Monolithic piezoelectric bimorph

A piezoelectric bimorph is formed by uniformly poling a homogeneous sheet of piezoelectric material in a first direction and thereafter establishing a substantially linear temperature gradient across the sheet while concurrently applying a reverse poling field across the sheet of a magnitude selecte...

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Bibliographische Detailangaben
1. Verfasser:	MICHAELIS, ALAN JOHN
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	BASIC ELECTRIC ELEMENTS CONVERSION OR DISTRIBUTION OF ELECTRIC POWER DEAF-AID SETS ELECTRIC COMMUNICATION TECHNIQUE ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR ELECTRICITY FOR PERFORMING MECHANICAL WORK IN GENERAL GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL GENERATION LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKEACOUSTIC ELECTROMECHANICAL TRANSDUCERS METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICALVIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY PERFORMING OPERATIONS PUBLIC ADDRESS SYSTEMS SEMICONDUCTOR DEVICES TRANSPORTING
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Beschreibung
Zusammenfassung:	A piezoelectric bimorph is formed by uniformly poling a homogeneous sheet of piezoelectric material in a first direction and thereafter establishing a substantially linear temperature gradient across the sheet while concurrently applying a reverse poling field across the sheet of a magnitude selected for substantially depoling the middle layers of the sheet, poling the hotter layers in the reverse direction and leaving the cooler layers poled in the first direction. The impedance of the piezoelectric material is monitored to terminate reverse poling when the otter and cooler layers are substantially equally poled.