PIEZOELECTRIC BIMORPH

• Main Authors: TANIGUCHI TSUTOMU, OOBA MASATOSHI, NOZAKI YUTAKA, SATOU RIYUUICHI
• Format: Patent
• Language: English
• Published: 31.01.1984
• Subjects: DEAF-AID SETS; ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKEACOUSTIC ELECTROMECHANICAL TRANSDUCERS; PUBLIC ADDRESS SYSTEMS

PURPOSE:To improve reliability of the operation of a piezoelectric bimorph by superposing a piezoelectric element which is elongated in a direction perpendicular to the polarizing axis direction and a piezoelectric element which is contracted by applying an electric field to a polarizing axis direction, thereby reducing the ageing change. CONSTITUTION:A piezoelectric element 1 is elongated in a direction perpendicular to the polarizing axis direction when an electric field is applied to the same direction as the polarizing axis direction designated by an arrow A, and a piezoelectric element 2 is contracted in the direction perpendicular to the polarizing axis direction when an electric field is applied to the same direction as the polarizing direction. The element 1, 2 and bonded via a metal electrode plate 3 so that the polarizing axis directions are opposed, conductive layers 4, 5 are formed on the respective one side surfaces, the layers 4, 5 are connected to one electrode terminal of a DC power source 6, and the plate 3 is connected to the other electrode terminal of the power source 6. In this manner, out of polarization is not product, but stable piezoelectricity can be maintained.