Electromagnetically operated shutter mechanism

Details Electromagnetically operated shutter mechanism Electromagnetically operated shutter mechanism

1976-09-22

1978-10-17

Gellner, Michael L.

354247, G03B 908

Patent

active

041212355

ABSTRACT:
An electromagnetically operated shutter mechanism comprising first and second shutter members supported for movement in the opposite directions to each other for selectively closing and opening an exposure aperture. Permanent magnets are respectively mounted on the first and second shutter members. Cooperative with these permanent magnets are first and second solenoid coils for driving at least either one of the first and second shutter members accompanying corresponding movement of the other of the first and second shutter members. For energizing the solenoid coils, some electric drive circuits including push-pull amplifiers are also disclosed.

REFERENCES:
patent: 2833968 (1958-05-01), Karlson
patent: 3092002 (1963-06-01), Frenk
patent: 3348462 (1967-10-01), Fahlenberg
patent: 3604330 (1971-09-01), Fahlenberg et al.
patent: 3635141 (1972-01-01), Starp et al.
patent: 3868712 (1975-02-01), Biber
patent: 3962707 (1976-06-01), Galbraith, Jr.
patent: 3969738 (1976-07-01), Johnson et al.

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