Piezoelectric ceramic resonator with asymmetrically rough edge
Abstract
Abstract A PIEZOELECTRIC CERAMIC RESONATOR WHICH IS FREE FROM SPURIOUS VIBRATIONS WHEN OPERATING IN A HIGH FREQUENCY RANGE. THE RESONATOR IS COMPOSED OF A THIN PIEZOELECTRIC CERAMIC PLATE HAVING AN ELECTROMECHANICAL COUPLING FACTOR FOR THE THICKNESS-EXTENSIONAL MODE VIBRATION AT LEAST FOUR TIMES HIGHER THAN THE MECHANICAL COUPLING FACTOR FOR THE CONTOUR MODE. THE THIN CERAMIC PLATE HAS A THICKNESS FOR CAUSING IT TO VIBRATE AT A PRESELECTED FREQUENCY THE THICKNESS-EXTENSIONAL VIBRATION MODE AT A FREQUENCY RANGE HIGHER THAN TWENTY MEGACYCLES AND HAS AN ASYMMETRICALLY ROUGH PERIPHERAL EDGE HAVING A ROUGHNESS ON THE ORDER OF ONE QUARTER WAVELENGTH OF THE PRESELECTED FREQUENCY FOR ELIMINATING UNWANTED VIBRATIONS. ELECTRODES ARE PROVIDED ON SAID CERAMIC PLATE FOR CAUSING SAID VIBRATION WHEN AN ALTERNATING CURRENT IS SUPPLIED THERETO. D R A W I N G
Inventors
- 👤 T Nagata
- 👤 Y Nakajima
Bibliographic Details
Claims Analysis
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