发明授权
- 专利标题： Three-dimensional recording and reproducing apparatus
- 专利标题（中）： 三维记录和再现设备
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申请号： US958162申请日： 1992-10-08
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公开(公告)号： US5414451A公开(公告)日： 1995-05-09
- 发明人: Hisataka Sugiyama , Takeshi Maeda , Kiyoshi Matsumoto , Motoyasu Terao , Shigenori Okamine , Tetsuya Nishida , Harukazu Miyamoto
- 申请人： Hisataka Sugiyama , Takeshi Maeda , Kiyoshi Matsumoto , Motoyasu Terao , Shigenori Okamine , Tetsuya Nishida , Harukazu Miyamoto
- 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： JPX3-263561 19911011
- 主分类号： G11B7/00
- IPC分类号： G11B7/00 ; G11B7/007 ; G11B7/003 ; G11B7/004 ; G11B7/0065 ; G11B7/09 ; G11B7/135 ; G11B7/14 ; G11B7/20 ; G11B7/24 ; B41J2/435
摘要：
In a three-dimensional recording and reproducing apparatus having a recording medium including a plurality of recording layers stacked on a substrate and an optical system for converging a light irradiated from the substrate side on each of the plurality of recording layers to three-dimensionally record and reproduce information, the following equation is satisfied:.lambda./4.ltoreq.(1/8/NB)(1 /NB.sup.2 -1)NAF.sup.4 .DELTA.dwhere.lambda.: Wavelength of the light;NB: Refractivity of the substrate;NAF: Numerical aperture of a focus lens for converging a light;.DELTA.d: Positional range in the optical axis direction in which exists a recording layer on which the light is to be converged.A light spot is focused on each layer of the multi-layer structured disc to record and reproduce highly reliable data in a high density.
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