FR2517161B1 - Transducteur a electret comportant une membrane a electret d'epaisseur variable - Google Patents
Transducteur a electret comportant une membrane a electret d'epaisseur variableInfo
- Publication number
- FR2517161B1 FR2517161B1 FR8219315A FR8219315A FR2517161B1 FR 2517161 B1 FR2517161 B1 FR 2517161B1 FR 8219315 A FR8219315 A FR 8219315A FR 8219315 A FR8219315 A FR 8219315A FR 2517161 B1 FR2517161 B1 FR 2517161B1
- Authority
- FR
- France
- Prior art keywords
- electret
- variable thickness
- membrane
- transducer
- electret 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.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H11/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by detecting changes in electric or magnetic properties
- G01H11/06—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by detecting changes in electric or magnetic properties by electric means
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/18—Methods or devices for transmitting, conducting or directing sound
- G10K11/26—Sound-focusing or directing, e.g. scanning
- G10K11/32—Sound-focusing or directing, e.g. scanning characterised by the shape of the source
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R19/00—Electrostatic transducers
- H04R19/01—Electrostatic transducers characterised by the use of electrets
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49002—Electrical device making
- Y10T29/49226—Electret making
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- General Physics & Mathematics (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
- Piezo-Electric Transducers For Audible Bands (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US06/323,696 US4429192A (en) | 1981-11-20 | 1981-11-20 | Electret transducer with variable electret foil thickness |
Publications (2)
Publication Number | Publication Date |
---|---|
FR2517161A1 FR2517161A1 (fr) | 1983-05-27 |
FR2517161B1 true FR2517161B1 (fr) | 1986-03-14 |
Family
ID=23260342
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR8219315A Expired FR2517161B1 (fr) | 1981-11-20 | 1982-11-18 | Transducteur a electret comportant une membrane a electret d'epaisseur variable |
Country Status (7)
Country | Link |
---|---|
US (1) | US4429192A (fr) |
JP (1) | JPS5896497A (fr) |
CA (1) | CA1186047A (fr) |
DE (1) | DE3242554A1 (fr) |
FR (1) | FR2517161B1 (fr) |
NL (1) | NL8204512A (fr) |
SE (1) | SE453349B (fr) |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5388163A (en) * | 1991-12-23 | 1995-02-07 | At&T Corp. | Electret transducer array and fabrication technique |
US5619476A (en) * | 1994-10-21 | 1997-04-08 | The Board Of Trustees Of The Leland Stanford Jr. Univ. | Electrostatic ultrasonic transducer |
US5894452A (en) * | 1994-10-21 | 1999-04-13 | The Board Of Trustees Of The Leland Stanford Junior University | Microfabricated ultrasonic immersion transducer |
AU2923397A (en) | 1996-04-18 | 1997-11-07 | California Institute Of Technology | Thin film electret microphone |
US5952645A (en) * | 1996-08-27 | 1999-09-14 | California Institute Of Technology | Light-sensing array with wedge-like reflective optical concentrators |
US5982709A (en) * | 1998-03-31 | 1999-11-09 | The Board Of Trustees Of The Leland Stanford Junior University | Acoustic transducers and method of microfabrication |
US6310429B1 (en) * | 1998-05-18 | 2001-10-30 | Nortel Networks Limited | Acoustic wave transducer device |
DK79198A (da) * | 1998-06-11 | 1999-12-12 | Microtronic As | Fremgangsmåde til fremstilling af en transducer med en membran med en forudbestemt opspændingskraft |
AU5030100A (en) * | 1999-05-19 | 2000-12-05 | California Institute Of Technology | High performance mems thin-film teflon electret microphone |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR874440A (fr) * | 1940-02-12 | 1942-08-06 | Atlas Werke Ag | Appareil pour émissions ou réceptions dirigées d'énergie ondulatoire |
US3372245A (en) * | 1963-01-25 | 1968-03-05 | Matsushita Electric Ind Co Ltd | Electrostatic electro-acoustic transducer |
US4311874A (en) * | 1979-12-17 | 1982-01-19 | Bell Telephone Laboratories, Incorporated | Teleconference microphone arrays |
-
1981
- 1981-11-20 US US06/323,696 patent/US4429192A/en not_active Expired - Lifetime
-
1982
- 1982-11-10 SE SE8206383A patent/SE453349B/sv not_active IP Right Cessation
- 1982-11-15 CA CA000415614A patent/CA1186047A/fr not_active Expired
- 1982-11-18 FR FR8219315A patent/FR2517161B1/fr not_active Expired
- 1982-11-18 DE DE19823242554 patent/DE3242554A1/de not_active Ceased
- 1982-11-19 NL NL8204512A patent/NL8204512A/nl not_active Application Discontinuation
- 1982-11-20 JP JP57202911A patent/JPS5896497A/ja active Pending
Also Published As
Publication number | Publication date |
---|---|
US4429192A (en) | 1984-01-31 |
SE453349B (sv) | 1988-01-25 |
JPS5896497A (ja) | 1983-06-08 |
SE8206383L (sv) | 1983-05-21 |
NL8204512A (nl) | 1983-06-16 |
CA1186047A (fr) | 1985-04-23 |
DE3242554A1 (de) | 1983-05-26 |
FR2517161A1 (fr) | 1983-05-27 |
SE8206383D0 (sv) | 1982-11-10 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
ST | Notification of lapse |