发明授权
- 专利标题: Information recording medium and method for recording information to the same
- 专利标题(中): 信息记录介质以及用于记录信息的方法
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申请号: US288910申请日: 1994-08-11
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公开(公告)号: US5426632A公开(公告)日: 1995-06-20
- 发明人: Shigenori Murakami , Toshihiko Takishita , Kenji Suzuki , Kiyohide Ogasawara , Hiroshi Ito
- 申请人: Shigenori Murakami , Toshihiko Takishita , Kenji Suzuki , Kiyohide Ogasawara , Hiroshi Ito
- 申请人地址: JPX Yamanashi JPX Tokyo
- 专利权人: Pioneer Video Corporation,Pioneer Electronic Corporation
- 当前专利权人: Pioneer Video Corporation,Pioneer Electronic Corporation
- 当前专利权人地址: JPX Yamanashi JPX Tokyo
- 优先权: JPX5-207937 19930823; JPX6-143456 19940624
- 主分类号: G11B3/70
- IPC分类号: G11B3/70 ; G11B7/0045 ; G11B7/24 ; G11B7/248 ; G11B7/257
摘要:
An optical information recording medium recordable of the analogue NTSC color video signal under the conditions of a high S/N ratio and a low jitter, and capable of being played by a commercially available LD player. The medium comprises: a transparent substrate on which pre-grooves are formed with a depth of 1450-2050 angstroms; an optical absorbing layer with an absorbance of 0.7-0.9 made of palladium phthalocyanine dye formed on the substrate, the absorbing layer having pits each having a changed reflectivity being duty-cycle modulated in response to a limited waveform which is formed through the steps of: adding at least one of a second FM carrier and a third pulse carrier to a first FM carrier having a first center frequency and a first frequency band, the second FM carrier having a second center frequency lower than the first center frequency and a second frequency band spaced from the first frequency band, the third pulse carrier having a pulse-repetition frequency lower than the second center frequency and a third frequency band spaced from the second frequency band, to form a frequency-division multiplex signal; and symmetrically clipping the multiplex signal to form the limited waveform; and reflecting layer formed on the optical absorbing layer.
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