CA1180100A - Ultrasonic transmitter-receiver - Google Patents
Ultrasonic transmitter-receiverInfo
- Publication number
- CA1180100A CA1180100A CA000391822A CA391822A CA1180100A CA 1180100 A CA1180100 A CA 1180100A CA 000391822 A CA000391822 A CA 000391822A CA 391822 A CA391822 A CA 391822A CA 1180100 A CA1180100 A CA 1180100A
- Authority
- CA
- Canada
- Prior art keywords
- diaphragm
- receiver
- ultrasonic transmitter
- electric element
- housing
- 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
- 230000002745 absorbent Effects 0.000 claims description 6
- 239000002250 absorbent Substances 0.000 claims description 6
- 230000002093 peripheral effect Effects 0.000 claims description 4
- 230000010358 mechanical oscillation Effects 0.000 abstract description 3
- 210000000188 diaphragm Anatomy 0.000 description 25
- 230000005540 biological transmission Effects 0.000 description 12
- 230000035945 sensitivity Effects 0.000 description 10
- 229910052729 chemical element Inorganic materials 0.000 description 3
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 239000000919 ceramic Substances 0.000 description 2
- 229910010293 ceramic material Inorganic materials 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000010355 oscillation Effects 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 241000220317 Rosa Species 0.000 description 1
- 230000001154 acute effect Effects 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000002594 sorbent Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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
- G10K9/00—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers
- G10K9/12—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers electrically operated
- G10K9/122—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers electrically operated using piezoelectric driving means
-
- 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
-
- 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
- H04R17/10—Resonant transducers, i.e. adapted to produce maximum output at a predetermined frequency
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Multimedia (AREA)
- Transducers For Ultrasonic Waves (AREA)
- Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
An ultrasonic transmitter-receiver is characterized in that a diaphragm is disposed at the center of a laminated piezoelectric element and the periphery of the diaphragm is flexibly fixed in a housing through a buffer member of elastic rubber or the like in order to suppress mechanical oscillation.
An ultrasonic transmitter-receiver is characterized in that a diaphragm is disposed at the center of a laminated piezoelectric element and the periphery of the diaphragm is flexibly fixed in a housing through a buffer member of elastic rubber or the like in order to suppress mechanical oscillation.
Description
~L8~10~
ULTRASONIC TRANSMITTER-RECEIVER
BACKGROUND OF THE INVENTION
1. Field of the Invention This invention relates to an ultrasonic transmitter-receiver using a laminated piezo electric element, and more particularly to an ultrasonic transmitter-receiver with improved sensitivity characteristics and improved pulse characteristics (transition characteristics).
ULTRASONIC TRANSMITTER-RECEIVER
BACKGROUND OF THE INVENTION
1. Field of the Invention This invention relates to an ultrasonic transmitter-receiver using a laminated piezo electric element, and more particularly to an ultrasonic transmitter-receiver with improved sensitivity characteristics and improved pulse characteristics (transition characteristics).
2. Description of the Prior Art Conventional ultrasonic transmitter-receivers usually include laminated piezo-electric ceramic elements and the laminated elements are designed to work at resonance or anti-resonance points of oscillation. Further, because of the mechanical impedance of the air being substan-tially smaller than that o~ the piezo-electric ceramic element, the laminated element is bonded to a diaphragm in an attempt to reduce mechanical impedance.
In the case where lt is necessary to provide readouts within a short period of time through the use of the conven-tional ultrasonic transmitter-receiver, a particular signal is sometimes received before the precRding signal is received by the receiver because of the longer rise and fall times of the latter, thus making measurements inaccurate.
Furthermore, in the case where transmission and reception of ultrasonic radiations are performed with a single unit ele-ment, it takes a substantial amount of time to make the ele-ment ready to receive the signals after transmission of the signals. Of course, readouts are not available until the ele--ment is made ready to receive -the signals.
.~
., j.
The present invention is intended to provide a resolution to the above discussed problems.
SUMMARY OF THE INVENTION
It is a primary object of the present invention to provide an ultra-sonic transmitter-receiver where the rise time and fall time of pulses are shorter.
It is another object of the present invention to provide an ultra-sonic transmitter-receiver which exhibits excellent transmission sensitivity.
It is still another object of the present invention to provide an ultrasonic transmitter-receiver which exhibits excellent directivity.
Because of the present invention, the above discussed problems are overcome by providing an ultrasonic transmitter-receiver wherein a diaphragm is disposed at the center of a laminated piezo-electric element and the periphery of the diaphragm for s~ppressing mechanical oscillation is flexibly secured on a housing by way of a buffer member made of elastic rubber or the like.
Thus, in accordance with a broad aspect of the invention, there is provided an ultrasonic transmitter-receiver comprising: a laminated piezo-electric element, a diaphragm at a central portion of said laminated piezo-electric element, a housing means for accommodating said laminated piezo-electric element therein, an elastic buffer member disposed ln bridging contact between a peripheral portion of said diaphragm and an inner side wall of said housing, wherein said diaphragm is flexibly fixed and held with-in said housing through the use of said elastic buffer member, and an acous-tic absorbent disposed on an inner bottom wall of said housing but spaced out of contact from said laminated piezo-electric element~ whereby there is an improvement in pulse characteristics, such as rise time.
BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 is a cross sectional view of a typical conventional ultra-sonic transmitter-receiver;
Figure 2 is a graph sho~ing the pulse characteristics of the above illustrated transmitter-receiver;
Figure 3 is a cross sectional view illustrating an ultrasonic transmitter-receiver constructed according to an embodiment of the present invention;
- 2a -~81~
- Fig. 4 is a graph showing the pulse characteristics of the above illustrated embodiment;
Fig. 5 is a graph showing the relationship between rise time and the inner diameter of a buffer member and the rela-tionship between directivity (acoustic pressure half-angle) and the inner diameter of the buffer member;
Fig. 6 is a graph showing the relationship between the diameter of a diaphragm and the relative transmission sensi-tivity of the illustrated embodiment;
Fig. 7 is a graph showing the relationship between the dia-meter of the diaphragm and directivity (acoustic pressure half-angle);
Fig. 8 is a graph showing the relationship between the angle of the top of the diaphragm and directivity;
Fig. 9 is a schematic view of an ultrasonic transmitter-receiver according to another embodiment of the present inven-tion;
Fig. 10 is a view showing the pulse characteristics of the ultrasonic transmitter-receiver as shown in Fig. 9;
Fig. 11 is a view showing the effect of an acoustical ab-sorbent;
Fig. 12 is a graph showing the relationship between the inner diameter of the buffer-member and the pulse characteris-tics of the alternative embodiment;
Fig. 13 is a graph showing the frequency dependency on transmission s~nsitivity; and Fig. 14 is a graph showing the temperature dependency on pulse characteristics and transmission sensitivity.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
Structure and operating properties of~the conventional ultrasonic transmitter-receiver are illustrated in Figs. 1 and 2.
As indicated in Fig. 1, an end of a coupling shaft 2 is fixed to pass through a central portion of a laminated piezo-electric element 1 with the remaining end thereof being secured fixedly on a diaphragm 3. Nodes of oscillation of the lamina-ted piezo-electric element 1 are mounted vla a flexible adhesive 5 on tips of supports 4. There is further provided terminals 6 and 6', a housing 7 for protecting the laminated piezo-electric element 1 and so forth against the outside atmosphere, a protective mesh 8 disposed at a tcp portion of the housing 7 and lead wires 9 and 9' for connecting electrically the lam-inated piezo-electric element 1 to the terminals 6 and 6'.
Fig. 2 depicts the waveform of radiations transmitted when the ultrasonic transmitter-receiver of the above mentioned structure operates over a plurality of pulses, wherein rise time and fall time are relatively long, i.e. on the order of 2 milliseconds.
Specific embodiments of the present invention will now be described by reference to the drawings.
Fig. 3 is a cross sectional view of an ultrasonic trans-mitter-receiver according to the present invention. A dia-phragm 13 typically of metal or plastic is fixed around a coup-ling shaft 12 which is disposed at a central portion of a lam-inated piezo-electric element 11 made of a proper piezo-electric ceramic material. The diaphragm 13 is of a conical configuration and the laminated piezo-electric element 11 is a disc configuration. A peripheral portion of the diaphragm 13 is flexibly secured in an inner side wall of a cylindrical housing 17 through the use of an annular buffer member 20 of elastic rubber or the like in order to suppress mechanical os-cillation. Further, the diaphragm 13 and the laminated piezo-electric element 11 are disposed at the center of the housing 17 through the buffer member 20. ~ pair of terminals 16 and 16l are connected electrically to the laminated piezo-elec-tric element 11 via lead wires 19 and 19'.
Fig. 4 depicts the pulse characteristics of the ultra-sonic transmitter-receiver of the above described structure, indicating that the rise time and fall time of a pulse were less than 0.2 millisecond.
Fig. 5 indicates the rise time and directivity (acoustic pressure half-angle3 as a function of the inner diameter of the annular buffer member 20. In the illustrated embodiment, the diameter of the diaphragm 13 was 16 mm.
Fig. 6 is a graph showing the relationship between the diameter of the diaphragm 13 provided for the disc-like lam-inated piezo-electric element (diameter: lOmm) and transmission sensitivity, indicating that the greater the diameter of the diaphragm 13 the greater transmission sensitivity.
Fig. 7 is a graph showing the relationship between the diameter of the diaphragm 13 and directivity (acoustic pressure half-angle). It is clear from Fig. 7 that the ultrasonic trans-mitter-receiver manifests acute directivity when the diameter of a diaphragm becomes greater.
In addition, Fig. 8 shows the relationship between the -angle of the top of the conical diaphragm 13 and directivity.
.
.
~8~
The sharpest directivity was viewed when the conical diaphragm with 0.3-0.5 of height(h)-to bottom diameter (R) ratio was used.
Fig. 9 is a cross sectional view of an ultrasonic trans-mitter-receiver according to another embodiment of the present invention. In Fig. 9, a diaphragm 21 typically of metal or plastic is fixed around a coupling shaft 23 which is disposed at a central portion o a laminated piezo-electric element 22 made of a piezo-electric ceramic material. A peripheral portion of the diaphragm 21 fixedly secured in an inner side wall of a cylindrical housing 25 through the use of an annular buffer mem-ber 24 of elastic rubber or the like to suppress mechanical oscillation. In addition, an acoustic absorbent 26 is disposed on an inner bottom wall of the housing 25. A pair of terminals 27 and 27' are connected electrically to the laminated piezo-electric element 22 via lead wires 28 and 28'.
The distinction of the ultrasonic transmitter-receiver as shown in Fig. 9 from that of Fig. 3 is the provision of the acoustic absorbent 26 on the bottom of the housing 25. The pro-vision of the acoustic absorbent 26 assures further improvement in the pulse characteristics.
The pulse characteristics of the ultrasonic transmitter-receiver of the above detailed structure are depicted in Fig.
10, which indicates that the rise time and fall time of a pulse were shorter than 0.1 ms. It is noted that Fig. 10 was plotted with pulse envelop lines although there were in fact three to four waves before the pulse rose completely.
Fig. 11 shows the effect of the above described acous~ic absorbent 26 on the pulse characteristics, indicating a remarkable improvement in the rise time.
Fig. 12 represents the relationship between the inner dia-meter of the annular buffer member 24 and the rise time and fall time. The diaphragm 21 has a diameter of 16 mm and the laminated piezo-electric element 22 has a diameter of 10 mm and a thickness of 0.5 mm.
In Fig. 13, there is illustrated the frequency dependency of the transmission sensitivity of the ultrasonic transmitter-receiver designed with the above exemplified dimensions accor-ding to the present invention.
Fig. 14 depicts the temperature dependency on the pulse characteristics and transmission sensitivity. As compared with those at 20C, the rise time showed no substantial variation at -20C and increased by 12~ at 60C while the transmission sen-sitivity declined by 5% at -20C. It is understood that the pulse characteristics showed no variation even when the pro-tective mesh was disposed at the front of the housing 17.
As noted earlier, the present invention provides the ultra-sonic transmitter-receiver which shows improved pulse charac-teristics and improved transmission sensitivity as well as the shortened pulse rise time and fall time. Furthermore, the ultrasonic transmitter-receiver embodying the present invention becomes stronger and simpler in structure with its lower pro-file and easier to assemble than the conventional device, by flexibly fixing and holding the diaphragm within the housing.
The ultrasonic transmitter-receiver of the present invention is therefore very useful for measurements which demand readouts within a short period of time.
In the case where lt is necessary to provide readouts within a short period of time through the use of the conven-tional ultrasonic transmitter-receiver, a particular signal is sometimes received before the precRding signal is received by the receiver because of the longer rise and fall times of the latter, thus making measurements inaccurate.
Furthermore, in the case where transmission and reception of ultrasonic radiations are performed with a single unit ele-ment, it takes a substantial amount of time to make the ele-ment ready to receive the signals after transmission of the signals. Of course, readouts are not available until the ele--ment is made ready to receive -the signals.
.~
., j.
The present invention is intended to provide a resolution to the above discussed problems.
SUMMARY OF THE INVENTION
It is a primary object of the present invention to provide an ultra-sonic transmitter-receiver where the rise time and fall time of pulses are shorter.
It is another object of the present invention to provide an ultra-sonic transmitter-receiver which exhibits excellent transmission sensitivity.
It is still another object of the present invention to provide an ultrasonic transmitter-receiver which exhibits excellent directivity.
Because of the present invention, the above discussed problems are overcome by providing an ultrasonic transmitter-receiver wherein a diaphragm is disposed at the center of a laminated piezo-electric element and the periphery of the diaphragm for s~ppressing mechanical oscillation is flexibly secured on a housing by way of a buffer member made of elastic rubber or the like.
Thus, in accordance with a broad aspect of the invention, there is provided an ultrasonic transmitter-receiver comprising: a laminated piezo-electric element, a diaphragm at a central portion of said laminated piezo-electric element, a housing means for accommodating said laminated piezo-electric element therein, an elastic buffer member disposed ln bridging contact between a peripheral portion of said diaphragm and an inner side wall of said housing, wherein said diaphragm is flexibly fixed and held with-in said housing through the use of said elastic buffer member, and an acous-tic absorbent disposed on an inner bottom wall of said housing but spaced out of contact from said laminated piezo-electric element~ whereby there is an improvement in pulse characteristics, such as rise time.
BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 is a cross sectional view of a typical conventional ultra-sonic transmitter-receiver;
Figure 2 is a graph sho~ing the pulse characteristics of the above illustrated transmitter-receiver;
Figure 3 is a cross sectional view illustrating an ultrasonic transmitter-receiver constructed according to an embodiment of the present invention;
- 2a -~81~
- Fig. 4 is a graph showing the pulse characteristics of the above illustrated embodiment;
Fig. 5 is a graph showing the relationship between rise time and the inner diameter of a buffer member and the rela-tionship between directivity (acoustic pressure half-angle) and the inner diameter of the buffer member;
Fig. 6 is a graph showing the relationship between the diameter of a diaphragm and the relative transmission sensi-tivity of the illustrated embodiment;
Fig. 7 is a graph showing the relationship between the dia-meter of the diaphragm and directivity (acoustic pressure half-angle);
Fig. 8 is a graph showing the relationship between the angle of the top of the diaphragm and directivity;
Fig. 9 is a schematic view of an ultrasonic transmitter-receiver according to another embodiment of the present inven-tion;
Fig. 10 is a view showing the pulse characteristics of the ultrasonic transmitter-receiver as shown in Fig. 9;
Fig. 11 is a view showing the effect of an acoustical ab-sorbent;
Fig. 12 is a graph showing the relationship between the inner diameter of the buffer-member and the pulse characteris-tics of the alternative embodiment;
Fig. 13 is a graph showing the frequency dependency on transmission s~nsitivity; and Fig. 14 is a graph showing the temperature dependency on pulse characteristics and transmission sensitivity.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
Structure and operating properties of~the conventional ultrasonic transmitter-receiver are illustrated in Figs. 1 and 2.
As indicated in Fig. 1, an end of a coupling shaft 2 is fixed to pass through a central portion of a laminated piezo-electric element 1 with the remaining end thereof being secured fixedly on a diaphragm 3. Nodes of oscillation of the lamina-ted piezo-electric element 1 are mounted vla a flexible adhesive 5 on tips of supports 4. There is further provided terminals 6 and 6', a housing 7 for protecting the laminated piezo-electric element 1 and so forth against the outside atmosphere, a protective mesh 8 disposed at a tcp portion of the housing 7 and lead wires 9 and 9' for connecting electrically the lam-inated piezo-electric element 1 to the terminals 6 and 6'.
Fig. 2 depicts the waveform of radiations transmitted when the ultrasonic transmitter-receiver of the above mentioned structure operates over a plurality of pulses, wherein rise time and fall time are relatively long, i.e. on the order of 2 milliseconds.
Specific embodiments of the present invention will now be described by reference to the drawings.
Fig. 3 is a cross sectional view of an ultrasonic trans-mitter-receiver according to the present invention. A dia-phragm 13 typically of metal or plastic is fixed around a coup-ling shaft 12 which is disposed at a central portion of a lam-inated piezo-electric element 11 made of a proper piezo-electric ceramic material. The diaphragm 13 is of a conical configuration and the laminated piezo-electric element 11 is a disc configuration. A peripheral portion of the diaphragm 13 is flexibly secured in an inner side wall of a cylindrical housing 17 through the use of an annular buffer member 20 of elastic rubber or the like in order to suppress mechanical os-cillation. Further, the diaphragm 13 and the laminated piezo-electric element 11 are disposed at the center of the housing 17 through the buffer member 20. ~ pair of terminals 16 and 16l are connected electrically to the laminated piezo-elec-tric element 11 via lead wires 19 and 19'.
Fig. 4 depicts the pulse characteristics of the ultra-sonic transmitter-receiver of the above described structure, indicating that the rise time and fall time of a pulse were less than 0.2 millisecond.
Fig. 5 indicates the rise time and directivity (acoustic pressure half-angle3 as a function of the inner diameter of the annular buffer member 20. In the illustrated embodiment, the diameter of the diaphragm 13 was 16 mm.
Fig. 6 is a graph showing the relationship between the diameter of the diaphragm 13 provided for the disc-like lam-inated piezo-electric element (diameter: lOmm) and transmission sensitivity, indicating that the greater the diameter of the diaphragm 13 the greater transmission sensitivity.
Fig. 7 is a graph showing the relationship between the diameter of the diaphragm 13 and directivity (acoustic pressure half-angle). It is clear from Fig. 7 that the ultrasonic trans-mitter-receiver manifests acute directivity when the diameter of a diaphragm becomes greater.
In addition, Fig. 8 shows the relationship between the -angle of the top of the conical diaphragm 13 and directivity.
.
.
~8~
The sharpest directivity was viewed when the conical diaphragm with 0.3-0.5 of height(h)-to bottom diameter (R) ratio was used.
Fig. 9 is a cross sectional view of an ultrasonic trans-mitter-receiver according to another embodiment of the present invention. In Fig. 9, a diaphragm 21 typically of metal or plastic is fixed around a coupling shaft 23 which is disposed at a central portion o a laminated piezo-electric element 22 made of a piezo-electric ceramic material. A peripheral portion of the diaphragm 21 fixedly secured in an inner side wall of a cylindrical housing 25 through the use of an annular buffer mem-ber 24 of elastic rubber or the like to suppress mechanical oscillation. In addition, an acoustic absorbent 26 is disposed on an inner bottom wall of the housing 25. A pair of terminals 27 and 27' are connected electrically to the laminated piezo-electric element 22 via lead wires 28 and 28'.
The distinction of the ultrasonic transmitter-receiver as shown in Fig. 9 from that of Fig. 3 is the provision of the acoustic absorbent 26 on the bottom of the housing 25. The pro-vision of the acoustic absorbent 26 assures further improvement in the pulse characteristics.
The pulse characteristics of the ultrasonic transmitter-receiver of the above detailed structure are depicted in Fig.
10, which indicates that the rise time and fall time of a pulse were shorter than 0.1 ms. It is noted that Fig. 10 was plotted with pulse envelop lines although there were in fact three to four waves before the pulse rose completely.
Fig. 11 shows the effect of the above described acous~ic absorbent 26 on the pulse characteristics, indicating a remarkable improvement in the rise time.
Fig. 12 represents the relationship between the inner dia-meter of the annular buffer member 24 and the rise time and fall time. The diaphragm 21 has a diameter of 16 mm and the laminated piezo-electric element 22 has a diameter of 10 mm and a thickness of 0.5 mm.
In Fig. 13, there is illustrated the frequency dependency of the transmission sensitivity of the ultrasonic transmitter-receiver designed with the above exemplified dimensions accor-ding to the present invention.
Fig. 14 depicts the temperature dependency on the pulse characteristics and transmission sensitivity. As compared with those at 20C, the rise time showed no substantial variation at -20C and increased by 12~ at 60C while the transmission sen-sitivity declined by 5% at -20C. It is understood that the pulse characteristics showed no variation even when the pro-tective mesh was disposed at the front of the housing 17.
As noted earlier, the present invention provides the ultra-sonic transmitter-receiver which shows improved pulse charac-teristics and improved transmission sensitivity as well as the shortened pulse rise time and fall time. Furthermore, the ultrasonic transmitter-receiver embodying the present invention becomes stronger and simpler in structure with its lower pro-file and easier to assemble than the conventional device, by flexibly fixing and holding the diaphragm within the housing.
The ultrasonic transmitter-receiver of the present invention is therefore very useful for measurements which demand readouts within a short period of time.
Claims (3)
1. An ultrasonic transmitter-receiver comprising:
a laminated piezo-electric element, a diaphragm at a central portion of said laminated piezo-electric element, a housing means for accommodating said laminated piezo-electric element therein, an elastic buffer member disposed in bridging contact between a peripheral portion of said diaphragm and an inner side wall of said housing, wherein said diaphragm is flexibly fixed and held within said housing through the use of said elastic buffer member, and an acoustic absorbent disposed on an inner bottom wall of said housing but spaced out of contact from said laminated piezo-electric element, whereby there is an improvement in pulse characteristics, such as rise time.
a laminated piezo-electric element, a diaphragm at a central portion of said laminated piezo-electric element, a housing means for accommodating said laminated piezo-electric element therein, an elastic buffer member disposed in bridging contact between a peripheral portion of said diaphragm and an inner side wall of said housing, wherein said diaphragm is flexibly fixed and held within said housing through the use of said elastic buffer member, and an acoustic absorbent disposed on an inner bottom wall of said housing but spaced out of contact from said laminated piezo-electric element, whereby there is an improvement in pulse characteristics, such as rise time.
2. An ultrasonic transmitter-receiver as defined in Claim 1 wherein said diaphragm is of a conical configuration and said laminated piezo-electric element is of a disc configuration.
3. An ultrasonic transmitter-receiver as defined in Claim 2 wherein said conical diaphragm has a ratio of height to bottom diameter within 0.3 through 0.5.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP55-174328/1980 | 1980-12-10 | ||
| JP17432880A JPS6025956B2 (en) | 1980-12-10 | 1980-12-10 | Ultrasonic transducer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1180100A true CA1180100A (en) | 1984-12-27 |
Family
ID=15976713
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000391822A Expired CA1180100A (en) | 1980-12-10 | 1981-12-09 | Ultrasonic transmitter-receiver |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP0053947B1 (en) |
| JP (1) | JPS6025956B2 (en) |
| CA (1) | CA1180100A (en) |
| DE (1) | DE3172788D1 (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5851697A (en) * | 1981-09-22 | 1983-03-26 | Matsushita Electric Ind Co Ltd | Ultrasonic wave transceiver |
| US4607186A (en) * | 1981-11-17 | 1986-08-19 | Matsushita Electric Industrial Co. Ltd. | Ultrasonic transducer with a piezoelectric element |
| DE8712014U1 (en) * | 1987-09-04 | 1987-10-29 | Chen, Ding Pang, Taipeh/T'ai-pei | Perimeter element for a loudspeaker |
| GB2215049B (en) * | 1988-02-02 | 1991-08-21 | Stc Plc | Acoustic devices |
| IT1262971B (en) * | 1992-08-05 | 1996-07-23 | Imapo Srl | PIEZOMEMBRANA BOUND AT THE CENTER AND ITS USE FOR THE REALIZATION OF Acoustic Horn. |
| KR100514761B1 (en) * | 1997-02-03 | 2005-09-15 | 스와겔로크 컴패니 | Diaphragm valve |
| DE10239191A1 (en) | 2002-08-21 | 2004-03-11 | Heesemann, Jürgen, Dipl.-Ing. | Grinding machine and method for grinding a workpiece |
| DE102016117879B4 (en) * | 2016-09-22 | 2019-06-13 | Valeo Schalter Und Sensoren Gmbh | Sensor system, motor vehicle and method for cleaning an ultrasonic sensor |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1301808A (en) * | 1960-09-06 | 1962-08-24 | Vega | Advanced loudspeaker for high frequencies |
| US3360664A (en) * | 1964-10-30 | 1967-12-26 | Gen Dynamics Corp | Electromechanical apparatus |
| GB1316811A (en) * | 1969-05-22 | 1973-05-16 | Matsushita Electric Ind Co Ltd | Microphone |
| US3786202A (en) * | 1972-04-10 | 1974-01-15 | Motorola Inc | Acoustic transducer including piezoelectric driving element |
| US4011473A (en) * | 1974-08-26 | 1977-03-08 | Fred M. Dellorfano, Jr. & Donald P. Massa, Trustees Of The Stoneleigh Trust | Ultrasonic transducer with improved transient response and method for utilizing transducer to increase accuracy of measurement of an ultrasonic flow meter |
| 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 |
| US4190783A (en) * | 1978-07-25 | 1980-02-26 | The Stoneleigh Trust, Fred M. Dellorfano, Jr. & Donald P. Massa, Trustees | Electroacoustic transducers of the bi-laminar flexural vibrating type with an acoustic delay line |
-
1980
- 1980-12-10 JP JP17432880A patent/JPS6025956B2/en not_active Expired
-
1981
- 1981-12-09 CA CA000391822A patent/CA1180100A/en not_active Expired
- 1981-12-10 DE DE8181305827T patent/DE3172788D1/en not_active Expired
- 1981-12-10 EP EP81305827A patent/EP0053947B1/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| EP0053947A1 (en) | 1982-06-16 |
| EP0053947B1 (en) | 1985-10-30 |
| DE3172788D1 (en) | 1985-12-05 |
| JPS6025956B2 (en) | 1985-06-21 |
| JPS5797798A (en) | 1982-06-17 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |