Longitudinal quartz crystal resonator

Details Longitudinal quartz crystal resonator Longitudinal quartz crystal resonator

1989-09-07

1991-03-19

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310361, 310368, H01L 4108

Patent

active

050013831

ABSTRACT:
A small longitudinal quartz crystal resonator has an intermediate oscillating frequency from 500 KHz to 4.2 MHz, a reduced energy loss of vibration, a small equivalent series resistance and zero temperature coefficient. The resonator has a longitudinal vibrational portion of rod-like shape connected at its central portion to a pair of supporting portions through each bridge portion. Each supporting portion is shaped to avoid suppression of oscillation of the vibrational portion. The vibrational and supporting portions are formed integrally by etching method. Driving electrodes are formed on etched faces of the vibrational portion perpendicular to X-axis. The resonator is composed of a quartz crystal plate cut out by cut angle of -2.degree. to +4.degree. around X-axis with respect to a Z-plate. The vibrational portion may have tapered end portions to increase the oscillating frequency in high frequency range up to 4.2 MHz.

REFERENCES:
patent: 4350918 (1982-09-01), Sato
patent: 4633124 (1986-12-01), Kawashima

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