发明名称 |
Diaphragm device |
摘要 |
In a diaphragm device for use in an optical instrument such as a camera and having two or more diaphragm blades movable across an imaging path of rays and arranged in axially displaced relation from each other to define a common aperture of variable size, there is provided means formed in a portion of at least one of the diaphragm blades to substantially either eliminate or reduce the axial displacement between the diaphragm blades at a relatively small aperture region, whereby the distribution of light energy is made uniform over the entire area of the image.
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申请公布号 |
US4086605(A) |
申请公布日期 |
1978.04.25 |
申请号 |
US19760696548 |
申请日期 |
1976.06.16 |
申请人 |
CANON KABUSHIKI KAISHA |
发明人 |
ISHIKAWA, KAZUO;SAKAGUCHI, KEIICHI;TAKIGAWA, TOMOSHI;HIRATA, NORITSUGU;TAJIMA, AKIRA;TSUJI, SADAHIKO |
分类号 |
G03B19/18;G03B7/10;G03B9/06;(IPC1-7):G03B17/38 |
主分类号 |
G03B19/18 |
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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