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JP2012169886

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DESCRIPTION JP2012169886
A microphone capable of easily changing the direction of a pointing axis from the outside is
obtained. SOLUTION: A case having a sound collecting unit 21 and a microphone unit provided
inside, a cap 3 which covers the sound collecting unit 21 and is rotatably covered on the case,
and a cord 22 drawn out of the case And a microphone. The cap 3 has a plurality of sound
collecting holes 31, and the plurality of sound collecting holes 31 are opened in different
directions, respectively, and are in communication with the sound wave introducing portion of
the microphone unit. [Selected figure] Figure 1
マイクロホン
[0001]
The present invention relates to a microphone capable of easily changing the direction of the
pointing axis from the outside.
[0002]
In the case of using a directional microphone, the microphone is installed such that the
directional axis of the microphone unit inside the microphone is directed to the sound source, in
order to perform optimal sound collection.
Since the pointing axis of the microphone unit is often directed to the front of the microphone,
when the pointing axis is directed to the sound source, the microphone is installed so that the
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front of the microphone faces the sound source and the cord is opposite to the direction of the
sound source It pulls out to the side (refer to patent documents 1).
[0003]
FIG. 5 shows a conventional example of a microphone whose directional axis is directed to the
front. In the conventional microphone 1 ', a sound collecting unit 21 is provided on the front end
side of the microphone body 2, and a cord 22 is drawn out from the rear end side. The sound
collecting unit 21 includes a front sound collecting unit 21 a provided at the front end of the
microphone main body 2 and a peripheral sound collecting unit 21 b provided at a side wall near
the front sound collecting unit 21. The main body 2 is directed to the front.
[0004]
In this way, in the microphone 1 ′ in which the code 22 is drawn to the side opposite to the
direction of the sound source, when such a microphone is used to collect the voice of the speaker
who is the sound source in video broadcasting such as television. While the front of the
microphone is directed toward the speaker, the cord is drawn out long to the photographing
device side, and the cord is reflected in the image, and the appearance of the image is impaired.
When a boundary microphone is installed on a desk for use in a news program or the like, a code
may be pulled out from the rear end of the housing of the boundary microphone, and this code
may be reflected in an image.
[0005]
Therefore, in the case of using the above-described microphone, in order to prevent the wiring
from being reflected in the image, it is required to wire the cord toward the sound source side.
[0006]
JP, 2006-148325, A
[0007]
Therefore, there is a microphone which can be attached by changing the direction of the
microphone unit by 180 degrees without changing the direction of pulling out the cord so that
the direction of the directional axis of the microphone unit and the direction of drawing out the
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cord are the same.
[0008]
In such a microphone, since the microphone unit is fixed inside the microphone, when changing
its direction, it is necessary to remove the screw of the housing and take out the built-in parts
mainly composed of the microphone unit.
This operation is complicated, and the user must touch the microphone unit, and the operator's
hand or tool may come in contact with the electronic board or wiring around the microphone
unit during the operation. Could be
[0009]
Therefore, there is a microphone in which only the cord extraction direction can be arbitrarily
changed without changing the direction of the microphone unit.
Such a microphone can prevent the above-mentioned failure since it is not necessary to directly
touch the microphone unit.
However, in order to meet the demand for strong radio frequency interference (RFI) resistance to
microphones accompanying the widespread use of mobile phones in recent years, it is preferable
to adopt a caulking structure to a housing etc. It is difficult to adopt a caulking structure.
[0010]
On the other hand, if the microphone has a caulking structure, it can not be configured such that
the microphone cord can be pulled out in any direction.
[0011]
Also, some microphones are used by being embedded in a ceiling or desk with holes.
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Such a microphone is fixed in such a manner that the pointing axis is directed to the sound
source, but it becomes very difficult to change the direction of the pointing axis after being fixed
once.
[0012]
The present invention solves the problems of the prior art as described above, that is, a
microphone which can change the directional axis without touching the microphone unit and
which can adopt an RFI resistant corresponding structure such as a caulking structure. Intended
to provide.
[0013]
A microphone according to the present invention includes a case having a sound collecting unit,
in which a microphone unit is provided, a cap that covers the sound collecting unit and is
rotatably covered on the case, and a cord drawn from the case The cap has a plurality of sound
collecting holes, and the plurality of sound collecting holes are respectively opened in different
directions and are in communication with the sound wave introducing portion of the microphone
unit.
[0014]
The present invention can change the directional axis without touching the microphone unit only
by changing the rotational position of the cap with respect to the housing, so that it is possible to
easily change the direction of the directional axis even if embedded in a wall surface etc. It is
possible to provide a microphone that can also adopt an RFI-resistant structure such as a
structure.
[0015]
It is a sectional view showing an example of a microphone concerning the present invention.
The cap in the said Example is shown, (A) is a longitudinal cross-sectional view, (B) is a crosssectional view taken along line A-A of (A), (C) is taken along line B-B of (A) FIG.
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FIG. 2A is a cross-sectional view and a directivity characteristic diagram showing a method of
adjusting the orientation of the directivity axis of the microphone of FIG. 1;
It is sectional drawing which shows the case where it embeds in the wall surface and uses the
microphone of FIG. 1 as a boundary microphone. It is a side view showing a conventional
microphone.
[0016]
Hereinafter, embodiments of the microphone according to the present invention will be described
with reference to the drawings.
[0017]
As shown in FIG. 1, the microphone 1 according to the present invention includes a microphone
body 2 and a cap 3.
[0018]
The microphone body 2 is configured in the same manner as the conventional microphone 1
'shown in FIG.
The microphone main body 2 includes a microphone unit (not shown) inside the substantially
cylindrical housing, and a sound collecting unit 21 for guiding the voice from the outside to the
microphone unit inside the housing at the tip of the housing. Is provided.
In addition, a cord 22 is drawn out from the end opposite to the side where the sound collection
unit 21 is provided. The sound collecting unit 21 includes a front sound collecting unit 21 a
provided at the front end of the microphone body 2 and a peripheral sound collecting unit 21 b
provided on a side wall near the front sound collecting unit 21 a. The electro-acoustic conversion
system of the microphone unit is optional, and for example, a condenser microphone unit may be
adopted. The directivity characteristic of the microphone unit is unidirectional.
[0019]
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The cap 3 is a hollow cylindrical bottomed cylindrical member that covers the front surface of
the sound collecting unit 21 of the microphone body 2 and is rotatably covered with the
microphone body 2. The cap 3 is provided with a sound collecting hole 31 for guiding a sound
from the outside to the sound collecting unit 21 of the microphone main body 2 and an insertion
hole 32 for inserting the microphone main body 2. In the present embodiment, the sound
collecting hole 31 is constituted by two sound collecting holes 31a and 31b.
[0020]
The sound collecting holes 31a and 31b are opened in different directions, and are in
communication with the sound wave introducing portion of the microphone unit through the
insertion hole 32. The sound collecting holes 31a and 31b are at positions different from each
other by 180 degrees when viewed from the axial direction of the cap 3, respectively, on
different planes perpendicular to the axial direction, and substantially perpendicular to the sound
collecting axis D of the microphone body 2. It is formed towards.
[0021]
The sound collecting hole 31a is located on the tip end side of the microphone 1 relative to the
other sound collecting holes 31b, and the sound of the insertion hole 32 is guided from the
outside of the cap 3 to the front sound collecting portion 21a of the microphone main body 2. It
is formed to communicate around the bottom. FIG. 2B is a cross-sectional view of a portion of the
sound collection hole 31 a taken along a plane AA perpendicular to the axial direction of the cap
3. As shown in FIG. 2 (B), the sound collection holes 31a are formed such that the opening
becomes wider as going from the inside to the outside of the cap 3 to enable sound collection
over a wide range.
[0022]
The sound collecting hole 31b is located on the rear end side of the microphone 1 with respect to
the sound collecting hole 31a, and is an opening of the insertion hole 31 so as to guide the sound
from the outside of the cap 3 to the peripheral sound collecting unit 21b of the microphone main
body 2. It is formed to communicate with the vicinity of the part. FIG. 2C is a cross-sectional view
of the sound collection hole 31 b in the plane perpendicular to the axial direction of the cap 3
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taken along the line B-B. As shown in FIG. 2C, the sound collection holes 31b are formed such
that the opening becomes wider as going from the inside to the outside of the cap 3 to enable
sound collection over a wide range.
[0023]
As shown in FIG. 2A, the microphone 1 provided with the cap 3 described above has an acoustic
center point in the central portion near the entrance of the sound collection hole 31 a of the cap
3. This acoustic center point is referred to as the front acoustic terminal T1. Similarly, an acoustic
center point is provided in the central portion near the entrance of the sound collection hole 31b,
and this acoustic center point is referred to as a rear side acoustic terminal T2. The sound
pressure difference between the acoustic terminals T1 and T2 determines the directional axis of
the microphone 1. The directional axis is in the direction of the line connecting the acoustic
terminals T1 and T2. Since the acoustic terminals T1 and T2 are shifted back and forth in the
longitudinal direction of the microphone 1, the directional axis of the microphone 1 is not exactly
orthogonal to the original directional axis of the microphone 1, but the shift can be small. Can be
considered orthogonal. Therefore, the directional axis of the microphone 1 provided with the cap
3 is substantially in the direction indicated by the arrow D in FIG. This pointing axis largely
depends on the direction of the sound collecting hole 31a in the present embodiment. Therefore,
as shown in FIG. 3, by rotating the cap 3, the direction of the sound collection hole 31 a can be
easily changed, and the direction of the directional axis can be changed.
[0024]
When the microphone unit is unidirectional, the diameter of the cap 3 is changed to reduce the
linear distance d connecting the front and rear acoustic terminals T1 and T2 (see FIG. 2A). When
d is increased, the directivity becomes close to sharp directivity.
[0025]
In the invention, the position of the sound collection hole 31 may be one or three or more, and
the position of the sound collection hole 31 may be appropriately adjusted.
By appropriately adjusting in this manner, the degree of freedom in adjusting the directivity can
be increased.
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[0026]
The microphone according to the present invention can also be suitably used as an embedded
boundary microphone used by being embedded in a ceiling, a wall surface, a top plate of a desk,
or the like.
[0027]
An example of such a boundary microphone is shown in FIG.
In FIG. 4, the microphone 1 is the same as the microphone 1 according to the above-described
embodiment, and is fixed in a state of being inserted into the insertion hole 41 of the wall 4 while
bringing the cap 3 out of the wall 4. In other words, the microphone 1 is embedded in the wall
surface 4 except for the sound collecting unit 21 of the microphone main body 2 and functions
as a boundary microphone.
[0028]
In conventional embedded boundary microphones, it is very difficult to change the direction of
the directivity axis after being fixed once. However, the boundary microphone according to the
present invention can easily change the direction of the pointing axis by rotating the cap 3.
[0029]
In addition, since the microphone according to the present invention does not need to change the
direction of the microphone unit inside the microphone body when adjusting the direction of the
directional axis, it is possible to adopt an RFI-resistant structure of the microphone body such as
a caulking structure. It is.
[0030]
DESCRIPTION OF SYMBOLS 1, 1 'Microphone 2 Microphone main body 21 Sound collection part
21a Front sound collection part 21b Peripheral sound collection part 22 Code 3 Cap 31 Sound
collection hole 32 Insertion hole 4 Wall surface 41 Insertion hole
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