close

Вход

Забыли?

вход по аккаунту

?

DESCRIPTION JP2011009807

код для вставкиСкачать
Patent Translate
Powered by EPO and Google
Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
financial decisions, should not be based on machine-translation output.
DESCRIPTION JP2011009807
An object of the present invention is to provide a uni-directional cylindrical condenser
microphone unit capable of preventing cavity resonance by using a filling member functioning as
an acoustic resistance. SOLUTION: A cylindrical body 52 having a built-in electronic circuit
member held by a holding member 64 at a rear position of a rear acoustic terminal 54 provided
at a front end portion 53, and a front acoustic terminal 58 at a front end surface 57a. And the
condenser microphone unit 57 detachably attached to the front end side of the cylinder 52, and
the holding member 64 is provided in the cavity 55 secured in the front end 53 of the cylinder
52 via the holding member 64. In the unidirectional cylindrical condenser microphone unit 11
provided with the supported filling member 12, the filling member 12 is formed of a plastic
sintered porous body 13 having a large number of continuous pores, and the continuous pores
are made of sound waves. It functions as an acoustic resistance hole that allows transmission to
prevent the occurrence of cavity resonance. [Selected figure] Figure 1
Unidirectional cylindrical condenser microphone
[0001]
The present invention is a technique relating to a unidirectional cylindrical condenser
microphone provided with a structure capable of preventing occurrence of cavity resonance.
[0002]
In general, as also shown in Patent Document 1 below, the condenser microphone unit has an
open end which is closed by having a front acoustic terminal as a sound introduction hole and
which partitions the other open side, as also shown in the following Patent Document 1 A unit
case formed by cutting a female screw on the inner peripheral surface of the part, a diaphragm
18-04-2019
1
ring having a diaphragm, a spacer ring, in order from the side of the front acoustic terminal in
the unit case to the open end; The fixed pole to the diaphragm and the insulating seat are
accommodated, and the lock pole is engaged with the diaphragm ring through the insulating seat
by a lock ring screwed to the back of the insulating seat via an external screw screwed to the
female screw. It is formed in such a way that it can be pressed and fixed with a predetermined
pressure.
[0003]
JP 2004-343368 A
[0004]
FIG. 2 shows a general example of a uni-directional cylindrical condenser microphone formed by
housing a conventional condenser microphone unit including the condenser microphone unit
disclosed in Patent Document 1 in a cylinder. It is a figure, (a) of them shows a right side view,
and (b) shows a front view, respectively.
[0005]
According to this figure, the unidirectional cylindrical condenser microphone 51 has a cylindrical
body 52 having a rear acoustic terminal 54 on the circumferential surface 52a of its front end
53, and a front acoustic terminal 58 on its distal end surface 57a. A condenser microphone unit
57 screwed to the tip end side of the cylindrical body 52 is configured.
[0006]
Further, as is apparent from FIGS. 3 and 4, in the cylindrical body 52, the circuit board 63
electrically connected to the output connector portion 62 housed and disposed in the rear end
portion 56 is provided. The distal end side is disposed under the state of being held by the
holding member 64.
[0007]
That is, as a result of requiring a space for housing and arranging the electronic circuit members
including the circuit board 63 in the cylindrical body 52, the space where the rear acoustic
terminals 54 are located after arranging these at predetermined positions is A cavity 55
communicating with the outside air through the rear acoustic terminal 54 is left.
[0008]
18-04-2019
2
Then, since the cavity 55 has an acoustic mass at the rear acoustic terminal 54 while operating
as an acoustic capacitance, there is a problem that resonance occurs to deteriorate the directional
frequency response.
[0009]
For this reason, by arranging the filling member 72 supported by the holding member 64 in the
hollow 55 of the cylindrical body 52, it is possible to raise the resonance frequency to a high
frequency by reducing the volume thereof. It is done.
[0010]
Moreover, in the cavity 55, when flat surfaces face each other, a reflected wave is generated, and
the directional frequency response is also degraded by the reflected wave, so that the filling
member 72 faces the rear end side of the condenser microphone unit 107. The surface is formed
into a hemispherical shape as shown in FIG. 5 (b) or a frusto-conical shape as shown in FIG. 5 (c)
without making the flat surface 73 as shown in FIG. 5 (a) After being made into the protruding
surface 78, it is accommodated and disposed in the cavity 55.
[0011]
By the way, it is necessary to arrange in the filling member 72 an interposed conductor portion
75 for electrically connecting the lead-out electrode rod 59 of the condenser microphone unit 57
and the circuit board 63 side.
[0012]
For this reason, since it is necessary to electrically insulate filling member 72 itself from
intervening conductor part 75, it was formed using synthetic resin, such as polycarbonate with
high insulation.
[0013]
However, the filling member 72 satisfies the conditions such as that the sound wave entering
from the rear acoustic terminal 54 can be guided to the condenser microphone unit 57 side, the
volume of the cavity 55 can be reduced, and reflection of the sound wave does not occur. Since it
is required, there is a complication that the filling member 72 has to be designed while repeating
trial and error in order to satisfy such conditions.
[0014]
18-04-2019
3
In view of the above problem of the prior art being derived from a filling member that does not
transmit sound waves, the present invention can easily satisfy the above conditions by using a
filling member that can function as an acoustic resistance. It is an object of the present invention
to provide a single directional condenser microphone unit.
[0015]
The present invention has been made to achieve the above object, and is a cylindrical body
incorporating the electronic circuit member side held by the holding member at the rear position
of the rear acoustic terminal provided on the circumferential surface of the front end. And a
condenser microphone unit having a front acoustic terminal on the front end surface and
detachably mounted on the front end side of the cylinder, and a cavity secured in the front end of
the cylinder via the holding member is In the unidirectional cylindrical condenser microphone
unit in which the internal volume is reduced by a filling member disposed supported by the
holding member, the filling member is a plastic sintered porous body having a large number of
continuous pores. The most important feature is that the continuous pores function as acoustic
resistance holes that allow transmission of sound waves.
[0016]
In this case, it is preferable that the filling member form a surface facing the condenser
microphone unit as a projecting surface.
[0017]
According to the invention of claim 1, since the plastic sintered porous body having a large
number of continuous pores is used as the filling member, the continuous pores are made to
operate as the acoustic resistance pores, and the acoustic capacity of the cavity and the rear
acoustic terminal The occurrence of cavity resonance can be effectively prevented by making it
equivalent to the fact that the acoustic resistance is connected in parallel with the acoustic
capacitance of the resonant circuit by the acoustic mass.
[0018]
According to the second aspect of the present invention, since the surface of the filler member
facing the condenser microphone unit is formed as a curved surface, generation of a reflected
wave can be suppressed and deterioration of the directional frequency response can be
prevented. .
[0019]
18-04-2019
4
It is an enlarged end elevation showing the principal part structure in the longitudinal section
direction of the present invention, and (a) of them shows a first example, and (b) shows a second
example.
BRIEF DESCRIPTION OF THE DRAWINGS It is explanatory drawing which shows the general
example of the unidirectional cylinder type | mold capacitor | condenser microphone containing
this invention, (a) of those shows a right side view, (b) shows a front view, respectively.
FIG. 3 is an end view showing an example of a longitudinal sectional structure of the
unidirectional cylindrical condenser microphone shown in FIG. 2;
FIG. 4 is an end view showing the uni-directional cylindrical condenser microphone shown in FIG.
3 in a state in which a cylinder and a condenser microphone unit are separated.
It is an enlarged end view showing the principal part structure in the longitudinal section
direction of a single directional cylindrical condenser microphone which is conventionally, (a) of
which is a first prior art example and (b) is a second prior art example. (C) shows the 3rd prior
art example, respectively.
[0020]
The uni-directional cylindrical condenser microphone according to the present invention is
formed to have substantially the same structure as that of the example shown in FIG. 2, so the
same parts will be described with the same reference numerals.
[0021]
That is, as shown in FIG. 2, the unidirectional cylindrical condenser microphone 11 has a
cylindrical body 52 having a rear acoustic terminal 54 on the circumferential surface 52a of its
front end 53, and a front acoustic wave on the distal end surface 57a. A condenser microphone
unit 57 having a terminal 58 and detachably screwed to the tip end of the cylindrical body 52 is
configured.
[0022]
18-04-2019
5
Further, as is apparent from FIGS. 3 and 4, in the cylindrical body 52, the circuit board 63
electrically connected to the output connector portion 62 housed and disposed in the rear end
portion 56 has a tip thereof The part side is disposed under the state of being held by the holding
member 64.
[0023]
Therefore, the space for housing and arranging the circuit board 63 and the like in the cylindrical
body 52 is a portion on the rear end portion 56 side where the electronic circuit member such as
the circuit board 63 is housed and arranged via the holding member 64 and the capacitor It is
divided into the microphone unit 57 and the portion on the front end 53 side facing the
microphone unit 57.
[0024]
As a result, in the portion of the cylindrical body 52 where the rear acoustic terminal 54 is
located, a cavity 55 communicating with the outside air via the rear acoustic terminal 54 is left,
and the cavity 55 operates as an acoustic capacitance. .
[0025]
Further, in the cavity 52 secured in the front end portion 53 of the cylindrical body 52, the filling
member 12 supported by the holding member 64 is disposed so that the resonance frequency
can be raised to a high frequency, and the filling The presence of member 12 reduces the volume
of cavity 52.
[0026]
In this case, the filling member 12 has an outer diameter smaller than the outer diameter of the
circular collar portion 14 and the circular collar portion 14 as in the illustrated example, for
example, and protrudes toward the front end portion 53 of the cylinder 52 A cylindrical portion
which can be fitted with the main body portion 15 and the step portion 65 concentric with the
main body portion 15 and having a smaller diameter and projecting in the back direction of the
circular collar portion 14 and the holding member 64 is provided on the inner diameter side And
16 are formed.
[0027]
Further, the filling member 12 is formed with a through hole 17 having a diameter smaller than
the inner diameter of the cylindrical portion 16 in the axial center extending direction, and the
intervening conductor portion 18 is inserted through the through hole 17. By using the
18-04-2019
6
interposed conductor portion 18 as a relay material, the lead-out electrode rod 59 provided in
the capacitor microphone unit 57 and the circuit board 63 side as shown in FIG. 3 are electrically
connected to each other.
[0028]
Moreover, since the filling member 12 is formed by using the plastic sintered porous body 13
having a large number of continuous pores (not shown), the acoustic capacity of the cavity 55 is
operated by operating the continuous pores as acoustic resistance pores. And the acoustic mass
of the rear acoustic terminal 54 can be equivalent to the acoustic capacitance connected in
parallel with the acoustic capacitance of the resonant circuit.
[0029]
In addition, the filling member 12 has a surface facing the rear end side of the condenser
microphone unit 57 in the main body portion 15 in a hemispherical shape shown in FIG. 1A or a
frusto-conical shape shown in FIG. After being made into the projecting surface 15a formed in
this way, it is accommodated and arranged in the cavity 55.
[0030]
Next, to explain the operation and effects of the present invention having the above
configuration, it is housed and disposed in the rear end portion 56 in the cylindrical body 52 as
apparent from FIGS. 3 and 4. The circuit board 63 electrically connected to the output connector
portion 62 can be disposed in a state where the tip end side thereof is held by the holding
member 64.
[0031]
Further, the portion where the rear acoustic terminal 54 is located in the cylindrical body 52
after housing and arranging the electronic circuit member including the circuit board 63 is
partitioned by the holding member 64 and communicates with the outside air through the rear
acoustic terminal 54 The cavity 55 will be left behind.
[0032]
Moreover, since the filling member 12 supported by the holding member 64 is accommodated
and arranged in the cavity 55 to reduce its volume, the resonance frequency can be raised to a
high frequency, and the cavity 55 operates as an acoustic capacity. Among them, even if there is
an acoustic mass in the rear acoustic terminal 54, excellent directional frequency response can
be exhibited without generating resonance.
18-04-2019
7
[0033]
Further, since the filling member 12 itself is formed of the plastic sintered porous body 13
having a large number of continuous pores, the above-mentioned continuous pores are operated
as the acoustic resistance holes to obtain the acoustic capacity of the cavity 55 and the rear
acoustic terminals 54. By making the acoustic resistance equivalent in parallel to the acoustic
capacitance of the resonant circuit due to the acoustic mass, it is possible to effectively prevent
the occurrence of the cavity resonance.
[0034]
Furthermore, in the case where the surface facing the condenser microphone unit 57 in the main
body portion 15 of the filling member 12 is formed as the projecting surface 15a, the generation
of the reflected wave is suppressed to prevent the directional frequency response from being
deteriorated. Can.
[0035]
The above has described the present invention based on the illustrated examples, and the specific
configuration thereof is not limited to this.
For example, the filling member 12 may be a concave surface or a flat surface as shown in FIG.
5A, if desired, without using the surface facing the condenser microphone unit 57 as the
protruding surface 15a.
Further, the projecting surface 15a of the filling member 12 can be formed by giving an
appropriate projecting shape other than the illustrated example.
[0036]
11 Unidirectional cylindrical condenser microphone unit 12 Filling member 13 Plastic sintered
porous body 14 Circular ridge 15 Main body 15a Projection surface 16 Cylindrical portion 17
Through hole 18 Interposed conductor 52 Tubular body 52a Peripheral surface 53 Front end 54
Rear acoustic terminal 55 hollow 56 rear end 57 condenser microphone unit 57a front end
surface 58 front acoustic terminal 59 lead electrode rod 62 output connector portion 63 circuit
board 64 holding member 65 stepped portion
18-04-2019
8
18-04-2019
9
Документ
Категория
Без категории
Просмотров
0
Размер файла
18 Кб
Теги
jp2011009807, description
1/--страниц
Пожаловаться на содержимое документа