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GB1314818A - Acoustical transducers - Google Patents

Acoustical transducers

Info

Publication number
GB1314818A
GB1314818A GB3805269A GB1314818DA GB1314818A GB 1314818 A GB1314818 A GB 1314818A GB 3805269 A GB3805269 A GB 3805269A GB 1314818D A GB1314818D A GB 1314818DA GB 1314818 A GB1314818 A GB 1314818A
Authority
GB
United Kingdom
Prior art keywords
piezo
response
boundary
transducer
electric
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
Application number
GB3805269A
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.)
Philips Components Ltd
Original Assignee
Mullard 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 Mullard Ltd filed Critical Mullard Ltd
Publication of GB1314818A publication Critical patent/GB1314818A/en
Expired legal-status Critical Current

Links

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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R15/00—Magnetostrictive transducers
    • 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
    • Y10T29/42—Piezoelectric device making

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Transducers For Ultrasonic Waves (AREA)

Abstract

1314818 Piezo-electric elements MULLARD Ltd 27 July 1970 [29 July 1969] 38052/69 Heading H1E [Also in Division H3] In order to improve the bandwidth and impedance matching of a piezo-electric or piezomagnetic transducer attached to a propagating body, e.g. a delay line, the amplitude of the response of the transducer is arranged to decrease continuously in the direction of propagation from a maximum at the boundary of the transducer remote from the propagating body to zero at the boundary adjacent the body, substantially in accordance with the function where d is the total distance between the boundaries and x is the distance from the first boundary at which the response is measured. It is stated that the prescribed variation produces a reactive acoustic impedance which does not change sign (i.e. remains negative) throughout the pass-band and an acoustic resistance which remains substantially constant. The necessary gradation of response may be obtained either by varying the properties of the piezoelectric or piezo-magnetic material or by varying the electric or magnetic field. A combination of both methods may be used. The methods described in Specification 1,208,154 for obtaining a linear variation may be adapted to produce the variation required by the present invention.
GB3805269A 1969-07-29 1969-07-29 Acoustical transducers Expired GB1314818A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3805269 1969-07-29

Publications (1)

Publication Number Publication Date
GB1314818A true GB1314818A (en) 1973-04-26

Family

ID=10400842

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3805269A Expired GB1314818A (en) 1969-07-29 1969-07-29 Acoustical transducers

Country Status (5)

Country Link
US (1) US3671784A (en)
CA (1) CA948304A (en)
DE (1) DE2038687A1 (en)
FR (1) FR2064799A5 (en)
GB (1) GB1314818A (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4195244A (en) * 1978-07-26 1980-03-25 The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration CdS Solid state phase insensitive ultrasonic transducer
US4654546A (en) * 1984-11-20 1987-03-31 Kari Kirjavainen Electromechanical film and procedure for manufacturing same
US5300852A (en) * 1991-10-04 1994-04-05 Honda Giken Kogyo Kabushiki Kaisha Piezoelectric ceramic laminate device
JP3358851B2 (en) * 1993-03-11 2002-12-24 本田技研工業株式会社 Moisture sensitive actuator
EP0634227B1 (en) * 1993-07-15 1999-10-06 General Electric Company Broadband ultrasonic transducers and related method of manufacture
US7081693B2 (en) * 2002-03-07 2006-07-25 Microstrain, Inc. Energy harvesting for wireless sensor operation and data transmission
US20070042816A1 (en) * 2005-08-15 2007-02-22 Idt Communication Technology Limited Handheld communication device with key-lock

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3192420A (en) * 1961-01-26 1965-06-29 Automation Ind Inc Electro-mechanical transducers and the fabrication thereof
US3505657A (en) * 1965-07-20 1970-04-07 Us Navy Torsional delay line and impressed flux linkage interaction device
DE1541523B1 (en) * 1965-12-21 1970-07-09 Nippon Electric Co Piezoelectric electroacoustic transducer element and method for its manufacture
FR1482899A (en) * 1966-03-17 1967-06-02 Csf Dispersive acoustic lines

Also Published As

Publication number Publication date
DE2038687A1 (en) 1971-02-04
US3671784A (en) 1972-06-20
CA948304A (en) 1974-05-28
FR2064799A5 (en) 1971-07-23

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PLNP Patent lapsed through nonpayment of renewal fees