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DESCRIPTION JP2009065369

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DESCRIPTION JP2009065369
[PROBLEMS] To provide a compact speaker device capable of enhancing low-range volume
feeling and low-range sound expansion and improving low-range reproduction power. A speaker
housing 3 of a speaker device 1 has an inner housing 8 and an outer housing 9. The inner
housing 8 has a speaker unit 2 at one end and an opening 15 formed at the other end. The air
chamber 14 is formed between the speaker unit 2 and the end wall 12. The outer housing 9 has
a bottom wall 18 facing the end wall 12 and coaxially surrounds the inner housing 8. A first
resonance duct 22 is formed between the bottom wall 18 of the outer housing 9 and the end wall
12 of the inner housing 8 and extends in the radial direction of the inner housing 8 from the
peripheral edge of the opening 14. A second resonant duct 28 is formed between the outer
housing 9 and the inner housing 8. The second resonance duct 28 is connected to the first
resonance duct 22 and extends in the axial direction of the inner housing 8 so as to surround the
air chamber 14 and opens around the speaker unit 2. [Selected figure] Figure 2
Speaker apparatus and speaker housing
[0001]
The present invention relates to a speaker device having an air chamber behind a speaker unit,
and more particularly to a structure for enhancing the ability to reproduce low-range sound
without electrical processing. Furthermore, the present invention relates to a speaker housing
having a structure that is compact but enhances the ability to reproduce low-range sound.
[0002]
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1
When the volume emitted from the speaker unit is small, the human ear is dulled in sensitivity to
low and high frequency sounds, and gives a poor impression particularly with respect to low
frequency sounds. In order to compensate for this, conventionally, the output of low-range sound
has been enhanced by using the roundness function and tone control function of an amplifier.
However, the electrical amplification processing of the amplifier can not strictly avoid the
deterioration of the sound quality, and becomes a problem in enhancing the ability to reproduce
low-range sound.
[0003]
On the other hand, a speaker apparatus having a small-aperture speaker unit includes a speaker
housing of a bass reflex structure in order to enhance the output of low-frequency sound of, for
example, 100 Hz or less. In this type of speaker device, as disclosed in, for example, Patent
Document 1, a speaker unit and a plurality of bass reflex ports are provided on the front panel of
the speaker housing. The bass reflex ports are arranged around the speaker unit, and ducts are
connected to the respective bass reflex ports. The duct is accommodated in an air chamber inside
the speaker housing, and connects the air chamber and the bass reflex port.
[0004]
According to such a speaker device, the low frequency sound emitted from the rear surface of the
speaker unit to the air chamber of the speaker housing can be guided from the duct to the bass
reflex port and taken out in front of the speaker housing. Therefore, it is possible to enhance the
ability to reproduce low-range sounds without performing electrical amplification processing.
Unexamined-Japanese-Patent No. 2006-121591
[0005]
According to the speaker device disclosed in Patent Document 1, the sound wave emitted from
the back surface of the speaker unit tries to spread evenly in the air chamber of the speaker
housing.
[0006]
However, since a plurality of ducts are accommodated in the air chamber of the speaker housing,
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2
the presence of these ducts inhibits the spread of the sound wave emitted from the back of the
speaker unit or causes distortion of the sound. I can not deny it.
[0007]
Moreover, since the plurality of ducts are accommodated in the air chamber of the speaker
housing, the thickness and the length of the duct are restricted by the capacity of the air
chamber, the shape of the speaker housing, and the like.
As a result, it becomes difficult to efficiently extract the sound waves emitted to the air chamber
from the back of the speaker unit to the outside of the speaker housing, and the volume of low
frequency sound is felt despite the use of the speaker housing of bass reflex structure. Problems
such as poor
[0008]
SUMMARY OF THE INVENTION The object of the present invention is to obtain a compact
speaker device while being able to sufficiently enhance the loudness of low-range sound and the
expansion of sound in the low-range direction and to improve low-range sound reproduction. It is
in.
[0009]
Another object of the present invention is to obtain a speaker housing capable of sufficiently
enhancing the volume of low frequency sound and the expansion of sound in the low frequency
direction while having a compact configuration.
[0010]
In order to achieve the above object, a speaker device according to one aspect of the present
invention includes: a speaker unit; and a speaker housing to which the speaker unit is attached.
The speaker housing has (1) the speaker unit at one end and an end wall having an opening
formed at the other end located behind the speaker unit, and the speaker unit and the end wall
And (2) a cylindrical outer casing coaxially surrounding the inner casing and having a bottom
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3
wall facing the end wall. (3) A first resonance duct formed between a bottom wall of the outer
housing and an end wall of the inner housing and extending radially from the peripheral edge of
the opening in the outer housing and the inner housing; (4) formed between the outer casing and
the inner casing and connected to the first resonance duct, and extending in the axial direction of
the outer casing and the inner casing so as to surround the air chamber A second resonant duct
that opens around the speaker unit; It is characterized in that to obtain.
[0011]
In order to achieve the above object, a speaker housing according to one aspect of the present
invention has an attachment portion to which a speaker unit is attached at one end, and an end
having an opening formed at the other end located behind the attachment portion. A tubular
inner casing having a wall and an air chamber formed between the mounting portion and the end
wall, a bottom wall facing the end wall, and coaxially surrounding the inner casing And a
cylindrical outer case, between the bottom wall of the outer case and the end wall of the inner
case, from the periphery of the opening of the opening, the outer case and the inner case A first
resonance duct extending in the radial direction, and an axially extending direction of the outer
casing and the inner casing between the outer casing and the inner casing so as to surround the
air chamber; Two resonant ducts are formed.
The second resonance duct is connected to the first resonance duct and is open at the periphery
of the mounting portion.
[0012]
According to the present invention, the low frequency sound wave emitted from the speaker unit
to the air chamber is guided from the opening of the inner casing to the first resonance duct.
Further, the sound waves are uniformly spread in the first resonance duct in the radial direction
of the speaker housing, and then guided to the second resonance duct, and from the periphery of
the speaker unit through the second resonance duct It is taken out outside.
[0013]
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For this reason, the expansion of the sound wave in the air chamber may not be inhibited, the
deterioration of the sound quality can be prevented, and the clear sound quality with less
distortion can be obtained. At the same time, the first resonant duct and the second resonant
duct cooperate with each other to form a space having a sufficient length and capacity around
the air chamber, thereby mainly securing a low-pass sound volume. At the same time, it is
possible to sufficiently enhance the growth of sound in the low frequency direction. Therefore, it
is possible to enhance the ability to reproduce low-range sound from the stage where the sound
volume is small without performing electrical amplification processing.
[0014]
Moreover, since the first and second resonance ducts are located between the coaxially combined
inner and outer housings, the speaker housing itself can be made compact. Therefore, a large
installation space is not required, and the appearance of the speaker housing is improved.
[0015]
Hereinafter, a first embodiment of the present invention will be described based on FIGS. 1 to 6.
[0016]
1 and 2 disclose a speaker device 1 for audio equipment, for example.
The speaker device 1 includes a speaker unit 2 and a speaker housing 3 to which the speaker
unit 2 is attached. The speaker unit 2 has the same configuration as that of the conventionally
known one, and includes the diaphragm 5 driven by the magnetic circuit unit 4. The outer
peripheral edge portion of the diaphragm 5 is supported by the speaker frame 6.
[0017]
The speaker housing 3 includes an inner housing 8 and an outer housing 9. The inner case 8 and
the outer case 9 are made of wood as a preferable example, but the material of the inner case 8
and the outer case 9 is not limited to wood, and for example, a synthetic resin material may be
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5
used.
[0018]
The inner casing 8 has a peripheral wall 10, a first end wall 11 and a second end wall 12. The
peripheral wall 10 has a hollow cylindrical shape. The first end wall 11 is located at one end
along the axial direction of the peripheral wall 10, and a speaker mounting hole 13 as a
mounting portion is formed at the center of the first end wall 11. The second end wall 12 is
located at the other end along the axial direction of the peripheral wall 10 so as to face the first
end wall 11. The circumferential wall 10, the first end wall 11 and the second end wall 12
cooperate with one another to define an air chamber 14 inside the inner housing 8.
[0019]
The speaker unit 2 is attached to the speaker attachment hole 13 of the inner case 8. The
speaker unit 2 is incorporated in the first end wall 11 with the diaphragm 5 facing the outside of
the inner case 8, and the magnetic circuit unit 4 located behind the diaphragm 5 is an air
chamber 14. Exposed to Therefore, the second end wall 12 of the inner case 8 is located behind
the speaker unit 2.
[0020]
A circular opening 15 is formed at the center of the second end wall 12. The opening 15 opens
into the air chamber 14 behind the speaker unit 2. It is desirable that the diameter of the opening
15 be approximately equal to the diameter of the diaphragm 5 of the speaker unit 2.
[0021]
The outer housing 9 has a peripheral wall 17 and a bottom wall 18. The peripheral wall 17 has a
hollow cylindrical shape and coaxially surrounds the peripheral wall 10 of the inner casing 8.
One end along the axial direction of the peripheral wall 17 forms an open end 17a that opens in
the axial direction while maintaining the aperture as it is, and the first end wall 11 of the inner
case 8 is located at the open end 17a. There is. The bottom wall 18 closes the other end along
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the axial direction of the peripheral wall 17. The bottom wall 18 is disposed parallel to the
second end wall 12 of the inner housing 8 so as to face the second end wall 12.
[0022]
As shown in FIGS. 2 and 4, four spacers 19 are interposed between the second end wall 12 of the
inner housing 8 and the bottom wall 18 of the outer housing 9. Each spacer 19 is held at a fixed
position between the second end wall 12 and the bottom wall 18 by a screw 20 and is spaced
apart in the circumferential direction of the speaker housing 3. The screw 20 is screwed into a
nut 21 embedded in the second end wall 12 through the bottom wall 18 and the spacer 19.
[0023]
By this screwing, the second end wall 12 and the bottom wall 18 are connected to each other,
and a first resonance duct 22 is formed between the second end wall 12 and the bottom wall 18.
The first resonance duct 22 extends from the periphery of the opening of the opening 15 in the
radial direction of the speaker housing 3 and is continuous with the air chamber 14 via the
opening 15.
[0024]
As shown in FIGS. 2 and 3, four other spacers 25 are interposed between the peripheral wall 10
of the inner housing 8 and the peripheral wall 17 of the outer housing 9. Each spacer 25 is held
at a fixed position between the peripheral wall 10 and the peripheral wall 17 by a screw 26 and
is arranged at intervals in the circumferential direction of the speaker housing 3. The screw 26 is
screwed into a nut 27 embedded in the peripheral wall 10 through the peripheral wall 17 and
the spacer 25.
[0025]
By this screwing, the circumferential wall 10 of the inner casing 8 and the circumferential wall
17 of the outer casing 9 are coaxially connected, and a second resonance duct 28 is formed
between the circumferential walls 10 and 17. The second resonance duct 28 is continuous with
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the outer peripheral end of the first resonance duct 22 and coaxially surrounds the air chamber
14. Therefore, the second resonance duct 28 has a ring-like cross-sectional shape and extends in
the axial direction of the speaker housing 3.
[0026]
The second resonant duct 28 has a sound outlet 28 a on the opposite side of the first resonant
duct 22. The sound emission port 28 a is opened along the axial direction of the speaker housing
3 so as to coaxially surround the periphery of the speaker unit 2.
[0027]
According to the present embodiment, the first resonance duct 22 has a width dimension W1
along the axial direction of the speaker housing 3. Similarly, the second resonance duct 28 has a
width dimension W2 along the radial direction of the speaker housing 3. The width dimension
W1 of the first resonance duct 22 and the width dimension W2 of the second resonance duct 28
satisfy the relationship of W1 ≦ W2. The width dimensions W1 and W2 of the first and second
resonant ducts 22 and 28 can be determined from the Helmholtz resonance equation based on
the relationship with the volume of the air chamber 14.
[0028]
Specifically, for example, in a speaker device 1 in which a speaker housing 3 having an outer
housing 9 having a diameter of 13 cm and a total length of 26 cm and an inner housing 8 having
a diameter of 12 cm and a speaker unit 2 having an aperture of 8 cm is used. The width
dimensions W1 and W2 of the first and second resonance ducts 22 and 28 are preferably set to
5 mm.
[0029]
When the width W2 of the second resonance duct 28 surrounding the air chamber 14 is 5 mm,
the ring-shaped second resonance duct 28 has the same cross-sectional area as the bass reflex
port of about 5 cm in diameter.
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8
The upper limit values of the width dimensions W1 and W2 of the first and second resonance
ducts 22 and 28 change according to the diameter of the speaker unit 2, the capacity of the air
chamber 14, and the like. On the other hand, if the width dimensions W1 and W2 are too small,
the sound passing through the first and second resonance ducts 22 and 28 will be blocked, so
the lower limit of the width dimensions W1 and W2 should be at least 3 mm. Is required.
[0030]
As shown in FIG. 2, a protrusion 30 is formed on the inner surface of the bottom wall 18 of the
outer housing 9. The protrusion 30 coaxially protrudes toward the opening 15 of the inner
housing 8 and has a conical shape that tapers in a direction from the bottom wall 18 toward the
opening 15.
[0031]
A pair of lead wires 31 a and 31 b are connected to the magnetic circuit unit 4 of the speaker
unit 2. The lead wires 31 a and 31 b are led from the air chamber 14 to the opening 15 and
electrically connected to a pair of connection terminals 32 a and 32 b provided on the bottom
wall 18 of the outer housing 9.
[0032]
Furthermore, four legs 33 are attached to the outer surface of the bottom wall 18 of the outer
housing 9. The legs 33 are in contact with, for example, the installation surface G on which the
speaker housing 3 is installed, and in the present embodiment, the head of the screw 20 is
covered and concealed. Therefore, the speaker device 1 is installed on the installation surface G
with the speaker unit 2 facing upward in the vertical posture.
[0033]
According to the speaker device 1 having such a configuration, the low-range sound wave
emitted from the speaker unit 2 to the air chamber 14 of the speaker housing 3 spreads
uniformly in the air chamber 14. This sound wave is guided from the opening 15 of the inner
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9
housing 8 to the first resonance duct 22 and spreads inside the first resonance duct 22 radially
outward of the speaker housing 3. Further, the sound wave is guided from the outer peripheral
end of the first resonance duct 22 to the second resonance duct 28, passes through the inside of
the second resonance duct 28 in the axial direction of the speaker housing 3, and The sound is
taken out from the periphery of the speaker unit 2 to the outside of the speaker housing 3
through the sound emission port 28 a of the second resonance duct 28.
[0034]
Therefore, the spread of the sound wave in the air chamber 14 of the speaker housing 3 is not
impeded, and deterioration of the sound quality can be prevented, and a clear sound quality with
little distortion can be obtained.
[0035]
Furthermore, the first resonance duct 22 radially extending in the speaker housing 3 and the
second resonance duct 28 axially extending in the speaker housing 3 cooperate with each other
to have a sufficient length around the air chamber 14. It forms a space having a capacity.
[0036]
Moreover, the cross-sectional area of the first resonance duct 22 increases in proportion to the
increase in the diameter of the second end wall 12 and the bottom wall 18 as it goes radially
outward of the speaker housing 3, and the sound waves pass The passage is being expanded
gradually.
For this reason, the first resonance duct 22 plays a role of backload horn amplification even
though the radial dimension of the speaker housing 3 is short.
This function is further enhanced by making the width dimension W2 of the second resonance
duct 28 slightly larger than the width dimension W1 of the first resonance duct 22.
[0037]
As a result, it is possible to sufficiently enhance the expansion of the sound in the low band
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10
direction while securing the volume feeling of the low band sound taken out from the sound
emission port 28a. Therefore, it is possible to enhance the ability to reproduce low-range sound
from the stage where the sound volume is small without performing electrical amplification
processing.
[0038]
In addition, according to the present embodiment, the bottom wall 18 of the outer housing 9 has
a conical projection 30 projecting toward the opening 15 of the inner housing 8. The guided
sound waves are uniformly guided to the first resonance duct 22 along the outer peripheral
surface of the protrusion 30. At the same time, the outer peripheral surface of the projection 30
is inclined with respect to the bottom wall 18, so that the sound wave reflected by the projection
30 can be prevented from directly returning to the speaker unit 2 as it is.
[0039]
Therefore, unnecessary interference of sound waves in the air chamber 14 can be avoided, which
is an advantageous configuration for obtaining clear sound quality.
[0040]
The inventor prepared a general speaker device in which a three-way type speaker unit was
attached to a box-like speaker housing, and the speaker device 1 having the above configuration,
and conducted a test to evaluate each volume characteristic. .
[0041]
In this test, frequency characteristics in a sound range of 8 kHz or less were measured in each of
the two types of speaker devices under the condition that the measurement environment is the
same.
The speaker device 1 according to the present invention uses the speaker housing 3 having a
diameter of 13 cm and a total length of 26 cm, and the width dimensions W1 and W2 of the first
and second resonance ducts 22 and 28 set to 5 mm. A full-range speaker unit with an aperture of
8 cm is used as 2.
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11
[0042]
FIG. 5 shows the frequency characteristics of a general speaker device as a comparative example.
As is apparent from FIG. 5, in the general speaker device, the flat characteristic is obtained in the
low range around 80 Hz to 150 Hz and the low low range sound of 50 Hz or less is obtained
unless the electrical amplification process is performed. The sense of volume tends to decrease
sharply.
[0043]
The human ear loses sensitivity to low and high range sounds when the volume is low. Therefore,
even if the frequency characteristic of the speaker device is flat, for example, when the sound
emitted by the speaker device is heard indoors, an impression of a particularly low-range sound
may be unsatisfactory.
[0044]
6 shows the frequency characteristic of the speaker device 1 according to the present invention.
As can be seen from FIG. 6, in the speaker device 1 having the speaker housing 3 in which the
first and second resonance ducts 22 and 28 are disposed around the air chamber 14, especially
in the frequency range around 50 Hz and 200 Hz, Loudness of the low-range sound is greatly
improved compared to the conventional speaker device. Furthermore, even in the frequency
range around 100 Hz, the volume of low-range sound is increased compared to a general speaker
device.
[0045]
The reason is that the second resonance duct 28 surrounding the air chamber 14 is ring-shaped,
and the width dimension W2 of the second resonance duct 28 is 5 mm which is the optimum
value in terms of the capacity of the air chamber 14. It is thought that this is because the
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12
expansion of the sound in the direction of the low range acted. At the same time, as the first
resonance duct 22 connecting the air chamber 14 of the speaker housing 3 and the second
resonance duct 28 advances outward in the radial direction of the speaker housing 3, the crosssectional area slightly expands. It is considered that this is because the effect of amplification is
given.
[0046]
Furthermore, although the second resonance duct 28 has a ring shape, in terms of the crosssectional area derived from the diameter and the total length of the speaker housing 3, it
becomes a considerably thick form as a passage for bass reflex. The second resonance duct 28 of
the first embodiment has a width dimension W2 of 5 mm, so the cross-sectional area of the
second resonance duct 28 is the cross-sectional area of a circular bass reflex port having a
diameter of about 5 cm. It is equivalent to
[0047]
Generally, when the bass reflex port is thick, although the volume of the low-range sound
increases, depending on the balance with the capacity of the air chamber 14, the mid-range
sound comes out of the bass reflex port, and the presence of this mid-range sound There is a
possibility that the volume of low-range sounds may be cancelled.
[0048]
However, in the first embodiment, by making the second resonance duct 28 in a ring shape
surrounding the air chamber 14, when the sound of the middle zone passes through the second
resonance duct 28, the sound of this middle zone is generated. Can be muted.
As a result, the volume of the low range sound coming out of the second resonance duct 28 is
not canceled out, and the full effect of the thick second resonance duct 28 having a large crosssectional area is fully utilized to obtain the low range sound. It can increase the sense of volume.
[0049]
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13
In addition, according to the first embodiment, the first and second resonance ducts 22 and 28
for enhancing low-pass sound are coaxially combined with the inner case 8 and the outer case 9.
It is formed between. Therefore, the first and second resonance ducts 22 and 28 do not protrude
largely in the axial direction from the end of the speaker housing 3, and the speaker housing 3
can be formed compact. As a result, when installing the speaker device 1, it is possible not only
to require a large space but also to improve the appearance of the speaker housing 3 and to
increase the commercial value.
[0050]
Also, by incorporating a large-sized speaker unit having a large aperture into the speaker housing
3 and determining the width dimensions of the first and second resonance ducts 22 and 28 of
the speaker housing 3 from the Helmholtz resonance formula, 50 Hz or less It is possible to
secure the sense of volume and the expansion of the sound even in the deep bass region of
[0051]
Furthermore, according to the first embodiment, the sound emission port 28a serving as an
outlet for low-range sound emitted from the speaker unit 2 to the air chamber 14 has a speaker
housing so as to surround the speaker unit 2 coaxially. It opens toward the front of 3.
For this reason, the low frequency sound is emitted from the periphery of the speaker unit 2 to
the front of the speaker housing 3, and the low frequency to mid frequency and high frequency
sounds are at the same location centered on the speaker unit 2. Released from
[0052]
Therefore, the sound sources from the low band to the high band are concentrated around the
speaker unit 2, and an ideal point sound source can be realized. Specifically, if the speaker device
1 is embedded in the ceiling of a room, it is possible to reproduce a sound that spreads
omnidirectionally throughout the room. Therefore, combined with the fact that the presence and
the volume of the low frequency sound can be secured by the presence of the first and second
resonance ducts 22 and 28, it is possible to obtain the nondirectional speaker device 1 with high
sound quality.
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14
[0053]
The present invention is not limited to the first embodiment, and can be variously modified and
implemented without departing from the scope of the invention.
[0054]
For example, in the first embodiment, the bottom wall of the outer housing is formed with a
conical protrusion projecting toward the opening of the inner housing, but this protrusion is not
an essential component and is omitted. May be
In this case, the inner surface of the bottom wall facing the opening may be flat, but the inner
surface of the bottom wall may be provided with a plurality of irregularities by roughening the
inner surface of the bottom wall.
[0055]
According to this configuration, when the sound wave emitted from the speaker unit to the air
chamber is reflected on the bottom wall, the reflection direction of the sound wave becomes
nonuniform due to the presence of the unevenness, and the sound wave reflected on the bottom
wall is straight as it is Can be prevented from returning to the speaker unit.
[0056]
As a result, unnecessary interference of sound waves inside the air chamber can be avoided, and
clear sound quality can be obtained.
[0057]
Furthermore, as shown by a two-dot chain line in FIG. 2, the radially inner side of the inner case
8 as the rear half portion near the opening 15 of the peripheral wall 10 of the inner case 8 facing
the air chamber 14 approaches the opening 15 The inner surface of the peripheral wall 10 may
be continuous with the opening edge of the opening 15.
[0058]
In addition, when the overall length of the speaker housing 3 is equal to or smaller than the
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diameter, for example, the screw 20 straddling between the bottom wall 18 of the outer housing
9 and the second end wall 12 of the inner housing 8. The outer housing 9 and the inner housing
8 can be coaxially fixed only with one another.
Therefore, the other spacer 25 interposed between the peripheral wall 10 of the inner housing 8
and the peripheral wall 17 of the outer housing 9 can be omitted, and the second resonance duct
28 is continuous in the circumferential direction over the entire length. It becomes a shape that
Therefore, the sound passing through the second resonance duct 28 can be emitted more evenly,
and the distortion of the sound can be completely eliminated.
[0059]
FIG. 7 discloses a second embodiment of the present invention.
[0060]
The second embodiment shows an example in which the speaker device 1 is installed horizontally
on the installation surface G.
As shown in FIG. 7, a pair of bosses 41 a and 41 b is attached to the outer peripheral surface of
the peripheral wall 17 of the outer housing 9.
The bosses 41 a and 41 b are supported on the outer peripheral case 17 by the outer casing 9
via screws 26 respectively. Therefore, the bosses 41 a and 41 b protrude outward in the radial
direction of the outer housing 9 from two places separated in the circumferential direction of the
peripheral wall 17.
[0061]
Legs 33 are attached to the projecting ends of the bosses 41a and 41b, respectively. The legs 33
touch the installation surface G and cover and hide the head of the screw 26.
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[0062]
8 and 9 disclose a third embodiment of the present invention.
[0063]
In the third embodiment, the shape of the outer casing 50 of the speaker casing 3 is different
from that of the first embodiment, and the configuration of the other speaker casing 3 is the first
embodiment. Is the same as
Therefore, in the third embodiment, the same components as those in the first embodiment are
denoted by the same reference numerals, and the description thereof is omitted.
[0064]
FIG. 8 is a front view of the speaker device 1 as viewed from the direction of the speaker unit 2.
As shown in FIG. 8, the outer casing 50 is in the shape of a rectangular tube having four outer
circumferential surfaces 51 a, 51 b, 51 c, and 51 d orthogonal to each other. The inner
circumferential surface 52 of the outer housing 50 is formed in a cylindrical shape, and coaxially
surrounds the peripheral wall 10 of the inner housing 8.
[0065]
Furthermore, the outer casing 50 of the present embodiment is configured by stacking a plurality
of square substrates 53 in the axial direction. As shown in FIG. 9, the substrate 53 has a circular
through hole 54. The through holes 54 are coaxially continuous when the substrates 53 are
stacked, and the inner peripheral surface 52 of the outer casing 50 is formed by the inner
surfaces 54 a of the through holes 54.
[0066]
In the practice of the present invention, the cross-sectional shape of the second resonance duct
along the radial direction of the speaker housing is not limited to a ring, and may be a square
having a plurality of corners.
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17
[0067]
FIG. 1 is a perspective view of a speaker device according to a first embodiment of the present
invention.
FIG. 1 is a cross-sectional view of a speaker device according to a first embodiment of the present
invention. FIG. 3 is a cross-sectional view taken along line F3-F3 of FIG. 2; FIG. 1 is a front view of
a speaker device according to a first embodiment of the present invention. The figure which
shows the frequency characteristic of the 8 kHz or less sound range of the speaker apparatus as
a comparative example in the 1st Embodiment of this invention. The speaker apparatus which
concerns on the 1st Embodiment of this invention WHEREIN: The figure which shows the
frequency characteristic of the 8 kHz or less sound range. The speaker apparatus which concerns
on the 2nd Embodiment of this invention WHEREIN: The front view which fractures | ruptures
and shows one part of the speaker housing | casing. The front view of the speaker apparatus
which concerns on the 3rd Embodiment of this invention. (A) is a front view of a substrate which
constitutes a speaker case. (B) is a side view of a substrate which constitutes a speaker case.
Explanation of sign
[0068]
DESCRIPTION OF SYMBOLS 1 ... Speaker apparatus, 2 ... Speaker unit, 3 ... Speaker housing |
casing, 8 ... inner housing | casing 9, 9, 50 ... outer housing | casing 12 ... end wall (2nd end wall),
13 ... attachment part (speaker attachment hole) 14; air chamber, 15: opening, 18: bottom wall,
22: first resonance duct, 28: second resonance duct.
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