EP0281774A2 - Haut-parleur - Google Patents

Haut-parleur Download PDF

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Publication number
EP0281774A2
EP0281774A2 EP88101866A EP88101866A EP0281774A2 EP 0281774 A2 EP0281774 A2 EP 0281774A2 EP 88101866 A EP88101866 A EP 88101866A EP 88101866 A EP88101866 A EP 88101866A EP 0281774 A2 EP0281774 A2 EP 0281774A2
Authority
EP
European Patent Office
Prior art keywords
membrane
drive cone
loudspeaker
flat membrane
cone
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Withdrawn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
EP88101866A
Other languages
German (de)
English (en)
Other versions
EP0281774A3 (fr
Inventor
Helmut Caus
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.)
Blaupunkt Werke GmbH
Original Assignee
Blaupunkt Werke 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 Blaupunkt Werke GmbH filed Critical Blaupunkt Werke GmbH
Publication of EP0281774A2 publication Critical patent/EP0281774A2/fr
Publication of EP0281774A3 publication Critical patent/EP0281774A3/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Withdrawn legal-status Critical Current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
    • H04R7/00—Diaphragms for electromechanical transducers; Cones
    • H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
    • H04R7/04—Plane diaphragms
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/06—Loudspeakers

Definitions

  • the invention relates to a loudspeaker according to the preamble of claim 1.
  • a loudspeaker with a rigid flat membrane and a voice coil arranged in an annular gap of a magnet system
  • the rotationally symmetrical drive cone is fastened to the flat membrane in the region of a circular line that is rotationally symmetrical to the loudspeaker axis. This forces a circular line of vibrations on the membrane.
  • the flat membrane consisting of an upper cover plate, a lower cover plate and an intermediate layer that connects them, optionally with a honeycomb shape, has natural frequencies that are inharmoniously distributed and lead to unpleasant discoloration of the sound image in the mid-high range.
  • the invention has for its object to reduce the sound discoloration caused by natural frequencies of the flat membrane.
  • the advantages achieved by the invention are, in particular, that due to the design of the drive cone, the natural frequencies of the flat membrane are damped more, which results in a reduction in the change in frequency response impairing the sound pattern in the mid-high range.
  • the loudspeaker shown in FIG. 1 essentially contains, in a manner known per se, a magnet system 1, a loudspeaker basket 2 attached to it, a rigid, planar flat membrane 3, the outer edge of which is fastened to the loudspeaker basket via a bead-shaped ring 4 made of highly elastic material, a voice coil 7 arranged in the annular gap 5 of the magnet system 1 on a cylindrical coil support 6 and a centering membrane 8 having a plurality of circumferential beads and fastened to the coil body 6 and to the loudspeaker basket 2.
  • the flat membrane 3 is not driven by the voice coil 7 in a manner known per se via a rotationally symmetrical drive cone, but via a non-rotationally symmetrical one to the loudspeaker axis formed drive cone 9.
  • the drive cone 9 has at its narrow end facing the coil carrier 6 a circular opening 10 in which the coil body 6 is fastened by means of adhesive.
  • the drive cone 9 has a circumferential flange 11 which bears against the membrane 3 and is glued to it.
  • the drive cone 9a is designed such that its conic sections perpendicular to the axis of rotation pass from a circle at its narrow end into an ellipse or into an oval at its wide end.
  • its conic sections perpendicular to the axis of rotation change from a circle at its narrow end to a rounded triangle at its wide end.
  • the adhesive connection between the drive cone 9, 9a, 9b and the flat membrane 3 stabilizes the membrane 3 along this line. All points of this line move in accordance with the driving force which is transmitted from the voice coil 7 via the driving cone 9, 9a, 9b to the flat membrane 3.
  • This line thus represents a forced oscillation node line for natural vibrations of the flat membrane, whereby the natural frequencies of the flat membrane 3 are damped more.
  • the damping achieved is not limited to circular flat membranes.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
EP19880101866 1987-03-11 1988-02-09 Haut-parleur Withdrawn EP0281774A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3707741 1987-03-11
DE19873707741 DE3707741A1 (de) 1987-03-11 1987-03-11 Lautsprecher

Publications (2)

Publication Number Publication Date
EP0281774A2 true EP0281774A2 (fr) 1988-09-14
EP0281774A3 EP0281774A3 (fr) 1990-12-27

Family

ID=6322742

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19880101866 Withdrawn EP0281774A3 (fr) 1987-03-11 1988-02-09 Haut-parleur

Country Status (3)

Country Link
EP (1) EP0281774A3 (fr)
JP (1) JPS63236499A (fr)
DE (1) DE3707741A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0914020A3 (fr) * 1997-10-30 2004-09-22 Harman Audio Electronic Systems GmbH Haut-parleur
US7916878B2 (en) 2004-04-16 2011-03-29 New Transducers Limited Acoustic device and method of making acoustic device

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0243894A (ja) * 1988-08-03 1990-02-14 Matsushita Electric Ind Co Ltd スピーカ
JP4576991B2 (ja) * 2004-11-22 2010-11-10 パナソニック株式会社 振動板とそれを用いたスピーカ
DE102006035010A1 (de) * 2006-07-28 2008-02-07 Siemens Ag Flächenlautsprecher mit einer Schwingspule

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1122698A (en) * 1966-05-03 1968-08-07 Nippon Musical Instruments Mfg Loudspeaker with asymmetrically shaped diaphragm
JPS5730500A (en) * 1980-07-30 1982-02-18 Pioneer Electronic Corp Plane speaker
JPS5783995A (en) * 1980-11-11 1982-05-26 Matsushita Electric Ind Co Ltd Speaker

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0914020A3 (fr) * 1997-10-30 2004-09-22 Harman Audio Electronic Systems GmbH Haut-parleur
US7916878B2 (en) 2004-04-16 2011-03-29 New Transducers Limited Acoustic device and method of making acoustic device

Also Published As

Publication number Publication date
EP0281774A3 (fr) 1990-12-27
JPS63236499A (ja) 1988-10-03
DE3707741A1 (de) 1988-09-22

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