A light beam having a wavelength of 405 nm is directly transmitted through the steps so that a phase difference is applied for correcting spherical aberration that occurs on a first optical recording medium. A light beam that passes through an annular region without any steps is focused on a second optical recording medium. A light beam that passes through an outside region is focused by an object lens on the second optical recording medium, and is not focused on the first optical recording medium.
公开/授权文献
- US08259555B2 Optical pickup and optical information processing device 公开/授权日:2012-09-04