US4475014A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acoustical transducer
Assignee: HARMAN-MOTIVE Inc A CORP OF DE
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Filing: 1982-09-13
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Granted: 1984-10-02
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Expires: 2002-09-13
Abstract
Abstract A bimorph bender acoustical transducer driver or motor element in which no center vane is necessary. Elimination of the vane reduces the dynamic mass of the driver so that a thicker, more rugged piezoelectric wafer can be used to achieve the same acoustical response characteristics as were possible with prior art drivers having vanes and thinner piezoelectric wafers subject to damage.
Inventors
- 👤 John A. King
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:46
CPC Classifications
H; H04; H04R; H04R23/00; H04R23/02; H04R1/00; H04R1/20; H04R1/22; H04R1/24; H04R17/00; H10; H10N; H10N30/00; H10N30/20; H10N30/204
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
133 words
A bender comprising a first piezoelectric crystal having first and second opposed side surfaces, a second piezoelectric crystal having first and second opposed side surfaces, means providing an electrical coupling to the first side of the first crystal, means providing an electrical coupling to the first side of the second crystal, means providing an electrical coupling to the second sides of the first and second crystals, the last-mentioned coupling means including means providing a notch in the perimeter of the first crystal for exposing a region of the second side of the second crystal near its perimeter and an electrical contact provided on the exposed region, and a layer of adhesive cementing the perimeter of the second side of the first crystal to the perimeter of the second side of the second crystal.
Claim 2
Dependent Claim
133 words
A bender comprising a first piezoelectric crystal having first and second opposed side surfaces, a second piezoelectric crystal having first and second opposed side surfaces, means providing an electrical coupling to the first side of the first crystal, means providing an electrical coupling to the first side of the second crystal, means providing an electrical coupling to the second sides of the first and second crystals, the last-mentioned coupling means including means providing a notch in the perimeter of the first crystal for exposing a region of the second side of the second crystal near its perimeter and an electrical contact provided on the exposed region, and a layer of adhesive cementing the perimeter of the second side of the first crystal to the perimeter of the second side of the second crystal.
Claim 3
Dependent Claim
26 words
The bender of claim 1 wherein said means providing an electrical coupling to the second sides of the first and second crystals comprises a conductive adhesive.
Claim 4
Dependent Claim
13 words
The bender of claim 2 wherein the conductive adhesive is a silver-filled epoxy.
Claim 5
Dependent Claim
21 words
The bender of claim 1 or 3 wherein the first and second crystals are generally flat circular wafers of piezoelectric material.
Claim 6
Dependent Claim
11 words
The bender of claim 1 wherein the adhesive comprises a cyanoacrylate.
Claim 7
Dependent Claim
11 words
The bender of claim 1 wherein the adhesive comprises an epoxy.
Claim 8
Dependent Claim
162 words
A piezoelectric acoustic transducer comprising first and second piezoelectric crystals, each having first and second opposed side surfaces, means providing an electrical coupling to the first side of the first crystal, means providing an electrical coupling to the first side of the second crystal, means providing an electrical coupling to the second sides of the first and second crystals, the means for providing an electrical coupling to the second sides of the crystals including means providing a notch in the perimeter of one of the first and second crystals for exposing a region of the second side of the other of the first and second crystals near its perimeter and an electrical contact provided on the exposed region, a layer of adhesive cementing the perimeter of the second side of the first crystal and the perimeter of the second side of the second crystal, an acoustical transducer diaphragm, and means for coupling the diaphragm to the first side of the first crystal.
Claim 9
Dependent Claim
162 words
A piezoelectric acoustic transducer comprising first and second piezoelectric crystals, each having first and second opposed side surfaces, means providing an electrical coupling to the first side of the first crystal, means providing an electrical coupling to the first side of the second crystal, means providing an electrical coupling to the second sides of the first and second crystals, the means for providing an electrical coupling to the second sides of the crystals including means providing a notch in the perimeter of one of the first and second crystals for exposing a region of the second side of the other of the first and second crystals near its perimeter and an electrical contact provided on the exposed region, a layer of adhesive cementing the perimeter of the second side of the first crystal and the perimeter of the second side of the second crystal, an acoustical transducer diaphragm, and means for coupling the diaphragm to the first side of the first crystal.
Claim 10
Dependent Claim
26 words
The transducer of claim 7 wherein said means providing an electrical coupling to the second sides of the first and second crystals comprises a conductive adhesive.
Claim 11
Dependent Claim
21 words
The transducer of claim 7 or 8 wherein the first and second crystals are generally flat circular wafers of piezoelectric material.
Claim 12
Dependent Claim
139 words
An acoustic transducer comprising first and second piezoelectric crystals, each having first and second opposed side surfaces, means providing an electrical coupling to the first side of the first crystal, means providing an electrical coupling to the first side of the second crystal, a conductive adhesive between the second sides of the first and second crystals, means providing an electrical coupling to the second side of one of the first and second crystals, a layer of non-conductive adhesive extending perimetrally around the layer of conductive adhesive for cementing the perimeter of the second side of the first crystal and the perimeter of the second side of the second crystal to electrically isolate the conductive adhesive, a diaphragm, means for supporting the diaphragm, and means for coupling a region of the diaphragm to the first side of the first crystal.
Claim 13
Dependent Claim
139 words
An acoustic transducer comprising first and second piezoelectric crystals, each having first and second opposed side surfaces, means providing an electrical coupling to the first side of the first crystal, means providing an electrical coupling to the first side of the second crystal, a conductive adhesive between the second sides of the first and second crystals, means providing an electrical coupling to the second side of one of the first and second crystals, a layer of non-conductive adhesive extending perimetrally around the layer of conductive adhesive for cementing the perimeter of the second side of the first crystal and the perimeter of the second side of the second crystal to electrically isolate the conductive adhesive, a diaphragm, means for supporting the diaphragm, and means for coupling a region of the diaphragm to the first side of the first crystal.
Claim 14
Dependent Claim
158 words
A bender consisting essentially of a first piezoelectric crystal having first and second opposed side surfaces, a second piezoelectric crystal having first and second opposed side surfaces, means providing an electrical coupling to the first side of the first crystal, means providing an electrical coupling to the first side of the second crystal, means providing an electrical coupling to the second sides of the first and second crystals, and a layer of adhesive cementing the perimeter of the second side of the first crystal to the perimeter of the second side of the second drystal, one of the first and second crystals including means providing an access passageway through said one of the first and second crystals exposing a region of the second surface of the other of the first and second crystals, the means providing an electrical coupling to the second sides including means providing an electrical coupling to the region exposed through said access providing means.
Claim 15
Dependent Claim
158 words
A bender consisting essentially of a first piezoelectric crystal having first and second opposed side surfaces, a second piezoelectric crystal having first and second opposed side surfaces, means providing an electrical coupling to the first side of the first crystal, means providing an electrical coupling to the first side of the second crystal, means providing an electrical coupling to the second sides of the first and second crystals, and a layer of adhesive cementing the perimeter of the second side of the first crystal to the perimeter of the second side of the second drystal, one of the first and second crystals including means providing an access passageway through said one of the first and second crystals exposing a region of the second surface of the other of the first and second crystals, the means providing an electrical coupling to the second sides including means providing an electrical coupling to the region exposed through said access providing means.
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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) | 1987-10-02 | 1988-04-02 | 1988-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-10-02 | 1992-04-02 | 1992-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-10-02 | 1996-04-02 | 1996-10-02 | $7700.00 | Window Closed / Lapsed |