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(11) | EP 0 576 216 A3 |
(12) | EUROPEAN PATENT APPLICATION |
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(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. |