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JPS56111395

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DESCRIPTION JPS56111395
The present invention relates to a speaker having a horn-shaped speaker annular magnetic gap, a
voice coil positioned in the magnetic gap, and a diaphragm having a diameter substantially equal
to the diameter of the voice coil. A ho-shaped speaker characterized in that the front resonance
diaphragm diameter and the cutoff frequency f0 of the same system are lower than the lowest
resonance frequency f0 of the vibration system.
2, the scope of claims
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a horn-type
speaker that enables efficient electro-acoustic conversion that reduces harmonic distortion. In the
conventional horn-type speaker, as shown in FIG. 1, a tone transformer 7 is provided between the
throat 3 of the horn and the diaphragm 4, and the diaphragm area (S, However, if the variation is
increased, the volume of the acoustic transformer 7 (diaphragm area S, X between the X
diaphragm and the horn Nh) is increased, and the air stiffness is decreased. Therefore, there is a
disadvantage that the high frequency band limit frequency (fb) becomes low. Furthermore, in the
conventional horn-type speaker, the phase pressure interference 2 is disturbed due to phase
interference if the distance from each position of the diaphragm 4 to the throat 5 of the horn is
not approximately equal. Need. The phase equalizer 2 is a component that constitutes the
acoustic transformer 7. In order to increase the air stiffness of the acoustic transformer 7 part, it
is sufficient to reduce the gap between the diaphragm 4 and the throat 3 of the horn, but there is
a limit because the diaphragm 4 vibrates (% coming h = o, 1 ~ About 0.3). A phase equalizer to
maintain this gap. The throat 3 part of the horn is required to have high machining accuracy. In
addition, the assembly of the diaphragm 4 (or the vibration system) also needs to be performed
with high accuracy, and the manufacturing cost is increased. EndPage: In order to hold the
diaphragm 4 in the correct position, it is necessary to use an edge 5 having a large stiffness. In
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general, one that is simultaneously formed of the same material as the diaphragm 4 is used. Still,
the lowest resonance frequency (fo) of the vibration system is taken to be higher than the cutoff
frequency (fo) of the horn. This is because the amplitude of the diaphragm 4 is larger than the
cutoff frequency (fo) of the horn when the lowest resonance frequency (fo) of the vibration
system is smaller than the cutoff frequency (fo) of the horn, the phase equalizer It collides with 2
and mechanical damage occurs. Therefore, the edge 5 is made of a material or shape having a
large stiffness, and as the amplitude of the diaphragm 4 increases (as the frequency decreases),
the non-linear distortion of the edge 5 rapidly increases as shown in FIG. 2 (C11). In addition, if
the diaphragm area (Sd) is increased in order to increase the conversion efficiency, the following
disadvantages occur. That is, since the vibration velocity of the air of the throat 3 of the horn
becomes extremely large compared to the vibration velocity of the diaphragm 4, non-linearity
occurs in the elasticity of the air, and harmonic distortion increases. This distortion increases in
proportion to the frequency (as the frequency becomes higher) as shown in FIG. 2 (d).
An object of the present invention is to eliminate the above-mentioned disadvantages of the prior
art, and to provide a horn-type speaker with less harmonic distortion and a wide reproduction
band frequency. The horn-type speaker according to the present invention does not have an
acoustic transformer and a phase equalizer, but places a diaphragm directly at the throat of the
horn, and harmonic distortion at high frequencies due to air overload at the throat of the horn To
reduce the occurrence of Since there is no restriction on the amplitude of the diaphragm by the
acoustic transformer and the phase equalizer, the impedance of the impedance formed by
thermoforming a soft material such as a non-woven fabric, a woven fabric, a synthetic resin, or a
film or foam material is obtained. It can be used. Therefore, even if the amplitude of the
diaphragm increases at low frequencies, the occurrence of harmonic distortion due to nonlinearity of the edge is small. In addition, distortion is generated in the drive system by setting
the lowest resonance frequency ('f) of the vibration system where the amplitude of the
diaphragm is the largest and harmonic distortion is maximum to be lower than the cutoff
frequency (fo) of the horn. But there is an advantage that it is not emitted as sound. Hereinafter,
the horn-type speaker of the present invention will be described in detail by way of examples.
FIG. 5 is a cross-sectional view showing one example of the horn-type speaker of the present
invention. In the embodiment of FIG. 3, the horn 1 is an exponential horn whose cross-sectional
area changes with an exponential function, or a hyper-political horn whose cross-sectional area
changes with a hyperbolic function, regardless of the cross-sectional shape. It is preferable to use
a horn having a cutoff frequency (fo) and a large radiation resistance near the cutoff frequency
(fo). Also, if the diameter of the throat 5 of the horn is equal to or larger than the diameter Dd of
the diaphragm 4, the on-axis sound pressure frequency characteristic is degraded as shown in
FIG. Although the shape of the vibration plate 4 is not fixed, it is desirable to use a dome shape or
an inverted dome shape in terms of suppression of occurrence of split resonance and reduction
of weight. Soft material such as nonwoven fabric, woven fabric and synthetic resin film or foam
so that the lowest resonance frequency (fo) of the drive system (or indicated as vibration system)
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is lower than the cutoff frequency (fo) of horn 1 If a drive system is constructed using, for
example, a high-compliance edge 5 'which is heat-formed into a roll shape or a gear shape, for
example, as compared with the conventional horn-type speaker shown in FIG. As in (d ?),
harmonic distortion in the low band can be significantly reduced. The harmonic distortion when
the cutoff frequency (fo) of the horn and the lowest resonant frequency (fo) of the drive system
are equal to y is similarly shown in FIG. 5 (d) for reference.
Thus, if the lowest resonance frequency (fo) of the drive system is lower than the cutoff
frequency (fo) of the horn, harmonic distortion is significantly smaller. (D) of FIG. 5 shows sound
pressure frequency characteristics, where (el is an impedance characteristic when the cant off
frequency (fc) of the horn and the lowest resonance frequency (fo) of the drive system are equal
to each other. (4) is the impedance characteristic when the lowest resonance frequency (fo) of
the drive system is about half of the cutoff frequency (f,) of the horn. EndPage: 2 FIG. 6 shows the
on-axis sound pressure frequency characteristic (d ') and the harmonic distortion characteristic
oJ') of the horn type speaker having the configuration shown in this embodiment. Comparing Fig.
6 with Fig. 2 showing the characteristics of the conventional horn type speaker, the harmonic
number is significantly reduced in the low and high frequency bands, and the reproduction
frequency band is wide and the on-axis sound is wide. It is clear that the pressure frequency
characteristic is flatter. Further, since the acoustic transformer 7 and the phase equalizer 2 which
are necessary for the conventional horn speaker are not necessary in the horn speaker of the
present invention, the machining accuracy of the throat 5 of the horn is greatly relaxed. The
assembly accuracy of the vibration system is reduced, the number of assembly steps is reduced
because the phase equalizer 2 with high parts cost is not used, and the manufacturing cost is also
reduced significantly.
4. Brief description of the drawings FIG. 1 is a cross-sectional view of a conventional horn
speaker, FIG. 2 is a characteristic diagram of a conventional horn speaker, FIG. 3 is a crosssectional view of the horn speaker of the present invention, FIG. The figure shows the sound
pressure frequency characteristics when the diameter ratio of the diameter of the diaphragm to
the diameter of the throat of the horn is changed, and FIG. 5 shows the lowest resonance
frequency of the drive system with the cutoff frequency of the horn speaker fixed. FIG. 6 is a
characteristic diagram showing a sound pressure frequency characteristic and a harmonic
distortion characteristic of the horn type speaker according to the present invention. 1 и и и и и и и и и
ииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии
и diaphragm 5 и и и и и и и и и и ииииииииииииииииииии 1 Double-class (to Hl) EndPage: 3 years and 3 figures) X4
Figure 0.5 / 2510 t'0111, X ? (KHx) age sr! One set of 3 L & (KHX) ? 2 Figure 57251020
EndPage: ?
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