Electric shutter device for a focal plane shutter

In a focal plane shutter device having:

• film winding means;
• shutter moving means including a front curtain interlocking part interlocked with a shutter front curtain energized for movement in the operational direction for shutter release and a rear curtain interlocking part interlocked with a shutter rear curtain energized for movement in the same direction as that of said front curtain;
• a front curtain member being disposed in a displaceable manner at a first position engageably to stop said front curtain interlocking part and at a second position to enable the shutter front curtain to travel by release of said front curtain interlocking part;
• a rear curtain member displaceably provided at a first position engageably to stop said rear curtain interlocking part, and at a second position to enable the shutter rear curtain to travel by releasing said rear curtain interlocking part;
• and rear curtain control means engageably to stop said rear curtain member at said first position until lapse of a predetermined exposure time commencing at shutter release operation, the improvement which comprises:
• a. control means interlocked with the film winding operation to charge the shutter at the time of film winding by actuating said shutter moving means, and to displace each of said front and rear curtain members to said respective first positions, and including means for accumulating positional energy, said control means being operable to displace said front curtain member to the second position at the time of shutter release by discharging the positional energy accumulated during film winding;
• and
• b. shutter release means disposed engageably to retain said control means in a shutter charging condition.