Switching circuit for electric shutter

Details Switching circuit for electric shutter Switching circuit for electric shutter

1975-11-10

1977-07-19

Hix, L. T.

354 60R, 354258, G03B 708

Patent

active

040372367

ABSTRACT:
In an electric shutter including a light measuring circuit for measuring the scene brightness and a comparator connected therewith for providing output voltage which rises from a low level to a high level when a time corresponding to the scene brightness has lapsed, a switching transistor circuit and an electromagnet for holding the trailing shutter blind are connected in parallel between the output of the comparator and the main power switch. When the power switch is turned on, both the switching transistor circuit and the electromagnet are turned on. When the output voltage of the comparator rises up to the high level, the switching transistor circuit and the electromagnet are turned off.

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