Patent US5041754A successfully refreshed from Google Patents.
US5041754A
Expired / Lapsed
US
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Crystal resonator with acceleration sensitivity adjustable by external circuit means
Assignee: Piezo Technology Inc
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Filing: 1990-05-09
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Granted: 1991-08-20
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Expires: 2010-05-09
Abstract
Abstract A crystal resonator device having a plurality of coupled resonators in which the relative phase and magnitude of the resonator excitation currents is controlled by electrical circuit means such as reactance components connected in series with one or more of the resonators to thereby minimize or otherwise control the acceleration sensitivity of the device.
Inventors
- 👤 Robert C. Smythe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 00:20
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/46; H03H9/54; H03H9/56; H03H9/566
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
121 words
A crystal monolithic dual resonator device with reduced sensitivity to acceleration for operation from a source of excitation current comprising: a blank of piezoelectric material, electrodes on or near said blank forming at least two resonators each having a pair of electrodes to which resonators are acoustically coupled, means for supplying the excitation current to one of the electrodes of the pair of electrodes of each resonator, and means connected to the excitation current supplying means of at least one of the resonators for modifying the magnitude and phase of the applied excitation current to control the symmetry of the excited mode of the resonator and the device in a manner for reducing frequency change of the resonator due to acceleration.
Claim 2
Dependent Claim
121 words
A crystal monolithic dual resonator device with reduced sensitivity to acceleration for operation from a source of excitation current comprising: a blank of piezoelectric material, electrodes on or near said blank forming at least two resonators each having a pair of electrodes to which resonators are acoustically coupled, means for supplying the excitation current to one of the electrodes of the pair of electrodes of each resonator, and means connected to the excitation current supplying means of at least one of the resonators for modifying the magnitude and phase of the applied excitation current to control the symmetry of the excited mode of the resonator and the device in a manner for reducing frequency change of the resonator due to acceleration.
Claim 3
Dependent Claim
16 words
A crystal resonator device as in claim 1 wherein said modifying means comprises a reactance element.
Claim 4
Dependent Claim
24 words
A crystal resonator as in claim 1 wherein the modifying means is in series between the source of excitation current and each said resonator.
Claim 5
Dependent Claim
23 words
A crystal resonator as in claim 3 further comprising additional modifying means connected in parallel with the pair of electrodes of a resonator.
Claim 6
Dependent Claim
16 words
A crystal resonator as in claim 4 wherein said additional modifying means comprises a susceptance element.
Claim 7
Dependent Claim
19 words
A crystal resonator as in claim 1 wherein a said modifying means is connected to each of said resonators.
Claim 8
Dependent Claim
16 words
A crystal resonator as in claim 5 wherein each said modifying means comprises a reactance element.
Claim 9
Dependent Claim
25 words
A crystal resonator as in claim 7 wherein each said modifying means is in series between the source of excitation current and each said resonator.
Claim 10
Dependent Claim
21 words
A crystal resonator as in claim 8 further comprising additional modifying means connected in parallel with the electrodes of a resonator.
Claim 11
Dependent Claim
16 words
A crystal resonator as in claim 9 wherein said additional modifying means comprises a susceptance element.
Claim 12
Dependent Claim
22 words
A crystal resonator as in claim 1 wherein said plurality of electrodes form four coupled resonators each having a pair of electrodes.
Claim 13
Dependent Claim
18 words
A crystal resonator as in claim 11 wherein there is a modifying means connected to each said resonator.
Claim 14
Dependent Claim
25 words
A crystal resonator as in claim 12 wherein a modifying means is connected in series between the source of excitation current and each said resonator.
Claim 15
Dependent Claim
16 words
A crystal resonator as in claim 1 wherein said plurality of electrodes form three coupled resonators.
Claim 16
Dependent Claim
51 words
A crystal resonator as in claim 6 wherein a pair of resonators are each formed by a pair of electrodes, one electrodes of each pair on each side of the blank, a said modifying means being in series between the source of excitation current and each said electrode of a resonator.
Claim 17
Dependent Claim
16 words
A crystal resonator as in claim 15 wherein each said modifying means is a reactance element.
Claim 18
Dependent Claim
32 words
A crystal resonator as in claim 1 wherein there is a modifying means in series between the source of excitation current and each electrode of the pair of electrodes of each resonator.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-08-19 | 1995-02-18 | 1995-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-08-19 | 1999-02-18 | 1999-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-08-19 | 2003-02-18 | 2003-08-20 | $7700.00 | Window Closed / Lapsed |