发明名称 |
Movable lens hood mechanism of a zoom lens |
摘要 |
A movable lens hood mechanism of a zoom lens includes a plurality of lens groups guided linearly in a direction of an optical axis to change a focal length of the zoom lens; a first cam barrel rotatably driven to move the plurality of lens groups in the optical axis direction; a movable hood barrel having a photographic aperture positioned in front of the frontmost lens group and guided linearly in the optical axis direction; and a feed mechanism which drives the movable hood barrel forward/rearward in the optical axis direction relative to the frontmost lens group by rotation of the first cam barrel so that a space between the photographic aperture of the movable lens hood and the frontmost lens group in the optical axis direction varies in accordance with a variation of a focal length of the zoom lens.
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申请公布号 |
US6657794(B2) |
申请公布日期 |
2003.12.02 |
申请号 |
US20010772872 |
申请日期 |
2001.01.31 |
申请人 |
PENTAX CORPORATION |
发明人 |
NOMURA HIROSHI;AOKI NOBUAKI;YAMAZAKI YOSHIHIRO;NAKAMURA SATORU |
分类号 |
G02B7/04;G02B7/10;G03B11/04;(IPC1-7):G02B15/14 |
主分类号 |
G02B7/04 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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