LiTaO.sub.3 Piezoelectric resonator

Details LiTaO.sub.3 Piezoelectric resonator LiTaO.sub.3 Piezoelectric resonator

1983-02-18

1984-06-12

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310368, 310348, H01L 4108

Patent

active

044544448

ABSTRACT:
A piezoelectric resonator which resonates in thickness shear mode. The piezoelectric resonator includes a strip shaped resonance chip made of an X-cut plate of lithium tantalate crystal and having a rectangular cross-section. Electrodes are formed at the center portion with respect to the longitudinal direction of the resonance chip on each of two X-plane surfaces. The width of the electrodes is equal to the width of the resonance chip. The longitudinal direction of the resonance chip inclines with respect to the Y-axis by an angle of 50.degree..+-.2' in the clockwise direction in the X-plane so as to make the longitudinal direction of the resonance chip coincide with the displacement direction of primary oscillation of the crystal. Optimal ratios of the dimensions of the resonance chip and terminal connectors at the ends of the resonance chip are given to reduce spurious response. The temperature characteristic is optimized by selecting rotation angles about the Y-and Z-axes in relation to the amount of trapped energy.

REFERENCES:
patent: 3525885 (1970-08-01), Ballman et al.
Low Frequency Resonatore of Lithium Tantalate, by M. Onoe, Proceedings, 27th Ann. Frequency Control Symposium, Cherry Hill, N.J., USA, Jun. 12-14, 1973, pp. 42-49.

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