Electromagnetically driven slit exposure shutter

Details Electromagnetically driven slit exposure shutter Electromagnetically driven slit exposure shutter

1980-04-23

1981-12-22

Griffin, Donald A.

354 51, 354246, G03B 908, G03B 962, G03B 940

Patent

active

043067980

ABSTRACT:
A slit exposure shutter having the front and rear screens thereof respectively arranged to be driven by a source of an electromagnetic driving force is provided with a minimum slit width insuring means which prevents uneven exposure resulting from difference in travelling speed between the front and rear shutter screens during a high speed shutter operation and particularly prevents a total absence of the slit, the shutter is also provided with a nullifying means which nullifies the insuring means when the shutter screens are on their return travels.

REFERENCES:
patent: 3056341 (1962-10-01), Grey
patent: 3148606 (1964-09-01), Thomas et al.
patent: 3726199 (1973-04-01), Alfredsson et al.
patent: 3744392 (1973-07-01), Dahlgren et al.
patent: 3953867 (1976-04-01), Kondo
patent: 3987473 (1976-10-01), Kondo
patent: 4129370 (1978-12-01), Ishiguro et al.

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