Electromagnetically driven shutter device for camera

Details Electromagnetically driven shutter device for camera Electromagnetically driven shutter device for camera

1980-06-20

1981-12-01

Griffin, Donald A.

354 51, 354246, G03B 708, G03B 908, G03B 940

Patent

active

043033261

ABSTRACT:
An electromagnetically driven shutter for camera for driving the shutter blades by means of an electromagnetic driving source being characterized in that the current supply circuit to the electromagnetic driving source from the camera power source is provided with a condenser which is normally charged with the output of the camera power source or its step up circuit in such a manner that by means of the driving pulse produced with the shutter release the charge of the condenser is superposed over the power source voltage and delivered to the electromagnetic driving source so as to increase the starting speed of the shutter blades.

REFERENCES:
patent: 3257919 (1966-06-01), Sato et al.
patent: 3950772 (1976-04-01), Nakagawa et al.
patent: 3953867 (1976-04-01), Kondo
patent: 4012751 (1977-03-01), Espig
patent: 4072965 (1978-02-01), Kondo
patent: 4129370 (1978-12-01), Ishiguro et al.

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