US5233137A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Protective anc loudspeaker membrane
Assignee: Visteon Global Technologies Inc
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Filing: 1992-06-08
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Granted: 1993-08-03
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Expires: 2012-06-08
Abstract
Abstract A transducer arrangement for active noise cancellation signals provides an acoustically permeable membrane between ports in direct communication with the noise propagating conduit and the transducers delivering sound pulses to the port. A housing defines at least one chamber exposed to at least one face of a transducer diaphragm, and each chamber is connected in fluid communication with the conduit through at least one port. The chamber is partitioned by the membrane to include chamber portions with a predetermined volumetric relationship. In a preferred embodiment where the transducer arrangement is coupled to a motor vehicle exhaust conduit, the membrane is preferably a silicone impregnated polyurethane film reinforced with aromatic polyamide fibers. Such a member provides a waterproof, acoustically permeable partition between the port and any adjacent speaker face that can withstand high temperatures. In a two transducer arrangement, two diaphragm faces are exposed to a common chamber including two membranes positioned on opposite sides of the port communicating with the chamber.
Inventors
- 👤 Earl R. Geddes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 08:27
CPC Classifications
F; F01; F01N; F01N13/00; F01N13/16; F01N1/00; F01N1/06; F01N1/065; F01N1/16; F01N1/22; G; G10; G10K; G10K11/00; G10K11/16; G10K11/175; G10K11/178; G10K11/1785; G10K11/17857; G10K11/17861; G10K11/1787; G10K11/17879; G10K11/17881; G10K2210/00; G10K2210/10; G10K2210/112; G10K2210/128; G10K2210/1282; G10K2210/12822; G10K2210/30; G10K2210/301; G10K2210/3045; G10K2210/321; G10K2210/3227; G10K2210/32272
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
68 words
An active noise cancellation muffler for a motor vehicle exhaust conduit including at least one transducer with a diaphragm, comprising: a housing including walls defining an enclosed chamber exposed to at least one side of said transducer diaphragm; a port extending through a housing wall for acoustic communication between said chamber and the exhaust conduit; and an acoustically permeable partition separating said transducer diaphragm from the exhaust conduit.
Claim 2
Dependent Claim
68 words
An active noise cancellation muffler for a motor vehicle exhaust conduit including at least one transducer with a diaphragm, comprising: a housing including walls defining an enclosed chamber exposed to at least one side of said transducer diaphragm; a port extending through a housing wall for acoustic communication between said chamber and the exhaust conduit; and an acoustically permeable partition separating said transducer diaphragm from the exhaust conduit.
Claim 3
Dependent Claim
18 words
The invention as defined in claim 1 wherein said partition divides said chamber into inner and outer compartments.
Claim 4
Dependent Claim
22 words
The invention as defined in claim 1 wherein said housing comprises a tubular peripheral wall and two longitudinally spaced apart end walls.
Claim 5
Dependent Claim
14 words
The invention as defined in claim 3 wherein said tubular peripheral wall is cylindrical.
Claim 6
Dependent Claim
12 words
The invention as defined in claim 4 wherein said partition is round.
Claim 7
Dependent Claim
60 words
The invention as defined in claim 1 wherein said muffler comprises two transducer diaphragms and wherein said housing includes walls defining a first common chamber exposed to one side of each transducer diaphragm, a second chamber exposed to the other side of one said transducer diaphragm and a third chamber exposed to the other side of the other transducer diaphragm.
Claim 8
Dependent Claim
50 words
The invention as defined in claim 6 wherein said housing includes a first port acoustically coupling said common chamber with the exhaust conduit, a second port for acoustically coupling said second chamber to the exhaust conduit and a third port for acoustically coupling said third chamber to the exhaust conduit.
Claim 9
Dependent Claim
37 words
The invention as defined in claim 7 wherein said common chamber includes a first partition separating said first port from said one transducer diaphragm and a second partition separating said first port from said other transducer diaphragm.
Claim 10
Dependent Claim
14 words
The invention as defined in claim 1 wherein said partition comprises a flexible membrane.
Claim 11
Dependent Claim
13 words
The invention as defined in claim 9 wherein said flexible member is taut.
Claim 12
Dependent Claim
14 words
The invention as defined in claim 9 wherein said membrane comprises a polymer membrane.
Claim 13
Dependent Claim
13 words
The invention as defined in claim 9 wherein said membrane includes reinforcing fibers.
Claim 14
Dependent Claim
16 words
The invention as defined in claim 12 wherein said reinforcing fibers are made of aromatic polyamide.
Claim 15
Dependent Claim
16 words
The invention as defined in claim 13 wherein said membrane is made of Kevlar impregnated silicone.
Claim 16
Dependent Claim
14 words
The invention as defined in claim 12 wherein said member includes a polyethylene coating.
Claim 17
Dependent Claim
59 words
A transducer housing for active noise cancellation in a conduit comprising: a peripheral wall defining an enclosed chamber; a port extending through said peripheral wall in fluid communication with said chamber and the conduit; a transducer mount for securing a transducer with its diaphragm exposed to said chamber; an acoustically permeable partition for separating said mount from said port.
Claim 18
Dependent Claim
59 words
A transducer housing for active noise cancellation in a conduit comprising: a peripheral wall defining an enclosed chamber; a port extending through said peripheral wall in fluid communication with said chamber and the conduit; a transducer mount for securing a transducer with its diaphragm exposed to said chamber; an acoustically permeable partition for separating said mount from said port.
Claim 19
Independent Claim
52 words
A method for coupling transducers to a motor vehicle exhaust conduit comprising: enclosing at least one side of at least one transducer diaphragm in a housing chamber; porting said chamber in fluid communication with the exhaust conduit; partitioning said chamber with an acoustically permeable membrane separating said transducer diaphragm from said port.
Claim 20
Independent Claim
52 words
A method for coupling transducers to a motor vehicle exhaust conduit comprising: enclosing at least one side of at least one transducer diaphragm in a housing chamber; porting said chamber in fluid communication with the exhaust conduit; partitioning said chamber with an acoustically permeable membrane separating said transducer diaphragm from said port.
Claim 21
Dependent Claim
19 words
The invention as defined in claim 17 wherein said partitioning step comprises installing a silicone impregnated polyurethane, fiber-reinforced membrane.
Claim 22
Dependent Claim
15 words
The invention as defined in claim 18 wherein said fiber is made of aromatic polyamide.
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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) | 1996-08-02 | 1997-02-01 | 1997-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-08-02 | 2001-02-01 | 2001-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-08-02 | 2005-02-01 | 2005-08-03 | $7700.00 | Window Closed / Lapsed |