A piezoelectric linear motor using a double-mode vibrator was constructed with one of the vibration modes being the first longitudinal and the other, the second bending. In order to reduce driving voltage, a multilayer piezoelectric ceramics vibrator prepared by a cofiring method was used. Moreover, we proposed a new type of supportive mount for the vibrator to facilitate the construction of the motor. In the new method the vibrator is bonded to an attachment plate by an elastic layer. In this paper, characteristics of the motor are described.
A piezoelectric transformer has been developed for use as a step-up transformer that is built into the CCFL (cold cathode fluorescent lamp) inverter. The CCFL is used for LCD (liquid crystal display) backlight functions. We developed a new type of piezoelectric transformer which has an alternately poled structure. It is able to illuminate a CCFL by applying half of the input voltage of the Rosen type piezoelectric transformer.
The structure of piezoelectric transformers were studied to enlarge the output power
capacity. The power parameter m
A
2
2 was proposed to predict the performance of the high-power piezoelectric transformers. In a former report, we proposed a new-structure
piezoelectric transformer named alternately poled piezoelectric transformer (APT). Its step-up
ratio was twice as large as that of the Rosen type transformer, in spite of the single layer
structure. In this study, the APT with 1.5 wavelength resonant mode was modified to increase
the output power capacity and the multilayer structure was utilized to enlarge the step-up ratio.
As a result, both a high step-up ratio of 23 and the output power capacity of 7.1 W were
accomplished under a load of 100 k Ω.
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