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JP2013098831

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DESCRIPTION JP2013098831
Abstract: To provide an external stereo microphone device capable of further improving the
feeling of operation when changing the direction of a microphone. An external stereo
microphone device attached to a portable electronic device includes a pair of symmetrically
arranged microphones 60, a pair of holder portions symmetrically arranged to accommodate the
pair of microphones 60, and A holder unit 40 having a connecting portion 48 for connecting a
pair of holders 46; a substantially cylindrical cylindrical portion 20 for rotatably supporting the
holder unit 40; and a main body portion 18 for housing the circuit board 22; And a roller 56 that
rolls on the inner peripheral surface of the cylindrical portion 20 with the rotation of the holder
unit 40. [Selected figure] Figure 4
Stereo microphone device
[0001]
The present invention relates to an external stereo microphone device attached to a portable
electronic device such as a mobile phone.
[0002]
In recent years, multi-functional portable electronic devices such as mobile phones, tablet
terminals, PDAs and the like are widely used.
Such portable electronic devices may be used for recording and recording applications. However,
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many portable electronic devices are not dedicated to recording (recording), and thus often do
not have a microphone suitable for recording. Therefore, some stereo microphone devices have
been proposed to be appropriately attached to such portable electronic devices.
[0003]
JP, 2009-171355, A JP, 4072679, A JP, 4753978, A
[0004]
In stereo microphone devices attached to such portable electronic devices, it is necessary to be
able to move the direction of the microphone in a wide range.
In particular, in mobile phones and the like, cameras may be attached to the front and back. In
such a mobile phone, it is desirable that the microphone be directed forward when shooting
moving images using the front camera, and the microphone be directed backward when shooting
moving images using the rear camera. The orientation should be changed approximately 180
degrees. When changing the direction of the microphone in this manner, the sense of operation
at the time of the change operation is naturally important. In particular, when the operation load
at the time of changing the direction of the microphone is excessively light, it is difficult for the
user to feel the fact that the operation has been performed, which gives the user a sense of
anxiety and a lack of material. However, at present, there is no known external stereo
microphone device considering its operation feeling.
[0005]
In addition, some stereo microphones incorporated in the recording apparatus can change the
direction of the microphones as appropriate. For example, Patent Documents 1 to 3 disclose a
recording device in which the direction of the microphone is variable. However, in Patent
Literatures 1-3, no consideration is given to the feeling of operation when changing the direction
of the microphone.
[0006]
Therefore, it is an object of the present invention to provide an external stereo microphone
device capable of further improving the feeling of operation when changing the direction of the
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microphone.
[0007]
The stereo microphone device of the present invention is an external stereo microphone device
attached to a portable electronic device, comprising a pair of symmetrically arranged
microphones and a pair of holder portions symmetrically arranged to accommodate the pair of
microphones. A holder unit including a connecting portion for connecting the pair of holders, a
substantially cylindrical cylindrical case rotatably supporting the holder unit, and an elastic
material, the holder unit being rotated And a rolling element rolling on an inner peripheral
surface of the cylindrical case.
[0008]
In a preferred aspect, at least one stopper groove is formed in the inner peripheral surface of the
cylindrical case, into which the top portion of the rolling element which has rolled is inserted.
In another preferred embodiment, the roller is sized to receive pressure from the inner
circumferential surface of the cylindrical case.
[0009]
According to the present invention, when the rolling element rolls on the inner peripheral surface
of the cylindrical portion, an appropriate operation load can be obtained, and the operation
feeling can be further improved.
[0010]
It is a perspective view of a stereo microphone device which is an embodiment of the present
invention.
It is an exploded perspective view of a stereo microphone device.
It is an exploded perspective view of a holder unit, and (A) is a perspective view seen from the
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upper part and (B) from the bottom. It is AA sectional drawing in FIG. FIG. 5 is a cross-sectional
view taken along line B-B in FIG. It is a perspective view of the holder unit in the conventional
microphone apparatus.
[0011]
Hereinafter, embodiments of the present invention will be described with reference to the
drawings. FIG. 1 is a perspective view of a stereo microphone device 10 according to an
embodiment of the present invention, and FIG. 2 is an exploded perspective view thereof.
Further, FIG. 3 is an exploded perspective view of the holder unit 40, and (A) is a perspective
view from above and (B) is a perspective view from below. 4 is a cross-sectional view taken along
line A-A of FIG. 1, and FIG. 5 is a cross-sectional view taken along line B-B of FIG.
[0012]
The stereo microphone device 10 is an external microphone device suitably attached to a
portable electronic device such as a mobile phone, a tablet terminal, a PDA or the like. FIG. 1
illustrates a mobile phone, in particular, a smartphone 100 which is a multifunctional mobile
phone equipped with a function similar to that of a PC.
[0013]
The stereo microphone device 10 has a substantially rectangular shape as a whole, and a
connection terminal 12 is formed so as to project from one end thereof, and can be electrically
connected to various electronic devices. Further, at the other end side, the two microphone units
16R and 16L (in the following, the subscripts R and L are omitted when the left and right are not
distinguished. Hereinafter, the same applies to other members), that is, the left microphone unit
16L and the right microphone unit 16R are coaxially symmetrically disposed. The two
microphone units 16 can be rotated 180 degrees around the major axis, and the direction can be
changed in a wide range. Thus, the reason why the movable angle of the microphone unit 16 is
180 degrees is to be compatible with various electronic devices.
[0014]
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That is, in the case of the stereo microphone device 10 connected to various electronic devices
such as a mobile phone and a tablet terminal, the preferable direction of the microphone unit 16
differs according to the type of the electronic device to be connected. For example, in the case
where a camera for shooting a moving image is connected to an electronic device installed on the
front side, it is desirable that the microphone unit 16 face the same as the camera. Conversely,
when a camera for shooting a moving image is connected to an electronic device installed on the
back side, it is desirable that the microphone unit 16 face the same as the camera. That is, the
desired orientation of the microphone unit 16 largely differs depending on the electronic device
to be connected. Furthermore, there are many electronic devices that are provided with cameras
for moving image shooting on both the front and back of the device, and in such electronic
devices, it is preferable to be able to record moving images with any camera. In order to achieve
this, the microphone unit 16 is desired to be able to rotate at least 120 degrees or more,
preferably 180 degrees or more. Therefore, in the present embodiment, the movable angle of the
microphone unit 16 is 180 degrees. Hereinafter, the configuration of the stereo microphone
device 10 will be described in detail.
[0015]
As shown in FIG. 2, the stereo microphone device 10 has a case 14 of a two-divided structure
including a front case 14 f and a rear case 14 b. The case 14 is roughly divided into a main body
portion 18 and a cylindrical portion 20.
[0016]
The main body portion 18 is substantially rectangular, and the circuit board 22 is accommodated
therein. The circuit board 22 includes an AD conversion circuit for converting a voltage signal
(analog) into a digital signal, an equalizer circuit for adjusting the sound quality of an audio
signal input from the microphone unit 16, and the like, as well as a volume knob 23a and a USB
port 23b. And user interface components such as connection terminals 12 are also mounted.
These user interface parts and the like are exposed to the outside through an opening 15 formed
in the side surface of the case 14.
[0017]
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The cylindrical portion 20 is configured by combining the semicircular portions formed on the
front case 14 f and the rear case 14 b at a portion that rotatably supports the holder unit 40. As
apparent from FIG. 4, three stopper grooves 24 extending in the long axis direction (vertical
direction in FIG. 4) are arranged at intervals of 90 degrees in the circumferential direction on the
inner peripheral surface of the cylindrical portion 20. Further, as is clear from FIG. 5, annular
protrusions 26 protruding inward are formed at both axial ends of the cylindrical portion 20.
[0018]
Here, as is clear from FIG. 4, in the present embodiment, the center of the cylindrical portion 20
is positioned slightly above the center of the main body 18 (right direction in FIG. 4) in the
thickness direction (left and right direction in FIG. 4). The cylindrical portion 20 is disposed
offset with respect to the main body portion 18 so that This arrangement relationship is to
shorten the length of the stereo microphone device 10 in the depth direction (vertical direction in
FIG. 4) and to improve the sense of stability when the stereo microphone device 10 is placed on a
flat surface. It is.
[0019]
The holder unit 40 rotatably supported by the cylindrical portion 20 is a holding member for
holding the two microphones 60. As shown in FIG. 3, the holder unit 40 is an assembly
composed of a plurality of parts, such as an upper holder piece 42a, a lower right holder piece
42b, a lower left holder piece 42c, and a press fitting 44. The assembled holder unit 40 is
roughly divided into two holder portions 46 for housing the microphones 60 and a connecting
portion 48 for connecting the two holder portions 46. The holder portion 46 is a substantially
cylindrical portion for housing the microphone 60, and the upper surface thereof is formed with
a taper which becomes lower toward the outside. A sound collection opening 50 for causing
ambient sound to reach the microphone 60 is formed in this tapered surface.
[0020]
In the holder portion 46, the microphone 60 for converting sound into a voltage signal is inclined
at about 45 degrees with respect to the major axis, that is, the sound collecting surface of the
microphone 60 is substantially parallel to the taper surface (See Figure 5). A lead wire 62 is
drawn out from the microphone 60 and is electrically connected to an electric circuit on the
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substrate 22. At substantially the center of the inner end face of the holder portion 46, a lead
wire hole 52 for passing the lead wire 62 is formed.
[0021]
Each holder portion 46 is covered by a microphone cap 70. Sound collecting holes 72 for making
ambient sound reach the microphone 60 are formed on the circumferential surface and the side
surface of the microphone cap 70. Then, the microphone unit 16 is configured by covering the
holder portion 46 with the microphone cap 70.
[0022]
The inner end portion of the holder portion 46 is formed with a small diameter portion 47 whose
outer diameter decreases stepwise. The outer diameter of the small diameter portion 47 is
smaller than the outer diameter of the connecting portion 48 described later, so the small
diameter portion 47 is like a groove between the connecting portion 48 and the holder portion
46. The width of the small diameter portion 47 is larger than the width of the annular protrusion
26 provided on the cylindrical portion 20 of the case 14, and the outer diameter of the small
diameter portion 47 is slightly smaller than the inner diameter of the annular protrusion 26.
When the stereo microphone device 10 is assembled, the small diameter portion 47 is
surrounded by the annular protrusion 26. By surrounding the cylindrical portion with the
annular projection 26, only rotation about the long axis of the holder unit 40 is permitted, and
other movements are restricted.
[0023]
The holder unit 40 has an abutting portion (not shown), and the case 14 has an abutted portion
(not shown) that abuts against the abutting portion when the holder unit 40 is rotated at a
predetermined angle. The rotation angle of the holder unit 40 is regulated by the contact portion
and the contact portion. In the present embodiment, the contact portion and the contact portion
are provided such that the movable angle of the holder unit 40 is approximately 180 degrees.
[0024]
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The two holder units 40 are connected by a connecting portion 48 in order to rotate in
conjunction. The connecting portion 48 is a plate-like portion provided on the outer peripheral
side of the lead wire hole 52 and connecting the vicinity of the peripheral edge of the two holder
portions 46. More specifically, as shown in FIG. 4, the substantially arc-shaped both ends are
substantially U-shaped bent inward by about 90 degrees. The outer diameter of the connecting
portion 48 is smaller than the inner diameter of the cylindrical portion 20 of the case 14, and a
gap of a distance H is formed between the two.
[0025]
Here, although the outer peripheral surface of the connection part 48 is circular arc shape, in
this embodiment, the central angle of the circular arc is about 75 degrees. In other words, the
circumferential width of the connecting portion 48 is about 1⁄5 of the entire circumference.
Although the movable range of the holder unit 40 is 180 degrees, in the state where the holder
unit is positioned at the center of the movable range, the connecting portion 48 is opposite to the
circuit board 22 across the major axis of the holder unit 40. Located on the side. The reason why
the connecting portion 48 is configured as such is as follows.
[0026]
In a conventional microphone device, for example, the microphone device disclosed in Patent
Document 1, as shown in FIG. 6, a connecting portion 48 that connects two holder portions 46
(in Patent Document 1, it is expressed as "shaft 25a") Was a perfect cylinder. In such a
conventional microphone device, the axially extending slits 90 a and the circumferentially
extending slits 90 b are formed on the side surface of the cylindrical connecting portion 48.
Then, the lead wire 62 from the microphone 60 accommodated in the holder portion 46 is drawn
out through the slit 90. When the movable angle of the microphone unit 16 is narrow as in the
microphone device of Patent Document 1, there has been no major problem even with the lead
wire 62 drawn using such slits 90a and 90b. However, as in the present embodiment, when the
movable angle of the microphone unit 16 is large (180 degrees), the lead wire 62 interferes with
the edge of the slit 90 with the rotation of the holder portion 46, and breakage of the lead wire
62 is caused. There was a case that caused it.
[0027]
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In the present embodiment, in order to reduce such problems, the circumferential width of the
connecting portion 48 is made sufficiently smaller than the entire circumference. Further, in the
state where the holder unit 40 is positioned at the center of the movable range, the connecting
portion 48 is positioned on the opposite side of the circuit board 22, that is, in the opposite
direction to the extending direction of the lead wire 62. With this configuration, as shown by the
two-dot chain line in FIG. 4, even if the holder unit 40 (connection portion 48) is rotated 180
degrees, the connection portion 48 does not interfere with the lead wire 62, and the lead Damage
to the line 62 can be effectively prevented.
[0028]
In the present embodiment, the width in the circumferential direction of the connecting portion
48 is about 1⁄5 of the entire circumference, but it may be 1⁄2 or less of the entire circumference
(the central angle of the arc of the outer circumferential surface is 180 ° or less) For example,
the width in the circumferential direction may be appropriately changed according to the
rotation range of the microphone unit 16, and if it is 1/4 or less of the entire circumference (the
central angle of the arc of the outer peripheral surface is 90 degrees or less), ,desirable.
[0029]
A substantially rectangular through hole 54 is formed substantially at the center of the
connecting portion 48, and the roller 56 protrudes to the outside through the through hole 54.
The roller 56 is a rolling element that rolls on the inner surface of the cylindrical portion 20 as
the holder unit 40 rotates around the long axis, and is made of an elastic material such as rubber
or a soft resin. On the inner surface of the connecting portion 48, a groove 49 for
accommodating the rotation shaft 56a of the roller 56 is formed. The roller 56 is rotatably held
by covering the groove 49 with the press fitting 44 while the rotation shaft is accommodated in
the groove 49. The rotating shaft 56a may be a shaft made of resin or metal, or may be a shaft
having a spring property.
[0030]
The outer diameter of the roller 56 is at least larger than the width of the stopper groove 24
formed in the cylindrical portion 20. Further, the amount of protrusion of the roller 56 from the
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outer surface of the connecting portion 48 is slightly larger than the gap amount H generated
due to the difference between the inner diameter of the cylindrical portion 20 and the outer
diameter of the connecting portion 48. The reason for setting such dimensions is as follows.
[0031]
In the absence of the roller 56, the holder unit 40 can be rotated with a very light operating load
(the force required to rotate the holder unit 40) with little resistance. When the operation load is
light as described above, the operation is easy, but the feeling of the operation is hard to occur,
giving the user a sense of anxiety and a lack of material. Further, when the roller 56 is not
present, the operation load is substantially the same at any angle, and there is also a problem
that it is difficult for the user to grasp the operation amount (rotation amount). Furthermore,
there is a problem that the holder unit 40 (microphone unit 16) can not stand still at a desired
angle because the operation load is light at any angle. Furthermore, there is a problem that the
holder unit 40 (microphone unit 16) vibrates and causes deterioration of the sound quality of the
audio signal to be recorded.
[0032]
In the present embodiment, the roller 56 is disposed to reduce such a problem. As described
above, in the roller 56 of the present embodiment, the amount of protrusion from the outer
surface of the connecting portion 48 is slightly larger than the gap amount generated by the
difference between the inner diameter of the cylindrical portion 20 and the outer diameter of the
connecting portion 48. Therefore, when the stereo microphone device 10 is assembled, the roller
56 receives a slight pressure from the inner surface of the cylindrical portion 20. This pressure
generates an appropriate operation load, and can give the user an appropriate operation feeling.
In addition, since the pressure generated between the roller 56 and the cylindrical portion 20
suppresses the vibration of the holder unit 40 (microphone unit 16), the sound quality of the
audio signal to be recorded can be improved.
[0033]
In addition, when the roller 56 receives pressure from the inner surface of the cylindrical portion
20, the vicinity of the contact portion of the roller 56 with the cylindrical portion 20 is elastically
deformed so as to be slightly flat. However, when the roller 56 reaches the stopper groove 24, as
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shown in FIG. 4, it elastically restores to a circular shape, and the top of the roller 56 enters the
stopper groove 24. The roller 56 that has entered the stopper groove 24 requires a relatively
large force to get over the stopper groove 24, and the operation load (the force required for
further rolling) will increase rapidly. Such a temporary increase in operation load is transmitted
to the user as a moderate click feeling. Then, by feeling the click feeling, the user can easily
recognize that a certain amount of rotation has occurred. Further, since the roller 56 does not go
over the stopper groove 24 unless a relatively large force is applied, the holder unit 40
(microphone unit 16) can be stopped at an angle corresponding to the stopper groove 24.
[0034]
That is, the holder unit 40 (microphone unit 16) is provided by providing the stopper groove 24
in the inner peripheral surface of the cylindrical portion 20 and providing the roller 56 which
rolls while being pressed against the inner peripheral surface of the cylindrical portion 20 in the
holder unit 40. The rotation operability of can be improved.
[0035]
In the present embodiment, three stopper grooves 24 are provided at intervals of 90 degrees, but
the number of stopper grooves 24 and the arrangement interval may be changed as appropriate,
and in some cases, the stopper grooves 24 may be omitted. You may
Further, the shape of the stopper groove 24 is not limited to the linear groove, but may be a
spherical groove or the like as long as the top of the roller can be inserted. Further, in the present
embodiment, the cylindrical roller 56 is used as the rolling element, but as long as it can roll on
the inner peripheral surface of the cylindrical portion 20, it may be a sphere instead of the roller
56. In any case, the rotational operability of the holder unit 40 (microphone unit 16) can be
improved by providing a rolling element that rolls while being pressed against the inner
peripheral surface of the cylindrical portion 20 as in the present embodiment.
[0036]
Further, the above-described configuration is an example, and at least the other configurations
may be appropriately changed as long as it has a rolling element that rolls on the inner
peripheral surface of the cylindrical portion as the holder unit rotates.
[0037]
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DESCRIPTION OF SYMBOLS 10 stereo microphone apparatus, 12 connection terminal, 14 case,
16 microphone unit, 18 main body part, 20 cylindrical part, 22 circuit board, 24 stopper groove,
26 annular protrusion, 40 holder unit, 46 holder part, 48 connection part, 49 stopper Grooves,
52 lead holes, 56 rollers, 60 microphones, 62 leads, 70 microphone caps.
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