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JP2007101305

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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 JP2007101305
An object of the present invention is to provide a vibration detection device with high
productivity and sensitivity. A microphone device 1 is formed of a resin-molded cylindrical case 2
and an inner cylindrical portion at one axial end side of the cylindrical case 2 and a first
accommodating portion 26 having an opening at the one end side. A second accommodating
portion 23 communicating with the first accommodating portion 26 and formed in an inner
cylindrical portion on the other axial end side of the cylindrical case 2, and a vibration fitted and
fixed to the second accommodating portion 23 A detection element 3; and a vibration
transmission medium 4 accommodated in the first accommodation portion 26 and physically
contacting the vibrating membrane of the vibration detection element via a communicating
portion with the second accommodation portion 26; There is. [Selected figure] Figure 2
Vibration detection device
[0001]
The present invention relates to a vibration detection apparatus that detects an individual
vibration transmitted through soft tissue of a human body.
[0002]
2. Description of the Related Art Conventionally, transmission of sound through bone of human
body as a medium, a speaker using so-called bone conduction, and the like have been developed.
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To this bone conduction, in recent years, a transmission mechanism called meat conduction, in
which the sound medium is soft tissue such as human muscle, fat, and skin, has attracted
attention, and a microphone device etc. utilizing this meat conduction has been developed (See,
for example, Non-Patent Document 1). Meat conduction is a transmission mechanism of vibration
that conducts mainly the soft tissue of the human body after unvoiced breathing sound
generated by turbulent flow noise in the airway is modulated by acoustic filter characteristic
change due to movement of the speech organ. According to the meat conduction, since the
airway sound transmitted through the soft tissue is directly sampled, it is possible to detect with
high sensitivity even a much smaller volume than a normal voicing volume such as a whisper.
[0003]
Products using meat conduction are under development, and various studies are being promoted
for practical use. For example, a vibration detection apparatus such as the above-mentioned
microphone device is still manufactured manually, and for mass production, it is not practical in
terms of the resistance and productivity of the product itself.
[0004]
The configuration of a conventional microphone device using meat conduction is shown in FIG.
This microphone device M is formed in a cylindrical shape, and the microphone element m5 is
placed in a case m1 having an opening at the top and the periphery thereof is filled with hard
silicone m7, and the space released by the remaining openings is filled with soft silicone m8. It is
Also, an O-ring m9 is provided at the outer peripheral end of the case m1.
[0005]
In use, the exposed soft silicone m8 surface is in contact with the soft tissue of the human body,
usually the skin, and the sound vibration from this skin is conducted to the microphone element
m5 through the soft silicone m8 layer.
[0006]
A method of manufacturing the microphone device M of FIG. 7 will be described with reference
to FIG.
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First, as shown to Fig.8 (a), the cylindrical case m1 by which the soundproof sheet was processed
and the upper part was opened is created. Next, a rubber member m3 for sound absorption is
laid on the bottom portion in the cylinder, and the top is covered with a soundproof sheet to
produce a substrate. When the base is completed, the base m4 made of hard silicone is placed in
the center of the base, and the microphone element m5 is placed on the base m4. In the
microphone element m5, a cable m6 for electrically connecting to the outside is disposed
through the side surface of the case m1.
[0007]
Next, the microphone element m5 is placed on the pedestal m4, and as shown in FIG. 8B, the
hard silicone m7 is filled around the microphone element m5. The hard silicone resin m7 is
shaped so that its inner diameter decreases from the opening of the case m1 toward the
microphone element m7 in order to act as a reflection plate for sound and vibration. In addition,
in order to arrange the O-ring m9 at the opening end, the opening end portion is formed into a
flat surface having a width.
[0008]
Next, as shown in FIG. 8C, an O-ring m9 is placed on the open end portion of the upper part of
the case m1, and fixed by an adhesive. O-ring m9 is used as a filling frame of soft silicone to be
filled later. When the position of the O-ring m9 is fixed, the outer surface of the case m1 is
coated with the polymerization resin m2. Thereafter, as shown in FIG. 8D, soft silicone m8 is
injected into the case m1 until the upper surface of the O-ring m9 is reached, and when the soft
silicone m8 cures, the microphone device M is completed. NAKAMURA Yoshitaka, "NAM
Interface Communication", Doctoral Thesis, Nara Institute of Science and Technology Graduate
School, February 2, 2005
[0009]
Since the conventional microphone device M is manufactured manually as described above, it is
necessary to improve the mass production and the quality improvement of the product. For
example, although the microphone element m5 is placed on the pedestal m4 and hard silicone
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m7 is filled around it to fix its position, the hard silicone m7 itself does not have sufficient
hardness to support the microphone element m5. , Fixation was unstable. Since the microphone
element m5 also detects vibration due to its own movement, instability in fixation may affect its
sensitivity characteristics.
[0010]
Moreover, the structure which fixes O-ring m9 on hard silicone m7 and a soundproof sheet using
an adhesive material has inadequate intensity | strength, and may peel in long-term use or
random use. In addition, although the adhesion between the hard silicone m7 and the soft
silicone m8 is good, it is preferable to improve the peel resistance in consideration of the usage
period and usage condition of the product.
[0011]
Furthermore, in order to prevent the wraparound of vibration from behind into the microphone
element m5, the soundproof sheet is processed to create the case m1 or the sound absorbing
rubber material m3 is installed in the case m1, In this configuration, the number of
manufacturing processes is increased and the production efficiency is poor.
[0012]
An object of the present invention is to provide a vibration detection device with high
productivity and sensitivity.
[0013]
The invention according to claim 1 is the vibration detection device, comprising: a cylindrical
case made of resin; and an inner cylindrical portion at one axial end of the cylindrical case, the
first housing having an opening at the one end. A second housing portion communicating with
the first housing portion and formed in the inner cylindrical portion on the other axial end side of
the cylindrical case, and a vibration detection element fitted and fixed in the second housing
portion And a vibration transmitting medium which is housed in the first housing portion and
which physically contacts the vibrating membrane of the vibration detection element via a
communication portion with the second housing portion.
[0014]
The invention according to claim 2 is the vibration detection device according to claim 1, wherein
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the inner surface of the first housing portion is formed such that the inner diameter decreases
from the opening toward the communicating portion with the second housing portion. It is
characterized by being.
[0015]
The invention described in claim 3 is characterized in that, in the vibration detection device
according to claim 1 or 2, an annular groove continuous along the peripheral edge is formed on
the inner surface of the first accommodation portion.
[0016]
The invention described in claim 4 is characterized in that, in the vibration detection device
according to claim 3, a notch is attached to the annular groove.
[0017]
The invention according to claim 5 is the vibration detection device according to any one of
claims 1 to 4, wherein the open end of the first housing portion is the vibration transmission
medium in the axial direction of the cylindrical case. It is characterized by protruding from the
surface.
[0018]
The invention according to claim 6 relates to the vibration detection device according to any one
of claims 1 to 5, wherein the vibration transmission medium has an acoustic impedance
substantially equal to that of a soft tissue of a living body. It features.
[0019]
The invention according to claim 7 is characterized in that in the vibration detection device
according to claim 6, the vibration transmission medium is silicone having an acoustic impedance
substantially equal to that of a soft tissue of a living body.
[0020]
The invention according to claim 8 is the vibration detection device according to any one of
claims 1 to 7, wherein the area of the surface of the vibration transmission medium is larger than
the area of the vibrating film of the vibration detection element. It features.
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[0021]
The vibration detection device according to any one of claims 1 to 8 in the invention according to
claim 9 is provided with a partition having a through hole between the first accommodation
portion and the second accommodation portion, The first storage portion and the second storage
portion are in communication with each other through the through hole.
[0022]
The invention according to claim 10 is the vibration detection device according to claim 9,
wherein the through hole of the partition has an inner diameter smaller than the diameter of the
vibrating film of the vibration detecting element, and the partition and the vibrating film And a
gap, and the vibration transmitting material is filled in the gap.
[0023]
The invention according to claim 11 is characterized in that, in the vibration detection device
according to any one of claims 1 to 10, the vibration detection element is a condenser type
microphone element.
[0024]
The invention according to claim 12 is the vibration detection device according to any one of
claims 1 to 11, wherein the second housing portion has an opening on the other axial end side of
the cylindrical case. It features.
[0025]
According to the present invention, the position of the vibration detection element is fitted and
fixed to the case to stabilize the sensitivity characteristic, and the shock resistance of the
vibration detection device can be improved.
In addition, the production efficiency can be improved by making the case a resin molded
product in which the vibration detection element can be inserted in advance and simplifying the
manufacturing process.
[0026]
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<Structure of Vibration Detection Device> Hereinafter, a microphone device to which the present
invention is applied will be described with reference to the drawings.
FIG. 1 is a plan view of the microphone device 1, and FIG. 2 is a cross-sectional view taken along
the line II-II of FIG.
[0027]
As shown in FIGS. 1 and 2, the microphone device 1 includes the microphone element 3 in the
case 2, and the upper portion of the microphone element 3 is filled with silicone 4 and abuts on
the diaphragm 33 of the microphone element 3. There is.
[0028]
The case 2 is a resin molded product previously molded into a shape shown in FIG. 3 by synthetic
resin such as ABS resin, polystyrene resin, acrylic resin, rubber-like, resin-like hard silicone or the
like.
In addition, in consideration of impact resistance, not a resin but a metal with high hardness may
be used as the material, but in order to reduce the weight, it is preferable to use the resin.
[0029]
As shown in FIG. 3, a cylindrical second accommodation portion 23 for accommodating the
microphone element 3 is formed in the center portion of the lower side of the cylinder in the case
2.
The second housing portion 23 has a diameter slightly smaller than the diameter of the
microphone element 3, and when the microphone element 3 is pressed into the second housing
portion 23, the microphone element 3 is fitted and fixed in the second housing portion 23. It is
formed as.
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Further, the bottom surface of the second accommodation portion 23 is opened, and the
microphone element 3 can be inserted from this opening portion.
The opening portion is opened such that the area of the opening portion is larger than the
bottom area of the microphone element 3 so that the microphone element 3 can be easily
inserted.
Further, as shown in FIG. 2, this opening is covered by attaching a plate-like bottom lid 5 to the
bottom of the case 2.
The bottom cover 5 is provided with a through hole for passing the cable C of the microphone
element 3.
[0030]
An annular cavity is formed around the second housing portion 23.
This is because of resin molding.
That is, when the resin molding of the case 2 is performed, a dent called sink mark is likely to
occur at a portion where the resin density is high.
In Case 2 shown in the present embodiment, in order to avoid this, the periphery of the second
accommodation portion 23 is made hollow so that the resin density does not increase.
In addition, although it is set as cyclic | annular cavity in this embodiment, it does not specifically
limit what kind of cavity is formed.
[0031]
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On the other hand, a first accommodating portion 26 having an opening on the upper end side is
formed at the cylindrical upper end of the case 2.
A partition having a through hole is provided between the first accommodating portion 26 and
the second accommodating portion 23, and the first accommodating portion 26 and the second
accommodating portion 23 communicate with each other through the through hole.
The partition wall also functions as a locking member 24 that locks the insertion of the
microphone element 3 into the second housing portion 23.
[0032]
The first accommodating portion 26 is formed in a mortar shape whose inner diameter decreases
from the opening on the upper end side toward the second accommodating portion 23.
In addition, although the example of mortar shape was demonstrated in this embodiment, it is
good also as a parabola shape or hemispherical shape by curving the inner surface. On the inner
surface of the first housing portion 26, in order to enhance the adhesion between the silicone 4
filled in the first housing portion 26 and the case 2, an annular groove 21 continuous along the
peripheral edge is formed. Further, three notches 22 are provided at the same intervals along
with the grooves 21. The notch 22 is provided to improve the flowability of the silicone 4 into
the groove 21. The number is not limited to three, but in order to flow silicone 4 uniformly and
rapidly, it is preferable to provide a plurality of notches 22 in a well-balanced manner.
[0033]
Further, as shown in FIG. 2, the open end 25 of the first accommodating portion 26 shown in FIG.
3 is formed so as to project from the surface of the silicone 4 accommodated in the first
accommodating portion 26. The surface of the silicone 4 is a contact surface to the skin, but at
the time of the contact to the skin, the vibration due to the pressing of the contact is also
transmitted to the microphone element 3 without much, so this is detected as noise. The reason
for causing the open end 25 to project is to suppress noise generated when contacting the skin,
and has the function of relieving an excessive pressure applied to the microphone element 3
through the silicone 4.
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[0034]
The first accommodating portion 26 is filled with silicone 4 which is a vibration transmitting
medium, and the silicone 4 is also filled on the side of the microphone element 33 through a
portion communicating with the second accommodating portion 23. The vibrating membrane 33
abuts. The silicone 4 has its surface in contact with the soft tissue of the living body to be
subjected to vibration detection, and conducts sound vibration from the soft tissue to the
microphone element 3. Here, the soft tissue of the living body refers to a solid tissue having a
certain degree of elasticity, such as skin tissue, muscle tissue, fat tissue, organs and the like.
[0035]
The material of the silicone 4 is selected to have an acoustic impedance substantially similar to
that of soft tissue of a living body serving as a transmission medium of sound vibration. The
acoustic impedance is determined by the product of the density ρ of the medium and the
propagation velocity C. As the acoustic impedances of the respective materials differ between
two adjacent materials, strong sound reflection occurs at the interface where the two materials
contact. Therefore, in order to mediate the sound propagating through the soft tissue of the
living body up to the vibrating membrane 33 of the microphone element 3 without reflecting and
attenuating as much as possible, it is preferable to use a material having an acoustic impedance
equivalent to that of the soft tissue. It becomes the condition of the sensitivity improvement of
detection.
[0036]
The acoustic impedance of soft tissue is known to show approximately the same value although
there is a slight difference depending on the tissue. The specific acoustic impedance value of the
soft tissue changes depending on the measurement environment, but the fat tissue is about 1.3
× 10 <6> (kg / m <2> s). When actually selecting the material of silicone 4, one having the best
acoustic impedance experimentally or empirically may be selected.
[0037]
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The microphone element 3 is a vibration detection element that detects a vibration conducted via
the silicone 4 filled in the first housing portion 26 and converts it into an electric signal. FIG. 4
shows an enlarged sectional view of the microphone element 3. As shown in FIG. 4, the
microphone element 3 is a condenser type microphone element in which the diaphragm 33, the
spacer 34, the back electrode 35, and the FET (Field Effect Transistor) 36 are accommodated in a
cylindrical case 31. is there.
[0038]
The upper center portion of the case 31 is opened in a circular shape, and a sound receiving hole
37 is formed. A washer 32 having the same hole diameter as the sound receiving hole 37 is
provided inside the upper surface of the case 31, and the vibrating film 33, the spacer 34, and
the back electrode 35 are stacked and attached to the washer 32.
[0039]
A substrate 38 is installed above the bottom of the case 31 with a gap from the bottom of the
case 31, and a spacer 39 is installed between the substrate 38 and the back electrode 35. The
spacer 32 and the like attached with the vibrating film 33 are supported by the spacer 39.
Further, an FET 36 is installed in the inner hole of the spacer 39 on the substrate 38, and the
electrode of the FET 36 is wired to the back electrode 35, a cable C connected to the outside, and
the like.
[0040]
<Method of Manufacturing Microphone Device> A method of manufacturing the microphone
device 1 will be described with reference to FIG. First, as shown in FIG. 5A, the case 2 which is a
resin molded product is prepared, and the microphone element 3 is inserted into the second
accommodation portion 23 from the bottom opening of the case 2. The cable C is soldered and
wired in advance for the microphone element 3. If soldering is performed after housing the
microphone element 3 in the second housing portion 23, the heat at the time of soldering may be
trapped in the second housing portion 23, and as a result, the microphone element 3 may be
destroyed by heat There is In addition, if soldering is performed after the silicone 4 is filled, it is
also one of the reasons that the adhesion between the silicone 4 and the vibrating film 33 of the
04-05-2019
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microphone element 3 is deteriorated by the heat. In addition, if measures against heat are taken,
it is also possible to perform soldering after inserting the microphone element 3.
[0041]
Then, when the microphone element 3 is press-fitted until it is locked by the locking portion 24,
the bottom lid 5 is attached to the bottom of the case 2 as shown in FIG. 5 (b). The bottom lid 5
may be attached using an adhesive, or the bottom lid 5 and the case 2 may be formed into a
shape in which both are fitted and inserted. The bottom lid 5 may be attached in the final step. In
this case, since the soft silicone 4 is also completely filled and then attached, the soft silicone 4
needs to be attached after being cured to some extent. Next, the first accommodation portion 26
of the case 2 is filled with silicone 4. At the time of filling, the silicone 4 is poured from the
inclined portion of the inner surface of the first housing portion 26 so that the silicone 4 does
not drop directly to the microphone element 3. At this time, the interface of the silicone 4 rises in
accordance with the amount of dripping, gradually fills the first accommodation portion 26, and
flows into the notch 22. The silicone 4 flowing into the notch 22 enters the groove 21 and joins
with the interface of the silicone 4 filling the inside of the first accommodating portion 26 by
further filling.
[0042]
Here, the case where the notch part 21 is not provided is considered. When the silicone 4
reaches the boundary with the groove 21, its surface tension temporarily prevents the silicone 4
from entering the groove 21. Furthermore, silicone 4 enters the groove 21 by increasing the
dripping amount of silicone 4 and applying pressure more than the surface tension, but the
flowability of the silicone 4 decreases around the groove 21 during that time, so The silicone 4
around 21 is cured. That is, there is a possibility that the curing of the silicone 4 in the first
housing portion 26 becomes uneven. In addition, it is conceivable that when the groove 21 is
filled with the silicone 4, if the droplet is excessively dropped to exceed the surface tension, the
interface exceeds the position to be originally filled.
[0043]
However, in the case 2 in the present embodiment, since the notch 22 is attached to the groove
21, as shown in FIG. 5 (b), the silicone 4 comes first to the notch 22 at a position lower than the
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groove 21. It will enter. Since the surface tension of the silicone 4 is relieved triggered by this
and the silicone 4 entering from the notch 22 enters the groove 21, the low fluidity of the
silicone 4 generated by the formation of the groove 21 can be improved.
[0044]
The filling amount of the soft silicone 4 is determined in advance so that the soft silicone 4 is
filled up to the filling reference position. The position serving as the filling reference is a position
lower than the projecting portion of the open end 25 of the first accommodation portion 26, for
example, 1 mm below. Then, the soft silicone 4 is filled by a determined amount, and when the
silicone 4 is hardened with time, the microphone device 1 is completed.
[0045]
<Operation of Microphone Device 1> When using the microphone device 1, the surface (exposed
surface) of the silicone 4 is brought into contact with the soft tissue of the living body. At this
time, since the sensitivity of the microphone device 1 changes depending on the position of
contact, it is sufficient to find an empirically sensitive position. The results of the experiment
show that the posterior mastoid area of the ear is optimal.
[0046]
At the time of contact, when the open end 25 of the case 2 protruding from the surface of the
silicone 4 first contacts the soft tissue, the soft tissue in the open end 25 swells by the contact
pressure and contacts the surface of the silicone 4. The vibration transmitted from the soft tissue
of the living body in contact is conducted to the microphone element 3 through the silicone 4. In
the microphone element 3, an electric signal is generated by the FET 36 according to the
vibration received by the diaphragm 33, and the electric signal is transmitted to the outside
through the cable C.
[0047]
As described above, according to the present embodiment, the case 2 for housing the
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microphone element 3 is a resin molded product, and the microphone element 3 is fitted and
fixed. And the shock resistance of the microphone device 1 itself can be improved. Moreover, by
making case 2 into a molded article beforehand, the manufacturing process of processing a
soundproof sheet like the conventional and producing a case can be skipped, and productive
efficiency can be improved.
[0048]
Further, a first accommodating portion 26 is provided in the case 2, and the first accommodating
portion 26 is filled with silicone 4 having an acoustic impedance substantially equal to that of a
soft tissue of a living body. By bringing the surface of the silicone 4 into contact with the soft
tissue, it is possible to transmit the vibration from the soft tissue to the microphone element 3
without reflecting and attenuating as much as possible. Therefore, the vibration detection
sensitivity of the microphone device 1 can be improved.
[0049]
Further, since the first housing portion 26 communicates with the second housing portion 23
and is formed in a mortar shape with the communication portion as a center bottom portion, the
inner surface of the first housing portion having this inclination serves as a reflection plate for
sound vibration. The vibration detection sensitivity of the microphone device 1 can be further
improved.
[0050]
In addition, since the second housing 23 in which the bottom portion is opened is provided in the
case 2 and the microphone element 3 is formed so as to be insertable into the second housing
23, the mounting of the microphone element 3 becomes easy.
Furthermore, since the locking portion 24 is provided in the communication portion between the
second housing portion 23 and the first housing portion 26, the microphone element 3 is
inserted until the locking portion 24 locks the microphone element 3 The element 3 can be
accurately accommodated in the second accommodation portion 23.
[0051]
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Further, since the open end 25 is formed to project from the surface of the silicone 4, the
pressure when the microphone device 1 is in contact with the soft tissue of the living body can
be relieved by the open end 25. Can be prevented. The installation of O-rings increases the
number of parts and manufacturing processes, and may be detached if the adhesive strength is
weak. Therefore, as in the present embodiment, by carrying out the function of the O-ring in Case
2, improvement in production efficiency and cost reduction can be achieved.
[0052]
Further, by providing the groove 21 in the inclined portion of the inner surface of the first
housing portion 26, the contact area between the silicone 4 and the case 2 can be increased, and
the adhesion between the silicone 4 and the case 2 can be strengthened. it can.
[0053]
Further, since the notch 22 is provided adjacent to the groove 21, the fluidity of the silicone 4
can be improved, and stagnation of the filling speed due to the surface tension of the silicone 4
can be avoided.
Although the curing speed of silicone 4 may be high depending on the material used, it is
possible to induce the penetration of silicone 4 into groove 21 by notch 22, and it becomes
possible to carry out the filling of silicone 4 uniformly and rapidly. .
[0054]
The sound receiving hole 37 of the microphone element 3 is equal to or larger than the inner
diameter of the washer 32, and the opening area of the first accommodation portion 26 is equal
to or larger than the area of the diaphragm 33 of the microphone element 3. Thereby, the loss of
the sound vibration which conducts silicone 4 can be prevented, and the detection sensitivity can
be improved.
[0055]
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<Modification Example> The above embodiment is a preferred example to which the present
invention is applied, and the present invention is not limited to this. For example, in the above
embodiment, a partition wall is provided between the first housing portion 26 and the second
housing portion 26 and used as the locking portion 24. However, this partition wall is excluded
and the first housing portion 26 and the second housing portion are communicated. It is also
possible to let In this case, the microphone element 3 can be inserted into the second
accommodation portion 23 from any opening on the first accommodation portion 26 side or the
second accommodation portion 23 side. Further, at this time, the locking portion 24 may be
provided in the opening portion on the bottom side of the second housing portion 23 to lock the
insertion of the microphone element 3 from the first housing portion 26 side.
[0056]
Further, as shown in FIG. 6, the locking portion 24 may be further extended to partially cover the
sound receiving hole 37 of the microphone element 3. The case 31 and the washer 32 intervene
between the locking portion 24 and the vibrating film 33, and there is a gap. By filling the gap
with the silicone 4, the locking portion 24 of the silicone 4 is obtained. It has a shape that fits
with the Therefore, the silicone 4 has a structure in which it is difficult to peel off the case 2, and
the peel resistance can be further improved.
[0057]
In the above embodiment, a condenser type microphone element with high sensitivity is applied
as the microphone element 3 to achieve miniaturization, but in the present invention, other
microphone elements such as a piezoelectric element can also be applied.
[0058]
Moreover, in the said embodiment, although the bottom plate 5 used the simple plate-shaped
member, it is good also as applying the bottom lid 5a as shown in FIG.
The bottom lid 5 a is a resin molded product molded to fit in the shape on the bottom side of the
case 2, and has a shape in which a toroidal protrusion is provided on a plate-like substrate. By
attaching the bottom cover 5 a to the bottom portion of the case 2, the hollow around the second
accommodation portion 23 is filled with the bottom cover 5 a.
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[0059]
Furthermore, in the above configuration, the cable C is wired directly to the microphone element
3. However, as shown in FIG. 6, the microphone element 3 is connected to the terminal T1, the
bottom lid 5a is connected to the terminal T2 and this terminal T2, and the cable C is connected.
A terminal T3 to be wired may be provided, and when the bottom lid 5a is attached to the case 2,
the terminal T1 of the microphone element 3 may be in contact with the terminal T2 of the
bottom lid 5a to enable cable wiring. That is, when the bottom cover 5a in which the cable C is
wired to the terminal T3 is attached to the case 2, the terminal T1 of the microphone element 3
and the terminal T2 of the bottom cover 5a are in contact and the terminal T2 is connected to
the terminal T3. , And the microphone element 3 can be cabled. According to this configuration,
it is not necessary to directly wire the microphone element 3a, and cable wiring can be
facilitated, and the microphone element 3 can be protected from high heat during wiring.
[0060]
It is a top view of a microphone device to which the present invention is applied. FIG. 2 is a crosssectional view taken along line II-II of FIG. It is sectional drawing of the case of a microphone
apparatus. It is an expanded sectional view of a microphone element. It is a figure explaining the
preparation methods of a microphone element. It is sectional drawing of the microphone
apparatus which concerns on other embodiment. It is sectional drawing of the conventional
microphone apparatus. It is a figure explaining the preparation methods of the conventional
microphone apparatus.
Explanation of sign
[0061]
Reference Signs List 1 microphone device 2 case 21 groove 22 cutout 23 second housing portion
24 locking portion 25 opening end 26 first housing portion 3 microphone element 33
diaphragm 37 sound receiving hole 4 silicone 5 bottom lid
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