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JP2017069888

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DESCRIPTION JP2017069888
Abstract: A frequency characteristic is achieved by reducing sound pressure over a
predetermined range of continuous frequency bands so that music can be enjoyed more
comfortably with a simple configuration of an acoustic method without using an electrical
method such as a graphic equalizer. To provide a speaker whose frequency and bandwidth
settings can be easily changed. A speaker provided with a horn type acoustic tube, one of a
floating ring shaped hollow structure surrounding an outer peripheral portion of a diaphragm
provided in the casing shell between the acoustic tube and the casing shell of the speaker. And a
plurality of through holes formed through the inner ring wall of the air chamber so that the air in
the hollow portion of the air chamber can enter and exit from the outside. . [Selected figure]
Figure 1
スピーカ
[0001]
The present invention relates to a loudspeaker.
[0002]
Conventionally, various methods for changing the frequency characteristics of sound waves
emitted from a sound emitting device such as a speaker are known. For example, an electrical
signal input to the speaker is passed through an electronic circuit to generate sound for each
fixed frequency band. This method uses a graphic equalizer, which is an electronic instrument
that increases or decreases pressure and adjusts it.
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[0003]
However, it goes without saying that this method requires the addition of a graphic equalizer,
and that it requires electricity to operate it.
In addition, graphic equalizers adjust not with sound waves but with electric signals before
conversion into sound waves, so the frequency characteristics become unnatural and artificial,
and acoustic natural and rich acoustic characteristics are lost. I have a problem.
[0004]
As a method of changing the frequency characteristic of the sound wave by the acoustic method,
for example, a method of disposing a sound absorbing material such as porous in a speaker
housing as in Japanese Patent Application Laid-Open No. 63-313998 and absorbing the whole
band frequency, A method of disposing an air chamber low pass filter at the center of the surface
to cut high frequency sound, a method of disposing a phase equalizer at the center of the surface
just in front of the diaphragm, a horn as disclosed in JP-A-5-344577, etc. There is known a
method in which a plurality of instruments for resonating a sound wave such as a resonance pipe
or a Helmholtz resonator are disposed in an acoustic pipe to offset and attenuate a speaker
resonance reflection wave.
[0005]
However, in the method of arranging the sound absorbing material and the low pass filter, the
sound pressure is reduced in a very wide range of frequency bands, and this is not a method of
adjusting the frequency band of a certain range.
[0006]
The method of arranging the phase equalizer is limited to the application of the high frequency
range, and since it is necessary to arrange a plurality of throats for each phase, the structure
becomes complicated and it takes time and effort to adjust the phase. is there.
[0007]
The technique for canceling and attenuating the speaker resonance reflected wave such as a
resonance tube or a Helmholtz resonator is a technique aimed at correcting the saturation (peak
dip) of the resonance reflected wave generated due to the acoustic impedance mismatch at the
horn opening end. There is no technology to change the sound pressure in a certain range of
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continuous frequency bands.
[0008]
If you want to enjoy music in an optimal state according to the user's preference, it is natural and
more comfortable without discomfort if the sound pressure can be changed in the frequency
band mainly used by the sound source or in the adjacent frequency band Good frequency
characteristics can be obtained.
However, the conventional acoustic methods are all techniques for uniformly cutting off very
wide frequency bands or correcting peak dips in very narrow bands, and as a result to enjoy
music more comfortably The purpose of changing the frequency characteristic can not be
achieved.
[0009]
In addition, in order to respond to the preferences of multiple different users, it is necessary to
have a mechanism that can easily replace the frequency characteristics of the sound wave
emitted from the speaker, but in any conventional acoustic method, the frequency characteristics
are fixed. There is also the problem of
[0010]
JP 63-313998 JP 5-344577
[0011]
The present invention does not use an electrical method such as a graphic equalizer, but has a
simple configuration of an acoustic method so as to enjoy music more comfortably, by reducing
the sound pressure over a range of continuous frequency bands. It is an object of the present
invention to provide a speaker which can easily change its frequency and bandwidth settings.
[0012]
In the invention according to claim 1, in the speaker provided with a horn type acoustic tube, a
float surrounding the outer peripheral portion of the diaphragm provided in the casing shell
between the acoustic tube and the casing shell of the speaker by 360 degrees. It has a structure
in which one air chamber of an annular hollow structure is sandwiched, and each length formed
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through the inner ring wall of the air chamber is not constant so that air in the hollow portion of
the air chamber can enter and exit from the outside. A plurality of through holes are provided.
[0013]
In the invention according to claim 2, in the speaker according to claim 1, the air chamber and
the acoustic pipe have a structure which can be detached from the housing shell, and the air
chamber and the acoustic pipe are exchanged. Thus, the frequency characteristics of the sound
wave emitted from the speaker can be changed.
[0014]
The present invention does not use the electrical method of adjusting with the electric signal
before converting into the sound wave such as graphic equalizer, and directly acts on the sound
wave emitted from the diaphragm by the acoustic method, so it does not consume electricity.
There is an effect that the natural and rich acoustic characteristics of the
[0015]
An air chamber having a floating annular hollow structure disposed in the vicinity of the outer
peripheral portion of the diaphragm has a plurality of through holes, and when the sound wave
emitted from the diaphragm passes near the through holes, the vibrating air is The sound energy
is converted into heat energy by the acoustic resistance of the air chamber as it passes into and
out of the air chamber through the through hole.
Since the amount of energy converted at this time depends on the length of the through holes, by
making the lengths of the plurality of through holes slightly different, the frequencies absorbed
by the respective through holes are slightly different, As a whole, the sound is absorbed over a
range of continuous frequency bands.
[0016]
Conventional acoustic methods aim at cutting frequencies over a wide band or correcting the
peculiarities of acoustic characteristics such as peak and dip of the speaker acoustic
characteristics, and the application of the technology contributes to the purpose of listening to
music comfortably While the present invention is limited to the non-specific frequency band and
the frequency characteristic is fixed and can not be changed, the present invention can change
the frequency characteristic over the optimum band for listening to music with a simple
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configuration and method. You can enjoy the music in a more comfortable condition.
[0017]
In the case of using a conventional low pass filter or phase equalizer, these devices need to be
installed on the front surface of the diaphragm, which limits the size, and as a result, the
frequency that can be handled is limited.
The frequency of the sound wave absorbed by the air chamber of the present invention depends
on the size of the air chamber, but the air chamber is located at the outer peripheral portion of
the diaphragm and there is no size limitation, and a wide range from low to high range It can
respond to the frequency.
[0018]
The air chamber of the present invention has a simple configuration with only one tool, does not
require adjustment such as phasing, and is located at a position on the outer peripheral portion
of the diaphragm that can be easily touched by human hands. It is easy to make it possible.
If the air chamber is removable, the user can enjoy the frequency characteristics of the normal
state of the original speaker when the air chamber is not attached, and can enjoy different
frequency characteristics when the air chamber is attached.
If a plurality of air chambers having different frequency characteristics are prepared, the air
chambers can be replaced as appropriate according to the preference of the user and the
acoustic characteristics of a plurality of different sound sources, and more optimal states can be
selected to enjoy music.
[0019]
The air chamber and the acoustic tube vary in size and shape depending on the acoustic
characteristics, but different colorings and paintings are applied to the surface of these devices,
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and text information such as a description of the acoustic characteristics and a brand logo is
added. ing.
The air chamber and the acoustic tube are located in front of the diaphragm so that they can be
easily seen by the user, the application and purpose can be easily known from the character
information, the convenience is enhanced, and the appearance change is also enjoyed each time
they are replaced. be able to.
[0020]
It is an explanatory view of a speaker of an embodiment of the present invention.
It is the horizontal sectional view which looked up at the upper direction in the AA cross section
of the speaker shown in FIG.1 (b).
It is a graph which shows the effect of embodiment of this invention.
It is a graph which shows the effect of embodiment of this invention.
It is an explanatory view of a speaker of an embodiment of the present invention.
[0021]
Hereinafter, embodiments of the present invention will be described based on the drawings.
[0022]
FIG. 1 is an explanatory view of an embodiment of claim 1 of the present invention.
FIG. 1 (a) is a perspective view of an embodiment of the present invention.
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FIG. 1 (b) is a front sectional view cut along a plane parallel to the central axis of the embodiment
of the present invention.
In FIG. 1, reference numeral 100 denotes a diaphragm for converting an electrical signal into a
sound wave. Reference numeral 101 denotes a housing shell for fixedly supporting the
diaphragm 100 and closing and blocking a space so that sound waves emitted to the back
surface of the diaphragm 100 leak to the outside to prevent interference attenuation.
[0023]
Reference numeral 102 denotes an air chamber for absorbing sound waves emitted from the
front of the diaphragm 100, and is composed of two parts, a cylindrical air chamber inner ring
wall 102a of the inner ring portion and an air chamber shell 102b of the outer ring portion. The
air chamber 102 has a floating ring-like hollow structure as a whole. The air chamber 102 is
disposed in the vicinity of the outer periphery of the diaphragm 100 so as to surround the
diaphragm 100 360 degrees, and is connected to the housing shell 101.
[0024]
An acoustic pipe 103 has a spherical shape in which the open end gradually spreads like an arc
curve toward the external space, and the acoustic pipe 103 is smoothly connected to the inner
annular wall 102 a of the air chamber. The sound waves emitted from the front of the air
chamber sequentially pass through the air chamber inner ring wall 102a and the inside of the
acoustic tube 103 and are finally emitted to the outside space.
[0025]
Reference numeral 104 denotes a through hole, which penetrates the air chamber inner wall
102a, and a plurality of holes are formed.
[0026]
FIG. 2 is a horizontal cross-sectional view looking up the direction in which the acoustic tube 103
is present in the section AA cross section where the through hole 104 of the speaker shown in
FIG. 1B is present.
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[0027]
In FIG. 2, reference numeral 102 denotes an air chamber, which comprises an air chamber inner
ring wall 102a and an air chamber outer wall 102b to form a hollow structure.
Reference numerals 104a to 104d denote a plurality of through holes penetrating the equalizer
inner ring wall 102a, and four are formed in this embodiment.
External air can pass into and out of the air chamber 102 through the through holes 104 a-d.
[0028]
The air chamber inner ring wall 102a is not uniform in thickness as shown in FIG. 2, and the
length of the through hole 104a is d1, the length of the through hole 104b is d2, the length of
the through hole 104c is d3, and the through hole 104d is When the length is d4, each has a
different length d1> d2> d3> d4.
[0029]
The operation of the speaker configured as described above will be described below.
The sound wave emitted to the back of the diaphragm 100 is closed to the housing shell 101, but
the sound wave emitted to the front passes through the air chamber inner wall 102a and the
space inside the acoustic tube 103, and finally the sound From the open end of the tube 103 to
the outside space.
When the acoustic tube 103 has a spherical shape as in the present embodiment, the acoustic
impedance in the space in the traveling direction of the acoustic wave changes continuously and
gradually, so that the acoustic reflection due to the acoustic impedance mismatch is extremely
small. It has a flat frequency characteristic as shown by the solid line of (i) of FIG. 3 (a) with few
peaks and dips on the frequency characteristic.
[0030]
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When a sound wave or vibrating air passes through the inner portion of the air chamber inner
surface wall 102a, air flows in and out of the air chamber 102 through the through holes 104a
to d, and acoustic energy of the air chamber 102 causes sound energy to be thermal energy. A
sound wave of a frequency determined by the equation is absorbed.
[0031]
Since the through holes 104 a-d are slightly different in length, the frequency of the sound wave
absorbed by each through hole 104 a-d is slightly different, and the sound pressure is smooth in
a continuous range of frequency bands as a whole. Reduced.
For this reason, the sound wave emitted from the open end of the acoustic tube 103 to the
external space is reduced in the continuous band portion as shown by the broken line (b) in FIG.
When the user listens to the sound wave, the constant continuous band changes to a suppressed
frequency characteristic. As a result, it is natural to change the frequency band in the frequency
band most frequently used by a certain sound source or a continuous band in the vicinity thereof,
and provide the through holes 104a to 104d so that the user can hear the most comfortable
frequency characteristics. You will be able to listen to the music more fun with acoustic
characteristics that do not make you feel uncomfortable.
[0032]
By changing the values of the lengths d1 to d4 of the through holes 104a to 104d, it is possible
to raise or lower the sound absorption frequency band as a whole, and to widen or narrow the
bandwidth.
[0033]
In the case where the frequency characteristic is the broken line (b) in FIG. 3 (a), when the
lengths of d1 to d4 are uniformly increased, the frequency band to be absorbed is indicated by
the broken line (c) in FIG. 3 (a) As shown in the broken line (d) of FIG. 3 (a), the frequency band
to be absorbed is shifted to the high range side as a whole when the sound is shifted to the low
range side and d1 to d4 are shortened. .
[0034]
In the case where the frequency characteristic is the broken line (e) in FIG. 3 (b), when the
variation in the length of d1 to d4 is increased, the frequency bandwidth to be absorbed is shown
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by the broken line (f) in FIG. 3 (b) Conversely, when the variation in the length of d1 to d4 is
reduced, the frequency band absorbed is narrowed as shown by the broken line (G) in FIG. 3 (b).
[0035]
When it is desired to emphasize a specific frequency band, for example, to emphasize a bass
frequency band of 300 Hz or less, the sound pressure of a 300 Hz to 1000 Hz frequency band,
for example, a 300 Hz frequency band directly above 300 Hz as shown in FIG. If the through
holes 104a to 104d are provided to reduce the bass frequency band, the bass frequency band of
300 Hz or less can be heard relatively large due to the masking effect, and an auditory effect
similar to that obtained by amplifying the bass frequency band is brought about.
[0036]
A porous sound absorbing material such as glass wool or rock wool having a characteristic of
absorbing the high frequency band as shown in FIG. 4 (h) is attached to the surface of the air
chamber inner wall 102a, and through holes 104a to d. By sharing the frequency band to be
absorbed, it is possible to absorb the wide band frequency, and the masking effect of the bass
frequency band becomes more effective.
[0037]
In this embodiment, the frequency characteristics of the sound waves emitted from the speaker
are changed by changing the lengths d1 to d4 of the through holes 104a to d. However, the air
layer thickness of the air chamber 102, that is, the air chamber inner wall 102a and the air The
frequency characteristics may be changed by changing the distance between the chamber shells
102b.
Alternatively, the diameters of the through holes 104 a-d may be changed.
You may mix these several methods.
[0038]
Although four through holes 104 are provided in this embodiment, any number of conditions
may be provided as long as the frequency of the sound wave to be absorbed is satisfied.
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[0039]
In the present embodiment, the sound tube 103 has a flat shape with a spherical shape having a
flat frequency characteristic, but in order to emphasize a specific narrow frequency band, an
exponential that is likely to cause a peak dip due to a resonance reflection wave. A horn or a
simple tube may be used.
In order to give directivity, it is good also as parabola curve shape.
[0040]
In order to increase the sound absorption efficiency, it is preferable that the through holes 104 ad be disposed at the sound wave closing end near the diaphragm 100 as much as possible.
[0041]
FIG. 5 shows another embodiment, in which the air chamber 102 and the acoustic tube 103 are
detachable from the housing shell 101.
Reference numeral 500 a denotes a mount provided on the outer peripheral portion of the
diaphragm 100, and reference numeral 502 b denotes a mount connecting member provided in
the air chamber 102.
The air chamber 102 is attached and connected to the casing shell 101 by the bayonet
mechanism of the mount 500a and the mount connecting member 502b.
[0042]
Although the frequency band mainly used by the sound source differs depending on the type of
musical instrument such as violin and ukulele, and the type of music such as classical music and
rock music, the frequency characteristic suitable for the target sound source such as each
musical instrument and music genre If the air chamber 102 and the sound tube 103 which are
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possessed are prepared in advance, it can be exchanged according to the type of musical
instrument or music to be heard by the user.
Different users can also exchange music and enjoy it according to their preferences.
[0043]
For example, since rock music has a relatively large sound pressure in the bass frequency band
of the bass, if the user listens to rock music by emphasizing the bass frequency band, the user
can enjoy more music, so the sound in the middle to high frequency band is Wearing the air
chamber 102 for reducing pressure emphasizes the movement of the rock music base and is
effective.
[0044]
The air chamber 102 and the acoustic tube 103 have different sizes and shapes depending on
frequency characteristics.
On these surfaces, different colorings and paintings are applied according to the target sound
source instruments, and design decorations are given according to the type of music, and the
description of the acoustic characteristics, maker and brand logo, etc. Text information 105 is
also printed.
[0045]
For example, the surface of the air chamber 102 and the acoustic tube 103 designed for a violin
is given a wood grain print similar to the appearance of a violin, and a varnish coating having a
gloss similar to that used for violin coating And text information 105 such as an explanatory note
indicating that the application is for a violin and acoustic characteristics and a manufacturer's
name brand logo are printed.
Therefore, when these are mounted on a speaker, the user can easily recall that they are the air
chamber 102 and the sound tube 103 for a violin, and also the appearances related to the types
of musical instruments and music that the user likes It can be enjoyed.
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[0046]
In the present embodiment, the air chamber 102 and the acoustic tube 103 can be detached
from the casing shell 101 by the bayonet mechanism, but may be detached by another
mechanism such as spiral screw instead of the bayonet mechanism.
[0047]
Reference Signs List 100 diaphragm 101 housing shell 102 air chamber 102a air chamber inner
ring wall 102b air chamber shell 103 acoustic pipe 104 through hole 104a through hole 104a
through hole 104b length d2 through hole 104c length d3 through hole 104d length d4
Through hole 105 character information 500a mount 500b mount connecting member
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