发明授权
US5344683A Optical information recording medium with phase grooves in land portions
of information recording areas
失效
在信息记录区域的陆地部分中具有相位凹槽的光学信息记录介质
- 专利标题： Optical information recording medium with phase grooves in land portions of information recording areas
- 专利标题（中）： 在信息记录区域的陆地部分中具有相位凹槽的光学信息记录介质
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申请号： US44645申请日： 1993-04-08
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公开(公告)号： US5344683A公开(公告)日： 1994-09-06
- 发明人: Akihiko Shimizu
- 申请人： Akihiko Shimizu
- 申请人地址： JPX Tokyo
- 专利权人： Ricoh Company, Ltd.,
- 当前专利权人： Ricoh Company, Ltd.,
- 当前专利权人地址： JPX Tokyo
- 优先权： JPX1-280420 19891027
- 主分类号： G11B7/013
- IPC分类号： G11B7/013 ; G11B7/26 ; B32B3/00
摘要：
An optical information recording medium for a land recording method in which information recording pits are formed in a recording layer provided in a land portion between adjacent guide grooves with the application of a laser beam to the recording layer, is composed of a substrate and a recording layer formed thereon. The substrate includes preformed prepits thereon as preformat information in a space along a track center, which includes flag marks and preformed phase grooves, and the decrease in the output of Rf signals generated by the phase grooves is smaller than a half of the amplitude of Rf signals detected by the presence or absence of the prepits.
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