Electricity: magnetically operated switches – magnets – and electr – Electromagnetically actuated switches – Retarded or delayed type
Patent
1993-12-06
1994-08-09
Gellner, Michael L.
Electricity: magnetically operated switches, magnets, and electr
Electromagnetically actuated switches
Retarded or delayed type
3542341, 3542711, 335219, G03B 904, G03B 908
Patent
active
053371100
ABSTRACT:
An electromagnetic actuator that utilizes magnetic attractive and repulsive forces through the interaction of permanent magnetic and electromagnetic fields for moving an aperture/shutter blade or an aperture blade for setting the aperture for an exposure of an image through an imaging aperture. The actuator includes a base for supporting two permanent magnets which are arranged to rotate on a common axis in opposition to each other and under the influence of forward and reverse direction magnetic fields generated by an armature in response to respective forward and reverse direction currents. The first and second magnets are coupled to a blade at first and second pivot points, respectively, which pivot the blade from a stable rest position of said blade with respect to the imaging aperture to first and second aperture setting positions in response to prescribed rotation of the first and second magnets within defined limits. At least two aperture setting positions are provided by applying the forward and reverse drive current to the electromagnet coil in a mono-stable mode, whereby the blade moves to its rest position on removal of the drive current and where the blade operates as a shutter in the stable rest position.
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Eastman Kodak Company
Gellner Michael L.
Han J. K.
Howley David A.
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