发明授权
- 专利标题: Method and apparatus for reproducing an optical signal
- 专利标题(中): 用于再现光信号的方法和装置
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申请号: US09942036申请日: 2001-08-30
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公开(公告)号: US06901036B2公开(公告)日: 2005-05-31
- 发明人: Junji Tominaga , Takashi Nakano , Nobufumi Atoda , Akira Sato , Manami Kuiseko , Takashi Kikukawa
- 申请人: Junji Tominaga , Takashi Nakano , Nobufumi Atoda , Akira Sato , Manami Kuiseko , Takashi Kikukawa
- 申请人地址: JP Tokyo JP Osaka JP Tokyo
- 专利权人: National Institute of Advanced Industrial Science and Technology,Minolta Co., Ltd.,TDK Corporation
- 当前专利权人: National Institute of Advanced Industrial Science and Technology,Minolta Co., Ltd.,TDK Corporation
- 当前专利权人地址: JP Tokyo JP Osaka JP Tokyo
- 代理机构: Morrison & Foerster LLP
- 优先权: JP2000-267009 20000904
- 主分类号: G11B7/005
- IPC分类号: G11B7/005 ; G11B7/013 ; G11B7/13 ; G11B7/135 ; G11B7/00
摘要:
An apparatus for reproducing information stored in an optical recording medium which comprises marks or pits which are arranged at a pitch less than λ/2NA, wherein λ is a wavelength of light used for reproduction and NA is an numerical aperture of an objective lens. The apparatus generally comprises a laser diode, a polarization beam splitter, an objective lens, beam splitters, a low-frequency light detecting system with a photodetector, a high-frequency light detecting system with a photodetector, and a signal processing circuit for combining detection signals from the photodetectors. In the high-frequency light detecting system, before a convergent lens, a shielding band is provided so as to shield the middle of a bundle of rays of reproduction light.
公开/授权文献
- US20020027861A1 Method and apparatus for reproducing an optical signal 公开/授权日:2002-03-07
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