Driving apparatus
An anti-vibration unit serving as a driving apparatus has an X axis transducer having a driver, a fixed frame having an X axis transducer holding part, an X frame having a sliding body against which the driver is pressed by a pressing plate with an anti-vibration sheet and a holder interposed therebetween, a Y axis transducer having a driver, and a Y frame having a sliding body against which the driver is pressed by the pressing plate with the anti-vibration sheet and the holder interposed therebetween. The anti-vibration sheet is narrower than the transducer, and grease is applied to one of the surfaces of the anti-vibration sheet and the pressing plate in contact with each other, so that the drivers are in proper contact with the sliding bodies, and the sliding bodies are efficiently driven. The driving apparatus is compact and produces high driving force with high efficiency.
1. A driving apparatus, comprising:
an actuator having a driver disposed on one surface of a piezoelectric device having a shape of a rectangular parallelepiped;
a holding member that holds the actuator;
a movable member that is moved on the holding member by the driver;
a restricting member that restricts a position of the piezoelectric device with respect to the holding member;
an anti-vibration sheet fixed to the restricting member; and
a pressing member that presses the driver disposed on the actuator against the movable member with the restricting member and the anti-vibration sheet interposed therebetween,
wherein the restricting member has a protrusion that serves as a point of application of a pressing force of the pressing member at a center part in a longitudinal direction of the piezoelectric device having the shape of a rectangular parallelepiped, the anti-vibration sheet is fixed to the restricting member to cover the protrusion, and a low friction material is interposed between the anti-vibration sheet and the pressing member in a vicinity of the protrusion.
2. The driving apparatus according to claim 1 , wherein the low friction material is grease, or a fluorine resin coating applied to the anti-vibration sheet or the pressing member.
3. The driving apparatus according to claim 1 , wherein a width of the anti-vibration sheet in a direction perpendicular to a longitudinal direction of the surface on which the driver is disposed is smaller than a width of the driver in the direction perpendicular to the longitudinal direction.
4. A driving apparatus, comprising:
a transducer that produces an elliptic vibration on a driver in response to application of a periodic voltage at a predetermined frequency;
a fixed member that has a holding part for holding the transducer; and
a movable body that is driven and moved by the elliptic vibration of the transducer in a predetermined direction determined by a guiding part of the fixed member, the driver being pressed by a pressing member held by the fixed member pressing a pressing part of the transducer,
wherein a vibration damping sheet is fixed to the pressing part, and a low friction material is interposed between the vibration damping sheet and the pressing part.
5. The driving apparatus according to claim 4 , wherein the vibration damping sheet is fixed to the pressing part by an adhesive.