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JPH10271592

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DESCRIPTION JPH10271592
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
microphone device used for a portable telephone used in a place where the ambient noise is
large such as a portable telephone, PHS, etc.
[0002]
2. Description of the Related Art FIG. 4 is a side view and a partially enlarged sectional view
showing the configuration of a portable telephone including a conventional microphone device,
and FIG. 4 (a) shows the appearance of the portable telephone. It shows a part of the microphone
device. As a conventional microphone device such as a portable telephone, the front side of the
directional microphone 1 is housed inside the sound hole 3 of the telephone case 2 as described
above. Reference numeral 4 denotes a supporting device of the directional microphone 1, and 5
denotes a lead of the directional microphone 1.
[0003]
However, in such a conventional configuration, the sound waves entering from the sound hole 3
of the telephone case 2 interfere with each other because the volume of the sound hole 3 is
small. The phase information of the sound wave between two points on the front and back of the
directional microphone 1 for obtaining directivity is lost, and it is difficult to obtain practical
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directivity, and the transmission sound hole is enlarged. As described above, in the small volume
part of the incident sound wave, as described above, the phase as information of the arrival
direction of the sound wave given to the front and back of the directional microphone is totally
disturbed, and the directivity can not be obtained. The Therefore, in a telephone set
incorporating a directional microphone, there is a problem that it is extremely difficult to select
and transmit a target transmission voice to ambient noise.
[0004]
The present invention solves the above-mentioned conventional problems, and even if the
directional microphone is housed inside the telephone case, the original directional
characteristics of the directional microphone can be maintained, and the transmission voice for
ambient noise can be maintained. It is an object of the present invention to provide a microphone
device with extremely good selectivity.
[0005]
SUMMARY OF THE INVENTION A microphone device according to the present invention
comprises a directional microphone and a covering for covering the directional microphone, and
a sound corresponding to the directional microphone front and back portions of the covering is
provided. It is equipped with an introduction hole for introducing sound waves through a
conduit.
[0006]
According to the present invention, even when the directional microphone is housed inside the
telephone case, the microphone device can maintain the original directional characteristics of the
directional microphone and has extremely excellent selectivity of transmission voice to ambient
noise. Is obtained.
[0007]
Embodiments of the present invention will be described below with reference to the drawings.
[0008]
(First Embodiment) FIG. 1 is a cross-sectional view showing the configuration of a microphone
device according to a first embodiment of the present invention, FIG. 1 (a) shows the entire main
part, FIG. 1 (b) shows only the microphone portion Is shown enlarged.
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In FIG. 1 (a), transmission holes 16 and 17 are provided at the upper and lower portions of the
transmitter portion of the casing 11 of the portable telephone, and a close talk type microphone
or directional microphone (hereinafter referred to simply as The directional microphone 13 is
covered with the cap 14 and the cap 15 which make the upper and lower acoustic input terminal
parts covered, the peripheral part of both caps is sealed, and the sound wave is completely
between the cap 14 and the cap 15 It is supposed to be shut off.
FIG. 1B is an enlarged view of the directional microphone 13 and the portions of the caps 14 and
15.
[0009]
Cap 14 and cap 15 are respectively provided with an introduction hole 14 ′ and an introduction
hole 15 ′ for introducing a sound wave, and each introduction hole has two identical holes
respectively from the above-mentioned transmission hole 16 and transmission hole 17. A sound
conduit 12 and a sound conduit 12 'of the same length are connected.
The sound damping materials 19 and 19 'are respectively inserted into the sound conduits 12
and 12', and the output signal lead 18 of the electrical signal from the directional microphone 13
is made of the cap 15 and the directional microphone 13 It is pulled out to the outside through
the gap.
[0010]
Next, the operation will be described.
A sound wave incident on the front of the directional microphone 13 through the feed hole 16 is
introduced by the sound conduit 12 and a sound wave incident on the back of the directional
microphone 13 is also introduced by the sound conduit 12 '. In this way, the front and back of
the directional microphone 13 can receive the directional characteristic information obtained by
the directional microphone 13 being placed in the free sound field space as it is through the
sound conduit 12 and the sound conduit 12 '. Since both sound conduits have the same thickness
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and the same length, directivity information to the front and back of the directional microphone
can be equally derived. As a matter of course, the directional characteristics of the directional
microphone are directed toward the mouth where the speech voice is emitted, so that clear
speech can be performed even in high noise.
[0011]
Such directional information is disturbed to detect the arrival direction of the sound wave even if
the directional microphone is installed in the space for the transmitter simply provided inside the
casing of the portable telephone as in the conventional concept. However, if the directional
microphone 13 is incorporated in the portable telephone case 11 by the means as described
above, it is possible to transmit to the directional microphone 13. The sound field around the
microphone can be introduced as it is through the transmission holes 16, 17 and the sound
conduits 12, 12 ', so that the sound field information applied to the front and back of the
directional microphone 13 is transmitted as it is. The function can be exhibited without impairing
the directivity characteristic and the close talk characteristic possessed.
[0012]
As described above, according to the present embodiment, the sound field around the transmitter
is directly applied to the front and back of the directional microphone through the mouthpiece
and the sound conduit, so that the directional characteristics and close-talk characteristics of the
directional microphone Can fully exhibit its function without losing
In addition, if a sound pipe uses a rubber tube or a flexible tube similar to that, it is possible to
prevent the housing vibration to the directional microphone, and the flexibility of the tube allows
the installation place of the directional microphone. Some flexibility is obtained, and structural
constraints are less likely. In addition, the acoustic damping material inserted in the sound
conduit sufficiently suppresses the acoustic resonance characteristic generated by the sound
conduit and enables the external sound field characteristic to be transmitted as it is to the
directional microphone. It is possible to suppress the generation of blowing noise due to breath
when sending a voice, and to ensure a clear call.
[0013]
(Second Embodiment) FIG. 2 shows the configuration of the main part in the second embodiment
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of the microphone device of the present invention, FIG. 2 (a) is a sectional view thereof, and FIG.
2 (b) is a front view thereof. The same parts as those of the first embodiment are designated by
the same reference numerals and their detailed description will be omitted. The present
embodiment is a modification of the shapes of the caps 14 and 15 in the first embodiment, and is
characterized in the position of the sound wave introduction hole. As a portion of the directional
microphone 13 is shown in FIG. 2 (a), the front and back portions are covered with caps 20 and
21 as coverings, and the introduction holes 20 'and 21' for connecting sound conduits are
directional microphones, respectively. It is configured to face the diameter direction of the
peripheral portion of 13. The lead 18 of the directional microphone is drawn out from the gap
between the cap 20 and the directional microphone 13. Two sound conduits of the same
thickness and the same length, one end of which is connected to the transmission hole of the
portable telephone as shown in the first embodiment, are connected to the introduction holes 20
'and 21' of this sound wave. Sound waves from the outside are introduced through this sound
conduit.
[0014]
As described above, according to the present embodiment, since the introduction holes
connecting the sound conduits face the diameter direction of the peripheral portion of the
directional microphone, the connected sound conduits are drawn out in the same direction. The
degree of freedom can be obtained in the installation place of the directional microphone inside
the mobile phone and so on, and there is an advantage that the accommodation in a small space
can be improved. In the case of a thin mobile phone, in particular, the thickness of the directional
microphone portion can be suppressed thin, and it becomes easy to store. The vibration
preventing effect to the directional microphone and the like are completely the same as in the
first embodiment.
[0015]
(Third Embodiment) FIG. 3 shows the configuration of the main part in the third embodiment of
the microphone device of the present invention, FIG. 3 (a) is a sectional view thereof, and FIG. 3
(b) is a front view thereof. The same parts as those in the first and second embodiments are
designated by the same reference numerals and their detailed description will be omitted. The
present embodiment uses a covered case different from the structure of the cap in each of the
above-described embodiments, and is characterized in its configuration. That is, as shown in FIG.
3 (a), the front and back of the directional microphone 13 are completely separated, and the
covering microphone 22 is completely covered by sandwiching the directional microphone 13;
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This is attached to a mobile phone. The front appearance structure of the covering case 22 is as
shown in FIG. 3 (b). A sound conduit 23, 23 'for introducing a sound wave is connected to the
front and back of the directional microphone 13 in a row in the covering case 22 to form an
integrated structure. It can be opened to both left and right with the point 24 of the top of the
body as a fulcrum, and the middle point 25 of the sound conduits 23, 23 'is opened. As a material
which constitutes this covering case 22, a material of rubber system such as silicone rubber, a
material of plastic system such as ABS or the like is used. As shown in FIG. 3A, the lead 18 from
the directional microphone is drawn out from the gap between the midpoints 25 of the sound
conduits 23, 23 '.
[0016]
Next, the operation will be described. As shown in FIGS. 3 (a) and 3 (b), the cover 22 completely
sandwiches the main body of the directional microphone 13 with its apex 24 as a fulcrum, so the
peripheral portion of the directional microphone 13 is sealed. The sound wave leakage on the
front and back of the directional microphone 13 is shut off, and the sound waves introduced
through the sound conduits 23, 23 'connected at one end to the transmission hole of the mobile
phone are symmetrical on both the front and back. It is introduced into the directional
microphone 13 and no other sound wave is introduced, and the directional characteristics of the
directional microphone can be made the best state.
[0017]
As described above, according to the present embodiment, the sound leakage from the front and
back of the directional microphone is blocked by the coated case, and the respective sound waves
introduced through the sound conduit are both symmetrical in both front and back. Since the
other sound waves are not introduced, the directivity characteristic of the directional microphone
can be made the best state. In addition, since the coated housing is integrally formed,
manufacture with a mold is easy, and the directional microphone can be easily stored, and the
workability is good. In addition, when the cover housing is molded using, for example, a rubberbased material and the directional microphone is housed, the cover housing itself has a vibrationproof structure, so that no vibration is transmitted to the directional microphone, and the mobile
phone is portable. Vibration noise due to vibration from the telephone case can be prevented.
[0018]
As described above, according to the present invention, the sound field around the transmitter is
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directly applied to the front and back of the directional microphone through the mouthpiece and
the sound conduit, so a small case like a portable telephone is obtained. Even in close-talking
microphones and directional microphones housed in the body, it is possible to obtain the
advantageous effect that the performance of the directional microphone can be maximized
without any loss in close-talk characteristics and directional characteristics. Be
[0019]
Brief description of the drawings
[0020]
1 is a cross-sectional view showing the configuration in the first embodiment of the microphone
device of the present invention.
[0021]
2 is a cross-sectional view and a front view showing the configuration of the main part in the
second embodiment of the microphone device of the present invention.
[0022]
3 is a cross-sectional view and a front view showing the configuration of the main part in the
third embodiment of the microphone device of the present invention.
[0023]
4 is a side view and a cross-sectional view showing an example of the configuration of the
conventional microphone device.
[0024]
Explanation of sign
[0025]
11…Mobile phone casing, 12, 12 ', 23, 23' ... sound conduit, 13 ... directional microphone, 14, 15
... front and back caps, 16, 17 ... talk hole, 18 ... directional microphone lead wire, 19, 19 '...
acoustic damping material, 20, 21 ... cap, 22 ... coated case.
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