EP0772373A2 - Arrangement pour le rayonnement d'ondes acoustiques - Google Patents

Arrangement pour le rayonnement d'ondes acoustiques Download PDF

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Publication number
EP0772373A2
EP0772373A2 EP96117145A EP96117145A EP0772373A2 EP 0772373 A2 EP0772373 A2 EP 0772373A2 EP 96117145 A EP96117145 A EP 96117145A EP 96117145 A EP96117145 A EP 96117145A EP 0772373 A2 EP0772373 A2 EP 0772373A2
Authority
EP
European Patent Office
Prior art keywords
layer
membrane
arrangement according
area
arrangement
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Withdrawn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
EP96117145A
Other languages
German (de)
English (en)
Inventor
Stefan Geisenberger
Gunther Raschke
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.)
Nokia Technology GmbH
Original Assignee
Nokia Technology GmbH
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 Nokia Technology GmbH filed Critical Nokia Technology GmbH
Publication of EP0772373A2 publication Critical patent/EP0772373A2/fr
Withdrawn legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/06—Loudspeakers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
    • H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only 
    • H04R1/24—Structural combinations of separate transducers or of two parts of the same transducer and responsive respectively to two or more frequency ranges

Definitions

  • the invention is concerned with arrangements for emitting sound waves, in particular with the simplified design of arrangements in which different frequency signal components of a sound signal are emitted by different transducers.
  • coaxial speaker systems which on the one hand only have the space requirement of broadband loudspeakers, but on the other hand allow different frequency signal components of a sound signal to be transmitted by different converters and thus have a significantly better sound reproduction quality than broadband loudspeakers.
  • Coaxial loudspeaker systems of this type are distinguished by the fact that they have a cone loudspeaker that is optimized for a specific signal component (low-frequency or low-medium frequency).
  • a specific signal component low-frequency or low-medium frequency
  • another loudspeaker usually intended for high-frequency reproduction.
  • the invention is therefore based on the object of specifying an arrangement for reproducing sound waves which significantly reduces the production outlay for coaxial loudspeaker systems.
  • the essential idea of the invention is to at least partially cover the surface of a membrane driven by the voice coil, by means of which the generated sound waves are emitted into the listening room
  • This structure makes it possible, for example, to emit low or medium low-frequency signal components of a sound signal from the membrane, while the high-frequency signal components are emitted by means of the layer which is electrically connected to the audio signal source, by performing an expansion change under the effect of the high-frequency signal component.
  • Suitable materials known to those skilled in the art for forming the layer are the piezoceramic materials specified in claim 2 and the polyvinylidene fluoride films (PVDF) specified in claim 3 and also showing piezoelectric properties.
  • PVDF polyvinylidene fluoride films
  • the PVD foils as material for the layer show only a small change in thickness as part of the change in expansion under the influence of the voltages provided by the high-frequency signal components, a sufficient sound flow can only be generated if the size of the layer, ie the layer surface, is sufficient itself large and / or the signal voltage made available to the layer is high. If a transformation of the signal voltages made available to the layer is to be ruled out, this means that a large part of the surface of the membrane which transmits the low-frequency signal components must be coated with the layer if it lies against the membrane without any distance.
  • the restriction of the layer to the area of the dust protection dome originally used also has the advantage that a spherical radiation characteristic for the high-frequency reproduction can be achieved very easily by a corresponding curvature of the layer in this area.
  • FIG. 1 shows a cone speaker 10 in section.
  • This cone speaker 10 is essentially formed by a speaker basket 11, a magnet system 12 and a voice system 16 formed from the membrane 13, the voice coil support 14 and the voice coil 15.
  • the voice system 16 is inserted into the basket 11, the upper edge 17 of the membrane 13 being connected to the basket 11 by means of a circumferential bead 18 and the voice coil 15 connected to the voice coil support 14 being immersed in an air gap 19 formed in the magnet system 12.
  • the voice coil 15 is fed with the signal voltage of a sound signal source via corresponding supply lines (everything not shown in FIG. 1), the membrane 13 carries out a lifting movement along to the center line. The result of this is that sound waves are emitted from the surface 20 of the membrane 13 in the direction of the listening room 21.
  • the areas 20 of the membrane 13 near the voice coil support 14 are covered with a layer 22 on their surface 20 facing the listening space 21 and this layer 22 also spans the area where the voice coil support 14 is inserted into the Opening cutout 23 of the membrane 13 inserted and connected to it.
  • the layer 22 in the area above the opening cutout 23 therefore takes on the function which is usually performed by the dust protection dome in conventional cone loudspeakers.
  • the layer 22 is enlarged in that it is formed up to or almost up to the upper edge 17 of the membrane 13. If it should be necessary for reasons of enlarging the layer 22, the layer 22 can also be designed to be extended beyond the upper edge 17 of the membrane 13. The latter is indicated in FIG. 1 (left side) by the dash-dotted line.
  • the area which lies above the opening section 23 can also be closed by a conventional dust protection cap, so that the layer 22 also or only covers the surface of this dust protection cap.
  • a conventional dust protection cap when using a conventional dust protection cap, however, this can also be coated with the layer 22 without a gap or can only be placed unfastened over the contour of the conventional dust protection cap and only be connected to the surface 20 of the membrane 13 without a gap.
  • an additional formation of the layer 22 can be dispensed with if, for example, the membrane 13 itself is produced from a material forming the layer 22.
  • Such a self-supporting formation of the layer 22 is shown in FIG. 1 in the area above the opening section 23.
  • the material from which the layer 22 was formed in the exemplary embodiment shown in FIG. 1 is, on the one hand, a piezoceramic material and, alternatively, a polyvinylidene fluoride film is used as the piezoelectric material.
  • the layer 22 is a bimorphic arrangement of two oppositely polarized and mutually bonded longitudinal or radial transducer plates, and if this plate pair is connected in a manner known to the person skilled in the art to an audio signal source (not shown in FIG. 1), then under the influence of the signal voltage an opposite longitudinal or radial expansion is produced in the two plates.
  • This opposite longitudinal or radial expansion of the two plates forming the layer 22 causes a transverse expansion of the plate pair when the plate pair is only clamped at its edge. In other words, such an arrangement acts as a bending vibrator and can be used to emit sound signals.
  • the layer 22 or the plate pair is not clamped at its edge, but is completely connected to another layer (in FIG.
  • the size of the area is increased in relation to the size of the spanned opening cutout 23 in comparison to a flat design of the area due to the curved shape.
  • This increase in area has the result that, under the influence of the signal voltage applied to the layer 22, a greater longitudinal or radial expansion can be achieved, which in turn brings about a greater transverse expansion of the areas mentioned by the lateral clamping of the area spanning the opening section 23. What is understood by a transverse deflection of the area mentioned is shown in dashed lines in Figure 1.
  • the signal voltage introduced into the layer 22 is converted into a transverse deflection with greater efficiency.
  • the dome-shaped or arched design of the region mentioned improves the spherical radiation characteristic of the layer 22, which is particularly advantageous in the case of high-frequency reproduction.
  • the signal voltage made available to the layer 22 can be increased.
  • this areal enlargement of the layer 22 can be carried out, for example, in that the layer 22 covers the surface 20 of the membrane 13 almost completely, ie without any distance up to the upper edge 17.
  • This almost complete coating of the conical membrane 13 can, however, be considered to the spherical radiation pattern, which is desirable for high-frequency reproduction, are not considered to be ideal.
  • FIG. 3 shows an embossed layer 22 which has an embossed pattern in the form of truncated cones 24.
  • This layer 22 is connected in the foot region 24a of the truncated cones 24 to a carrier layer (here a membrane 13).
  • This shape of the layer 22 has the consequence that the surface size of this layer 22 is larger than the surface size of the carrier layer which is covered or spanned by this layer 22.
  • an embossed formation of the layer 22 no longer has to cover or span large surface parts or even the entire surface 20 of the membrane 13 (FIG. 1) due to a sufficient sound flow, an embossed layer 22 can be limited to an area in which in conventionally designed cone speakers, the dust protection cap is arranged.
  • embossed layer 22 to the area of the conventional dust protection cap means that this area can not only be embossed, but can also additionally be curved (FIG. 3), which results in a very good and spherical radiation behavior. Which embossing shape the layer 22 ultimately has depends on the circumstances of the individual case.
  • the embossed contour of the layer 22 shown on the right of the center line in FIG. For the sake of completeness, it should be pointed out that the membrane 13 shown in FIG. 3 and also referred to as the carrier layer can also be a conventionally known dust protection cap in another embodiment (not shown).
  • FIG. 2 shows a loudspeaker 10 in a detail, which differs from the illustration according to FIG. 1 by a slightly changed shape of the membrane 13.
  • This membrane 13 is not conical, but curved in the direction of the listening room 21.
  • the curved surface 20 of the membrane 13 facing the listening space 21 is provided with an embossed layer 22 which is shown in FIG. 2 (left representation).
  • This layer 22 was produced by embossing a PVD film and was glued to the membrane 13.
  • This shape of the membrane 13 on the one hand achieves very good low or medium-low reproduction under the influence of the drive of the voice coil 15 and, on the other hand, a spherical radiation effect during the high-frequency reproduction through the layer 22.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Obtaining Desirable Characteristics In Audible-Bandwidth Transducers (AREA)
EP96117145A 1995-11-04 1996-10-25 Arrangement pour le rayonnement d'ondes acoustiques Withdrawn EP0772373A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19541197 1995-11-04
DE1995141197 DE19541197A1 (de) 1995-11-04 1995-11-04 Anordnung zur Abstrahlung von Schallwellen

Publications (1)

Publication Number Publication Date
EP0772373A2 true EP0772373A2 (fr) 1997-05-07

Family

ID=7776663

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96117145A Withdrawn EP0772373A2 (fr) 1995-11-04 1996-10-25 Arrangement pour le rayonnement d'ondes acoustiques

Country Status (3)

Country Link
EP (1) EP0772373A2 (fr)
JP (1) JPH09215089A (fr)
DE (1) DE19541197A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015002731A1 (fr) * 2013-07-05 2015-01-08 Qualcomm Incorporated Appareil et procédé de fourniture d'une réponse en fréquence pour des signaux audio
WO2016046412A1 (fr) 2014-09-26 2016-03-31 Sennheiser Electronic Gmbh & Co. Kg Transducteur acoustique électrodynamique
EP3926979A1 (fr) * 2020-06-15 2021-12-22 Volvo Car Corporation Appareil haut-parleur

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10238325A1 (de) 2002-08-16 2004-03-11 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Lautsprecher
DE10347021A1 (de) * 2003-10-07 2005-05-04 Werma Signaltechnik Gmbh & Co Kalotte für einen Signalgeber

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4116819A1 (de) 1991-05-23 1992-11-26 Nokia Deutschland Gmbh Staubschutzkalotte fuer konuslautsprecher

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2847665A1 (de) * 1978-11-02 1980-05-14 Siemens Ag Verbesserung einer amplitudenmessvorrichtung fuer die servo-regelung eines lautsprechers
GB2059715B (en) * 1979-09-18 1984-02-01 Standard Telephones Cables Ltd Electro acoustic transducers
DE3808019A1 (de) * 1988-03-10 1989-09-21 Siemens Ag Ultraschall-sensor
US5149470A (en) * 1988-08-24 1992-09-22 Mitsubishi Pencil Co., Ltd. Method of making a diaphragm of carbonaceous material

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4116819A1 (de) 1991-05-23 1992-11-26 Nokia Deutschland Gmbh Staubschutzkalotte fuer konuslautsprecher

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015002731A1 (fr) * 2013-07-05 2015-01-08 Qualcomm Incorporated Appareil et procédé de fourniture d'une réponse en fréquence pour des signaux audio
US20150010176A1 (en) * 2013-07-05 2015-01-08 Qualcomm Incorporated Apparatus and method for providing a frequency response for audio signals
CN105308987A (zh) * 2013-07-05 2016-02-03 高通股份有限公司 用于为音频信号提供频率响应的设备和方法
US9976713B2 (en) * 2013-07-05 2018-05-22 Qualcomm Incorporated Apparatus and method for providing a frequency response for audio signals
WO2016046412A1 (fr) 2014-09-26 2016-03-31 Sennheiser Electronic Gmbh & Co. Kg Transducteur acoustique électrodynamique
DE102014219630A1 (de) * 2014-09-26 2016-03-31 Sennheiser Electronic Gmbh & Co. Kg Elektrodynamischer Schallwandler
US10136224B2 (en) 2014-09-26 2018-11-20 Sennheiser Electronic Gmbh & Co. Kg Electrodynamic sound transducer
EP3926979A1 (fr) * 2020-06-15 2021-12-22 Volvo Car Corporation Appareil haut-parleur

Also Published As

Publication number Publication date
JPH09215089A (ja) 1997-08-15
DE19541197A1 (de) 1997-05-07

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