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	Laser diode drive circuit
	TANAKA TOMONORI
	1992-06-25
著作权人	RICOH CO LTD
专利号	JP1992179176A
国家	日本
文献子类	发明申请
其他题名	Laser diode drive circuit
英文摘要	PURPOSE:To enable a laser diode drive circuit to be simplified in circuit structure and manufactured at a low cost by a method wherein a pull-up resistor and an output terminal of an open collector are connected to the base of a transistor, and a voltage applied to the pull-up resistor is set variable. CONSTITUTION:A voltage applied to a pull-up resistor 7 is made variable through a photodiode 3, an APC control circuit 10, and a voltage variable circuit 8, whereby a transistor 5 becomes apparently variable in operation level, therefore a laser diode 2 can be changed in duty of optical output. For instance, in a write control circuit 9, the emitted light volume of the laser diode 2 is monitored by a photodiode 3 when pulses of 50% ON/OFF are inputted into a video signal/VIDEO, and the APC control circuit 10 feeds back its output to the voltage variable circuit 8 through the intermediary of a control wire 12 so as to set the average emission light volume of the diode 2 to 50% of its emission peak, whereby the laser diode 2 can be kept constant in duty of optical output.
公开日期	1992-06-25
申请日期	1990-11-09
状态	失效
内容类型	专利
源URL	[http://ir.opt.ac.cn/handle/181661/59695]
专题	半导体激光器专利数据库
作者单位	RICOH CO LTD
推荐引用方式 GB/T 7714	TANAKA TOMONORI. Laser diode drive circuit. JP1992179176A. 1992-06-25.

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