EP0337062A2 - Transducteur acousto-électrique - Google Patents

Transducteur acousto-électrique Download PDF

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Publication number
EP0337062A2
EP0337062A2 EP89101963A EP89101963A EP0337062A2 EP 0337062 A2 EP0337062 A2 EP 0337062A2 EP 89101963 A EP89101963 A EP 89101963A EP 89101963 A EP89101963 A EP 89101963A EP 0337062 A2 EP0337062 A2 EP 0337062A2
Authority
EP
European Patent Office
Prior art keywords
corrugated
support body
band
coil
tape
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.)
Withdrawn
Application number
EP89101963A
Other languages
German (de)
English (en)
Other versions
EP0337062A3 (fr
Inventor
Siegfried Dr. Klein
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0337062A2 publication Critical patent/EP0337062A2/fr
Publication of EP0337062A3 publication Critical patent/EP0337062A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R15/00—Magnetostrictive transducers

Definitions

  • the invention relates to an acoustoelectric transducer with a support body carrying coil turns, in particular an oscillating hollow body with a curved surface, such as a magnetostrictive ball.
  • a generic acoustic transducer is known from EP-A-0 177 383, to which reference is made in full.
  • the document shows an omnidirectional, that is to say emitting in all directions, electroacoustic transducer with a spherical in a preferred embodiment
  • Body made of magnetostrictive material that can contract and expand in a magnetic field and thus generate air vibrations by its movement in a suitable modulated field and can thus serve as a loudspeaker.
  • the magnetostrictive is used as a support body for a coil winding generating the modulated magnetic field in the form of windings made of round copper wire which are tightly wound on the support body.
  • the invention is therefore based on the object to further develop the known transducer while avoiding the advantages mentioned in that, with simple application of the coil turns, a uniform distribution of the modulation energy is achieved without impairing the vibration behavior of the magnetostrictive body, in particular transducers of large dimensions, and therefore suitable for deep ones Frequencies are available.
  • the above object is achieved in an acoustoelectric transducer of the type mentioned at the outset in that the coil is placed on the support body as a strip of flat material which is corrugated transversely to the direction of travel.
  • the band corrugated to the direction of travel it is initially meant that the waves and valleys of the corrugated band extend transversely to the direction of travel thereof and alternate with one another in the direction of travel.
  • the invention achieves an optimally uniform distribution of the modulation energy.
  • the conductive ribbon can easily swing with the support body.
  • the corrugated tape lies only with its troughs on the support body, while it extends freely between the corresponding support lines.
  • the band is made of copper material, which on the one hand has the suitable desired elastomechanical properties - namely flexibly deformable but without its own strong elastic restoring forces - and is also the suitable material due to a low specific resistance in electrical terms.
  • Aluminum has a somewhat lower but still very good conductivity compared to copper, but it has a lower mass and a ribbon made of this material and therefore has less influence on the oscillation of the magnetostrictive sphere than a copper ribbon.
  • the ribbon can be easily applied. It has been found that, particularly in the case of larger transducers with diameters in the range of a few decimeters, the flat material is the suitable material, inter alia because it does not twist. Due to its transverse corrugation, the corrugated flat band adapts optimally to the double-curved support body, such as, in particular, a sphere, but also a rotational ellipsoid with a curved generator. In the corrugated form, it can be conveniently applied to larger bodies with a curved surface, such as, in particular, a sphere, since it can adapt to the curved shape due to the transverse waves. With such larger vibrating bodies with dimensions in the range of several decimeters and more, it contains the only practicable solution.
  • corrugated conductor tracks are also on the supporting body, In particular, a ball can only be wound or possibly held in any way, so a preferred embodiment provides that the tape is glued to the support body.
  • the corrugated tape is glued to the support body only in the area of its troughs, while the crests of the waves rise freely from the support body, so that they can easily be subject to the above-mentioned deformation. There are various options for sticking.
  • the corrugated tape itself is provided on the back with an adhesive layer, for example in the form of a double-sided adhesive tape, that is to say an adhesive tape which is coated on both sides with adhesive.
  • the support body is provided with adhesive, if necessary.
  • the corrugated conduction band and / or the support body could also be provided with a thermoplastic layer, whereupon the corrugated conduction band is applied to the support body with heating, so that it is firmly connected to the support body after cooling and thus solidification of the thermoplastic layer.
  • the width of the corrugated conduction band can in principle be selected in a wide range and depends on the winding length, the desired impedance and the desired number of turns for a given thickness of the material. It is preferably provided that the width of the corrugated band is between 0.5 to 2.0 percent of the diameter of the support body, typical widths being between 5 and 10 mm.
  • the distance between the turns should be chosen to be as small as possible without mutual contact in order to avoid or largely reduce electromagnetic coupling losses. In practice, depending on the size of the sphere, distances of the order of a millimeter and less can be achieved.
  • the invention ensures that both the inductive magnetic coupling between the ball and this module lationsbändchen is maximum and can be distributed evenly over the entire surface and that the inductive coupling losses at the lower frequencies are largely avoided as well as that the impedance can be brought to a desired value, for example 4 ohms. These goals would not be achievable with a round wire that would either have too high an impedance or, in the case of a strong version, because of its strength, would result in poor coupling and losses.
  • the tape is applied to the magnetostrictive ball via an insulating layer (adhesive, etc.) and vibrates with it, without affecting its vibration behavior in any way. If a higher resistance of the coil band is desired, a conductive material other than the copper which is suitable per se, for example in particular nickel, can also be used.
  • the acoustic transducer 1 has a spherical support body 2, which consists of magnetostrictive material, such as a nickel-cobalt alloy with a high nickel content, or else has a layer of such material on an insulating elastic carrier.
  • a spherical support body 2 which consists of magnetostrictive material, such as a nickel-cobalt alloy with a high nickel content, or else has a layer of such material on an insulating elastic carrier.
  • an electrically insulated conductor in the form of a transversely corrugated conductive tape 3 applied.
  • FIG. 1 shows a schematic representation of the guidance and corrugation of the ribbon, which as such is shown in part in FIG.
  • the insulation can be formed by an attachment layer 4 applied to the back of the corrugated conductive tape 3.
  • the layer 4 can be an adhesive layer, for example in the form of a double-sided adhesive tape. It can also be a thermoplastic layer, by means of which the corrugated band 3 is attached to the support
  • the support body 2 can also directly with an insulating layer, also in the form of a thermoplastic layer or an adhesive layer, if necessary. be provided in the form of a coiled adhesive tape on both sides, whereupon a corrugated conduction tape 3 is applied without its own rear attachment layer and fixed in this way.
  • the conduction band 3 is preferably made of copper. The conduction band 3 is wound onto the support body 2 in the manner shown in FIG. 1, and because of its corrugated configuration it adapts easily and simply to the contour of the support body 2, which can in principle be of any type.
  • the corrugated band 3 is flexible, so that it flexibly adapts to the vibrations of the support body 2, which consist of an increase or decrease in radius, so that no stresses occur and in particular the vibration behavior of the body 2 due to the electrical conductor 3 formed coil is not affected in any way.
  • the ends 6, 7 of the corrugated band 3 are connected to a voltage source 8 which supplies the suitable modulated voltage, if necessary. via impedance converters and with the provision of other suitable electronic components, as are discussed in EP-A-0 177 383.
  • the corrugated band has such a width that it can be applied to the carrier 2 with a sufficient number of mutually electrically separated, that is, spaced turns. Accordingly, the width of the band is preferably in the range of 0.5 to 2 percent of the diameter of a rotating body, preferably a sphere, for example in the case of a supporting body for a loudspeaker covering the usual frequency range from low to high tones with a supporting body diameter of the order of magnitude of a few Decimeters in the range of 5 to 10 mm.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
  • Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
  • Transducers For Ultrasonic Waves (AREA)
  • Apparatuses For Generation Of Mechanical Vibrations (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
EP19890101963 1988-03-19 1989-02-04 Transducteur acousto-électrique Withdrawn EP0337062A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE8803776U 1988-03-19
DE8803776U DE8803776U1 (de) 1988-03-19 1988-03-19 Akustoelektrischer Wandler

Publications (2)

Publication Number Publication Date
EP0337062A2 true EP0337062A2 (fr) 1989-10-18
EP0337062A3 EP0337062A3 (fr) 1991-12-27

Family

ID=6822092

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19890101963 Withdrawn EP0337062A3 (fr) 1988-03-19 1989-02-04 Transducteur acousto-électrique

Country Status (3)

Country Link
US (1) US4924503A (fr)
EP (1) EP0337062A3 (fr)
DE (1) DE8803776U1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2181231C2 (ru) * 1997-09-30 2002-04-10 Санкт-Петербургский государственный университет Магнитострикционный преобразователь

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2648664A1 (fr) * 1989-06-15 1990-12-21 Commissariat Energie Atomique Haut-parleur omnidirectionnel a membrane spherique utilisant un ruban magnetostrictif
US5307082A (en) * 1992-10-28 1994-04-26 North Carolina State University Electrostatically shaped membranes
US5458120A (en) * 1993-12-08 1995-10-17 General Electric Company Ultrasonic transducer with magnetostrictive lens for dynamically focussing and steering a beam of ultrasound energy
US5381068A (en) * 1993-12-20 1995-01-10 General Electric Company Ultrasonic transducer with selectable center frequency
US20080282812A1 (en) * 2007-05-15 2008-11-20 Thaddeus Schroeder Magnetostrictive load sensor and method of manufacture

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2503515B1 (fr) * 1981-04-01 1985-12-27 Klein Siegfried Haut-parleur omnidirectionnel pour les frequences aigues du spectre sonore
DE3138566A1 (de) * 1981-09-28 1983-04-07 Siegfried Dr. 75009 Paris Klein Lautsprecher, insbesondere hochtonlautsprecher
US4782471A (en) * 1984-08-28 1988-11-01 Commissariat A L'energie Atomique Omnidirectional transducer of elastic waves with a wide pass band and production process
FR2573270B1 (fr) * 1984-11-13 1987-01-23 Commissariat Energie Atomique Transducteur omnidirectionnel d'ondes elastiques a large bande passante mettant en oeuvre un bobinage spherique magnetostrictif et procede de fabrication
FR2619481B1 (fr) * 1987-08-14 1989-11-17 Commissariat Energie Atomique Transducteur omnidirectionnel d'ondes elastiques a large bande passante

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2181231C2 (ru) * 1997-09-30 2002-04-10 Санкт-Петербургский государственный университет Магнитострикционный преобразователь

Also Published As

Publication number Publication date
US4924503A (en) 1990-05-08
DE8803776U1 (de) 1988-05-11
EP0337062A3 (fr) 1991-12-27

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