Moving magnet type instrument

Details Moving magnet type instrument Moving magnet type instrument

1976-05-11

1977-09-06

Harris, George

Electricity: magnetically operated switches, magnets, and electr

Magnets and electromagnets

With magneto-mechanical motive device

324146, H01F 708

Patent

active

040471365

ABSTRACT:
For driving exposure control vanes in photographic equipment in response to ariations in the quantity of light, a moving magnet type instrument has a magnet which is positioned proximate a fixed field coil wound on a two piece frame. The magnet is formed as a unitary component of magnetic material and plastic material interlocked against separation, and is arranged for displacement in bearings in the frame proximate which a magnet biassing material is arranged to urge the magnet into a position whereby the supported vane is maintained at a relatively constant spacing with respect to a fixed camera component.

REFERENCES:
patent: 2968000 (1961-01-01), Pfeffer
patent: 3327208 (1967-06-01), Allen
patent: 3753107 (1973-08-01), Burgett et al.
patent: 3761731 (1973-09-01), Burgett et al.

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