Laser-power control method, and laser driving device and optical disc apparatus using the method

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	Laser-power control method, and laser driving device and optical disc apparatus using the method
其他题名	Laser-power control method, and laser driving device and optical disc apparatus using the method
	OHGUSHI, TOSHIAKI; KURODA, KAZUTO; USUI, TAKASHI
	2008-05-01
专利权人	KABUSHIKI KAISHA TOSHIBA
公开日期	2008-05-01
授权国家	美国
专利类型	发明申请
摘要	In a laser-power control method, a power of laser light emitted from a laser-light emitting element and a driving current for driving the laser-light emitting element are detected. An approximate expression indicating a driving-current to light-power characteristic of the laser-light emitting element is updated on the basis of the detected light power and the detected driving current while sequentially increasing accuracy. A command driving current corresponding to a target light power is calculated by using the updated approximate expression. The laser-light emitting element is driven on the basis of the calculated command driving current so as to output the target light power.
其他摘要	在激光功率控制方法中，检测从激光发光元件发射的激光的功率和用于驱动激光发光元件的驱动电流。基于检测到的光功率和检测到的驱动电流更新表示激光发光元件的驱动电流至光功率特性的近似表达式，同时依次提高精度。通过使用更新的近似表达式计算对应于目标光功率的命令驱动电流。基于计算出的指令驱动电流驱动激光发光元件，以输出目标光功率。
主权项	A laser-power control method comprising: detecting a power of a laser light emitted from a laser-light emitting element onto an optical disc; detecting a driving current driving the laser-light emitting element; updating an approximate expression on the basis of the detected laser light power and the detected driving current to increase accuracy, the approximate expression indicating a driving-current to light-power characteristic of the laser-light emitting element; calculating a command driving current corresponding to a target light power using the updated approximate expression; and driving the laser-light emitting element on the basis of the calculated command driving current so that the laser-light emitting element outputs the target light power.
申请日期	2007-10-30
专利号	US20080101428A1
专利状态	失效
申请号	US11/929717
公开（公告）号	US20080101428A1
IPC 分类号	H01S5/00 \| G11B7/125
专利代理人	-
代理机构	-
文献类型	专利
条目标识符	http://ir.opt.ac.cn/handle/181661/61463
专题	半导体激光器专利数据库
作者单位	KABUSHIKI KAISHA TOSHIBA
推荐引用方式 GB/T 7714	OHGUSHI, TOSHIAKI,KURODA, KAZUTO,USUI, TAKASHI. Laser-power control method, and laser driving device and optical disc apparatus using the method. US20080101428A1[P]. 2008-05-01.