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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view showing a conventional horn
speaker, FIG. 2 is a sectional view showing one embodiment of the horn speaker of the present
invention, FIG. 3 is an enlarged sectional view of the same portion, FIG. 4 is a characteristic
diagram showing the relationship between the temperature rise and the input of the voice coil of
the horn speaker of the prior art and the present invention, and FIG. 5 is a characteristic diagram
comparing the sound pressure frequency characteristics. 15 'и и и и и Magnetic circuit, 24 и и и и и и и
dome-shaped diaphragm, 25 и и и и voice coil, 26 и и и и и и и и и и и и и и и magnetic gap. 27 иии и и и Magnetic
fluid, 29 и и и и и и и и Horn.
DETAILED DESCRIPTION OF THE INVENTION In the present invention, magnetic gaps are filled
with magnetic fluid to improve resistance to human power and to flatten sound pressure
frequency characteristics and further reduce harmonics to achieve good Hi-Fi regeneration. It
relates to a horn speaker that has been made possible. Recently, in order to talk about the
improvement of the input resistance as a speaker, a magnetic fluid is injected into the magnetic
gap in which the voice coil is embedded, and the heat generated in the voice coil is dissipated
through the magnetic circuit. I put it in. This concept is applied to the horn speaker, and the
conventional horn speaker is configured as shown in FIG. That is, a plate 2 having a center pole 1
and a ring-shaped magnet 3. A horn throat 6 is provided at the center of a center pole 1 and a
plate 2 of a magnetic circuit 6 constituted by a ring-shaped upper plate 4, and several radiallyadjacent open sound portions 7 are concentrically arranged on the center pole 1. And the domeshaped diaphragm 10 is attached to the upper side of the magnetic circuit 6 through the edge
fixing ring 9, and the magnetic gap of the magnetic circuit 5 is attached to the dome-shaped
diaphragm 10. The voice coil 12 fitted to 11 is coupled, the cover 13 is attached to the magnetic
circuit 6 on the dome-shaped diaphragm 1 o, and the horn 14 continuous with the horn throat 6
is coupled to the lower surface of the magnetic circuit 6. In such a horn speaker, a thin wire is
used for the voice coil 12 in order to enhance the acoustic conversion efficiency, so when an
input is applied, the voice coilter 312 generates heat and the temperature rises significantly, and
the heat generation occurs. The sound pressure frequency characteristic has a peak in the high
region as shown by the broken line in FIG. 6 and the second harmonic distortion is often shown
in the low region also by the broken line in FIG. The present invention having the abovementioned drawbacks will eliminate the above-mentioned conventional drawbacks. An
embodiment of the present invention will be described below with reference to FIGS. In FIG. 2,
reference numeral 15 denotes a magnetic circuit, and the magnetic circuit 16 is constituted by a
plate 17 having a center pole 16, a ring-shaped magnet 18, and a ring-shaped upper plate 19; At
the center of the plate 17 is provided a through hole 20 to be a horn throat. The equalizer pole
21 whose upper surface of the upper surface of the center pole 16 is spherical is coupled to the
equalizer 21. Concentric to the equalizer 21, the open sound passing portion 22 whose diameter
is smaller toward the lower end of the pache is announced. There are 4 pieces.
Further, a dome-shaped diaphragm 24 is disposed on the upper surface of the magnetic circuit
16 via an edge fixing ring 23, and a voice coil 26 is coupled to the dome-shaped diaphragm 24.
The voice coil 25 is connected to the magnetic gap 26. I'm stuck. Moreover, the magnetic gap 26
is filled with the magnetic fluid 27. The magnetic fluid 27 is, for example, one obtained by mixing
the surface of fine particles of F6xQ4 of 100 to 200 ? in a solvent such as ester, and changing
the ratio of the solvent according to the purpose to change the viscosity of the magnetic fluid 27
It can be chosen and used. A cover 28 is placed on the upper surface of the dome-shaped
diaphragm 24, and a horn 29 which is continuous with the through hole 20 of the magnetic
circuit 16 to be a horn throat is coupled downward of the magnetic circuit 15. With such a
configuration, when an input is applied to the voice coil 26, the voice coil 25 generates heat, but
the temperature rise due to this heat generation increases with the increase of the input as
shown in FIG. The temperature is rapidly dissipated to the magnetic circuit 15 by the magnetic
fluid 27, and the temperature rise is extremely small as shown by the solid line as compared to
the temperature rise of the conventional speaker shown by the broken line. According to the
experiment, as shown in FIG. 4, the burnout temperature ?2 of the voice coil of the horn speaker
containing the magnetic fluid is ?2 or ?1 while the input P1 at which the voice coil without the
magnetic fluid burns at ?1. Therefore, the input P2 at which the voice coil of the magnetic fluidfilled horn speaker has a breakdown temperature ?1 is P2> 2P +, and the input resistance is at
least twice. Also, as shown by the sound pressure frequency characteristics in FIG. 6, the horn
speaker with magnetic fluid attenuates the peak of the high region as shown by the solid line,
while the sound pressure of the low region rises and is flat as a whole. It is possible to obtain
frequency characteristics. Furthermore, the second harmonic can be reduced as shown by the
solid line in the low band due to the braking effect. As described above, since the horn speaker
according to the present invention is configured, the heat generated in the voice coil is dissipated
extremely rapidly, and the heat resistance is rapidly improved to significantly improve the input
resistance. In addition, the sound pressure frequency characteristics can be flat and have less
harmonic distortion (i-Fi regeneration can be performed), which is of great practical value.
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