Patent ID: 8023812
Filing Date: 2011-09-20
Classification: G02B

Abstract:
1. A position controller for an optical element that is provided in an optical system, comprising: a movable member which holds said optical element, and is supported by a support member to be linearly movable from an anti-shake driving range in which said optical element is positioned on an optical axis of said optical system to a removed position outside of said anti-shake driving range; an electromagnetic actuator which includes a first coil and a second coil that are supported by said support member and a first magnet and a second magnet that are supported by said movable member, wherein said electromagnetic actuator drives said movable member within said anti-shake driving range by controlling a passage of current through said coil in accordance with a magnitude and a direction of vibrations applied to said optical system; and an insertion/removal operational member which moves between an insertion position to position said movable member at said anti-shake driving range and a removed holding position to position said movable member at said remove position by a drive source different from said electromagnetic actuator, wherein, when said movable member is positioned in said anti-shake driving range, said first magnet and said first coil face each other in said optical axis direction while said second magnet and said second coil face each other in said optical axis direction, wherein, when said movable member is positioned in said removed position, said first magnet and second magnet do not face said first coil and said second coil in said optical axis direction, respectively, and wherein said first magnet and said second magnet are arranged on opposite sides of a removing direction center line which passes through an approximate center of said optical element and extends in a moving direction of said movable member so that a distance between a magnetic pole boundary line of said first magnet and a magnetic pole boundary line of said second magnet increases toward said anti-shake driving position from said removed position.