Patent ID: 6899473
Filing Date: 2005-05-31
Classification: G03B

Abstract:
1. A focal plane shutter for cameras comprising: a shutter base plate having a first opening for a photographing path, an auxiliary base member which has a second opening to regulate an opening for the photographing optical path by at least one of the first opening and the shutter base plate, and constitutes a blade chamber between the shutter base plate and the auxiliary base member, a shutter blade which is constituted by a plurality of arms arranged in the blade chamber and pivoted on the shutter base plate, and at least one blade pivoted respectively on each arm, an actuating member which is rotatably arranged on the shutter plate and is connected with the shutter blade, and actuates the shutter blade by its reciprocating rotation between a fully opened position and a completely closed position of the opening for the photographing optical path, an electromagnetic actuating device which is arranged on the shutter base plate and carries out the reciprocating rotation of the actuating member, a brake member which is rotatably arranged on the shutter base plate and has two pressed portions which are contacted, pressed and moved by the actuating member at each termination stage of the reciprocating rotation of the actuating member, and a brake means which brakes rotation of the brake member by friction power generated by contacting under pressure with the brake member.