EP0518041B1 - Ventilierter Lautsprecher - Google Patents

Ventilierter Lautsprecher Download PDF

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Publication number
EP0518041B1
EP0518041B1 EP92107233A EP92107233A EP0518041B1 EP 0518041 B1 EP0518041 B1 EP 0518041B1 EP 92107233 A EP92107233 A EP 92107233A EP 92107233 A EP92107233 A EP 92107233A EP 0518041 B1 EP0518041 B1 EP 0518041B1
Authority
EP
European Patent Office
Prior art keywords
loudspeaker
flow channels
mid
frame
range
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
EP92107233A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0518041A1 (de
Inventor
Leonhard Dipl.-Phys. Kreitmeier
Leander Dipl.-Ing. Scholz
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 Deutschland GmbH
Original Assignee
Nokia Deutschland 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 Deutschland GmbH filed Critical Nokia Deutschland GmbH
Publication of EP0518041A1 publication Critical patent/EP0518041A1/de
Application granted granted Critical
Publication of EP0518041B1 publication Critical patent/EP0518041B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/02—Casings; Cabinets ; Supports therefor; Mountings therein
    • H04R1/025—Arrangements for fixing loudspeaker transducers, e.g. in a box, furniture
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; 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 
    • H04R1/28—Transducer mountings or enclosures modified by provision of mechanical or acoustic impedances, e.g. resonator, damping means
    • H04R1/2869—Reduction of undesired resonances, i.e. standing waves within enclosure, or of undesired vibrations, i.e. of the enclosure itself
    • H04R1/2892—Mountings or supports for transducers
    • H04R1/2896—Mountings or supports for transducers for loudspeaker transducers

Definitions

  • the invention is concerned with the mutual decoupling of several loudspeakers arranged in a housing.
  • Loudspeakers of the type specified above have long been known in the prior art. Representative of the training and functioning of loudspeakers, reference is made to the essay in Funkschau 1983, issue 7, page 99 ff.
  • a mid-range speaker and a bass speaker are to be used in a speaker cabinet, it is customary to provide the mid-range speaker with a separate volume that is completely decoupled from the woofer volume. This is achieved in that the mid-range speaker is provided with a completely closed housing towards the bass volume.
  • This measure must be taken is that without the additional housing realized decoupling of the low-frequency volume from the mid-range volume, the pressure waves of the low-frequency loudspeaker cause deflections of the mid-range loudspeaker. Such deflections lead to distortions in the mid-range. Damage to the mid-range loudspeaker cannot be ruled out due to the deflection of the mid-range loudspeaker due to pressure waves.
  • the openings in the loudspeaker basket are filled with a damping means, for example gauze, for damping the low-frequency waves acting on the mid-range loudspeaker. This reduces the influence on the mid-range loudspeaker by the woofer, but not - as with a completely closed housing - not entirely excluded.
  • a damping means for example gauze
  • mid-range loudspeaker basket of the mid-range loudspeaker design the loudspeaker basket of the mid-range loudspeaker to be completely closed and thus to use the space between the membrane and the loudspeaker basket as "mid-range volume".
  • Such mid-range loudspeakers which also form the starting point for the present invention, have a high natural resonance component and are difficult to dampen.
  • the invention is therefore based on the object of specifying a mid-range loudspeaker which manages without a separate mid-range volume formed by housing walls, but which has a significantly reduced inherent resonance component.
  • the peripheral edge of the loudspeaker basket, with which the loudspeaker is fastened in the opening of the installation wall, is provided with flow channels which connect the space existing between the loudspeaker basket and the membrane to the space in which into which the sound pressure of the speaker is to be emitted.
  • a meandering flow channel can have an area B which is provided with damping material.
  • FIG. 1 shows a mid-high-range loudspeaker 10 which is inserted into the opening 11 of a mounting wall 12 of a box housing.
  • the mid-high speaker 10 is essentially conventional.
  • the magnet system 13 is firmly attached to one end of the speaker basket 14.
  • the membrane 15 is arranged inside the loudspeaker basket 14.
  • the upper edge of the diaphragm 15 is connected by means of a bead 16 to the other end of the loudspeaker basket 14 which has a peripheral edge 17.
  • the other end of the membrane 15 protrudes with the voice coil 19 arranged on the voice coil support 18 into the air gap 20 of the magnet system 13.
  • the centering of the voice coil bobbin 18 in the air gap 20 is performed by a centering membrane 21 in the form of an accordion taken over, which extends between the voice coil bobbin 18 and the inner wall of the speaker basket 14.
  • FIGS. 2 and 3 which clearly illustrate this.
  • the closedness caused by the closed construction of the loudspeaker basket 14 means that sound waves, which predominate in the space 23 into which the magnet system 13 projects, are unable to influence the diaphragm 15.
  • Such sound waves can be sound waves from woofers which are connected to the room 23 and have not been shown in FIG. 1 for reasons of clarity of illustration.
  • the loudspeaker 10 In contrast to the conventional design of mid-range loudspeakers 10, the loudspeaker 10 according to the invention has an edge 17 which has flow channels 24 which run inside the edge 17 and the space 25 which extends between the membrane 15, the voice coil former 18 and the loudspeaker basket 14 , connects to the room 26, in which the sound pressure of the speaker 10 is emitted.
  • the flow channels 24 are arranged distributed uniformly in the edge 17 of the loudspeaker basket 14. This uniformity of the distribution of the flow channels 24 has the advantage over the non-uniform distribution of the flow channels 24 that the diaphragm 15 cannot tumble during the operation of the loudspeaker 10.
  • FIGS. 4a-c show design alternatives for the formation of flow channels 24.
  • FIG. 4a shows a very simple embodiment of a flow channel 24. However, it becomes clear in this FIG. 4a that the spaces 25 and 26 are connected to one another via the flow channel 24 and that an unimpeded air exchange between the two spaces 25, 26 is possible.
  • Figure 4b shows a flow channel 24 which is meandering. This meandering shape is achieved by a circular ring 27 which has webs 28 of different heights. At the same time, damping is achieved by the meandering design of the flow channel 24.
  • damping material 29 is arranged in region B.
  • the damping material is a gauze strip.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Details Of Audible-Bandwidth Transducers (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
EP92107233A 1991-05-18 1992-04-28 Ventilierter Lautsprecher Expired - Lifetime EP0518041B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4116342A DE4116342A1 (de) 1991-05-18 1991-05-18 Ventilierter lautsprecher
DE4116342 1991-05-18

Publications (2)

Publication Number Publication Date
EP0518041A1 EP0518041A1 (de) 1992-12-16
EP0518041B1 true EP0518041B1 (de) 1994-07-27

Family

ID=6431969

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92107233A Expired - Lifetime EP0518041B1 (de) 1991-05-18 1992-04-28 Ventilierter Lautsprecher

Country Status (5)

Country Link
EP (1) EP0518041B1 (cs)
CZ (1) CZ280864B6 (cs)
DE (2) DE4116342A1 (cs)
HU (1) HU213437B (cs)
PL (1) PL167900B1 (cs)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE830354C (de) * 1948-11-19 1952-02-04 Alexander Schaaf Lautsprecher fuer die Wiedergabe hoher Frequenzen mit druckentlasteter Membran
DK147490C (da) * 1981-02-03 1985-05-28 Jamo Hi Fi As Basrefleks-hoejttalersystem
EP0136318A1 (en) * 1983-03-02 1985-04-10 WARD, Brian Douglas Constant pressure device
DE8314251U1 (de) * 1983-05-13 1985-05-09 Standard Elektrik Lorenz Ag, 7000 Stuttgart Lautsprecherbox mit integriertem akustischem Bandpaßfilter
JP2505047B2 (ja) * 1989-06-20 1996-06-05 パイオニア株式会社 スピ―カシステム

Also Published As

Publication number Publication date
HU9201605D0 (en) 1992-08-28
DE59200316D1 (de) 1994-09-01
HUT63532A (en) 1993-08-30
CZ280864B6 (cs) 1996-04-17
CS148292A3 (en) 1992-12-16
PL167900B1 (en) 1995-12-30
PL294475A1 (en) 1993-02-22
EP0518041A1 (de) 1992-12-16
DE4116342A1 (de) 1992-11-19
HU213437B (en) 1997-06-30

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