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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a phase inversion
type speaker system showing a conventional example, FIG. 2 is a front view of the speaker of the
present invention, and FIG. 2 is an AA 'of FIG. FIG. 3 is a cross-sectional view of a phase inversion
type speaker system using the speaker according to the present invention, FIG. 4 is an equivalent
circuit diagram of the speaker system of FIG. 4, and FIG. . 1 ииииии Diaphragm, 2 иииииииииии Sound tube.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a speaker for use
in a phase reversal speaker system. In the conventional phase-reversal speaker system, the
speaker is attached to the front wall of the closed baffle, and a part of the front wall is provided
with a through hole or an acoustic tube of appropriate size, and the vibration of the diaphragm.
Thus, the volume change of air generated in the box is emitted as sound from the hole or the
acoustic tube. The speaker according to the present invention is characterized in that the
diaphragm l is provided with the acoustic pipe 2 communicating between the front chamber and
the rear chamber separated by the diaphragm, and the sound source is emitted with the surface
of the circuit being approximately circular. it can. In addition, if several acoustic tubes are
arranged concentrically, it is possible to use two coaxial sound sources. The speaker of the
present invention, when incorporated in a closed cabinet, becomes a phase-reversal speaker
system (FIG. 3), and has the same operation principle as a conventional phase-reversal speaker
system (FIG. 1). That is, the equivalent circuit of the phase-reversal type speaker system using the
speaker according to the present invention is as shown in FIG. 4, and from the compliance Cm2
of air in the cabinet, the mass m of air in the acoustic tube 2 and the aperture surface of the
acoustic tube The sound generated in the back chamber of the diaphragm 1 is generated at the
acoustic tube at a frequency higher than the parallel resonance by the sum of Ms and the
additional mass at the time of radiation of the acoustic tube and the area of the aperture of the
acoustic tube (= m-1-Ms) It is in reverse phase and it is in phase with the sound from the front of
the diaphragm 1 (this operation is performed. If the resonance frequency fo of Cm2 and (m + Ms)
is lower than the resonance frequency fo of the speaker itself, the bass range can be extended as
shown by the solid line in FIG.
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