US3835254A - Ultrasonic transmitting and receiving device - Google Patents

Ultrasonic transmitting and receiving device Download PDF

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Publication number
US3835254A
US3835254A US00246537A US24653772A US3835254A US 3835254 A US3835254 A US 3835254A US 00246537 A US00246537 A US 00246537A US 24653772 A US24653772 A US 24653772A US 3835254 A US3835254 A US 3835254A
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US
United States
Prior art keywords
opening
chambers
ultrasonic
pair
outer case
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
Application number
US00246537A
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English (en)
Inventor
H Ohasi
S Okamoto
M Okamoto
H Kyoto
H Mori
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Electric Works Co Ltd
Original Assignee
Matsushita Electric Works Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Matsushita Electric Works Ltd filed Critical Matsushita Electric Works Ltd
Application granted granted Critical
Publication of US3835254A publication Critical patent/US3835254A/en
Anticipated expiration legal-status Critical
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    • 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
    • G10K11/28—Sound-focusing or directing, e.g. scanning using reflection, e.g. parabolic reflectors
    • 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
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S367/00—Communications, electrical: acoustic wave systems and devices
    • Y10S367/91—Portable sonar devices

Definitions

  • ultrasonic oscillators to be used for transmitting and receiving ultrasonic waves are exposed to dust, rain water, snow or the like, unless they are of a special structure, their oscillation will be remarkably impeded and ultrasonic output or output voltage as of a microphone will reduce.
  • the oscillator is fitted horizontally and a horn for focusing sound waves is fitted to it, rain water, dust or the like will enter the horn through the upper part and will be deposited onto the oscillator and, therefore, its oscillation will be remarkably impeded.
  • the oscillator is fitted vertically and a horn for focusing sound waves is fitted to the oscillator so as to be directed with its opening downward so that rain water, dust or the like will not enter the horn, and a reflector to reflect ultrasonic waves is provided diagonally in the opening of the horn so that ultrasonic waves will be projected horizontally while the oscillator is positioned vertically and thus the above mentioned defect will be solved.
  • a principal object of the present invention is, therefore, to provide an ultrasonic transmitting and receiving device wherein rain water, dust or the like will not be deposited to the oscillators.
  • Another object of the present invention is to provide an ultrasonic transmitting and receiving device wherein the projecting direction of ultrasonic waves from the transmitter can be changed in a simple manner.
  • FIG. 1 shows a conventional device
  • FIGS. 2 to 4 show a device embodying the present invention, wherein FIG. 2 is a sectioned view;
  • FIG. 3 is a sectioned view on line X X in FIG. 2;
  • FIG. 4 is a perspective view of the device as disassembled.
  • FIG. 1 showing a conventional ultrasonic transmitting and receiving device
  • a is an oscillator
  • b is a horn which is disposed horizontally.
  • rain water c will readily reach the oscillator a so as to cause the operation of the oscillator impeded.
  • FIGS. 2 to 4 An embodiment of the present invention shall be explained in the following with reference to FIGS. 2 to 4, in which 1 is a flat shaped mounting base having two sets of fitting holes 2 and 3.
  • 4 and 4' are resilient L- shaped holding metal pieces each of which comprising a mounting leaf 35 provided with holes 7 for fitting the holding metal member to the mounting base 1 and a rectangular bent part 35' provided with a hole 5 for pivoting a holding frame, screw holes 6 for fitting a cover thereto and a bent tab 28 projected inward.
  • the holding metal pieces 4 and 4' are fixed respectively to the upper part and lower part of the mounting base 1 by screwing screws into the holding metal piece fitting holes 3 in the base 1 through the holes 7 in the metal members 4 and 4'.
  • a holding frame provided on its front surface with a pair of openings 9 and 9 and at the upper and lower ends with vertical stubs 10 for engaging with the holding metal pieces.
  • Rear side of the frame 8 is opened at rear opening 11 which is covered by a lid 13 which is fitted on the inside surface with a felt or any other sound absorbing material 12.
  • 14 is a plurality of shielding plates provided integrally to project parallelly with each other on the front surface between the front openings 9 and 9' of the holding frame 8.
  • a transmitter which is provided with a reflector 19 disposed as inclined by about 45 with respect to the central axis of a horn 18 in a downward opening 17 of the horn 18 gradually expanded in the caliber toward the opening 17 from its throat 16, and contains in the throat 16 of the horn 18 a transmitting transducer 20 for converting an electric power to ultrasonic waves.
  • This transmitting transducer 20 is made, for example, by properly fitting a piezoelectric element with a pair of electrodes.
  • the piezoelectric element When a high frequency voltage is impressed between the respective electrodes, the piezoelectric element will oscillate due to a piezoelectric phenomenon to generate ultrasonic waves which will propagate from the throat 16 to the opening 17 of the horn so as to be reflected by the reflector 19 and projected in a direction substantially at right angles with respect to the central axis of the horn 18.
  • the transmitting transducer 20 When the natural frequency of the elastic oscillation of the piezoelectric element coincides substantially with the frequency of the high frequency voltage impressed between the electrodes, the transmitting transducer 20 will generate ultrasonic waves efficiently.
  • the 21 is a receiver which is provided with a diagonal reflecter 25 in the opening 23 of a horn 24 gradually expanded in the caliber toward its opening 23 from its throat 22 and contains in the throat 22 of the horn 24 a receiving transducer converting received ultrasonic waves to an electric power.
  • This receiving transducer 26 is made, for example, the same as the transmitting transducer 20, by properly fitting a piezoelectric element with a pair of electrodes. When the piezoelectric element is oscillated by ultrasonic waves, a voltage will be generated between the respective electrodes by the piezoelectric phenomenon.
  • the transmitter 15 and receiver 21 are contained respectively in the lower and upper parts of the holding frame 8 so as to form a transmitting and receiving device 27.
  • the transmitter 15 is contained in the holding frame 8 so that ultrasonic waves projected in the direction substantially at right angles with respect to the central axis of the horn 18 will be reflected by the reflector l9 and radiated through the opening 9 of the holding frame 8, and the receiver 21 is contained in the holding frame 8 so that ultrasonic waves reflected from an object to be detected and propagated into the holding frame 8 through the opening 9' will be reflected by the reflector 25 and further propagated to the throat 22 through the opening 25.
  • the ultrasonic waves transmitted through the opening 9 of the holding frame 8 will not propagate directly to the opening 9' of the receiving side as interrupted by the shielding plates 14.
  • the transmitting and receiving device 27 is mounted on the mounting base 1 so as to be rotatable about the engaging stubs 10 and 10 as a center by engaging the engaging stubs l0 and 10 at the upper and lower ends of the holding frame 8 with the engaging holes 5 of the holding metal pieces 4 and 4' secured to the mounting base 1.
  • the inward bent tabs 28 formed integrally with the holding metal pieces 4 and 4' will contact the upper and lower end surfaces of the holding frame 8 so as to prevent the transmitting and receiving device 27 from rotating by itself.
  • a cover 29 is a cover in which a metal screen 32 is fitted arcuately to each opening 30 of a cover frame 31 having the openings 30 which are opposing to the openings 9 and 9 of the holding frame 8 of the transmitting and receiving device 27, a decorative plate 33 is fitted to the outside surface of the cover frame 31 and the peripheral edge of the metal screen 32 is inserted and held between the periheral edge of the opening 30 and the decorative plate 33.
  • the cover 29 is secured to the mounting base 1 so as to enclose the transmitting and receiving device 27 by screwing screws passed through holes 34 formed on the upper and lower end surfaces of the cover frame 31 into the screw holes 6 in the holding metal pieces 4 and 4'.
  • the present invention is formed as mentioned above, when a high frequency voltage is impressed on the transmitting transducer 20, ultrasonic waves will be radiated through the opening 9 of the holding frame 8. The waves will be reflected by an object to be detected if exists and will be propagated into the holding frame 8 through the opening 9' of the holding frame. Thus returned waves will be reflected at the reflector 25 to be directed to the throat 22 through the opening 23 of the horn 24 to reach the receiving transducer 26 and thereby the waves will be converted to an electric power.
  • a transmitting transducer for converting ultrasonic waves to an electric power is contained and disposed in the throat 16 of a horn 18 which is gradually expanded in the caliber toward its opening 17 from its throat l6 and a reflector 19 is disposed as inclined by about 45 to the central axis of the horn 18 in the opening 17 of the horn 18 to form a transmitter 15, so that ultrasonic waves generated by the transmitting transducer 20 will be reflected by the reflector 19 and transmitted in a direction at right angles with respect to the central axis of the horn l8 and, at the same time, a reflector is disposed as inclined by about with respect to the central axis of the horn 24 in the opening 23 of the horn 24 which is gradually expanded in the caliber toward its opening 23 from its throat 22 and a receiving transducer 26 converting ultrasonic waves to an electric power is contained and disposed in the throat 22 of the horn 24 to form a receiver 21, so that ultrasonic waves propagating to the receiver 21 at right angles
  • the transmitting direction of ultrasonic waves of the transmitter 15 can be changed very simply and that, when the ultrasonic waves transmitted out of the transmitter 15 are reflected by the object to be detected and are propagated to the receiver 21, the ultrasonic waves will propagate at right angles with the opening plane of the opening 9 of the holding frame 8 and to the throat 22 of the receiver efficiently.
  • An ultrasonic transmitting and receiving device comprising the combination of a semi-cylindrical outer case having at least one opening in the front wall thereof, said opening extending around a major portion of the semicylindrical outer case so as to form an opening of substantially a semi-cylindrical screen mounted over said opening,
  • At least one shielding plate disposed on the front of said inner case between said openings of said pair of chambers and extending horizontally to block direct transmission of ultrasonic waves between said pair of chambers
  • An ultrasonic transmitting and receiving device comprising the combination of a semi-cylindrical outer case having at least one opening in the front wall thereof,
  • an ultrasonic transmitter located in one of said cham- 5 bers and means for directing ultrasonic waves gen- Calvererated by said transmitter through the front openchambers and means for directing ultrasonic waves from the front opening in said chamber to said re-

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
  • Transducers For Ultrasonic Waves (AREA)
US00246537A 1971-05-31 1972-04-24 Ultrasonic transmitting and receiving device Expired - Lifetime US3835254A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1971045494U JPS485606U (ja) 1971-05-31 1971-05-31

Publications (1)

Publication Number Publication Date
US3835254A true US3835254A (en) 1974-09-10

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ID=12720939

Family Applications (1)

Application Number Title Priority Date Filing Date
US00246537A Expired - Lifetime US3835254A (en) 1971-05-31 1972-04-24 Ultrasonic transmitting and receiving device

Country Status (4)

Country Link
US (1) US3835254A (ja)
JP (1) JPS485606U (ja)
DE (2) DE2226306C3 (ja)
GB (1) GB1378248A (ja)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4192977A (en) * 1976-12-20 1980-03-11 Akg Akustische U. Kino-Gerate Gesellschaft M.B.H. Highly directional ultrasonic electret transducer
US4288867A (en) * 1978-11-14 1981-09-08 Alarm Device Manufacturing Company Area intrusion adjustable detector unit
US4811307A (en) * 1985-05-10 1989-03-07 L'etat Francais Represente Par Le Delegue General Pour L'armement Tonpilz type piezoelectric transducer capable of operating alternately as wideband receiver and emitter
US6628568B1 (en) 2002-03-19 2003-09-30 Bha Group Holdings, Inc. System and method for verification of acoustic horn performance

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS545009U (ja) * 1977-06-14 1979-01-13

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1982341A (en) * 1931-03-24 1934-11-27 Westinghouse Electric & Mfg Co Traffic control system
US2542594A (en) * 1946-05-13 1951-02-20 Tiffany Carter Supersonic communication system
US2611445A (en) * 1948-01-29 1952-09-23 Stromberg Carlson Co Echo ranging system
US2815087A (en) * 1955-03-11 1957-12-03 Delort Rene Speaker cabinet
US3046544A (en) * 1960-02-12 1962-07-24 Gen Railway Signal Co Mounting means for electro-ultrasonic transducers
US3087140A (en) * 1960-06-20 1963-04-23 Gen Railway Signal Co Ultrasonic vehicle detection system
US3199074A (en) * 1962-06-08 1965-08-03 Gen Precision Inc Automobile traffic flow analyzer
US3343167A (en) * 1966-10-21 1967-09-19 Sperry Rand Corp Object detection system
US3396366A (en) * 1965-05-18 1968-08-06 Lab For Electronics Inc Ultrasonic wave directive assembly
US3751608A (en) * 1969-04-25 1973-08-07 Akg Akustische Kino Geraete Sound receiver head set or ear phone

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1982341A (en) * 1931-03-24 1934-11-27 Westinghouse Electric & Mfg Co Traffic control system
US2542594A (en) * 1946-05-13 1951-02-20 Tiffany Carter Supersonic communication system
US2611445A (en) * 1948-01-29 1952-09-23 Stromberg Carlson Co Echo ranging system
US2815087A (en) * 1955-03-11 1957-12-03 Delort Rene Speaker cabinet
US3046544A (en) * 1960-02-12 1962-07-24 Gen Railway Signal Co Mounting means for electro-ultrasonic transducers
US3087140A (en) * 1960-06-20 1963-04-23 Gen Railway Signal Co Ultrasonic vehicle detection system
US3199074A (en) * 1962-06-08 1965-08-03 Gen Precision Inc Automobile traffic flow analyzer
US3396366A (en) * 1965-05-18 1968-08-06 Lab For Electronics Inc Ultrasonic wave directive assembly
US3343167A (en) * 1966-10-21 1967-09-19 Sperry Rand Corp Object detection system
US3751608A (en) * 1969-04-25 1973-08-07 Akg Akustische Kino Geraete Sound receiver head set or ear phone

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4192977A (en) * 1976-12-20 1980-03-11 Akg Akustische U. Kino-Gerate Gesellschaft M.B.H. Highly directional ultrasonic electret transducer
US4288867A (en) * 1978-11-14 1981-09-08 Alarm Device Manufacturing Company Area intrusion adjustable detector unit
US4811307A (en) * 1985-05-10 1989-03-07 L'etat Francais Represente Par Le Delegue General Pour L'armement Tonpilz type piezoelectric transducer capable of operating alternately as wideband receiver and emitter
US6628568B1 (en) 2002-03-19 2003-09-30 Bha Group Holdings, Inc. System and method for verification of acoustic horn performance

Also Published As

Publication number Publication date
DE2226306A1 (de) 1972-12-07
DE7220280U (de) 1973-01-04
DE2226306C3 (de) 1974-12-19
GB1378248A (en) 1974-12-27
DE2226306B2 (de) 1974-03-28
JPS485606U (ja) 1973-01-23

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