Actuator with first connecting body disposed in first direction and second connecting body disposed in second direction
The actuator includes a movable body, a support body with a case that accommodates the movable body and a coil holder, a connecting body connected to the movable body and the support body, and a magnetic drive circuit including a coil and magnets opposed to the coil in a Z direction and causing the movable body to vibrate in an X direction with respect to the support body. The connecting body 4 includes the first connecting body 6 disposed at the position where the movable body 5 and the support body 3 are opposed to each other in the Z direction (first direction), and the second connecting body 9 disposed at the position where the movable body 5 and the support body 3 are opposed to each other in the X direction (second direction). The first connecting body and the second connecting body are viscoelastic bodies.
1. An actuator, comprising:
a support body;
a movable body;
a connecting body that is connected to the movable body and the support body; and
a magnetic drive circuit including a coil and a magnet opposed to the coil in a first direction and to cause the movable body to vibrate in a second direction that intersects the first direction with respect to the support body, wherein
the connecting body includes:
a first connecting body disposed at a position where the movable body and the support body are opposed in the first direction or a position where the movable body and the support body are opposed in a third direction that intersects the first direction and intersects the second direction; and
a second connecting body disposed at a position where the movable body and the support body are opposed in the second direction, wherein
the support body includes a case to accommodate the movable body and the magnetic drive circuit, and a coil holder to hold the coil, the coil holder including a plate portion in which a coil placement hole is provided;
the movable body includes a yoke to hold the magnet;
the yoke includes a first flat plate portion opposed to the plate portion from one side of the first direction, a second flat plate portion opposed to the plate portion from the other side of the first direction, and a pair of connecting plate portions disposed on both sides in the second direction of the plate portion;
the case includes a pair of side plate portions disposed on both sides in the second direction of the yoke; and
the second connecting body is disposed between one of the pair of connecting plate portions and one of the pair of side plate portions, and between the other of the pair of connecting plate portions and the other of the side plate portions.
2. The actuator according to claim 1 , wherein
a drive waveform when the magnetic drive circuit is driven has a square wave.
3. The actuator according to claim 1 , wherein
the support body includes a first plate that covers the plate portion and the coil from one side of the first direction, and a second plate that covers the plate portion and the coil from the other side of the first direction;
the magnet includes a first magnet that is fixed to the first flat plate portion and is opposed to the coil from one side of the first direction through the first plate, and a second magnet that is fixed to the second flat plate portion and is opposed to the coil from the other side of the first direction through the second plate; and
the first connecting body includes a one-side connecting body to connect the first flat plate portion and the first plate, and an other-side connecting body to connect the second flat plate portion and the second plate.
4. The actuator according to claim 1 , wherein
the first connecting body and the second connecting body are viscoelastic bodies.
5. The actuator according to claim 4 , wherein
a spring constant when the first connecting body is deformed in a compression direction is different from a spring constant when the second connecting body is deformed in a compression direction.
6. The actuator according to claim 5 , wherein
the spring constant when the second connecting body is deformed in the compression direction is larger than the spring constant when the first connecting body is deformed in the compression direction.