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US 5,672,930 AGranted
Vibration motor
AssigneeNikon Corporation
InventorsTsutomu Narisawa, Michihiro Tobe, Takatoshi Ashizawa
Life of this patent
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Abstract
A vibration linear motor utilizing a composite vibration of a bending vibration and a longitudinal vibration, provided with a plate-shaped elastic member having a plate-shaped main body portion and a pair of driving force output portions provided on the surface of the main body portion for driving a driven object; and an electromechanical converting element adhered to the elastic member and adapted to generate the composite vibration, wherein the electromechanical converting element is provided on the surface, between the paired driving force output portions, of the main body portion.
Claims14
A vibration motor comprising:
- an elastic member having a pair of driving output portions extending perpendicularly from a first face thereof;
- a first electromechanical converting element adhered on the first face of said elastic member and between said pair of driving output portions, to harmonically generate a longitudinal vibration mode and a bending vibration mode in said elastic member;
- and
- a second electromechanical converting element adhered on a second face of said elastic member, other than the first face on which said first electromechanical converting element is adhered to said elastic member;
- wherein the directions of polarization of said first and second electromechanical converting elements are substantially orthogonal to the direction of driving of said vibration motor;
- and
- said first and second electromechanical converting elements are substantially equidistant from a plane perpendicular to the direction of driving of said vibration motor.
4 more elements
A vibration actuator comprising:
- a driving force circuit which generates a main drive signal and a sub drive signal;
- a main electromechanical converting element to be driven by said main drive signal;
- a sub electromechanical converting element to be driven by said sub drive signal;
- an elastic member having a first face, a second face and a driving force output portion, wherein said main electromechanical converting element is adhered to said first face, said driving force output portion extends perpendicularly from said first face and said sub electromechanical converting element is adhered to said second face;
- and
- a drive signal switching circuit which controls supply of said main drive signal to said main electromechanical converting element and controls selective supply of said sub drive signal to said sub electromechanical converting element;
- wherein
- said main electromechanical converting element generates, in said driving force output portion of said elastic member, an elliptical movement including a component in the driving direction and a component in a direction perpendicular to the driving direction;
- said sub electromechanical converting element generates, in said driving force output portion of said elastic member, a movement only of a component in the driving direction;
- and
- the direction of polarization of said main electromechanical converting element is substantially orthogonal to the direction of driving of said vibration actuator and the direction of polarization of said sub electromechanical converting element is substantially orthogonal to said second face.
8 more elements
A vibration actuator comprising:
- a driving force circuit which generates a main drive signal and a sub drive signal;
- a main electromechanical converting element to be driven by said main drive signal;
- first and second sub electromechanical converting elements to be driven by said sub drive signal;
- an elastic member having a first face, a second face, a third face and a driving force output portion, wherein said driving force output portion extends perpendicularly from said first face and said main electromechanical converting element is adhered to said first face and said first and second sub electromechanical converting elements are adhered to said second and third faces, respectively;
- and
- a drive signal switching circuit which controls supply of said main drive signal to said main electromechanical converting element and controls selective supply of said sub drive signal to said first and second sub electromechanical converting elements;
- wherein
- said main electromechanical converting element generates, in said driving force output portion of said elastic member, an elliptical movement including a component in the driving direction and a component in a direction perpendicular to the driving direction;
- said first and second sub electromechanical converting elements generate, in said driving force output portion of said elastic member, movement only of a component in the driving direction;
- and
- the direction of polarization of said main electromechanical converting element is substantially orthogonal to the direction of driving of said vibration actuator and the directions of polarization of said first and second sub electromechanical elements are substantially orthofional to said second and third faces, respectively.
8 more elements
Dependencies are inferred from the claim text.