EP0571825B1 - Lautsprechersicke mit Bedämpfungslippe - Google Patents

Lautsprechersicke mit Bedämpfungslippe Download PDF

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Publication number
EP0571825B1
EP0571825B1 EP19930107765 EP93107765A EP0571825B1 EP 0571825 B1 EP0571825 B1 EP 0571825B1 EP 19930107765 EP19930107765 EP 19930107765 EP 93107765 A EP93107765 A EP 93107765A EP 0571825 B1 EP0571825 B1 EP 0571825B1
Authority
EP
European Patent Office
Prior art keywords
bead
membrane
damping
loudspeaker
flange
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
EP19930107765
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0571825A1 (de
Inventor
Rüdiger Fleischer
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 EP0571825A1 publication Critical patent/EP0571825A1/de
Application granted granted Critical
Publication of EP0571825B1 publication Critical patent/EP0571825B1/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
    • H04R7/00—Diaphragms for electromechanical transducers; Cones
    • H04R7/16—Mounting or tensioning of diaphragms or cones
    • H04R7/18—Mounting or tensioning of diaphragms or cones at the periphery
    • H04R7/20—Securing diaphragm or cone resiliently to support by flexible material, springs, cords, or strands

Definitions

  • the invention is concerned with the optimization of speakers with circumferential rubber surround.
  • Speakers are essentially formed by a magnet system, the membrane and a speaker basket.
  • the magnet system is connected to the loudspeaker basket and the membrane is inserted into the loudspeaker basket in such a way that the voice coil, which is arranged on one side of the membrane, projects into the air gap of the magnet system.
  • the membrane When inserted into the loudspeaker basket, the membrane is connected to the edge of the loudspeaker basket by means of a so-called circumferential bead.
  • Such beads are made of elastic materials when it comes to high quality loudspeakers. Common materials that are used to manufacture beads are e.g. B. rubber, soft PVC or foamed polyurethane.
  • the bead is arched in the area that spans the distance between the membrane and the speaker basket.
  • the curvature of the corrugation to the magnet system or to the direction of radiation of the loudspeaker can be extended.
  • the region of the curvature of the bead is adjoined by circumferential flanges, one flange of which is connected to the edge of the speaker cage and the other flange is connected to the edge of the membrane.
  • the connection between the last-mentioned flange of the bead and the edge of the membrane is usually realized in such a way that the flange and the edge of the membrane overlap one another and the two components are glued to one another in the overlap area.
  • Beads of the above type have the tasks of guiding the membrane during axial movements, limiting the deflection of the membrane together with the centering membrane and, when the speaker is installed in a housing, sealing the rear part of the speaker from the radiation surface of the membrane.
  • the beads that perform the aforementioned tasks should also be designed so that they counter the deflection movements of the membrane over the entire frequency range of the speaker a uniform spring force.
  • the beads should also have a damping effect. If the diaphragm is driven by means of the voice coil, the applied sound energy in the diaphragm continues to the edge of the diaphragm and, if the damping properties of the bead are insufficient, from the edge of the diaphragm to Starting point reflected back. As a result of such reflections, standing waves can occur which severely impair the efficiency or the quality of the loudspeaker.
  • the partial vibrations of the membrane caused by the applied acoustic energy can manifest themselves as longitudinal or radial vibrations.
  • Longitudinal vibrations of the membrane are understood to mean those vibrations which form axially to the direction of movement of the driven membrane.
  • Radial vibrations of the membrane which are also referred to as bell modes, are those vibrations of the membrane that run transversely to the direction of movement of the driven membrane on its circumference. While the longitudinal modes predominantly occur at high transmission frequencies, the bell modes are increasingly recorded at low transmission frequencies.
  • the bead from soft PVC and to form the flange which is glued to the membrane so long that - before the flange merges into the curvature of the bead - a part of the flange which is not glued to the membrane covers the distance between the edge of the membrane and the edge of the speaker basket.
  • the "crinkle" which otherwise occurs at around 900 Hz is weakened and shifted to lower frequencies, the extension does the trick of the (adhesive) flange around the intermediate piece, so that the effective radiator area is reduced for a given speaker basket diameter.
  • soft PVC as a bead material
  • the use of soft PVC as a bead material is not without problems. This is due to the fact that environmental impacts occur in the production of soft PVC.
  • the bonding of soft PVC to other materials is not easy to carry out, but requires additional and therefore expensive measures.
  • One such measure is pretreatment of the adhesive seam surface.
  • this highly damping material can only be used in loudspeakers whose diaphragm deflection is low.
  • this material is unable to exert a sufficiently rapid return speed on the membrane. The latter is particularly important in the case when it is a matter of transmitting low frequencies with a large amplitude or large dynamic jumps.
  • Bead materials that are less strongly damping such as styrene-butadiene rubber or foamed polyurethane, have the disadvantage that they are less suitable for damping bell modes in comparison to the previously mentioned highly damping materials.
  • a certain improvement with regard to the damping of bell modes can be achieved with foamed polyurethane beads if these beads are covered with damping materials in the area of the bead kink.
  • the disadvantage here is that the painting over requires an additional operation which, in many cases, cannot be carried out at all or can only be carried out with considerable difficulty.
  • the invention is therefore based on the object of specifying a bead which avoids the disadvantages of the known beads by having a rapid return speed even with a large deflection of the loudspeaker diaphragm and nevertheless effectively damping bell modes.
  • the speaker surround is made of rubber and that the flange which is connected to the membrane has a circumferential damping lip which stands up on the flange surface which is connected to the edge of the membrane.
  • the formation of the bead according to the invention is based on the mechanical finding that T-shaped profiles are substantially stronger and stiffer than flat profiles with the same mass. This stiffening of the The beading edge effectively dampens the bell modes without impairing the rolling behavior of the bead itself. Therefore, according to the invention, it is also possible to equip loudspeakers with rubber surrounds without the otherwise usual buckling occurring in the frequency response. I also distinguish the beads according to the invention by their high backward speed and can therefore also be used in loudspeakers with a large diaphragm deflection.
  • the damping lip is glued to the membrane, excellent damping of bell modes can be achieved even with short lengths of the damping lip.
  • This figure shows a bead 10 in a sectional view. It can be clearly seen that this bead 10 has an approximately semicircular curvature 11 in the central region.
  • the flange 12 adjoins the left edge of this curvature 11. With this flange 12, the bead 10 is connected to the speaker basket (not shown). Closes on the right side of the arch 11 also a flange 13. This flange 13 is glued to the membrane 14 on the side 15 facing the membrane 14.
  • the damping lip 16 is led out from the side 15 of the flange 13 approximately as an extension of the curvature 11. This damping lip 16 has a length that corresponds approximately to the thickness d of the membrane 14.
  • the damping lip 16 is also glued to the side facing the membrane 14.
  • the bead 10 together with the damping lip 16 is formed in one piece from styrene-butadiene rubber.
  • styrene-butadiene rubber has been chosen only as an example.
  • the bead can also be formed from another thermoplastic rubber.

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
EP19930107765 1992-05-23 1993-05-13 Lautsprechersicke mit Bedämpfungslippe Expired - Lifetime EP0571825B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4217194 1992-05-23
DE19924217194 DE4217194A1 (de) 1992-05-23 1992-05-23 Lautsprechersicke mit Bedämpfungslippe

Publications (2)

Publication Number Publication Date
EP0571825A1 EP0571825A1 (de) 1993-12-01
EP0571825B1 true EP0571825B1 (de) 1995-01-25

Family

ID=6459635

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19930107765 Expired - Lifetime EP0571825B1 (de) 1992-05-23 1993-05-13 Lautsprechersicke mit Bedämpfungslippe

Country Status (4)

Country Link
EP (1) EP0571825B1 (cs)
CZ (1) CZ280757B6 (cs)
DE (2) DE4217194A1 (cs)
DK (1) DK0571825T3 (cs)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU608270A1 (ru) * 1976-08-23 1978-05-25 Предприятие П/Я 1705 Громкоговоритель
JPS5379525A (en) * 1976-12-23 1978-07-14 Sony Corp Compound diaphtagm for speakers
US4235302A (en) * 1977-03-15 1980-11-25 Kenkichi Tsukamoto Loudspeaker
DE3622558A1 (de) * 1986-07-04 1988-01-14 Ant Nachrichtentech Anordnung mit membran fuer einen schallwandler
DE4111748A1 (de) * 1991-04-11 1992-10-15 Nokia Deutschland Gmbh Lautsprecher mit sicke und (einbauab-) dichtung vereinigenden bauteil

Also Published As

Publication number Publication date
DE59300069D1 (de) 1995-03-09
CZ280757B6 (cs) 1996-04-17
CZ95393A3 (en) 1994-10-19
DE4217194A1 (de) 1993-11-25
DK0571825T3 (da) 1995-05-01
EP0571825A1 (de) 1993-12-01

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