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US 5,001,383 AGranted
Longitudinal quartz crystal resonator
AssigneeSeiko Electronic Components Ltd.
InventorHirofumi Kawashima
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AssigneeSeiko Electronic Components Ltd.
InventorHirofumi Kawashima
Estimating the term…
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.
A longitudinal quartz crystal resonator comprising:
A longitudinal quartz crystal resonator comprising:
A longitudinal quartz crystal resonator comprising:
A longitudinal quartz crystal resonator comprising:
A longitudinal quartz crystal resonator comprising:
Dependencies are inferred from the claim text.