Patent US4368401A successfully refreshed from Google Patents.
US4368401A
Expired / Lapsed
US
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Transducer plate for piezo-electrical transducers
Assignee: Siemens AG
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Filing: 1981-01-22
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Granted: 1983-01-11
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Expires: 2001-01-22
Abstract
Abstract A transducer plate for piezo-electrical transducers has a piezo-electrical layer or member applied thereon. Unwanted oscillations, in particular the fourth partial oscillation, are attenuated by providing a thickness of the adhesive layer chosen for attenuation properties, and which is thicker than prior art adhesive layers.
Inventors
- 👤 Erwin Martin
- 👤 Konrad Walliser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:55
CPC Classifications
H; H04; H04R; H04R1/00; H04R1/20; H04R1/22; H04R17/00; H04R2499/00; H04R2499/10; H04R2499/11
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
103 words
A transducer plate for telephone technology piezo-electrical transducers, comprising: a carrier plate and a piezo-ceramic member bound to the plate with an adhesive layer applied on one side thereof; electrodes on both sides of the piezo-ceramic member; the adhesive layer having a thickness selected to have an attenuating influence on excessive rises in resonance; and the adhesive layer having a thickness which amounts approximately to 20 to 50% of a thickness of a piezo-ceramic member having a diameter of 200 to 350 μm, and approximately 10 to 30% of a thickness of a carrier plate having a diameter of 40 to 45 mm.
Claim 2
Dependent Claim
103 words
A transducer plate for telephone technology piezo-electrical transducers, comprising: a carrier plate and a piezo-ceramic member bound to the plate with an adhesive layer applied on one side thereof; electrodes on both sides of the piezo-ceramic member; the adhesive layer having a thickness selected to have an attenuating influence on excessive rises in resonance; and the adhesive layer having a thickness which amounts approximately to 20 to 50% of a thickness of a piezo-ceramic member having a diameter of 200 to 350 μm, and approximately 10 to 30% of a thickness of a carrier plate having a diameter of 40 to 45 mm.
Claim 3
Dependent Claim
24 words
A transducer plate according to claim 1 wherein the adhesive layer thickness is selected to have an attenuating influence on the fourth partial oscillation.
Claim 4
Dependent Claim
32 words
A transducer plate according to claim 1 wherein the adhesive layer has a thickness of approximately 35% of the thickness of the piezo-ceramic member having a diameter of 200 to 350 mm.
Claim 5
Dependent Claim
30 words
A transducer according to claim 1 wherein the adhesive layer has a thickness of approximately 25% of thickness of the carrier plate having a diameter of 40 to 45 mm.
Claim 6
Dependent Claim
24 words
A transducer plate according to claim 1 wherein the adhesive layer is applied on one side over the entire surface of the carrier plate.
Claim 7
Dependent Claim
19 words
A transducer plate according to claim 1 wherein the piezo-ceramic member covers only a part of the carrier plate.
Claim 8
Dependent Claim
121 words
A telephone technology piezo-electrical transducer system, comprising: a carrier plate having a piezo-ceramic element bound to one surface of the plate by an adhesive layer; electrodes connecting to respective sides of the piezo-ceramic member; and the adhesive layer having a thickness selected to have an attenuating influence on an excessive rise in resonance due to a fourth partial oscillation, said thickness being provided in a range of approximately 20 to 50% of a thickness of the piezo-ceramic member, said piezo-ceramic member having a diameter of 200-350 μm, and said thickness of the adhesive layer also lying within a range of 10 to 30% of a thickness of the carrier plate, said carrier plate having a diameter of 40 to 45 mm.
Claim 9
Dependent Claim
121 words
A telephone technology piezo-electrical transducer system, comprising: a carrier plate having a piezo-ceramic element bound to one surface of the plate by an adhesive layer; electrodes connecting to respective sides of the piezo-ceramic member; and the adhesive layer having a thickness selected to have an attenuating influence on an excessive rise in resonance due to a fourth partial oscillation, said thickness being provided in a range of approximately 20 to 50% of a thickness of the piezo-ceramic member, said piezo-ceramic member having a diameter of 200-350 μm, and said thickness of the adhesive layer also lying within a range of 10 to 30% of a thickness of the carrier plate, said carrier plate having a diameter of 40 to 45 mm.
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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) | 1986-01-10 | 1986-07-12 | 1987-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-01-10 | 1990-07-12 | 1991-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-01-10 | 1994-07-12 | 1995-01-11 | $7700.00 | Window Closed / Lapsed |