Camera shutter with a pair of sector drive rings

Details Camera shutter with a pair of sector drive rings Camera shutter with a pair of sector drive rings

1983-06-10

1984-11-06

Mathews, A. A.

354252, G03B 922

Patent

active

044809000

ABSTRACT:
A plurality of sectors start opening in response to operation of a sector opening drive ring, and upon elaspe of a predetermined interval of time to provide a desired exposure time, a sector closing drive ring is released to permit the sectors to start opening, and at the same time the sector opening drive ring is braked until it is stopped, whereupon simultaneous movements of the drive rings are prevented. Therefore, the sectors are opened or closed stably by the operation of either one of the drive rings, assuring an exposure time which is stable and accurate.

REFERENCES:
patent: 2978970 (1961-04-01), Fahlenberg
patent: 3568586 (1971-03-01), Rentschler
patent: 3595154 (1971-07-01), Espig
patent: 3847475 (1974-11-01), Kitai et al.
patent: 4227792 (1980-10-01), Rentschler

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