发明授权
US5408452A Optical information recording/reproducing system including novel
tracking system
失效
光信息记录/再现系统包括新颖的跟踪系统
- 专利标题: Optical information recording/reproducing system including novel tracking system
- 专利标题(中): 光信息记录/再现系统包括新颖的跟踪系统
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申请号: US938254申请日: 1992-10-13
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公开(公告)号: US5408452A公开(公告)日: 1995-04-18
- 发明人: Akito Sakemoto , Toshinori Sugiyama , Zenji Tsutsumi , Shigeru Nakamura , Masahiro Ojima
- 申请人: Akito Sakemoto , Toshinori Sugiyama , Zenji Tsutsumi , Shigeru Nakamura , Masahiro Ojima
- 申请人地址: JPX Osaka JPX Tokyo
- 专利权人: Hitachi Maxell, Ltd.,Hitachi Ltd.
- 当前专利权人: Hitachi Maxell, Ltd.,Hitachi Ltd.
- 当前专利权人地址: JPX Osaka JPX Tokyo
- 优先权: JPX2-159892 19900620
- 主分类号: G11B11/10
- IPC分类号: G11B11/10 ; G11B7/09 ; G11B7/095 ; G11B11/105 ; G11B7/00
摘要:
An optical information recording/reproducing system is disclosed in which optical information having guide grooves for tracking and information pits beforehand provided thereon is irradiated with a main light beam for the recording/reproduction of information and a pair of subsidiary light beams for the detection of tracking and the scanning loci of the centers of the subsidiary light beams are arranged on the optical information carrier on opposite sides of the scanning locus of the center of the main light beam, respectively, first and second means for generating electric signals having their amplitudes corresponding to the respective intensities of the subsidiary light beams reflected by the optical information carrier, third means for detecting a difference in amplitude between the electric output signals of the first and second means, fourth means for detecting Ac components of the electric output signals of the first and second means to detect a difference in amplitude between the AC components, and fifth means for selecting a detection output of the third means as tracking information when the subsidiary light beams scan a region on the optical information carrier where the information pits are not provided and selecting a detection output of the fourth means as tracking information when the subsidiary light beams scan a region on the optical information carrier where the information pits are provided.
公开/授权文献
- US4731023A Teaching system using prerecorded tape 公开/授权日:1988-03-15