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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a conventional
electromagnetic electro-acoustic transducer, FIG. 2 is a graph showing frequency characteristics
of output sound pressure, and FIG. 3 is a cross-sectional view showing one embodiment of the
present invention. FIG. 4 is an output sound pressure frequency characteristic diagram. 1 ...
magnetic core, 2 ... excitation coil, 3 ... permanent magnet, 4 ... case, 5 ... diaphragm, 7.7a, 7b ...
acoustic diaphragm.
[Detailed description of the invention] (1) jJ two J: I Al the?
? ? и и и и The present invention
relates to an electromagnetic type electroacoustic transducer with an acoustic resonator, which
resonator? * Bamboo echo resonance by dividing it into am? While increasing the output by
generating several lj pieces and setting pigeons of the exchange resonance in a harmonic
relationship of the input signal, widening of the band is obtained by selecting the resonance
frequency range. It is to try. A structural cross-sectional view of a conventional electromagnetic
electroacoustic transducer is shown in FIG. 1-in terms of construction, a resonator is attached to
a commonly used electromagnetic earphone. (A ? is a magnetic core made of a magnetic
material, around which an exciting coil (2) is wound, and on the outside, a permanent m6ta + is
disposed, and these are housed in a case (4). (5) is a diaphragm made of a magnetic material
disposed opposite to the heart (1) at a constant distance, and is held by the case (4). (6) there is a
cap C to form an acoustic resonator tW, and a vibrating plate + 51? As you remember, it is
supported by the case (4). Fig. 2 shows the conventional electricity! In this characteristic showing
the output pressure frequency characteristic of il type wl air pressure converter, there are two
resonance points (Al, (Bl exists, one of which is the vague machine of the diaphragm (5) (2)
Resonant frequency f of 1 Yamano O island 1 needle thread. The other one is the resonance
frequency fK> by the acoustic resonator (6). The present invention is an improvement of this, and
an embodiment thereof will be described below with reference to the drawings. FIG. 3 shows a
cross-sectional view of the structure of the electromagnetic type electroacoustic transducer
according to the present invention, and (1) to (5) are the same as the conventional one. The
resonator cap shown by (7) is divided into two acoustic resonators (7 &) (7b) unlike the
conventional one. FIG. 4 shows the output pressure-pressure frequency characteristics of the
electromagnetic electroacoustic transducer of the present invention, but the mechanical
resonance point and resonance of the diaphragm i6) are obtained by dividing into resonator (7)
? 1 [?-. 81! A resonance point (Bn) corresponding to the number of minutes 171 of 171 is
generated. In FIG. 4, two resonance points (BIMB *) and the corresponding resonance mfBt
numbers f and f are shown. The resonance frequency fr ?? of the resonance point (Bn) by the
plurality of resonators (7) K, and the resonance frequency value f of the mechanical resonance
point IAI. In consultation with the multiple relation of Io, the high-branched part of Io resonates
with fn and conversion efficiency improves. ???? ???? If set in a wide range, it is
possible to give wide-band frequency characteristics. (3) 10 (Month 1 degree i, According to the
present invention, by dividing the resonator into a plurality of resonators, resonance fn can be
made according to the number of structural machine resonances f0 of the diaphragm and the
number of resonators, and fn can be processed.
If it is set to the debt relation of, the high-wave component of fo is f s? It is possible to improve
the conversion efficiency, and by setting fo and tn wide, there is an advantage that high
frequency characteristics can be obtained. Brief description of 4 and 11i surface: Fig. 1 is a crosssectional view of a conventional electric 1111 m l l Ic sound-wave conversion, Fig. 82 is an
output sound pressure frequency characteristic diagram, and Fig. 5 is an example of the present
invention. FIG. 4 is a characteristic view of the output sound pressure m-wave value of the pipe
shown in FIG. (1) иии Magnetic core, +2) и и и Excitation coil, +3) и Permanent magnet, 141 и и и и и и и и и
Shake plate, +71 (7a, 7b) и и и и и и acoustic resonance ? agent Morimoto Satoshi Hiro (4) 1 (jt) f
Figure 2 Figure 2 ? ? tile 43! "Tsu 12 Takimaki Fig. 3 Fig. 4 d'T" ? 5 B, B. ? 1t, jt. 72 pairs of
lines 1 (J: j ,. One 639S agent Yoshihiro Morimoto
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