发明名称 |
Diaphragm electromagnetic drive device |
摘要 |
A diaphragm electromagnetic drive device which comprises ring-shaped rotor and stator disposed coaxially about the optical axis of a taking lens and in which the rotor is rotated to thereby rotate diaphragm blades so as to vary successively a diaphragm diameter defined by the diaphragm blades. The mutually opposed surfaces of the rotor and stator are constructed respectively in the shape of a side surface of a truncated cone, so that the areas of the opposed surfaces can be increased without increasing the outside diameter and the length in the optical axis direction of the electromagnetic drive device.
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申请公布号 |
US5140212(A) |
申请公布日期 |
1992.08.18 |
申请号 |
US19900611635 |
申请日期 |
1990.11.13 |
申请人 |
FUJI PHOTO FILM CO., LTD. |
发明人 |
IWASAKI, HIROYUKI;KAYANUMA, YASUNOBU |
分类号 |
G03B9/02;H02K1/27;H02K5/173;H02K21/12;H02K33/16 |
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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