公开(公告)号：EP0940895A4

公开(公告)日：2000-11-02

申请号：EP98900727

申请日：1998-01-22

申请人： SEIKO EPSON CORP

发明人： KONDO TAKAYUKI ,  KANEKO TAKEO ,  MORI KATSUMI

IPC分类号： H01S5/042 ,  H01S5/183 ,  H01S5/42 ,  H01S3/18

CPC分类号： H01S5/423 ,  H01S5/0421 ,  H01S5/0425 ,  H01S5/18311

摘要： A light source of a semiconductor laser beam scanner which has high resolution at the time of scanning, is suitable for emitting a laser beam from the surface, and has a high degree of freedom of mounting is disclosed. A surface emitting semiconductor laser having at least a first mirror (102), an active layer (103), a current constriction layer (113), a contact layer (106) and a second mirror (111) on a semiconductor substrate (101). The current constriction layer (113) is constitued by a stripe-shaped AlAs layer (105) and an aluminum oxide layer (108) so formed as to surround the AlAs layer (105). The contact layer (106) is formed in the shape of comb tooth (109) in a region where it overlaps the aluminum oxide layer, and mutually independent contact electrodes (110) are formed respectively on the upper surfaces of the comb teeth (109) of the contact layer.

公开(公告)号：EP0831472A4

公开(公告)日：1999-05-26

申请号：EP97905472

申请日：1997-03-10

申请人： SEIKO EPSON CORP

发明人： KITAMURA SHOJIRO ,  MORI KATSUMI ,  KONDO TAKAYUKI ,  KANEKO TAKEO ,  ARIMURA TOSHIO

IPC分类号： G11B7/00 ,  G11B7/0037 ,  G11B7/12 ,  G11B7/125 ,  G11B7/135

CPC分类号： G11B7/1353 ,  G11B7/0037 ,  G11B7/123 ,  G11B7/127 ,  G11B7/1381 ,  G11B7/139 ,  G11B2007/0006

摘要： An optical pickup is capable of projecting laser beams having different polarization directions or different divergence angles from laser sources formed in a surface emitting laser array and varying the effective numerical aperture of an optical system provided with an objective lens and the like. The optical pickup has a high-degree compatibility with both a CD-standards optical disk having a low recording density and a large thickness and a DVD-standards optical disk having a high recording density and a small thickness. Furthermore, a plurality of laser sources can be formed in a compact space by adopting the surface emitting laser array, and the numerical aperture of the optical system can be controlled by making a selection of laser beams. Accordingly, it is possible to realize an optical pickup having compatibility by means of an extremely simple construction, and it is also possible to inexpensively provide a small-size high-performance optical pickup.

摘要翻译： 光学拾取器能够将形成在表面发射激光器阵列中的激光源的不同偏振方向或不同发散角的激光束投射并改变设置有物镜等的光学系统的有效数值孔径。 光拾取器具有与具有低记录密度和大厚度的CD标准光盘和具有高记录密度和小厚度的DVD标准光盘的高度兼容性。 此外，通过采用表面发射激光器阵列，可以在紧凑的空间中形成多个激光源，并且可以通过选择激光束来控制光学系统的数值孔径。 因此，可以通过非常简单的结构实现具有兼容性的光学拾取器，并且还可以廉价地提供小尺寸的高性能光学拾取器。