Laser power control circuit
文献类型：专利
| 作者 | NAKAJIMA JUNJI; MIURA YOSHIO |
| 发表日期 | 1992-04-22 |
| 专利号 | JP1992121836A |
| 著作权人 | HITACHI LTD |
| 国家 | 日本 |
| 文献子类 | 发明申请 |
| 其他题名 | Laser power control circuit |
| 英文摘要 | PURPOSE:To obtain a prescribed recording laser power in a moment by operating only a second counter and performing dense adjustment when a recording laser power is sampled. CONSTITUTION:A current proportional to the emission output of a laser diode 8 flows on a photodiode 9. The current is inputted to an I-V conversion amplifier circuit 18 when a control signal MOC is set at 'H'. The circuit 18 converts the current from the photodiode 9 to a voltage value Vm2, and inputs it to the inversion side of a comparator 20. Meanwhile, the value is compared with a voltage Vref2 that is the voltage value of a reference voltage source 19 and is equivalent to the prescribed recording laser power at the non-inversion input side of the comprator 20. The output COMP of the comparator 20 is inputted as the control signal of up/down counters 13a, 13b, and both counters perform count-up when the COMP is set at 'H' and countdown when it is set at 'L'. Then, coarse adjustment by the first counter 13a and the I-V conversion amplifier circuit, and the dense adjustment by the second counter 13b are performed, which controls both laser powers to prescribed values. |
| 公开日期 | 1992-04-22 |
| 申请日期 | 1990-09-12 |
| 状态 | 失效 |
| 源URL | [http://ir.opt.ac.cn/handle/181661/69112]  |
| 专题 | 半导体激光器专利数据库 |
| 作者单位 | HITACHI LTD |
| 推荐引用方式 GB/T 7714 | NAKAJIMA JUNJI,MIURA YOSHIO. Laser power control circuit. JP1992121836A. 1992-04-22. |
入库方式： OAI收割
来源：西安光学精密机械研究所
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