US4166967A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Piezoelectric resonator with acoustic reflectors
Assignee: Individual
•
Filing: 1977-10-18
•
Granted: 1979-09-04
•
Expires: 1997-10-18
Abstract
Abstract A piezoelectric resonator, particularly for pressure, acceleration, temperature and load transducers, consisting of a resonator core having holding discs on its opposite sides, said holding discs being formed of solid body layers, said layers consisting alternatively of materials having strongly different acoustic impedance for unit cross-sectional area.
Inventors
- 👤 Ewald Benes
- 👤 Dieter Hammer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:06
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/15; H03H9/17; A; A61; A61B; A61B8/00; A61B8/54; A61B8/546; G; G01; G01K; G01K7/00; G01K7/32; G01L; G01L1/00; G01L1/16; G01L1/162; G01L9/00; G01L9/0001; G01L9/0008; G01L9/0022; G01P; G01P15/00; G01P15/02; G01P15/08; G01P15/09; G01P15/0907; H03H9/02; H03H9/02007; H03H9/02086; H03H9/02094; G01N; G01N2291/00; G01N2291/02; G01N2291/028; G01N2291/02827
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
94 words
A piezoelectric resonator for pressure, acceleration, and temperature sensors comprising a resonator core having holding discs on its opposite sides, said holding discs being formed of solid body layers, the dimensions of said layers measured in the direction of propagation of the piezoelectric stimulated sound wave each are 1/4 or an odd multiple of 1/4 of the length L of the sound waves in the respective layer corresponding to the resonance frequency of the resonator core, said holding discs being acoustic reflectors, said layers consisting alternatively of materials having significantly different specific acoustic impedance.
Claim 2
Dependent Claim
94 words
A piezoelectric resonator for pressure, acceleration, and temperature sensors comprising a resonator core having holding discs on its opposite sides, said holding discs being formed of solid body layers, the dimensions of said layers measured in the direction of propagation of the piezoelectric stimulated sound wave each are 1/4 or an odd multiple of 1/4 of the length L of the sound waves in the respective layer corresponding to the resonance frequency of the resonator core, said holding discs being acoustic reflectors, said layers consisting alternatively of materials having significantly different specific acoustic impedance.
Claim 3
Dependent Claim
28 words
A piezoelectric resonator according to claim 1, wherein at least some of said layers are built up of several plys using a material having equal specific acoustic impedance.
Claim 4
Dependent Claim
59 words
A piezoelectric resonator according to claim 1, further comprising additional layers being interposed, the dimensions of said layers measured in the direction of propagation of the piezoelectric stimulated sound wave are 1/2 or an integer multiple of 1/2 of the length L of the sound wave in the respective layer corresponding to the resonance frequency of the resonator core.
Claim 5
Dependent Claim
60 words
A piezoelectric resonator according to claim 2, further comprising additional layers interposed between said holding discs, said layers having dimensions measured in the direction of propagation of the piezoelectric stimulated sound wave 1/2 or an integer multiple of 1/2 of the length L of the sound wave in the respective layer corresponding to the resonance frequency of the resonator core.
Claim 6
Dependent Claim
29 words
A piezoelectric resonator according to claim 1, wherein the outmost layer of the holding discs consists of a material having a higher specific acoustic impedance than the adjacent layer.
Claim 7
Dependent Claim
26 words
A piezoelectric resonator according to claim 1, wherein the odd-numbered and even-numbered solid body layers of the holding discs are each formed of the same material.
Claim 8
Dependent Claim
16 words
A piezoelectric resonator according to claim 1, wherein said layers of the holding discs are deposited.
Claim 9
Dependent Claim
19 words
A piezoelectric resonator according to claim 1, wherein the layers of the holding discs are made by galvanic means.
Claim 10
Dependent Claim
38 words
A piezoelectric resonator according to claim 1, wherein the adhesion of the layers among one another and to the resonator core is increased by depositing an adhesion film having a negligible thickness compared to that of said layers.
Claim 11
Dependent Claim
38 words
A piezoelectric resonator according to claim 3, wherein the adhesion of the layers among one another and to the resonator core is increased by depositing an adhesion film having a negligible thickness compared to that of said layers.
Claim 12
Dependent Claim
26 words
A piezoelectric resonator according to claim 1, wherein adhesion of the layers among one another and to the resonator core is attained by means of epitaxy.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-09-03 | 1983-03-05 | 1983-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-09-03 | 1987-03-05 | 1987-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-09-03 | 1991-03-05 | 1991-09-04 | $7700.00 | Window Closed / Lapsed |