JPH1098790

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DESCRIPTION JPH1098790
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
microphone structure, and more particularly to a mounting structure of a microphone housed in
a housing.
[0002]
2. Description of the Related Art In an apparatus equipped with a microphone for telephone calls
and recording, the conventional mounting structure of the microphone on the housing is, as
shown in FIGS. 5 (a) and 5 (b), an example of the inside of the housing 51. The microphone
holder 55 is provided in the microphone housing portion 52 provided at the center, and the
circular microphone 56 is housed with the center of the circular microphone 56 provided at the
front and back of the housing 51. It is common to match the
[0003]
As described above, conventionally, the center of the microphone 56 coincides with the center O
of the sound collection holes 53, 53 provided on the front and back of the housing 51. In the
vicinity of the center between the terminal (positive electrode terminal) 57 and the ground
electrode terminal (negative electrode terminal) 58, static electricity from the outside is easily
applied through the sound collection hole 53, whereby, for example, a signal There is a problem
that the side electrode terminal 57 and the ground side electrode terminal 58 are short-circuited
and the circuit of the microphone 56 is likely to be adversely affected.
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[0004]
SUMMARY OF THE INVENTION It is an object of the present invention to prevent, in a
microphone structure housed in a housing, the influence of static electricity from the outside
which intrudes from a sound collection hole of the housing on a circuit.
[0005]
SUMMARY OF THE INVENTION In order to solve the above problems, the invention according to
claim 1 is a microphone structure comprising a case having a sound collection hole and a
microphone housed inside the case. The present invention is characterized in that the centers of
the signal side electrode terminal and the ground side electrode terminal of the microphone are
disposed offset from the center of the sound collection hole.
Here, the present invention is applied to all devices provided with microphones for speech and
recording.
[0006]
As described above, since the center of the signal-side electrode terminal of the microphone and
the center of the ground-side electrode terminal are offset from the center of the sound collection
hole of the housing, external static electricity enters the inside of the housing from the sound
collection hole. External static electricity is less likely to be discharged to the signal-side
electrode terminal arranged with the center between the center of the sound collection hole and
the ground-side electrode terminal being offset.
Therefore, the influence of external static electricity on the microphone circuit can be prevented.
[0007]
Furthermore, the invention according to claim 2 is the microphone structure according to claim
1, characterized in that the ground side electrode terminal is positioned substantially on the
center line of the sound collection hole.
[0008]
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As described above, since the ground-side electrode terminal according to claim 1 has a
microphone structure located substantially on the center line of the sound collection hole, when
external static electricity intrudes from the sound collection hole into the inside of the housing,
The static electricity from the outside is discharged to the earth side electrode terminal located
approximately on the center line.
Therefore, the influence of external static electricity on the microphone circuit can be effectively
prevented.
[0009]
The invention according to claim 3 is characterized in that the area of the ground-side electrode
terminal is larger than the area of the sound collection hole.
[0010]
As described above, since the area of the ground-side electrode terminal according to claim 1 is
larger than the area of the sound collection hole, the ground-side electrode terminal in which the
static electricity entering from the sound collection hole is larger than the area of the sound
collection hole To be more easily discharged.
[0011]
And the invention according to claim 4 is the microphone structure according to claim 1,
characterized in that an air chamber is provided between the sound collection hole and the
microphone, for example, by a member or the like of another part. There is.
[0012]
Thus, since the air chamber is provided between the microphone according to claim 1 and the
sound collection hole, for example, the microphone is offset to a position away from the sound
collection hole so as not to be affected by static electricity intruding from the outside. While
arranged, the sound collection characteristics of the microphone can be maintained by the air
chamber formed by the members connected between the sound collection holes.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a microphone structure
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according to the present invention will be described below with reference to FIGS. 1 to 4. FIG.
[0014]
<First Embodiment> First, FIG. 1 is a plan view showing a microphone mounting portion on a
housing as a first embodiment of the present invention, and FIG. 2 is a microphone mounting
portion thereof. FIG. 2 (a) is a cross-sectional view taken along the line AA of FIG. 1 and FIG. 2 (b)
is a cross-sectional view taken along the arrow BB of FIG.
3 (a) is a plan view of the microphone portion, FIG. 3 (b) is a side view thereof, and FIG. 3 (c) is a
view of FIG. 3 (c). It is sectional drawing along the arrow DD line ¦ wire of a).
[0015]
In FIGS. 1 to 3, 11 is a housing, 12 is a microphone housing portion, 13 is a sound collecting
hole, 21 is a microphone, 22 is a microphone holder, 23 is a flexible printed circuit (FPC), 24 is a
terminal portion, 25 Is a signal side electrode terminal (positive side electrode terminal), 26 is a
ground side electrode terminal (minus side electrode terminal), O1 is a sound collection hole
center line, and O2 is a microphone center line.
That is, in this embodiment, as shown in the figure, the housing 11 is formed with the
microphone accommodating portion 12 inside thereof, and the sound collecting holes 13 and 13
on the same center line are formed on the front and back surfaces. The center line of the sound
collection hole 13 is indicated by O1 in FIG. 2 (a).
[0016]
Then, in the microphone housing portion 12 inside the housing 11, the circular microphone 21 is
exposed so that the front and back surfaces face the sound collection holes 13 and 13 and wraps
the periphery, and the front surface of the housing 11 The center line of the microphone 21 is
indicated by O2 in FIG. 2A, which is incorporated via the microphone holder 22 sandwiched
between the back surfaces.
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Here, as shown in FIG. 2A, the center line O1 of the sound collection hole 13 and the center line
O2 of the microphone 21 do not coincide with each other and are separated.
Furthermore, as shown in FIGS. 3A to 3C, for example, a flexible printed circuit board (hereinafter
referred to as an FPC) having a connection sheet in which a copper foil is wired on a polyimide
sheet is provided on the surface of the circular microphone 21. 23) bifurcated terminal portions
24 and 24 are connected by soldering.
[0017]
One of the bifurcated terminal portions 24 and 24 is a signal side electrode terminal (positive
side electrode terminal) 25 and the other is a ground side electrode terminal (negative side
electrode terminal) 26. As shown to FIG. 1 and FIG. 2 (a), it is made to correspond on the center
line O1 of the sound collection hole 13, and is arrange ¦ positioned.
The earth-side electrode terminals 26 arranged to coincide with the center line O1 of the sound
collection hole 13 in this manner make the area of the copper foils larger, and are indicated by
hatching ranges in FIG. As shown in a), the diameter and the area of the sound collection hole 13
are sufficiently larger, and the area of the other signal side electrode terminal 25 is larger than
the area of the other signal side electrode terminal 25 as shown by the hatched range in FIG. It
has become.
[0018]
As described above, since the ground side electrode terminal 26 is aligned on the center line O1
of the sound collection hole 13 and the ground side electrode terminal 26 is sufficiently larger
than the area of the sound collection hole 13, 2 (a) and (b) as shown by the arrow C, when static
electricity from the outside penetrates the inside of the housing 11 through the sound collection
hole 13, the static electricity is the center line O1 of the sound collection hole 13 It is discharged
immediately after falling to the ground side electrode terminal 26 which coincides with the top
and is sufficiently larger than the area of the sound collection hole 13.
Therefore, the influence of external static electricity on the microphone circuit can be prevented.
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[0019]
Second Embodiment FIG. 4 shows a second embodiment to which the present invention is
applied, where (a) is a plan view showing a microphone mounting portion on a housing, and (b) is
a second embodiment. It is sectional drawing along the arrow EE line of FIG. 4 (a). In FIGS. 4A
and 4B, 31 is a housing, 33 is a sound collection hole, 41 is a microphone, 42 is a microphone
holder, 44 is a terminal portion, 45 is an extension, 46 is an air chamber, and O3 is a collection.
The sound hole center line, O4 is a microphone center line.
[0020]
That is, in this embodiment, as shown in the drawing, the sound collection holes 33, 33 on the
same center line are formed in the front and back surfaces of the housing 31, and the center line
of the sound collection hole 33 is shown in FIG. b) Medium, indicated by O3. Then, inside the
case 31, the circular microphone 41 is exposed so as to face the sound collection holes 33 and
33 so as to face the sound collection holes 33 and 33, and is surrounded by the front and back
sides of the case 31. The center line of the microphone 41 is shown by O4 in FIG. 4 (b). Here, as
shown in FIG. 4B, the center line O4 of the microphone 41 is farther from the center line O3 of
the sound collection hole 33 than the radius of the microphone 41, and the sound collection hole
center line The distance between O3 and the microphone center line O4 is d.
[0021]
Further, on the surface of the circular microphone 41, a pair of terminal portions 44, 44 are
provided. Then, as shown in FIG. 4B, the microphone holder 42 extends in a lateral direction
from the microphone 41 side and also extends to the periphery of the sound collection holes 33,
33 of the front and back surfaces of the housing 31. 45 are formed. Air chambers 46, 46 are
formed as sound collection paths connecting the sound collection holes 33, 33 to the front and
back of the microphone 41 between the front and back surfaces of the housing 31 by these
extension portions 45, 45. . The air chamber 46 may be formed by a member other than the
microphone holder 42.
[0022]
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As described above, since the microphone structure has the distance between the center line O3
of the sound collection hole 33 and the center line O4 of the microphone 41 offset as a distance
d larger than the radius of the microphone 41, external static electricity is collected from the
sound collection hole 33 Even if it penetrates into the inside of the housing 31, static electricity
from the outside is not applied to the terminal portions 44 and 44 of the microphone 41
disposed far offset with respect to the sound collection hole 33. Therefore, the influence of
external static electricity on the microphone circuit can be prevented. In addition, since the
microphones 41 and the sound collection holes 33 and 33 which are disposed far from each
other are connected by the respective air chambers 46 and 46 in order to prevent such static
electricity, the sound collection characteristics as the microphone 41 can be maintained. It is.
[0023]
In each of the embodiments described above, although the microphone structure is simply
accommodated in the case, the present invention is applied to all devices provided with
microphones for telephone calls and recordings. In addition, it is needless to say that other
specific details and the like can be appropriately changed.
[0024]
As described above, according to the microphone structure of the present invention, the centers
of the signal-side electrode terminal and the ground-side electrode terminal of the microphone
are disposed offset from the center of the sound collection hole of the housing. Therefore, when
external static electricity intrudes into the inside of the housing from the sound collection hole,
the signal side electrode terminal arranged with the center between the center of the sound
collection hole and the ground side electrode terminal shifted from the outside The static
electricity can be made less likely to be discharged. Therefore, the influence of external static
electricity on the microphone circuit can be prevented.
[0025]
Furthermore, according to the microphone structure of the second aspect of the present
invention, since the ground side electrode terminal is located substantially on the center line of
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the sound collection hole, in addition to the effect obtained by the invention of the first aspect,
external static electricity is obtained. When the light enters the inside of the housing from the
sound collection hole, the static electricity from the outside can be discharged to the ground-side
electrode terminal located substantially on the center line of the sound collection hole. Therefore,
the influence of external static electricity on the microphone circuit can be effectively prevented.
[0026]
Further, according to the microphone structure of the third aspect of the present invention, since
the area of the ground side electrode terminal is made larger than the area of the sound
collection hole, in addition to the effects obtained by the invention of the first aspect, the sound
collection hole The advantage is obtained that static electricity entering from the bottom can be
more easily discharged to the ground side electrode terminal.
[0027]
According to the microphone structure of the fourth aspect of the present invention, since the air
chamber is provided between the sound collection hole of the housing and the microphone, in
addition to the effects obtained by the invention of the first aspect, for example, Even though the
microphone is offset to the sound collection hole so as not to be affected by static electricity
intruding from the outside, the sound collection characteristic of the microphone is maintained
by the air chamber formed by the members connected to the sound collection hole. The
advantage of being able to
[0028]
Brief description of the drawings
[0029]
1 is a plan view showing a microphone mounting portion to a housing as a first embodiment
example to which the present invention is applied.
[0030]
2 shows the internal structure of the microphone mounting portion of FIG. 1, (a) is a crosssectional view taken along the line AA of FIG. 1, (b) is a cross section taken along the arrow B-B
of FIG. FIG.
[0031]
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3 shows the electrode structure of the microphone mounting portion of FIG. 1, (a) is a plan view
of the microphone portion, (b) is a side view thereof, (c) is the arrow DD line of FIG. 3 (a) FIG.
[0032]
4 shows a second embodiment of the present invention, (a) is a plan view showing a microphone
mounting portion to the housing, (b) is an arrow E-E of FIG. 4 (a) It is sectional drawing along a
line.
[0033]
5 shows an example of the conventional microphone mounting structure, (a) is a plan view
showing the microphone mounting portion of the housing, (b) is a cross sectional view showing
the internal structure along the arrow FF line It is.
[0034]
Explanation of sign
[0035]
11 housing 13 sound collecting hole 21 microphone 22 microphone holder 23 substrate 24
terminal section 25 signal side electrode terminal 26 earth side electrode terminal 26 sound
collecting hole center line O2 microphone center line 31 housing 33 sound collecting hole 41
microphone 42 microphone holder 44 Terminal 45 Extension 46 Air chamber O3 Sound
collection hole center line O4 Microphone center line
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