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JP2006295438

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DESCRIPTION JP2006295438
PROBLEM TO BE SOLVED: To easily align the acoustic resistance material from the inside of an
acoustic pipe to the acoustic opening of the acoustic pipe via a double-sided adhesive tape having
an opening. SOLUTION: A double-sided body comprising a cylindrical body mounted on the tip
end side of a microphone unit 14 and having substantially the same shape and size of the
openings 21a and 21b in the acoustic openings 15a and 15b formed on the side walls thereof In
the method of manufacturing the acoustic tube 10 in which the acoustic resistance material 22 is
attached from the inside of the cylindrical body via the adhesive tape 21, the laminate 20 in
which the acoustic resistance material 22 is attached to the double-sided adhesive tape 21 is a
double-sided adhesive tape 21. When pasting to the acoustic openings 15a and 15b from the
inside of the cylindrical body via the other adhesive surface, the other adhesive surface side of
the double-sided adhesive tape 21 is provided with an alignment mark for the acoustic opening,
The marks enable the positions of the openings 21a and 21b of the double-sided adhesive tape
21 and the openings 15a and 15b for sound to be aligned. [Selected figure] Figure 1
Method of manufacturing acoustic tube for narrow directional microphone
[0001]
The present invention relates to a method of manufacturing an acoustic tube for a narrow
directional microphone, and more particularly, to a technique for adhering an acoustic resistance
material to an opening formed in a side wall of the acoustic tube.
[0002]
03-05-2019
1
Among narrow directional microphones, in microphones having a small aperture, a cylindrical
acoustic tube is used for the outer casing of the microphone.
The length of the acoustic tube is determined by the lowest frequency at which a particular
directivity is desired, so the size of the side wall of the acoustic tube is appropriate so that the
acoustic tube is acoustically short at high frequencies. An acoustic opening (for example, a slitlike opening) is formed, and an acoustic resistance material having a predetermined acoustic
resistance is attached to the acoustic pipe so as to cover the acoustic opening.
[0003]
A cloth, a mesh or a non-woven fabric is used as the acoustic resistance material. However, when
the acoustic resistance material is attached to the outside of the acoustic tube, the appearance is
impaired. As described in Patent Document 1, the acoustic resistance material is used. It is stuck
on the inside of the acoustic tube.
[0004]
In that case, double-sided adhesion (adhesion in most cases, for example, because it is difficult to
check the application condition of the adhesive material, by the method of applying the adhesive
material (adhesive material) in the acoustic pipe with a brush etc. ) I use a tape.
[0005]
That is, an opening corresponding to the opening for acoustics is formed in the double-sided
adhesive tape, an acoustic resistance material is attached to one of the adhesive surfaces, and
this is put in an acoustic tube. After visually aligning the opening with the opening, the acoustic
resistance material is pasted into the acoustic pipe via the double-sided adhesive tape.
[0006]
JP-A-4-139500 (FIG. 5)
[0007]
However, the acoustic opening provided in the acoustic tube is usually a slit-like opening of
about 0.5 mm, and since the base of the double-sided adhesive tape is almost transparent, the
opening of the double-sided adhesive tape and the acoustic opening There is a problem that
accurate alignment with a part is difficult in operation and requires skill.
03-05-2019
2
[0008]
Therefore, an object of the present invention is to open the acoustic opening of the double-sided
adhesive tape and the acoustic opening when attaching the acoustic resistance material from the
inside of the acoustic tube to the acoustic opening of the acoustic tube through the double-sided
adhesive tape having the opening. To facilitate the alignment with the
[0009]
In order to solve the above-mentioned subject, the invention according to claim 1 consists of a
cylindrical body attached to the tip side of a microphone unit, and the above-mentioned opening
for acoustics in the opening for acoustics formed in the side wall of the above-mentioned
cylindrical body In a method of manufacturing an acoustic tube for a narrow directional
microphone, wherein a predetermined acoustic resistance material is attached from the inside of
the cylindrical body via a double-sided adhesive tape having an opening substantially the same
shape and size as that of the part The double-sided adhesive is used to attach a laminate in which
the acoustic resistance material is attached to one of the adhesive surfaces of the cylindrical
adhesive from the inside of the cylindrical body through the other adhesive surface of the
double-sided adhesive tape. An alignment mark for the acoustic opening is provided on the other
adhesive surface side of the tape, the opening and the acoustic opening are aligned with the
mark, and the laminate is placed inside the cylindrical body. It is characterized in that the wear.
[0010]
The invention according to claim 2 is characterized in that, in the above-mentioned claim 1, the
above-mentioned mark is attached with a fugitive ink which disappears with time due to moisture
in the air.
[0011]
According to the first aspect of the present invention, the double-sided adhesive tape has an
alignment mark with respect to the acoustic opening, and the mark enables the opening of the
double-sided adhesive tape to be aligned with the acoustic opening. As a result, the opening of
the double-sided adhesive tape and the opening for sound can be accurately aligned without
requiring skill, and a narrow directional microphone with uniform quality can be provided.
[0012]
Further, according to the invention of claim 2, the mark is attached by the depleting ink which is
eliminated with time due to moisture in the air, so that the mark does not disappear after the
positioning operation and remains. , The appearance is not lost.
03-05-2019
3
[0013]
Next, an embodiment of the present invention will be described with reference to FIGS. 1 to 3,
but the present invention is not limited to this.
1 (a) is a side view showing an example of an acoustic tube manufactured according to the
present invention, (b) a sectional view taken along the line A-A, and FIG. 2 is a front view showing
an example of a double-sided adhesive tape used in the present invention, FIG. 3 is a perspective
view showing the double-sided adhesive tape and the acoustic resistance material separately.
[0014]
Referring to FIGS. 1 (a) and 1 (b), the acoustic tube 10 is in the form of a cylinder, and the
material thereof is usually made of metal such as aluminum or brass, but may be made of
synthetic resin.
The front end side (one end side) of the acoustic tube 10 is opened as the front acoustic terminal
11, but since the acoustic tube 10 in this example is for unidirectionality, on the rear end side
(the other end side) A single-directional condenser microphone unit 13 is accommodated on the
rear end side of the acoustic tube 10 via a shock mount member 14 made of a rubber elastic
material.
[0015]
The length of the acoustic tube 10 is determined by the lowest frequency at which a particular
directivity is desired, as described above, so that for high frequencies the acoustic tube length is
acoustically short. An acoustic opening for introducing a sound wave is formed on a side wall of
the acoustic tube 10, and an acoustic resistance material is attached to cover the acoustic
opening.
[0016]
03-05-2019
4
In the example of FIG. 1, two slit-like acoustic openings 15a and 15b are formed in a line along
the axial direction of the acoustic tube 10 in each of the left and right side walls of the acoustic
tube 10. In some cases, the acoustic opening may be formed on the side wall of the acoustic tube
10 so as to be orthogonal to the axial direction.
Usually, the width in the minor axis direction of the slit hole to be the opening for sound is about
0.5 mm.
[0017]
In bonding the acoustic resistance material from the inside of the acoustic tube 10 through the
double-sided adhesive tape to the acoustic openings 15a, 15b, as shown in FIG. 2, a double-sided
adhesive tape 21 having the openings 21a, 21b. Use
Acoustically, the openings 21a and 21b are preferably the same shape and size (substantially the
same) as the acoustic openings 15a and 15b.
In the present invention, the double-sided adhesive tape also includes a double-sided adhesive
tape.
[0018]
As shown in FIG. 3, the acoustic resistance material 22 is attached to one adhesive surface of the
double-sided adhesive tape 21 to form a laminate 20.
The acoustic resistance material 22 may be a cloth, a mesh (mesh material), a non-woven cloth,
or the like that is generally used.
At the actual product level, a double-sided adhesive tape may be NITTO # 532 manufactured by
Nitto Denko Corporation, and a sound resistance material may be nylon mesh # 508
manufactured by NBC.
03-05-2019
5
[0019]
As shown in FIG. 1 (b), the laminate 20 is inserted into the acoustic tube 10, and the openings
21a and 21b of the double-sided adhesive tape 21 are visually aligned with the openings 15a and
15b. Although the other opening of the double-sided adhesive tape 21 is attached to the inner
surface of the acoustic tube 10, the acoustic openings 15a and 15b are covered with the acoustic
resistance material 22, but the base of the double-sided adhesive tape 21 is Since it is
substantially transparent, the positions of the openings 21 a and 21 b are difficult to identify.
[0020]
Therefore, in the present invention, as shown in FIG. 2, a visible mark M is made by the ink
material on the openings 21a and 21b of the double-sided adhesive tape 21.
In this example, substantially circular marks M are attached to both ends of the openings 21a
and 21b, but marks M may be attached to the entire circumference of the openings.
[0021]
According to this, the positions of the openings 21a and 21b can be clearly read by the mark M,
and the openings 21a and 21b can be easily aligned with the acoustic openings 15a and 15b
using the marks as marks.
[0022]
For example, when the openings 21a and 21b of the double-sided adhesive tape 21 are slightly
smaller than the acoustic openings 15a and 15b, the alignment mark M appears in the acoustic
openings 15a and 15b. , The appearance may be impaired.
[0023]
In order to prevent this, it is preferable to draw the mark M with a fugitive ink which disappears
with time due to moisture in the air.
According to the fugitive ink, since the mark M disappears, the appearance is not impaired.
03-05-2019
6
[0024]
When the expendable ink is used, a colored mark M may be attached to the acoustic resistance
material 22 exposed in the openings 21 a and 21 b of the double-sided adhesive tape 21.
As a fugitive ink of this type, a product name Chaco Ace II (purple) (pink) manufactured by
Sodeyama Co., Ltd. and the like are commercially available.
[0025]
As described above, according to the present invention, since the acoustic resistance material can
be accurately attached to the acoustic opening of the acoustic tube from the inner surface side of
the acoustic tube, a narrow directional microphone with stable quality can be obtained. Can be
provided.
[0026]
The (a) side view which shows an example of the acoustic pipe manufactured by this invention,
(b) The AA sectional view taken on the line.
The front view which shows an example of the double-sided adhesive tape used by this invention.
The perspective view which isolate | separates and shows a double-sided adhesive tape and an
acoustic resistance material.
Explanation of sign
[0027]
DESCRIPTION OF SYMBOLS 10 Acoustic pipe 11 Front acoustic terminal 12 Rear acoustic
terminal 13 Condenser microphone unit 15a, 15b Opening for sound 20 Layered body 21
03-05-2019
7
Double-sided adhesive tape 21a, 21b Opening 22 Sound resistance material M Mark for
alignment
03-05-2019
8
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