(19)
(11) EP 1 128 705 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
02.01.2003 Bulletin 2003/01

(43) Date of publication A2:
29.08.2001 Bulletin 2001/35

(21) Application number: 01301583.9

(22) Date of filing: 22.02.2001
(51) International Patent Classification (IPC)7: H04R 9/04, H04R 9/02
(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: 25.02.2000 JP 2000050197
25.02.2000 JP 2000050198

(71) Applicant: STAR MICRONICS CO., LTD.
Shizuoka-shi, Shizuoka (JP)

(72) Inventors:
  • Sugiyama, Shigeru
    Shizuoka-shi, Shizuoka (JP)
  • Fujinama, Naohiro
    Shizuoka-shi, Shizuoka (JP)
  • Kitamura, Hajime
    Shizuoka-shi, Shizuoka (JP)
  • Imahori, Yoshio
    Shizuoka-shi, Shizuoka (JP)
  • Yamashima, Hitoshi
    Shizuoka-shi, Shizuoka (JP)
  • Kushida, Masami
    Shizuoka-shi, Shizuoka (JP)
  • Kubota, Hisashi
    Shizuoka-shi, Shizuoka (JP)

(74) Representative: Skone James, Robert Edmund 
GILL JENNINGS & EVERY Broadgate House 7 Eldon Street
London EC2M 7LH
London EC2M 7LH (GB)

   


(54) Speaker


(57) By forming a flange portion 16a1 protruding inward in the radial direction at an upper end portion 16a of a voice coil 16, a coiling sectional shape of the voice coil 16 is set to a L-shape. And, the upper end portion 16a of this voice coil 16 is bonded and fixed to a central flat portion 12b of a diaphragm 12. Hereby, by only increasing slightly the weight of the usual voice coil having an I-shaped coiling section, the large bonding area can be obtained between the voice coil 16 and the diaphragm 12, so that separation of the voice coil 16 can be prevented. Further, since other portions of the voice coil 16 than the upper end portion 16a thereof have the usual coil thickness, it is not necessary to expand the width of a cylindrical magnetic gap G in a magnetic circuit unit 18, whereby it is prevented that electroacoustic conversion efficiency of a speaker 10 lowers.






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