发明名称 |
Control method and control device for laser power of semiconductor laser and recording/reproducing method and recording/reproducing device for magnetooptic recording medium and recording/reproducing method and recording/reproducing device for optical recording medium |
摘要 |
The present invention proposes a method of controlling the laser power of a semiconductor laser that, in this method of controlling the laser power of a semiconductor laser by applying a power source voltage to between the collector and emitter of an output transistor and a serial circuit of the output transistor and a semiconductor laser, enables decreasing the power consumption of the output transistor. The present invention is arranged to apply a variable power source voltage Vcc to a serial circuit of an output transistor (Qb) and a semiconductor laser (SL) and thereby control the variable power source voltage Vcc such that a difference between the variable power source voltage Vcc and the peak hold voltage of an operating voltage of the semiconductor laser (SL) becomes substantially constant.
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申请公布号 |
US2005117615(A1) |
申请公布日期 |
2005.06.02 |
申请号 |
US20020169734 |
申请日期 |
2002.12.12 |
申请人 |
SONY CORPORATION |
发明人 |
FUJIIE KAZUHIKO;TAKESHITA YASUYUKI |
分类号 |
G11B11/105;G11B7/00;G11B7/0045;G11B7/125;H01S5/042;H01S5/062;(IPC1-7):H01S3/00 |
主分类号 |
G11B11/105 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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