close

Вход

Забыли?

вход по аккаунту

?

JPH0423698

код для вставкиСкачать
Patent Translate
Powered by EPO and Google
Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
financial decisions, should not be based on machine-translation output.
DESCRIPTION JPH0423698
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker system provided with a plurality of independent types of cabinet and nod parts on the
back of a diaphragm used as an indoor and outdoor sound reproduction device. 2. Related Art In
recent years, due to the tendency of lightness, thinness, and smallness, a speaker system having a
small installation area is also required. Among them, the depth is reduced and the diaphragm
area is increased to reduce distortion and plane wave A speaker system that reproduces the
sound field is often used. Hereinafter, the conventional speaker system as described above will be
described with reference to the drawings. FIG. 4 is a sectional view of a conventional thin largearea speaker system. In the figure, 1 is a cabinet, 2 is a diaphragm, 3 is an outer suspension, or 3
is an inner edge, 4 is an inner edge, 5 is a frame, 6a, 6b is a voice coil, 7 is a rear open cabinet, 8
is a closed cabinet empty room. The outer periphery of the outer edge 3 is fixed to the frame 5
and the inner periphery is fixed to the diaphragm 2. One end of the inner edge 4 is an inner edge
between the outer periphery of the diaphragm 2 and the root fixed to the voice coils 6a and 6b.
The other end of 4 is fixed to the frame 5. A rear open cabinet 6 is provided by the diaphragm 2,
the inner edge 4 and the cabinet 1, and a closed cabinet 8 is provided by the diaphragm 2, the
outer edge 3, the inner edge 4 and the cabinet 1. The operation of the speaker system configured
as described above will be described below. The driving force is transmitted from the voice coils
6a and 6b to the diaphragm 2, and the sound is emitted directly from the front of the diaphragm
2. The sound on the back of the diaphragm is in the closed cabinet 8 and in the back open
cabinet 7 It is emitted. SUMMARY OF THE INVENTION In the conventional configuration as
described above, the sound radiated to the rear open cabinet cavity 7 is directed to the front of
the speaker system if there is a reflector such as a wall near the rear of the speaker system.
Synthesized with the wraparound front sound. In addition, even in the case where there is no
reflective material, the light leaks to the front surface by the diffraction phenomenon. In this
10-05-2019
1
case, the amount of sound that wraps around is smaller than when there is a reflector. The sound
radiated from the back is in reverse phase to the front sound. When the front and back sounds
are synthesized because the back front turns to the front and there is a difference in distance
between the front sound and the front sound, and the vibration area of the back open cabinet is
much smaller than the area of the front of the diaphragm It does not completely cancel each
other, but it is several dB lower than the sound pressure level of the front sound only. This occurs
in a low frequency range of about 50 to 200 Hz.
As described above, according to the conventional method, the sound pressure drop of the bass
region due to the wraparound to the front in the front of the back has been a problem.
SUMMARY OF THE INVENTION It is an object of the present invention to provide a speaker
system capable of reducing the sound pressure drop of bass due to the wraparound to the front
on the front side of the rear and increasing the sound pressure level. Means for Solving the
Problem In order to achieve this object, the speaker system of the present invention is provided
with a rear open cabinet, a gutter and a phase inversion cabinet on the back of one diaphragm,
and a partition between the two cabinets. When sound is emitted from the above two cabinets to
the back of the system by providing a boat or passive radiator of phase-reversal cavity 2 nod, the
two sounds are emitted outside after being synthesized in the cabinet And Operation With this
configuration, the sound emitted from the back open cabinet, which is in antiphase with the front
noise, and the sound of the phase reversal cabinet, which is antiphase, affect the state of the back
of the system in the cabinet. It is definitely synthesized without being emitted and emitted as the
front on the back. However, if the positions of the front and back front of the open back cabinet
and the phase inversion cabinet are located outside the cabinet, the back front emitted from the
two cabinets is affected by the condition of the back of the speaker system It can not be
synthesized completely as in the present invention because it is synthesized after receiving the In
the present invention, by performing this synthesis completely, it is possible to efficiently reduce
the front of the back, which is in antiphase with the front sound, and reduce the amount of
cancellation of the front sound by the front of the back. Can be increased. Embodiment An
embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a
view showing a structural new side of a speaker system according to an embodiment of the
present invention. In the figure, 9 is a cabinet, 10 is a diaphragm, 11 is an outer edge which is a
first suspension, 12 is an inner engine which is a second suspension, 13 is a frame, 14a and 14b
are voice coils, and 15 is a second A rear open cabinet is a cabinet, 16 is a first cabinet, a phase
inversion cabinet, and 17a and 17b are ports. The outer periphery of the outer edge 11 is fixed
to the frame 13 at its inner periphery to the diaphragm 10, and one end of the inner edge 12 is
at the inner edge 12 between the outer periphery of the diaphragm 10 and the root portion to
which the voice coils 14a and 14b are fixed. The other end is fixed to the frame 13. A back open
cabinet cavity 15 is provided by the diaphragm 10, the inner edge 12 and the cabinet 9, and a
phase reversal cabinet cavity 16 is provided by the diaphragm 10, the outer edge 11, the inner
edge 12 and the cabinet 9, The partition plate between the reversing cabinet 16 and the rear
10-05-2019
2
open cabinet is provided with ports 17a and 17b.
In addition, description is abbreviate | omitted because a magnetic circuit, a damper, etc. are
known. The operation of the speaker system configured as described above will be described
below. The driving force is transmitted from the voice coils 14a and 14b to the diaphragm 10,
and the sound is emitted directly from the front of the diaphragm 10. The sound on the back of
the diaphragm is to the back open cabinet 15 and the phase reversal cabinet 16 It is emitted. The
sound radiated to the phase inversion cabinet chamber 16 causes resonance in the acoustic
compliance of the chamber and the acoustic mass of the ports 17a and 17b, and the phasereversed sound is emitted from the opening of the baud N 7a and 17b. The sound radiated to the
rear open cabinet cavity 15 is synthesized with the sound radiated from the bow eyes 7a and
17b opposite in phase to this, and this is turned to the front as a back sound. At this time, even if
the speaker system is a very thin cabinet and has a large-area diaphragm, and the volume of the
phase inversion cabinet can not be made sufficiently large, and the effect of phase inversion can
not be sufficiently obtained, the opposite to the front sound The sound pressure of the back
sound, which is the phase, can be reduced, and the synthetic sound of the front and back sounds
can be increased by about 3 dB by using a conventional closed cabinet as a phase reversal
cabinet. Here, in order not to raise the resonance frequency of the speaker system, the resonance
frequency of the phase inversion cabinet needs to be set to a frequency lower than the lowest
resonance frequency of the speaker system in the conventional example. When set in this
manner, the amplitude of the diaphragm becomes very small at the resonance frequency f of the
phase inversion cabinet, so that the harmonic distortion is considerably reduced. Also, it is
necessary to increase the length of the ports H7a and 17b in order to set the resonance
frequency low, and in the thin cabinet there is also a method of bending the boat in order to fit
the boat in the cabinet. Furthermore, by providing a straight tube shaped boat on the back of the
cabinet, viscous resistance is not added to the boat when the port is bent, and the effect of phase
inversion can be obtained large. This is as shown in the impedance frequency characteristic of
FIG. In the figure, A is a conventional example, B is an example when the boat is bent, and C is a
present example using a straight pipe port. Furthermore, the opening of the boat is provided in
the open back cabinet and the inverted phase cabinet, and the reflectors on the back of the
speaker system are provided to ensure that the sound from the two cabinets is synthesized
before it is emitted to the outside of the cabinet. It is synthesized under the same conditions
without being influenced by the condition such as obstacles, and suppresses the antiphase sound
which cancels the front sound when coming out to the front among the sound radiated from the
back, the effect of the bass level increase It is obtained large.
The figure which shows the frequency characteristic of these Examples and a prior art example is
FIG. In the figure, D is the sound pressure characteristic according to the conventional example, E
is the sound pressure characteristic according to the embodiment when the port is bent, F is the
10-05-2019
3
sound pressure characteristic according to the present embodiment using a straight tube boat,
and G is the third embodiment according to the prior art Second harmonic distortion
characteristics, H is a second harmonic distortion characteristics according to the present
embodiment. In the present embodiment, a port is used in the phase inversion cabinet as the
resonance system sound volume, but the same effect can be obtained by using a passive radiator
(not shown) instead of the port. Further, the types of the first and second cabinet parts may be
interchanged, and the number of voice coils is not limited to the example. According to the
present invention, a speaker system is provided by providing the rear open cabinet and the phase
reversing cabinet on the back of one diaphragm and providing the sound g mass of the phase
reversing cabinet resonance system in the partition between the two cabinets. The sound
pressure level of the bass in the front is increased by effectively reducing the sound pressure
response of the back sound, which is in antiphase with the sound of the front, and reducing the
amount of cancellation of the front sound by the back sound. The present invention is to realize a
speaker system with little characteristic change due to reflection and reflection.
[0002]
Brief description of the drawings
[0003]
1 is a structural sectional view of a speaker system according to an embodiment of the present
invention, FIG. 2 is an impedance frequency characteristic view, FIG. 3 is a frequency
characteristic view, and FIG. 4 is a structural sectional view of a conventional speaker system.
9
иииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии
ииииии frame, 14a, 14b ииииии voice coil, 15 ... - and rear side open cabinet-throat rates, 16 ... - ... the
phase inversion cabinet-throat rates, 17a, 17b иии --- Port. Agent's Name Attorney Attorney
Shigetaka Takano One person Figure Fig. Figure! О???
10-05-2019
4
Документ
Категория
Без категории
Просмотров
0
Размер файла
13 Кб
Теги
jph0423698
1/--страниц
Пожаловаться на содержимое документа