(19)
(11) EP 1 182 907 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
18.06.2003 Bulletin 2003/25

(43) Date of publication A2:
27.02.2002 Bulletin 2002/09

(21) Application number: 01307079.2

(22) Date of filing: 20.08.2001
(51) International Patent Classification (IPC)7: H04R 31/00, H04R 9/04
(84) Designated Contracting States:
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR
Designated Extension States:
AL LT LV MK RO SI

(30) Priority: 24.08.2000 JP 2000253584

(71) Applicant: Pioneer Corporation
Meguro-ku, Tokyo (JP)

(72) Inventors:
  • Oyaba, Takashi, c/o Pioneer Corporation
    Tokorozawa-shi, Saitama (JP)
  • Terauchi, Shouichiro, c/o Pioneer Corporation
    Tokorozawa-shi, Saitama (JP)
  • Ishizuki, Tomonori, c/o Pioneer Corporation
    Tokorozawa-shi, Saitama (JP)
  • Hanayama, Katsutoki, c/o Pioneer Corporation
    Tokorozawa-shi, Saitama (JP)
  • Kato, Ryuichi, c/o Pioneer Corporation
    Tokorozawa-shi, Saitama (JP)

(74) Representative: Haley, Stephen 
Gill Jennings & Every, Broadgate House, 7 Eldon Street
London EC2M 7LH
London EC2M 7LH (GB)

   


(54) Electroacoustic transducer


(57) Conductor pattern portions CLa1 and CLb1 are printed on a center portion of a polymeric resin film, and the center portion is folded and then bonded, thereby forming a diaphragm 21 which integrally has a flat plate-like portion 23 having the conductor pattern portions CLa1 and CLb1, and first and second vibrating sections 21a and 21b having a curved shape. A magnet 17 and yokes 18 and 19 form a magnetic circuit and a magnetic gap MG. The flat plate-like portion 23 is inserted into the magnetic gap MG. The whole diaphragm 21 is supported by a support member 20 in a floating state. In this structure, when an audio signal is supplied to the conductor pattern portions CLa1 and CLb1, the flat plate-like portion 23 is vibrated in a direction H by dynamic force generated by the magnetic field in the magnetic gap MG, and currentin the conductor pattern portions CLa1 and CLb1 which are inserted into the magnetic gap MG, and also the first and second vibrating sections 21a and 21b are vibrated in the direction H, so that a reproduced sound of excellent high-frequency characteristics is released.






Search report