close

Вход

Забыли?

вход по аккаунту

?

DESCRIPTION JPH10336777

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 JPH10336777
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
microphone device used to convert sound into an electrical signal and output it to an audio
device such as a speaker device.
[0002]
2. Description of the Related Art So-called dynamic microphones have been known as
microphone devices. The dynamic microphone device 100 is provided with a microphone unit
101, as shown in an enlarged manner in FIG.
[0003]
The microphone unit 101 has a diaphragm 102 that vibrates upon receiving an acoustic, a voice
coil 103 coupled to the diaphragm 102, and a magnet 104 that forms a magnetic field.
[0004]
The dynamic microphone device 100 generates an electric current by moving the voice coil 103
in the magnetic field in accordance with the vibration of the diaphragm 102 to convert sound
into an electric signal.
17-04-2019
1
[0005]
In the dynamic microphone device 100, a microphone unit 101 provided with a member of a
vibration system such as a voice coil 103 is supported by a vibration isolation member 105 made
of rubber having elasticity, and is housed in a housing 106.
The dynamic microphone device 100 is configured to reduce noise due to external vibration such
as so-called touch noise by supporting the microphone unit 101 with the vibration isolation
member 105 in this manner.
[0006]
Further, in the dynamic microphone device 100, a lid 107 is provided on the rear surface side of
the vibration-proof member 105.
The bottom surface of the lid 107 is formed to be substantially parallel to the diaphragm 102. As
described above, the dynamic microphone device 100 has the lid 107 formed in a simple
cylindrical shape, similarly to the housing 106. Thus, the dynamic microphone device 100 can
further prevent the signal of the diaphragm 102 by providing the lid 107 on the rear surface side
of the vibration isolation cavity 105.
[0007]
As described above, in the dynamic microphone device 100, when the sound is converted into an
electric signal, the vibration of the diaphragm 102 is transmitted, and the vibration wave due to
the sound pressure is the vibration isolation member 105, The inside of the housing 106 or the
lid 107 is reached. As described above, in the dynamic microphone device 100, when converting
sound into an electrical signal, vibration waves due to sound pressure are generated inside the
vibration isolation member 105, the housing 106, or the lid 107.
[0008]
Further, in the above-described dynamic microphone device 100, when manufacturing the
housing 106 or the vibration isolation member 107, shaping processing or the like is applied to
17-04-2019
2
the inside to manufacture the microphone unit 101 and the like.
[0009]
However, in such a dynamic microphone device 100, since the casing 106 and the damping
member 107 are formed in a simple cylindrical shape, the reflection is performed inside the
damping member 105, the casing 106 and the damping member 107. The standing wave is
generated by the reflected wave.
As described above, in the microphone device 100, when a standing wave is generated inside the
housing 106 and the vibration isolation member 107, the standing wave and the sound wave
resonate to cause the diaphragm 102 to largely shake, which may cause noise. is there.
[0010]
Further, in the conventional dynamic microphone device 100, at present, no means for absorbing
standing waves generated in the vibration isolation member 105, the housing 106 and the
vibration isolation member 107 is provided.
[0011]
Therefore, the present invention has been proposed in view of the above-described actual
situation, and it is possible to suppress the generation of a standing wave in the inside of a
housing or a vibration suppression unit and convert sound into an electric signal. It is an object
of the present invention to provide a microphone device that can
[0012]
SUMMARY OF THE INVENTION The microphone device according to the present invention
solves the above-mentioned problems by gradually reducing the opening cross-sectional area in
the direction in which the vibration isolating member or the casing is separated from the
microphone unit.
[0013]
That is, in the microphone device according to the present invention, since the opening cross-
17-04-2019
3
sectional area is gradually reduced in the direction in which the vibration suppressing portion or
the housing is separated from the microphone unit, the microphone device according to the
present invention is reflected by the inner wall of the vibration suppressing portion or the
housing Can be dispersed.
Therefore, in the microphone device, the standing wave generated by combining the reflected
wave and the incident wave in the housing or the vibration suppression unit is suppressed.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION A microphone device according to the
present invention will be described below with reference to the drawings.
[0015]
In the following description, an example in which the present invention is applied to a so-called
dynamic microphone using an electromotive force generated when a conductor disposed in a
magnetic field moves will be described.
[0016]
In the microphone device 1, for example, as shown in FIG. 1, a microphone unit 10 is
accommodated in a housing 2 composed of a grip portion 3 and a cage portion 4.
[0017]
Then, in the microphone device 1, when a sound wave is incident through the cage portion 4, the
microphone unit 10 converts the sound wave into an electric signal and outputs the electric
signal to an external device.
[0018]
The grip portion 3 is connected to a cage portion 4 disposed on the front end side, and is formed
in a substantially cylindrical shape to accommodate the microphone unit 10.
The grip portion 3 is formed to have a smaller opening cross-sectional area toward the rear end
side.
17-04-2019
4
Therefore, this grip part 3 can prevent that a standing wave is generated inside by the sound
wave from cage part 4, for example.
That is, the grip portion 3 can scatter and reflect the sound wave from the cage portion 4 and
suppress generation of a standing wave by combining the sound wave incident on the inner wall
and the sound wave reflected by the inner wall can do.
[0019]
For example, as shown in FIG. 2, the microphone unit 10 includes a diaphragm 11 that vibrates
in response to an electric signal, a voice coil 12 that is connected to the diaphragm 11 and moves
up and down according to the vibration of the diaphragm 11. A magnet 13 disposed on the inner
circumferential side of the voice coil 12 for applying a magnetic field, and a frame yoke 14
disposed on the outer circumferential side of the magnet 13 and forming a magnetic path by the
magnetic field generated by the magnet 13 There is.
[0020]
The diaphragm 11 is formed of, for example, polyester or the like into a dome shape having a
diameter of about 20 mm, and a voice coil 12 wound in a cylindrical shape is attached to a
central region thereof.
The diaphragm 11 is attached to the frame yoke 14 by the diaphragm ring 15 so that the voice
coil 12 protrudes into the frame yoke 14.
[0021]
The frame yoke 14 forms a magnetic path by the magnetic field generated by the magnet 13, and
is formed in a substantially cylindrical shape with a bottom using, for example, iron as a material.
In the frame yoke 14, a magnet 13 for forming a magnetic field is mounted.
17-04-2019
5
The voice coil 12 is disposed to surround the magnet 13.
Further, between the inner wall of the frame yoke 14 and the outer wall of the magnet 13, a
stiffness ring 16 and a plate 17 are disposed. Further, a damper resistor 18 made of papyron
paper or the like is formed on the bottom of the frame yoke 14. And an electromagnetic
conversion circuit is formed of these each members.
[0022]
These electromagnetic conversion circuits are accommodated in the equalizer 19. The equalizer
19 is for compensating the amount of attenuation in a specific frequency band to make the
overall frequency characteristic flat. A terminal plate 20 is formed on the side wall portion of the
equalizer 19, and a lead wire (not shown) of the voice coil 12 is connected to the terminal plate
20.
[0023]
Further, a directional resistor 21 is disposed between the side wall portion of the equalizer 19
and the frame yoke 14. The directional resistance 21 determines directivity, and is formed of
compressed urethane or papyron paper.
[0024]
A unit screen 22 is adhered to the side opposite to the side where the electromagnetic
conversion circuit of the equalizer 19 is housed. The unit screen 22 protects the diaphragm 11
and protects the diaphragm 11 against wind, that is, blowing noise, and is formed of urethane
foam or the like.
[0025]
17-04-2019
6
Then, in the microphone device 1, the sound wave that has passed through the cage portion 4
from the upper surface of the unit screen 22 is incident. That is, the upper surface of the unit
screen 22 functions as the sound receiving surface 10 a of the microphone unit 10.
[0026]
The microphone device 1 including the microphone unit 10 configured as described above
includes a vibration suppression unit 5 that supports the microphone unit 10 on the rear surface
side of the microphone unit 10 and that suppresses vibration.
[0027]
The vibration suppression unit 5 supports the microphone unit 10 and suppresses the vibration
of the microphone unit 10.
As shown in FIG. 2, the vibration suppression unit 5 includes a vibration isolation member 6
disposed in a direction away from the microphone unit 10 and a lid 7 disposed on the rear
surface side of the vibration isolation member 6.
[0028]
For example, as shown in FIG. 2, the vibration isolation member 6 is formed in an outer shape
and substantially cylindrical shape. And the locking part 6a locked to the upper end of the grip
part 3 of the housing 2 is formed in the outer peripheral surface of the vibration-proof member
6. Further, a support portion 6 b for supporting the microphone unit 10 is formed on the
vibration isolation member 6 at one open end side. The other open end of the vibration isolation
member 6 is closed by the lid 7. Furthermore, a plurality of inner walls are concentrically formed
inside the vibration isolation member 6, and the plurality of inner walls form a cavity 6c to
enhance the vibration isolation effect. In addition, it is preferable that this vibration-proof
member 6 is a material with high efficiency in absorbing a vibration, for example, it is desirable
to be comprised from rubber etc.
[0029]
17-04-2019
7
As described above, the lid 7 is disposed on the open end side of the vibration-proof member 6 to
close the cavity 6c. Also in the inside of the lid 7, a cavity 7a is formed. Here, the bottom surface
7 b of the lid 7 is formed so as to be non-parallel to the diaphragm 11 so as to suppress the
generation of standing waves in the cavity 7 a of the lid 7. ing.
[0030]
Specifically, for example, the bottom surface 7b of the lid 7 is formed to have an inclination angle
θ of about 30 ° with respect to the sound receiving surface 10a. As described above, the
bottom surface 7b of the lid 7 is not parallel to the sound receiving surface 10a with an angle of
about 30 degrees with the sound receiving surface 10a, so that the bottom surface 7b is reflected
by the inner wall 7c of the cavity 7a formed by the lid 7 The waves can be made to scatter. That
is, the microphone device 1 can suppress the generation of the standing wave by combining the
sound wave incident on the inside of the cavity 7 a of the lid 7 and the reflected sound wave.
[0031]
The lid 7 may be made of synthetic resin, metal, wood or the like as a material. For example, the
length t1 on one side of the outer peripheral surface is about 11.7 mm, and the length t2 on the
other side is It is formed to be about 27.1 mm.
[0032]
The inner wall 7c of the lid 7 may have an uneven shape in order to scatter the reflected sound
wave even if the sound wave is incident, or it may be rough.
By making the inner wall 7c of the lid 7 rough as described above, it is possible to prevent the
reflected wave from being scattered and combining the incident wave and the reflected wave to
generate a standing wave.
[0033]
Further, as shown in FIG. 3, not only when the inside of the cavity 7a is hollow but also the
bottom surface 7b is not parallel to the diaphragm 11, as shown in FIG. At the same time, the
17-04-2019
8
sound absorbing material 8 may be filled inside the cavity 7a. Thus, the lid 7 can absorb the
reflection of the sound wave in the interior of the cavity 7a by filling the sound absorbing
material 8 in the cavity 7a, and can suppress the occurrence of the standing wave. . In addition,
as this sound absorbing material 8, urethane, micron glass, etc. can be used, for example.
[0034]
Furthermore, the sound absorbing material 8 filled in the cavity 7 a may be filled so that the
density gradually increases toward the tip 7 d of the lid 7. As described above, by increasing the
density toward the tip 7 d of the lid 7, the effect of the sound absorbing material 8 absorbing the
reflected wave can be further improved, and the generation of the standing wave is further
suppressed. be able to. That is, when the density of the sound absorbing material 8 on the
microphone unit 10 side is increased, incident waves are reflected to the microphone unit 10
side, and a standing wave can be generated inside the cavity 6 c configured by the vibration
isolation member 6 However, by increasing the density toward the direction away from the
microphone unit 10, the absorptivity of the sound wave can be gradually increased to absorb the
sound wave and prevent the generation of a reflected wave.
[0035]
In addition, as another shape of the lid 7, as shown in FIG. 4, it may be a conical shape so that the
tip portion 7a is pointed as it is separated from the microphone unit 10. Here, the tip 7 a of the
lid 7 does not have to coincide with the center line O of the microphone device 1, and the center
of the conical shape may be shifted. That is, the lid 7 is formed such that the opening crosssectional area decreases as it is separated from the microphone unit 10. Thus, the lid 7 has a
conical shape so that the sound waves generated inside the cavity 7a by the sound waves can be
scattered at the inner wall 7c. That is, in the inside of the cavity 7 a of the lid 7, the microphone
device 1 can suppress the generation of the standing wave by combining the incident wave and
the reflected wave by the sound wave.
[0036]
Even when the lid 7 has a conical shape, as in the case described with reference to FIG. 3, the
inner wall 7 c may have a concavo-convex shape in order to scatter the reflected wave, and
further, It may be rough.
17-04-2019
9
[0037]
Further, as shown in FIG. 5, the cavity 7c constituted by the lid 7 absorbs the reflected wave to
suppress the generation of the standing wave as in the case described with reference to FIG.
Alternatively, the inside of the cavity 7a may be filled with the sound absorbing material 8, and
the density of the sound absorbing material 8 may be increased toward the tip 7d of the lid 7.
[0038]
Further, as shown in FIG. 6, in the vibration suppression unit 5, the bottom surface 6f of the first
vibration isolation member 6d and the second vibration isolation member 6e in the direction
away from the microphone unit 10 is against the sound reception surface 10a. It may be formed
to be inclined so as to be non-parallel.
That is, as described above, the microphone device 1 shown in FIG. 6 includes the conical lid 7
and the bottom surfaces 6f of the first vibration isolation member 6d and the second vibration
isolation member 6e have the sound receiving surface 10a. It is formed to be inclined to.
[0039]
As described above, the first vibration isolation member 6d and the second vibration isolation
member 6e are formed such that the bottom surface 6f is inclined, whereby the sound wave from
the diaphragm 11 is a microphone unit when the sound is converted into an electric signal. Even
when light is incident from the side 10, the reflected waves are scattered on the wall surfaces of
the vibration-proof members 6d and 6e.
That is, the first vibration isolation member 6d and the second vibration isolation member 6e
suppress the generation of the standing wave generated by combining the incident wave and the
reflected wave in the cavity 6c. be able to.
[0040]
Further, since the microphone device 1 is formed so that the bottom surfaces 6f of the first
vibration isolation member 6d and the second vibration isolation member 6e are inclined, the
microphone device 1 includes the lid 7 as described above. Generation of standing waves in the
cavity 7a constituted by the body 7 is suppressed.
17-04-2019
10
[0041]
Therefore, in the microphone device 1, when the diaphragm 11 vibrates, a standing wave is
generated in the inside of the grip portion 3, in the cavity 6 c constituted by the vibration
isolation member 6 and in the cavity 7 a constituted by the lid 7. Can be suppressed, and the
resonance of the sound wave from the diaphragm 11 and the standing wave can be suppressed.
Therefore, the microphone device 1 can suppress the occurrence of the resonance phenomenon
inside, and can suppress the occurrence of the noise in the electric signal due to the vibration of
the diaphragm 11 largely. Therefore, the microphone device 1 can realize good sound quality
with little noise in the electric signal, high resolution, and good rising.
[0042]
In the microphone device 1, the case where the surface on which the sound wave of the grip
portion 3 and the vibration suppressing portion 5 is incident is formed to be inclined with
respect to the sound receiving surface 10a is described. Alternatively, the surface on which the
sound wave is incident may be inclined with respect to the sound receiving surface 10a.
[0043]
Next, the configuration of the microphone device will be described in detail by describing the
manufacturing process of the above-described microphone device 1.
[0044]
When manufacturing the microphone device 1, first, an adhesive is applied to the upper surface
side and the bottom of the inside of the frame yoke 14 in which the frame and the yoke are
integrated, and the stiffness ring 16 is inserted. And the magnet 13 is adhered and dried.
On the other hand, separately from this, the voice coil 12 is bonded to the diaphragm 11 with the
diaphragm ring 15 using an assembly jig or the like, and bonded and fixed to the diaphragm ring
15 with the lead wire of the voice coil 12 slightly loosened dry.
17-04-2019
11
[0045]
Next, the damper resistor 18 is bonded to the bottom of the frame yoke 12 to which the magnet
13 is bonded and fixed.
Then, an adhesive is applied to the inner periphery of the equalizer 19 and the diaphragm 11
with the voice coil 12 is inserted, and immediately thereafter, the frame yoke 12 is inserted, and
the film is adhered and dried and fixed.
[0046]
Next, when assembling the vibration isolation member 6, for example, a resistor is adhered to the
upper surface and the lower surface of the vibration isolation rubber, and the lid 7 is adhered
and fixed to the bottom surface. Then, after drying the bonding portion, the microphone unit 10
having the equalizer 19 and the magnetic circuit is bonded and fixed to the upper surface of the
vibration proof rubber, and after drying the adhesive, the equalizer 19 is magnetized in a
predetermined direction. The microphone unit 10 is completed.
[0047]
Next, attach the on / off switch and the connection terminal to the grip portion 3 and fix the
microphone unit on the top surface of the housing 2 with a screw or the like so as to be held by a
part with a windshield. .
[0048]
As described above in detail, in the microphone device according to the present invention, the
opening cross-sectional area is gradually reduced in the direction in which the vibration
suppressing portion or the housing moves away from the microphone unit. The sound wave
incident by the vibration suppression unit or the inner wall of the housing can be dispersed and
reflected.
Therefore, this microphone device can suppress the standing wave generated by combining the
17-04-2019
12
reflected wave and the incident wave inside the housing or the vibration suppression unit.
Therefore, in this microphone device, the standing wave generated inside the housing or the
vibration suppression unit and the sound wave generated from the diaphragm side do not
resonate to cause the diaphragm to vibrate largely. Therefore, according to this microphone
device, since the noise generated in the electric signal detected from the diaphragm is reduced,
good sound quality can be realized.
[0049]
Brief description of the drawings
[0050]
1 is a partial sectional view showing a partially cut away microphone device to which the present
invention is applied.
[0051]
2 is a partial sectional view showing a partially cut away example of the microphone unit and the
vibration suppression unit.
[0052]
3 is a partial cross-sectional view showing a partially cut away another example of the
microphone unit and the vibration suppression unit.
[0053]
4 is a partial cross-sectional view showing a partially cut away another example of the
microphone unit and the vibration suppressing portion.
[0054]
5 is a partial cross-sectional view showing a partially cut away another example of the
microphone unit and the vibration suppression unit.
[0055]
6 is a partial cross-sectional view showing a partially cut away another example of the
microphone unit and the vibration suppression unit.
17-04-2019
13
[0056]
7 is a partial cross-sectional view showing a part of the conventional microphone unit and the
vibration suppressing portion cut away.
[0057]
Explanation of sign
[0058]
DESCRIPTION OF SYMBOLS 1 Microphone apparatus, 2 housing | casings, 5 vibration
suppression part, 6 anti-vibration members, 7 lids, 10 microphone units
17-04-2019
14
Документ
Категория
Без категории
Просмотров
0
Размер файла
23 Кб
Теги
description, jph10336777
1/--страниц
Пожаловаться на содержимое документа