US3721840A - Sound generator - Google Patents
Sound generator Download PDFInfo
- Publication number
- US3721840A US3721840A US00180397A US3721840DA US3721840A US 3721840 A US3721840 A US 3721840A US 00180397 A US00180397 A US 00180397A US 3721840D A US3721840D A US 3721840DA US 3721840 A US3721840 A US 3721840A
- Authority
- US
- United States
- Prior art keywords
- disc
- sound generator
- piezoelectric
- opening
- vibrator
- 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 - Lifetime
Links
- 229920003002 synthetic resin Polymers 0.000 claims description 5
- 239000000057 synthetic resin Substances 0.000 claims description 5
- 229920005989 resin Polymers 0.000 description 4
- 239000011347 resin Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000012858 resilient material Substances 0.000 description 3
- JRPBQTZRNDNNOP-UHFFFAOYSA-N barium titanate Chemical compound [Ba+2].[Ba+2].[O-][Ti]([O-])([O-])[O-] JRPBQTZRNDNNOP-UHFFFAOYSA-N 0.000 description 2
- 229910002113 barium titanate Inorganic materials 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 101100264195 Caenorhabditis elegans app-1 gene Proteins 0.000 description 1
- 229920002284 Cellulose triacetate Polymers 0.000 description 1
- 229920005830 Polyurethane Foam Polymers 0.000 description 1
- NNLVGZFZQQXQNW-ADJNRHBOSA-N [(2r,3r,4s,5r,6s)-4,5-diacetyloxy-3-[(2s,3r,4s,5r,6r)-3,4,5-triacetyloxy-6-(acetyloxymethyl)oxan-2-yl]oxy-6-[(2r,3r,4s,5r,6s)-4,5,6-triacetyloxy-2-(acetyloxymethyl)oxan-3-yl]oxyoxan-2-yl]methyl acetate Chemical compound O([C@@H]1O[C@@H]([C@H]([C@H](OC(C)=O)[C@H]1OC(C)=O)O[C@H]1[C@@H]([C@@H](OC(C)=O)[C@H](OC(C)=O)[C@@H](COC(C)=O)O1)OC(C)=O)COC(=O)C)[C@@H]1[C@@H](COC(C)=O)O[C@@H](OC(C)=O)[C@H](OC(C)=O)[C@H]1OC(C)=O NNLVGZFZQQXQNW-ADJNRHBOSA-N 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229920001821 foam rubber Polymers 0.000 description 1
- -1 polyethylene terephthalate Polymers 0.000 description 1
- 229920000139 polyethylene terephthalate Polymers 0.000 description 1
- 239000005020 polyethylene terephthalate Substances 0.000 description 1
- 239000011496 polyurethane foam Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000002463 transducing effect Effects 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R17/00—Piezoelectric transducers; Electrostrictive transducers
Definitions
- ABSTRACT A sound generator having a relatively thin diaphragm and a piezoelectric disc element with electrodes bonded to opposing sides thereof adhered to one side of said diaphragm and means supporting the edge of said diaphragm.
- This invention relates to a sound generator and more particularly to an improved structure for supporting the vibrator of a sound generator including a piezoelectric vibrator.
- one object of this invention resides in the provision of a sound generator having an improved vibrator supporting the structure which is simple, inexpensive, and waterproof.
- a piezoelectric vibration element made of piezoelectric material such as barium titanate and having a pair of electrodes adhered on both faces thereof is adhered to the face of a thin plate made of synthetic resin, and the thin resin plate is fixed at its circumference to a supporting base member.
- FIG. 1 is a cross-sectional view representing one embodiment of a vibrator supporting structure according to the invention
- FIG. 2 is a cross-sectional view representing another embodiment of a vibrator supporting structure according to the invention.
- FIG. 3 is a graph for use in explaining a feature of the structure of FIG. 2;
- FIG. 4 is a cross-sectional view representing a further embodiment of a vibrator supporting structure according to the invention.
- FIG. 5 is a graph for use in explaining a feature of the structure of FIG. 4.
- the vibrator is composed of a piezoelectric element 1 in the form of a circular disc of piezoelectric material such as barium titanate and a pair of electrodes 2 and 3 adhered or deposited on both faces of said piezoelectric element 1.
- the vibrator is adhered to the face of a thin circular plate 4 made of synthetic resin.
- the thin plate 4 is supported at its circumference by a supporting member 5 which is generally a portion of a housing and fixedly secured by an overlying member 6 to the member 5.
- a supporting member 5 which is generally a portion of a housing and fixedly secured by an overlying member 6 to the member 5.
- synthetic resin can be used for the thin plate 4, it has been found that polyethylene terephthalate and cellulose triacetate are especially suitable.
- the thickness of the thin plate 4 should be selected so as to maximize the transducing efficiency, and may preferably be 0.l to 0.5 millimeters, for example.
- the thin plate 4 functions as the diaphragm of the sound generator and, at the same time, serves a function of a waterproof bulkhead for the internally contained elements (not shown).
- FIG. 2 resembles the embodiment of FIG. 1 but the thin resin plate 4 of FIG. 2 has a central opening 7 and the vibrator (electrode 3) is adhered at its circumference to the resin plate 4 so as to cover the opening 7.
- the effect of the opening 7 as shown in FIG. 3 illustrates the relation of the load and sound volume to the diameter of the opening 7.
- the solid curve A shows the load in ohms
- the dashed curve B shows the sound volume in decibels.
- the load decreases and the sound volume increases with an increase in the diameter of the opening 7.
- the diameter of the opening 7 is limited by the size of the vibrator since the bonding strength of the vibrator and the thin plate 4 must not be lower than a specific value. It has been found that this allowable lowest bonding strength is reduced when the diameter of the piezoelectric element 1 is smaller than the diameter of the opening 7 to provide more efficient vibration.
- FIG. 4 includes a vibratordiaphragm structure similar to that of FIG. I, but annular resilient materials 8 and 9 are disposed between the thin resin plate 4 and the supporting members 5 and 6.
- the resilient material may be foam rubber, polyurethane foam or the like. The acoustic efficiency is increased with decrease of the density of the resilient material as shown by the density-load curve of FIG. 5.
- the vibrator supporting structure of this invention is simple in construction and inexpensive to manufacture and will provide a watertight structure for the sound generator.
- a sound generator comprising a piezoelectric disc having opposing faces, an electrode electrically connected to each face of said disc with one of said electrodes being in the form of a disc having a diameter greater than said piezoelectric disc, a thin circular synthetic resin plate having a central circular opening of a diameter greater than the diameter of said piezoelectric disc and smaller than said electrode disc, and means securing said electrode disc in overlying relationship to said opening with the piezoelectric disc disposed concentrically of said opening.
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Piezo-Electric Transducers For Audible Bands (AREA)
Abstract
A sound generator having a relatively thin diaphragm and a piezoelectric disc element with electrodes bonded to opposing sides thereof adhered to one side of said diaphragm and means supporting the edge of said diaphragm.
Description
Yamada at; 3 "mile +0 imitet SOUND GENERATOR [75] Inventor: Hayao Yamada, Kita-ku, Tokyo,
Japan [73] Assignee: Nittan Company, Limited, Tokyo,
Japan [22] Filed: Sept. 14, 1971 [21] App1.No.: 180,397
[52] US. Cl ..310/9.1,179/110 A, 310/82 [51] int. Cl. ..H04r 17/00 [58] Field of Search ..3 10/8, 8.2, 8.3, 9.1-9.4,
[5 6] References Cited UNITED STATES PATENTS 9/1965 Shoot ..179/11OA 1/1969 Kompanek ]March 20, 1973 3,683,129 8/1972 Roos et a1 ..179/11OA 3,271,596 9/ 1 966 Brinkerhoff ..310/8.3 X 3,427,481 2/1969 Lenahan et a1... ..310/8.2 2,967,957 l/l96l Massa ..310/8.3 X 2,910,545 10/1959 Glenn ..179/1l0 A 3,222,462 12/1965 Karmann et a1. 179/1 10 R 3,439,128 4/1969 Sobeletal ..179/110A Primary Examiner-J. D. Miller Assistant ExaminerMark O. Budd Att0mey-Eugene E'. Geoffrey, Jr.
[ 5 7 ABSTRACT A sound generator having a relatively thin diaphragm and a piezoelectric disc element with electrodes bonded to opposing sides thereof adhered to one side of said diaphragm and means supporting the edge of said diaphragm.
1 Claim, 5 Drawing Figures 1 SOUND GENERATOR This invention relates to a sound generator and more particularly to an improved structure for supporting the vibrator of a sound generator including a piezoelectric vibrator.
Various structures have been proposed for supporting a piezoelectric vibrator of a sound generator, but most of them are so complicated in structure that the cost of manufacture is generally high and many problems have been encountered in design and manufacture. This is especially true in the case of the design of a waterproof sound generator.
Accordingly, one object of this invention resides in the provision of a sound generator having an improved vibrator supporting the structure which is simple, inexpensive, and waterproof.
According to this invention, a piezoelectric vibration element made of piezoelectric material such as barium titanate and having a pair of electrodes adhered on both faces thereof is adhered to the face of a thin plate made of synthetic resin, and the thin resin plate is fixed at its circumference to a supporting base member.
The invention will be more clearly described hereinunder with reference to the accompanying drawings.
FIG. 1 is a cross-sectional view representing one embodiment of a vibrator supporting structure according to the invention;
FIG. 2 is a cross-sectional view representing another embodiment of a vibrator supporting structure according to the invention;
FIG. 3 is a graph for use in explaining a feature of the structure of FIG. 2;
FIG. 4 is a cross-sectional view representing a further embodiment of a vibrator supporting structure according to the invention; and
FIG. 5 is a graph for use in explaining a feature of the structure of FIG. 4.
Throughout the drawings like reference numerals are used to denote corresponding structural elements.
'Referring to FIG. 1, the vibrator is composed of a piezoelectric element 1 in the form of a circular disc of piezoelectric material such as barium titanate and a pair of electrodes 2 and 3 adhered or deposited on both faces of said piezoelectric element 1. The vibrator is adhered to the face of a thin circular plate 4 made of synthetic resin. The thin plate 4 is supported at its circumference by a supporting member 5 which is generally a portion of a housing and fixedly secured by an overlying member 6 to the member 5. Though various kinds of synthetic resin can be used for the thin plate 4, it has been found that polyethylene terephthalate and cellulose triacetate are especially suitable. The thickness of the thin plate 4 should be selected so as to maximize the transducing efficiency, and may preferably be 0.l to 0.5 millimeters, for example. As readily found from the drawing, the thin plate 4 functions as the diaphragm of the sound generator and, at the same time, serves a function of a waterproof bulkhead for the internally contained elements (not shown).
The embodiment shown in FIG. 2 resembles the embodiment of FIG. 1 but the thin resin plate 4 of FIG. 2 has a central opening 7 and the vibrator (electrode 3) is adhered at its circumference to the resin plate 4 so as to cover the opening 7. The effect of the opening 7 as shown in FIG. 3 illustrates the relation of the load and sound volume to the diameter of the opening 7. In the figure the solid curve A shows the load in ohms and the dashed curve B shows the sound volume in decibels. As clearly evident from this figure, the load decreases and the sound volume increases with an increase in the diameter of the opening 7. However, the diameter of the opening 7 is limited by the size of the vibrator since the bonding strength of the vibrator and the thin plate 4 must not be lower than a specific value. It has been found that this allowable lowest bonding strength is reduced when the diameter of the piezoelectric element 1 is smaller than the diameter of the opening 7 to provide more efficient vibration.
The embodiment of FIG. 4 includes a vibratordiaphragm structure similar to that of FIG. I, but annular resilient materials 8 and 9 are disposed between the thin resin plate 4 and the supporting members 5 and 6. The resilient material may be foam rubber, polyurethane foam or the like. The acoustic efficiency is increased with decrease of the density of the resilient material as shown by the density-load curve of FIG. 5.
As described in the above, the vibrator supporting structure of this invention is simple in construction and inexpensive to manufacture and will provide a watertight structure for the sound generator.
I claim:
1. A sound generator comprising a piezoelectric disc having opposing faces, an electrode electrically connected to each face of said disc with one of said electrodes being in the form of a disc having a diameter greater than said piezoelectric disc, a thin circular synthetic resin plate having a central circular opening of a diameter greater than the diameter of said piezoelectric disc and smaller than said electrode disc, and means securing said electrode disc in overlying relationship to said opening with the piezoelectric disc disposed concentrically of said opening.
Claims (1)
1. A sound generator comprising a piezoelectric disc having opposing faces, an electrode electrically connected to each face of said disc with one of said electrodes being in the form of a disc having a diameter greater than said piezoelectric disc, a thin circular synthetic resin plate having a central circular opening of a diameter greater than the diameter of said piezoelectric disc and smaller than said electrode disc, and means securing said electrode disc in overlying relationship to said opening with the piezoelectric disc disposed concentrically of said opening.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US18039771A | 1971-09-14 | 1971-09-14 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US3721840A true US3721840A (en) | 1973-03-20 |
Family
ID=22660307
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US00180397A Expired - Lifetime US3721840A (en) | 1971-09-14 | 1971-09-14 | Sound generator |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US3721840A (en) |
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4190784A (en) * | 1978-07-25 | 1980-02-26 | The Stoneleigh Trust, Fred M. Dellorfano, Jr. & Donald P. Massa, Trustees | Piezoelectric electroacoustic transducers of the bi-laminar flexural vibrating type |
| US4328485A (en) * | 1980-02-25 | 1982-05-04 | Potter Bronson M | Binary alarm |
| US4386241A (en) * | 1979-08-16 | 1983-05-31 | Seikosha Co., Ltd. | Piezoelectric loudspeaker |
| US4471258A (en) * | 1980-11-07 | 1984-09-11 | Hitachi, Ltd. | Piezoelectric ceramic transducer |
| FR2551573A1 (en) * | 1983-08-31 | 1985-03-08 | Kobishi Electric Co Ltd | ELECTRONIC SIREN |
| FR2553213A1 (en) * | 1983-10-11 | 1985-04-12 | Saphymo Stel | Leaktight audible alarm device and apparatus comprising it |
| US4700177A (en) * | 1983-12-23 | 1987-10-13 | Nippondenso Co., Ltd. | Sound generating apparatus with sealed air chamber between two sounding plates |
| DE3620557A1 (en) * | 1986-06-19 | 1987-12-23 | Reinhardt Fischer | Electroacoustic transducer |
| WO1988003691A1 (en) * | 1986-11-03 | 1988-05-19 | Elektro-Apparatebau Olten Ag | Acoustic signal generator |
| US5896000A (en) * | 1996-02-09 | 1999-04-20 | Vectron Laboratories, Inc. | Mounting for reducing vibration-induced side bands |
| US20020067840A1 (en) * | 2000-08-29 | 2002-06-06 | Fujihiko Kobayashi | Piezo-electric speaker |
| US20060196638A1 (en) * | 2004-07-07 | 2006-09-07 | Georgia Tech Research Corporation | System and method for thermal management using distributed synthetic jet actuators |
| US20080216699A1 (en) * | 2007-03-08 | 2008-09-11 | Nanohmics, Inc. | Non-lethal projectile for disorienting adversaries |
| US20110002485A1 (en) * | 2008-03-07 | 2011-01-06 | Nec Corporation | Piezoelectric actuator and electronic device |
| US20110127884A1 (en) * | 2009-11-27 | 2011-06-02 | Samsung Electro-Mechanics Co., Ltd. | Vibration actuator module |
| US20140367191A1 (en) * | 2012-09-26 | 2014-12-18 | Kyocera Corporation | Acoustic generator, acoustic generation device, and electronic device |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2910545A (en) * | 1954-08-30 | 1959-10-27 | Gen Electric | Transducer |
| US2967957A (en) * | 1957-09-17 | 1961-01-10 | Massa Frank | Electroacoustic transducer |
| US3206558A (en) * | 1961-09-22 | 1965-09-14 | Erie Technological Prod Inc | Microphone |
| US3222462A (en) * | 1961-09-29 | 1965-12-07 | Siemens Ag | Electroacoustic transducer |
| US3271596A (en) * | 1963-11-12 | 1966-09-06 | Boeing Co | Electromechanical transducers |
| US3423543A (en) * | 1965-06-24 | 1969-01-21 | Harry W Kompanek | Loudspeaker with piezoelectric wafer driving elements |
| US3427481A (en) * | 1965-06-14 | 1969-02-11 | Magnaflux Corp | Ultrasonic transducer with a fluorocarbon damper |
| US3439128A (en) * | 1966-05-16 | 1969-04-15 | Zenith Radio Corp | Miniature ceramic microphone |
| US3683129A (en) * | 1968-09-30 | 1972-08-08 | Philips Corp | Electroacoustic transducer having a diaphragm made of at least one layer of piezoelectric material |
-
1971
- 1971-09-14 US US00180397A patent/US3721840A/en not_active Expired - Lifetime
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2910545A (en) * | 1954-08-30 | 1959-10-27 | Gen Electric | Transducer |
| US2967957A (en) * | 1957-09-17 | 1961-01-10 | Massa Frank | Electroacoustic transducer |
| US3206558A (en) * | 1961-09-22 | 1965-09-14 | Erie Technological Prod Inc | Microphone |
| US3222462A (en) * | 1961-09-29 | 1965-12-07 | Siemens Ag | Electroacoustic transducer |
| US3271596A (en) * | 1963-11-12 | 1966-09-06 | Boeing Co | Electromechanical transducers |
| US3427481A (en) * | 1965-06-14 | 1969-02-11 | Magnaflux Corp | Ultrasonic transducer with a fluorocarbon damper |
| US3423543A (en) * | 1965-06-24 | 1969-01-21 | Harry W Kompanek | Loudspeaker with piezoelectric wafer driving elements |
| US3439128A (en) * | 1966-05-16 | 1969-04-15 | Zenith Radio Corp | Miniature ceramic microphone |
| US3683129A (en) * | 1968-09-30 | 1972-08-08 | Philips Corp | Electroacoustic transducer having a diaphragm made of at least one layer of piezoelectric material |
Cited By (21)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4190784A (en) * | 1978-07-25 | 1980-02-26 | The Stoneleigh Trust, Fred M. Dellorfano, Jr. & Donald P. Massa, Trustees | Piezoelectric electroacoustic transducers of the bi-laminar flexural vibrating type |
| US4386241A (en) * | 1979-08-16 | 1983-05-31 | Seikosha Co., Ltd. | Piezoelectric loudspeaker |
| US4328485A (en) * | 1980-02-25 | 1982-05-04 | Potter Bronson M | Binary alarm |
| US4471258A (en) * | 1980-11-07 | 1984-09-11 | Hitachi, Ltd. | Piezoelectric ceramic transducer |
| FR2551573A1 (en) * | 1983-08-31 | 1985-03-08 | Kobishi Electric Co Ltd | ELECTRONIC SIREN |
| FR2553213A1 (en) * | 1983-10-11 | 1985-04-12 | Saphymo Stel | Leaktight audible alarm device and apparatus comprising it |
| US4700177A (en) * | 1983-12-23 | 1987-10-13 | Nippondenso Co., Ltd. | Sound generating apparatus with sealed air chamber between two sounding plates |
| DE3620557A1 (en) * | 1986-06-19 | 1987-12-23 | Reinhardt Fischer | Electroacoustic transducer |
| WO1988003691A1 (en) * | 1986-11-03 | 1988-05-19 | Elektro-Apparatebau Olten Ag | Acoustic signal generator |
| US5896000A (en) * | 1996-02-09 | 1999-04-20 | Vectron Laboratories, Inc. | Mounting for reducing vibration-induced side bands |
| US20020067840A1 (en) * | 2000-08-29 | 2002-06-06 | Fujihiko Kobayashi | Piezo-electric speaker |
| US7167570B2 (en) * | 2000-08-29 | 2007-01-23 | Fujihiko Kobayashi | Piezo-electric speaker |
| US20060196638A1 (en) * | 2004-07-07 | 2006-09-07 | Georgia Tech Research Corporation | System and method for thermal management using distributed synthetic jet actuators |
| US20080216699A1 (en) * | 2007-03-08 | 2008-09-11 | Nanohmics, Inc. | Non-lethal projectile for disorienting adversaries |
| US8113689B2 (en) * | 2007-03-08 | 2012-02-14 | Nanohmics, Inc. | Non-lethal projectile for disorienting adversaries |
| US20110002485A1 (en) * | 2008-03-07 | 2011-01-06 | Nec Corporation | Piezoelectric actuator and electronic device |
| US8670578B2 (en) * | 2008-03-07 | 2014-03-11 | Nec Corporation | Piezoelectric actuator and electronic device |
| US20110127884A1 (en) * | 2009-11-27 | 2011-06-02 | Samsung Electro-Mechanics Co., Ltd. | Vibration actuator module |
| US8466604B2 (en) * | 2009-11-27 | 2013-06-18 | Samsung Electro-Mechanics Co., Ltd. | Vibration actuator module having smaller elastic modulus than vibrated body |
| US20140367191A1 (en) * | 2012-09-26 | 2014-12-18 | Kyocera Corporation | Acoustic generator, acoustic generation device, and electronic device |
| US9070355B2 (en) * | 2012-09-26 | 2015-06-30 | Kyocera Corporation | Acoustic generator, acoustic generation device, and electronic device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US3721840A (en) | Sound generator | |
| US2403692A (en) | Piezoelectric device | |
| US3941946A (en) | Electrostatic transducer assembly | |
| US3833825A (en) | Wide-band electroacoustic transducer | |
| US3832580A (en) | High molecular weight, thin film piezoelectric transducers | |
| US3908098A (en) | Electrostatic transducer | |
| JP3123431B2 (en) | Piezo speaker | |
| CA1294359C (en) | Flexural disk resonant cavity transducer | |
| US3761956A (en) | Sound generating device | |
| KR19990044031A (en) | Inertial Vibration Transducer | |
| US4246448A (en) | Electromechanical transducer | |
| JPS61157100A (en) | Speaker | |
| US3849679A (en) | Electroacoustic transducer with controlled beam pattern | |
| US3222462A (en) | Electroacoustic transducer | |
| JPS5911237B2 (en) | piezoelectric speaker | |
| US3025359A (en) | Vibration-compensated pressure sensitive microphone | |
| US3118979A (en) | Electrostatic transducer | |
| US2967956A (en) | Transducer | |
| US4764968A (en) | Disk diaphragm for a loudspeaker | |
| US3728562A (en) | Electroacoustic transducer having transducing element supporting means | |
| US2477596A (en) | Electromechanical transducer device | |
| US3707131A (en) | Electroacoustic transducers of the bilaminar flexural vibrating type | |
| JPH0113279B2 (en) | ||
| US5018116A (en) | Inter-element mounting for stacked piezoelectric transducers | |
| US4845776A (en) | Piezoelectric transducer and transformer circuit |