发明公开
EP2287839A4 OPTICAL INFORMATION RECORDING AND REPRODUCING DEVICE, METHOD FOR OPTICALLY RECORDING AND REPRODUCING INFORMATION, OPTICAL INFORMATION RECORDING MEDIUM AND SOLID IMMERSION LENS
审中-公开
光学信息记录和重放设备,方法光学记录和信息记录介质与光信息技术固体浸没透镜的繁殖
- 专利标题: OPTICAL INFORMATION RECORDING AND REPRODUCING DEVICE, METHOD FOR OPTICALLY RECORDING AND REPRODUCING INFORMATION, OPTICAL INFORMATION RECORDING MEDIUM AND SOLID IMMERSION LENS
- 专利标题(中): 光学信息记录和重放设备,方法光学记录和信息记录介质与光信息技术固体浸没透镜的繁殖
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申请号: EP09750356申请日: 2009-05-18
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公开(公告)号: EP2287839A4公开(公告)日: 2012-05-02
- 发明人: NARUMI KENJI , BIRUKAWA MASAHIRO , KOJIMA RIE , ITO EIICHI
- 申请人: PANASONIC CORP
- 专利权人: PANASONIC CORP
- 当前专利权人: PANASONIC CORP
- 优先权: JP2008135130 2008-05-23
- 主分类号: G11B7/095
- IPC分类号: G11B7/095 ; G11B7/09 ; G11B7/135 ; G11B7/1387 ; G11B7/24 ; G11B7/24038 ; G11B7/257 ; G11B7/2578 ; G11B7/258
摘要:
An optical information recording and/or reproducing apparatus comprises: a focusing unit (11) which collects generated near-field light on an optical disc (1); a first detector (17) which receives light reflected by the optical disc (1) and outputs an electric signal according to the quantity of the received light; and a distance control circuit (22) which controls the distance between the focusing unit (11) and a light entrance surface of the optical disc (1), using the electric signal that is output from the first detector (17), and the optical disc (1) has at least N (N is an integer of 2 or greater) number of information layers, and a distance d0 from the light entrance surface to a first information layer which is most distant from the light entrance surface and a distance dn from the light entrance surface to an Nth information layer which is closest to the light entrance surface satisfy the relationship of dn ‰¥ d0 × (1/25). As a result, servo control can be accurately performed regardless which information layer, out of a plurality of information layers of an optical disc, information is recorded to or reproduced from.
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