发明授权
- 专利标题： Optical card
- 专利标题（中）： 光卡
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申请号： US121041申请日： 1987-11-16
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公开(公告)号： US4972402A公开(公告)日： 1990-11-20
- 发明人: Kyo Miura , Hisaaki Kawade , Yoshihiro Ogawa
- 申请人： Kyo Miura , Hisaaki Kawade , Yoshihiro Ogawa
- 申请人地址： JPX Tokyo
- 专利权人： Canon Kabushiki Kaisha
- 当前专利权人： Canon Kabushiki Kaisha
- 当前专利权人地址： JPX Tokyo
- 优先权： JPX61-275357 19861120; JPX62-179126 19870720
- 主分类号： G11B3/70
- IPC分类号： G11B3/70 ; G11B7/0033 ; G11B7/09 ; G11B7/24
摘要：
An optical card has a track portion and a track groove portion as the guide groove on a substrate which can be irradiated with coherent light in shape of a spot to detect the tracking signal from its reflected light, characterized in that the reflectance at the track groove portion is formed lower than the reflectance at the track portion.
公开/授权文献
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