Two-dimensionally driving ultrasonic motor

Claim 1

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.