发明申请
- 专利标题: Optical recording/reproducing method and optical recording medium
- 专利标题(中): 光记录/再现方法和光记录介质
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申请号: US10503265申请日: 2003-02-06
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公开(公告)号: US20050068854A1公开(公告)日: 2005-03-31
- 发明人: Kazutomo Miyata , Teruyuki Ota , Makoto Watanabe , Yoshihito Fukushima
- 申请人: Kazutomo Miyata , Teruyuki Ota , Makoto Watanabe , Yoshihito Fukushima
- 优先权: JP2002-30032 20020206
- 国际申请: PCT/JP03/01246 WO 20030206
- 主分类号: G11B7/007
- IPC分类号: G11B7/007 ; G11B11/105 ; G11B11/00 ; G11B7/24
摘要:
An optical recording and reproducing method is able to record and reproduce information by using an optical system using recording and reproducing light with a wavelength selected in a range of from 780 nm±10 nm and an objective lens with a numerical aperture NA selected in a range of from 0.45±0.01 and records and reproduces first and second optical recording mediums having different recording capacities. The first optical recording medium is constructed by using a substrate with a track pitch Tp1 being selected in a range of from 1.5 μm to 1.7 μm and a groove depth d1 being selected in a range of from 70 nm to 90 nm, and the second optical recording medium is constructed by using a substrate 11 with a track pitch Tp2 being selected in a range of from 1.2 μm to 1.3 μm and a groove depth d2 of the groove 12 being selected in a range of from 150 nm to 180 nm. This, the optical recording medium has compatibility with existing optical discs and has a recording density high enough to record a moving picture.
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