Electromagnetically driven shutter device for camera

An electromagnetically driven shutter for a camera, comprising:

• (a) a permanent magnet member composed of a ferromagnetic substance having a large coercive force;
• (b) a conductive member arranged to be under the influence of the magnetic field formed with the permanent magnet member, one of the conductive member and the permanent magnetic member being secured on the camera body and the other being movable;
• (c) a shutter blade arrangement including a plurality of light shading thin plates for blocking the photographing light path of a camera, and including a part connected to the plates and operatively connected to the movable one of the permanent magnetic member and the conductive member;
• (d) source means coupleable to a power source to supply current to the conductive member;
• (e) first switching means in series with said source means for forming a current supply circuit from the power source to the conductive member and to close the current supply circuit in response to a shutter release signal;
• (f) a capacitor;
• and
• (g) circuit means for connecting said capacitor to said source means along a path outside said conductive member so as to charge said capacitor prior to a release signal, and for connecting said capacitor to add the voltage of the capacitor to the voltage at the source means and apply it through the conductive member in response to a release signal so as to increase the initial speed of the shutter blade arrangement.