发明授权
US07474603B2 Optical information recording method, apparatus, and medium, laser control circuit, wobble signal detection method, and servo signal detection method
失效
光信息记录方法,装置和介质,激光控制电路,摆动信号检测方法和伺服信号检测方法
- 专利标题: Optical information recording method, apparatus, and medium, laser control circuit, wobble signal detection method, and servo signal detection method
- 专利标题(中): 光信息记录方法,装置和介质,激光控制电路,摆动信号检测方法和伺服信号检测方法
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申请号: US10650814申请日: 2003-08-29
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公开(公告)号: US07474603B2公开(公告)日: 2009-01-06
- 发明人: Hiroshi Maegawa
- 申请人: Hiroshi Maegawa
- 申请人地址: JP Tokyo
- 专利权人: Ricoh Company, Ltd.
- 当前专利权人: Ricoh Company, Ltd.
- 当前专利权人地址: JP Tokyo
- 代理机构: Dickstein Shapiro LLP
- 优先权: JP2002-259179 20020904; JP2002-346800 20021129; JP2002-346820 20021129
- 主分类号: G11B7/00
- IPC分类号: G11B7/00
摘要:
A multilevel information recording apparatus is disclosed, which includes a control unit that inputs signals to a strategy generating unit and a laser drive unit based on the multilevel information being recorded, a signal indicating the playback and recording state, and a clock signal indicating the cell frequency that is in synch with the multilevel information. The strategy generating unit generates a pulse signal in accordance with the timing of the laser beam emission of a write pulse, an off pulse, a bias pulse, and a space pulse based on the signal from the control unit and the clock signal. The laser drive unit determines the driving current of a laser light source based on a delayed playback signal/delayed recording signal that is obtained by delaying the playback signal/recording signal for a processing time of the strategy generating unit, a pulse signal from the strategy generating unit indicating the emission timing of the pulses, and an intensity signal predetermined for each pulse.
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