US 12,147,029 B2
Rotary reciprocating drive actuator
Yuki Takahashi, Tokyo (JP); Masaharu Kagami, Tokyo (JP); Yasutaka Kitamura, Tokyo (JP); and Yuki Otsuka, Tokyo (JP)
Assigned to Mitsumi Electric Co., Ltd., Tokyo (JP)
Filed by Yuki Takahashi, Tokyo (JP); Masaharu Kagami, Tokyo (JP); Yasutaka Kitamura, Tokyo (JP); and Yuki Otsuka, Tokyo (JP)
Filed on Feb. 17, 2022, as Appl. No. 17/673,816.
Claims priority of application No. 2021-025491 (JP), filed on Feb. 19, 2021; and application No. 2021-025500 (JP), filed on Feb. 19, 2021.
Prior Publication US 2022/0269068 A1, Aug. 25, 2022
Int. Cl. G02B 26/08 (2006.01); G02B 26/10 (2006.01); H02K 1/34 (2006.01); H02K 7/08 (2006.01); H02K 11/22 (2016.01)
CPC G02B 26/0816 (2013.01) [G02B 26/10 (2013.01); H02K 1/34 (2013.01); H02K 7/08 (2013.01); H02K 11/22 (2016.01)] 18 Claims
OG exemplary drawing
 
1. A rotary reciprocating drive actuator, comprising:
a movable part including a rotating shaft on which a movable object is disposed;
a fixed part configured to support the rotating shaft; and
a driving part configured to rotate the rotating shaft about an axis of the rotating shaft with respect to the fixed part by utilizing electromagnetic interaction, the driving part including a coil and a core each disposed on the fixed part, and a magnet disposed on the rotating shaft, wherein
the magnet is a ring-shaped magnet such that an S pole and an N pole are alternately disposed on an outer peripheral surface of the magnet in a circumferential direction of the magnet,
the core includes one or more magnetic pole parts that are excited to generate a polarity by energizing the coil, and the core is disposed in such a way that the one or more magnetic pole parts face the outer peripheral surface of the magnet via an air gap when the rotating shaft is attached to the fixed part, and
the number of one or more magnetic poles of the magnet is equal to the number of the one or more magnetic pole parts, and wherein
the rotary reciprocating drive actuator further includes a rotation angle position holding part configured to hold a rotation angle position of the rotation shaft at a neutral position by a magnetic attraction force generated between the magnet and the rotation angle position holding part, the rotation angle position holding part being disposed on the fixed part so as to face the magnet via the air gap, and wherein
the fixed part includes a first support and a second support disposed so as to face each other with the magnet therebetween in a direction of the axis,
the rotating shaft is rotatably attached to the first support via the first bearing and to the second support via the second bearing, and
one of the first bearing or the second bearing is a rolling bearing, and the other of the first bearing or the second bearing is a slide bearing.