PIEZOELECTRIC TRANSDUCER HAVING FIRST AND SECOND CERAMIC SHEETS ALTERNATELY STACKED WITH EACH OTHER FOR ENHANCING TEMPERATURE STABILITY

摘要

PURPOSE: A piezoelectric transducer is provided to reduce the degradation of properties in spite of the variation of external temperature by stacking alternately a first ceramic sheet with a positive temperature coefficient and a second ceramic sheet with a negative temperature coefficient with each other. CONSTITUTION: A ceramic stack structure is formed on an insulating dummy layer. The ceramic stack structure is completed by stacking alternately a plurality of first and second ceramic sheets. The first ceramic sheets have a positive temperature coefficient and the second ceramic sheets have a negative temperature coefficient.