(19)
(11)EP 2 424 272 A3

(12)EUROPEAN PATENT APPLICATION

(88)Date of publication A3:
18.09.2013 Bulletin 2013/38

(43)Date of publication A2:
29.02.2012 Bulletin 2012/09

(21)Application number: 11165216.0

(22)Date of filing:  09.05.2011
(51)Int. Cl.: 
H04R 9/02  (2006.01)
(84)Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated Extension States:
BA ME

(30)Priority: 25.08.2010 US 868116

(71)Applicant: HARMAN INTERNATIONAL INDUSTRIES, INCORPORATED
Northridge California 91329 (US)

(72)Inventor:
  • Danovi, Benny Lee
    Ypsilanti, MI 48197 (US)

(74)Representative: Grünecker, Kinkeldey, Stockmair & Schwanhäusser 
Leopoldstrasse 4
80802 München
80802 München (DE)

  


(54)Split magnet loudspeaker


(57) A loudspeaker can provide magnetic flux from polarity-aligned split magnets to drive voice coils and generate sound. The loudspeaker may have reduced stray magnetic fields and a BL curve with symmetric and linear characteristics. The loudspeaker can include a core, split magnets, a magnet housing, a core cap, and a voice coil gap formed between the magnet housing and the core cap. Magnetic flux produced by the split magnets may be combined, directed, and/or concentrated by the core cap and magnet housing within the voice coil gap. At least portions of a voice coil may be positioned within the voice coil gap and a diaphragm may be coupled to the voice coil. A bucking magnet assembly may contain a magnetic flux of the magnet structure to further improve performance. The bucking magnet assembly may include split magnets with an aligned polarity that is opposite the polarity of the magnet structure.