Method for controlling the current of laser diode on thermally assisted magnetic recording head
文献类型：专利
| 作者 | SHIMAZAWA, KOJI |
| 发表日期 | 2013-02-05 |
| 专利号 | US8369191 |
| 著作权人 | TDK CORPORATION |
| 国家 | 美国 |
| 文献子类 | 授权发明 |
| 其他题名 | Method for controlling the current of laser diode on thermally assisted magnetic recording head |
| 英文摘要 | A hard disk drive includes a recording medium and a thermally assisted type magnetic head. The controller determines one output current of a photodiode as a first saturated output current, the one output current being defined where temperature measured by a temperature sensor is a first temperature and where signal-to-noise-ratio (SNR) of the reproducing signal current of the reproducing element is saturated with respect to an increase in output current of the photodiode, and another output current of the photodiode as a second saturated output current, the another output current being defined where temperature measured by the temperature sensor is a second temperature, which is different from the first temperature, and where SNR of the reproducing signal current of the reproducing element is saturated with respect to an increase in the output current of the photodiode. A target saturated output current at operation temperature is estimated from operation temperature measured by the temperature sensor during the hard disk device operation, the first and second temperatures, and the first and second saturated output currents; and the driving current of the laser diode is controlled in order to obtain the estimated target saturated output current. |
| 公开日期 | 2013-02-05 |
| 申请日期 | 2010-11-29 |
| 状态 | 授权 |
| 源URL | [http://ir.opt.ac.cn/handle/181661/32893]  |
| 专题 | 半导体激光器专利数据库 |
| 作者单位 | TDK CORPORATION |
| 推荐引用方式 GB/T 7714 | SHIMAZAWA, KOJI. Method for controlling the current of laser diode on thermally assisted magnetic recording head. US8369191. 2013-02-05. |
入库方式： OAI收割
来源：西安光学精密机械研究所
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