Image sensing system

An image sensing system comprising:

• image sensing means for sensing the image of an object to be photographed;
• two shutter blades which block image light coming toward said image sensing means;
• two rotative driving means for driving said two shutter blades respectively;
• control means for controlling the difference in rotating phase between said two rotative driving means to keep the difference unvarying;
• wherein said control means includes detecting means for detecting the rotating phases of said two rotative driving means;
• wherein said detecting means is arranged to detect a time at which the first shutter blade completes a light blocking action and to detect a time at which the second shutter blade commences a light blocking action;
• wherein said control means includes a first signal generating means for producing a first signal which varies with the lapse of time after completion of the light blocking action and a second signal generating means for producing a second signal which varies with the lapse of time after the commencement of the light blocking action;
• and
• wherein each of said first and second signal generating means includes a constant current circuit and a capacitor which stores electric charge of a current flowing from said constant current circuit.