发明名称 |
Diaphragm device |
摘要 |
A diaphragm device including a pair of diaphragm blades movable in opposite directions relatively to each other along a moving line passing through an optical axis of an optical system characterized in that each of the diaphragm blades is provided with an opening of a shape consisting of combination of an arc having a center of curvature located on said moving line and at least one arc having a radius smaller than the above-mentioned arc and having a center of curvature located on said moving line or on a line at right angle to said moving line.
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申请公布号 |
US4797700(A) |
申请公布日期 |
1989.01.10 |
申请号 |
US19860878605 |
申请日期 |
1986.06.26 |
申请人 |
CANON KABUSHIKI KAISHA |
发明人 |
TSUJI, SADAHIKO;INABA, HIROYOSHI |
分类号 |
G03B9/02;G03B9/42;(IPC1-7):G03B9/02 |
主分类号 |
G03B9/02 |
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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