公开(公告)号：EP0608432A4

公开(公告)日：1996-04-10

申请号：EP93914992

申请日：1993-07-13

申请人： SEIKO EPSON CORP

发明人： TAKEKOSHI TARO ,  YONEKUBO MASATOSHI ,  TAKEDA TAKASHI ,  ARIMURA TOSHIO

IPC分类号： G02B5/30 ,  G11B7/09 ,  G11B7/13 ,  G11B7/135 ,  G11B11/105

CPC分类号： G11B11/10543 ,  G02B5/3025 ,  G11B7/094 ,  G11B7/131 ,  G11B7/1353 ,  G11B7/1356 ,  G11B7/1365 ,  G11B7/1381 ,  G11B11/10532 ,  G11B11/10536 ,  G11B2007/13727

摘要： A plurality of slant faces (1419) are formed on a substrate (1406). A polarized optical thin film is formed on the slant faces. The recess defined by the slant faces (1419) is filled with transparent material to form a small composite polarizing element. By this polarizing element, it is possible to detect magneto-optic signals excellent in transmissivity and extinction ratio and high in S/N ratio. Also, this polarizing element serves as the cover of the package (1408) of an optical head which houses a photodetecting element (1409) and a light emitting element (1411) integrally. Also, by use of an optical element having an optical path length adjustment function of varying the optical path length of the outgoing light beam from that of the incoming light beam, it is possible to eliminate the initial offset of the focal point error signals and to omit the adjustment at the same time. In this way, a small, simple and high-performance optical head used for magneto-optic recording and reproducing apparatus can be realized.

公开(公告)号：EP0831471A4

公开(公告)日：1999-11-24

申请号：EP97905471

申请日：1997-03-10

申请人： SEIKO EPSON CORP

发明人： YONEKUBO MASATOSHI ,  ARIMURA TOSHIO ,  MIYAZAWA TAKAO

IPC分类号： G11B7/00 ,  G11B7/005 ,  G11B7/12 ,  G11B7/13 ,  G11B7/135 ,  G11B20/10 ,  G11B7/09

CPC分类号： B82Y10/00 ,  G11B7/005 ,  G11B7/123 ,  G11B7/131 ,  G11B7/133 ,  G11B7/1353 ,  G11B7/1367 ,  G11B7/1381 ,  G11B20/10009 ,  G11B2007/0006 ,  G11B2007/13727

摘要： An optical head and an optical recorder with which data can be recorded/reproduced onto/from a conventional CD-R without a problem and, further, data can be recorded/reproduced onto/from an optical recording medium of DVD standard which meets the requirements of the high recording density by employing a semiconductor laser beam which has a relatively longer wavelength than the track pitch of the optical recording medium and the optical super-resolution technique. Moreover, since a semiconductor laser beam which has a relatively longer wavelength than the track pitch of the optical recording medium can be employed by the optical head and the optical recorder, the limitation of the high density recording can be broken through and the optical pickup device and the optical recorder can record/reproduce data of the high recording density at a low cost and with the high reliability and can meet the requirements of the much higher recording density in future.

摘要翻译： 通过使用相对于光记录介质的轨道间距相对长的波长的半导体激光器和光学超分辨率技术，提供了一种光学头和光学记录装置，其允许诸如记录和再生等处理 来自常规的CD-R，并且处理具有高记录密度的DVD标准的光记录介质。 在本发明的光头和光记录装置中，可以使用相对于光记录介质的轨道间距具有较长波长的半导体激光器。 因此，本发明提供了一种光学头和光学记录装置，其克服了朝向更高密度的努力的限制，允许以高可靠性以低成本记录和再生高记录密度。 本发明还提供一种光头和光学记录装置，能够应付将来更高密度的趋势。

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。