Optical pickup device and optical disc apparatus

OPT OpenIR > 半导体激光器专利数据库

	Optical pickup device and optical disc apparatus
其他题名	Optical pickup device and optical disc apparatus
	YAMAZAKI, KAZUYOSHI; KAWAMURA, TOMOTO
	2013-07-16
专利权人	HITACHI MEDIA ELECTRONICS CO., LTD.
公开日期	2013-07-16
授权国家	美国
专利类型	授权发明
摘要	An optical pickup device including: a laser diode for emitting laser light; an objective lens which irradiates an optical beam emitted from the laser diode; an actuator which displaces the objective lens in a radius direction of the optical disc; a grating for branches an optical beam reflected by an information recording layer into plural regions; and one photodetector having plural light receiving parts for receiving the branched optical beams, wherein the photodetector has a first light receiving part which detects zero-th order grating diffracted light and plural second light receiving parts which detecting grating diffracted light having an order not less than that of ±first order grating diffracted light; a detected signal of the zero-th order grating diffracted light is defined as a reproduction signal; and a detected signal of the grating diffracted light is defined as a signal for servo controlling.
其他摘要	一种光学拾取装置，包括：用于发射激光的激光二极管;物镜，照射从激光二极管发出的光束;一个致动器，它使物镜沿光盘的半径方向移动;用于分支的光栅，由信息记录层反射成多个区域的光束;一个光电探测器，具有多个用于接收分支光束的光接收部分，其中光电探测器具有检测零级光栅衍射光的第一光接收部分和检测光栅衍射光的多个第二光接收部分，所述光衍射光具有不小于±1级光栅衍射光;将零级光栅衍射光的检测信号定义为再现信号;并且光栅衍射光的检测信号被定义为用于伺服控制的信号。
申请日期	2010-11-29
专利号	US8488425
专利状态	失效
申请号	US12/955269
公开（公告）号	US8488425
IPC 分类号	G11B7/00
专利代理人	-
代理机构	MCDERMOTT WILL & EMERY LLP
文献类型	专利
条目标识符	http://ir.opt.ac.cn/handle/181661/32895
专题	半导体激光器专利数据库
作者单位	HITACHI MEDIA ELECTRONICS CO., LTD.
推荐引用方式 GB/T 7714	YAMAZAKI, KAZUYOSHI,KAWAMURA, TOMOTO. Optical pickup device and optical disc apparatus. US8488425[P]. 2013-07-16.

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