Magnetically controlled shutter

Details Magnetically controlled shutter Magnetically controlled shutter

1981-08-14

1983-07-19

Gellner, Michael L.

G03B 962

Patent

active

043940811

ABSTRACT:
Disclosed is a magnetically controlled focal plane shutter wherein one electromagnet controls a leading shutter curtain and another electromagnet controls a following shutter curtain by releasing respective checking members as power is supplied thereto. The electromagnetic characteristics of the electromagnet that controls the following shutter curtain differ from those of the electromagnet controlling the leading shutter curtain. According to a specific embodiment disclosed, the follower-curtain controlling electromagnet saturates earlier than the leading curtain controlling magnet so as to compensate for deterioration of an energizing battery and thereby limits the problem of shutter time lag resulting from the long battery use.

REFERENCES:
patent: 3947857 (1976-03-01), Kiyoshi et al.
patent: 4315678 (1982-02-01), Tsunefuji

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