Patent ID: 7980772

Claim:
An image pickup apparatus comprising: an image sensor; and a shutter device disposed on the subject side of said image sensor, wherein said shutter device includes a trailing curtain operative to run from an exposure start position to an exposure end position to cover an exposure aperture, a first driving member operative to cause said trailing curtain to run from said exposure start position to said exposure end position, a second driving member operative to cause said trailing curtain to run from said exposure end position to said exposure start position, first urging force applying means by which a first urging force for moving said trailing curtain in a first direction from said exposure start position toward said exposure end position is applied to said first driving member, and a charging member which moves said first driving member in a predetermined direction so as to overcharge said first urging force applying means and thereby to increase said first urging force, said charging member moves said first driving member in said predetermined direction while restraining movement of said second driving member, so as to overcharge said first urging force applying means while maintaining a closed state of said aperture formed by said trailing curtain and thereby to transfer said shutter device into a first set condition, and, in said first set condition, makes contact with said first driving member to restrain movement of said first driving member, and said charging member in said closed state of said aperture formed by said trailing curtain, releases the restraint on movement of said second driving member to permit said second driving member to move, while moving said first driving member in said predetermined direction, so as to form an open state of said aperture by said trailing curtain while overcharging said first urging force applying means and thereby to transfer said shutter device into a second set condition, and, in said second set condition, makes contact with said first driving member to restrain movement of said first driving member.