A vibration wave device having a resilient member, and electro-mechanical energy conversion means for inducing a travelling vibration wave in the resilient member, the travelling vibration wave being used as a drive source, includes means provided on at least one member of the vibration wave device at...http://www.google.com.au/patents/US5300850?utm_source=gb-gplus-sharePatent US5300850 - Vibration wave motor
