Actuator and method of producing actuator
An actuator may include a supporting body; a movable body; a first magnetic drive circuit; a second magnetic drive circuit. The first magnetic drive circuit may include a first coil and a first magnet. The second magnetic drive circuit may include a second coil and a second magnet. The actuator may further include a first yoke on a side of the first coil remote from the second coil; a second yoke on a side of the second coil remote from the first coil; and a third yoke between the first coil and the second coil. The first magnet may be held on a face of the first yoke or a face of the third yoke. The second magnet may be held on a face of the second yoke or a face of the third yoke. The third yoke may be thicker than the first and second yoke.
1. An actuator comprising:
a supporting body;
a movable body structured to move relative to the supporting body;
a first magnetic drive circuit comprising:
a first coil; and
a first magnet adjacent to the first coil in a first direction;
wherein the first magnetic drive circuit is structured to drive the movable body in a second direction orthogonal to the first direction;
a second magnetic drive circuit comprising:
a second coil; and
a second magnet adjacent the second coil in the first direction;
wherein the second magnetic drive circuit is structured to drive the movable body in a third direction orthogonal to the first direction and intersecting the second direction, the second coil and the second magnet being aligned with the first magnetic drive circuit in the first direction;
a first yoke disposed on a side of the first coil remote from the second coil;
a second yoke disposed on a side of the second coil remote from the first coil; and
a third yoke disposed between the first coil and the second coil, wherein,
the first magnet is held on at least one of a face of the first yoke adjacent to the first coil and a face of the third yoke adjacent to the first coil,
the second magnet is held on at least one of a face of the second yoke adjacent to the second coil and a face of the third yoke adjacent to the second coil, and
the third yoke has a thickness larger than the first yoke and the second yoke in the first direction.
2. The actuator according to claim 1 , wherein,
the first magnet is disposed adjacent to a first effective side portion in the first direction, the first effective side portion being disposed on the first coil and extending in the third direction,
the second magnet is disposed adjacent to a second effective side portion in the first direction, the second effective side portion being disposed on the second coil and extending in the second direction,
the first yoke and the third yoke are coupled with two first couplers extending in the first direction across two sides of the first coil in the second direction, and
the second yoke and the third yoke are coupled with two second couplers extending in the first direction across two sides of the second coil in the third direction.
3. The actuator according to claim 2 , wherein,
the first couplers each comprises a sheetlike portion bent from a portion of the first yoke adjacent to the first coil in the first direction toward the third yoke, and
the second couplers each comprises a sheetlike portion from a portion of the second yoke adjacent to the second coil in the first direction bent toward the third yoke.
4. The actuator according to claim 3 , further comprising:
a first coil holder holding the first coil; and
a second coil holder holding the second coil, wherein,
the first coil holder comprises:
a first frame holding the first coil;
a first reinforcement frame disposed on a side of the first frame remote from the second coil holder; and
a plurality of first columns extending in the first direction and coupling the first frame and the first reinforcement frame,
the second coil holder comprises:
a second frame holding the second coil;
a second reinforcement frame disposed on a side of the second frame remote from the first coil holder; and
a plurality of second columns extending in the first direction and coupling the second frame and the second reinforcement frame,
a portion of the first yoke adjacent to the first coil is disposed between the first frame and the first reinforcement frame in the first direction, and
a portion of the second yoke adjacent to the second coil is disposed between the second frame and the second reinforcement frame in the first direction.
5. The actuator according to claim 4 , wherein,
the first magnet is held on a face of the first yoke adjacent to the first coil and a face of the third yoke adjacent to the first coil, and
the second magnet is held on a face of the second yoke adjacent to the second coil and a face of the third yoke adjacent to the second coil.
6. The actuator according to claim 5 , wherein,
the first coil and the second coil are disposed on the supporting body, and
the first magnet, the second magnet, the first yoke, the second yoke, and the third yoke are disposed on the movable body.
7. The actuator according to claim 6 , wherein,
a first elastic member having elasticity or viscoelasticity is disposed in contact with both the movable body and a first sheetlike part of the supporting body, the first elastic member being disposed between the movable body and the first sheetlike part of the supporting body adjacent to a side of the first coil on the movable body, the side of the first coil being remote from the second coil, and
a second elastic member having elasticity or viscoelasticity is disposed in contact with both the movable body and a second part of the supporting body, the second elastic member being disposed between the movable body and the second part of the supporting body adjacent to a side of the second coil on the movable body, the side of the second coil being remote from the first coil.
8. The actuator according to claim 7 , wherein,
the first elastic member is disposed between the first sheetlike part and the first yoke and in contact with both the first sheetlike part and the first yoke, and
the second elastic member is disposed between the second part and the second yoke and in contact with both the second part and the second yoke.
9. The actuator according to claim 1 , further comprising:
a first coil holder holding the first coil,
a second coil holder holding the second coil, wherein,
the first coil holder comprises:
a first frame holding the first coil;
a first reinforcement frame disposed on a side of the first frame remote from the second coil holder; and
a plurality of first columns extending in the first direction and coupling the first frame and the first reinforcement frame,
the second coil holder comprises:
a second frame holding the second coil;
a second reinforcement frame disposed on a side of the second frame remote from the first coil holder; and
a plurality of second columns extending in the first direction and coupling the second frame and the second reinforcement frame,
a portion of the first yoke adjacent to the first coil is disposed between the first frame and the first reinforcement frame in the first direction, and
a portion of the second yoke adjacent to the second coil is disposed between the second frame and the second reinforcement frame in the first direction.
10. The actuator according to claim 1 , wherein,
the first magnet is held on a face of the first yoke adjacent to the first coil and a face of the third yoke adjacent to the first coil, and
the second magnet is held on a face of the second yoke adjacent to the second coil and a face of the third yoke adjacent to the second coil.
11. The actuator according to claim 1 , wherein,
the first coil and the second coil are disposed on the supporting body, and
the first magnet, the second magnet, the first yoke, the second yoke, and the third yoke are disposed on the movable body.
12. The actuator according to claim 11 , wherein,
a first elastic member having elasticity or viscoelasticity is disposed in contact with both the movable body and a first sheetlike part of the supporting body, the first elastic member being disposed between the movable body and the first sheetlike part of the supporting body adjacent to a side of the first coil on the movable body, the side of the first coil being remote from the second coil, and
a second elastic member having elasticity or viscoelasticity is disposed in contact with both the movable body and a second part of the supporting body, the second elastic member being disposed between the movable body and the second part of the supporting body adjacent to a side of the second coil on the movable body, the side of the second coil being remote from the first coil.
13. The actuator according to claim 12 wherein,
the first elastic member is disposed between the first sheetlike part and the first yoke and in contact with both the first sheetlike part and the first yoke, and
the second elastic member is disposed between the second part and the second yoke and in contact with both the second part and the second yoke.