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US 5,247,220 AGranted
Ultrasonic motor
AssigneeSeiko Epson Corporation
InventorsOsamu Miyazawa, Kiyoto Takedo
Life of this patent
Estimating the term…
Abstract
An ultrasonic step motor is provided with a stator and rotor. The rotor has a plurality of projections extending in the direction of the stator so that contact is made between the rotor and the stator creating a frictional force to drive the rotor. Vibrators are formed from a piezoelectric material directly attached to the stator. The ultrasonic motor further includes a drive control apparatus for impressing standing waves to the vibrating elements of the vibrator causing a change over to the phase or carrying out an ON-OFF operation of the ultrasonic motor.
Claims42
A motor comprising:
- a first member having portions selectively displaceable in a first direction;
- a second member movable in a second direction substantially orthogonal to said first direction;
- and drive control means for selectively displacing said first member portions so that said first member portions selectively contact said second member causing said second member to move in said second direction;
- each of said first and second members being formed with a surface facing the surface of the other member, said facing surfaces being shaped to cause the movement of the second member when selectively contacted by the surface of the first member;
- and
- at least one of said surfaces being an essentially flat sliding face so that the first member and the second member slide smoothly against one another, said sliding face having at least one leading edge in the direction of displacement of said sliding face, the leading edges of the sliding face having curved relief portions so that contact is made between the first and second members without interference.
3 more elements
A motor comprising:
- a first member having portions selectively displaceable in a first direction;
- a second member movable in a second direction substantially orthogonal to said first direction;
- and drive control means for selectively displacing said first member portions so that said first member portions selectively contact said second member causing said second member to move in said second direction;
- each of said first and second members being formed with a surface facing the surface of the other member, said facing surfaces being shaped to cause the movement of the second member when selectively contacted by the surface of the first member;
- at least one of said surfaces being an essentially flat sliding face so that the first member and the second member slide smoothly against one another, said sliding face having at least one leading edge in the direction of displacement of said sliding face;
- the leading edges of the sliding face being formed as slanted relief portions.
3 more elements
A motor comprising:
- a first member having portions selectively displaceable in a first direction;
- a second member movable in a second direction substantially orthogonal to said first direction;
- and drive control means for selectively displacing said first member portions so that said first member portions selectively contact said second member causing said second member to move in said second direction;
- each of said first and second members being formed with a surface facing the surface of the other member, said facing surfaces being shaped to cause the movement of the second member when selectively contacted by the surface of the first member;
- a plurality of first member projections formed on said first member and adapted to make contact with the surface of the second member;
- the first member projections include said displaceable portions being formed with ends, said ends being formed with rounded relief portions contacting with the surface of the second member.
3 more elements
A motor comprising:
- a first member having portions selectively displaceable in a first direction;
- a second member movable in a second direction substantially orthogonal to said first direction;
- and drive control means for selectively displacing said first member portions so that said first member portions selectively contact said second member causing said second member to move in said second direction;
- each of said first and second members being formed with a surface facing the surface of the other member, said facing surfaces being shaped to cause the movement of the second member when selectively contacted by the surface of the first member;
- a plurality of first member projections formed on said first member and adapted to make contact with the surface of the second member;
- the plurality of first member projections being formed on the circumference of the first member extending in a radial direction from the center of the first member;
- the plurality of first member projections being formed so that the projections are thinned in the radial direction, thereby decreasing the rigidity of the first member and increasing the oscillation amplitude.
4 more elements
A motor comprising:
- a first member having portions selectively displaceable in a first direction;
- a second member movable in a second direction substantially orthogonal to said first direction;
- and drive control means for selectively displacing said first member portions so that said first member portions selectively contact said second member causing said second member to move in said second direction;
- a first member having portions selectively displaceable in a first direction;
- a second member movable in a second direction substantially orthogonal to said first direction;
- and drive control means for selectively displacing said first member portions so that said first member portions selectively contact said second member causing said second member to move in said second direction;
- said first member including a stator having said displaceable portions;
- said second member including a rotor, said rotor having a plurality of radial projections, said projections being selectively contacted by said stator;
- a plurality of vibrator means, at least one of said vibrator means being operably coupled to one of said displaceable stator portions for displacing said stator portions;
- and
- said drive control means exciting each of said plurality of vibrator means to form a standing wave in said displaceable portions of said stator, and phase shifting said standing wave to move said rotor in a stepwise manner.
8 more elements
A motor comprising:
- a first member having portions selectively displaceable in a first direction;
- a second member movable in a second direction substantially orthogonal to said first direction;
- and drive control means for selectively displacing said first member portions so that said first member portions selectively contact said second member causing said second member to move in said second direction;
- wherein said first member includes a stator having said displaceable portions;
- said second member including a rotor, said rotor having a plurality of radial projections, said projections being selectively contacted by said stator;
- a plurality of vibrator means, at least one of said vibrator means being operably coupled to one of said displaceable stator portions for displacing said stator portions;
- and
- second drive control means exciting said vibrator means so as to form an advancing wave in said stator to continuously drive the rotor.
5 more elements
A motor comprising:
- a first member having portions selectively displaceable in a first direction;
- a second member movable in a second direction substantially orthogonal to said first direction;
- and drive control means for selectively displacing said first member portions so that said first member portions selectively contact said second member causing said second member to move in said second direction;
- each of said first and second members being formed with a surface facing the surface of the other member, said facing surfaces being shaped to cause the movement of the second member when selectively contacted by the surface of the first member;
- and
- a plurality of first member projections which include said displaceable portions being formed on said first member and adapted to make contact with the surface of the second member;
- wherein the plurality of displaceable portions are disposed at positions about said first member different from and opposed to locations which become vibration nodes of the first member.
4 more elements
A motor comprising:
- a first member having portions selectively displaceable in a first direction;
- a second member formed with a periphery and openings therethrough at locations therein spaced from the periphery, said second member being movable at least at said periphery in a second direction substantially orthogonal to said first direction;
- and drive control means for selectively displacing said first member portions so that said first member portions selectively contact said second member causing said second member to move in said second direction;
- and
- each of said first and second members being formed with a surface facing the surface of the other member, said facing surfaces being shaped to cause the movement of the second member when selectively contacted by the surface of the first member.
2 more elements
A motor comprising;
- a first member having portions selectively displaceable in a first direction;
- a second member having spring portions movable in a second direction substantially orthogonal to said first direction;
- and drive control means for selectively displacing said first member portions so that said first member portions selectively contact said second member causing said second member to move in said second direction;
- and
- each of said first and second members being formed with a surface facing the surface of the other member, said facing surfaces being shaped to cause the movement of the second member when selectively contacted by the surface of the first member.
2 more elements
A motor comprising:
- a first member having portions selectively displaceable in a first direction;
- a second member movable in a second direction substantially orthogonal to said first direction;
- and drive control means for selectively displacing said first member portions so that said first member portions selectively contact said second member causing said second member to move in said second direction;
- a base plate;
- said second member being disposed between the first member and said base plate;
- a piezoelectric element coupled to the second member;
- a plurality of electrode patterns formed on the piezoelectric element;
- at least one wiring pattern formed on said base plate in a facing relationship with said plurality of electrode patterns formed on the piezoelectric element;
- and
- an anisotropic conductor including a carbon wire and a metal wire fixed to one another by an insulator in a conductive direction connecting the plurality of the electrode patterns to at least one wiring pattern.
7 more elements
Dependencies are inferred from the claim text.