Patent ID: 7708477

Claim:
A focal plane shutter for cameras comprising, a shutter base plate having an exposure aperture; at least one shutter blade which consists of two or more arms, and at least one blade pivoted by the arms wherein an end of the arms is individually attached rotatably to two or more blade attachment shanks which are installed upright to the shutter base plate; and at least one drive component which is rotatably attached to the drive component attachment shank installed upright on the shutter base plate, and carries out opening and closing operations of the exposure aperture by the shutter blade by swinging one of the arms; wherein at least one attachment shank of two or more attachment shanks which are installed upright in order to install a rotation component including the drive component attachment shank is made of synthetic resin; and a long groove for sump is formed along the axial direction of the shank at a position where it is fitted into the rotation component at the circumferential side surface.