| 摘要 |
PURPOSE:To perform operation at frequencies from sevrtsl hundreds KHz to several MHz, to facilitate manufacture, and to improve reliability, by providing a piezoelectric ceramic plate whose lengthwise center part width is less than those of both ends, and electrodes and terminals separated by separation zones. CONSTITUTION:This oscillator consists of a piezoelectric ceramic plate 10 which is polarized in the thickness direction on the whole and has a narrow-width part where the lengthwise center part has width W' is less than the width W of both end parts, electrodes 11a-11d obtained by separaing thin metallic films formed both side surfaces of the ceramic plate 10 by separation zones 13a and 13b at different lengthwise positions while the narrow-width part is sandwiched, and terminals 12a and 12b where the electrodes 11a and 11c, and 11b and 11d opposed at both the lengthwise end parts are connected mutually. When an AC voltage is applied those terminals 12a and 12b, an AC electric field is applied to the narrow-width part to cause longitudinal oscillation in the widthwise direction, and even if this longitudinal oscillation propagates to both the end parts, it is atteanuated, thereby holding the end parts tightly. The resonance frequency depends upon the width W' of the narrow-width part and even oscillators for several hundreds KkHz- several MHz band are of size which is manufactured easily. |
