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JP2009296279

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DESCRIPTION JP2009296279
[PROBLEMS] To provide a microphone capable of obtaining good frequency characteristics by
reducing diffraction effects and the like. A microphone (10) is provided with a microphone unit
(14) having a diaphragm (13) (or a condenser film) that vibrates with an input of voice and
obtaining an audio signal by the vibration of the diaphragm (13) (or condenser film). Then, the
microphone unit 14 is attached, and the housing 12 is connected to the periphery of the
diaphragm 13 (or the condenser film) on the surface of the microphone unit by a substantially
curved surface. [Selected figure] Figure 1
マイクロホン
[0001]
The present invention relates to a microphone for obtaining an audio signal according to an input
audio.
[0002]
In the conventional microphone, for example, a microphone unit having a cone-shaped
diaphragm is attached to a cylindrical housing, a planar microphone unit is attached, or a domeshaped microphone unit is attached. It is as a shape.
[0003]
Such a conventional microphone basically has one microphone unit attached to one housing, and
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the one microphone unit is made to input voice in all bands from low to high frequency It is
configured to convert to a signal.
There is also one for multiple recordings attached to one chassis, such as for stereo recording,
but even in this case, with each microphone unit, input the sound of all bands from low to high
frequency Is configured to be converted into an audio signal.
[0004]
Here, a so-called dynamic microphone unit using a diaphragm has been exemplified, but the
same applies to a condenser microphone unit using a condenser film.
Patent Document 1 describes an example of this type of microphone. JP 2000-324586 A
[0005]
By the way, it can not be said that the conventional microphones have necessarily obtained
sufficient characteristics. That is, since the housing to which the microphone unit is attached has
a cylindrical or square shape, deterioration of the on-axis characteristics due to the diffraction
effect, a recess from the baffle surface by the cone or dome shaped diaphragm, or an axis by the
protrusion In addition, the directivity characteristics are degraded, the reflection of sound from
the end of the baffle, the reflected sound inside the case, and the vibration sound of the case
itself are unnecessary, resulting in the deterioration of the audio signal obtained by the
microphone unit. The
[0006]
Also, the frequency band for collecting sound with a conventional microphone is the widest
range, around 20 Hz to 20 kHz, which is a general audio frequency range, but in recent years,
with the improvement of audio characteristics, sound is collected up to around 20 kHz to 100
kHz. There is a need for a microphone that can do this. Although the frequency band above 20
kHz is outside the audible band, recent studies have shown that it is possible to appeal to the
sense better by collecting and reproducing the frequency component outside the audible band.
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When considering a microphone that picks up to such a very high frequency, the occurrence of
unevenness in the frequency characteristic is particularly problematic.
[0007]
The present invention has been made in view of these points, and it is an object of the present
invention to provide a microphone capable of obtaining good frequency characteristics by
reducing diffraction effects and the like.
[0008]
The present invention is a microphone provided with a microphone unit that has a diaphragm or
a capacitor film that vibrates at the input of voice and that obtains an audio signal by the
vibration of the diaphragm or capacitor film.
Then, the microphone unit is attached, and a housing is provided that is connected to the
periphery of the diaphragm or capacitor film on the surface of the microphone unit by a
substantially curved surface.
[0009]
According to the present invention, it is possible to improve the characteristics of the
microphone by being connected to the casing at the location of the curved surface or the
periphery of the diaphragm or capacitor film on the surface of the microphone unit. Specifically,
the diffraction can be reduced by connecting with the periphery of the diaphragm or the
capacitor film at a portion of the substantially curved surface of the housing. Also, the peak dip
of the frequency characteristic due to the directivity characteristic is reduced, and a flat and good
frequency characteristic can be obtained. In addition, since no secondary sound source is
generated by diffraction, the quality of the received sound is improved, and the resolution is also
improved. In addition, since the housing to which the microphone unit is attached has a curved
surface portion, the housing has a shape-wise strong structure, which reduces cabinet vibration
and leads to an improvement in sound quality.
[0010]
In addition, when the low frequency range microphone unit and the high frequency range
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microphone unit are arranged, time alignment can be achieved, and the sound field reproduction
capability can be improved by reproducing the audio signal picked up by the microphone unit.
[0011]
Furthermore, by arranging a plurality of micro microphones on the curved surface portion, it is
possible to form a microphone which is excellent in frequency characteristics and can obtain
sensitivity.
[0012]
Hereinafter, a first embodiment of the present invention will be described with reference to FIG.
1 and FIG.
FIGS. 1A and 1B are a front view and a side view of a microphone of the present embodiment.
In the microphone 10 according to the present embodiment, as shown in FIG. 1A, a substantially
oval oval spherical casing 12 is attached to the tip of a cylinder 11 having a predetermined
length. The cylindrical portion 11 and the housing portion 12 are formed, for example, by metal
or resin molding.
[0013]
Then, the microphone unit 14 is mounted in the elliptical spherical casing 12. Here, the
microphone unit 14 is a so-called dynamic type unit provided with a diaphragm (diaphragm) 13.
Although the specific configuration of the inside of the dynamic type microphone unit 14 is not
particularly shown here, the diaphragm 13 vibrates by picking up the sound, and the vibration in
the unit vibrates the coil in the unit to be close to the coil. By the action of the magnet, an electric
signal (voice signal) is obtained from the coil.
[0014]
In the present embodiment, as shown in FIG. 1, the diaphragm 13 provided in the microphone
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unit 14 is disposed in a shape that is substantially integral with the surface of the housing 12.
That is, the peripheral edge of the diaphragm 13 is disposed so as to be continuous with the
surface of the housing 12. Further, the surface of the diaphragm 13 itself is a curved surface
having a curvature that is substantially integrated with the curved surface of the surface of the
housing 12.
[0015]
In the example of FIG. 1, the diaphragm 13 is disposed slightly on the tip side of the center of the
elliptical spherical casing 12 but may be disposed at another position of the casing 12. For
example, it may be disposed at the tip of the housing 12 (the uppermost position in FIG. 1).
[0016]
By adopting the configuration of the present embodiment, a microphone having excellent
characteristics can be obtained. FIG. 2 is a characteristic diagram illustrating this. FIGS. 2 (a) to 2
(d) show that the overall frequency characteristics as a microphone change depending on the
shape of a housing that accommodates the microphone unit, and FIGS. 2 (a) to 2 (d) The
frequency characteristics of are all obtained by changing only the shape of the housing using the
same microphone unit 1. In this example, a microphone unit 1 having sensitivity up to a
frequency of 100 kHz or more is used, and the microphone unit 1 is a relatively small one having
a diameter of about 4 mm. Moreover, as a size of housing | casing 2, 3, 4, 5 of each case, it is the
example made into the square shape of 30 mm one side.
[0017]
In the example of FIG. 2A, the microphone unit 1 is disposed on the upper surface of the squareshaped housing 2, and the corner 2a of the upper surface of the housing 2 is formed in a rightangled shape. When arranged in the case 2 having the shape shown in FIG. 2A, as shown in the
figure, a valley in which the sensitivity falls is generated at a frequency of about 20 kHz or more,
and the characteristic is not flat. .
[0018]
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In the example of FIG. 2 (b), the microphone unit 1 is disposed on the upper surface of the
quadrangular housing 3, and the corner 3a of the upper surface of the housing 3 is a curved
portion (R portion) having a radius of 5 mm. . When arranged in the case 3 having the shape
shown in FIG. 2 (b), the characteristics are flatter than in the state of FIG. 2 (a).
[0019]
In the example of FIG. 2C, the microphone unit 1 is disposed on the upper surface of the
quadrangular housing 4 and the corner 4a of the upper surface of the housing 4 is a curved
surface portion (R portion) having a radius of 10 mm. . When arranged in the case 4 having the
shape shown in FIG. 2C, the characteristics are flatter than the states shown in FIGS. 2A and 2B.
[0020]
In the example of FIG. 2 (d), the microphone unit 1 is disposed on the upper surface of the
quadrangular housing 5, and the corner 5a of the upper surface of the housing 5 is a curved
portion (R portion) having a radius of 15 mm. . When arranged in the case 5 of the shape shown
in FIG. 2D, the characteristics are flatter than the states of FIGS. 2A, 2B and 2C.
[0021]
As apparent from FIG. 2 as described above, by providing a curved surface integrated with the
diaphragm on the surface of the microphone unit as a housing for housing the microphone unit,
the diffraction effect can be reduced and the characteristics are improved. be able to. As shown
in FIG. 2 (a), in the case where the case has a right angled corner, diffraction effects occur to
deteriorate the characteristics, and a reflected sound is generated due to the shape of the corner
portions. The sound quality is worse than it appears. In experiments conducted by the applicants
of the present patent application, the diaphragm has a shape integrated with the surface of the
casing as the spherical casing configuration shown in FIG. It has been found that it can be
characterized.
[0022]
Further, by providing the curved portion in the housing for housing the microphone unit, the
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structure is strong in shape, and the vibration of the housing itself is reduced, which contributes
to the improvement of the sound quality.
[0023]
The curvature of the curved surface of the housing surface (baffle surface) continuous with the
diaphragm of the microphone unit is 1/8 of the size of one side of the baffle surface (that is, the
surface around the diaphragm) as a plane. When it is set as the curved surface of the above
radius, it becomes a favorable characteristic.
[0024]
Next, a second embodiment of the present invention will be described with reference to FIG.
FIG. 3 is a front view of the microphone of this embodiment.
In the microphone 20 according to the present embodiment, as shown in FIG. 3, the tip end of a
cylindrical casing 21 having a predetermined length is a curved surface 22 in which a
semicircular shape is curved at a predetermined curvature. Then, the diaphragm 23 of the
microphone unit 24 is disposed at the tip of the curved surface portion 32. The diaphragm 23 in
this example also has a curved surface shape having a curvature that is semispherically
integrated with the curved surface portion 32 on the housing 21 side. The housing unit 21 is
made of metal, resin or the like.
[0025]
In the case of the configuration shown in FIG. 3 as well, a microphone with good characteristics
can be obtained as in the case of the first embodiment.
[0026]
Next, a third embodiment of the present invention will be described with reference to FIG.
FIG. 4 is a front view of the microphone of this embodiment. As shown in FIG. 4, the microphone
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30 according to the present embodiment has a curved surface portion 32 which is a curved
surface portion 32 in which the edge of the tip of a cylindrical housing portion 31 having a
predetermined length is bent at a predetermined curvature. The tip portion enclosed is a flat
portion 33. The diaphragm 34 of the microphone unit 35 is disposed on the flat portion 33. The
diaphragm 34 in this example has a convexly curved curved surface shape. The housing 31 is
made of metal, resin or the like. The curvature of the curved surface portion 32 is, for example, a
radius of 1/8 or more of the diameter of the housing portion 31.
[0027]
Also in the case of the configuration shown in FIG. 4, a microphone with good characteristics can
be obtained as in the first and second embodiments.
[0028]
Next, a fourth embodiment of the present invention will be described with reference to FIG.
FIG. 5 is a front view of the microphone of this embodiment. The microphone 40 according to the
present embodiment, as shown in FIG. 5, is a curved surface portion 42 of the end of the tip of a
cylindrical housing portion 41 having a predetermined length, which is curved at a
predetermined curvature. The tip portion enclosed is a flat portion 43. The flat diaphragm 44 of
the microphone unit 45 is disposed on the flat portion 43. The housing 41 is made of metal, resin
or the like. The microphone 40 of the example of FIG. 5 is different from the microphone 30 of
the example of FIG. 4 in that the diaphragm 44 has a planar shape. The curvature of the curved
surface portion 42 is, for example, a radius of 1/8 or more of the diameter of the housing portion
31.
[0029]
Also in the case of the configuration shown in FIG. 5, a microphone with good characteristics can
be obtained as in the case of each of the embodiments described above.
[0030]
Next, a fifth embodiment of the present invention will be described with reference to FIG.
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6 (a) and 6 (b) are a front view and a top view of the microphone of this embodiment. In the
microphone 50 according to the present embodiment, as shown in FIG. Then, a substantially
spherical casing 53 is provided at the tip of the small diameter portion 52. Then, the diaphragm
54 of the microphone unit (not shown) is disposed at the tip of the spherical casing 53. The
diaphragm 54 in this example has a curved surface shape that is curved in a convex shape, and
has a curvature that is continuous with the spherical casing 53. The housing 53 is made of metal,
resin or the like. In the example shown in FIG. 6, the casing 53 has a spherical shape with a
constant radius, but may have an oval shape such as an oval.
[0031]
Also in the case of the configuration shown in FIG. 6, as in the case of each of the embodiments
described above, a microphone with good characteristics can be obtained.
[0032]
Next, a sixth embodiment of the present invention will be described with reference to FIG.
FIGS. 7A and 7B are a front view and a top view of the microphone of the present embodiment. In
the microphone 60 of the present embodiment, as shown in FIG. 7, the tip of the cylindrical
portion 61 having a predetermined length is located near the tip, as a small diameter portion 62.
Then, at the tip of the small diameter portion 62, a substantially spherical housing portion 63 is
provided. Then, a flat surface portion 64 is provided at the tip of the spherical housing portion
63, and the diaphragm 65 of the microphone unit (not shown) is disposed on the flat surface
portion 64. The diaphragm 65 in this example has a planar shape that is continuous with the flat
surface portion 64 of the surrounding case, and is configured to be continuous with the shape of
the housing portion 63. The housing 63 is made of metal, resin or the like. Also in the example of
this FIG. 7, although the housing part 63 was made into the spherical shape of a fixed radius, you
may comprise it in elliptical shape like an egg shape, for example.
[0033]
Also in the case of the configuration shown in FIG. 7, a microphone with good characteristics can
be obtained as in the case of each of the embodiments described above.
[0034]
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Next, a seventh embodiment of the present invention will be described with reference to FIG.
FIGS. 8A and 8B are a front view and a side view of the microphone of the present embodiment.
The microphone 10 'of this embodiment is the same as the microphone 10 described in the first
embodiment in terms of the basic configuration of the housing. That is, as shown in FIG. 8 (a), a
substantially egg-shaped, elliptical spherical-shaped casing 12 is attached to the tip of a
cylindrical portion 11 having a predetermined length. The cylindrical portion 11 and the housing
portion 12 are formed, for example, by metal or resin molding.
[0035]
Then, the diaphragms 15 and 16 of the plurality of microphone units 17 and 18 are attached to
the inside of the elliptical spherical casing 12. In this example, the two microphone units 17 and
18 are vertically disposed on the spherical casing 12 along the axis of the microphone 10 '(the
central axis of the cylinder 11). Here, the microphone unit 17 is a microphone unit for the low
frequency range equipped with the low frequency range diaphragm 15, and the microphone unit
18 is a high frequency range microphone unit equipped with the high frequency range
diaphragm 16. The high frequency range diaphragm 16 has a shape larger than that of the low
frequency range diaphragm 15, and each of the diaphragms 15 and 16 is a curved surface
having a curvature such that it is continuous with the surface of the elliptical spherical housing
portion 12. As a frequency band of the sound collected by each of the microphone units 17 and
18, for example, a signal of each frequency component is synthesized as a frequency lower than
the frequency of about 100 Hz and a frequency higher than the frequency of about 100 Hz. It is
configured to output from '.
[0036]
As shown in FIG. 8, by configuring as a so-called two-way type microphone, for example, when
the high frequency range microphone unit is made to input a high frequency of about 100 kHz, a
low frequency sound such as 100 Hz or less is obtained. There is no need to handle it, and it is
possible to make a microphone configuration suitable for high-frequency sounds, and it is only
necessary to handle low-frequency sounds of about 100 kHz or less for microphone units on the
low-frequency side. As a result, it is possible to obtain good characteristics from low to high
range sounds. Moreover, in the case of the configuration of the present embodiment, the
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respective diaphragms 15 and 16 have a curved surface shape having a curvature continuous
with the curved surface shape of the housing 12 so that the diffraction effect is reduced and
good characteristics are obtained. And better characteristics are obtained. Further, in the case of
the configuration of the present embodiment, since time alignment of the two diaphragms 15
and 16 can be taken, the sound field reproduction ability is improved.
[0037]
Next, an eighth embodiment of the present invention will be described with reference to FIG. 9
(a) and 9 (b) are a front view and a top view of the microphone of this embodiment. In the
microphone 70 of the present embodiment, as shown in FIG. 9, the tip of the cylindrical portion
71 having a predetermined length is located near the tip, as a small diameter portion 72. Then, at
the tip of the small diameter portion 72, an oval oval-shaped housing portion 73 is provided.
Then, the low-range diaphragm 74 and the high-range diaphragm 75 are attached to the ovalshaped housing 73. The low-range diaphragm 74 and the high-range diaphragm 75 are
arranged, for example, vertically in the longitudinal direction of the cylindrical portion 71, and
each of the diaphragms 74 and 75 has a spherical shape with a convexly curved surface shape.
The curvature is continuous with the housing portion 73. The housing 73 is made of metal, resin
or the like. In the example shown in FIG. 9, the casing 53 has an oval oval shape, but may have,
for example, a substantially perfect spherical shape. The setting of the frequency band shared by
the low-range diaphragm 74 and the high-range diaphragm 75 is the same as that in the example
of FIG. 8, for example.
[0038]
Also in the case of the configuration shown in FIG. 9, as in the case of the example of FIG. 8, a
microphone with good characteristics can be obtained.
[0039]
Next, a ninth embodiment of the present invention will be described with reference to FIG.
FIG. 10 is a front view of the microphone of the present embodiment. In the microphone 80
according to the present embodiment, as shown in FIG. 10, the tip end of a cylindrical casing 81
having a predetermined length is a curved surface 82 in which the curvature is semispherically
curved at a predetermined curvature. Then, a diaphragm 83 of a microphone unit (not shown) is
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disposed at the tip of the curved surface portion 82. The vibrating plate 83 in this example also
has a curved surface shape of curvature that is semispherically integrated with the curved
surface portion 82 on the housing 81 side. The housing 81 is made of metal, resin or the like.
[0040]
Here, as a microphone unit provided with the diaphragm 83 of the present embodiment, the
microphone unit has a directivity having high sensitivity to sound from a predetermined
direction (for example, the upper side in FIG. 10). In order to give this directivity, a plurality of
slits 84 are provided at a predetermined interval at a position slightly lower than the tip of the
housing 81 to function as a back pressure intake slit.
[0041]
Also in the case of the directional microphone shown in FIG. 10, a microphone with good
characteristics can be obtained.
[0042]
Next, a tenth embodiment of the present invention will be described with reference to FIG.
FIG. 11 is a front view of the microphone of the present embodiment. In the microphone 90
according to the present embodiment, as shown in FIG. 11, the tip end of a cylindrical portion 91
having a predetermined length is used as a small diameter portion 92. Then, at the tip of the
small diameter portion 92, a substantially spherical housing portion 93 is provided. Then, the
diaphragm 94 of the microphone unit (not shown) is disposed at the tip of the spherical housing
portion 93. The diaphragm 94 in this example has a curved surface shape that is convexly
curved, and has a curvature that is continuous with the spherical housing portion 93. The
housing 93 is made of metal, resin or the like.
[0043]
The microphone unit provided with the diaphragm 94 of the present embodiment is configured
to have directivity, having high sensitivity to sound from a predetermined direction (for example,
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the upper side in FIG. 11). In order to give this directivity, a plurality of slits 95 are provided at
predetermined intervals in the lower position of the casing 93 to function as slits for introducing
back pressure.
[0044]
Also in the case of the directional microphone shown in FIG. 11, a microphone with good
characteristics can be obtained.
[0045]
Next, an eleventh embodiment of the present invention will be described with reference to FIG.
FIG. 12 is a front view of the microphone of the present embodiment. In the microphone 100
according to the present embodiment, as shown in FIG. 12, the tip end of a cylindrical casing 101
having a predetermined length is a curved surface 102 having a semispherical shape and a
predetermined curvature. Then, a large number of micro microphone units 103 are disposed on
the surface of the curved surface portion 102. The minute microphone units 103 each have a
minute size of, for example, several mm square, and each microphone unit 103 includes a
diaphragm (not shown).
[0046]
The audio signals obtained by the microphone units 103 arranged in large numbers are
combined to form an output audio signal of the microphone 100 as a signal of one system. With
the configuration shown in FIG. 12, a microphone with good characteristics can be obtained.
[0047]
Next, a twelfth embodiment of the present invention will be described with reference to FIG. FIG.
13 is a front view of the microphone of this embodiment. In the microphone 110 according to
the present embodiment, as shown in FIG. 13, the tip of the cylindrical portion 111 having a
predetermined length is located near the tip, as a small diameter portion 112. Then, a
substantially spherical casing 113 is provided at the tip of the small diameter portion 112. Then,
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a large number of micro microphone units 114 are disposed on the surface on the tip side (upper
side) of the spherical casing 113. For example, one micro microphone unit 114 has a micro size
of about several mm square, and each microphone unit 114 includes a diaphragm (not shown).
[0048]
The voice signals obtained by the many microphone units 114 arranged are combined to form an
output voice signal of the microphone 110 as a signal of one system. Also with the configuration
shown in FIG. 13, a microphone with good characteristics can be obtained.
[0049]
In each of the embodiments described so far, the diaphragm included in each microphone unit is
directly exposed to the outside of the microphone, but some protective member is provided on
the surface of the housing on which the diaphragm is disposed. It may be arranged. For example,
a metal or resin molded mesh-like protective member may be placed on the microphone unit
arrangement position. Alternatively, a protective member such as a sponge-like wind screen may
be covered. In any case, it is preferable to dispose a protective member having a configuration
that does not degrade acoustic characteristics.
[0050]
In each of the embodiments described above, the microphone unit provided with the diaphragm
is a microphone unit provided as a microphone, but the present invention is also applicable to
microphone units of other types. For example, the present invention may be applied to a
semiconductor microphone in which a microphone is configured by a semiconductor chip. Since
this semiconductor microphone is a small microphone unit, it is particularly suitable for
arranging a large number of microphone units as in the example of FIG. 12 or the example of
FIG. 13, for example. Alternatively, it may be applied to a so-called condenser type microphone
unit in which a condenser film is disposed instead of the diaphragm and the vibration due to the
input sound of the condenser film is detected by a change in dielectric constant. However, the
capacitor film provided in the capacitor type microphone unit is planar, and is disposed in a
plane, and the periphery of the capacitor film is connected to the curved surface on the housing
side.
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[0051]
Moreover, the shape illustrated in each embodiment shows a suitable example, and is not limited
to each illustrated shape. For example, although the oval shape is shown as an example of the
oval shape of the housing portion, various circular shapes such as other oval shapes, a rugby ball
shape, etc. are applicable.
[0052]
Also, although the microphone shown in the description so far is a microphone unit disposed in a
spherical or other housing, and configured to obtain an audio signal of one channel, for example,
a predetermined interval is disposed in a spherical housing A plurality of microphone units may
be arranged to obtain audio signals of different channels (right and left channels) respectively.
[0053]
FIG. 1A is a front view and a side view showing a configuration example of a microphone
according to a first embodiment of the present invention.
It is a wave form diagram which shows the example of a characteristic of the microphone by the
shape of a housing. It is a front view showing an example of composition of a microphone by a
2nd embodiment of the present invention. It is a front view showing an example of composition
of a microphone by a 3rd embodiment of the present invention. FIG. 14A is a front view and a
top view showing a configuration example of a microphone according to a fourth embodiment of
the present invention. They are the front view and top view which show the structural example of
the microphone by 5th Embodiment of this invention. FIG. 16A is a front view and a top view
showing a configuration example of a microphone according to a sixth embodiment of the
present invention. FIG. 24A is a front view and a side view showing a configuration example of a
microphone according to a seventh embodiment of the present invention. FIG. 24A is a front view
and a top view showing a configuration example of a microphone according to an eighth
embodiment of the present invention. It is a front view which shows the structural example of the
microphone by the 9th Embodiment of this invention. It is a front view which shows the example
of a structure of the microphone by 10th Embodiment of this invention. It is a front view which
shows the example of a structure of the microphone by 11th Embodiment of this invention. It is a
front view showing an example of composition of a microphone by a 12th embodiment of the
present invention.
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Explanation of sign
[0054]
DESCRIPTION OF SYMBOLS 1 ... microphone unit, 2, 3, 4, 5 ... housing | casing, 2a, 3a, 4a, 5a ...
housing | casing corner | angular part (R part), 10, 10 '... microphone, 11 ... cylinder part, 12 ...
housing part, 13: diaphragm, 14: microphone unit, 15: diaphragm for low frequency range, 16:
diaphragm for high frequency range, 17: microphone unit for low frequency range, 18:
microphone unit for high frequency range, 20: microphone, 21: housing portion 22: Curved
surface portion 23: Vibration plate 24: Microphone unit 30: Microphone 31: Housing portion 32:
Curved surface portion 33: Flat portion 34: Vibration plate 35: Microphone unit 40: Microphone
41 ... Body portion 42: Curved surface portion 43: Flat surface portion 44: Diaphragm 45:
Microphone unit 50: Microphone 51: Tubular portion 52: Small diameter portion 53: Housing
portion 54: Diaphragm 60 ... Microphone, 61 ... tube portion, 6 ... Small diameter portion 63:
Housing portion 64: Flat surface portion 65: Diaphragm 70: Microphone 71: Tubular portion 72:
Small diameter portion 73: Housing portion 74: Diaphragm for low frequency range 75: A
diaphragm for high frequency range, 80: microphone, 81: housing portion, 82: curved surface
portion, 83: diaphragm, 84: slit, 90: microphone, 91: cylindrical portion, 92: narrow diameter
portion, 93: housing portion, 94 ... diaphragm, 95 ... slit ... 100 ... microphone ... 101 ... housing ...
102 ... curved surface ... 103 ... micro microphone unit 110 ... ... microphone ... 111 ... cylinder ...
112 ... small diameter ... 113 ... housing ... 114 ... Micro microphone unit
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