Patent
1976-04-06
1977-10-11
Hix, L. T.
G03B 934
Patent
active
040539130
ABSTRACT:
An electric shutter device for a focal plane shutter of a type having a notched gear to disconnect, upon completion of shutter charging, the connection between the winding system and a front curtain member to engageably stop a shutter front curtain in a state of the shutter being charged, a control member having a counterpart gear to be meshed with the notched gear, and engaged with the shutter travelling system in the rotational direction at the time of shutter charging, and becoming disengaged with the shutter travelling system in the rotational direction at the time of shutter release, a return spring on the control member, an engagement member to engageably stop the control member in a state of shutter charge, whereby at the time of shutter charging, the energizing force of the return spring is augmented by the rotation of the control member and, by the shutter release operation, the engagement of the engagement member is first released to cause the control member alone to rotationally return to its original position by the return spring and, at the end period of the rotational return of the control member, the engagement of the front curtain member is released to cause the shutter front curtain to run.
REFERENCES:
patent: 3759156 (1973-09-01), Kobori
patent: 3821757 (1974-06-01), Kobori
Gellner M. L.
Hix L. T,.
Nippon Kogaku K.K.
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