Vibration-proof lens unit and image capturing apparatus

A vibration-proof lens unit comprising:

• a lens holder that holds a vibration-proof lens;
• a support that supports the lens holder in a manner to be movable within a plane orthogonal to an optical axis of the vibration-proof lens;
• an engaging section that engages the lens holder with the support such that the lens holder can move (i) in a rotational direction around an axis line parallel to the optical axis of the vibration-proof lens and (ii) in a direction of a rotational radius orthogonal to the axis line;
• a rotational driving unit that moves the lens holder in the rotational direction;
• a linear driving unit that moves the lens holder in the direction of the rotational radius, and
• first, second, and third support points that are arranged to surround the optical axis of the vibration-proof lens and a center of mass of a movable part that includes the lens holder and moves integrally with the lens holder, and that support the lens holder on the support, wherein
• the rotational driving unit and the linear driving unit are voice coil motors that each include (i) a magnet provided on one of the lens holder and the support and (ii) a coil and a yoke provided on the other of the lens holder and the support to face the magnet,
• the rotational driving unit and the linear driving unit are provided on opposite sides of a first line connecting the first support point and the second support point, and are provided on opposite sides of a second line that connects the second support point and the third support point,
• the rotational driving unit is provided on the opposite side of the first line from the center of mass and the optical axis of the vibration-proof lens,
• the linear driving unit is provided on the opposite side of the second line from the center of mass and the optical axis of the vibration-proof lens,
• (i) a distance A1 between the first line and a center of the magnet provided to the rotational driving unit, (ii) magnetic attraction B of the magnet of the rotational driving unit, (iii) a distance C1 between the center of mass and the first line, (iv) weight D of the movable part, (v) a distance E1 between the first line and a center of the magnet provided to the linear driving unit, and (vi) magnetic attraction F of the magnet of the linear driving unit satisfy Expression 2,
• Expression 2 is defined as:
• A1×B<C1×D+E1×F,
• (vii) a distance A2 between the second line and the center of the magnet provided to the linear driving unit, (viii) the magnetic attraction F of the magnet of the linear driving unit, (ix) a distance C2 between the center of mass and the second line, (x) the weight D of the movable part, (xi) a distance E2 between the second line and the center of the magnet provided to the rotational driving unit, and (xii) the magnetic attraction B of the magnet of the rotational driving unit satisfy Expression 3, and
• Expression 3 is defined as:A2×F<C2×D+E2×B.