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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a conventional horn
speaker, FIG. 2 is a schematic view showing the area relationship of the horn speaker equalizer
and the horn, and FIG. Fig. 4 is a graph showing the sound pressure frequency characteristics of
the horn speaker, Fig. 5 is a cross-sectional view of the horn speaker according to an
embodiment of the present invention, and Fig. 6 is the horn speaker FIG. 1 is a cross-sectional
view of an equalizer according to another embodiment of the present invention. 1 · · · · · · · · · · · · · ·
· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 9 9 9 ', 9 "... Slit, 12, 14
... Pore, 13 ... Porous material. Enjoy twlz-ir'm □,-
DETAILED DESCRIPTION OF THE INVENTION The present invention is directed to flattening the
sound pressure characteristics of a horn speaker. FIG. 1 shows a cross section of a conventional
horn speaker. In FIG. 1, 1 is a diaphragm, 2 is an equalizer, 3 is a horn, 4 is a voice coil, 6 is a
diaphragm fixed \, a ring, 6 is a blade, 7 is a magnet, 8 is a 0 to n pole, 7 ′ ′ from the back of
the dome of diaphragm 1? The sound coming out of 22 is radiated to space through each of the
Surin of the equalizer 2) 9.9 ', 9 "and the horn 3. At the connecting portion 10 between the horn
3 and the outlet of the equalizer 2, the sum of the areas of the respective sides of the equalizer 2)
9, 9 ° and 9 ′ ′ is as shown in FIG. It is designed to be connected smoothly. That is, assuming
that the horn 3 is an exponential horn in FIG. 1 and its cutoff frequency is fc, it is known that the
horn area S of length X from the horn throat portion! Becomes Sx-Sx-8 oCπfc (here, m 2 □ C-· · ·
velocity of sound, So · · · · · · · · · · slot is the coefficient which determines the spread of the horn
The slit area is also calculated using this coefficient for ', 9'. In FIG. 2, the area from the horn
throat to the length X □) is the equalizer section, and the area S1 at this equalizer exit 3 is S □ =
SoCm 81 horn length x2. ! 2. It is generally designed using the same spreading factor m to be sO
cm (xl + x 2). However, when the cutoff frequency f of the horn is low and the spread coefficient
m of the horn is small, the change in area near the throat of the horn is also small and close to a
cylindrical tube. Accordingly, the area change of each slit of the equalizer 2 is also almost
cylindrical as shown in FIG. 3, and when the sound pressure distribution in the slit is measured, a
standing wave 11 similar to a circular acoustic pipe is generated. is there. This indicates that the
equalizer 2 and the horn 3 are smoothly coupled as shown in FIG. 2 when the area of each slit is
combined, but the actual operation shows that the reflection of the sound wave is generated at
this coupled portion 10 . Fig. 4 shows the sound pressure characteristics of a medium frequency
horn speaker with a cutoff frequency of 330 Hz. The effect on the shadow of the standing wave
in the above-mentioned Ij) appears as a valley of 2, 5x tlz, 5 KIIZ, and 7.5 KIIZ. Sound pressure
characteristics flatter force is inhibited. Assuming that 26 KH2 is one-fourth base frequency, 5
KHz is doubled and 7.6 KHz is tripled, and a standing wave in the slit is also generated at the
same frequency.
The present invention eliminates the above-mentioned conventional drawbacks, and one
embodiment of the present invention will be described below with the same reference numerals
as in FIG. In FIG. 5, reference numeral 12 denotes pores which communicate between the
respective slits 9, 9 'and 9' in the vicinity of the outlet of the slits 9, 9 'and 9'. The sound from the
diaphragm 1 is radiated from the horn 3 through the slits 9.9 °, 9 ′ ′ of the equalizer 2, but
in the present invention, the equalizer 2 is provided with the pores 12. By providing the holes 12,
it is possible to eliminate the reflection of the sound wave at the connecting portion 10 of the
equalizer 2 and the horn 3 which has conventionally occurred in the horn. That is, since there are
pores 12 penetrating near the exit of the slits 9, 9 °, 9 ′ ′, each slit) 9.9 ′. 9 "sound wave
mixes with the sound wave of the adjacent slit little by little, and is accompanied by a rapid
change in state at the slit outlet) 292. The reflection of the sound wave is eliminated, and the
horn 3 and the smooth sound wave-46-J can be coupled. FIG. 6 shows the sound pressure
characteristics of the horn speaker according to the present invention, wherein the valleys of the
sound pressure of 2, 5 K [lZ, sxtlz, 7, 5 x flz in the prior art are eliminated and the sound pressure
characteristics become flat and flat. FIG. 7 shows another embodiment of the present invention,
in which a porous material such as resin or aluminum is used as the material of the equalizer 2. If
the size of the pores of the porous material 13 is appropriately selected, a through hole can not
be formed near the entrance of the thick equalizer with a large thickness (slit interval), and a slit
9 ° 9 ′ near the outlet of the thin equalizer. A pore 14 communicating 9 ′ ′ is formed. The
present invention is configured as described above, and since the slits are communicated with
each other through the pores in the vicinity of the outlet of the slit, a standing wave is not
generated in the slit and the flat sound pressure frequency characteristic is It has the obtained
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