Patent ID: 6382848
Filing Date: 2002-05-07
Classification: G03B

Abstract:
A shutter for a camera, comprising:a supporting plate having an opening therethrough; a fixed printed board fixed to the supporting plate and having a plurality of fixed coil patterns disposed substantially in a concentric shape relative to a center of an optical axis of the opening; a shutter base plate confronting the supporting plate; a movable printed board pivotably supported by the shutter base plate to confront the fixed printed board, the movable printed board having a plurality of coil patterns disposed thereon which, in an initial position of the movable printed board, are deviated from the respective coil patterns formed on the fixed printed board by a predetermined angle; a biasing member for biasing the movable printed board so that the coil patterns disposed thereon are deviated at the initial position by the predetermined angle; a drive circuit for selectively conducting electricity to the coil patterns on the fixed printed board and the movable printed board to generate an attractive or repulsive magnetic field therebetween to cause the movable printed board to undergo pivotal movement with respect to the fixed printed board; a cam mechanism provided on the movable printed board and the shutter base plate to produce a pivotal force applied to the movable printed board in response to a force applied to the movable printed board in a direction of the optical axis; and a sector member engaged to undergo pivotal movement with the movable printed board so as to open and close the opening in response to pivoting of the movable printed board.