发明授权
- 专利标题： Method and apparatus for optical detection of information
- 专利标题（中）： 信息光学检测方法和装置
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申请号： US828719申请日： 1986-02-12
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公开(公告)号： US4743774A公开(公告)日： 1988-05-10
- 发明人: Takeshi Maeda , Shigeru Nakamura , Hisataka Sugiyama , Kazuo Shigematsu , Atsushi Saito
- 申请人： Takeshi Maeda , Shigeru Nakamura , Hisataka Sugiyama , Kazuo Shigematsu , Atsushi Saito
- 申请人地址： JPX Tokyo
- 专利权人： Hitachi, Ltd.
- 当前专利权人： Hitachi, Ltd.
- 当前专利权人地址： JPX Tokyo
- 优先权： JPX60-55834 19850322
- 主分类号： G11B7/00
- IPC分类号： G11B7/00 ; G11B7/004 ; G11B7/005 ; G11B20/10 ; G06K7/10
摘要：
Method and apparatus for optically detecting information from a recording medium in which pits are formed by thermal energy of a light spot to record the information. A reproduction spot is irradiated onto the recording medium to produce a detection signal. From a differential signal of the detection signal, a signal indicative of zero points of the differential signal and a signal indicative of the presence of the pits are detected, and both the signals are used to detect positions of the pits. For stable and accurate detection of the pit position, the relation between pit size W and reproduction spot size W.sub.s is prescribed and the pit size and reproduction spot size are so set as to satisfy 0.45.ltoreq.W/W.sub.s .ltoreq.0.75.
公开/授权文献
- US5307964A Aerosol extension 公开/授权日：1994-05-03
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