Electromagnetic focal plane shutter

Details Electromagnetic focal plane shutter Electromagnetic focal plane shutter

1974-11-26

1976-10-19

Adams, Jr., Russell E.

354 50, 354238, 354246, 354247, 354248, 354249, G03B 908

Patent

active

039874737

ABSTRACT:
A leading blind and a trailing blind are made of rigid material such as metal sheet and each is provided with at least one permanent magnet. Along the path of the blinds are arranged electromagnetic coils. Each magnet mounted on the blind has a brush which is in slidable contact with the contacts connected with the electromagnetic coils. The magnet on the blind and the electromagnetic coils arranged in a line along the path of the blind constitute a linear motor to drive the blind. The coils are connected with an exposure control circuit and are energized to drive the blind. The leading blind is driven upon depression of a shutter release button and the trailing blind is driven when a time determined by the exposure control circuit has lapsed. In a preferred embodiment of the invention, the blind is divided into a driving blade and a follower blade to save the space occupied by the blind.

REFERENCES:
patent: 2572229 (1951-10-01), Willcox
patent: 3116670 (1974-01-01), Ball
patent: 3124049 (1964-03-01), Ball
patent: 3513763 (1970-05-01), Singer
patent: 3628434 (1971-12-01), Leitz et al.

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