发明授权
US5737294A Objective lens with two numerical apertures for reading/writing two
optical discs
失效
具有两个数字孔径的物镜，用于读/写两个光盘
- 专利标题： Objective lens with two numerical apertures for reading/writing two optical discs
- 专利标题（中）： 具有两个数字孔径的物镜，用于读/写两个光盘
-
申请号： US607449申请日： 1996-02-27
-
公开(公告)号： US5737294A公开(公告)日： 1998-04-07
- 发明人: Akio Yamakawa , Kamon Uemura
- 申请人： Akio Yamakawa , Kamon Uemura
- 申请人地址： JPX Tokyo
- 专利权人： Sony Corporation
- 当前专利权人： Sony Corporation
- 当前专利权人地址： JPX Tokyo
- 优先权： JPX7-051311 19950310
- 主分类号： G02B13/00
- IPC分类号： G02B13/00 ; G02B3/04 ; G11B7/00 ; G11B7/005 ; G11B7/135 ; G02B3/00
摘要：
An objective lens having at least two regions of different numerical apertures is configured for focusing a light beam through the regions of the different numerical apertures on two different signal recording surfaces of at least two optical discs having light transmitting layers of different thicknesses. Since the objective lens is integrally formed by at least two lens portions, a light beam outgoing from a common light source is focused on signal recording surfaces of at least two optical discs having the light transmitting layers of different thicknesses.
公开/授权文献
- US5184888A Illuminating portion of vanity mirror 公开/授权日：1993-02-09
信息查询
