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DESCRIPTION JP2011015006

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DESCRIPTION JP2011015006
The present invention provides a highly reliable microphone device that reliably shuts off sound
leakage without requiring a high degree of dimensional accuracy. The microphone device
includes a housing (1), an upright portion (2) formed so as to surround a sound hole (H) of the
housing (1), and a sound collecting portion opposed to the sound hole. A microphone unit 4
including an acoustic transducer, a main body 3 a which covers the side circumference of the
microphone unit 4 and is elastically mounted between the standing portion 2, and the
microphone unit from the end face of the standing portion 2 The elastic holder 3 has a flange
portion 3 b covering the peripheral portion so as to extend to the end face of the elastic member
4, and the rising portion 2 is characterized by being higher than the height of the microphone
unit 4. [Selected figure] Figure 1
Microphone device and method of manufacturing the same
[0001]
The present invention relates to a microphone device and a method of manufacturing the same,
and more particularly to a mounting structure of a microphone to a housing such as a portable
terminal.
[0002]
Condenser microphones play a role as microphones for portable terminals and the like, and in
recent years, with the advancement of functions and miniaturization of portable terminals, in
particular, demands for higher functions and miniaturization have been increasing in recent
years.
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[0003]
The electret condenser microphone (ECM) includes a microphone unit, a holder for housing the
microphone unit, and a pair of springs functioning as external connection terminals of the
microphone unit.
The microphone unit comprises an acoustic transducer, for example, having a short cylindrical
shape, on the bottom or top of which an electrode pattern for external connection is formed.
Further, one end of each of the pair of springs abuts on each of the pair of electrode patterns of
the microphone unit, and the other end is electrically connected to an analog front end for voice
processing such as a portable telephone.
[0004]
The microphone unit has a so-called electro-acoustic conversion function of converting a change
in capacitance of a capacitor, which changes in accordance with an acoustic signal, into an
electrical signal and outputting it.
[0005]
Conventionally, as a microphone device of this type, a structure in which a microphone unit is
held by a rubber holder is employed.
This microphone device has a structure in which a microphone unit is inserted after inserting a
coil spring into a usual rubber holder made of an elastic material, and the microphone unit is
fixed so as to be enclosed by the rubber holder.
[0006]
That is, the holder for accommodating the microphone unit is required to have the contradictory
properties of flexibility for facilitating the accommodation of the microphone unit and rigidity
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capable of firmly holding a spring functioning as an external connection terminal. Ru. Then, the
present applicant has a first holder formed so as to be able to hold the microphone unit and the
spring in a state where one end of a spring functioning as an external connection terminal is in
contact, and the first holder and the microphone Patent Document 1 proposes a structure having
a second holder made of a softer material than the first holder, which holds the unit in a
wrapping manner (Patent Document 1).
[0007]
JP, 2006-166065, A
[0008]
Conventionally, various microphone devices have been proposed, but as the sensitivity of the
microphones increases, the problem of sound leakage becomes serious.
As shown schematically in FIG. 5, the rising portion 2 is formed in the housing 1, and the
condenser microphone (microphone unit) 4 is attached to the rising portion 2 via the elastic
holder 3, and the printed wiring board 5 is pressed. Also in the mounting structure, the sound
emitted from the sound source wraps around the back side of the housing 1 as shown in the path
B as well as the path A reaching the microphone via the sound hole, and reaches the microphone
from the back side of the microphone There is a case. In this case, there is a problem that sound
can not be collected with high quality because of interference of sound and generation of echo
due to phase difference.
[0009]
Therefore, as shown in FIG. 6, a method has been proposed in which the elastic holder 3 is
pressed by the printed wiring board 5 and sealing is performed in the region Rf between the
elastic holder 3 and the front case 1. There is a problem that load is applied to the unit 4 to cause
destruction of the microphone unit 4 and characteristic change. In order to seal between the side
peripheral surface of the elastic holder 3 and the cylindrical upright portion 2 formed in the
housing 1 (region Rs), it is necessary to strengthen the fit between the elastic holder and the
upright portion. In addition to requiring a high degree of dimensional accuracy, there is also a
problem that the elastic holder 3 comes off at the time of incorporation.
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[0010]
The present invention has been made in view of the above situation, and has an object to provide
a highly reliable microphone device that has a simple configuration, reliably shuts off sound
leakage without requiring high dimensional accuracy. Do.
[0011]
A microphone device according to the present invention includes a case, an upright portion
formed so as to surround a sound hole of the case, an acoustic transducer disposed such that a
sound collecting portion faces the sound hole, and A body covering the side circumference of the
acoustic transducer and elastically mounted between the rising portion, and a ridge covering the
peripheral portion so as to extend from the end face of the rising portion to the end face of the
acoustic transducer And an elastic holder, wherein the rising portion is higher than the height of
the acoustic transducer.
According to this configuration, the printed wiring board mounted on the back side of the
acoustic transducer (including the microphone unit) via the elastic holder is mounted by pressing
the rear end face of the rising portion via the elastic holder. At this time, since sound sealing
(sealing) can be performed between the rear end surface of the rising portion and the ridge
portion of the elastic holder, it is only necessary that the rising portion is in close contact with
the ridge portion. As described above, the height of the acoustic transducer is lower than that of
the rising portion by forming the height of the rising portion from the surface of the casing to be
higher than the height of the acoustic transducer. Since no load is applied and sealing in the
region Rs between the side circumferential surface of the elastic holder and the rising portion is
not required, it is not necessary to strengthen the engagement between the elastic holder and the
rising portion, so There is no risk of the elastic holder falling off.
[0012]
Further, according to the present invention, in the microphone device, the elastic holder is raised
from a donut-shaped disc portion and an intermediate portion of the disc portion to cover a
peripheral edge portion including the side surface of the acoustic transducer in a U-shape in
cross section. Including those having a U-shaped tubular portion. According to this configuration,
since the U-shaped tubular portion covering the side surface of the acoustic transducer in a Ushaped cross section is provided, the acoustic transducer can be reliably held elastically.
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[0013]
In the microphone device according to the present invention, the acoustic transducer is a
condenser microphone device.
[0014]
The present invention also includes the microphone device, wherein the condenser microphone
device is a MEMS microphone.
According to this configuration, it is possible to reduce the size and thickness.
[0015]
The method for manufacturing a microphone device according to the present invention further
comprises the steps of: providing an upright portion covering a peripheral edge of an acoustic
transducer to be mounted on a housing and having a height higher than a height of the acoustic
transducer; An elastic holder comprising a body covering the side circumference of the body and
a ridge covering the peripheral edge so as to extend from the end face of the rising portion of the
acoustic transducer to the end face of the acoustic transducer; And pressing the back surface
with the wiring substrate to fix the case. According to this configuration, the rear end surface of
the rising portion and the elastic holder are pressed by pressing the rear end surface of the rising
portion through the elastic holder by the printed wiring board mounted on the back side of the
acoustic transducer through the elastic holder. Sound sealing can be performed between the
buttocks. Also, since the acoustic transducer is lower in height than the rising portion, no load is
placed on the acoustic transducer, and sealing in the region Rs between the side surface of the
elastic holder and the rising portion is not required. There is no need to strengthen the fit
between the elastic holder and the rising portion, and therefore there is no risk of the elastic
holder falling off.
[0016]
As described above, according to the present invention, sound sealing (sealing) can be performed
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between the rear end surface of the rising portion and the ridge portion of the elastic holder, and
the rising portion is in close contact with the ridge portion All you have to do is do. Therefore,
the dimensional accuracy can be formed without much concern, and since the acoustic
transducer is lower than the upright portion, no load is placed on the acoustic transducer, and
the side circumferential surface of the elastic holder Since the sealing in the region Rs between
the and the rising portion is not required, it is not necessary to make the fitting between the
elastic holder and the rising portion strong, so that there is no risk of the elastic holder falling off.
[0017]
Cross-sectional view of the microphone device according to the first embodiment of the present
invention A perspective view of the microphone device according to the first embodiment of the
present invention A perspective view of an elastic holder of the microphone device according to
the first embodiment of the present invention in the second embodiment Cross section of
microphone device Cross section of conventional condenser microphone Cross section of
conventional condenser microphone
[0018]
Hereinafter, embodiments of the present invention will be described with reference to the
drawings.
(First Embodiment) FIG. 1 is a schematic cross-sectional view of a condenser microphone
according to a first embodiment of the present invention, FIG. 2 is a perspective view (only a part
of the case 1 is shown), and FIG. 3 is a perspective view of an elastic holder. is there. The
condenser microphone according to the first embodiment of the present invention includes a
housing 1, a cylindrical standing portion 2 formed so as to surround a sound hole H provided in
a predetermined area of the housing 1, and the sound hole H: a main unit elastically mounted
between the rising portion 2 while covering the side circumference of the microphone unit 4 and
the microphone unit 4 including an acoustic transducer disposed so that the sound collecting
unit faces the H 3a and an elastic holder 3 having a flange portion 3b covering the peripheral
portion of the microphone unit 4 so as to extend from the end surface of the rising portion 2 to
the end surface of the microphone unit 4, and this rising portion 2 is the microphone It is
characterized by being higher than the height of the unit 4. As shown in FIG. 3, the elastic holder
3 is erected from a donut-shaped disk portion 3 b and an intermediate portion of the flange
portion 3 b, and the peripheral portion including the side surface of the microphone unit 4 has a
U-shaped cross section. And a main body portion 3a consisting of a U-shaped cylindrical portion
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covering the same. The main body 3a is bent inward at its end and includes the front face 3f that
abuts the surface of the housing 1, so that the microphone unit can be held more reliably. Then,
the printed wiring board 5 is pressed from the back surface of the elastic holder 3 and fixed.
[0019]
At the time of mounting, the housing 1 is provided with an upright portion 2 covering the
periphery of the microphone unit to be mounted and higher than the height of the microphone
unit 4, and the microphone unit 4 is engaged with the upright portion 2. The elastic holder 3 is
inserted, and the flange 3b of the elastic holder covers the peripheral portion so as to extend
from the end face of the rising portion to the end face of the microphone unit, and uses the
printed wiring board 5 to Press and fix on the case. Here, the printed wiring board 5 is
electrically connected by leads (not shown) and fixed using screws (not shown). The microphone
unit 4 itself is not described in detail here because it uses a conventional one, but a microphone
unit using a conventional acoustic transducer may be used, or a MEMS element may be used.
[0020]
According to the above configuration, since the sound sealing (sealing) can be performed
between the rear end surface of the rising portion and the ridge portion of the elastic holder, that
is, in the region indicated by Ra in FIG. It is possible to realize reliable sealing only by adhering to
the Further, by mounting the printed wiring board 5 on the back side of the microphone unit 4
via the elastic holder 3, the rear end surface of the rising portion 2 can be mounted by pressing
via the elastic holder 3. Since the height from the housing surface of the microphone unit is
lower than the height of the rising portion, it is the rising portion 2 that is pressed, and no load is
applied to the microphone unit 4. In addition, since sealing in the region Rs between the side
peripheral surface of the elastic holder 3 and the rising portion 2 is not required, it is not
necessary to strengthen the engagement between the elastic holder and the rising portion, and
therefore the elastic holder falls off There is no risk of
[0021]
Second Embodiment FIG. 2 is a schematic cross-sectional view of a condenser microphone
according to a second embodiment of the present invention. In the first embodiment, the main
body portion 3a of the elastic holder 3 is formed of a U-shaped tubular portion provided with a
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front surface portion 3f which is bent inward at an end portion and abuts on the surface of the
housing 1; The peripheral portion including the side surface of the microphone unit 4 is covered
in a U-shape in cross section, but the front surface portion 3 f is not necessarily essential, and
may be omitted. In the present embodiment, a structure in which the front surface 3f is omitted
will be described.
[0022]
In this elastic holder, the main body portion 3a is constituted by a cylindrical body, and is
constituted by the collar portion 3b so that the end face abuts on the surface of the housing 1,
and the peripheral portion including the side surface of the microphone unit 4 and the end
surface In a T-shaped cross section.
[0023]
Also according to this configuration, sound sealing (sealing) can be performed between the rear
end surface of the rising portion and the ridge portion of the elastic holder, that is, in the region
indicated by Ra in FIG. Only by close contact, reliable sealing can be realized.
Further, by mounting the printed wiring board 5 on the back side of the microphone unit 4 via
the elastic holder 3, the rear end surface of the rising portion 2 can be mounted by pressing via
the elastic holder 3. Since the height of the microphone unit is lower than that of the rising
portion, it is the rising portion 2 that is pressed, and no load is applied to the microphone unit 4.
Also, the microphone unit can be held more reliably without the risk of the elastic holder falling
off.
[0024]
Although in the first and second embodiments, an acoustic transducer formed by machining is
used, both the acoustic transducer and the impedance conversion element may be formed by a
semiconductor process, and are formed on the same wafer. You may At this time, by forming a
wiring pattern such as Al wiring on the wafer, it is possible to achieve electrical connection
between the acoustic transducer and the impedance conversion element, and to miniaturize the
condenser microphone. Further, this eliminates the process of electrically connecting the acoustic
transducer and the impedance conversion element, such as wire bonding, and the number of
steps can be reduced, so that the microphone can be produced inexpensively. Further, the
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mounting terminal and the case mounting terminal are not limited to metal pieces and may be
conductive materials.
[0025]
Further, the rising portion may be integrally formed with the housing or may be separately
formed. The material may also be a resin material or metal. In addition, it is desirable to use a
cylindrical body that covers the entire side circumference of the microphone unit, but pressing a
printed wiring board, such as a mesh body or a structure in which a plurality of pins are
arranged in a cylindrical shape around the microphone unit It is sufficient that the structure has
a rigidity enough to withstand the force.
[0026]
INDUSTRIAL APPLICABILITY The present invention can be applied to a portable terminal such as
a mobile phone because it can be provided with a highly reliable microphone that is easy to
install, has less sound leakage, and is reliable.
[0027]
Reference Signs List 1 case 2 upstanding portion 3 elastic holder 4 microphone unit 5 printed
wiring board H sound hole
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