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JP2006229731

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JP2006229731
The present invention provides a directional microphone in which a plurality of primary sound
pressure gradient type microphone units are accommodated independently while realizing
reduction of the overall weight and compactification of the overall shape at the same time. Kind
Code: A1 A microphone case comprising at least a microphone case which doubles as an acoustic
tube, and two or more microphone units having a front acoustic terminal and a rear acoustic
terminal and housed in the microphone case. Each of the microphone units 22 whose front
acoustic terminal 22a is located on the front side while covering the through holes 14 provided
in the peripheral wall portion 12 with the acoustic resistance material 16 is in the rear end
portion 12a of the microphone case 12 An air gap 24 is interposed between the case 12 and the
inner circumferential surface 13 of the case 12 so as to be adjacent to each other. [Selected
figure] Figure 1
Narrow directional microphone
[0001]
The present invention relates to a narrow directional microphone incorporating a plurality of
microphone units having a front acoustic terminal and a rear acoustic terminal.
[0002]
For microphones used in places that are particularly important such as conferences and
broadcast stations, there is also a need to respond to interruptions in sound due to breakdowns
and to separately connect to devices for loud-sounding and devices for recording, etc. There are
many examples where a plurality of microphones are installed at a predetermined position such
as a forest.
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1
[0003]
In this case, a large number of microphones line up in front of the speaker, which makes it
difficult to secure an installation space for the microphone and makes it difficult for the speaker
to see visually.
[0004]
For this reason, among the conventional microphones, high sensitivity microphone units are
incorporated independently into two or three systems in one head to reduce the installation
number as much as possible, to secure the installation space and visually confirm the speaker
Some have made it easier to
[0005]
On the other hand, there are narrow directional microphones in which an acoustic tube is
attached to the front acoustic terminal side of a microphone unit having a front acoustic terminal
and a rear acoustic terminal to narrow the directivity. As microphones, those of various
structures have been conventionally proposed, including those disclosed in Patent Document 1
below, for example.
Japanese Patent Application Laid-Open No. 62-118698
[0006]
By the way, in the field of narrow directional microphones, a narrow directional microphone
provided with a microphone unit having a front acoustic terminal and a rear acoustic terminal is
contained in one microphone case unlike the above-mentioned microphone used for a conference
etc. There is no example in which a microphone main body provided with a plurality of system
independent structures formed by accommodating a plurality of devices is provided.
[0007]
FIG. 2 is an explanatory view showing an arrangement relationship assuming a state in which
two systems of narrow directional microphones independent of each other are accommodated in
one microphone case to form a microphone main body.
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2
[0008]
In this case, each narrow directional microphone 3 has a microphone unit 4 having a front
acoustic terminal 4a and a rear acoustic terminal 4b, as is also apparent from Patent Document
1, and the rear of the acoustic tube 5 on the front acoustic terminal 4a side. It is formed by
attaching the end under sealing condition.
Further, the acoustic tube 5 is provided with a slit hole 6 in the peripheral wall portion, and the
slit hole 6 is covered with an acoustic resistance material 7 so as to obtain narrow directivity.
[0009]
As shown in FIG. 2, the narrow directional microphone 3 formed in this manner is housed in two
microphones 2 in a single microphone case 2 so that the microphone main body 1 can It will be
formed.
[0010]
Moreover, in this case, each of the two narrow directional microphones 3 has a space t in the
microphone case 2 so that acoustic interference due to resonance or the like does not occur
between the acoustic tubes 5 and 5. It is necessary to arrange.
[0011]
For this reason, the microphone main body 1 not only enlarges the shape of the microphone case
2 itself as shown in FIG. 2, but also accommodates the two sound tubes 5 made of a metal
material, so that the entire weight thereof is Will also increase.
Therefore, when the microphone main body 1 having such a structure is temporarily attached to
a flexible pipe (not shown) used as a support, the flexible pipe can not bear its weight and is
dulling so that the microphone main body 1 There will be a disadvantage that it will not be
possible to adjust the movement to the desired position.
[0012]
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SUMMARY OF THE INVENTION In view of the above problems of the prior art, the present
invention simultaneously realizes reduction of overall weight and compactification of the overall
shape even when a plurality of independent microphone units having front acoustic terminals
and rear acoustic terminals are accommodated. The purpose is to provide a narrow directional
microphone that can
[0013]
The present invention has been made to achieve the above object, and it is a microphone case
that doubles as an acoustic tube, and two or more microphone units that have a front acoustic
terminal and a rear acoustic terminal and are housed in the microphone case. And at least one of
the microphone units whose front acoustic terminal side is located on the front side are covered
in the rear end portion of the microphone case while the through holes provided in the
peripheral wall portion of the microphone case are covered with the acoustic resistance material.
The most important feature is that they are disposed adjacent to each other with an air gap
between them and the inner peripheral surface of the microphone case.
[0014]
According to the present invention, a narrow directional microphone is formed by
accommodating a microphone unit having a front acoustic terminal and a rear acoustic terminal
in a microphone case which also serves as an acoustic tube under two or more system
independent states. Can.
Therefore, the narrow directional microphone can realize the reduction of the overall weight and
the reduction of the overall shape at the same time by eliminating the need for the acoustic tube
itself.
[0015]
Therefore, when the narrow directional microphone is used as the sound collection unit, it can be
used stably while appropriately adjusting the position of the flexible pipe, assuming that the
support pipe supporting the narrow directional microphone as the stand arm is a flexible pipe.
[0016]
FIG. 1 is an enlarged cross-sectional view showing an example of the present invention, and the
entire narrow directional microphone 11 has a microphone case 12 also serving as an acoustic
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tube, a front acoustic terminal 22a, and a rear acoustic terminal 22b. 12, at least two microphone
units 22 accommodated in the housing 12.
[0017]
Among them, a metal material such as aluminum is used for the microphone case 12 of an
appropriate length, and both ends in the axial direction are opened, and it is determined by the
relationship between the outer diameter of the microphone unit 22 accommodated and the
number of housings. It is formed in a cylindrical shape with an appropriate diameter.
[0018]
Further, the microphone case 12 has narrow directivity such that slit holes 15 are arranged in
parallel at intervals of, for example, 90 degrees in the circumferential direction toward the
longitudinal direction of the peripheral wall portion orthogonal to the circumferential direction.
Are formed separately as through holes 14 for acoustic resistance to obtain.
[0019]
In addition, the slit hole 15 is covered by sticking the acoustic resistance material 16 made of
nylon mesh, non-woven fabric, or the like from the inner side surface 13 side of the microphone
case 12.
[0020]
The microphone unit 22 is a primary sound pressure gradient type having a front acoustic
terminal 22a and a rear acoustic terminal 22b, and the front acoustic terminal 22a is positioned
on the front side (left side in the illustrated example) to make the microphone case 12 Two are
accommodated in the rear end 12a.
[0021]
In this case, the two microphone units 22 are arranged adjacent to each other in the microphone
case 12 under the condition where their outer peripheral surfaces 23 contact with each other.
Moreover, each microphone unit 22 is accommodated under the condition that the air gap 24 is
formed between the outer peripheral surface 23 and the inner side surface 13 of the microphone
case 12.
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[0022]
Further, each microphone unit 22 is stably held in the rear end portion 12a of the microphone
case 12 in a state where it is held by the support side as a stand arm (not shown) connected with
the rear end side of the microphone case 12 It will be accommodated.
Furthermore, each microphone unit 22 can be fixedly disposed via an elastic material such as
rubber that partially intervenes with the microphone case 12 to form an air gap 24.
[0023]
Next, the operation of the present invention having the above configuration will be described.
Each microphone unit 22 has a function as an acoustic tube in the microphone case 12 in which
the slit hole 15 is closed by the acoustic resistance material 16. Can be used as a two-system
independent narrow directional microphone 11 in its entirety.
[0024]
In this case, since an acoustic pipe as shown in FIG. 2 is not connected to each microphone unit
22, even if the microphone units 22 and 22 are arranged adjacent to each other so that their
respective outer peripheral surfaces 23 contact each other, Because the overall shape itself is
small, acoustic interference such as resonance does not occur.
[0025]
Therefore, the narrow directional microphone 11 can realize the reduction of the overall weight
and the reduction of the overall shape at the same time by eliminating the need for the acoustic
tube itself.
[0026]
Therefore, in the case where the narrow directional microphone 11 is used as a sound collection
unit, it is assumed that a support pipe (not shown) supporting the microphone as a stand arm is a
flexible pipe, which differs from that shown in FIG. It can be used stably while adjusting.
[0027]
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The above has described the present invention based on the illustrated examples, and the specific
configuration thereof is not limited to this.
For example, three or more microphone units 22 can be accommodated in the microphone case
12 as desired.
Further, the through hole 14 provided in the microphone case 12 is formed by a large number of
circular holes, a large number of long holes, or the like other than the slit hole 15 shown in FIG.
It may be
Also, the acoustic resistance material 16 may cover the through hole 14 from the outside of the
microphone case 12.
[0028]
An expanded sectional view showing an example of the present invention.
Explanatory drawing which showed the arrangement | positioning relationship supposing the
state made into the microphone main body by accommodating two systems independent narrow
directivity microphones in one microphone case.
Explanation of sign
[0029]
11 Narrow directional microphone 12 Microphone case 12a Rear end 13 Inner side 14 Through
hole 15 Slit hole 16 Acoustic resistance material 22 Microphone unit 22a Front acoustic terminal
22b Rear acoustic terminal 23 Outer circumferential surface 24 Air gap
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