Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1979-06-05
1981-05-05
Griffin, Donald A.
Electrical generator or motor structure
Dynamoelectric
Rotary
310 13, G03B 914, H02K 4100, H02K 4102
Patent
active
042655307
ABSTRACT:
Photographic apparatus for controlling the opening and closing of a photographic shutter. In a preferred embodiment, the apparatus includes a linear motor having a first output for incrementally driving the blades of the shutter from a closed orientation to an open orientation. The linear motor includes a second output which rapidly returns the blades to the closed orientation to terminate the exposure interval. In an alternative embodiment of the invention, the coil of the linear motor is energized in manner so as to create a magnetic field which is in opposition to a magnetic field which exists between two permanent magnets mounted within the linear motor to drive the shutter blades into an open orientation. One of the magnets is fixedly secured in place while the other magnet is the armature of the linear motor and accordingly is connected to the shutter blades. The magnetic poles of the magnets are orientated such that common poles of said magnets face each other thereby providing a force for moving the armature away from the fixed magnet to drive the shutter blades into a closed orientation.
REFERENCES:
patent: 3176170 (1965-03-01), Fulton et al.
patent: 3466993 (1969-09-01), Fahlenberg et al.
patent: 3533346 (1970-10-01), Erlichman et al.
patent: 3619673 (1971-11-01), Helms
patent: 3882522 (1975-05-01), Erlichman
patent: 3922698 (1975-11-01), Petersen
patent: 4121235 (1978-10-01), Fujita et al.
Corrigan Alfred E.
Griffin Donald A.
Polaroid Corporation
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