Optical head device and optical information recoding/reproducing device

OPT OpenIR > 半导体激光器专利数据库

	Optical head device and optical information recoding/reproducing device
其他题名	Optical head device and optical information recoding/reproducing device
	KATAYAMA, RYUICHI
	2008-11-06
专利权人	NEC CORPORATION
公开日期	2008-11-06
授权国家	世界知识产权组织
专利类型	发明申请
摘要	Light outputted from a semiconductor laser (1) is split into a main beam and two sub-beams by a diffraction optical element (3) and are collected to a recording layer of a disc (7). Reflection light of the main beam reflected by the recording layer of the disc (7) and reflection light of the two sub-beams pass through a phase filter (11), and are received by an optical detector (10). The phase filter (11) is provided with a first region and a second region separated by a straight line which passes through an optical axis and corresponds to an information track direction, and a phase difference of 180° is made between light passing through the first region and light passing through the second region. A differential push-pull signal is calculated based on output from the optical detector (10).
其他摘要	从半导体激光器（1）输出的光被衍射光学元件（3）分成主光束和两个子光束，并被收集到光盘（7）的记录层。由盘（7）的记录层反射的主光束的反射光和两个子光束的反射光通过相位滤波器（11），并由光学检测器（10）接收。相位滤波器（11）设置有第一区域和第二区域，第一区域和第二区域由直线分开，该直线穿过光轴并且对应于信息轨道方向，并且在穿过第一区域的光之间形成180°的相位差。区域和光线穿过第二个区域。基于来自光学检测器（10）的输出计算差分推挽信号。
主权项	-
申请日期	2008-03-19
专利号	WO2008132891A1
专利状态	未确认
申请号	PCT/JP2008/055116
公开（公告）号	WO2008132891A1
IPC 分类号	G11B7/13 \| G11B7/135 \| G11B7/09
专利代理人	KUDOH, MINORU
代理机构	-
文献类型	专利
条目标识符	http://ir.opt.ac.cn/handle/181661/58248
专题	半导体激光器专利数据库
作者单位	NEC CORPORATION
推荐引用方式 GB/T 7714	KATAYAMA, RYUICHI. Optical head device and optical information recoding/reproducing device. WO2008132891A1[P]. 2008-11-06.