Linear motor-driven focal plane shutter

Details Linear motor-driven focal plane shutter Linear motor-driven focal plane shutter

1976-04-15

1977-09-27

Hix, L. T.

354248, G03B 942

Patent

active

040514994

ABSTRACT:
A leading blind and a trailing blind are made of opaque plastic sheet material. Each blind has a thin permanent magnet sealed within it along a plane approximately bisecting its thickness. Along the path of each blind is arranged at least one series of electromagnetic coils. Contactless magnetic or optical means is provided to detect the position of each blind and to sequentially energize the associated series of electromagnetic coils to cause the associated permanent magnet and blind to be driven in the direction in which the coils are sequentially energized in accordance with the principle of a linear motor.

REFERENCES:
patent: 2702500 (1955-02-01), DeBell
patent: 3049982 (1962-08-01), Kendall
patent: 3092002 (1963-06-01), Frenk
patent: 3513763 (1970-05-01), Singer
patent: 3563152 (1971-02-01), Douglas
patent: 3685423 (1972-08-01), Dahlgren

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