(19)
(11) EP 0 576 216 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
31.08.1994 Bulletin 1994/35

(43) Date of publication A2:
29.12.1993 Bulletin 1993/52

(21) Application number: 93304780.5

(22) Date of filing: 18.06.1993
(51) International Patent Classification (IPC)5G10K 9/18
(84) Designated Contracting States:
DE FR GB

(30) Priority: 20.06.1992 JP 186138/92

(71) Applicant: STAR MICRONICS CO., LTD.
Shizuoka-shi, Shizuoka-ken 422 (JP)

(72) Inventor:
  • Suzuki, Kazushi, c/o Star Micronics Co., Ltd.
    Shizuoka-ken 442 (JP)

(74) Representative: Linn, Samuel Jonathan et al
MEWBURN ELLIS York House 23 Kingsway
London WC2B 6HP
London WC2B 6HP (GB)


(56) References cited: : 
   
       


    (54) Method of compensating for a change in sound pressure characteristic with temperature of an electoacoustic transducer


    (57) The invention provides a method of compensating for a change in sound pressure characteristic with temperature of an electroacoustic transducer utilizing the tendency of resonance frequencies (fo) and (fv) to vary with temperature. The method according to the invention is, in an electroacoustic transducer comprising a diaphragm (4) disposed within a casing (2), a resonance chamber (6) provided on the front side of the diaphragm (4), a driving source (8) provided on the back side of the diaphragm (4), the diaphragm (4) being vibrated by the driving source (8) to produce a sound to be emitted through the resonance chamber (6), characterized in that the resonance frequency (fv) of the resonance chamber (6) is set lower (fv<fo) than the resonance frequency (fo) of the diaphragm (4). According to the invention, with the resonance frequency of the resonance chamber (6) set lower than the resonance frequency of the diaphragm (4), a magnetic driving force of the driving source (8) is increased at high temperatures to compensate for a decrease in sound pressure while it is decreased at low temperatures to compensate for an increase in sound pressure, thereby compensating for a change in sound pressure characteristic with temperature.







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