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	Information reproducer using semiconductor laser
	FUJISHIMA TOORU; GOTOU TOSHIHIKO
	1984-11-02
著作权人	HITACHI SEISAKUSHO KK
专利号	JP1984193554A
国家	日本
文献子类	发明申请
其他题名	Information reproducer using semiconductor laser
英文摘要	PURPOSE:To suppress the variance of ON/OFF state by discontinuing the application of ON/OFF signal of a high frequency, detecting the answer information of a means which controls the mean output of a laser, and controlling the level of the high frequency signal based on the detected answer information. CONSTITUTION:A gate pulse 8 is applied to a voltage control circuit 16 for a fixed period within a vertical flyback time formed by the vertical synchronizing signal of a reproduced video signal. Thus the oscillation of a period oscillating circuit 17 is stopped. A system covering a monitor photodetector 11 through a yoke coil 15 forms an automatic light quantity control mechanism. Then a pulse having a duty cycle of the gate pulse period is obtained at the output of an amplifier 12. This pulse signal is clamped with peak wave detection by a capacitor 19, and diodes 20a and 20b. Thus a DC control signal corresponding to the variation range of the mean light quantity is obtained between terminals of a smoothing capacitor. This control signal is compared with the reference voltage contained in the circuit 16. Then the voltage applied to the circuit 17 is controlled by the difference information obtained from the above-mentioned comparison.
公开日期	1984-11-02
申请日期	1983-04-15
状态	失效
内容类型	专利
源URL	[http://ir.opt.ac.cn/handle/181661/59324]
专题	半导体激光器专利数据库
作者单位	HITACHI SEISAKUSHO KK
推荐引用方式 GB/T 7714	FUJISHIMA TOORU,GOTOU TOSHIHIKO. Information reproducer using semiconductor laser. JP1984193554A. 1984-11-02.

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