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JPS58114693

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DESCRIPTION JPS58114693
[0001]
The present invention relates to a horn speaker in which an acoustic transformer is configured in
an evaluation manner by narrowing the opening area of a horn smaller than the area of a
diaphragm. A conventional horn speaker of this type will be described with reference to FIG. 1 is
a magnet, 2 扛 top plate, BFi plate with center ball, 4 is a horn, 5 is a diaphragm, 6 company
voice coils, 7 is an equalizer, and an empty N8 between the equalizer 7 and the diaphragm 5 is
thin air Form a layer. FIG. 2 is a diagram showing the equivalent circuit, 9 is the mechanical
impedance (2 m) of the vibration system, 10 is the reflection impedance (Z j b) by the horn load,
11 is M f, 12 d Of. Now, t is the distance between the diaphragm and the equalizer, day is the
area of the diaphragm, ρ is the density of the medium, 0 is the sound in the medium =, FC is the
sky 18! Assuming that the resonance frequency of the air layer at 8 is expressed by the following
equation. ρ · C! In the vicinity of -8ρl · 8Mf 鱗 and FC, the acoustic energy consumed is reduced
directly at the radiation impedance z, and the reproduction efficiency is reduced. In order to solve
this problem, the present invention provides an acoustic transformer with a constraint such that
the area of the −i aperture of the horn is smaller than the area of the diaphragm to form an
acoustic transformer. In a horn speaker in which an equalizer is disposed between a mouth and a
diaphragm, a thin film is provided at the inlet of the equalizer or at the Fi-Taguchi, and in the
space formed between the thin film and the diaphragm It is intended to extend the regeneration
level in the high frequency band by setting the amount of the gas above the low level ye 11 -use
band by filling the gas in an intermittent manner. 6i In the embodiment of the present invention,
the right half is provided with a thin film 15 at the inlet of the equalizer 7 to fill the air gap 8
with a gas of high sound velocity, and the left half is provided with the thin film 16 at the outlet
The case where it is provided and it is filled with gas with a high sound speed in the whole space
formed between the diaphragm 5 and the equalizer 7 is shown, respectively. In the figure,
reference numerals 1 to 8 indicate the same as in FIG. The thin film 15 is formed of a metal foil
02-05-2019
1
or a plastic film. Hydrogen (12701'R7'seO), helium (970ya / 1aC), etc. are used as a fastsounding gas. Since the speed of sound in dry air is 550 m / IgC, the speed of sound in these
gases reaches 3 to 4 times the speed of sound in air. FIG. 4 is a graph comparing sound pressure
frequency characteristics of the horn speaker of the present invention and the conventional horn
speaker of FIG. As shown in the same graph.
It can be seen that the horn speaker of the present invention is superior in sound pressure
characteristics to the conventional horn speaker b in the high frequency band. As described
above, according to the present invention, in the ho / speaker, the reproduction level in the high
frequency band is extended by filling the space between the diaphragm and the horn I 71 with
the gas having a high sound velocity. Have.
[0002]
Brief description of the drawings
[0003]
Figure 1 Figure 2: Main part of the conventional ho / speaker Figure 2: Mechanical equivalent
circuit diagram of the horn speaker in Figure 1 Figure 3 Figure: Main part of the horn speaker of
the present invention Figure 4: Graph comparing the sound pressure frequency characteristics of
the horn speaker of FIG. 1 and the horn speaker of FIG. 3 [symbol] 1 ... magnet 2 ... top plate 5:
plate with center ball 4 · · Horn, 5 · · · diaphragm, 6 · · · voice coil, 7 · · · · · · · · · · · · · · · · · · · · · · 13
thin film agent patent attorney Masashi Shibasaki □: ,,,, , 1, 1 Fig. 1 Fig. 2
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