Piezoelectric energy conversion and electroluminescent display device

Claim 1

AN ENERGY CONVERSION SYSTEM FOR PRODUCING AN ELASTIC WAVE IN A SHEET OF ACOUSTICALLY TRANSMITTING MATERIAL COMPRISING (A) AN ELECTRODE GROUP CONSISTING OF AT LEAST TWO SPACED ADJACENT PARALLEL INPUT ELECTRODES OF EQUAL WIDTHS AFFIXED TO ONE SURFACE OF SAID SHEET, THE DISTANCE BETWEEN ADJACENT INPUT ELECTRODES BEING SMALL RELATIVE TO THE LENGTH OF SAID SHEET MEASURED ALONG A LINE THROUGH SAID ELECTRODES AND PERPENDICULAR THERETO, (B) COMMON ELECTRODE MEANS AFFIXED TO THE OTHER SURFACE OF SAID SHEET OPPOSITE SAID ELECTRODE GROUP, AND (C) VOLTAGE GENERATING MEANS HAVING A PLURALITY OF OUTPUT TERMINALS EACH COUPLED TO A CORRESPONDING ONE OF SAID INPUT ELECTRODES AND A COMMON TERMINAL COUPLED TO SAID COMMON ELECTRODE MEANS, SAID VOLTAGE GENERATING MEANS SEQUENTIALLY APPLYING VOLTAGE STEPS BETWEEN EACH OF SAID INPUT ELECTRODES AND SAID COMMON ELECTRODES MEANS, THE INTERVAL BETWEEN APPLICATION OF SAID VOLTAGE STEPS TO ADJACENT INPUT ELECTRODES BEING EQUAL TO THE TIME REQUIRED FOR AN ELASTIC WAVE TO BE PROPAGATED BETWEEN ADJACENT INPUT ELECTRODES.