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JPH0698387

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Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JPH0698387
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
microphone for detecting an interior noise in a vehicle such as a car, and more particularly to a
layout structure of a microphone for detecting an interior noise which can be attached to a
narrow place in the interior.
[0002]
2. Description of the Related Art In recent years, in order to reduce noise, that is, so-called
"boggling noise" caused by rotational vibration of an engine in a vehicle compartment of a car, a
speaker provided in the vehicle compartment generates additional noise of a phase opposite to
noise. Also, a so-called electronic muffling system has been proposed that causes the vehicle
interior to acoustically interfere with each other. Such an electronic muffling system requires a
plurality of microphones for detecting noise in the passenger compartment in order to form an
additional sound for acoustically interfering and reducing noise.
[0003]
By the way, the structure of a conventional microphone is generally a structure in which a
microphone unit is held by an elastic member inside a cylindrical frame as described in, for
example, Japanese Utility Model Publication No. 59-9496. Is a structure suitable for, for example,
a tape recorder, a cine camera having a simultaneous recording mechanism, and the like.
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[0004]
Although the above-mentioned prior art microphone structure is a suitable structure for a tape
recorder and a cine camera having a simultaneous recording mechanism, however, a plurality of
the microphones are mounted in the interior of a car and the interior It can not be said that it is
necessarily a suitable structure as a microphone for an electronic muffling system that detects
noise.
That is, in the above-mentioned prior art tape recorders and microphones for cine cameras
provided with a simultaneous recording mechanism, there is no particular restriction on the
arrangement space, and there is no need to worry about the arrangement structure of the
microphone unit, and the structure is also car It was not suitable for installation in a narrow
space in a room.
[0005]
In particular, in the electronic muffling system, a plurality of microphones are mounted in the
cabin of the car, for example between the roof and the head lining, in which case the microphone
structure is thin to reduce the amount of protrusion into the cabin. Must. In the above-described
conventional microphone, no consideration is given to this point, and there has been a problem
that the microphone unit can not be disposed when it becomes thin.
[0006]
Therefore, the present invention has an object to provide a structure suitable as a microphone for
detecting vehicle interior noise used in an electronic muffling system, in particular, a thin
microphone structure that can be attached between the roof and head lining of a car. I assume.
[0007]
In addition, since the microphone for detecting the noise in the passenger compartment is
attached on the head lining in the passenger compartment with a mounting clip, the microphone
unit may be broken by erroneously inserting a rod or the like from the noise intake hole formed.
In some cases, another object of the present invention is to provide a structure capable of safely
arranging the microphone unit in the frame of the microphone in consideration of such a case.
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[0008]
[Means for Solving the Problems] In order to achieve the above-mentioned object, as a structure
of a microphone for detecting a vehicle interior noise proposed by the present invention, as is
apparent from the claims, it has a flat outer shape. A structure has been proposed in which the
microphone unit is disposed sideways with respect to the noise capturing hole formed in the
plane of the microphone frame, and the output terminal of the microphone unit is also taken out
laterally.
[0009]
Further, according to the present invention, the microphone unit disposed laterally in the frame
of the microphone is further held inside the elastic holder in which the noise taking-in groove is
formed, and the microphone unit is the noise taking-in groove. It is arranged to face the side wall.
[0010]
In other words, according to the above-described structure of the interior noise detection
microphone according to the present invention, the microphone unit is disposed sideways with
respect to the noise intake hole formed on the plane of the microphone frame, Furthermore,
since the output terminal of the microphone unit is also taken out laterally, the height of the
frame can be suppressed and it can be disposed in a flat thin frame.
[0011]
Also, the microphone unit is held inside the elastic holder in which the noise intake groove is
formed, and disposed in the holder so as to face the side wall of the noise intake groove, and this
is taken as the noise intake hole of the frame. The microphone unit is less likely to be broken
even if a rod or the like is inserted from the noise intake hole, and the microphone unit is safely
and securely disposed in the thin frame.
[0012]
Embodiments of the present invention will be described in detail below with reference to the
accompanying drawings.
FIG. 1 shows a microphone for detecting a vehicle interior noise according to an embodiment of
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the present invention, which is an electronic muffling for reducing noise and "bomber" caused by
rotational vibration of an engine in the vehicle interior. The system is used as a noise detection
device for detecting noise in a vehicle compartment.
[0013]
As shown in FIG. 1, the in-vehicle noise detection microphone has a flat rectangular outer shape
as shown in FIG.
That is, the frame 1 constituting the in-vehicle noise detection microphone is assembled by
uniting the flat upper frame 1-a and the flat lower frame 1-b, thereby exhibiting a flat rectangular
solid outer shape There is.
A noise taking-in hole 2 for taking in noise is formed in a projecting manner on a flat surface of
the frame 1, specifically, on the lower surface of the lower frame 1-b.
In the frame 1, a microphone unit 3 (shown by a broken line in the figure), a holder 4 formed of
an elastic body such as rubber, and parts related to the microphone, for example, an input signal
from the microphone A substrate 5 on which a circuit for amplifying the signal is mounted is
accommodated, and a connector 6 for sending the amplified output from the amplifier circuit
substrate 5 to the outside is attached to the rear end of the frame 1.
[0014]
FIG. 2 shows a cross section of the above-mentioned in-room noise detection microphone, and as
is apparent from the figure, the elastic body holder 4 is formed so as to surround the microphone
unit 3.
A square pole-shaped noise taking-in groove 4-a is formed in the central portion of the holder 4,
and the microphone unit 3 is disposed sideways so as to face the wall surface of the noise takingin groove 4-a. It is done.
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That is, as apparent from the figure, the axis of the noise intake hole 2 formed in the abovementioned frame 1 and the axis of the noise intake groove 4-a of the elastic holder are in the
same direction (that is, The microphone unit 3 is mounted so that its axis is perpendicular to the
axes of the noise intake hole 2 and the noise intake groove 4-a. .
[0015]
Moreover, in this figure, the code | symbol 10 is a roof of a motor vehicle, and the code | symbol
11 has shown the head lining. The reference numeral 9 designates a screw for assembling and
connecting the upper frame 1-a and the lower frame 1-b, the reference numeral 11-a designates
a microphone mounting hole formed in the lining head 11, and the reference numeral 12
designates a mounting. Shows the clip. The assembling method will be specifically described. The
noise taking-in hole 2 is formed in the microphone mounting hole 11a of the lining head 11
before being assembled inside the vehicle body, projecting from the lower surface of the frame of
the in-vehicle noise detection microphone. , And attach the mounting clip 12 from the opposite
side of the lining head 11. In this manner, the lining head 11 having the plurality of in-room
noise detection microphones attached at a predetermined location is attached to the in-vehicle
room, and as shown in the figure, the in-vehicle noise detection microphones have the roof 10
and the lining head 11. Will be housed in the gap between
[0016]
Here, a more detailed structure of the elastic holder 4 of the microphone unit 3 will be described
with reference to FIG. The elastic holder 4 has a cylindrical main body 4-b (in particular, see (c)
in FIG. 3) for housing the microphone unit 3 inside, and extends to the left and right for fixing
these in the frame 1 It is comprised by the overhang parts 4-c and 4-c (especially refer to (b) of
FIG. 3). Then, the above-mentioned noise intake groove 4-a is formed in the cylindrical main body
4-b (in particular, refer to (c) in FIG. 3), and the main body 4-b is a groove The microphone unit 3
is disposed sideways with respect to 4-a and is covered so as to wrap around the periphery (see
particularly (a) of FIG. 3). In these holders 4, that is, the noise taking-in groove 4-a, the main body
part 4-b, and the overhang part 4-c are integrally formed of a viscoelastic member.
[0017]
Further, as shown in FIG. 2, the above-mentioned elastic holder 4 has projections 7 provided on
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the inner surface of the upper frame 1-a in the holes 4-d and 4-d of the overhang portion 4-c.
The visco-elastic member is compressed and securely fixed by inserting the eight and further
combining the upper frame 1-a and the lower frame 1-b. As described above, the upper frame 1-a
and the lower frame 1-b are fixed by the screw 9. The microphone having the above-described
configuration can be attached, for example, by the attachment clip 12 while a part of the intake
hole 2 is facing the vehicle interior between the roof 10 and the head lining 11 of the
automobile. Is the same as
[0018]
4 to 6, the operation of the microphone configuration for detecting the interior noise of a vehicle
according to the present invention in which the microphone unit 3 is disposed sideways will be
described. In FIG. 4A, the microphone unit 3 is disposed laterally to the noise intake hole 2 and
the noise intake groove 4-a, and further, the side of the noise intake groove 4-a. Because it is
disposed facing the wall surface, even if a rod etc. is inserted directly from the noise intake hole
2, there is little direct contact with the microphone unit 3 as in the conventional structure of (b),
and a structure that is not easily damaged It has become.
[0019]
Further, in the structure of the present invention shown in FIG. 5A, since the space (in particular,
the height b of the frame 1) can be considered only by the width a of the microphone unit 3,
saving of the arrangement structure of the microphone unit In order to make the space smaller
and to make the frame thinner, it is possible to mount the passenger compartment without giving
a sense of incongruity to the passenger compartment without having the protrusion amount in
the passenger compartment. On the other hand, in the conventional structure of FIG. 5B, since it
is necessary to consider the output terminal of the microphone unit 3, not only the width a of the
microphone unit 3 but also the height α of the output terminal Also, the height of the frame 1
becomes b + α and the height becomes high.
[0020]
Further, as is clear from FIG. 6A, when the microphone unit 3 is disposed in the lateral direction,
the microphone unit 3 is inserted regardless of how the mounting clip 12 is inserted into the
noise intake hole 2. Since there is no fear of breakage, the shape of the mounting clip 12 can be
simplified as compared with the conventional structure (b), and consequently, the mounting
property of the clip 12 can be improved.
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[0021]
The arrangement structure of the microphone unit of the present invention is arranged laterally
to the noise intake hole formed in the frame, and is further arranged on the side surface.
And a visco-elastic member was used as a member which supports this microphone unit in a
frame. With such a lateral structure of the microphone unit, even if a rod or the like is mistakenly
inserted from the noise intake hole, direct contact with the microphone unit is less, and the
possibility of breakage is reduced. In addition, by turning the microphone unit sideways, the
thickness dimension of the frame is determined only by the width dimension of the microphone
unit, and in particular, non-uniformity such as variation or variation in dimension due to variation
in the output terminal of the microphone unit Because it does not have a thin flat frame is surely
possible. Furthermore, since the microphone unit can not be seen directly from the noise intake
hole, the shape of the inset portion of the in-vehicle mounting clip can be easily determined, and
the shape in which the clip can be easily attached is possible.
[0022]
According to the present invention, by arranging the microphone unit laterally and on the side of
the noise intake hole, the possibility of breakage due to direct contact with the microphone unit
is reduced, and Since the space saving of the arrangement structure and the thin and flat
microphone can be achieved as a result, a practically excellent effect of being able to be mounted
without discomfort even in a small space in a vehicle interior is exhibited. Furthermore, since the
shape of the clip for mounting in the vehicle compartment can be simplified, there is a sufficient
effect to improve the mountability.
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