Image stabilization apparatus, lens apparatus and camera system having the same

A lens apparatus comprising:

• a focus lens;
• and
• an image stabilization apparatus,
• wherein the image stabilization apparatus includes:
• a fixed member;
• a lens;
• a movable member configured to hold the lens and movable relative to the fixed member on a plane perpendicular to an optical axis of the lens;
• a guide member movable relative to the fixed member on the plane perpendicular to the optical axis and configured to guide the movable member while suppressing the movable member from rotating relative to the fixed member on the plane perpendicular to the optical axis;
• a first rolling member held and configured to roll between the fixed member and the guide member;
• a second rolling member held and configured to roll between the guide member and the movable member;
• and
• a third rolling member held and configured to roll between the fixed member and the movable member,
• wherein at least one of the fixed member, the movable member, and the guide member includes a movement restrictor configured to restrict a moving range of a restricted rolling member as at least one of the first to third rolling members in a predetermined direction on the plane perpendicular to the optical axis, and
• wherein the movement restrictor is formed such that as the restricted rolling member approaches to an end portion of the moving range, a center of the restricted rolling member approaches to a centerline in a width direction perpendicular to the predetermined direction of the movement restrictor.

A camera system comprising:

• a lens apparatus;
• and
• an image sensor configured to photoelectrically convert an object image formed via the lens apparatus,
• wherein the lens apparatus includes a focus lens and an image stabilization apparatus,
• wherein the image stabilization apparatus includes:
• a fixed member;
• a lens;
• a movable member configured to hold the lens and movable relative to the fixed member on a plane perpendicular to an optical axis of the lens;
• a guide member movable relative to the fixed member on the plane perpendicular to the optical axis and configured to guide the movable member while suppressing the movable member from rotating relative to the fixed member on the plane perpendicular to the optical axis;
• a first rolling member held and configured to roll between the fixed member and the guide member;
• a second rolling member held and configured to roll between the guide member and the movable member;
• and
• a third rolling member held and configured to roll between the fixed member and the movable member,
• wherein at least one of the fixed member, the movable member, and the guide member includes a movement restrictor configured to restrict a moving range of a restricted rolling member as at least one of the first to third rolling members in a predetermined direction on the plane perpendicular to the optical axis, and
• wherein the movement restrictor is formed such that as the restricted rolling member approaches to an end portion of the moving range, a center of the restricted rolling member approaches to a centerline in a width direction perpendicular to the predetermined direction of the movement restrictor.