US3732446A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electroacoustic transducer resistant to external mechanical vibrations
Assignee: AT&T Inc
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Filing: 1971-12-13
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Granted: 1973-05-08
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Expires: 1991-12-13
Abstract
Abstract An electromechanical transducer element is supported within a transducer housing by a resilient mounting assembly which includes a mass element and a pair of conical washers. The washer stiffness and the mass element are adjusted for a natural resonant frequency below the transducer operating frequency band. Externally generated mechanical vibrations applied to the transducer housing are transmitted through the mounting assembly to the transducer largely at low frequencies, and thus do not interfere with transducer operation in the frequency band of interest.
Inventors
- 👤 H Bryant
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:06
CPC Classifications
B; B06; B06B; B06B1/00; B06B1/02; B06B1/06; B06B1/0644; B06B1/0648; G; G10; G10K; G10K11/00; G10K11/004
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
74 words
An electroacoustic transducer comprising an electromechanical transducing element, a housing defining an internal chamber having an inner bottom wall for containing said element, and means resistant to externally generated mechanical vibrations for supporting said element within said chamber, said supporting means including a mass element, a first resilient conical washer for supporting said mass element on said bottom wall, and a second resilient conical washer for supporting said transducing element on said mass element.
Claim 2
Dependent Claim
74 words
An electroacoustic transducer comprising an electromechanical transducing element, a housing defining an internal chamber having an inner bottom wall for containing said element, and means resistant to externally generated mechanical vibrations for supporting said element within said chamber, said supporting means including a mass element, a first resilient conical washer for supporting said mass element on said bottom wall, and a second resilient conical washer for supporting said transducing element on said mass element.
Claim 3
Dependent Claim
20 words
The invention defined in claim 1 wherein said transducing element comprises a ferroelectric ceramic material bonded to a metallic diaphragm.
Claim 4
Dependent Claim
44 words
The invention defined in claim 2 wherein said transducer has an operating frequency band having a lower limit f1, said first washer has a stiffness s, said mass element has a mass m, and wherein 1/2 pi Square Root s/m is less than f1.
Claim 5
Dependent Claim
48 words
The invention defined in claim 1 wherein said first washer comprises a hollow frustum of a cone making a cone angle of approximately 25* with the vertical and said second washer comprises a hollow frustum of a cone making a cone angle of approximately 25* with the vertical.
Claim 6
Dependent Claim
29 words
The invention defined in claim 4 wherein said transducing element includes a ferroelectric ceramic selected from the group consisting of barium titanate, lead titanate-lead zirconate, and sodium potassium niobate.
Claim 7
Dependent Claim
69 words
An electroacoustic transducer comprising an electromechanical transducing element, a housing having an internal chamber and an inner bottom wall for containing said element, a mass member, first means for supporting said mass member on said bottom wall; and second means for supporting said element on said mass member, wherein said first means and said second means include a first resilient conical washer, and a second resilient conical washer, respectively.
Claim 8
Dependent Claim
69 words
An electroacoustic transducer comprising an electromechanical transducing element, a housing having an internal chamber and an inner bottom wall for containing said element, a mass member, first means for supporting said mass member on said bottom wall; and second means for supporting said element on said mass member, wherein said first means and said second means include a first resilient conical washer, and a second resilient conical washer, respectively.
Claim 9
Dependent Claim
34 words
The invention defined in claim 6 wherein said transducer has an operating frequency band, and said mass member and said first means are arranged for a natural resonance at a frequency below said band.
Claim 10
Dependent Claim
32 words
The invention defined in claim 7 wherein said first and said second conical washers each comprise a hollow frustum of a cone with a cone angle of approximately 25* to the vertical.
Claim 11
Dependent Claim
52 words
The invention defined in claim 8 wherein said mass element includes a central body portion and an outwardly extending annular flange, said first washer includes a first apex end face, said second washer includes a second apex end face, and said first and second apex end faces are fastened to said flange.
Claim 12
Dependent Claim
57 words
The invention defined in claim 9 wherein said second washer further includes a base face and an upwardly extending annular flange integral with said base, said upwardly extending annular flange defines an inwardly facing annular groove, said transducing element includes a piezoelectric ceramic material affixed to a diaphragm, and said diaphragm is fastened to said annular groove.
Claim 13
Dependent Claim
25 words
The invention defined in claim 10 wherein said ceramic material is selected from the group consisting of barium titanate, lead-titanate-lead zirconate, and sodium potassium niobate.
Claim 14
Dependent Claim
17 words
The invention defined in claim 11 wherein said transducing element is square and said diaphragm is round.
References Cited (Backward Citations)
US3311761A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-05-07 | 1976-11-06 | 1977-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-07 | 1980-11-06 | 1981-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-07 | 1984-11-06 | 1985-05-08 | $7700.00 | Window Closed / Lapsed |