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JP2018131115

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DESCRIPTION JP2018131115
Abstract: [Problem] To provide an on-vehicle microphone device which can ensure safety and
prevent deterioration of microphone characteristics without turning a driver's line of sight. A
vehicle-mounted microphone device in which a microphone (1) is mounted on a microphone
cover (10), a sound-permeable layer (12) is provided on an interior surface (11a) of a
microphone cover housing (11). Further, the through hole 13 is disposed so as to surround the
microphone sound hole 7 of the microphone 1. When the microphone 1 is attached to the
microphone cover 10, the sound leakage preventing projection 5S is further disposed so as to
surround the through hole 13 of the microphone cover 10, and the sound leakage preventing
projection 5S is elastically deformed. The space between the microphone cover 10 is sealed.
[Selected figure] Figure 1
In-vehicle microphone device
[0001]
BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to an invehicle microphone device assembled inside a vehicle.
[0002]
2. Description of the Related Art An on-vehicle microphone mounted on the inside of a vehicle,
for example, an overhead module, a car navigation device, etc., is widely known.
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The sound collected by the in-vehicle microphone is used for the operation of an in-vehicle
device (for example, a car navigation device or a mobile phone).
[0003]
Also, in recent years, in order to prevent an accident that occurs due to the use of a mobile phone
while driving a vehicle, a device in which a driver can talk without having a mobile phone, socalled hands-free device has become widespread.
[0004]
The hands-free device generally comprises an on-board microphone which picks up the sound
inside the vehicle, which is installed at an appropriate location inside the vehicle.
However, if this in-vehicle microphone is exposed inside the vehicle, the appearance of the inside
of the vehicle is significantly impaired. For example, in-vehicle microphones usually have
overhead modules, vehicle ceilings, instrumental panels, etc. It is generally incorporated into a
car navigation system or the like together with a panel, a cover or the like.
[0005]
For example, in Patent Document 1, an in-vehicle microphone is used by being incorporated into
an input surface panel of a car navigation device, and a through hole for transmitting sound to
the in-vehicle microphone is opened in the input surface panel of the car navigation device.
[0006]
Further, in Patent Document 2, the in-vehicle microphone is disposed at an appropriate position
of the overhead module, and the through-hole for transmitting the sound to the in-vehicle
microphone is not in contact with the sound collecting surface of the microphone in the overhead
module. It is opened at a position away from the.
Moreover, the sound-permeable layer which covers a through-hole is provided in the interior
surface of an overhead module.
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2
[0007]
JP, 2012-121117, A JP, 2004-173190, A
[0008]
However, as in Patent Document 1, when a through hole for transmitting a sound to a carmounted microphone is opened in a panel or cover such as a car navigation device, an overhead
module, a vehicle ceiling, an instrumental panel, etc. However, because the driver sees from the
inside of the vehicle, the driver is distracted from the front to talk to those through holes, which
increases the danger during driving.
[0009]
Further, in Patent Document 2, the through hole for transmitting the sound to the in-vehicle
microphone is not in contact with the sound collecting surface of the microphone, but is opened
at a position separated from the sound collecting surface, that is, the through hole is a
microphone sound hole. A sound-permeable layer is provided on the interior surface so as not to
be open at a position surrounding the wall, and to cover the through hole.
Therefore, there is a problem that the phase shift occurs due to the mutual influence of the
acoustic resistance component by the sound-permeable layer such as cloth and the microphone
sound hole or the through hole of the microphone cover case, thereby deteriorating the
microphone characteristics.
[0010]
The present invention has been made to solve the above-mentioned problems.
An object of the present invention is to provide an on-vehicle microphone device that can ensure
safety without disturbing a driver's line of sight and can suppress deterioration of microphone
characteristics.
[0011]
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The present invention is an on-vehicle microphone device assembled inside a vehicle, comprising:
a microphone; and a microphone cover on which the microphone can be mounted and for fixing
the microphone to the vehicle, the microphone being a housing -One or more microphone
elements stored in the housing and converting sound into electric signals; and a floater having a
microphone sound hole for guiding the sound generated in the passenger compartment to the
microphone elements. The microphone cover includes: a microphone cover housing in which a
through hole for guiding a voice generated in the passenger compartment to the microphone is
formed on an interior surface facing the passenger compartment when attached to a vehicle; A
sound-permeable layer which is laminated and conceals the through hole, and the through hole
receives the microphone sound hole. The floater is disposed so as to further surround the
through hole, and is elastically deformed when the microphone is mounted on the microphone
cover, so that the microphone and the microphone cover are opened. A sound leakage preventing
projection for sealing the space is provided.
[0012]
According to the present invention, the sound-permeable layer for concealing the through hole is
stacked on the interior surface of the microphone cover case, so that the driver can not confirm
the position of the through hole in the microphone cover case. I can not recognize if the voice is
picked up.
Therefore, using this on-vehicle microphone device, it is possible to prevent the driver from
deviating from the front.
[0013]
In addition, the through hole in the microphone cover case is opened at a position surrounding
the microphone sound hole of the in-vehicle microphone, so that the acoustic resistance
component by the sound transmitting layer such as cloth and the through hole of the
microphone sound hole or the microphone cover case It is possible to eliminate the phase shift
due to mutual influence with each other and to suppress the deterioration of the microphone
characteristics.
[0014]
Therefore, it is possible to further secure the microphone characteristics of the in-vehicle
microphone device after securing safety without diverting the driver's line of sight.
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[0015]
According to the present invention, it is possible to realize an on-vehicle microphone device that
can ensure safety and prevent deterioration of microphone characteristics without diverting the
driver's line of sight.
[0016]
FIG. 1 is a cross-sectional view showing the configuration of an in-vehicle microphone device
according to a first embodiment.
FIG. 1 is a top view showing the configuration of an in-vehicle microphone device according to a
first embodiment.
Explanatory drawing which shows the structure of the protrusion for sound leakage prevention
in the vehicle-mounted microphone apparatus which concerns on 1st Embodiment.
Explanatory drawing which shows the structure of the protrusion for sound leakage prevention
in the vehicle-mounted microphone apparatus which concerns on 2nd Embodiment. The graph
which shows the result of the frequency characteristic in the in-vehicle microphone device
concerning a 1st embodiment. The graph which shows the result of the frequency characteristic
in the conventional vehicle-mounted microphone apparatus.
[0017]
Hereinafter, embodiments of the present invention will be described in detail with reference to
the drawings. In the following description, preferred embodiments of the materials and the like
used in the present invention are merely exemplified, and the present invention is not limited to
these embodiments. Moreover, changes can be made as appropriate without departing from the
scope of the technical concept of the present invention. Furthermore, it is also possible to
combine each embodiment suitably.
[0018]
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First Embodiment FIG. 1 is a longitudinal sectional view of an in-vehicle microphone device
according to a first embodiment. FIG. 2 is a top view of the in-vehicle microphone device
according to the first embodiment. FIG. 3 is an explanatory view showing a structure of the
sound leakage preventing projection in the in-vehicle microphone device according to the first
embodiment.
[0019]
As shown in FIG. 1 and FIG. 2, the in-vehicle microphone device is an in-vehicle microphone
device assembled inside the vehicle, and the microphone 1 and the microphone 1 can be
attached. A microphone cover for fixing the microphone 1 to the vehicle It has 10 and.
[0020]
Among these, the microphone 1 converts the collected voice into a voice signal, and transmits the
voice signal to a voice signal input device such as a mobile phone or a car navigation device.
As shown in FIGS. 1 and 2, the microphone 1 includes a housing 6, one or more microphone
elements 8 stored in the housing 6 for converting sound into electrical signals, and sound
generated in the passenger compartment. And a floater 5 in which a microphone sound hole 7
for leading to the microphone element 8 is formed.
[0021]
In the illustrated example, the housing 6 includes a housing combined connector 6a and a panel
6b fitted to the housing combined connector 6a.
[0022]
The connector pin 2 is integrally formed in the housing combined connector 6a.
Also, the microphone element 8 is mounted on the substrate 4 together with the circuit-forming
mounting component 3, and the substrate 4 is connected to the connector pin 2 by soldering.
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[0023]
The floater 5 is disposed on the back side of the substrate 4 on which the microphone element 8
is mounted. By fitting the housing connector 6a and the panel 6b together, the floater 5, the
microphone element 8 and the circuit board 4 on which the circuit forming mounting component
3 is mounted are located in the housing connector 6a and the panel 6b. Contained in
[0024]
In the present embodiment, the floater 5 has the microphone sound hole 7 and is made of a soft
material. When the housing connector 6a and the panel 6b are fitted, the floater 5 having the
microphone sound hole 7 is incorporated in the panel 6b, and the microphone sound hole 7 is
opened so as to be exposed from the panel 6b. ing.
[0025]
As shown in FIGS. 1 and 2, in the interior surface 11a facing the passenger compartment when
the microphone cover 10 is attached to the vehicle, a through hole 13 for guiding the voice
generated in the passenger compartment to the microphone 1 is formed. The microphone cover
housing 11 has a sound-permeable layer 12 laminated on the interior surface 11 a of the
microphone cover housing 11 and concealing the through holes 13.
[0026]
The microphone cover 10 is for fixing the microphone 1 to a vehicle, and, for example, the
interior surface according to any one of the group consisting of an overhead module, a ceiling, a
room mirror, an instrumental panel, a pillar garnish, a steering wheel, and navigation. It has 11a.
[0027]
In the present embodiment, the sound-permeable layer 12 is formed of a sound-permeable sheetlike material, and is affixed to the interior surface 11 a facing the interior of the vehicle with an
adhesive, an adhesive tape, or the like.
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The sound-permeable layer 12 may be laminated on the entire interior surface 11 a.
In this case, it is possible to further obscure the position where the through hole for sound
transmission is opened, and it is possible to more effectively prevent the driver from deviating
from the front.
[0028]
As shown to FIG. 1 and FIG. 2, the microphone 1 is mounted in the back surface side of the
interior surface 11a in which the sound-permeable layer 12 was formed. A through hole 13 for
introducing sound to the microphone 1 is opened to surround the microphone sound hole 7 of
the microphone 1.
[0029]
The through holes 13 are concealed by the sheet-like sound-permeable layer 12.
[0030]
As shown in FIGS. 1 and 2, in the present embodiment, the floater 5 has a sound leakage
preventing projection 5S that protrudes so as to surround the microphone sound hole 7.
The sound leakage preventing projection 5S is preferably disposed between the outermost shape
of the microphone 1 and the through hole 13 of the microphone cover housing 11.
[0031]
As shown in FIG. 3, when the microphone 1 is attached to the microphone cover 10, the sound
leakage preventing projection 5 </ b> S is formed of a soft material and thus pressed against the
microphone cover housing 11. By deforming, the gap between the microphone 1 and the contact
surface of the microphone cover case 11 can be closed.
[0032]
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As a result, when the in-vehicle microphone device is attached to a vehicle or an interior part, the
structure for sealing the area other than the microphone sound hole 7 is achieved by the sound
leakage preventing projection 5S, and only the sound to be collected from the interior surface
11a is collected. can do.
[0033]
(Example) FIG. 5A and FIG. 5B show the result of the sound collection experiment by the present
inventors, and FIG. 5A is a graph showing the result of the frequency characteristic in the onvehicle microphone device according to the present embodiment. FIG. 5B is a graph showing the
result of frequency characteristics in the conventional on-vehicle microphone device.
Here, as the conventional on-vehicle microphone device , as in Patent Document 2, the
through hole for transmitting sound to the on-vehicle microphone is not opened at a position
surrounding the microphone sound hole, and the through hole is covered A sound-permeable
layer was used on the interior surface.
[0034]
In FIGS. 5A and 5B, three curves respectively indicate sensitivity curves in the 0 ° direction, 90
° direction, and 180 ° direction.
The curve towards 0 ° is shown by a solid line, the curve towards 90 ° is shown by a dashed
line, and the curve towards 180 ° is shown by a dash-dotted line.
[0035]
From the graph shown in FIG. 5A, in the on-vehicle microphone device according to the present
embodiment, in the frequency band of 200 to 500 Hz, the curve in the direction of 90 ° has a
sensitivity difference of about 5 dB with respect to the curves in the direction of 0 ° and 180 °.
It can be seen that the frequency characteristics as designed are obtained without mutual effects
of the microphone sound hole 7, the through hole 13 of the microphone cover housing 11, and
the sound-permeable layer 12.
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[0036]
On the other hand, according to the graph shown in FIG. 5B, in the conventional on-vehicle
microphone device, the sensitivity difference of the curve in the direction of 90 ° becomes
smaller than the curve in the direction of 0 ° and 180 ° in the frequency band of 200 to 500
Hz. The mutual influence of the hole 7, the through hole 13 of the microphone cover housing 11,
and the sound-permeable layer 12 is observed, and it can be seen that the frequency
characteristics as designed can not be obtained.
[0037]
As described above, according to the present embodiment, the sound-permeable layer 12 for
concealing the through hole 13 is stacked on the interior surface 11 a of the microphone cover
housing 11, so that the driver passes through the microphone cover housing 11. The position of
the hole 13 can not be confirmed, and it can not be recognized where the voice is picked up.
Therefore, using this on-vehicle microphone device, it is possible to prevent the driver from
deviating from the front.
[0038]
Further, the through hole 13 in the microphone cover housing 11 is opened at a position
surrounding the microphone sound hole 7 of the microphone 1 so that the acoustic resistance
component by the sound transmission layer 12 such as cloth and the microphone sound hole 7
or the microphone cover The phase shift due to the mutual influence with the through hole 13 of
the housing 11 can be eliminated, and the deterioration of the microphone characteristics can be
suppressed.
[0039]
Therefore, according to the present embodiment, it is possible to secure the microphone
characteristics of the in-vehicle microphone device while securing the safety without diverting
the driver's line of sight.
Second Embodiment FIG. 4 is an explanatory view showing a structure of a sound leakage
preventing projection in a vehicle-mounted microphone device according to a second
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embodiment.
In the second embodiment, with respect to parts that can be configured in the same manner as in
the first embodiment described above, the same reference numerals as those used for the
corresponding parts in the first embodiment are used, and overlapping descriptions Omit.
[0040]
In the first embodiment described above, the sound leakage preventing projection 5S is provided
on the floater 5 of the microphone 1. However, as shown in FIG. Similarly, the sound leakage
preventing projection 5S may be provided (second embodiment). In the second embodiment, the
floater 5 of the microphone 1 is not provided with the sound leakage preventing projection 5S,
and the microphone cover housing 11 is provided with the sound leakage preventing projection
5S as described above. The second embodiment is the same as the first embodiment.
[0041]
The second embodiment as described above also provides the same effects as the first
embodiment.
[0042]
The floater 5 is not particularly limited as long as it is a soft material.
In the first and second embodiments described above, an ethylene-propylene rubber or the like is
used as the soft material constituting the floater 5. Ethylene-propylene rubber is of two types:
EPM (EPR), which is a copolymer of ethylene and propylene, and EPDM (EPT), a terpolymer,
which further contains a small amount of a third component. Generally, EPM is used for
industrial rubber products due to peroxide cross-linking material etc. However, it acts as an
impact modifier by adding it to general-purpose resin such as polypropylene at present, impact
resistance A highly flexible floater material can be obtained. On the other hand, since the specific
gravity is small, it is effective for weight reduction.
[0043]
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Further, in the first and second embodiments described above, a substrate mount type
microphone element is shown as the microphone element 8, but the condition that the seal
between the floater 5 and the microphone element 8 is maintained In the case of the lower side,
microphone elements 8 other than the board mount type are also possible.
[0044]
As described above, according to the present invention, it is possible to realize an on-vehicle
microphone device that can ensure safety and prevent deterioration of microphone
characteristics without turning off the driver's line of sight.
[0045]
DESCRIPTION OF SYMBOLS 1 microphone 2 connector pin 3 mounting component for circuit
formation 4 substrate 5 floater 5 S sound leakage preventing protrusion 6 housing 6 a housing
combination connector 6 b panel 7 microphone sound hole 8 microphone element 10
microphone cover 11 microphone cover housing 11 a interior surface 12 Sound-permeable layer
13 through holes
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