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JPS54120930

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DESCRIPTION JPS54120930
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a conventional horn
speaker, FIG. 2 is a diagram showing the change of the area of the horn speaker, and FIG. 3 is the
sound pressure in the slit of the equalizer of the conventional horn speaker FIG. 4 shows the
distribution, FIG. 4 shows the sound pressure frequency characteristic of the conventional horn
speaker, FIG. 5 shows a sectional view of the horn speaker in one embodiment of the present
invention, and FIG. FIG. 7, FIG. 7 are sound pressure frequency characteristics .quadrature. Of the
horn speaker of the present invention. 1 ...... diaphragm 4 ...... voice coil, 5-song clamp ring, 6 ......
plate, 7 ...... magnets 14, 14 ', 14 ? ? иииииииииииииииииииииииииииииии Equalizer. FIG. 4? ? ?-(H, r) mlj. ???
?????????
DETAILED DESCRIPTION OF THE INVENTION The present invention is directed to flattening the
sound pressure frequency characteristics of a horn speaker. FIG. 1 shows a cross-sectional view
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, 5 is a clamp ring for supporting the diaphragm 1, 6 is a plate, 7 is an annular magnet,
8 is a center pole, 9 Is a space between the diaphragm 1 and the equalizer 2 and the sound from
the back of the dome of the diaphragm 1 is divided by each of the equalizers 2 r-/ ':) I by 2 ░ lit
10, 10' , 10 "are phase-equalized and radiated by the horn 3 into space. In the conventional horn
speaker shown in FIG. 1, it is assumed that the slit area of the equalizer 2 is an extension of the
horn and the horn 3 is as far as the space 9 between the diaphragm 1 and the equalizer 2 as
shown in FIG. It was designed thinking. That is, in FIG. 2, assuming that the horn is the exbonen 7
dial horn and its cutoff frequency fc, the area of the horn of length X from the horn throat
portion is 3, == 3, enll! (Here m-, wfcc is the speed of sound, So is the horn throat area), m is a
coefficient that determines the spread of the horn, and the slit area is also calculated for the
equalizer section 11 using this coefficient. That is, assuming that the slit length is l, the area S1 at
the slit outlet is Sl-51-8o, and from this result, the area of each slit 1010'1o is -13 ░ so that the
sum of the areas is 11 I have designed an equalizer. However, when the cutoff frequency of the
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horn is low and the spread coefficient m of the horn is small, the change in area near the horn
throat is also small and close to a cylindrical tube. Therefore, for example, when taking out the
slit 10 ? ? and looking at the change in area, as shown in FIG. 3, when the sound pressure
distribution in the cylindrical tube 12 is obtained and the sound pressure distribution in the slit is
measured, the same standing waves 13 as in the case of the cylindrical acoustic tube It turned
out that it happened. This is because when the area of each slit is combined, the equalizer and
the horn appear to be connected smoothly as shown in FIG. 2, but in actual operation, the state
changes at the slit exit and reflection of the sound wave occurs It is Fig. 4 df. It is a measurement
result of the sound pressure characteristic of a -330 Hz horn speaker, and the influence of the
standing wave in the above-mentioned slit appears as 2, sK, sK, 7.6KH2 (7) valley and tail.
Assuming that the basic frequency is 2.6 KHz, the frequency of 5 KHz is doubled and the
frequency of 7.5 KHz is tripled, and the standing wave in the slit is also generated at the same
frequency.
The present invention eliminates the above-mentioned conventional defects, and in the following,
one embodiment of the present invention will be described with reference to FIG. Description will
be made with reference to the drawings. In FIG. 5, 1 (d is a dome-shaped diaphragm, and the
edge portion of the dome-shaped vibration & 1 is supported by the clamp 6. A hemispherical
equalizer 15 is disposed at the back of the dome portion of the dome-shaped diaphragm 1, and
the equalizer 15 is formed with Surin's 14, 14 ', 14 ". The sound produced by the vibration of the
diaphragm 1 passes through the slits 14.14 'and 14 "of the equalizer 15 and is emitted from the
horn 3. The sum of the areas of the equalizers 14.14 'and 14 "of the horn speaker according to
the present invention is 0.7 to 0.8 times the conventional slit length P, as shown in FIG. Until the
part), the spread coefficient m 'becomes larger than the spread coefficient m of the horn 3, that
is, S2 = SO6m' (0, 7 to o, s) n, and the remaining part 17 has a horn throat It is connected
smoothly. Thus, in the horn speaker of the present invention, the area of the slits 14.14 'and 14
"of the 1' riser 15 is changed so as to have a spread coefficient larger than that of the 5 horn, It is
not a conventional cylindrical sound tube, and does not generate a standing wave in the slit. FIG.
7 shows the sound pressure frequency characteristics of the embodiment of the present
invention in which the spread coefficient m 'of the slit area is 5 times f-330 Hz and the spread
coefficient m' of the slit area, and the valley of the sound pressure due to the standing wave is
Flat force sound pressure frequency characteristics can be obtained.
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