US4182937A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mechanically biased semiconductor strain sensitive microphone
Assignee: International Standard Electric Corp
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Filing: 1978-09-21
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Granted: 1980-01-08
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Expires: 1998-09-21
Abstract
Abstract A piezo-electric transducer element is disclosed which is formed by selected etchings from boron doped silicon. The transducer includes a diaphragm and a spring lever adapted to bias the transducer element into a state of strain so that a vibration of the diaphragm is transmitted to the transducer element. The transducer element is particularly suitable for use in a telephone microphone.
Inventors
- 👤 John C. Greenwood
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:56
CPC Classifications
H; H04; H04R; H04R21/00; H04R21/02; H04R17/00; H04R17/02
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
56 words
A microphone transducer element of the type in which acoustic vibration generates corresponding resistance changes, including: at least two semiconductor plate members; an integral flexible laminar semiconductor support upon which said plate members are situated; and at least one laminar semiconductor filament for interconnecting said plate members such that said at least one filament is strain-sensitive.
Claim 2
Dependent Claim
56 words
A microphone transducer element of the type in which acoustic vibration generates corresponding resistance changes, including: at least two semiconductor plate members; an integral flexible laminar semiconductor support upon which said plate members are situated; and at least one laminar semiconductor filament for interconnecting said plate members such that said at least one filament is strain-sensitive.
Claim 3
Dependent Claim
20 words
A transducer element as claimed in claim 1, further including means for maintaining said at least one filament in tension.
Claim 4
Dependent Claim
19 words
A transducer element as claimed in claim 1 wherein said semiconductor plate members are comprised of boron doped silicon.
Claim 5
Dependent Claim
26 words
A transducer element as claimed in claims 1, 2 or 3 wherein the resistance of said semiconductor is within the range of 50 to 200 ohm.
Claim 6
Dependent Claim
82 words
A microphone assembly comprising: housing means; flexible diaphrgam means mounted in said housing means; semiconductor strain gauge transducer element; first and second contact springs for securing said transducer element to said housing; spring lever means mounted on said housing proximate to said contact springs for biasing said transducer element into a state of strain; and fulcrum means mounted on said diaphragm and in abutment with the spring lever means such that acoustic vibrations of the diaphragm are transmitted to said transducer element.
Claim 7
Dependent Claim
82 words
A microphone assembly comprising: housing means; flexible diaphrgam means mounted in said housing means; semiconductor strain gauge transducer element; first and second contact springs for securing said transducer element to said housing; spring lever means mounted on said housing proximate to said contact springs for biasing said transducer element into a state of strain; and fulcrum means mounted on said diaphragm and in abutment with the spring lever means such that acoustic vibrations of the diaphragm are transmitted to said transducer element.
Claim 8
Dependent Claim
87 words
In a telephone subscriber instrument, a microphone assembly comprising: housing means; flexible diaphragm means mounted in said housing means; semiconductor strain gauge transducer element; first and second contact springs for securing said transducer element to said housing; spring lever means mounted on said housing proximate to said contact springs for biasing said transducer element into a state of strain; and fulcrum means mounted on said diaphragm and in abutment with the spring lever means such that acoustic vibrations of the diaphragm are transmitted to said transducer element.
Claim 9
Dependent Claim
87 words
In a telephone subscriber instrument, a microphone assembly comprising: housing means; flexible diaphragm means mounted in said housing means; semiconductor strain gauge transducer element; first and second contact springs for securing said transducer element to said housing; spring lever means mounted on said housing proximate to said contact springs for biasing said transducer element into a state of strain; and fulcrum means mounted on said diaphragm and in abutment with the spring lever means such that acoustic vibrations of the diaphragm are transmitted to said transducer element.
References Cited (Backward Citations)
US3383475A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-01-07 | 1983-07-09 | 1984-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-01-07 | 1987-07-09 | 1988-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-01-07 | 1991-07-09 | 1992-01-08 | $7700.00 | Window Closed / Lapsed |