(19)
(11) EP 0 467 016 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
17.06.1992 Bulletin 1992/25

(43) Date of publication A2:
22.01.1992 Bulletin 1992/04

(21) Application number: 91104052.5

(22) Date of filing: 15.03.1991
(51) International Patent Classification (IPC)5: H04R 9/02
(84) Designated Contracting States:
DE FR GB

(30) Priority: 20.07.1990 JP 193277/90
19.10.1990 JP 280773/90

(71) Applicant: PIONEER ELECTRONIC CORPORATION
Meguro-ku Tokyo 153 (JP)

(72) Inventors:
  • Jiro, c/o Kawagoe Koujou
    Ooaza Yamada, Kawagoe-shi, Saitama-ken (JP)
  • Murayama, Fumio, c/o Kawagoe Koujou
    Ooaza Yamada, Kawagoe-shi, Saitama-ken (JP)
  • Mitobe, Kunio, c/o Kawagoe Koujou
    Ooaza Yamada, Kawagoe-shi, Saitama-ken (JP)
  • Watanabe, Shuichi, c/o Kawagoe Koujou
    Ooaza Yamada, Kawagoe-shi, Saitama-ken (JP)
  • Sato, Masatosi, c/o Kawagoe Koujou
    Ooaza Yamada, Kawagoe-shi, Saitama-ken (JP)

(74) Representative: Sajda, Wolf E., Dipl.-Phys. et al
MEISSNER, BOLTE & PARTNER Widenmayerstrasse 48
D-80538 München
D-80538 München (DE)


(56) References cited: : 
   
       


    (54) Magnetic circuit for a speaker


    (57) A magnetic circuit for a speaker having a yoke (1,15) has a pole (3,16) formed on the yoke base (2,17), an annular magnet (4,19) mounted on the yoke base (2,17), and a top plate (5,18) mounted on the magnet (4,19). The periphery of the magnet (4,19) has an outwardly curved sectional shape. Peripheries of the yoke base (2,17) and the top plate (5,18) have outwardly or inwardly curved sectional shapes (2a,5a,17a,18a), respectively.






    Search report