US 5,345,137 AGranted

Two-dimensionally driving ultrasonic motor

AssigneeOlympus Optical Co., Ltd.

InventorsTomoki Funakubo, Katsuhiro Wakabayashi

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Abstract

This two-dimensional driving ultrasonic motor comprises a first electro-mechanical energy converting device consisting of an ultrasonic vibrator having a unidirectional polarizing process applied to the entire surface; a second electro-mechanical energy converting device consisting of an ultrasonic vibrator laminated on this first electro-mechanical energy converting device and having a reversely directed polarizing process applied with a central line segment serving as a boundary between the oppositely polarized areas; a third electro-mechanical energy converting device consisting of an ultrasonic vibrator laminated on the first and second electro-mechanical energy converting devices and having a reversely directed polarizing process applied with a line segment serving as a boundary between the oppositely polarized areas, the second and third devices being aligned so that the line segments intersect at right angles; a friction member fixed to the lamination end of the laminated electro-mechanical energy converting devices; and a driven member pressed against this friction member under a predetermined pressure.

Claims20

Dependent claims

A two-dimensional driving ultrasonic motor characterized by comprising:

a first electro-mechanical energy converting device having opposing surfaces and being uniformly polarized in a given direction and having electrodes substantially covering both opposing surfaces;
a second electro-mechanical energy converting device laminated to said first electro-mechanical energy converting device, having opposing surfaces and being uniformly polarized in a given direction and having an electrode substantially covering one of said opposing surfaces and a divided electrode arranged on the other surface, said divided electrode having electrode portions being separated from one another along a first dividing line;
a third electro-mechanical energy converting device having opposing surfaces and being laminated to one of said first and second electro-mechanical energy converting devices, and being uniformly polarized in a given direction and having an electrode substantially covering one of said opposing surfaces and a divided electrode arranged on another one of the opposing surfaces, said divided electrode comprising electrode portions being separated along a second dividing line, said second and third devices being aligned so that said first and second dividing lines intersect substantially at right angles;
a friction member fixed to an end of said laminated electro-mechanical energy converting devices;
means for pressing a driven member against said friction member under a predetermined pressure;
and
means for applying operating signals to said first, second and third devices including means for controlling amplitude and phase of the operating signals to obtain a desired two-dimensional output.

4 more elements

A two-dimensional driving ultrasonic motor characterized by comprising:

a first electro-mechanical energy converting device uniformly polarized in a given direction;
second and third electro-mechanical energy converting devices each having first and second portions uniformly polarized in opposing directions, said first and second uniformly polarized portions arranged on opposite sides of a linear dividing line;
said second electro-mechanical energy converting device being laminated to said first electro-mechanical energy converting device;
said third electro-mechanical energy converting device being laminated to one of said first and second electro-mechanical energy converting devices;
the orientation of said second and third electro-mechanical energy devices being such that the linear dividing lines separating their uniformly polarized sections of opposing polarity are oriented at right angles relative to one another;
a friction member fixed to an end of one of said electro-mechanical energy converting devices;
and
means for pressing a driven member against said friction member under a predetermined pressure.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application: 07/865,345Filed 8 Apr 1992
Priority: JP 3-1017728 Apr 1991
Granted: 6 Sep 1994
Term ends: Not estimatedThe source records don’t support an estimate.

Classification10 codes

H10N 30/2023
Using longitudinal or thickness displacement combined with bending, shear or torsion displacement: having polygonal or rectangular shape
H02N 2/0035
Using longitudinal or radial modes combined with bending modes: cylindrical vibrators
H02N 2/026
Producing linear motion, e.g. actuators; Linear positioners ; Linear motors: by pressing one or more vibrators against the driven body
H02N 2/028
Producing linear motion, e.g. actuators; Linear positioners ; Linear motors: along multiple or arbitrary translation directions, e.g. XYZ stages