Rotary reciprocating drive actuator

A rotary reciprocating drive actuator, comprising:

• a movable body including a shaft part to which a magnet is fixed at an outer circumference thereof, the movable body being capable of performing a reciprocating rotation about an axis;
• a base portion including a pair of wall portions for supporting the shaft part via a bearing such that the shaft part is rotatable;
• a core assembly including:
• a core body having a plurality of magnetic poles facing an outer circumference of the magnet to sandwich the magnet,
• a coil body that is wound around the core body and that is energized to generate a magnetic flux interacting with the magnet to cause a reciprocating rotation of the movable body, and
• a magnet position holding portion that generates a magnetic attraction force between the magnet position holding portion and the magnet to define a reference position of the reciprocating rotation;
• and
• a preload applying part that is externally fitted to the shaft part, and is configured to apply a preload to the bearing,
• wherein an annular receiving portion is fixed to the shaft part at a position between the bearing through which the shaft part is inserted and the magnet, the annular receiving portion being adjacent to the magnet;
• and
• wherein the preload applying part is arranged between the annular receiving portion and the bearing, and is configured to press the annular receiving portion and the bearing along the shaft part.