JP2014216782

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DESCRIPTION JP2014216782
Abstract: A microphone / cover composite member capable of reducing the manufacturing cost
and advantageously retaining the performance of the microphone element by eliminating the
need for employing a manual assembly process of the microphone element and the cushion
cover in the manufacturing process. Provided is a method of manufacturing a microphone cover
composite member. A cushion cover (14) constituting a microphone cover composite member is
formed by injection molding of an elastomeric material (74), and a gate (42) for injection
molding of the elastomeric material (74) is a portion out of the microphone element (12). And
allow the flow of elastomeric material 74 injected through the gate 42 not to collide directly with
the microphone element 12 and wrap around the periphery of the microphone element 12.
[Selected figure] Figure 7
Microphone-cover composite member and method of manufacturing the same
[0001]
The present invention relates to a microphone cover composite member and a method of
manufacturing the same, and in particular, a microphone cover composite member in which a
microphone element and a cushion cover are integrally assembled without using a manual
assembling process, and that are advantageous Relates to the method of manufacturing.
[0002]
In recent years, in vehicles such as automobiles, voice recognition systems for performing
settings of audio and car navigation systems by voice, hands-free call systems, etc. are
increasingly installed, and some of these systems As a result, a microphone assembly as an audio
acquisition device is installed in a vehicle, which includes a microphone element for collecting
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audio and converting it into an electrical signal.
[0003]
By the way, as such a microphone assembly, those disclosed in JP-A-2005-306278, JP-A-200862885, JP-A-2010-89749, etc. may be mentioned, and The microphone element makes it
difficult to pick up vibrations and noise while the vehicle is traveling and noises from the air
conditioner, etc., and realizes a voice input with good quality, so the outer peripheral part is a
cover made of a soundproof member such as rubber. It is intended to be used in an enclosed
state.
Specifically, as shown in FIG. 2 of JP-A-2008-62885, the microphone element is housed in the
element cover and configured as a microphone-cover assembly, and further, the microphonecover assembly is Is held by a member such as a retainer or a microphone case, and is mounted
at a predetermined position in the vehicle interior of the vehicle.
[0004]
Thus, conventionally, the microphone element and the cover have been manufactured as
separate members, and they have been assembled and used. However, the assembly is a manual
operation, so-called hand assembly It will be done by the process.
For this reason, the cost and the number of steps for assembling the microphone element and the
cover increase, and the problem of rising costs for manufacturing the microphone / cover
assembly and hence the microphone assembly is inherent. Also, the presence of such manual
assembly steps is an obstacle to the automation of the manufacture of such microphone
assemblies.
[0005]
Therefore, in order to solve such a problem, the cover is integrally molded to the microphone
element by a so-called insert molding method in which the cover forming material is injectionmolded in the presence of the microphone element, and the microphone element and the cover
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are It is conceivable to manufacture as a one-piece product. However, when the microphone
element is placed in the mold cavity of the mold and injection molding of the cover is performed,
such microphone element receives its heat directly from the cover forming material in the molten
state, thereby causing abrupt changes. When heated or exposed to a high temperature exceeding
the heat-resistant temperature of the microphone element for a relatively long time, the
performance of the microphone element may be degraded or destroyed.
[0006]
JP, 2005-306278, A JP, 2008-62885, A JP, 2010-89749, A
[0007]
Here, the present invention has been made in the background of such circumstances, and the
problem to be solved is that it is not necessary to adopt the process of manually assembling the
microphone element and the cushion cover in the manufacturing process. To provide a
microphone cover composite member in which the manufacturing cost can be reduced and the
performance of the microphone element is advantageously maintained, and such a microphone
cover composite member is industrially suitable. Also provide a method for manufacturing in an
advantageous manner.
[0008]
Further, in the present invention, in order to solve such problems, a microphone element for
collecting sound and converting it into an electric signal, and a cushion integrally attached so as
to surround the outer peripheral portion of the microphone element A microphone cover
composite member comprising a cover, the cushion cover being formed by injection molding an
elastomeric material in the presence of the microphone element, and a gate for injection molding
of the elastomeric material By positioning the microphone element away from the microphone
element, the flow of the elastomeric material ejected through the gate does not directly collide
with the microphone element and wraps around the outer periphery of the microphone element.
The microphone cover characterized in that the cushion cover is integrally formed. The
Complexes member is for its basic configuration.
[0009]
According to one of the preferable embodiments of the microphone cover composite member
according to the present invention, the guide portion protruding from the cushion cover is
integrally formed with the cushion cover and a lead extending from the microphone element A
wire is embedded in the guide and taken out of the cushion cover.
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[0010]
Further, in the present invention, in order to solve the problems relating to the above-mentioned
manufacturing method, a microphone element for collecting voice and converting it into an
electric signal, and integrally attached so as to surround the outer peripheral portion of the
microphone element A method of manufacturing a microphone cover composite member
comprising the above cushion cover, wherein the microphone element is accommodated to form
a molding space in which the cushion cover can be molded around the outer periphery of the
microphone element. Said injection molding using an injection mold with a moldable cavity, and
opening a gate for injecting an elastomeric material into the molding space part out of the top of
a microphone element housed in said mold cavity Provided in the mold, the flow of elastomeric
material injected through the gate does not directly impinge on the microphone element In this
manner, the cushion cover is integrally formed on the outer peripheral portion of the
microphone element by being wound around the outer peripheral portion of the microphone
element. Also, it is the gist of the invention.
[0011]
Thus, in the microphone cover composite member according to the present invention, the
cushion cover is formed around the periphery of the microphone element by injection molding
an elastomeric material in the presence of the microphone element, and such microphone Since
the cushion cover is integrally molded to the element, no manual assembling process for
assembling the microphone element and the cushion cover can be made in the process of
manufacturing the microphone cover composite member. This makes it possible to
advantageously reduce the manufacturing cost of the microphone-cover composite member.
[0012]
Also, in the microphone cover composite member according to the present invention, a gate for
injection molding of the elastomeric material is located at a molding site that is off the top of the
microphone element, and the elastomeric material injected through the gate The flow first strikes
the gate facing surface of the mold cavity of the mold so that it does not directly collide with the
microphone element, after which the injected elastomeric material wraps around its periphery As
a result, the cushion cover is formed.
For this reason, the elastomeric material in the molten state is brought into contact with the
microphone element after the material temperature is effectively lowered by being brought into
contact with the molding cavity surface of the mold used for injection molding. However, the heat
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of such an elastomeric material effectively suppresses rapid heating of the microphone element,
and also advantageously suppresses or prevents high temperature conditions beyond the heatresistant temperature of the microphone element. It can be advantageously prevented that the
performance of such a microphone element is degraded or destroyed in order to
[0013]
Furthermore, even in the method of manufacturing the microphone-cover composite member
according to the present invention, it is possible to advantageously obtain substantially the same
effects as the effects obtained in the above-described microphone-cover composite member
according to the present invention. Thus, it is possible to obtain industrially advantageous
microphone / cover composite members.
[0014]
It is plane explanatory drawing which shows an example of the microphone cover composite
member which has a structure according to this invention.
FIG. 2 is a cross-sectional explanatory view taken along line AA in FIG.
It is BB sectional drawing in FIG.
FIG. 7 is an explanatory cross-sectional view showing an example of a device for manufacturing
the microphone-cover composite member shown in FIG. 1 in a cross-sectional view
corresponding to FIG.
FIG. 12 is an explanatory cross-sectional view showing an example of a process of manufacturing
the microphone / cover composite member shown in FIG. 1 in a mode corresponding to FIG. 4, in
which the mold is closed and the microphone element is accommodated and molded around it
The state which formed the cavity is shown.
FIG. 6 is an explanatory view of a cross-sectional main part along a line CC in FIG. 5;
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FIG. 6 is an enlarged cross-sectional explanatory view of a portion D in FIG. 5 showing a step
performed subsequent to the step shown in FIG. 5, wherein (a) is a state before the start of
injection of the elastomeric material; The state during injection and filling of the material, (c)
shows the state in which the injection-filled elastomeric material has cooled and solidified,
respectively. It is cross-sectional explanatory drawing which shows an example of the process of
manufacturing the microphone cover composite member shown by FIG. 1 in the cross-sectional
form corresponding to FIG. 2, Comprising: (a) is closed mold of a shaping ¦ molding die and
accommodates a microphone element (B) shows a state in which the injection-filled elastomeric
material has cooled and solidified, respectively. It is cross-sectional partial explanatory drawing
which shows the process implemented following the process shown by FIG. 7, Comprising: The
state which the mold was open ¦ released is shown. It is perspective explanatory drawing which
shows the vehicle-mounted microphone apparatus which has the microphone cover composite
member shown by FIG. 1 as one component. FIG. 11 is an E-E cross-sectional explanatory view in
FIG. FIG. 11 is a cross-sectional explanatory view taken along line FF in FIG. It is GG sectional
partial explanatory drawing in FIG.
[0015]
Hereinafter, in order to clarify the present invention more specifically, embodiments of the
present invention will be described in detail with reference to the drawings.
[0016]
First, in FIGS. 1 to 3, an example of a microphone-cover composite member having a structure
according to the present invention is shown in the form of a plan view or a sectional view,
respectively.
Here, a cushion cover 14 is integrally formed on the microphone-cover composite member 10 so
as to surround the outer peripheral portion of the disk-shaped microphone element 12 and
extend onto the surfaces on both sides. Then, as shown in FIG. 1, the microphone-cover
composite member 10 has a shape in which one side of a rectangular shape is formed in a
semicircular shape in a plan view. Further, in the cushion cover 14, a guide portion 16 is
integrally formed so as to project from a semicircular tip, and in the guide portion 16, lead wires
18, 18 extending from the microphone element 12 are embedded. It is taken out from the
cushion cover 14.
[0017]
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Here, the microphone element 12 to be used is conventionally known, has a disk shape of a
predetermined thickness, and has a function of collecting sound and converting it into an electric
signal. Inside the microphone element 12, a vibrator 24 for collecting voice, a circuit board (not
shown) for converting the collected voice into an electric signal, and the like are disposed. Side
surfaces (cylindrical wall surfaces) are formed by thin metal cylinders 26 disposed around the
periphery. Furthermore, the surface of the microphone element 12 (the surface shown in FIG. 1)
is covered with the non-woven fabric 22 and, as shown in FIG. 2, on the back surface, two leads
for sending electrical signals. 18, 18 (only one is shown in FIG. 2) are soldered.
[0018]
On the other hand, the cushion cover 14 is formed by injection molding of a known elastomeric
material and, as shown in FIG. 1, has a shape in which one side of the rectangular shape is
formed in a semicircular shape in plan view. It is presenting. Specifically, the cushion cover 14 is
composed of a rectangular shaped portion 30 and a semicircular shaped portion 32, and the
cross sections of the rectangular shaped portion 30 and the semicircular shaped portion 32 are
substantially U-shaped, respectively. The front and back surfaces of the microphone element 12
are covered with a predetermined length radially inward from the circumferential surface.
Thereby, the outer peripheral part of the microphone element 12 is surrounded by the cushion
cover 14 in the form in which the predetermined ranges of the central part on the front surface
side (the surface shown in FIG. 1) and the rear surface side of the microphone element 12 are
exposed. Is configured as.
[0019]
Then, as shown in FIGS. 1 and 3, on the surface 36 of the cushion cover 14 positioned on the
surface side of the microphone element 12, the gate mark 40 is positioned so as to be positioned
in one corner of the rectangular shaped portion 30. It remains. In the present embodiment, as
described later, when the cushion cover 14 is formed by injection molding of an elastomeric
material, a rectangle where the gate (42) for the injection molding is located out of the
microphone element 12 The gate mark 40 remains at such a position because it is located at the
corner formation portion of the shape portion 30.
[0020]
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Further, from the central portion that is the tip of the arc of the semicircular shaped portion 32
in the cushion cover 14, the cylindrical guide portion 16 protrudes radially outward in a form in
which a part of the back surface 38 protrudes. It is integrally molded so as to extend. Then, as
shown in FIG. 2, the lead wires 18, 18 extending from the microphone element 12 are embedded
in the guide portion 16 and taken out of the cushion cover 14 to the outside.
[0021]
By the way, such a microphone cover composite member 10 is manufactured as follows.
[0022]
First, FIG. 4 shows an example of an injection mold preferably used in manufacturing the
microphone cover composite member 10.
The injection mold 46 used therein has an upper mold 50 and a lower mold 52 which are
disposed to face each other in the vertical direction. In the center of the upper surface of the
lower mold 52 (the surface facing the upper mold 50), a cylindrical microphone element holding
convex portion 54 projecting at a predetermined height in the molding cavity is provided. A
cushion cover forming recess 56 is provided. The outer diameter of the microphone element
holding convex portion 54 is smaller than the outer diameter of the microphone element 12 by a
predetermined amount, and a relief space 57 having a circular recess shape is provided at the
central portion. Further, the cushion cover forming recess 56 has an inner surface shape
corresponding to an outer surface shape of a portion on the back surface 38 side of the desired
cushion cover 14.
[0023]
On the other hand, similarly to the lower mold 52 as described above, a cylindrical microphone
element holding convex portion which protrudes at a predetermined height in the molding cavity
also at the central portion of the lower surface (the surface facing the lower mold 52) of the
upper mold 50 58 is provided, around which a cushion cover forming recess 60 is provided. The
cushion cover forming recess 60 has an inner surface shape corresponding to the outer surface
shape of the target surface 36 side portion of the cushion cover 14.
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[0024]
Thus, in the injection mold 46, the upper mold 50 and the lower mold 52 are closed by the
relative movement of the lower mold 52 relative to the upper mold 50 by a clamping device (not
shown). Meanwhile, the upper mold 50 and the lower mold 52 are opened by the relative
movement of the lower mold 52 relative to the upper mold 50 by the clamping device. Then,
when the upper mold 50 and the lower mold 52 are closed, the microphone element 12 is held
between the microphone element holding convex portion 58 of the upper mold 50 and the
microphone element holding convex portion 54 of the lower mold 52. Between the cushion cover
forming recess 60 of the upper mold 50 and the cushion cover forming recess 56 of the lower
mold 52, a molding cavity (62) having a shape corresponding to the outer surface shape of the
cushion cover 14 is formed. It has become so.
[0025]
The upper mold 50 of the injection mold 46 is provided with an injection device insertion hole
64 for inserting the injection device 48, and has a stepped hole shape including a large diameter
portion 64a and a small diameter portion 64b. ing. Then, on the tip side of the small diameter
portion 64b (facing surface side with the lower die 52), a nozzle touch surface 66 consisting of a
tapered inclined surface is formed, and at the tip, a circular gate 42 is formed. It is formed. The
gate 42 opens at the bottom of the cushion cover forming recess 60 in the upper mold 50, and is
communicated with the molding cavity 62 in the mold closed state of the upper mold 50 and the
lower mold 52.
[0026]
Further, the upper mold 50 is provided with a degassing space 68 and a degassing passage 70.
The degassing space 68 has a circular recessed shape and is provided so as to open at the central
portion of the surface facing the lower mold 52 of the microphone element holding convex
portion 58. Further, the degassing passage 70 has a circular cross-section over the entire length,
and a small diameter inclination extending obliquely upward so as to avoid the injection device
insertion hole 64 in the upper die 50 and the vertical passage 70a extending a predetermined
distance upward in the vertical direction. A passage 70b and a large diameter inclined passage
70c are provided, and the vertical passage 70a is in communication with the central portion of
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the degassing space 68, while the large diameter inclined passage 70c is in communication with
the outside of the upper die 50. The degassing space 68 is open to the atmosphere.
[0027]
The injection device 48 has a known structure such as a plunger type, an in-line screw type, a
pre-plunger type, a screw pre-plunger type or the like which can eject an elastomeric material for
forming the cushion cover 14. It is disposed above 50 in a state of extending in the vertical
direction. Further, under such an arrangement state, the nozzle 72 provided at the tip end side
portion of the injection device 48 is inserted into the injection device insertion hole 64 provided
in the upper mold 50. Then, as described later, the tip surface of the nozzle 72 is brought into
contact with the nozzle touch surface 66 under the mold closing state of the injection molding
die 46, and the elastomer in the plasticized molten state injected from the injection device 48
Material (74) is introduced into the mold cavity (62) through the gate 42 (see FIG. 7).
[0028]
Then, when manufacturing the target microphone-cover composite member 10 using the
injection molding die 46 having the above-described structure, the operation is carried out, for
example, according to the following procedure.
[0029]
That is, first, as shown in FIG. 5, the upper mold 50 and the lower mold 52 of the injection mold
46 are closed, and the cushion cover forming recess 60 of the upper mold 50 and the cushion
cover of the lower mold 52 are formed. The recess 56 causes a shaped cavity 62 to be formed
around the periphery of the microphone element 12.
At this time, the microphone element 12 is held between the microphone element holding convex
portion 58 of the upper mold 50 and the microphone element holding convex portion 54 of the
lower mold 52 and is disposed in the injection mold 46. The soldered portions of the lead wires
18, 18 on the back side of the microphone element 12 are accommodated in the relief space 57
provided on the microphone element holding convex portion 54 of the lower mold 52. And here,
as is apparent from FIGS. 5 and 6, the gate 42 for injection molding of the elastomeric material is
positioned at the injection molding die 46 (upper die 50) portion which is removed from above
the microphone element 12 There is.
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[0030]
Thus, in the state where the microphone element 12 is disposed, as shown in FIGS. 7A and 7B,
the elastomer material 74 in a plasticized molten state is injected from the injection device 48 to
form the molding cavity 62. It is filled inside. 7 (a) shows the state before the injection start of
the elastomeric material 74. Here, the arrow in the drawing indicates the direction in which the
elastomeric material 74 is injected from the gate 42. There is.
[0031]
Also shown in FIG. 7 (b) is the injection filling of the elastomeric material 74. There, the flow of
elastomeric material 74 injected through the gate 42 will be directed in the direction indicated
by the dashed double-dotted line and the open arrow in the figure. That is, since the gate 42 is
disposed so as to open at the injection molding die 46 (upper die 50) portion out of the
microphone element 12 housed in the molding cavity 62, the flow of the elastomeric material 74
First comes into contact with the gate 42 facing surface (the inner surface of the cushion cover
forming recess 56 of the lower die 52) of the molding cavity 62 of the injection molding die 46,
and does not directly collide with the microphone element 12 . For this reason, the elastomeric
material 74 in the plasticized molten state comes into contact with the microphone element 12
after the temperature is lowered to some extent by contacting the molding cavity 62 surface of
the injection mold 46. Thereafter, the injected elastomeric material 74 is loaded into the molding
cavity 62 of the injection mold 46 so as to be wrapped around the outer periphery of the
microphone element 12.
[0032]
Furthermore, with the injection and filling of the elastomeric material 74, the gas (air) present in
the molding cavity 62 will be pushed out to the degassing space 68, but such gas will pass
through the degassing passage 70. , Is released to the atmosphere outside the mold [see the real
thin arrow in Figure 7 (b)]. Moreover, in the present embodiment, the diameter of the degassing
space 68 is larger than the diameter of the vibrator 24 incorporated in the microphone element
12. For this reason, the pressure of the extruded gas squeezes the vibrator 24 and
advantageously prevents or impairs its function.
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[0033]
Then, as shown in FIG. 7C, the cushion cover 14 is integrally molded to the microphone element
12 by cooling and solidifying the elastomer material 74 injected and filled in the molding cavity
62. It becomes.
[0034]
In addition, the form which integrally forms the guide part 16 in such a cushion cover 14 by
injection molding is shown by FIG.
That is, as shown in FIG. 8A, when the upper die 50 and the lower die 52 are closed, the guide
portion forming recess 60a which is a part of the cushion cover forming recess 60 of the upper
die 50 and A guide portion forming cavity 62a having a shape corresponding to the outer surface
shape of the guide portion 16 is formed between the guide portion forming recess 56a which is a
part of the cushion cover forming recess 56 of the lower mold 52. In addition, lead wires 18, 18
extending from the microphone element 12 are provided in the lead wire receiving recess 75a,
75a provided on the upper surface of the lower mold 52 and the lead wire receiving recess
provided in the lower mold element holding convex portion 54. It is hold ¦ maintained by 75b
and 75b, and it is arrange ¦ positioned so that it may penetrate in the guide part formation cavity
62a. [In FIG. 8 (a) and (b), only one each is shown]. Then, as described above, the injection
molding of the elastomeric material 74 is performed, and as shown in FIG. 8B, the guide portion
16 is integrally molded on the cushion cover 14 with the lead wires 18 embedded therein. The
[0035]
Thereafter, when the solidification of the injected elastomeric material in the injection mold 46 is
completed, the upper mold 50 and the lower mold 52 of the injection mold 46 are opened as
shown in FIG. At this time, the cushion cover 14 is separated at the gate 42 by the retraction of
the injection device 48, and the gate marks 40 remain on the surface 36 of the cushion cover 14.
In the case where a so-called direct gate system is adopted in which the elastomer material 74 is
injected and filled directly into the molding cavity 62 from the nozzle 72 of the injection device
48 through the gate 42 as in this embodiment, a runner or sprue. And so on, and thus the
process for separating such extra members from the cushion cover 14 is unnecessary, so the
manufacturing cost of the microphone cover composite member 10 There is an advantage that it
is possible to reduce the
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[0036]
As described above, the cushion cover 14 is formed by forming the cushion cover 14 around the
outer periphery of the microphone element 12 by the injection molding operation of the
elastomeric material 74 in the presence of the microphone element 12. The microphone cover
composite member 10 is formed simultaneously with the molding operation of the cushion cover
14 from the point of being integrally molded with the microphone element 12, and the
microphone element 12 and the cushion cover 14 are manufactured in the manufacturing
process thereof. This eliminates the need for a manual assembly process for assembling the
microphone and the cover, thereby making it possible to advantageously reduce the
manufacturing cost of the microphone cover composite member 10.
[0037]
Moreover, the gate 42 for injection of the elastomeric material 74 is disposed to be located at the
injection molding die 46 sited off the microphone element 12, and the flow of the elastomeric
material 74 injected through the gate 42 is First, the molding element 62 of the injection
molding die 46 is in contact with the surface facing the gate 42 of the molding cavity 62 so as
not to directly collide with the microphone element 12, and the elastomer material 74 injected
thereafter is the outer periphery of the microphone element 12. The cushion cover 14 is formed
by being filled in the forming cavity 62 in such a manner as to be wound around the portion.
Therefore, the elastomeric material 74 in the plasticized molten state is brought into contact with
the surface of the molding cavity 62 of the injection molding die 46 used for injection molding,
and after the material temperature is appropriately reduced, the microphone element 12 is
produced. The heat of such an elastomeric material 74 effectively prevents the microphone
element 12 from being rapidly heated from the point where it comes into contact with a high
temperature condition such that the heat resistance temperature of the microphone element 12
is exceeded. In addition, since the performance of the microphone element 12 is degraded or
destroyed, it can be advantageously prevented since the suppression or avoidance is
advantageously achieved.
[0038]
The microphone cover composite member 10 having such a structure is used as one component
of an on-vehicle microphone device 76 mounted on an automobile or the like as shown in FIGS.
10 to 13, for example. It becomes.
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[0039]
First, FIG. 10 shows an example of the on-vehicle microphone device 76 in the form of a
perspective explanatory view.
There, the in-vehicle microphone device 76 includes the microphone-cover composite member
10, the retainer case 78, and the housing 80. Further, the retainer case has a longitudinal
rectangular housing shape as a whole, and is made of a resin case body 82 and an elastomer
retainer 84, and is integrally formed by, for example, a two-color molding method or the like. ing.
[0040]
Specifically, as shown in FIGS. 11 and 12, the case body 82 of the retainer case 78 has two side
walls 82a and 82b extending in the longitudinal direction and two side walls facing each other in
the longitudinal direction. The two side wall portions 82c and 82d connecting the portions 82a
and 82b and the bottom wall portion 82e having a substantially semicircular cross section are
integrally formed. A pin-shaped rotary shaft 86 extending in the longitudinal direction of the case
body 82 is integrally formed on each of the side surfaces of the two side wall portions 82c and
82d opposite to each other. Furthermore, a through hole 88 is provided substantially at the
center of the bottom wall 82e.
[0041]
In addition, the retainer 84 generally has a longitudinal rectangular housing shape smaller than
the case main body 82 by one circumference, and similarly to the case main body 82, the two
side wall portions 84a and 84b extending in the longitudinal direction and the other in the
longitudinal direction The two side wall parts 84c and 84d which connect two side wall parts
84a and 84b, and the bottom wall part 84e which exhibits cross-sectional substantially
semicircular shape are integrally provided facing each other. A groove 90 extends in the
direction perpendicular to the longitudinal direction across the two longitudinally extending side
walls 84a and 84b and the bottom wall 84e at the longitudinal middle of the retainer 84. It is
provided. In addition, a through hole 92 is formed in a substantially central portion of the bottom
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wall portion 84e. Here, the through holes 92 and 88 respectively provided in the retainer 84 and
the case main body 82 communicate with each other, whereby the inner space of the retainer
case 78 (retainer 84) corresponds to those through holes 92, It communicates with the outside
through 88.
[0042]
Then, the microphone / cover composite member 10 is fitted in and assembled to the groove
portion 90 of the retainer 84. That is, although the microphone element 12 is attached to the
retainer case 78 via the cushion cover 14, here, the guide portion 16 provided integrally with the
cushion cover 14 is a through hole 92 of the retainer 84. The lead wires 18, 18 provided on the
microphone element 12 are taken out of the retainer case 78.
[0043]
By the way, conventionally, when the lead wire 18 is taken out from the retainer case 78, it is
important to eliminate the gap between the retainer 84 and the lead wire 18 in order to prevent
the intrusion of noise. Therefore, the retainer 84 is provided with a very small diameter through
hole having a diameter equal to or slightly smaller than the wire diameter of the lead wire 18,
and the lead wire 18 is passed through such a through hole. Was a tedious task, could not be
automated, and required manual work. In the illustrated embodiment, the through hole 92 is a
relatively large diameter hole having a diameter equal to or slightly smaller than the diameter of
the guide portion 16, and by inserting the guide portion 16 there, By utilizing the elasticity of the
elastomer, the gap between the outer surface of the guide portion 16 and the inner surface of the
through hole 92 can be advantageously closed, thereby advantageously preventing the entry of
noise (see FIG. 1). 13). Therefore, there is an advantage that the work of taking out the lead wire
18 from the retainer case 78 is easy. Moreover, such a structure can cope with automation of the
process.
[0044]
Then, as described above, the retainer case 78 to which the microphone element 12 is attached is
assembled to the housing 80. Here, the housing 80 generally comprises a long rectangular
housing slightly longer than the retainer case 78, and is longitudinally opposed to the two side
wall portions 80a and 80b extending in the longitudinal direction. The two side wall parts 80c
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and 80d which mutually connect two side wall parts 80a and 80b, and the bottom wall part 80e
are integrally provided. And the notch part 94 is formed in the middle part of the length direction
in the side wall part 80a of one of the two long side wall parts 80a and 80b, and also in the bothsides end of the length direction The plate-like support protrusions 96 that project on the
opposite side to the other side wall 80b are integrally formed one by one. Furthermore, an
insertion hole 98 which penetrates in the thickness direction is formed in the tip side portion of
each of the plate-like support projections 96.
[0045]
In the housing 80, the circuit board 100 is fitted so as to be superimposed on the elastic member
102 provided on the bottom wall 80e. Furthermore, in the housing 80, the cover 104 for
covering the opening thereof, the engaging claws 106, 106 provided thereon, and the engaging
holes 108, 108 provided in the side wall portions 80c, 80d of the housing 80. It is attached by
engaging with the peripheral surface (in FIG. 11 and FIG. 12, only one engaging claw 106 and
one engaging hole 108 are shown).
[0046]
The rotary shaft 86 integrally formed on each of the two side wall portions 82c and 82d of the
case main body 82 in a state where the retainer case 78 is disposed between the two plate-like
support protrusions 96 and 96 of the housing 80, 86 are respectively inserted into insertion
holes 98, 98 provided in the two plate-like support protrusions 96, 96. Thus, the retainer case 78
is rotatably assembled to the housing 80 around the rotation shafts 86 and 86.
[0047]
When the retainer case 78 is assembled to the housing 80, the two lead wires 18, 18 of the
microphone element 12 taken out of the retainer case 78 through the retainer 84 and the
through holes 92, 88 of the case main body 82. Are inserted into the housing 80 through the
notches 94 of the side wall 80a of the housing 80 and soldered to predetermined elements (not
shown) on the circuit board 100.
[0048]
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Thus, an assembly of the retainer case 78 to which the microphone cover composite member 10
is attached and the housing 80 is configured, and the vehicle-mounted microphone device 76 is
formed by this assembly.
Then, such an on-vehicle microphone device 76 is mounted at a predetermined position in the
vehicle interior of the car.
[0049]
As mentioned above, although the typical embodiment of the present invention has been
described in detail, it is merely an example, and the present invention is not limited by the
specific description according to such an embodiment. It should be understood that it is not to be
interpreted.
[0050]
For example, in the illustrated embodiment, the gate marks 40 are left at one corner of the
surface 36 of the cushion cover 14, but such gate marks 40 are formed on the surface 36 of the
cushion cover 14. It can be left on the other corner or left on the back surface 38 of the cushion
cover 14.
In short, the gate 42 for injection of the elastomeric material that forms the cushion cover 14
may be positioned at the injection molding die 46 part off the top of the microphone element 12,
and as a result, the gate mark 40 is It will be left at the position corresponding to such a gate 42
arrangement site.
[0051]
Further, in the illustrated embodiment, a so-called direct gate system in which the tip of the
nozzle 72 of the injection device 48 is in direct contact with the gate 42 is employed, but the
present invention is not limited thereto. It is also possible to adopt it appropriately, and to adopt
a method that requires sprues and runners.
[0052]
Furthermore, even if it is in the form of the cushion cover 14, it is not limited to the illustrated
one, but it may be appropriately selected according to the shape of the retainer case 78 (retainer
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84), the mounting requirements to the vehicle, the size of the microphone element 12, etc. It is
possible to change, for example, the form etc. which exhibit rectangular shape or circular shape
by planar view.
[0053]
Furthermore, the shape of the guide portion 16 is not limited to a cylindrical shape, and any
shape such as triangular prism, square prism, etc. can be adopted.
In the implementation of the present invention, although the guide portion 16 is not necessarily
a necessary configuration, it facilitates the work of taking out the lead wire 18 from the retainer
case 78 and corresponds to the automation of the manufacturing process of the in-vehicle
microphone device 76. It is desirable to provide the guide portion 16 from the viewpoint of
[0054]
In addition, although not listed one by one, the present invention can be implemented in an
embodiment to which various changes, modifications, improvements, etc. are added based on the
knowledge of those skilled in the art, and such an embodiment of such an embodiment It is
needless to say that all are within the scope of the present invention, without departing from the
spirit of the present invention.
[0055]
DESCRIPTION OF SYMBOLS 10 microphone cover composite member 12 microphone element
14 cushion cover 16 guide part 18 lead wire 24 vibrator 40 gate mark 42 gate 46 injection
molding type 48 injection device 50 upper mold 52 lower mold 54, 58 microphone element
holding convex part 56, 60 Cushion cover forming recess 62 Molded cavity 68 Degassing space
70 Degassing passage 72 Nozzle 74 Elastomer material 76 Automotive microphone device 78
Retainer case 80 Housing 82 Case body 84 Retainer 88, 92 Through hole
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