Image blur correction apparatus
In an image blur correction apparatus, rotation of a correction lens about an optical axis is regulated without special mechanism or drive unit. When displacing a third lens unit in a pitch and yaw directions, forces Bp, By driving a shift base are generated in the respective directions by Lorentz force, to generate forces Cp, Cy, Dp, Dy returning a magnet to an original position by attraction force. By, Cy and Bp, Dp, respectively, are exerted on the same axes, whereas Cp, Dy are not in the same axes as those of Bp, By, respectively, so that a rotational moment for the shift base is generated and the shift base is stabilized at a first angle. Since the first angle is smaller than a second angle regulated by a restriction portion for a shift movement frame, the shift base does not abut the shift movement frame to deteriorate image stabilization.
1. An image blur correction apparatus, comprising:
a movable member retaining one of an image stabilization optical element movable in a direction orthogonal to an optical axis and an image pickup element movable in the direction orthogonal to the optical axis;
a ball positioning the movable member in an optical axis direction;
a fixed member positioning the ball in the optical axis direction;
a drive unit provided with a magnet for driving provided on one of the movable member and the fixed member, and with a coil and a magnetic member provided on the other of the movable member and the fixed member, and
a restriction portion provided on the fixed member,
wherein the movable member is retained at a center by an attraction force of the magnet for driving, and regulates, at a time of its movement, rotation in a plane orthogonal to the optical axis by the attraction force of the magnet for driving to a rotation angle equal to or smaller than a first rotation angle,
wherein the restriction member is abutted to the movable member so that the rotation of the movable member in the plane orthogonal to the optical axis is regulated by a second rotation angle, and
wherein the first rotation angle is smaller than the second rotation angle.
2. An image blur correction apparatus according to claim 1 , wherein the rotating direction restriction portion is configured to have a leeway amount with respect to the movable member in a first direction of the first rotation angle due to the attraction force of the magnet for driving and a leeway amount with respect to the movable member in a second direction opposite to the first direction which is smaller than the leeway amount in the first direction.
3. A lens barrel, comprising the image blur correction apparatus according to claim 1 .