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	Laser power supply circuit as well as optical recording and/or reading device comprising such a laser power supply circuit
	BIERHOFF, MARTINUS, PETRUS, MARIA; VAN MIL, JOB, FRANSISCUS, PETRUS
	1996-12-11
著作权人	PHILIPS ELECTRONICS N.V.
专利号	EP0746888A1
国家	欧洲专利局
文献子类	发明申请
其他题名	Laser power supply circuit as well as optical recording and/or reading device comprising such a laser power supply circuit
英文摘要	A laser power supply circuit in which the intensity of the laser (1) is controlled by a control loop, the control loop comprising a driving circuit (2) for feeding the laser (1), monitoring means (3) for deriving a measuring signal indicative of the intensity, and a control circuit (4) for deriving a control signal for the driving circuit (2) in response to the measuring signal. A problem in such a feedback laser power supply circuit is that, on switch-on, the supply current may temporarily assume a high value, so that the laser (1) is damaged. If the control circuit (4) comprises, for example, an integrator, a control signal that is too large can be formed herein. Added to the laser power supply circuit is a sensing circuit (6) which senses whether the control loop is in the operational mode. If the control loop has a deviating loop gain, for example, if the driving circuit (2) is in a state of saturation, the sensing circuit (6) will prevent, via the limiting means (7), the control circuit (4) from forming too large a control signal. The invention further relates to a device comprising a laser for recording and/or reading information on a record carrier, comprising such a laser power supply circuit.
公开日期	1996-12-11
申请日期	1995-11-23
状态	失效
内容类型	专利
源URL	[http://ir.opt.ac.cn/handle/181661/59986]
专题	半导体激光器专利数据库
作者单位	PHILIPS ELECTRONICS N.V.
推荐引用方式 GB/T 7714	BIERHOFF, MARTINUS, PETRUS, MARIA,VAN MIL, JOB, FRANSISCUS, PETRUS. Laser power supply circuit as well as optical recording and/or reading device comprising such a laser power supply circuit. EP0746888A1. 1996-12-11.

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