Single lens reflex camera having an electric shutter

Details Single lens reflex camera having an electric shutter Single lens reflex camera having an electric shutter

1974-05-06

1976-07-20

Hix, L. T.

354 51, 354238, G03B 708, G03B 962

Patent

active

039710475

ABSTRACT:
In a single lens reflex camera, a lever responsive to operation of a shutter button initiates timing of an electronic shutter control a predetermined time interval before the shutter is actually opened. The predetermined time interval corresponds to the time elapse between the moment the shutter control changes the current which operates the magnet that holds the shutter open and the moment the magnet actually causes the shutter to close. After this predetermined time interval the shutter is opened, such as by running of the opening screen. After the measured shutter interval has ended, a current in the shutter control changes and operates on a magnet which has been holding the shutter open and causes the magnet to close the shutter, such as by releasing a closing screen.

REFERENCES:
patent: 3641902 (1972-02-01), Kikuchi et al.
patent: 3678826 (1972-07-01), Mori et al.
patent: 3683767 (1972-08-01), Sahara
patent: 3721166 (1973-03-01), Yanagi et al.
patent: 3820131 (1974-06-01), Tanaka

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