Miniature GT-cut quartz resonator
AssigneeSeiko Instruments & Electronics Ltd.
InventorOsamu Ochiai
Life of this patent
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Abstract
The GT-cut quartz resonator resonated by two longitudinal modes and provided with the masses for frequency-temperature characteristics adjustment and frequency adjustment. The frequency-temperature characteristics and the frequency of the GT-cut quartz resonator are adjusted by eliminating the masses. Consequently, the quartz resonator adjusted to the normal frequency and having the excellent frequency-temperature characteristics is attained. Further the GT-cut quartz resonator of small and thin size is attained by making the resonant portion and the supporting portions in one piece by photolithographic technique.
Claims15
A GT-cut quartz resonator comprising:
- a quartz crystal thin plate having a resonant portion having opposed relatively short sides and opposed relatively long sides, at least one supporting portion, and at least one bridge portion connecting the resonant and supporting portions;
- said resonant, supporting and bridge portions all being integrally formed as a single piece from the quartz crystal thin plate, said thin plate comprising a quartz crystal Y plate rotated around the X axis through an angle of 49.degree. to 56.degree., and the Y plate being further rotated through an angle of .+-.(40.degree. to 50.degree.) inside the major surfaces thereof;
- and masses disposed along portions of the long sides of the resonant portion at a first set of locations at which the frequency-temperature coefficient is not effectively changed by the addition or reduction of the amount of the masses and at a second set of locations at which both the frequency-temperature coefficient and the resonance frequency are effectively charged by the addition or reduction of the amount of the masses.
A method for manufacturing a GT-cut quartz resonator having a resonant portion including opposed relatively short sides and opposed relatively long sides, at least one supporting portion, and at least one bridge portion connecting the resonant and supporting portions, comprising the steps of:
- adjusting the frequency-temperature coefficient by the addition or reduction of the amount of masses on the resonant portion where the frequency-temperature coefficient and the resonance frequency are effectively changed by the addition or reduction of the amount of the masses;
- and thereafter adjusting the resonance frequency by the addition or reduction of the amount of the masses on the resonant portion where the frequency-temperature coefficient is not effectively changed by the addition or reduction of the amount of the masses.
A coupling resonator comprising:
- a single piece of piezoelectric material having a resonant portion having opposed major surfaces and opposed relatively short sides and opposed relatively long sides, at least one supporting portion, and at least one bridge portion interconnecting the resonant and supporting portions and being configured to resonate at a preselected main resonance frequency;
- a first set of masses disposed on at least one major surface along the marginal edge portions of the long sides thereof at locations effective to adjust the frequency-temperature characteristics of the resonator;
- and a second set of masses disposed on at least one major surface along the marginal edge portions of the long sides thereof at locations effective to adjust the main resonance frequency of the resonator without disturbing the adjusted frequency-temperature characteristics effected by the first set of masses.
Dependencies are inferred from the claim text.