| CPC G02B 7/1821 (2013.01) [G02B 26/101 (2013.01); G02B 26/105 (2013.01); F16C 41/007 (2013.01)] | 20 Claims |
|
1. An actuator comprising:
a swing portion that is electrically conductive;
a frame portion to support the swing portion such that the swing portion is swingable about a first axis orthogonal to a central axis extending vertically;
a support portion to support the frame portion such that the frame portion is swingable about a second axis orthogonal to the first axis and intersecting the central axis;
a magnet below the swing portion;
a drive assembly including a drive coil defined by a lead wire wound around a stator core in the support portion and extending in the central axis direction;
a non-magnetic structure between the swing portion and the drive coil in the central axis direction; and
an angle detector to detect a swing angle of the swing portion; wherein
the angle detector includes a pair of first angle detection elements extending in the second axis direction with the first axis interposed therebetween and a pair of second angle detection elements extending in the first axis direction with the second axis interposed therebetween when viewed from the central axis direction, and the angle detector is above the non-magnetic structure; and
each of the first angle detection elements and each of the second angle detection elements include:
a columnar magnetic structure between the swing portion and the non-magnetic structure in the central axis direction; and
a detection coil extending along an outer periphery of the magnetic structure; and
the drive coil is inside an outer edge of the non-magnetic structure when viewed from the central axis direction.
|