A vibration wave driving apparatus for obtaining driving force in 3D directions comprises a vibration member having a shape that is line-symmetrical with respect to two orthogonal axes, electro-mechanical energy conversion elements which can selectively excite in the vibration member three different...http://www.google.com.au/patents/US6819029?utm_source=gb-gplus-sharePatent US6819029 - Vibration wave driving apparatus
