Optical information recording and reproducing device

OPT OpenIR > 半导体激光器专利数据库

	Optical information recording and reproducing device
其他题名	Optical information recording and reproducing device
	ONISHI KUNIKAZU; INOUE MASAYUKI
	1990-03-19
专利权人	HITACHI LTD
公开日期	1990-03-19
授权国家	日本
专利类型	发明申请
摘要	PURPOSE:To irradiate an optical disk with ellipsoidal and circular light spots at the same time in a single optical path by using a semiconductor laser beam source for emitting a light beam having astigmatism as a light source forming an ellipsoidal spot. CONSTITUTION:Astigmatism is not generated in an oscillating light beam 41 from a semiconductor laser beam source 1 which is such a waveguide structure that an activation area 50 is throughly enclosed by an area 51 having a lower refractive index than the former area. On the other hand, as to the semiconductor laser beam source 2 which is such a structure that an insulation film 54 is stuck on the whole surfaces except a stripe surface part 53 for injecting an electric current, a beam waist 60a in the vertical direction to a conjunction part of an oscillating light beam 42 is conformed with cavity end surface, while a beam waist 60b in the parallel direction is positioned inside the cavity end surface, thus generating the astigmatism in the beam 42. By converging these beams 41 and 42 with the same objective lens 14, the disk 20 can be irradiated by the circular and ellipsoidal spots 31 and 32 respectively. Consequently, the device can be miniaturized, reducing the number of parts.
其他摘要	目的：通过使用半导体激光束源发射具有像散的光束作为形成椭圆光斑的光源，在单个光路中同时照射具有椭圆形和圆形光斑的光盘。组成：在来自半导体激光束源1的振荡光束41中不产生像散，半导体激光束源1是这样的波导结构，即激活区域50被折射率低于前者区域的区域51完全包围。另一方面，对于半导体激光束源2，其是在除了用于注入电流的条纹表面部分53之外的整个表面上粘贴绝缘膜54的结构，在垂直方向上的束腰60a振荡光束42的连接部分与空腔端面一致，而平行方向的光束腰部60b位于空腔端面内，从而在光束42中产生像散。通过将这些光束41和42会聚在一起。在相同的物镜14中，盘20可以分别由圆形和椭圆形斑点31和32照射。因此，该装置可以小型化，减少了部件数量。
申请日期	1988-09-14
专利号	JP1990078031A
专利状态	失效
申请号	JP1988228606
公开（公告）号	JP1990078031A
IPC 分类号	G11B7/125 \| H01S5/00 \| H01S3/18
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/181661/75744
专题	半导体激光器专利数据库
作者单位	HITACHI LTD
推荐引用方式 GB/T 7714	ONISHI KUNIKAZU,INOUE MASAYUKI. Optical information recording and reproducing device. JP1990078031A[P]. 1990-03-19.

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