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JP2005311428

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DESCRIPTION JP2005311428
PROBLEM TO BE SOLVED: To provide an underwater microphone capable of performing realistic
sound collection suitable for sound collection such as swimming competition and underwater
dance, for example, which does not need to be deeply sunk and collected in water. SOLUTION: In
an underwater microphone for picking up sound waves in water, a nondirectional microphone
unit 10 subjected to waterproofing treatment, and a cylindrical body 20 made of an elastic
material with one end opened and the other end closed. And airtightly fit the opening 21 on one
end side of the cylindrical body 20 on the sound collecting surface side having the acoustic
terminal 10a of the microphone unit 10, and airtight a predetermined volume in front of the
acoustic terminal 10a of the microphone unit 10 Air room AR is provided. [Selected figure]
Figure 2
Underwater microphone
[0001]
The present invention relates to an underwater microphone that picks up sound waves in water,
and more particularly to an underwater microphone that can perform realistic underwater sound
collection with low mechanical impedance.
[0002]
The submersible microphone is also called a hydromicrophone, and is designed to withstand the
water pressure because the water pressure increases with the depth in the water.
04-05-2019
1
As transducers, one with a strain gauge attached to the inside of an air bag (see Patent Document
1), one using a dynamic type unit (see Patent Document 2), and one using a piezoelectric unit
that is most frequently used (see Patent Document 3) and the like are known.
[0003]
Japanese Patent Publication No. 51-23905 Japanese Unexamined Patent Publication No. 9247797 Japanese Unexamined Patent Publication No. 2003-348695
[0004]
However, conventional underwater microphones have low sensitivity because they are designed
to be able to withstand mechanical pressure and withstand water pressure, regardless of the
transducer.
Therefore, even in the case where it is not necessary to immerse deeply in the water for sound
collection (for example, for sound collection such as swimming competition or underwater dance,
it may be installed at a depth of about several tens of cm in the water) I could not.
[0005]
Therefore, the problem to be solved by the present invention is an underwater microphone which
can perform sound collection with a sense of presence, which is suitable for sound collection
such as, for example, swimming competition and underwater dance, which does not need to be
particularly deeply sunk and collected in water. To provide.
[0006]
In order to solve the above-mentioned problems, the present invention relates to an underwater
microphone which picks up sound waves in water, a nondirectional microphone unit to which
waterproofing is applied, and an elastic member having one end opened and the other end
closed. And an opening at one end side of the cylindrical body is airtightly fitted on the sound
collecting surface side having the acoustic terminal of the microphone unit, and a predetermined
volume of the front side of the acoustic terminal of the microphone unit is It is characterized by
having an airtight air chamber.
04-05-2019
2
[0007]
In the present invention, the microphone unit may be a dynamic type provided with a voice coil
as long as it is nondirectional, but is preferably a capacitor type from the viewpoint of being
small and inexpensive.
[0008]
Also, the cylinder may be a metal as long as it can be deformed with respect to the pressure
change generated by the sound wave in the water, but it may be made of a thin synthetic resin in
terms of easiness of production and cost. preferable.
[0009]
According to the present invention, it is possible to perform realistic underwater sound collection
because the mechanical impedance is low.
In addition, since the microphone units are nondirectional, one unit can cover a wider range.
Furthermore, since the configuration is extremely simple, it can be manufactured inexpensively.
[0010]
Next, an embodiment of the present invention will be described with reference to FIGS. 1 and 2,
but the present invention is not limited thereto.
FIG. 1 is an exploded front view showing an underwater microphone according to the present
invention, and FIG. 2 is a front view showing a state of use in water.
[0011]
As shown in FIG. 1, this underwater microphone is composed of a microphone unit 10 and a
cylinder 20.
04-05-2019
3
The microphone unit 10 uses an omnidirectional type. Although a dynamic type (electrokinetic
type) may be used, a compact and inexpensive condenser microphone unit is preferable. In this
example, a non-directional electret condenser microphone unit having an outer diameter of 5 mm
used for a tie pin microphone or the like is employed.
[0012]
The microphone unit 10 is waterproofed since it is submerged in water. Although application of a
waterproofing agent (water repellent) is one effective method, a heat-shrinkable tube may be
covered to cause it to shrink and be rendered waterproof.
[0013]
As the cylinder 20, a tube having elasticity is used. A metal material may be used as long as it can
be deformed with respect to pressure changes generated by sound waves in water, but a thin
synthetic resin tube is preferable from the viewpoint of easiness of production and cost. In this
case, a vinyl chloride tube having a wall thickness of about 0.2 mm, an inner diameter of 5 mm
and an axial length of 120 mm is used.
[0014]
One end of the cylindrical body 20 is kept open and the other end is closed airtightly by fitting
the cap 21. The cap 21 may be made of metal since it is not necessary to have elasticity in
particular. In some cases, the other end side of the cylindrical body 20 may be closed by, for
example, heat sealing without using a cap.
[0015]
This underwater microphone is completed by airtightly fitting the opening 21 on one end side of
the cylindrical body 20 to the sound collecting surface side of the microphone unit 10 having the
acoustic terminal 10a through a suitable sealing material. A sealed air chamber AR of a
predetermined volume is provided in front of the acoustic terminal 10 a by 20.
04-05-2019
4
[0016]
FIG. 2 shows the underwater microphone installed in water.
This underwater microphone is suitable, for example, for sound collection such as swimming
competition and underwater dance, and as an example, the microphone unit 10 is installed and
used so as to be submerged at a depth of about several tens cm from the water surface.
[0017]
Assuming that the pressure in the water is P1 and the pressure in the air chamber AR is P2, the
pressure P2 in the air chamber AR changes with the pressure change of the water pressure P1
generated by the sound wave in the water, and the pressure in the air chamber AR The
microphone unit 10 converts the pressure change of P2 into an electrical signal.
[0018]
This underwater microphone has a sufficiently low mechanical impedance, so that it is possible
to have a realistic sound collection in the water.
Moreover, since the microphone unit 10 is nondirectional, it can pick up a wide range of
underwater sound.
[0019]
If the cylinder 20 is thin as described above, the cylinder 20 may be crushed by water pressure
and may not be able to be collected if it is sunk deep in the water, but in such a case, the
sensitivity is sacrificed. It can respond by using a highly elastic cylindrical body.
[0020]
The front view which decomposes | disassembles and shows the underwater microphone by this
invention.
04-05-2019
5
The front view which shows the use condition of the underwater microphone by this invention.
Explanation of sign
[0021]
Reference Signs List 10 microphone unit 10a acoustic terminal 20 cylinder 21 opening 22 cap
AR air chamber
04-05-2019
6
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