发明公开
- 专利标题: Objective lens for optical disk
- 专利标题(中): Objektivlinsefüroptische Platte
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申请号: EP01126496.7申请日: 2001-11-12
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公开(公告)号: EP1209490A2公开(公告)日: 2002-05-29
- 发明人: Itonaga, Makoto , Ito, Fumihiko
- 申请人: VICTOR COMPANY OF JAPAN, LTD.
- 申请人地址: 12, Moriya-Cho 3-Chome, Kanagawa-Ku Yokohama-Shi, Kanagawa-Ken JP
- 专利权人: VICTOR COMPANY OF JAPAN, LTD.
- 当前专利权人: VICTOR COMPANY OF JAPAN, LTD.
- 当前专利权人地址: 12, Moriya-Cho 3-Chome, Kanagawa-Ku Yokohama-Shi, Kanagawa-Ken JP
- 代理机构: HOFFMANN - EITLE
- 优先权: JP2000350144 20001116; JP2001230651 20010730; JP2001230652 20010730
- 主分类号: G02B3/02
- IPC分类号: G02B3/02
摘要:
There is disclosed an objective lens (21, 31, 41) for an optical disk, comprising a bi-aspherical single lens having a numerical aperture of 0.7 or more, wherein a center thickness of the lens is larger than a focal distance.
公开/授权文献
- EP1209490A3 Objective lens for optical disk 公开/授权日:2004-10-06
信息查询
IPC分类:
G | 物理 |
G02 | 光学 |
G02B | 光学元件、系统或仪器 |
G02B3/00 | 简单或复合透镜 |
G02B3/02 | .具有非球面的(G02B3/10优先) |