Patent US4637489A successfully refreshed from Google Patents.
US4637489A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electroacoustic transducer
Assignee: Nippon Chemi Con Corp
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Filing: 1985-09-04
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Granted: 1987-01-20
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Expires: 2005-09-04
Abstract
Abstract An electroacoustic transducer has a front air chamber in front of the diaphragm that vibrates upon receiving sound waves or produces sound waves upon vibration and a back air chamber provided in the rear of the diaphragm. The electroacoustic transducer of the present invention further includes an auxiliary air chamber that is provided in the rear of the back air chamber that is coupled thereto by through holes. The auxiliary air chamber is divided into at least two smaller air chambers which are coupled to each other by a small orifice.
Inventors
- 👤 Masaya Iwanaka
- 👤 Seiji Kajiwara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 11:01
CPC Classifications
H; H04; H04R; H04R1/00; H04R1/20; H04R1/22
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
203 words
An electroacoustic transducer comprising: a diaphragm having a front side and a rear side; a front air chamber provided on the front side of the diaphragm, said diaphragm vibrating upon receiving sound waves and producing sound waves upon vibration, said front air chamber having first through holes positioned at a first end thereof; a back air chamber, provided on the rear side of said diaphragm and behind said front air chamber, said back air chamber being formed integrally with said front air chamber, said back air chamber being communicated with said front air chamber via said first through holes, said back air chamber having second through holes at a rear end thereof; and an auxiliary air chamber, provided in the rear of said back air chamber and which communicates with said auxiliary air chamber by said second through holes, said auxiliary air chamber being divided into first and second smaller air chamber, said second smaller air chamber not being communicated with said back air chamber, but being communicated with said first smaller air chamber by a small orifice, said auxiliary air chamber including a bridge extending from one wall of said auxiliary air chamber toward an opposing wall to form said small orifice.
Claim 2
Dependent Claim
203 words
An electroacoustic transducer comprising: a diaphragm having a front side and a rear side; a front air chamber provided on the front side of the diaphragm, said diaphragm vibrating upon receiving sound waves and producing sound waves upon vibration, said front air chamber having first through holes positioned at a first end thereof; a back air chamber, provided on the rear side of said diaphragm and behind said front air chamber, said back air chamber being formed integrally with said front air chamber, said back air chamber being communicated with said front air chamber via said first through holes, said back air chamber having second through holes at a rear end thereof; and an auxiliary air chamber, provided in the rear of said back air chamber and which communicates with said auxiliary air chamber by said second through holes, said auxiliary air chamber being divided into first and second smaller air chamber, said second smaller air chamber not being communicated with said back air chamber, but being communicated with said first smaller air chamber by a small orifice, said auxiliary air chamber including a bridge extending from one wall of said auxiliary air chamber toward an opposing wall to form said small orifice.
Claim 3
Dependent Claim
25 words
An electroacoustic transducer according to claim 1 wherein said auxiliary chamber comprises a module which is attached to the rear of said back air chamber.
Claim 4
Dependent Claim
18 words
An electroacoustic transducer according to claim 1, wherein said small orifice is between 100 and 200 μm wide.
Claim 5
Dependent Claim
16 words
An electroacoustic transducer according to claim 1, wherein said small orifice is approximately 100 μm wide.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-01-19 | 1990-07-21 | 1991-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-01-19 | 1994-07-21 | 1995-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-01-19 | 1998-07-21 | 1999-01-20 | $7700.00 | Window Closed / Lapsed |