发明授权
- 专利标题: Lens barrel
- 专利标题(中): 镜筒
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申请号: US10724714申请日: 2003-12-02
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公开(公告)号: US07019917B2公开(公告)日: 2006-03-28
- 发明人: Norio Sato , Toshiharu Suzuki
- 申请人: Norio Sato , Toshiharu Suzuki
- 申请人地址: JP Tokyo
- 专利权人: PENTAX Corporation
- 当前专利权人: PENTAX Corporation
- 当前专利权人地址: JP Tokyo
- 代理机构: Greenblum & Bernstein, P.L.C.
- 优先权: JP2002-351713 20021203; JP2002-351714 20021203
- 主分类号: G02B15/14
- IPC分类号: G02B15/14 ; G02B5/22 ; G02B26/02 ; H04N5/238 ; G03B21/14
摘要:
A lens barrel includes an optical system including a short focal length for a wide angle of view; and an ND filter in the shape of a disc which is provided on an optical axis of the optical system. An optical density of the ND filter decreases in a direction radially outwards from a center of the ND filter.
公开/授权文献
- US20040109240A1 Lens barrel 公开/授权日:2004-06-10
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