发明名称 |
Laser driver, optical disk apparatus using the same, and laser control method |
摘要 |
An optical disk apparatus uses a laser driver which can measure the frequency of the high-frequency superimposed current of the semiconductor laser simply and accurately. The apparatus includes a semiconductor laser which emits a laser beam onto the optical disk, a laser driver which drives the semiconductor laser with a current, with the high-frequency current being superimposed thereon, and measures the frequency of the high-frequency current, and a main controller which controls the frequency of the high-frequency current produced by the laser driver by using the frequency measured by the laser driver.
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申请公布号 |
US2005030989(A1) |
申请公布日期 |
2005.02.10 |
申请号 |
US20040937908 |
申请日期 |
2004.09.09 |
申请人 |
HITACHI, LTD.;HITACHI-LG DATA STORAGE, INC. |
发明人 |
NIHEI MAKOTO;KAKU TOSHIMITSU;ASADA AKIHIRO;HOSHINO TAKASHI |
分类号 |
G11B7/125;H01S5/062;H01S5/0687;(IPC1-7):H01S3/00;H01S3/10 |
主分类号 |
G11B7/125 |
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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