JP2014182167A5 - - Google Patents

Claims (7)

A reflection mirror, a rotor mounted with the reflection mirror, a shaft attached to the rotor, a stator arranged with a predetermined gap from the rotor, and holding the stator, and A galvano scanner having a shaft inserted therein and a base mounted with a bearing for rotatably holding the rotor,
The rotor is formed of a permanent magnet of a partial cylindrical body,
The permanent magnet forms a groove extending in the axial direction at the center position in the circumferential direction of the circular arc surface of the peripheral wall, the surface on the opposite side of the groove is used as a reflection mirror mounting surface, and the surfaces on both ends are shaft mounting surfaces And the central axis of the peripheral wall arc surface in the permanent magnet portion coincides with the rotation center axis of the rotor,
The stator is formed of a core of a partial cylindrical body and a coil disposed on an inner arc surface of the core,
The core has a radius of curvature of the inner arc surface larger than a radius of curvature of the peripheral wall arc surface of the permanent magnet, and the central axis of the inner arc surface coincides with the rotation center axis;
The coil has a racetrack shape that includes one linear portion and the other linear portion that extend in the axial direction, and an arc portion that connects both ends of the one linear portion and the other linear portion. A galvano scanner which is formed in a circular arc shape in the circumferential direction and faces the circular arc surface of the permanent magnet with the gap. The permanent magnet is formed of a first permanent magnet and a second permanent magnet divided by a plane connecting the rotation center axis and the midpoint of the bottom of the groove;
The magnetization direction of the first permanent magnet is the direction of the midpoint of the circumferential direction in one linear portion of the coil from the rotation center axis, and the magnetization direction of the second permanent magnet is the other direction of the coil. The galvano scanner according to claim 1, wherein the galvano scanner is in the direction from the midpoint in the circumferential direction of the straight line portion to the rotation center axis. The permanent magnet is an integral part that is not divided by a plane connecting the rotation center axis and the midpoint of the bottom of the groove, and the magnetization direction of the permanent magnet is the rotation direction of the rotor, and The galvano scanner according to claim 1, wherein the galvano scanner is parallel to a surface of the reflection mirror. The permanent magnet is an integral part that is not divided by a plane connecting the rotation center axis and the midpoint of the bottom of the groove, and the magnetization direction of the permanent magnet is the rotation direction of the rotor, and The galvano scanner according to claim 1, wherein the galvano scanner has an arc shape that is convex toward the reflecting mirror. A coil center hole that is an angle formed by a line segment connecting the rotation center axis and the inner end of each linear portion of the coil with a rotation angle γ that rotates the rotor from a position that keeps the reflection mirror horizontal. The angle β is smaller than (β + α) / 2, which is half of a value obtained by adding a groove opening angle α, which is an angle formed by a line segment connecting the rotation center axis and the opening of the groove. The galvano scanner according to any one of claims 1 to 4. The permanent magnet, forms an axial hole in the rotation center shaft, according to any one of claims 1 to 5, characterized in that it is installed a bolt through the hole Galvo scanner. The galvano scanner according to any one of claims 1 to 6, wherein the permanent magnet is divided into a plurality of planes parallel to the shaft mounting surface.