US4754187A
Expired / Lapsed
US
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High-Q stress-compensated crystal device
Assignee: United States Department of the Army
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Filing: 1987-09-08
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Granted: 1988-06-28
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Expires: 2007-09-08
Abstract
Abstract A doubly rotated, stress and temperature compensated quartz crystal resonator. The crystal cuts are arbitrarity designated the SK1 and SK2 cuts. Lateral field excitation is used to excite only the b-mode of vibration (fast quasi-shear) and suppress the c mode (slow quasi-shear). Exclusive excitation of the b mode produces a resonator with a higher Q and lower phase noise than otherwise achievable.
Inventors
- 👤 John A. Kosinski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 03:11
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/02; H03H9/02007; H03H9/02015; H03H9/02023; H03H9/15; H03H9/17; H03H9/19
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
160 words
A quartz piezoelectric resonator comprising a monolithic thin plate of piezoelectric material having a doubly rotated cut positioned at an orientation with respect to a standard rotational symbol YXwl (φ, θ), defined in terms of the X, Y, Z crystallographic axes and the major faces at polar angles φ and θ, wherein thickness is in the Y direction, length in the X direction and width in the Z direction, and wherein φ is the direction of first rotation about said Z axis with respect to the X axis and θ is the direction of second rotation about an X' axis with respect to the Z axis, where the angle θ is in the range -27.5°±4.0°, and where the angle φ is in the range 13.0°±4.0°, said plate having two opposed electrodes both positioned upon a said major face of said plate at an angle ψ with respect to said X' axis where said angle ψ is in the range -15°±15°.
Claim 2
Dependent Claim
160 words
A quartz piezoelectric resonator comprising a monolithic thin plate of piezoelectric material having a doubly rotated cut positioned at an orientation with respect to a standard rotational symbol YXwl (φ, θ), defined in terms of the X, Y, Z crystallographic axes and the major faces at polar angles φ and θ, wherein thickness is in the Y direction, length in the X direction and width in the Z direction, and wherein φ is the direction of first rotation about said Z axis with respect to the X axis and θ is the direction of second rotation about an X' axis with respect to the Z axis, where the angle θ is in the range -27.5°±4.0°, and where the angle φ is in the range 13.0°±4.0°, said plate having two opposed electrodes both positioned upon a said major face of said plate at an angle ψ with respect to said X' axis where said angle ψ is in the range -15°±15°.
Claim 3
Dependent Claim
159 words
A quartz piezoelectric resonator comprising a monolithic thin plate of piezoelectric material having a doubly rotated cut positioned at an orientation with respect to a standard rotational symbol YXwl (φ, θ), defined in terms of the X, Y, Z crystallographic axes and the major faces at polar angles φ and θ, wherein thickness is in the Y direction, length in the X direction and width in the Z direction, and wherein φ is the direction of first rotation about the Z axis with respect to the X axis and θ is the direction of second rotation about an X' axis with respect to said Z axis, where the angle θ is in the range -30.0°±4.0°, and where the angle φ is in the range 14.2°±4.0°, said plate having two opposed electrodes both positioned upon a said major face of said plate at angle ψ with respect to said X' axis where said angle ψ is in the range -45°±15°.
Claim 4
Dependent Claim
159 words
A quartz piezoelectric resonator comprising a monolithic thin plate of piezoelectric material having a doubly rotated cut positioned at an orientation with respect to a standard rotational symbol YXwl (φ, θ), defined in terms of the X, Y, Z crystallographic axes and the major faces at polar angles φ and θ, wherein thickness is in the Y direction, length in the X direction and width in the Z direction, and wherein φ is the direction of first rotation about the Z axis with respect to the X axis and θ is the direction of second rotation about an X' axis with respect to said Z axis, where the angle θ is in the range -30.0°±4.0°, and where the angle φ is in the range 14.2°±4.0°, said plate having two opposed electrodes both positioned upon a said major face of said plate at angle ψ with respect to said X' axis where said angle ψ is in the range -45°±15°.
Claim 5
Dependent Claim
33 words
The device of claim 1 further including two additional opposed electrodes both positioned upon a second major face of said plate at the same said angle ψ with respect to said X' axis.
Claim 6
Dependent Claim
33 words
The device of claim 2 further including two additional opposed electrodes both positioned upon a second major face of said plate at the same said angle ψ with respect to said X' axis.
Claim 7
Dependent Claim
12 words
The device of claim 1 wherein said plate has a plano-convex shape.
Claim 8
Dependent Claim
12 words
The device of claim 2 wherein said plate has a plano-convex shape.
Claim 9
Dependent Claim
12 words
The device of claim 1 wherein said plate has a convex-convex shape.
Claim 10
Dependent Claim
12 words
The device of claim 2 wherein said plate has a convex-convex shape.
References Cited (Backward Citations)
US4625138A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-06-28 | 1991-12-28 | 1992-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-06-28 | 1995-12-28 | 1996-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-06-28 | 1999-12-28 | 2000-06-28 | $7700.00 | Window Closed / Lapsed |