发明授权
- 专利标题: Information reproducing apparatus for optical disc
- 专利标题(中): 用于光盘的信息再现装置
-
申请号: US868623申请日: 1997-06-04
-
公开(公告)号: US5768232A公开(公告)日: 1998-06-16
- 发明人: Eiji Muramatsu , Akiyoshi Inoue , Shoji Taniguchi
- 申请人: Eiji Muramatsu , Akiyoshi Inoue , Shoji Taniguchi
- 申请人地址: JPX Tokyo-to
- 专利权人: Pioneer Electronic Corporation
- 当前专利权人: Pioneer Electronic Corporation
- 当前专利权人地址: JPX Tokyo-to
- 优先权: JPX7-016298 19950202
- 主分类号: G11B7/00
- IPC分类号: G11B7/00 ; G11B7/005 ; G11B7/095 ; G11B7/125 ; G11B20/18
摘要:
An information reproducing apparatus for reproducing information recorded on an information track formed on an information record surface of an optical disc, is provided with: a light irradiation device for irradiating the information record surface with a plurality of light beams including a first light beam, to which a coma aberration is not given, and at least one second light beam, to which a predetermined coma aberration for cancelling a coma aberration due to a tilt of the information record surface in a direction perpendicular to the information track is given, such that the first light beam and the second light beam form light spots arranged along the information track; a first photo-detector for detecting a first reflection light from the information record surface and generating a first light detection signal; a second photo-detector for detecting a second reflection light from the information record surface and generating a second light detection signal; a tilt detection device for detecting a tilt of the information record surface and outputting a tilt signal; and a selection device for selecting one of the first and second light detection signals which has a less coma aberration according to the tilt signal. The information is reproduced on the basis of the selected one of the first and second light detection signals.
公开/授权文献
- US5421721A Dental forceps 公开/授权日:1995-06-06
信息查询
IPC分类: