Longitudinal quartz crystal resonator
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United States of America Patent
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-
Mar 19, 1991
Grant Date -
N/A
app pub date -
Sep 7, 1989
filing date -
Sep 9, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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