发明授权
US5457666A Light modulation method for forming a mark in magneto-optical recording
system
失效
用于在磁光记录系统中形成标记的光调制方法
- 专利标题: Light modulation method for forming a mark in magneto-optical recording system
- 专利标题(中): 用于在磁光记录系统中形成标记的光调制方法
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申请号: US114062申请日: 1993-08-31
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公开(公告)号: US5457666A公开(公告)日: 1995-10-10
- 发明人: Tsuyoshi Toda , Hiroshi Ide , Fumiyoshi Kirino , Takeshi Maeda , Hiroyuki Tsuchinaga , Toshimitsu Kaku , Seiichi Mita , Kazuo Shigematsu
- 申请人: Tsuyoshi Toda , Hiroshi Ide , Fumiyoshi Kirino , Takeshi Maeda , Hiroyuki Tsuchinaga , Toshimitsu Kaku , Seiichi Mita , Kazuo Shigematsu
- 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: JPX4-238276 19920907
- 主分类号: G11B7/00
- IPC分类号: G11B7/00 ; G11B7/0045 ; G11B7/0055 ; G11B7/006 ; G11B7/125 ; G11B11/10 ; G11B11/105 ; G11B7/24
摘要:
A magneto-optical disk recording control method using the mark length recording method wherein the marks and gap regions between marks are recorded on the surface of the disk by maintaining a constant temperature distribution during the recording. The laser is driven to a non-recording level in gap regions between marks that exceed a base recording level used for reproduction of the marks. When a mark is recorded, the laser power is increased to a recording power level and after the mark has been recorded, the laser power level is reduced to the base power level, followed by being raised to the gap recording level. Control of the laser is performed by superposing a plurality of pulse trains that are synchronized with respect to a clock having a cycle T. The pulse trains are derived from the code train to be recorded and have pulses with a duration that is an integral multiple of (1/2)T. If the pulse width of the recording code train exceeds 2T, then the laser is controlled to reach a first power level in accordance with pulses of a first pulse train, be reduced to the gap recording level and then raised to a second power level in accordance with a second recording pulse train to maintain the temperature distribution constant during the recording of the mark. For the recording of longer marks, the laser is controlled to vary between the second power level and the gap recording level.
公开/授权文献
- USD432005S Finial 公开/授权日:2000-10-17