Image stabilization apparatus, lens apparatus having image stabilization apparatus, and image pickup apparatus having image stabilization apparatus

A lens apparatus comprising an image stabilization apparatus that moves an image stabilizing lens in a plane perpendicular to an optical axis, the image stabilization apparatus comprising:

• a fixed lens barrel;
• a lens moving frame holding the image stabilizing lens and movable relative to the fixed lens barrel in a plane perpendicular to the optical axis of the image stabilizing lens;
• an actuator that drives the lens moving frame relative to the fixed lens barrel in said plane;
• and
• two or more encoders used to determine the position of the lens moving frame relative to the fixed lens barrel in said plane,
• wherein each of the encoders includes a scale fixed to either the lens moving frame or the fixed lens barrel and a detector fixed to the other, the scale is arranged in such a way that the direction of arrangement of its grating is oriented in a radial direction about the optical axis so that the encoder has a sensitivity to a displacement of the lens moving frame in the radial direction about the optical axis which is higher than a sensitivity to a displacement of the lens moving frame in a rotation direction about the optical axis.

An image pickup apparatus comprising a lens apparatus including an image stabilization apparatus that moves an image stabilizing lens in a plane perpendicular to an optical axis and an image pickup element that receives an optical image formed by the lens apparatus, the image stabilization apparatus comprising:

• a fixed lens barrel;
• a lens moving frame holding the image stabilizing lens and movable relative to the fixed lens barrel in a plane perpendicular to the optical axis of the image stabilizing lens;
• an actuator that drives the lens moving frame relative to the fixed lens barrel in said plane;
• and
• two or more encoders used to determine the position of the lens moving frame relative to the fixed lens barrel in said plane,
• wherein each of the encoders includes a scale fixed to either the lens moving frame or the fixed lens barrel and a detector fixed to the other, the scale is arranged in such a way that the direction of arrangement of its grating is oriented in a radial direction about the optical axis so that the encoder has a sensitivity to a displacement of the lens moving frame in the radial direction about the optical axis which is higher than a sensitivity to a displacement of the lens moving frame in a rotation direction about the optical axis.