An improved transducer array includes a two-dimensional array of multilayer actuators, capable of producing very high displacement with low input voltage, integrally packaged with conditioning electronics. Preferred microcomposite actuators use multiple layers of stacked electrostrictive ceramics and...http://www.google.com.au/patents/US5629578?utm_source=gb-gplus-sharePatent US5629578 - Integrated composite acoustic transducer array
