Electromagnetically driven shutter

Details Electromagnetically driven shutter Electromagnetically driven shutter

1980-11-18

1982-03-23

Griffin, Donald A.

354246, G03B 908, G03B 940

Patent

active

043209505

ABSTRACT:
In the shutter disclosed, a conductor and a permanent magnet, movable relative to each other, form a driver to drive at least one shutter blade across an optical path for photographic light and the force of the driver is supplemented by an auxiliary spring arrangement that exerts zero force at the start of movement of the shutter blade and gradually increases toward termination of movement of the blade.

REFERENCES:
patent: 3217624 (1965-11-01), Webb
patent: 3466993 (1969-09-01), Fahlenberg et al.
patent: 3922698 (1975-11-01), Petersen
patent: 4001844 (1977-01-01), McClintock
patent: 4220409 (1980-09-01), Inoue

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