AU532596B2 - Improving the coupling and directivity of electroacoustic transducers - Google Patents
Improving the coupling and directivity of electroacoustic transducersInfo
- Publication number
- AU532596B2 AU532596B2 AU68238/81A AU6823881A AU532596B2 AU 532596 B2 AU532596 B2 AU 532596B2 AU 68238/81 A AU68238/81 A AU 68238/81A AU 6823881 A AU6823881 A AU 6823881A AU 532596 B2 AU532596 B2 AU 532596B2
- Authority
- AU
- Australia
- Prior art keywords
- vibratable member
- coupled
- acoustic
- sound
- air
- 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
- 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
- G10K11/02—Mechanical acoustic impedances; Impedance matching, e.g. by horns; Acoustic resonators
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Transducers For Ultrasonic Waves (AREA)
- Piezo-Electric Transducers For Audible Bands (AREA)
- Ultra Sonic Daignosis Equipment (AREA)
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
- Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
Abstract
A broadly tuned directional acoustic transducer system for transmitting and receiving airborne sound, which provides enhanced efficiency and reduced cost without undue narrowing of bandwidth, makes use of an acoustic transducer element (2) coupled to a vibratable member (10), e.g. a plate, having a higher order flexural mode resonance at approximately the desired frequency of operation, the vibratable member being coupled to the air through low-hysteresis acoustic propagation material having an acoustic impedance much less than that of the vibratable member and much greater than that of the air. The material is disposed so that in the desired direction of propagation there is no substantial reduction of sound intensity in the far field resulting from cancellation occasioned by interaction of sound radiated from adjacent antinodal zones. Preferably the thickness of the material is such that it acts as an efficient acoustic impedance matching transformer. Preferably, the transducer element is piezoelectric and coupled to the centre of a disc-shaped vibratable member (10) to which the coupling material is applied in rings (16, 18, 20).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US14201480A | 1980-04-21 | 1980-04-21 | |
| US142014 | 1993-10-28 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| AU6823881A AU6823881A (en) | 1981-10-29 |
| AU532596B2 true AU532596B2 (en) | 1983-10-06 |
Family
ID=22498204
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU68238/81A Expired AU532596B2 (en) | 1980-04-21 | 1981-03-11 | Improving the coupling and directivity of electroacoustic transducers |
Country Status (8)
| Country | Link |
|---|---|
| EP (1) | EP0039986B1 (en) |
| JP (1) | JPS56165497A (en) |
| AT (1) | ATE2981T1 (en) |
| AU (1) | AU532596B2 (en) |
| CA (1) | CA1136257A (en) |
| DE (1) | DE3160140D1 (en) |
| MX (1) | MX149462A (en) |
| ZA (1) | ZA81876B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU577721B2 (en) * | 1986-01-27 | 1988-09-29 | Endress & Hauser Gmbh & Co. | Acoustic transducer system |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19601656B4 (en) * | 1996-01-18 | 2009-07-16 | Valeo Schalter Und Sensoren Gmbh | Steamed ultrasonic transducer |
| DE19620133C2 (en) * | 1996-05-18 | 2001-09-13 | Endress Hauser Gmbh Co | Sound or ultrasonic sensor |
| DE19758243A1 (en) * | 1997-12-30 | 1999-07-15 | Endress Hauser Gmbh Co | Sound converter system |
| US8186229B2 (en) * | 2010-01-06 | 2012-05-29 | Daniel Measurement And Control, Inc. | Ultrasonic flow meter having a port cover assembly |
| US9050628B2 (en) | 2012-01-30 | 2015-06-09 | Piezotech Llc | Pulse-echo acoustic transducer |
| DE102013211606A1 (en) * | 2013-06-20 | 2014-12-24 | Robert Bosch Gmbh | Environment sensing device with ultrasonic transducer, and motor vehicle with such environment sensing device |
| DE102013211619A1 (en) * | 2013-06-20 | 2014-12-24 | Robert Bosch Gmbh | Environment sensing device with ultrasonic transducer, and motor vehicle with such environment sensing device |
| CN120175690B (en) * | 2025-04-27 | 2025-11-11 | 常州威图流体科技有限公司 | High-end vibration fan |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3218488A (en) * | 1961-08-01 | 1965-11-16 | Branson Instr | Transducer |
| JPS437677Y1 (en) * | 1965-01-02 | 1968-04-05 | ||
| FR1546591A (en) * | 1966-08-10 | 1968-11-22 | Univ Ohio State | Electro-mechanical transducers |
| JPS5929816B2 (en) * | 1975-08-20 | 1984-07-23 | 松下電器産業株式会社 | ultrasonic probe |
| US4078160A (en) * | 1977-07-05 | 1978-03-07 | Motorola, Inc. | Piezoelectric bimorph or monomorph bender structure |
-
1980
- 1980-12-19 CA CA000367186A patent/CA1136257A/en not_active Expired
-
1981
- 1981-01-29 EP EP81300378A patent/EP0039986B1/en not_active Expired
- 1981-01-29 DE DE8181300378T patent/DE3160140D1/en not_active Expired
- 1981-01-29 AT AT81300378T patent/ATE2981T1/en not_active IP Right Cessation
- 1981-02-10 ZA ZA00810876A patent/ZA81876B/en unknown
- 1981-03-09 MX MX186289A patent/MX149462A/en unknown
- 1981-03-11 AU AU68238/81A patent/AU532596B2/en not_active Expired
- 1981-03-14 JP JP3718881A patent/JPS56165497A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU577721B2 (en) * | 1986-01-27 | 1988-09-29 | Endress & Hauser Gmbh & Co. | Acoustic transducer system |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0134000B2 (en) | 1989-07-17 |
| ZA81876B (en) | 1982-02-24 |
| CA1136257A (en) | 1982-11-23 |
| EP0039986B1 (en) | 1983-04-06 |
| EP0039986A1 (en) | 1981-11-18 |
| AU6823881A (en) | 1981-10-29 |
| MX149462A (en) | 1983-11-08 |
| JPS56165497A (en) | 1981-12-19 |
| ATE2981T1 (en) | 1983-04-15 |
| DE3160140D1 (en) | 1983-05-11 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MK14 | Patent ceased section 143(a) (annual fees not paid) or expired |