EP0142178B2 - Ultraschall-Wandler - Google Patents

Ultraschall-Wandler Download PDF

Info

Publication number
EP0142178B2
EP0142178B2 EP84201200A EP84201200A EP0142178B2 EP 0142178 B2 EP0142178 B2 EP 0142178B2 EP 84201200 A EP84201200 A EP 84201200A EP 84201200 A EP84201200 A EP 84201200A EP 0142178 B2 EP0142178 B2 EP 0142178B2
Authority
EP
European Patent Office
Prior art keywords
piezoelectric material
layer
layers
acoustic impedance
medium
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
EP84201200A
Other languages
English (en)
French (fr)
Other versions
EP0142178B1 (de
EP0142178A1 (de
Inventor
Claude Robert Mequio
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.)
Laboratoires dElectronique Philips SAS
Koninklijke Philips NV
Original Assignee
Laboratoires dElectronique Philips SAS
Philips Gloeilampenfabrieken NV
Koninklijke Philips Electronics NV
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 Laboratoires dElectronique Philips SAS, Philips Gloeilampenfabrieken NV, Koninklijke Philips Electronics NV filed Critical Laboratoires dElectronique Philips SAS
Publication of EP0142178A1 publication Critical patent/EP0142178A1/de
Application granted granted Critical
Publication of EP0142178B1 publication Critical patent/EP0142178B1/de
Publication of EP0142178B2 publication Critical patent/EP0142178B2/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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

Definitions

  • the present invention relates to an ultrasonic transducer comprising a substrate constituting a rear medium, a layer of piezoelectric material and one or more adaptation layers, the values of the impedances of the layer of piezoelectric material, acoustic impedance adaptation layers and of the medium before propagation forming, considered in this order, a decreasing sequence.
  • An ultrasonic transducer essentially consists, in a conventional manner, of a substrate constituting a rear absorption or reflection medium, a layer of piezoelectric material equipped with electrodes on its front and rear faces and at least one layer. acoustic impedance matching, placed in front of the piezoelectric material, between it and the propagation medium. Transducers of this type are notably described in the article "The effects of backing and matching on the performance of piezoelectric ceramic transducers" by G. Kossoff, published in the journal IEEE Transactions on sonics and ultrasonics, volume SU-13, March 1966 , pages 20 to 30. The implementation of one or more of these adaptation layers has the main effect of improving the sensitivity of the transducers and also contributes to increasing their bandwidth.
  • the ultrasonic transducers used in ultrasound must combine two main qualities at the level of transduction: not only good sensitivity (because the increase in signal-to-noise ratio facilitates the processing of received signals) but also sufficient damping (because the brevity of the impulse response conditions the axial resolution).
  • the object of the invention is to propose an ultrasonic transducer which easily reconciles the requirements of sensitivity and damping.
  • the invention relates to an ultrasonic transducer as defined in the preamble to the description and further characterized in that the adaptation layers are placed in identical number on either side of the piezoelectric material, the layers located symmetrically two by two having the same acoustic impedance value and the same thickness, in that the rear medium has an acoustic impedance value substantially equal to that of the medium before propagation, and in that the thickness of the layer of piezoelectric material is equal to half the wavelength associated with the resonant frequency of the transducer, so that the structure is symmetrical with respect to the median plane of the layer of piezoelectric material.
  • FIG. 1 shows an embodiment of a transducer according to the invention.
  • the embodiment represented in FIG. 1 consists of an ultrasonic transducer with vibration in thickness mode, totally symmetrical, composed of a substrate 10 constituting the rear medium of the transducer, of a layer 20 of piezoelectric material of thickness equal to the half the wavelength associated with the resonant frequency of the transducer and covered on its front and rear faces with metal sheets 21 and 22 constituting first and second electrodes (connected in a known manner to a polarization circuit not shown which provides the excitation potential), and of two acoustic impedance adaptation layers 30, 40 known as quarter-wave interference layers and situated on the one hand between the rear medium and the piezoelectric material and on the other hand between this material and the medium before propagation 50.
  • the values of the acoustic impedances form a decreasing sequence from that of the piezoelectric material and these impedance values as well as the thicknesses of the adaptation layers 30, 40 are symmetrical on either side of this material. From this symmetry of the structure, it follows that the deformations on the two faces of the piezoelectric material are identical (since these two faces are acoustically charged identically) and that, consequently, the deformation is zero in the median plane of this material. The part of the structure which is located on only one side of this median plane is therefore equivalent to an infinitely rigid rear medium, that is to say with zero deformation.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Transducers For Ultrasonic Waves (AREA)
  • Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)

Claims (1)

  1. Ultraschall-Wandler mit einem Substrat (10), das ein hinteres Medium bildet, einer Schicht piezoelektrischen Materials (20) und einer oder mehreren Anpassungsschichten (30, 40), wobei die Impedanzwerte der piezoelektrischen Materialschicht (20), der Anpassungsschichten für die akustische Impedanz und des vorderen Fortpflanzungsmediums (50) in dieser Reihenfolge eine abfallende Reihe bilden, dadurch gekennzeichnet, daß die Anpassungsschichten (30, 40) in gleicher Anzahl auf beiden Seiten des piezoelektrischen Materials (20) angeordnet sind, wobei die je zwei und zwei symmetrisch angeordneten Schichten den gleichen akustischen Impedanzwert und die gleiche Dicke haben, daß das hintere Medium einen akustischen Impedanzwert im wesentlichen gleich dem des vorderen Fortpflanzungsmediums (50) hat, und daß die Dicke der piezoelektrischen Materialschicht (20) gleich der halben, der Wandler-Resonanzfrequenz zugeordneten Wellenlänge ist, derart, daß die Struktur in bezug auf die Mittelebene der piezoelektrischen Materialschicht symmetrisch ist.
EP84201200A 1983-08-31 1984-08-20 Ultraschall-Wandler Expired - Lifetime EP0142178B2 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8313986A FR2551611B1 (fr) 1983-08-31 1983-08-31 Nouvelle structure de transducteur ultrasonore et appareil d'examen de milieux par echographie ultrasonore comprenant une telle structure
FR8313986 1983-08-31

Publications (3)

Publication Number Publication Date
EP0142178A1 EP0142178A1 (de) 1985-05-22
EP0142178B1 EP0142178B1 (de) 1990-01-03
EP0142178B2 true EP0142178B2 (de) 1994-01-12

Family

ID=9291921

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84201200A Expired - Lifetime EP0142178B2 (de) 1983-08-31 1984-08-20 Ultraschall-Wandler

Country Status (7)

Country Link
US (1) US4771205A (de)
EP (1) EP0142178B2 (de)
JP (1) JPH0640676B2 (de)
CA (1) CA1260603A (de)
DE (1) DE3480968D1 (de)
FR (1) FR2551611B1 (de)
IL (1) IL72791A (de)

Families Citing this family (115)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60100950A (ja) * 1983-11-09 1985-06-04 松下電器産業株式会社 超音波探触子
NL8501908A (nl) * 1985-07-03 1987-02-02 Tno Tastsensor.
US5119840A (en) * 1986-04-07 1992-06-09 Kaijo Kenki Co., Ltd. Ultrasonic oscillating device and ultrasonic washing apparatus using the same
EP0369127A3 (de) * 1988-09-29 1991-11-06 Siemens Aktiengesellschaft Verbund-Ultraschall-Sonarwandler
US5212671A (en) * 1989-06-22 1993-05-18 Terumo Kabushiki Kaisha Ultrasonic probe having backing material layer of uneven thickness
DE3920663A1 (de) * 1989-06-23 1991-01-10 Siemens Ag Breitstrahlender ultraschallwandler
DE59010738D1 (de) * 1990-04-09 1997-08-21 Siemens Ag Frequenzselektiver Ultraschall-Schichtwandler
US5187403A (en) * 1990-05-08 1993-02-16 Hewlett-Packard Company Acoustic image signal receiver providing for selectively activatable amounts of electrical signal delay
US5268610A (en) * 1991-12-30 1993-12-07 Xerox Corporation Acoustic ink printer
US5355048A (en) * 1993-07-21 1994-10-11 Fsi International, Inc. Megasonic transducer for cleaning substrate surfaces
US5777230A (en) * 1995-02-23 1998-07-07 Defelsko Corporation Delay line for an ultrasonic probe and method of using same
EP1003185B2 (de) † 1995-06-19 2009-05-06 Denso Corporation Elektromagnetspule
US5706564A (en) * 1995-07-27 1998-01-13 General Electric Company Method for designing ultrasonic transducers using constraints on feasibility and transitional Butterworth-Thompson spectrum
US5648941A (en) * 1995-09-29 1997-07-15 Hewlett-Packard Company Transducer backing material
US6087198A (en) * 1998-02-12 2000-07-11 Texas Instruments Incorporated Low cost packaging for thin-film resonators and thin-film resonator-based filters
US6049159A (en) * 1997-10-06 2000-04-11 Albatros Technologies, Inc. Wideband acoustic transducer
US6050943A (en) 1997-10-14 2000-04-18 Guided Therapy Systems, Inc. Imaging, therapy, and temperature monitoring ultrasonic system
US5936150A (en) * 1998-04-13 1999-08-10 Rockwell Science Center, Llc Thin film resonant chemical sensor with resonant acoustic isolator
US6051913A (en) * 1998-10-28 2000-04-18 Hewlett-Packard Company Electroacoustic transducer and acoustic isolator for use therein
US6307302B1 (en) * 1999-07-23 2001-10-23 Measurement Specialities, Inc. Ultrasonic transducer having impedance matching layer
US6452310B1 (en) * 2000-01-18 2002-09-17 Texas Instruments Incorporated Thin film resonator and method
KR100602907B1 (ko) * 2000-11-27 2006-07-20 가부시키가이샤 무라타 세이사쿠쇼 복합 진동 장치
US7914453B2 (en) 2000-12-28 2011-03-29 Ardent Sound, Inc. Visual imaging system for ultrasonic probe
US6936009B2 (en) * 2001-02-27 2005-08-30 General Electric Company Matching layer having gradient in impedance for ultrasound transducers
DE10124349A1 (de) * 2001-05-18 2002-12-05 Infineon Technologies Ag Piezoelektrische Resonatorvorrichtung mit Verstimmungsschichtfolge
DE10321701B4 (de) * 2002-05-24 2009-06-10 Murata Manufacturing Co., Ltd., Nagaokakyo Längsgekoppelte piezoelektrische Multi-Mode-Volumenwellenfiltervorrichtung, längsgekoppelter piezoelektrischer Multi-Mode-Volumenwellenfilter und elektronische Komponente
US8221321B2 (en) 2002-06-07 2012-07-17 Verathon Inc. Systems and methods for quantification and classification of fluids in human cavities in ultrasound images
US8221322B2 (en) 2002-06-07 2012-07-17 Verathon Inc. Systems and methods to improve clarity in ultrasound images
US7819806B2 (en) 2002-06-07 2010-10-26 Verathon Inc. System and method to identify and measure organ wall boundaries
US7520857B2 (en) * 2002-06-07 2009-04-21 Verathon Inc. 3D ultrasound-based instrument for non-invasive measurement of amniotic fluid volume
GB2391625A (en) 2002-08-09 2004-02-11 Diagnostic Ultrasound Europ B Instantaneous ultrasonic echo measurement of bladder urine volume with a limited number of ultrasound beams
US20060006765A1 (en) * 2004-07-09 2006-01-12 Jongtae Yuk Apparatus and method to transmit and receive acoustic wave energy
EP1626817A2 (de) * 2003-04-15 2006-02-22 Koninklijke Philips Electronics N.V. Zweidimensionale matrix für die erzeugung von harmonischen in der ultraschallbildererzeugung
US7824348B2 (en) 2004-09-16 2010-11-02 Guided Therapy Systems, L.L.C. System and method for variable depth ultrasound treatment
US9011336B2 (en) * 2004-09-16 2015-04-21 Guided Therapy Systems, Llc Method and system for combined energy therapy profile
US7393325B2 (en) 2004-09-16 2008-07-01 Guided Therapy Systems, L.L.C. Method and system for ultrasound treatment with a multi-directional transducer
US8444562B2 (en) 2004-10-06 2013-05-21 Guided Therapy Systems, Llc System and method for treating muscle, tendon, ligament and cartilage tissue
US7530958B2 (en) * 2004-09-24 2009-05-12 Guided Therapy Systems, Inc. Method and system for combined ultrasound treatment
US8535228B2 (en) 2004-10-06 2013-09-17 Guided Therapy Systems, Llc Method and system for noninvasive face lifts and deep tissue tightening
US10864385B2 (en) 2004-09-24 2020-12-15 Guided Therapy Systems, Llc Rejuvenating skin by heating tissue for cosmetic treatment of the face and body
US8133180B2 (en) 2004-10-06 2012-03-13 Guided Therapy Systems, L.L.C. Method and system for treating cellulite
US7758524B2 (en) 2004-10-06 2010-07-20 Guided Therapy Systems, L.L.C. Method and system for ultra-high frequency ultrasound treatment
US9827449B2 (en) 2004-10-06 2017-11-28 Guided Therapy Systems, L.L.C. Systems for treating skin laxity
US8690778B2 (en) 2004-10-06 2014-04-08 Guided Therapy Systems, Llc Energy-based tissue tightening
US11235179B2 (en) 2004-10-06 2022-02-01 Guided Therapy Systems, Llc Energy based skin gland treatment
ES2747361T3 (es) 2004-10-06 2020-03-10 Guided Therapy Systems Llc Procedimiento para la mejora cosmética no invasiva de la celulitis
US20060111744A1 (en) 2004-10-13 2006-05-25 Guided Therapy Systems, L.L.C. Method and system for treatment of sweat glands
US7530356B2 (en) * 2004-10-06 2009-05-12 Guided Therapy Systems, Inc. Method and system for noninvasive mastopexy
US11883688B2 (en) 2004-10-06 2024-01-30 Guided Therapy Systems, Llc Energy based fat reduction
US9694212B2 (en) 2004-10-06 2017-07-04 Guided Therapy Systems, Llc Method and system for ultrasound treatment of skin
KR20110091828A (ko) 2004-10-06 2011-08-12 가이디드 테라피 시스템스, 엘.엘.씨. 미용 초음파 치료 시스템
US11724133B2 (en) 2004-10-07 2023-08-15 Guided Therapy Systems, Llc Ultrasound probe for treatment of skin
US11207548B2 (en) 2004-10-07 2021-12-28 Guided Therapy Systems, L.L.C. Ultrasound probe for treating skin laxity
EP2533130A1 (de) 2005-04-25 2012-12-12 Ardent Sound, Inc. Verfahren und System zur Verbesserung der peripheren Computersicherheit
US9566454B2 (en) * 2006-09-18 2017-02-14 Guided Therapy Systems, Llc Method and sysem for non-ablative acne treatment and prevention
US20150174388A1 (en) 2007-05-07 2015-06-25 Guided Therapy Systems, Llc Methods and Systems for Ultrasound Assisted Delivery of a Medicant to Tissue
US9216276B2 (en) 2007-05-07 2015-12-22 Guided Therapy Systems, Llc Methods and systems for modulating medicants using acoustic energy
US8167803B2 (en) 2007-05-16 2012-05-01 Verathon Inc. System and method for bladder detection using harmonic imaging
US7804742B2 (en) * 2008-01-29 2010-09-28 Hyde Park Electronics Llc Ultrasonic transducer for a proximity sensor
US8456957B2 (en) * 2008-01-29 2013-06-04 Schneider Electric USA, Inc. Ultrasonic transducer for a proximity sensor
US8129886B2 (en) * 2008-02-29 2012-03-06 General Electric Company Apparatus and method for increasing sensitivity of ultrasound transducers
KR20110020293A (ko) 2008-06-06 2011-03-02 얼테라, 인크 코스메틱 치료 및 이미징 시스템 및 방법
JP5658151B2 (ja) 2008-08-07 2015-01-21 ベラソン インコーポレイテッドＶｅｒａｔｈｏｎ Ｉｎｃ． 腹部大動脈瘤の直径を測定するための装置、システム、方法
EP2382010A4 (de) 2008-12-24 2014-05-14 Guided Therapy Systems Llc Verfahren und systeme zur fettreduzierung und/oder behandlung von cellulite
US9068775B2 (en) 2009-02-09 2015-06-30 Heat Technologies, Inc. Ultrasonic drying system and method
US8264126B2 (en) 2009-09-01 2012-09-11 Measurement Specialties, Inc. Multilayer acoustic impedance converter for ultrasonic transducers
US8715186B2 (en) 2009-11-24 2014-05-06 Guided Therapy Systems, Llc Methods and systems for generating thermal bubbles for improved ultrasound imaging and therapy
KR101173277B1 (ko) * 2010-03-15 2012-08-13 주식회사 휴먼스캔 후면 음향 정합층을 이용한 초음파 프로브
EP2600783A4 (de) 2010-08-02 2017-05-17 Guided Therapy Systems, L.L.C. Ultraschallbehandlungssysteme und -verfahren
US9504446B2 (en) 2010-08-02 2016-11-29 Guided Therapy Systems, Llc Systems and methods for coupling an ultrasound source to tissue
US8857438B2 (en) 2010-11-08 2014-10-14 Ulthera, Inc. Devices and methods for acoustic shielding
WO2013009785A2 (en) 2011-07-10 2013-01-17 Guided Therapy Systems, Llc. Systems and methods for improving an outside appearance of skin using ultrasound as an energy source
KR20190080967A (ko) 2011-07-11 2019-07-08 가이디드 테라피 시스템스, 엘.엘.씨. 조직에 초음파원을 연결하는 시스템 및 방법
US9263663B2 (en) 2012-04-13 2016-02-16 Ardent Sound, Inc. Method of making thick film transducer arrays
US9510802B2 (en) 2012-09-21 2016-12-06 Guided Therapy Systems, Llc Reflective ultrasound technology for dermatological treatments
EP2775731A1 (de) 2013-03-05 2014-09-10 British Telecommunications public limited company Bereitstellung von Videodaten
EP2775730A1 (de) 2013-03-05 2014-09-10 British Telecommunications public limited company Videodatenbereitstellung
CN113648551A (zh) 2013-03-08 2021-11-16 奥赛拉公司 用于多焦点超声治疗的装置和方法
WO2014146022A2 (en) 2013-03-15 2014-09-18 Guided Therapy Systems Llc Ultrasound treatment device and methods of use
GB2513884B (en) 2013-05-08 2015-06-17 Univ Bristol Method and apparatus for producing an acoustic field
EP2819418A1 (de) 2013-06-27 2014-12-31 British Telecommunications public limited company Bereitstellung von Videodaten
US9612658B2 (en) 2014-01-07 2017-04-04 Ultrahaptics Ip Ltd Method and apparatus for providing tactile sensations
EP3131630B1 (de) 2014-04-18 2023-11-29 Ulthera, Inc. Bandwandlerultraschalltherapie
GB2530036A (en) 2014-09-09 2016-03-16 Ultrahaptics Ltd Method and apparatus for modulating haptic feedback
JP2016086956A (ja) * 2014-10-31 2016-05-23 セイコーエプソン株式会社 超音波プローブ並びに電子機器および超音波画像装置
ES2731673T3 (es) 2015-02-20 2019-11-18 Ultrahaptics Ip Ltd Procedimiento para producir un campo acústico en un sistema háptico
MX2017010252A (es) 2015-02-20 2018-03-07 Ultrahaptics Ip Ltd Mejoras de algoritmos en un sistema haptico.
US10134973B2 (en) * 2015-03-02 2018-11-20 Edan Instruments, Inc. Ultrasonic transducer and manufacture method thereof
US10326072B2 (en) 2015-05-11 2019-06-18 Measurement Specialties, Inc. Impedance matching layer for ultrasonic transducers with metallic protection structure
US10818162B2 (en) 2015-07-16 2020-10-27 Ultrahaptics Ip Ltd Calibration techniques in haptic systems
US11189140B2 (en) 2016-01-05 2021-11-30 Ultrahaptics Ip Ltd Calibration and detection techniques in haptic systems
FI3405294T3 (fi) 2016-01-18 2023-03-23 Ulthera Inc Pienikokoinen ultraäänilaite, jossa on renkaan muotoinen ultraääniryhmä, joka on yhdistetty sähköisesti reunalle taipuisaan piirilevyyn
US10531212B2 (en) 2016-06-17 2020-01-07 Ultrahaptics Ip Ltd. Acoustic transducers in haptic systems
US10268275B2 (en) 2016-08-03 2019-04-23 Ultrahaptics Ip Ltd Three-dimensional perceptions in haptic systems
US10755538B2 (en) 2016-08-09 2020-08-25 Ultrahaptics ilP LTD Metamaterials and acoustic lenses in haptic systems
DK3981466T3 (da) 2016-08-16 2023-10-09 Ulthera Inc Systemer og fremgangsmåder til kosmetisk ultralydsbehandling af hud
US10943578B2 (en) 2016-12-13 2021-03-09 Ultrahaptics Ip Ltd Driving techniques for phased-array systems
US10497358B2 (en) 2016-12-23 2019-12-03 Ultrahaptics Ip Ltd Transducer driver
EP3384849B1 (de) * 2017-04-07 2022-06-08 Esaote S.p.A. Ultraschallsonde mit akustischem verstärker
US11531395B2 (en) 2017-11-26 2022-12-20 Ultrahaptics Ip Ltd Haptic effects from focused acoustic fields
JP7029588B2 (ja) * 2017-12-06 2022-03-04 パナソニックＩｐマネジメント株式会社 超音波センサー
EP3729418A1 (de) 2017-12-22 2020-10-28 Ultrahaptics Ip Ltd Minimierung von unerwünschten antworten in haptischen systemen
WO2019122912A1 (en) 2017-12-22 2019-06-27 Ultrahaptics Limited Tracking in haptic systems
WO2019164836A1 (en) 2018-02-20 2019-08-29 Ulthera, Inc. Systems and methods for combined cosmetic treatment of cellulite with ultrasound
SG11202010752VA (en) 2018-05-02 2020-11-27 Ultrahaptics Ip Ltd Blocking plate structure for improved acoustic transmission efficiency
US11098951B2 (en) 2018-09-09 2021-08-24 Ultrahaptics Ip Ltd Ultrasonic-assisted liquid manipulation
US11378997B2 (en) 2018-10-12 2022-07-05 Ultrahaptics Ip Ltd Variable phase and frequency pulse-width modulation technique
EP3906462A2 (de) 2019-01-04 2021-11-10 Ultrahaptics IP Ltd Haptische texturen in der luft
US11842517B2 (en) 2019-04-12 2023-12-12 Ultrahaptics Ip Ltd Using iterative 3D-model fitting for domain adaptation of a hand-pose-estimation neural network
US11374586B2 (en) 2019-10-13 2022-06-28 Ultraleap Limited Reducing harmonic distortion by dithering
CN114631139A (zh) 2019-10-13 2022-06-14 超飞跃有限公司 利用虚拟麦克风进行动态封顶
US11169610B2 (en) 2019-11-08 2021-11-09 Ultraleap Limited Tracking techniques in haptic systems
US11715453B2 (en) 2019-12-25 2023-08-01 Ultraleap Limited Acoustic transducer structures
US11816267B2 (en) 2020-06-23 2023-11-14 Ultraleap Limited Features of airborne ultrasonic fields
US11886639B2 (en) 2020-09-17 2024-01-30 Ultraleap Limited Ultrahapticons

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2427348A (en) * 1941-08-19 1947-09-16 Bell Telephone Labor Inc Piezoelectric vibrator
US3946149A (en) * 1974-10-24 1976-03-23 Cbs Inc. Apparatus for embossing information on a disc
AT353506B (de) * 1976-10-19 1979-11-26 List Hans Piezoelektrischer resonator
US4096756A (en) * 1977-07-05 1978-06-27 Rca Corporation Variable acoustic wave energy transfer-characteristic control device
JPS54131380A (en) * 1978-03-31 1979-10-12 Hitachi Medical Corp Dumbbell type ultrasonic wave detecting contacting piece
US4211948A (en) * 1978-11-08 1980-07-08 General Electric Company Front surface matched piezoelectric ultrasonic transducer array with wide field of view
EP0015886A1 (de) * 1979-03-13 1980-09-17 Toray Industries, Inc. Verbessertes elektro-akustisches Wandler-Element
US4383194A (en) * 1979-05-01 1983-05-10 Toray Industries, Inc. Electro-acoustic transducer element
US4297607A (en) * 1980-04-25 1981-10-27 Panametrics, Inc. Sealed, matched piezoelectric transducer
US4434384A (en) * 1980-12-08 1984-02-28 Raytheon Company Ultrasonic transducer and its method of manufacture
JPS57170708U (de) * 1981-04-20 1982-10-27
JPS5817358A (ja) * 1981-07-23 1983-02-01 Toshiba Corp 超音波探触子
US4507582A (en) * 1982-09-29 1985-03-26 New York Institute Of Technology Matching region for damped piezoelectric ultrasonic apparatus
JPS59166139A (ja) * 1983-03-10 1984-09-19 富士通株式会社 超音波トランスデュ−サ

Also Published As

Publication number Publication date
CA1260603A (en) 1989-09-26
FR2551611A1 (fr) 1985-03-08
JPH0640676B2 (ja) 1994-05-25
DE3480968D1 (de) 1990-02-08
EP0142178B1 (de) 1990-01-03
EP0142178A1 (de) 1985-05-22
IL72791A0 (en) 1984-11-30
JPS6084099A (ja) 1985-05-13
IL72791A (en) 1988-08-31
FR2551611B1 (fr) 1986-10-24
US4771205A (en) 1988-09-13

Similar Documents

Publication Publication Date Title
EP0142178B2 (de) Ultraschall-Wandler
US6049159A (en) Wideband acoustic transducer
US4353046A (en) Surface acoustic wave device with reflectors
EP0285482B1 (de) Akustischer Multifrequenzwandler, insbesondere für medizinische Abbildung
WO1996001702A1 (fr) Transducteur acoustique multifrequences a bandes larges
EP3230770B1 (de) Perforiertes piezoelektrisches hydrophon, antenne mit einer vielzahl von hydrophonen und verfahren zur herstellung des besagten hydrophons
EP0513085B2 (de) Akustische oberflächenwellenfilter
EP1222735A1 (de) Akustisches grenzflächenwellenfilter insbesondere für drahtlose übertragungssysteme
EP0354117A1 (de) Piezoelektrischer Wandler zur Volumenwellenerregung
EP2367640B1 (de) Schallwellenwandler und sonarantenne mit verbesserter ausrichtung
WO1994007307A1 (fr) Transducteur d'ondes unidirectionnel
FR2466164A1 (fr) Transducteur ultrasonore a sensibilite variable et dispositif d'emission-reception ultrasonore equipe de ce transducteur
EP0498793B1 (de) Verfahren zur herstellung eines akustischen sensors und so erhaltener sensor mit absolut nichtlösender schutzschicht
EP0424240B1 (de) Richtwandler für Oberflächenwellen
FR2546703A1 (fr) Nouvelle structure de transducteur ultrasonore
WO2023247639A1 (fr) Transducteur ultrasonique pour application à haute température
FR2581819A1 (fr) Transducteurs piezo-electriques de type tonpilz recepteurs a large bande et emetteurs et antenne de sonar composee de ces transducteurs
EP0136942B1 (de) Selbstaufgehängter Resonator mit hohem Gütefaktor
FR2476360A1 (de)
Masson et al. Imaginary branches of SAW slowness curves
FR2706601A1 (fr) Dispositif réducteur de bruit propre pour torpilles sous-marines.
Omori SAW Devices 3
EP0290557A1 (de) Echographie-wandler mit einer anordnung von piezoelektrischen elementen
FR2788928A1 (fr) Hydrophone directif a large bande, notamment pour antenne acoustique lineaire remorquee

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): DE FR GB SE

17P Request for examination filed

Effective date: 19851121

17Q First examination report despatched

Effective date: 19870305

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE FR GB SE

RAP2 Party data changed (patent owner data changed or rights of a patent transferred)

Owner name: N.V. PHILIPS' GLOEILAMPENFABRIEKEN

Owner name: LABORATOIRES D'ELECTRONIQUE PHILIPS

REF Corresponds to:

Ref document number: 3480968

Country of ref document: DE

Date of ref document: 19900208

GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)
PLBI Opposition filed

Free format text: ORIGINAL CODE: 0009260

26 Opposition filed

Opponent name: SIEMENS AKTIENGESELLSCHAFT, BERLIN UND MUENCHEN

Effective date: 19901002

PUAH Patent maintained in amended form

Free format text: ORIGINAL CODE: 0009272

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: PATENT MAINTAINED AS AMENDED

27A Patent maintained in amended form

Effective date: 19940112

AK Designated contracting states

Kind code of ref document: B2

Designated state(s): DE FR GB SE

GBTA Gb: translation of amended ep patent filed (gb section 77(6)(b)/1977)

Effective date: 19940323

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 19940728

Year of fee payment: 11

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 19940825

Year of fee payment: 11

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: SE

Payment date: 19940826

Year of fee payment: 11

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 19941026

Year of fee payment: 11

EAL Se: european patent in force in sweden

Ref document number: 84201200.7

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Effective date: 19950820

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Effective date: 19950821

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 19950820

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Effective date: 19960430

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Effective date: 19960501

EUG Se: european patent has lapsed

Ref document number: 84201200.7

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST