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JP2017118372

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DESCRIPTION JP2017118372
Abstract: In a narrow directional microphone using a cylindrical acoustic tube, it is an object of
the present invention to prevent the infiltration of water to the microphone unit side even if the
acoustic tube is wet due to rain or the like. A sound tube base 2 having a cylindrical shape, the
sound tube base having at least one slit-shaped gap 10 extending along the longitudinal direction
of the sound tube base, A large number of short fibers 3 are flocked on the outer peripheral
surface of the acoustic tube base and the end face of the base forming the gap, and the gap is
covered by the short fibers. [Selected figure] Figure 1
Acoustic tube and narrow directional microphone using the same
[0001]
The present invention relates to an acoustic tube and a narrow directional microphone using the
acoustic tube, and more particularly to an acoustic tube capable of preventing the ingress of
water and a narrow directional microphone using the acoustic tube.
[0002]
A narrow directional microphone with an acoustic tube couples the acoustic tube to the front of
the microphone unit and is sealed so that sound waves do not enter from this coupling part.
Although such a configuration achieves narrow directivity, there is a problem that the influence
of the proximity effect is high when the influence of wind noise and the sound source are close.
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[0003]
In order to solve the above-mentioned problems, the applicant of the present application, in
Patent Document 1, provides a plurality of openings (sound introduction ports) in the tube wall
of an acoustic tube (aluminum tube) accommodating a microphone unit. The structure which
affixed acoustic resistance (cloth, a nonwoven fabric etc.) to the part is disclosed. According to
the configuration disclosed in Patent Document 1, wind noise and proximity effect can be
reduced as compared with the conventional narrow directional microphone.
[0004]
Patent No. 2562295 gazette
[0005]
By the way, the narrow directional microphone as described above is often used outdoors
because it can pick up a target sound source by eliminating ambient noise.
However, in the structure provided with a large number of openings in the tube wall of the
acoustic tube as disclosed in Patent Document 1, when the acoustic tube gets wet due to rain or
the like, the acoustic resistance material attached to the aperture of the tube wall However, there
is a problem that water infiltrates into the inside of the tube and causes a failure of the
microphone unit.
[0006]
The present invention has been made focusing on the above-mentioned points, and in a narrow
directional microphone using an acoustic tube, even if the acoustic tube gets wet due to rain or
the like, the intrusion of water into the housing space of the microphone unit is prevented. It is
an object of the present invention to provide an acoustic pipe that can be used and a narrow
directional microphone using the acoustic pipe.
[0007]
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In order to solve the problems described above, an acoustic tube according to the present
invention includes a cylindrical acoustic tube base, and the acoustic tube base is at least one
formed along the longitudinal direction of the acoustic tube base. A plurality of short fibers are
flocked on the outer peripheral surface of the acoustic tube base and the end face of the base
forming the gap, and the gap is covered by the short fibers. .
The acoustic tube base material can be divided into a plurality of base material parts by a
dividing line along the longitudinal direction of the pipe, and a large number of the outer surface
of each base material part and the base end face along the dividing line are provided. It is
preferable that a plurality of slit-like gaps covered with the short fibers be formed by flocking the
short fibers and bringing the end surfaces of the plurality of base parts into alignment with each
other.
[0008]
According to such a configuration, a slit-like gap is formed in the acoustic tube along the
longitudinal direction of the tube, and the short fiber covering the gap is configured to function
as an acoustic resistance material. In addition, since a large number of short fibers are implanted
on the outer peripheral surface of the acoustic tube, water is repelled on the outer peripheral
surface, and the gap is covered with the short fibers. It can be prevented.
[0009]
Further, in order to solve the above problems, in the narrow directional microphone according to
the present invention, a microphone unit that picks up sound, the acoustic tube on which the
microphone unit is mounted on the rear end side, and a plurality of openings formed on the
circumferential surface A cylindrical casing pipe for accommodating the acoustic pipe, and a
locking member for fixing the acoustic pipe in the pipe is provided between the casing pipe and
the acoustic pipe. . Preferably, the locking member is provided between one end side of the
casing pipe and one end side of the acoustic pipe.
[0010]
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According to such a configuration, the acoustic pipe is inserted into the casing pipe, and the
locking member is provided between the casing pipe and the acoustic pipe, whereby the short
fiber covering the gap is compressed, and the compression strength thereof is obtained. To make
the acoustic resistance in the gap adjustable. In addition, by providing a locking member between
the one end side of the casing tube and the acoustic tube, the gap gradually increases in size
from the one end side to the other end side of the acoustic tube. Size) changes. Thereby, an
acoustic pipe can be used like a horn whose diameter is expanded from one end side to the other
end side.
[0011]
Even if the acoustic tube gets wet due to rain or the like, it is possible to obtain an acoustic tube
capable of preventing the entry of water into the accommodation space of the microphone unit
and a narrow directional microphone using the acoustic tube.
[0012]
Fig.1 (a) is sectional drawing of the transversal direction of the acoustic pipe based on this
invention, FIG.1 (b) is sectional drawing of a longitudinal direction.
FIG. 2 is a cross-sectional view in the lateral direction of the base material part constituting the
acoustic tube of FIG. 1, and FIG. 2 (b) is a cross-sectional view in the longitudinal direction
thereof. FIG. 3 (a) is a cross-sectional view in the short direction of the base part in a state in
which short fibers are implanted into the base part constituting the acoustic tube of FIG. 1, and
FIG. 3 (b) is a longitudinal direction thereof FIG. FIG. 4 is a side view of a casing tube that can
accommodate the acoustic tube of FIG. 1; FIG. 5 is a longitudinal cross-sectional view of the
casing pipe in a state in which the acoustic pipe of FIG. 1 is accommodated. FIG. 6 is a crosssectional view of the casing tube in the lateral direction, in which the acoustic tube of FIG. 1 is
accommodated.
[0013]
Hereinafter, embodiments of the present invention will be described based on the drawings. Fig.1
(a) is sectional drawing of the transversal direction of the acoustic pipe based on this invention,
FIG.1 (b) is sectional drawing of a longitudinal direction. The sound tube shown in the figure is
connected at its rear end to the front sound terminal side of a microphone unit (not shown) and
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is used in cooperation with the microphone unit to achieve narrow directivity. Microphones are
configured. As shown in FIGS. 1 (a) and 1 (b), this acoustic tube 1 has a long cylindrical acoustic
tube base 2 made of, for example, a resin. A large number of short fibers (pile) are implanted on
the outer peripheral surface or the like of the acoustic tube base material 2.
[0014]
Specifically, the acoustic tube base 2 is, for example, divided into two by a dividing line along the
longitudinal direction of the tube as illustrated, and is configured by the base material part 2A
and the base material part 2B. The two divided base material parts 2A and 2B form a cylindrical
shape by the division surfaces 2A1 and 2B1 (base material end surfaces along the division lines)
facing each other. A short fiber (pile) 3 is implanted on the outer peripheral surfaces 2A2 and
2B2 and the divided surfaces 2A1 and 2B1 of the base material part 2A and the base material
part 2B. A slit-shaped gap 10 covered with the short fibers 3 is formed in a portion where the
divided surfaces 2A1 and 2B1 are combined (two gaps 10 are formed on both left and right). The
short fibers 3 provided in the gap 10 function as an acoustic resistance material.
[0015]
The procedure for producing this acoustic tube 1 will be described. A base material part 2A (2B)
having the cross section shown in FIGS. 2 (a) and 2 (b) is formed. Next, a large number of short
fibers (pile) 3 are formed on the outer surface 2A2 (2B2) of the base part 2A (2B) and the
dividing surface 2A1 (2B1), for example, by electrostatic flocking.
[0016]
This electrostatic flocking is performed, for example, in the following procedure. An adhesive is
previously applied to the surface of the base part 2A (2B) that requires flocking. The short fibers
3 to be implanted (adhered) are placed on an electrode plate (not shown), and a high DC voltage
is applied between the target surface and the electrode plate.
[0017]
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For example, when the anode (plus) potential is applied to the target surface and the negative
(minus) potential is applied to the electrode plate, polarization occurs in the short fibers 3. The
negatively charged short fibers 3 are attracted to the target surface and flocked. That is, as
shown in the cross-sectional view in the lateral direction of FIG. 3A and the cross-sectional view
in the longitudinal direction of FIG. 3B, the flocked state is mechanically retained by the curing of
the adhesive.
[0018]
When the above-mentioned electrostatic flocking is used, the top ends of the flocked short fibers
3 are made to have the same polarity (plus potential), so that the top ends of the respective short
fibers 3 have an action of repelling each other. The fibers 3 are flocked so as to stand vertically
to the flocked surface. The length of the short fibers 3 is preferably 0.2 to 2 mm. Moreover,
rayon, polyamide, polyester fiber etc. can be suitably utilized as a raw material of a staple fiber.
[0019]
Thus, base parts 2A and 2B as shown in FIGS. 3 (a) and 3 (b) are formed, and as shown in FIG. 1,
their divided surfaces 2A1 and 2B1 sandwich short fibers 3 therebetween. Can be combined. This
completes the cylindrical acoustic tube 1. According to the acoustic tube 1, since the short fibers
(pile) 3 are implanted on the outer peripheral surface, water can be repelled even if the outer
peripheral surface gets wet due to rain or the like. Furthermore, since the gap 10 is covered by
the short fibers (pile) 3, it is possible to prevent water from entering the tube from the gap 10.
[0020]
Further, as described above, since the acoustic tube 1 is a combination of the two base parts 2A
and 2B, a means for fixing them is necessary. In the present embodiment, a casing pipe 5 as
shown in FIG. 4 is used as the fixing means. The casing tube 5 is a cylindrical tube made of, for
example, resin and capable of containing the acoustic tube 1 and a plurality of openings 5a are
formed on the circumferential surface thereof along, for example, the longitudinal direction of
the tube.
[0021]
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When the acoustic pipe 1 is inserted into the casing pipe 5, the base material parts 2A and 2B
are simply integrated. In this state, the acoustic pipe 1 may not be fixed in the casing pipe 5.
Therefore, in the present embodiment, as shown in FIG. 5, a spacer (locking member) 6 is
disposed between the casing pipe 5 and the acoustic pipe 1. The spacer 6 may be cylindrical, but
may not be cylindrical. The plurality of spacers 6 may be partially arranged such that a pressing
force is applied in the direction in which at least the base parts 2A and 2B are in close contact
with each other. The spacers 6 not only fix the acoustic tube 1 in the tube but also compress the
short fibers 3 covering the gap 10. Therefore, by changing the compressive strength (pressure)
of the spacer 6, the spacer 6 enables adjustment of the acoustic resistance in the gap 10.
Moreover, since the magnitude of the acoustic resistance can be adjusted, the directivity angle of
the sound collection can be changed. In addition, as a material of the said spacer 6,
polycarbonate, ABS etc. can be used, for example.
[0022]
Further, as shown in the figure, the spacer 6 is provided only on one end side in the casing pipe 5
so that the gap 10 of the portion where the base parts 2A and 2B of the acoustic pipe 1 are
combined It is made to spread gradually towards the end side. As a result, the size of the acoustic
resistance can be gradually reduced from one end to the other end of the acoustic tube 1, and the
acoustic tube 1 can be used like a horn.
[0023]
As described above, since the casing pipe 5 is formed with a large number of openings 5a, the
influence of the casing pipe 5 on sound collection is greatly reduced. Further, even if water
intrudes from the opening 5 a of the casing pipe 5, the water is repelled on the outer surface of
the acoustic pipe 1 and the water is discharged from the opening 5 a, so water does not
accumulate in the casing pipe 5.
[0024]
As described above, according to the embodiment of the present invention, the acoustic tube 1
(acoustic tube base 2) is divided into two of the base parts 2A and 2B so that slits along the
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longitudinal direction of the tube can be obtained. A gap 10 is formed. The short fibers 3
covering the gap 10 function as an acoustic resistance material. Further, since a large number of
short fibers 3 are implanted on the outer peripheral surface of the acoustic tube 1, the acoustic
tube in the present embodiment repels water on the outer peripheral surface, and the gap 10 is
covered with the short fibers 3. Prevent the ingress of water inside the tube. Further, the acoustic
tube 1 is configured by inserting the two base parts 2A and 2B into the casing tube 5, and is
provided between the acoustic tube 1 at one end side of the casing tube 5 It is fixed in the casing
tube 5 by the locking member 6. As a result, the size of the gap 10 (the size of the acoustic
resistance) gradually changes from one end side to the other end side of the acoustic tube 1, so
that the diameter of the acoustic tube 1 expands toward the other end side. Act like.
[0025]
In the above embodiment, the slit-like gap 10 along the longitudinal direction of the tube is
formed by dividing the acoustic tube 1 into two, but in the present invention, the form is used. It
is not limited to For example, three or more slits 10 may be formed by the acoustic tube 1
divided into three or more. Alternatively, the acoustic tube 1 may not be divided, and one slit-like
gap 10 may be formed along the longitudinal direction of the acoustic tube 1.
[0026]
Moreover, in the said embodiment, although it was set as the structure which provides the spacer
6 between this casing pipe 5 and the acoustic pipe 1 in the one end part side of the casing pipe
5, it is limited to the form in this invention. It is not something to be done. For example, a spacer
6 is provided between the casing pipe 5 and the acoustic pipe 1 near the center of the casing
pipe 5, or at both ends of the casing pipe 5, etc., so that the short fibers 3 are compressed
substantially uniformly. 1 may be configured.
[0027]
Reference Signs List 1 acoustic tube 2 acoustic tube base 2A base part 2A1 split surface (base
end face) 2A2 outer peripheral face 2B base part 2B1 split surface (base end face) 2B2 outer
peripheral face 3 short fiber 5 casing tube 5a opening 6 spacer (engagement Stopper) 10 gap
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