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	Optical disk apparatus
	FUKUHARA, TAKASHI
	2009-10-22
著作权人	CANON KABUSHIKI KAISHA
专利号	US20090262624A1
国家	美国
文献子类	发明申请
其他题名	Optical disk apparatus
英文摘要	Provided is an optical disk apparatus which optimizes a frequency of a high frequency superimposing operation upon reproduction so that good reproduction performance is realized in a wide irradiation power range of a laser power. The optical disk apparatus includes: a semiconductor laser device; an optical disk discrimination circuit for performing laser discrimination; a driver device including a drive circuit for supplying direct drive current to the semiconductor laser device and a high frequency superimposing circuit for superimposing high frequency current on the drive current; and a high frequency superimposing variable circuit for changing a frequency of the high frequency current in which when information is reproduced, the high frequency superimposing variable circuit sets the frequency of the high frequency current for reproducing a multi-layer disk to be higher than the frequency of the high frequency current for reproducing a single-layer disk.
公开日期	2009-10-22
申请日期	2009-04-06
状态	失效
内容类型	专利
源URL	[http://ir.opt.ac.cn/handle/181661/58420]
专题	半导体激光器专利数据库
作者单位	CANON KABUSHIKI KAISHA
推荐引用方式 GB/T 7714	FUKUHARA, TAKASHI. Optical disk apparatus. US20090262624A1. 2009-10-22.

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