Patent US3578995A successfully refreshed from Google Patents.
US3578995A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electroacoustic transducers of the bilaminar flexural vibrating type
Assignee: MASSA DONALD P COHASSET
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Filing: 1969-09-22
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Granted: 1971-05-18
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Expires: 1989-09-22
Abstract
Abstract A button transducer comprises a metallic diaphragm concentrically bonded to a piezoelectric ceramic disc. A plurality of types of annular housings are provided for clamping and terminating the periphery of the diaphragm, each housing type having a central opening with a different diameter therein. The bonded diaphragm-disc assemblies are measured for resonant frequency, and the housing type is selected to tune the bonded assembly to have a predetermined resonant frequency.
Inventors
- 👤 Frank Massa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:33
CPC Classifications
H; H04; H04R; H04R17/00; G; G08; G08B; G08B13/00; G08B13/16; G08B13/1609
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
117 words
An electroacoustic transducer comprising a circular diaphragm having a diameter which is more than 15 times its thickness, a circular polarized piezoelectric ceramic disc having a diameter which is more than 10 times its thickness, bonding means for holding said diaphragm and disc rigidly bound together in concentric face-to-face relationship, the area of said ceramic disc being no greater than one-half the area of said diaphragm, an annular housing structure having an opening at one end for locating and holding said diaphragm, rigid bonding means between the peripheral surface of said diaphragm and the surface in said opening in said annular housing, and electrical connection means attached to a circular face surface of said polarized ceramic disc.
Claim 2
Dependent Claim
117 words
An electroacoustic transducer comprising a circular diaphragm having a diameter which is more than 15 times its thickness, a circular polarized piezoelectric ceramic disc having a diameter which is more than 10 times its thickness, bonding means for holding said diaphragm and disc rigidly bound together in concentric face-to-face relationship, the area of said ceramic disc being no greater than one-half the area of said diaphragm, an annular housing structure having an opening at one end for locating and holding said diaphragm, rigid bonding means between the peripheral surface of said diaphragm and the surface in said opening in said annular housing, and electrical connection means attached to a circular face surface of said polarized ceramic disc.
Claim 3
Dependent Claim
49 words
The transducer of claim 1 further characterized in that said housing structure has a second opening at its other end and closure means comprising a circular insulating disc placed between said openings to close said housing structure and seal off a compartment within which said ceramic disc is contained.
Claim 4
Dependent Claim
16 words
The transducer of claim 1 further characterized in that said diaphragm is a clamped metallic disc.
Claim 5
Dependent Claim
14 words
The transducer of claim 3 further characterized in that said metal disc is aluminum.
Claim 6
Dependent Claim
42 words
The transducer of claim 1 and a hollow tubular canister housing having said transducer attached to one end for effectively sealing said one end to close said canister housing, and closure means attached to seal the other end of said canister housing.
Claim 7
Dependent Claim
42 words
The transducer of claim 5 wherein said closure is an electrical insulator with a plurality of electrical connector terminals attached thereto for establishing electrical connections from the outside of the assembled canister housing structure to the interior of said canister housing structure.
Claim 8
Dependent Claim
22 words
The transducer of claim 6 and means for short-circuiting a pair of said electrical connector terminals to provide a continuity alarm circuit.
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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) | 1974-05-17 | 1974-11-16 | 1975-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-17 | 1978-11-16 | 1979-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-17 | 1982-11-16 | 1983-05-18 | $7700.00 | Window Closed / Lapsed |