Patent US4413198A successfully refreshed from Google Patents.
US4413198A
Expired / Lapsed
US
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Piezoelectric transducer apparatus
Assignee: CTS Corp
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Filing: 1981-12-30
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Granted: 1983-11-01
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Expires: 2001-12-30
Abstract
Abstract An electroacoustic loudspeaker apparatus is provided including a piezoelectric driver element, the opposed major surfaces of which are acoustically coupled into first and second resonant structures. The first resonant structure exhibits a resonant frequency less than the resonant frequency of the driver and the second resonant structure exhibits a resonant frequency greater than the resonant frequency of the driver thus resulting in a broadened or enhanced frequency response.
Inventors
- 👤 Jonathan R. Bost
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 08:49
CPC Classifications
G; G10; G10K; G10K11/00; G10K11/08; H; H04; H04R; H04R1/00; H04R1/20; H04R1/22; H04R1/225; H04R17/00; H04R17/10
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
100 words
An electroacoustic device comprising: piezoelectric driver means, having opposed major surfaces, for converting electrical signals applied thereto into acoustic energy radiating from each of said major surfaces, said driver means exhibiting a first predetermined resonant frequency; first Helmholtz resonator means, acoustically coupled to one major surface of said driver means, and exhibiting appropriate dimensions for resonating at a second resonant frequency less than said first resonant frequency, and second Helmholtz resonator means, acoustically coupled to the remaining major surface of said driver means, and exhibiting appropriate dimensions for resonating at a third resonant frequency greater than said first resonant frequency.
Claim 2
Dependent Claim
100 words
An electroacoustic device comprising: piezoelectric driver means, having opposed major surfaces, for converting electrical signals applied thereto into acoustic energy radiating from each of said major surfaces, said driver means exhibiting a first predetermined resonant frequency; first Helmholtz resonator means, acoustically coupled to one major surface of said driver means, and exhibiting appropriate dimensions for resonating at a second resonant frequency less than said first resonant frequency, and second Helmholtz resonator means, acoustically coupled to the remaining major surface of said driver means, and exhibiting appropriate dimensions for resonating at a third resonant frequency greater than said first resonant frequency.
Claim 3
Dependent Claim
14 words
The electroacoustic device of claim 1 wherein said piezoelectric device means comprises a monomorph.
Claim 4
Dependent Claim
14 words
The electroacoustic device of claim 1 wherein said piezoelectric driver means comprises a bimorph.
Claim 5
Dependent Claim
14 words
The electroacoustic device of claim 1 wherein said piezoelectric driver means comprises a multimorph.
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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) | 1986-10-31 | 1987-05-02 | 1987-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-10-31 | 1991-05-02 | 1991-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-10-31 | 1995-05-02 | 1995-11-01 | $7700.00 | Window Closed / Lapsed |