US4313071A
Expired / Lapsed
US
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Piezo-electric quartz resonator
Assignee: Centre Electronique Horloger SA
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Filing: 1979-09-07
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Granted: 1982-01-26
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Expires: 1999-09-07
Abstract
Abstract The resonator according to the invention comprises at least one quartz crystal in the form of a rectangular thin plate, of which the length l is directed along an axis X', the width w along an axis Y' and the thickness t along an axis Z', and which vibrates in a contour mode. The axis Z' is situated in the plane of the electrical axis X and optical axis Z of the crystal and forms with the axis Z an angle φ such that 16°<φ<36° and the axis Y' forms with the mechanical axis Y of the crystal an angle θ such that 10°<θ<30° This resonator presents a zero temperature coefficient of the first order and is not dependent to any critical extent on the dimensional ratio between the sides w and l of the plate; the temperature coefficients of higher order are very small. The piezo-electric coupling is such that the optimized mode of oscillation is the only one excited in practice.
Inventors
- 👤 Jean Hermann
- 👤 Claude Bourgeois
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:01
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/02; H03H9/02007; H03H9/02015; H03H9/02023; H03H9/02157; H03H9/05; H03H9/0595; H03H9/15; H03H9/17; H03H9/19
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
33 words
Piezo-electric resonator comprising at least one quartz crystal in the form of a rectangular thin plate vibrating in a contour mode, wherein the cutting angle is within the range z x wt (16°-36°)/(10°-30°).
Claim 2
Dependent Claim
33 words
Piezo-electric resonator comprising at least one quartz crystal in the form of a rectangular thin plate vibrating in a contour mode, wherein the cutting angle is within the range z x wt (16°-36°)/(10°-30°).
Claim 3
Dependent Claim
42 words
Resonator according to claim 1, wherein the ratio between the width w and the length l of the plate is between 0.5 n and 0.8 n, when n is the order of the harmonic of the fundamental mode of vibration being used.
Claim 4
Dependent Claim
15 words
Resonator according to claim 1, wherein the cutting angle is approximately z x wt 26°/20°.
Claim 5
Dependent Claim
30 words
Resonator according to claim 2, wherein the ratio w/l is approximately equal to 2/3n, when n is the order of the harmonic of the fundamental mode of vibration being used.
Claim 6
Dependent Claim
35 words
Resonator according to claims 1 or 2, comprising a quartz crystal having the form of a tuning-fork, of which the arms are formed by two rectangular plates having a ratio w/l of 0.5 to 0.8.
Claim 7
Dependent Claim
65 words
Resonator according to claims 1 or 2, comprising a quartz crystal having an active part which has the form of a rectangular plate equivalent as regards its dimensions to a plate composed of at least one rectangular plate having a ratio w/l of 0.5 to 0.8 and a passive part presenting at least one extension, the passive part being disposed adjacent to the active part.
Claim 8
Dependent Claim
37 words
Resonator according to claim 6, wherein the active part comprises a rectangular plate having a ratio w/l of 0.5 to 0.8 and the passive part comprises two triangles which prolong the active part in the length direction.
Claim 9
Dependent Claim
57 words
Resonator according to claim 3, wherein the active part comprises a rectangular plate having a ratio w/l of 0.5 to 0.8 and the passive part comprises a rectangular frame completely surrounding the active part, the two parts being connected to one another by means of extensions fast with each of the small sides of the active part.
Claim 10
Dependent Claim
88 words
Resonator according to claim 1, wherein the plate is partially metallised on each of its large faces, this metallisation having the form of a strip parallel to the length of the plate and these strips being offset from one another with respect to the central plane of the plate, this arrangement being so devised that if one of the metallisations is positively polarised and the other is negatively polarised, the electrical field presents one component along the axis Y', in a direction opposite ot its component along Z'.
References Cited (Backward Citations)
US4178566A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-01-25 | 1985-07-27 | 1986-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-01-25 | 1989-07-27 | 1990-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-01-25 | 1993-07-27 | 1994-01-26 | $7700.00 | Window Closed / Lapsed |