Diaphragm electromagnetic drive device

Details Diaphragm electromagnetic drive device Diaphragm electromagnetic drive device

1990-11-13

1992-08-18

Stephan, Steven L.

Electrical generator or motor structure

Dynamoelectric

Rotary

310156, 310267, 3542711, 354274, H02K 127, H02K 2112, B03B 902

Patent

active

051402122

ABSTRACT:
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.

REFERENCES:
patent: 2141681 (1938-12-01), Brueck
patent: 4045696 (1977-08-01), Lutz et al.
patent: 4047807 (1977-09-01), Okano et al.
patent: 4378146 (1983-03-01), Suzuki et al.
patent: 4390262 (1983-06-01), Hirohata et al.
patent: 4460253 (1984-07-01), Kawai et al.
patent: 4491401 (1985-01-01), Inaba et al.
patent: 4601564 (1986-07-01), Yamamoto
patent: 4731626 (1988-03-01), Kawamoto
patent: 4763150 (1988-08-01), Sumi
patent: 4984972 (1991-01-01), Clausen et al.

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