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JPH10285259

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DESCRIPTION JPH10285259
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
transmitter provided in a portable telephone or the like, and configured such that a microphone
inside the main body communicates with the outside through a mouthpiece.
[0002]
2. Description of the Related Art In recent years, with the development of wireless
communication technology, portable telephones have become widespread. FIG. 8 shows a
conventional configuration of a transmitter of a mobile phone. The transmitter 1 is configured by
being attached to the back side of the cover 2 which is a component of the case of the mobile
phone in a state where the condenser microphone 3 is held by the microphone holder 4. The
condenser microphone 3 communicates with the outside through a transmission hole 5 formed
in a cylindrical shape in the cover 2.
[0003]
By the way, in the above-described transmitter 1, when natural wind hits the transmission hole
portion 5 in a direction oblique to its depth direction (see arrow A in FIG. 8), the outside side of
the transmission hole portion 5 Since the outer peripheral edge portion 5a which is the open end
of the above has an angular shape, turbulent flow (air flow turbulence) and vortices are
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generated in the vicinity of the outer peripheral edge portion 5a. Then, when the turbulent flow
or vortex enters the inside of the transmission hole portion 5 and hits the sound collecting
surface of the condenser microphone 3 (see arrow B in FIG. 8), the condenser microphone 3
outputs a signal of wide band frequency. At this time, since the broadband frequency signal
becomes noise (wind noise) for the caller, the caller feels discomfort due to the broadband
frequency signal.
[0004]
Therefore, it has been considered to add an internal circuit for removing broadband frequency
signals in order to avoid making the caller feel uncomfortable. It is also conceivable to shift the
positions of the transmission hole portion 5 and the condenser microphone 3 and connect the
transmission hole portion 5 and the condenser microphone 3 by a rubber passage that absorbs a
signal of a wide band frequency. However, in these configurations, since new components such
as internal circuits and rubber are required, there is a problem that the configuration becomes
complicated and the cost becomes high.
[0005]
The present invention has been made in view of the above circumstances, and an object thereof
is to reduce a wide band frequency signal generated by natural wind turbulence and vortices
without increasing cost while having a simple configuration. It is possible to provide a
microphone capable of making it possible for the caller to talk comfortably.
[0006]
According to the invention of claims 1 and 2, the natural wind generates turbulence and vortices
in the vicinity of the outer peripheral edge of the mouthpiece, and the turbulence and vor Most
of the turbulence and vortices that enter the inside of the mouthpiece part will be repelled by the
step part, and will swirl inside the first stage hole part, even if it may enter inside the part.
Become.
Therefore, most of the turbulence and vortices generated by the natural wind do not enter inside
the (deep) second stage hole ahead of the first stage hole and will not hit the microphone. In
addition, since the first turbulent flow or vortex swirls the inside of the first stage hole, natural
wind from later does not easily enter the hole.
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[0007]
As a result, it is possible to reduce broadband frequency signals (noise for the caller) generated
by natural wind turbulence and vortices, and the caller can talk comfortably. Further, in this case,
there is no need to separately provide an internal circuit for removing broadband frequency
signals and a component such as rubber for absorbing broadband frequency signals, so that the
configuration can be simplified and the cost becomes high. There is nothing to do.
[0008]
According to the invention of claims 3 and 4, most of the natural wind smoothly enters the inside
of the transmission hole along the outer peripheral edge of the transmission hole, so that
turbulent flow and vortices occur. It becomes difficult to do so, and it becomes possible to reduce
the signal of wide band frequency more.
[0009]
According to the inventions of claims 5 and 6, even if the vortices staying inside the first stage
hole portion may enter into the second stage hole portion, most of the vortices are Since it
smoothly enters the inside of the second stage hole along the outer peripheral edge of the step,
new turbulence and vortices are less likely to be generated, and the broadband frequency signal
can be further reduced. It will be.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION An embodiment in which the present
invention is applied to a transmitter of a portable telephone will be described below with
reference to FIGS. 1 to 3. FIG.
First, in FIG. 2, the start key 12a, the redial key 12b, the end key 12c, and the numeral keys 12d
of "0" to "9" (in FIG. ), * (Asterisk) key 12e, # (sharp) key 12f, call / memory key 12g, function
key 12h, power key 12i, clear key 12j, up scroll key 12k and down scroll key 12l A display 13
for displaying keys, numbers, characters and the like, a transmitter (microphone) 14 and a
receiver (receiver) 15 are provided.
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[0011]
Now, the transmitter 14 will be described in detail with reference to FIG.
The transmitter 14 is attached to the back of the cover 16 (main body in the present invention)
which is a component of the case of the portable telephone 11 in a state where the condenser
microphone 17 (microphone in the present invention) is held by the microphone holder 18 Is
configured. The condenser microphone 17 communicates with the outside through the hole 18 a
of the microphone holder 18 and the transmission hole 19 formed in the cover 16.
[0012]
In the transmission hole portion 19, a first-step staircase in which the first-stage hole portion 20
located outside and the second-stage hole portion 21 located on the condenser microphone 17
side are connected via the step portion 22. It is configured in shape. At this time, the cross
section in the direction orthogonal to the depth direction of the first stage hole 20 and the
second stage hole 21 is configured concentrically. Further, an outer peripheral edge 20a in the
first stage hole 20 and connected to the outer surface 16a of the cover 16 and an outer
peripheral edge 21a in the second stage hole 21 and connected to the step 22 are four minutes
each. It is formed in an arc shape of 1.
[0013]
Then, in the transmission hole portion 19 of the above configuration, the thickness of the cover
16 (the depth of the transmission hole portion 19) is t, the depth of the first step hole portion 20
is x, and the first step hole portion 20 The diameter of the second stage hole 21 is D. The radius
of the arc of the outer periphery 20a of the first stage hole 20 is R. The arc of the outer
periphery 21a of the second stage hole 21. If the radius of r is r, then t = 1.5, x = 0.5, D = 2.5, d =
1.5, R = 0.5, r = 0.5 (each unit Mm).
[0014]
Thus, when the user makes a call using this mobile telephone 11, the air flow generated by the
utterance enters the inside of the transmission hole 19 from the outside in a substantially depth
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direction.
The air flow that has entered the transmission hole portion 19 strikes the sound collecting
surface of the condenser microphone 17 and is converted into an electric signal.
[0015]
Now, a case where natural wind strikes the mouthpiece portion 19 in a direction oblique to the
depth direction will be described with reference to FIG. When natural wind strikes the
transmission hole 19 in a direction oblique to its depth direction (see arrow P in FIG. 3), the open
end on the outer side of the transmission hole 19, ie 1 Turbulence or vortices are generated in
the vicinity of the outer peripheral edge portion 20 a of the step hole 20, and the turbulence or
vortices enter the inside of the mouthpiece portion 19.
[0016]
However, in this case, as described above, since the transmission hole portion 19 is configured in
a step shape of one step from the hole portion 20 of the first step, the hole portion 21 of the
second step, and the step portion 22 Most of the turbulent flow and vortices entering the inside
of the feed hole 19 are repelled by the step 22 and become swirled inside the first stage hole 20
(see arrow Q in FIG. 3). ). That is, the turbulent flow or the vortex generated by the natural wind
does not enter the inside of the hole 21 of the second stage, and does not hit the sound collecting
surface of the condenser microphone 17. In addition, since the first turbulent flow or vortex
swirls the inside of the first stage hole 20, natural wind from later does not easily enter the
transmission hole 19.
[0017]
At this time, since the outer peripheral edge portion 20a of the first stage hole portion 20 is
formed in an arc shape, most of the natural wind is along the outer peripheral edge portion 20a
of the first stage hole portion 20. It smoothly enters the inside of the mouthpiece 19 (see arrow R
in FIG. 3). That is, in the vicinity of the outer peripheral edge portion 20a of the first stage hole
portion 20, turbulent flow and vortex are less likely to occur.
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[0018]
Furthermore, since the outer peripheral edge portion 21a of the second stage hole portion 21 is
formed in an arc shape, the vortex staying inside the first stage hole portion 20 is temporarily
assumed to be the second stage hole portion 21. Most of the vortices enter the inside of the
second stage hole 21 smoothly along the outer peripheral edge 21a of the second stage hole 21
(see FIG. 3 middle arrow S)). That is, in the vicinity of the outer peripheral edge portion 21 a of
the hole 21 of the second stage, new turbulent flow and vortex are less likely to occur.
[0019]
As described above, according to the present embodiment, the transmission hole portion 19 of
the transmitter 14 is configured in a step shape of one step from the hole portion 20 of the first
step, the hole portion 21 of the second step, and the step portion 22. Therefore, even if
turbulence or vortices are generated by natural wind and the turbulence or vortices may enter
the inside of the mouthpiece portion 19, most of them are repelled by the step portion 22 and
one step Vortexing will occur inside the eye 20. Therefore, most of the turbulence and vortices
generated by the natural wind do not enter into the (deep) second-stage hole ahead of the firststage hole 20 and do not hit the condenser microphone 17. In addition, since the first turbulent
flow or vortex swirls the inside of the first stage hole 20, natural wind from later does not easily
enter the transmission hole 19.
[0020]
As a result, it is possible to reduce broadband frequency signals (noise for the caller) generated
by natural wind turbulence and vortices, and the caller can talk comfortably. Further, in this case,
since it is not necessary to separately provide an internal circuit for removing a wide band
frequency signal and a component such as rubber for absorbing a wide band frequency signal,
the configuration can be simplified and the cost is increased. There is no.
[0021]
Further, since the outer peripheral edge portion 20a of the first stage hole portion 20 is formed
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in an arc shape, most of the natural wind is smoothly transmitted along the outer peripheral edge
portion 20a of the first stage hole portion 20. Become inside 19 As a result, turbulence and
vortices are less likely to occur in the vicinity of the outer peripheral edge portion 20a of the first
stage hole portion 20, and it is possible to further reduce the signal of the wide band frequency.
[0022]
Furthermore, since the outer peripheral edge portion 21a of the second stage hole 21 is formed
in an arc shape, the vortex staying inside the first stage hole 20 is temporarily stored in the
second stage hole 21. Even if it enters, most of the vortices smoothly enter the inside of the
second stage hole 21 along the outer peripheral edge 21 a of the second stage hole 21. As a
result, new turbulence and vortices are less likely to be generated in the vicinity of the outer
peripheral edge 21 a of the hole 21 of the second stage, and the signal of the wide band
frequency can be further reduced.
[0023]
Now, the inventors conducted experiments described below and confirmed how the level of the
signal of the wide band frequency changes by changing the shape of the transmission hole
portion 19. Hereinafter, the experimental system and the experimental results will be described
with reference to FIGS. 4 to 7.
[0024]
First, FIG. 4 shows the configuration of the experiment system, and the transmission unit 31 is
configured as follows. The condenser microphone 17 of the mobile phone 11 described in the
embodiment is attached to the back side 32a of the acrylic plate 32 in a state of being held by
the microphone holder 18. The condenser microphone 17 is in communication with the front
surface side 32 b through the transmission hole 33 formed in the acrylic plate 32, and is
electrically connected to the portable telephone 11 by the cable 34. In the vicinity of the acrylic
plate 32, a fan 35 is disposed at a predetermined distance from the acrylic plate 32, and the air
flow generated by the fan 35 is oblique to the surface side 32b of the acrylic plate 32. It is
supposed to hit from the direction.
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[0025]
In the transmission unit 31 configured in this way, the air flow generated by the fan 35 and
entering the inside of the transmission hole 33 and hitting the sound collection surface of the
condenser microphone 17 is converted by the condenser microphone 17 into electricity. It is
converted to a signal. Then, the electric signal is output to the mobile telephone 11 through the
cable 34, converted into a radio wave signal by the mobile telephone 11, and then transmitted to
the receiver 36.
[0026]
The receiving unit 36 is configured as follows. The wireless base station 37 receives the radio
wave signal transmitted from the transmission unit 31, and converts the received radio wave
signal into an electric signal. The electric signal generated by the radio base station 37 is
branched by the branching unit 38 via a switch (not shown) and output to the telephone set 39
and the memory high coder 40. Then, the memory high coder 41 outputs the signal component
of the wide band frequency included in the given electric signal at the voltage level.
[0027]
By configuring the transmitting unit 31 and the receiving unit 36 in this manner, the
transmitting unit 31 artificially generates a broadband frequency signal that becomes noise for
the caller, and the receiving unit 36 generates the generated broadband frequency signal. Can be
measured at the voltage level.
[0028]
The above-mentioned transmission hole 33 is the first stage hole 20, the second stage hole 21
and the first stage hole 41 corresponding to the step 22 described in the embodiment, and the
second stage It comprises the hole 42 and the step 43.
Then, as shown in FIG. 5, the shape is as follows: depth x of first stage hole 41, diameter D of first
stage hole 41, diameter d of second stage hole 42, first stage It is determined by combining five
parameters of the radius R of the arc at the outer peripheral edge 41a of the hole 41 and the
radius r of the arc at the outer peripheral edge 42a of the second stage hole 42. In the present
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experiment, the shape of the transmission hole 33 was changed by changing these parameters.
Note that FIG. 6 shows parameter values in each parameter (unit: millimeter).
[0029]
Moreover, in the actual measurement, the distance, the angle, and the wind speed which the wind
from the fan 35 hits are constant under each condition where the shape of the transmission hole
33 is different. Furthermore, in order to reduce the influence of the line, data are collected 5 to 6
times under each condition, the average value of the remaining data from which the data of the
highest value and the lowest value are deleted is calculated, and the average value is used as the
condition And the result of Here, assuming that the thickness of the acrylic plate 32 (the depth of
the feeding hole 33) is t, t = 1.5 (millimeters), which is a component of the case of a general
portable telephone Is approximately equal to the thickness of
[0030]
Next, the experimental result of the present experiment will be described with reference to FIG.
In FIG. 7, five measurement results measured under typical conditions are shown by (a) to (e).
First, in (a) to (c) in FIG. 7, x = 0 and D = d (= 1.5) r = 0 in all cases, that is, the transmission hole
portion 33 is not a single step shape, When made cylindrical, it indicates how much the signal
level of the broadband frequency has changed due to the change of the value of R. In this case,
when R = 0 shown in (a) is compared with R = 1.0 shown in (b) and R = 0.5 shown in (c), (b) and
(c) are broader. It can be seen that the level of the frequency signal is decreasing.
[0031]
This is because, as described in the embodiment, when the outer peripheral edge portion 41a of
the first stage hole portion 41 is formed in an arc shape in the transmission hole portion 33,
most of natural wind is the first stage hole It is thought that this is because the air smoothly
enters the inside of the transmission hole 33 along the outer peripheral edge 41 a of the part 41,
and turbulence and vortices do not easily occur.
[0032]
Next, in (c) and (d) in FIG. 7, it is assumed that d = 1.5, R = 0.5, r = 0 in all, that is, in the
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transmission hole 33, the first stage hole When the outer peripheral edge portion 41a of 41 is
formed in an arc shape, it indicates how much the signal level of the wide band frequency has
changed due to the change in the values of x and D, that is, the difference in the presence or
absence of the step portion 43.
In this case, as compared with the case where there is no step 43 shown in (c) and the case
where there is step 43 shown in (d), the level of the signal of wide band frequency is obviously
lowered in (d). Know that
[0033]
This is because, as described in the embodiment, when the transmission hole portion 33 is
formed into a step shape of one step from the hole portion 41 of the first step, the hole portion
42 of the second step, and the step portion 43, Most of the turbulent flow and vortices entering
the inside of the portion 33 are repelled by the step portion 43 and become swirled inside the
hole 41 of the first stage, and the inside of the hole 42 of the second stage It is thought that it is
because it can not enter into. Furthermore, in this case, it is also possible that later natural wind
is less likely to enter the transmission hole 33 due to the turbulence and vortices that enter the
first stage swirling inside the hole 41 of the first stage. Is considered to be one of the factors that
cause the level of the
[0034]
Next, in (d) and (e) in FIG. 7, x = 0.5, d = 1.5, and R = 0.5 in all, that is, in the transmission hole
portion 33, the first stage When the outer peripheral edge portion 41a of the hole 41 is formed
in an arc shape and the step 43 is formed, it indicates how much the signal level of the wide band
frequency has changed by the change of the value of r. In this case, when r = 0 shown in (d) and r
= 0.5 shown in (e) are compared, it is apparent that the signal level of the broadband frequency is
lower in (e). I understand.
[0035]
This is because, as described in the embodiment, when the outer peripheral edge portion 42a of
the second stage hole 42 is formed in an arc shape in the transmission hole 33, it stagnates
inside the first stage hole 41. Even if there is a case where the swirling vortices enter into the
inside of the second stage hole portion 42, most of the vortices smoothly along the outer
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peripheral edge portion 42a of the second stage hole portion 42. It is considered that this is
because it enters into the inside of the hole portion 42 and it becomes difficult to generate new
turbulence and vortices.
[0036]
As described above, from these five measurement results (a) to (e), when t = 1.5, the transmission
hole 33 has x = 0.5, D = 2.5, d = 1.5, R = When the shape is set to 0.5, r = 0.5, it can be seen that
the level of the signal of the wide band frequency can be reduced well.
[0037]
In this experiment, the experiment was performed with t = 1.5, but as a range of t, it is sufficient
to satisfy 1.0 ≦ t ≦ 1.5 in consideration of practical problems. At this time, the range of x may
be 0.3 t ≦ x ≦ 0.5 t.
Further, the range of d may be 1.0 d ≦ 1.5, and the range of D may be 1.6 d ≦ D ≦ 1.8 d. .
At this time, the ranges of R and r may be set to 0 <R ≦ x and 0 <r ≦ (D−d) / 2, respectively.
[0038]
The present invention is not limited to the above embodiments, but can be modified or expanded
as follows. The present invention is not limited to a mobile phone, and may be applied to other
communication devices such as a personal handy phone system. The transmission hole portion
19 is not limited to one step, and may be formed in a step shape of two or more steps, and a
cross section orthogonal to the depth direction is not limited to a circular shape, and has a
square shape Also good.
[0039]
Brief description of the drawings
[0040]
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1 is a longitudinal side view showing an embodiment of the present invention
[0041]
Fig. 2 Top view of the mobile phone
[0042]
Figure 3 illustrates the operation
[0043]
Fig. 4 System configuration of experimental system
[0044]
Fig. 5 Cross section of the feeding hole
[0045]
Figure 6 shows the parameter values of each parameter
[0046]
Figure 7 Diagram showing the experimental results
[0047]
8 equivalent view showing a prior art example
[0048]
Explanation of sign
[0049]
In the drawing, 14 is a transmitter, 16 is a cover (main body), 17 is a condenser microphone
(microphone), 19 is a transmission hole, 20 is a first stage hole, 20a is an outer peripheral edge,
21 is a second stage The eye hole, 21a is an outer peripheral edge, and 22 is a step.
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