Light receiving and emitting compound element and optical pick-up device using the same

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	Light receiving and emitting compound element and optical pick-up device using the same
其他题名	Light receiving and emitting compound element and optical pick-up device using the same
	TANAKA, HARUO; TSUMORI, MASAHIKO
	2001-07-12
专利权人	ROHM CO., LTD.
公开日期	2001-07-12
授权国家	美国
专利类型	发明申请
摘要	A light emitting portion (1) and an objective lens (3) for collecting a light of the light emitting portion are provided. The light receiving portion (2) is provided in the vicinity of the light emitting portion (1) such that the light can be collected by the objective lens and the light reflected by an optical disk (10) to be an object can be detected. The light emitting portion and the light receiving portion are formed to get in a range of 22 lambd/NA (beam waist BW) wherein a numerical aperture of the objective lens is represented by NA and a wavelength of the light emitting portion is represented by lambd or the light receiving portion is multi-split such that a focal shift of a beam having an astigmatism formed thereon can be detected. As a result, it is possible to obtain a light receiving and emitting compound element capable of surely detecting a focal position without adjusting a positional relationship between the light emitting portion and the light receiving portion and an optical pick-up device capable of being easily assembled and of detecting and correcting a shift in a focus or a tracking with a high sensitivity.
其他摘要	提供发光部分（1）和用于收集发光部分的光的物镜（3）。光接收部分（2）设置在光发射部分（1）附近，使得光可以被物镜聚集，并且可以检测由作为物体的光盘（10）反射的光。光发射部分和光接收部分形成为在22λ/ nm（光束腰宽度BW）的范围内，其中物镜的数值孔径由NA表示，发光部分的波长由lambd或者光接收部分是多分割的，使得可以检测其上形成有象散的光束的焦点偏移。结果，可以获得能够在不调整发光部和光接收部之间的位置关系的情况下可靠地检测焦点位置的光接收和发射复合元件，以及能够容易地组装的光学拾取装置并且以高灵敏度检测和校正聚焦或跟踪的偏移。
主权项	A light receiving and emitting compound element comprising: a light emitting portion to irradiate a light toward an object through an objective lens for collecting the light; and a light receiving portion to detect the light collected by said objective lens and reflected by said object and to check a positional relationship between said objective lens and said object based on an intensity of the detected light; wherein said light emitting portion and said light receiving portion are provided within a range of 22 .lambda./NA, in which a numerical aperture of the objective lens is represented by NA and a wavelength of the light of said light emitting portion is represented by .lambda., and an intensity of the reflected light can be detected by said light receiving portion.
申请日期	2001-01-05
专利号	US20010007543A1
专利状态	授权
申请号	US09/754381
公开（公告）号	US20010007543A1
IPC 分类号	G11B7/135 \| G11B7/09 \| G11B7/12 \| G11B7/123 \| G11B7/1372 \| H01L31/10 \| H01S5/026 \| H01S5/183 \| G11B7/095
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/181661/60570
专题	半导体激光器专利数据库
作者单位	ROHM CO., LTD.
推荐引用方式 GB/T 7714	TANAKA, HARUO,TSUMORI, MASAHIKO. Light receiving and emitting compound element and optical pick-up device using the same. US20010007543A1[P]. 2001-07-12.