EP0132039A3 - Moisture resistant cover for an electroacoustic transducer - Google Patents
Moisture resistant cover for an electroacoustic transducer Download PDFInfo
- Publication number
- EP0132039A3 EP0132039A3 EP84303836A EP84303836A EP0132039A3 EP 0132039 A3 EP0132039 A3 EP 0132039A3 EP 84303836 A EP84303836 A EP 84303836A EP 84303836 A EP84303836 A EP 84303836A EP 0132039 A3 EP0132039 A3 EP 0132039A3
- Authority
- EP
- European Patent Office
- Prior art keywords
- moisture resistant
- electroacoustic transducer
- resistant cover
- acoustic waves
- transducer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/44—Special adaptations for subaqueous use, e.g. for hydrophone
Abstract
A capacitive type electroacoustic transducer is provided
with a moisture resistant layer (34) to allow use of the transd
ucer in wet environments. The moisture resistant layer is
fastened over a protective cover (18) and is located at a node
of the acoustic waves emitted by the transducer. A woven
polytetrafluoroethylene material is preferably used for the
moisture resistant properties as well as minimum attenuation
of the acoustic waves.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US50277083A | 1983-06-09 | 1983-06-09 | |
US502770 | 1983-06-09 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0132039A2 EP0132039A2 (en) | 1985-01-23 |
EP0132039A3 true EP0132039A3 (en) | 1986-07-23 |
Family
ID=23999340
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP84303836A Withdrawn EP0132039A3 (en) | 1983-06-09 | 1984-06-06 | Moisture resistant cover for an electroacoustic transducer |
Country Status (1)
Country | Link |
---|---|
EP (1) | EP0132039A3 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4872148A (en) * | 1984-03-08 | 1989-10-03 | Polaroid Corporation | Ultrasonic transducer for use in a corrosive/abrasive environment |
FR2683969B1 (en) * | 1991-11-15 | 1997-06-20 | Thomson Csf | SEALING MEMBRANE FOR UNDERWATER DEVICE, PARTICULARLY FOR UNDERWATER ACOUSTIC DEVICE, AND DEVICE COMPRISING SUCH A MEMBRANE. |
AU1738695A (en) * | 1994-02-03 | 1995-08-21 | Knowles Electronics, Inc. | Water submersible microphone |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3311703A (en) * | 1963-05-21 | 1967-03-28 | Carl E Grinstead | Microphone with low frequency filter |
US3944756A (en) * | 1975-03-05 | 1976-03-16 | Electro-Voice, Incorporated | Electret microphone |
US4081626A (en) * | 1976-11-12 | 1978-03-28 | Polaroid Corporation | Electrostatic transducer having narrowed directional characteristic |
GB2015299A (en) * | 1978-02-20 | 1979-09-05 | Hosiden Electronics Co | Electret microphone |
GB1559214A (en) * | 1977-12-20 | 1980-01-16 | Brown Communications Ltd Sg | Protection of devices against immersion |
GB2064263A (en) * | 1979-11-30 | 1981-06-10 | Pye Electronic Prod Ltd | Microphone unit |
-
1984
- 1984-06-06 EP EP84303836A patent/EP0132039A3/en not_active Withdrawn
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3311703A (en) * | 1963-05-21 | 1967-03-28 | Carl E Grinstead | Microphone with low frequency filter |
US3944756A (en) * | 1975-03-05 | 1976-03-16 | Electro-Voice, Incorporated | Electret microphone |
US4081626A (en) * | 1976-11-12 | 1978-03-28 | Polaroid Corporation | Electrostatic transducer having narrowed directional characteristic |
GB1559214A (en) * | 1977-12-20 | 1980-01-16 | Brown Communications Ltd Sg | Protection of devices against immersion |
GB2015299A (en) * | 1978-02-20 | 1979-09-05 | Hosiden Electronics Co | Electret microphone |
GB2064263A (en) * | 1979-11-30 | 1981-06-10 | Pye Electronic Prod Ltd | Microphone unit |
Also Published As
Publication number | Publication date |
---|---|
EP0132039A2 (en) | 1985-01-23 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
AK | Designated contracting states |
Designated state(s): AT BE CH DE FR GB IT LI LU NL SE |
|
17P | Request for examination filed |
Effective date: 19850722 |
|
PUAL | Search report despatched |
Free format text: ORIGINAL CODE: 0009013 |
|
AK | Designated contracting states |
Kind code of ref document: A3 Designated state(s): AT BE CH DE FR GB IT LI LU NL SE |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
18D | Application deemed to be withdrawn |
Effective date: 19870124 |