发明申请
- 专利标题: Laser focus controlling method on an optical disk and an optical disk apparatus with using thereof
- 专利标题(中): 光盘上的激光聚焦控制方法及其使用的光盘装置
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申请号: US11542273申请日: 2006-10-04
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公开(公告)号: US20070274173A1公开(公告)日: 2007-11-29
- 发明人: Toshio Saitoh , Toshio Shoji
- 申请人: Toshio Saitoh , Toshio Shoji
- 优先权: JP2006-148044 20060529
- 主分类号: G11B7/00
- IPC分类号: G11B7/00
摘要:
In a focus controlling method of a laser beam for an optical disk, achieving a stable focus drawing-in, lowering ill influences due to stray lights, detecting an electric signal, which is obtainable upon basis of a reflection light from the optical disk loaded, in advance, while executing a focus sweep operation of gradually approaching the laser to a recoding surface of the optical disk, at an unnecessary light detection gain being higher than a gain of normal operation, thereby counting a number of signals generated due to unnecessary lights; and thereafter, detecting the electric signal, which is obtainable upon basis of the reflection light from the optical disk loaded, and thereby conducting a focus drawing-in, by considering an electric signal, which is generated just after a number detected thereof reaches to the counted number of signals generated due to the unnecessary lights, to be a signal reflected from the recording surface of the optical disk loaded.