(19)
(11) EP 0 531 998 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
16.02.1994 Bulletin 1994/07

(43) Date of publication A2:
17.03.1993 Bulletin 1993/11

(21) Application number: 92115503.2

(22) Date of filing: 10.09.1992
(51) International Patent Classification (IPC)5: H04R 1/28, H04R 1/02
(84) Designated Contracting States:
DE DK FR GB IT NL

(30) Priority: 11.09.1991 US 757765
09.12.1991 JP 108888/91 U

(71) Applicant: N.P.L. LTD.
Minato-ku, Tokyo (JP)

(72) Inventor:
  • Yamada-Scriba, Teppi
    Minato-ku, Tokyo (JP)

(74) Representative: VOSSIUS & PARTNER 
Postfach 86 07 67
81634 München
81634 München (DE)


(56) References cited: : 
   
       


    (54) Speaker unit and covering structure therefor


    (57) Disclosed is a speaker unit casing structure including a speaker unit support of a high-rigid material. To prevent radiation of the resonance sound from the rigid parts of the speaker system, the high-rigid material parts of the speaker unit and the speaker unit support are covered with a sound absorbing material (3a), and the covering of the sound absorbing material is covered with a sheet (3b) of sound barrier material which is characteristic of an increased acoustical loss.






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