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JP2017069919

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Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JP2017069919
Abstract: The present invention provides a stereo recording microphone unit capable of
switching the arrangement of left and right microphones to a true XY method and another
method. The microphone unit for stereo recording includes a pair of left and right single
directivity microphones (10, 20) and a projection / retraction mechanism coupled to each of the
left and right microphones (10, 20), wherein the projection / retraction mechanism is When it
becomes possible to change the horizontal angle and the vertical position of each of the left and
right microphones 10 and 20, and when the horizontal angle of the left and right microphones
10 and 20 becomes an angle at which the sound collection axes cross each other, The positions
of the left and right microphones 10 and 20 in the vertical direction are made different from
each other, whereby at least a part of the left and right microphones 10 and 20 are vertically
overlapped, and the horizontal angles of the left and right microphones 10 and 20 are mutually
When the sound axes do not intersect, the vertical positions of the left and right microphones 10
and 20 are made to be the same. [Selected figure] Figure 4
Microphone unit for stereo recording
[0001]
The present invention relates to a stereo recording microphone unit that can be applied to a
video recorder, an audio recorder, an external microphone, and the like.
[0002]
Generally, devices such as video recorders, audio recorders or external microphones are
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equipped with a pair of left and right microphones to record sound sources in stereo.
The left and right microphones are provided in an arrangement suitable for stereo recording. For
example, it is known to arrange the left and right microphones in a V-shape, an inverted V-shape
or in parallel. Among these, the inverted V-shaped arrangement is called an XY method. In the XY
method, the sound collection axes of the left and right microphones cross each other. The XY
method is superior to the localized representation of the recorded sound as compared with other
arrangements. That is, according to the XY method, the arrangement relationship of sounds is
expressed in the perspective direction as well as in the left and right direction. Furthermore, the
XY method is excellent for sound recording from the front.
[0003]
Conventionally, a recording device capable of changing the arrangement of the left and right
microphones has been proposed. For example, Patent Documents 1 to 4 listed below disclose
voice recorders capable of changing the arrangement of the left and right microphones to any of
V-shaped, inverted V-shaped, or parallel.
[0004]
JP, 2012-54742, A JP, 2011-114623, A JP, 2009-171249, A JP, 2008-311802, A
[0005]
<First problem> The above-described conventional recording devices have a problem that the
recording quality is low when the left and right microphones are arranged in an inverted V
shape.
As shown in Patent Documents 1 to 4, the conventional recording device has a configuration in
which the left and right microphones are simply arranged in an inverted V shape on the same
plane, so that high recording quality of the XY system can be realized. Can not. In order to realize
high recording quality of the XY system, firstly, the left and right microphones must be disposed
at different positions in the vertical direction, and secondly, the left and right microphones must
be disposed overlapping in the vertical direction . The inverted V-shaped arrangement in the
conventional recording device lacks the two configurations required for the XY system, and can
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not be said to be a true XY arrangement in a strict sense. For this reason, in the conventional
inverted V-shaped arrangement, the positional relationship in the perspective direction of the
recorded sound is not sufficiently expressed. In addition, the conventional inverted V-shaped
arrangement can not sufficiently record the sound from the front. That is, in the conventional
recording device, the merit of the XY method can not be obtained.
[0006]
<Second problem> The present applicant manufactures and sells video recorders in which left
and right microphones can be housed in a case. This video recorder is distributed in the market
under the trade name "Q4". In the applicant's “Q4”, the left and right microphones are
expanded when recording, and the left and right microphones are stored when not recording.
The left and right microphones of “Q4” are arranged in an inverted V shape and arranged at
different positions in the vertical direction. The left and right microphones of "Q4" are arranged
in the true XY system in the unfolded state, and high recording quality can be obtained. However,
when in the stored state, the left and right microphones are not arranged in a V shape, an
inverted V shape, or in parallel, and there is a problem that the recording quality is degraded. For
this reason, when the user neglects the expansion operation of the left and right microphones
and records in the stored state, the recording quality is degraded.
[0007]
An object of the present invention is to provide a microphone unit for stereo recording that
exhibits the following technical effects. -The arrangement of the left and right microphones can
be switched between the true XY method and another method-High recording quality can be
obtained when the left and right microphones are arranged in the true XY method-The left and
right microphones are housed in the housing Good recording quality can be obtained even in
[0008]
(1) In order to achieve the above object, a stereo recording microphone unit according to the
present invention includes a stereo that includes a pair of left and right single directivity
microphones, and an in / out mechanism coupled to each of the left and right microphones. A
microphone unit for recording, wherein the projecting / retracting mechanism makes it possible
to change the horizontal angle and the vertical position of the left and right microphones, and the
horizontal angles of the left and right microphones are mutually accommodated. When the sound
axis crosses at an angle, the vertical positions of the left and right microphones are made
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different, whereby at least a part of the left and right microphones are arranged to overlap in the
vertical direction, The vertical direction of the left and right microphones when the horizontal
angle is an angle at which the respective sound collection axes do not intersect with each other
The position in the same, as configured.
[0009]
(2) Preferably, in the microphone unit for stereo recording of (1), when at least a part of the left
and right microphones are arranged to overlap in the vertical direction, the sound collecting
surfaces of the left and right microphones are perpendicular to each other. Intersect on the same
axis of
[0010]
(3) Preferably, in the microphone unit for stereo recording of (1) or (2) above, the angle between
the sound collection axes intersecting each other is in the range of about 90 to 135 °.
[0011]
(4) Preferably, in the stereo recording microphone unit according to any one of the above (1) to
(3), assuming a vertical reference position, the vertical positions of the left and right microphones
are at the reference position. When the time is defined as the stored state, and when the vertical
position of the left and right microphones is above the reference position as the expanded state,
the projection / retraction mechanism is in the stored state. The positions of the left and right
microphones in the vertical direction are made the same, and the positions of the left and right
microphones in the vertical direction are made different in the expanded state.
[0012]
(5) Preferably, in the stereo recording microphone unit according to any one of the above (1) to
(4), the projecting and retracting mechanism comprises: a pair of vertically extending shafts
coupled to the left and right microphones; -A pair of guide grooves provided on the wall surface
of each shaft, or the wall surface of another member surrounding each shaft,-A pair of guide
projections locked in each guide groove, at least the guide grooves A part is inclined and
configured to mutually convert rotation and vertical movement of the shaft.
[0013]
(6) Preferably, in the stereo recording microphone unit of (5), the projection and retraction
mechanism further includes an elevating mechanism for moving at least each shaft up and down.
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[0014]
The microphone unit for stereo recording of the present invention has the following technical
effects.
[0015]
First, the projection / retraction mechanism makes it possible to switch the arrangement of the
left and right microphones between the true XY method and another method.
That is, when the horizontal angle of the left and right microphones becomes an angle at which
the sound collection axes intersect with each other, the in / out mechanism makes the vertical
positions of the left and right microphones different.
At this time, at least a part of the left and right microphones are arranged to overlap in the
vertical direction.
Thereby, the arrangement of the left and right microphones becomes a true XY method.
On the other hand, when the horizontal angle of the left and right microphones is an angle at
which the respective sound collection axes do not intersect, the in / out mechanism makes the
vertical positions of the left and right microphones the same.
At this time, by arranging the left and right microphones in a V shape or in parallel, an
arrangement of another system other than the XY system is realized.
[0016]
Second, the left and right microphones provide high recording quality when in a true XY
arrangement.
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That is, when the left and right microphones are arranged in the true XY system, the positions in
the vertical direction are different, and at least a part thereof is arranged to overlap in the
vertical direction.
Thereby, the arrangement relationship of the recorded sound is expressed in the perspective
direction in addition to the lateral direction. Moreover, it becomes possible to record the sound
from the front favorably.
[0017]
Third, the left and right microphones provide good recording quality even when stored in a
housing. That is, the left and right microphones are arranged in the true XY system when
expanded from the housing. On the other hand, the left and right microphones are arranged in
another method when they are housed in a housing. Thus, the left and right microphones provide
good recording quality based on different schemes in both the stowed and deployed states.
[0018]
FIG. 1 shows a video recorder provided with a stereo recording microphone unit according to an
embodiment of the present invention. FIGS. 1 (a) to 1 (d) show the accommodated state of the left
and right microphones. FIG. 1A is a front view. FIG. 1 (b) is a plan view. FIG. 1C is a right side
view. FIG. 1D is a rear view. FIGS. 2 (a) to 2 (d) all show a first unfolded state of the left and right
microphones. FIG. 2A is a front view. FIG. 2 (b) is a plan view. FIG. 2C is a right side view. FIG. 2D
is a rear view. FIGS. 3A to 3D all show a second unfolded state of the left and right microphones.
FIG. 3A is a front view. FIG. 3 (b) is a plan view. FIG. 3C is a right side view. FIG. 3D is a rear view.
FIG. 4 is a front view showing the projection and retraction operation of the left and right
microphones. FIG. 5A is a perspective view showing the left and right microphones and the shaft.
FIG. 5 (b) is a partial cross-sectional view of FIG. 5 (a). FIG. 6A is a perspective view showing the
projection and retraction mechanism of the left and right microphones. FIGS. 6 (b) to 6 (d) are
plan sectional views showing the projection and retraction mechanism until the left and right
microphones shift from the V-shaped arrangement to the inverted V-shaped arrangement. FIG. 7
shows an elevation mechanism of the left and right microphones. FIG. 7A is a front view showing
the elevating mechanism when the left and right microphones are in the stored state. FIG. 7B is a
front view showing the elevating mechanism when the left and right microphones are in the first
expanded state. FIG. 7C is a side sectional view showing the lifting mechanism when the left and
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right microphones are in the stored state. FIG. 7B is a side cross-sectional view showing the
elevating mechanism when the left and right microphones are in the first expanded state.
[0019]
Hereinafter, a video recorder provided with a stereo recording microphone unit according to an
embodiment of the present invention will be described with reference to the drawings.
[0020]
The present invention is not limited to the configuration of the embodiment described below.
For example, the microphone unit for stereo recording of the present invention is not limited to a
video recorder, and can be applied to an audio recorder and an external microphone. Further, in
the following description, the stereo recording microphone unit is simply referred to as a
"microphone unit".
[0021]
<Overall Configuration of Video Recorder> As shown in FIGS. 1 (a) to 1 (d), the video recorder
100 of the present embodiment has a compact case 101 that fits in one hand. In front of the
housing 101, a lens 102 for capturing an image is provided. The display unit 103 configured to
have a variable angle is attached to the right side surface of the housing 101. An operation unit
104 is provided on the top surface of the housing 101. The operation unit 104 includes, for
example, a power switch 104a, a recording switch 104b, and an input volume dial 104c. A
plurality of terminal holes are disposed on the back of the housing 101. As a terminal hole
required for the video recorder 100, the HDMI terminal hole 105a, the USB terminal hole 105b,
the external input terminal hole 105c, and the headphone terminal hole 105d are exemplified.
[0022]
Behind the housing 101, the microphone unit 1 of the present embodiment is provided. The
microphone unit 1 includes a left microphone 10 and a right microphone 20. Fronts of the left
and right microphones 10 and 20 are sound collecting surfaces 10A and 20A in which a large
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number of holes are formed. In addition, inside the microphone unit 1, a retracting mechanism
30 and an elevating mechanism 40 (see FIGS. 6 and 7) which will be described later are provided.
The left and right microphones 10 and 20 are configured to be able to protrude and retract with
respect to the upper surface of the housing 101 by the retracting mechanism 30 and the
elevating mechanism 40. That is, the left and right microphones 10 and 20 are in the stored state
or the expanded state with respect to the upper surface of the housing 101.
[0023]
Here, the terms “stored state” and “deployed state” in the present embodiment are defined
based on the top surface of the housing 101. The stored state means the state when the vertical
position of the left and right microphones 10 and 20 is on the top surface of the housing 101. On
the other hand, the unfolded state means the state when the vertical position of the left and right
microphones 10 and 20 is above the upper surface of the housing 101. The upper surface of the
housing 101 includes concave portions 101a and 101a described later. The microphone unit 1
according to the present embodiment can set the left and right microphones 10 and 20 in three
modes: a storage state, a first expanded state, and a second expanded state.
[0024]
<Storage Condition> FIGS. 1A to 1D show the storage condition of the left and right microphones
10 and 20. FIG. The left and right microphones 10, 20 of the present embodiment are arranged
in a V shape in the stored state. The left and right microphones 10, 20 arranged in a V-shape
have an angle between their respective sound collection axes of about 60 to 120 degrees. Here,
the “sound collecting axis” generally means a virtual axis extending in the direction
perpendicular to the surface of the diaphragm incorporated in the microphone. The diaphragm
receives sound and vibrates, and transmits this vibration to the electrical conversion system. The
sound collection axis AX of the left and right microphones 10 and 20 is shown in FIGS. Inside the
left and right microphones 10 and 20, microphone capsules 12 and 21 described later are
provided. Each of the microphone capsules 12 and 21 includes a diaphragm (not shown). A
virtual axis extending perpendicularly from the surface of the diaphragm is the sound collection
axis AX1.
[0025]
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On the upper surface of the housing 101 of the present embodiment, two concave portions 101a
and 101a corresponding to the shapes of the left and right microphones 10 and 20 arranged in a
V shape are formed. The left and right microphones 10 and 20 are accommodated in the two
concave portions 101 a and 101 a on the upper surface of the housing 101 when the
accommodated state is obtained.
[0026]
<First Expanded State> The microphone unit 1 of the present embodiment is provided with a lift
mechanism 40 described later. The elevating mechanism 40 is configured to vertically move both
the left and right microphones 10 and 20 together. On the back plate 105 of the housing 101
shown in FIG. 1D, a slide groove 41 which is a component of a part of the elevation mechanism
40 and a slider 42 are provided. The slider 42 can move up and down along the slide groove 42.
The linear motion when the slider 42 is moved is transmitted to both the left and right
microphones 10 and 20.
[0027]
When the slider 42 shown in FIG. 1 (d) is moved upward along the slide groove 41, the left and
right microphones 10, 20 are in the first unfolded state shown in FIGS. 2 (a) to 2 (d). The left and
right microphones 10 and 20 of the present embodiment are placed in the V-shaped state, and
are in the first expanded state from the stored state. The left and right microphones 10 and 20
are respectively coupled to the left and right shafts 31 and 32 that constitute the advancing and
retracting mechanism 30. The left and right shafts 31, 32 are arranged in parallel in the vertical
direction. The left and right shafts 31, 32 are configured to be rotatable about an axis extending
in the longitudinal direction. The left and right microphones 10, 20 can rotate in the horizontal
direction together with the left and right shafts 31, 32.
[0028]
<Second Expanded State> As described above, the microphone unit 1 of the present embodiment
is provided with the projecting / retracting mechanism 30 described later. The advancing and
retracting mechanism 30 is configured to convert the rotational motion of the left and right
shafts 31, 32 into a linear motion. The advancing and retracting mechanism 30 moves the left
and right shafts 31, 32 in the vertical direction when the left and right shafts 31, 32 are rotated
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in the horizontal direction. With such a configuration, the left and right microphones 10, 20
coupled to the left and right shafts 31, 32, respectively, move in the vertical direction when
rotated in the horizontal direction. Furthermore, when the horizontal angle of the left and right
microphones 10 and 20 becomes an angle at which the sound collection axes AX1 intersect with
each other, the in / out mechanism 30 of the present embodiment Configured to be different.
[0029]
In the first unfolded state shown in FIGS. 2 (a) to 2 (d), the left and right microphones 10, 20 are
rotated in the horizontal direction and arranged in an inverted V shape, as shown in FIGS. It will
be in the second expanded state shown. When the left and right microphones 10, 20 are
arranged in an inverted V shape, the sound collection axes AX1 intersect with each other at a
predetermined angle. The intersection angle of each sound collection axis AX1 is, for example, in
the range of about 90 to 135 degrees. Furthermore, in the second unfolded state, the left and
right microphones 10, 20 are arranged such that the front side portions thereof overlap in the
vertical direction. At this time, the respective sound collecting surfaces 10A and 20A of the left
and right microphones 10 and 20 intersect on the same axis in the vertical direction (see the axis
AX2 in FIG. 4). As a result, when the left and right microphones 10 and 20 are in the second
expanded state, all the conditions relating to the arrangement necessary for the true XY method
are satisfied.
[0030]
FIG. 4 shows the left and right microphones 10 and 20 in the storage state, the first unfolded
state, and the second unfolded state. Hereinafter, assuming that the diameters of the left and
right microphones 10 and 20 shown in FIG. 4 are “R”, the operation of the left and right
microphones 10 and 20 will be described. The movement amounts of the left and right
microphones 10 and 20 shown using “R” in FIG. 4 are merely examples for the purpose of
explanation. The microphone unit of the present invention is not limited to the amount of
movement illustrated in FIG.
[0031]
The switching between the storage state and the first expanded state is performed by an
elevating mechanism 40 described later. The lifting mechanism 40 moves the left and right
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microphones 10 and 20 together up and down. As shown in FIG. 4, both the left and right
microphones 10 and 20 move an amount of 2R upward when entering the first expanded state
from the stored state. The lifting mechanism 40 does not change the horizontal angle of the left
and right microphones 10 and 20. Therefore, the left and right microphones 10 and 20 are
placed in the first expanded state from the stored state while being arranged in the V shape.
Contrary to the above, both of the left and right microphones 10 and 20 move downward by 2R
respectively when they enter the storage state from the first expanded state.
[0032]
Next, switching between the first unfolded state and the second unfolded state is performed by
the retracting mechanism 30 described later. The advancing and retracting mechanism 30 moves
the left and right microphones 10 and 20 individually according to the horizontal angle of the
left and right microphones 10 and 20. As shown in FIG. 4, the left microphone 10 moves
downward by an amount of 1 / 2R when the first expanded state is changed to the second
expanded state. On the other hand, the right microphone 20 moves an amount of 1 / 2R upward
when changing from the first expanded state to the second expanded state. Thereby, the left and
right microphones 10, 20 are arranged in an inverted V shape at positions which differ in the
vertical direction by the amount of R. At this time, the respective sound collecting surfaces 10A
and 20A intersect on the same axis line AX2 in the vertical direction. Although not shown in FIG.
4, in fact, a minute clearance is secured between the left and right microphones 10 and 20 in the
second expanded state.
[0033]
<Left and Right Microphones> As shown in FIGS. 5A and 5B, the left and right microphones 10
and 20 of this embodiment have the same configuration. The left and right microphones 10 and
20 have cylindrical cases 11 and 21, respectively. In the cases 11 and 21, unidirectional
microphone capsules 12 and 22 are accommodated. As described above, the fronts of the cases
11 and 21 are the sound collecting surfaces 10A and 20A in which a large number of holes are
formed.
[0034]
The microphone capsules 12, 22 are disposed behind the sound collecting surfaces 10A, 20A. A
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diaphragm and a field effect transistor (FET) not shown are accommodated in the microphone
capsules 12 and 22. A diaphragm is disposed in front of the microphone capsules 12 and 22. On
the back surface of the microphone capsule 12, 22, three electrodes corresponding to the source,
drain and GND of the FET are provided. Here, the microphone capsules 12 and 22 of the present
embodiment employ a three-wire system excellent in sound quality. Therefore, lead wires 13 and
23 are connected to the three electrodes of the FET, respectively. The lead wires 13 and 23 pass
through the left and right shafts 31 and 32 and are connected to left and right audio input units
(not shown) of the video recorder 100.
[0035]
The diaphragms of the microphone capsules 12 and 22 vibrate in response to the sound passing
through the sound collecting surfaces 10A and 20A. The vibration of the diaphragm is converted
into an electrical signal by the FET, and is input to the left and right audio input units of the video
recorder 100 through the lead wires 13 and 23 of the source.
[0036]
The retracting mechanism 30 of this embodiment is shown in FIGS. 5 (a), 5 (b) and 6 (a)-(d). The
retracting mechanism 30 includes left and right shafts 31, 32, four guide protrusions 31a, 32a,
two shaft covers 33, and four guide grooves 33a in order to vertically move the left and right
microphones 10, 20 individually. .
[0037]
In FIGS. 5A and 5B, the left and right shafts 31, 32 are both made of metal pipes. Below the
center of the side surface of the left shaft 31, two guide protrusions 31a, 31a are provided. The
guide protrusions 31a, 31a of the present embodiment are constituted by both end portions of
one metal pin. The metal pin penetrates the side surface of the left shaft 31 horizontally.
Therefore, the two guide protrusions 31 a, 31 a are provided at the same position in the vertical
direction on the side surface of the left shaft 31. Similarly, two guide protrusions 32a and 32a
are provided below the side surface of the right shaft 32. The guide protrusions 32a, 32a are also
constituted by both ends of one metal pin which penetrates the side surface of the right shaft 32
horizontally.
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[0038]
Here, the positions of the left and right guide protrusions 31a, 32a in the vertical direction are
different from each other. According to the example of FIG. 4, the positions of the left and right
guide protrusions 31a, 32a differ from each other by an amount of 1 / 2R in the vertical
direction.
[0039]
As shown in FIG. 6A, of the side surfaces of the left and right shafts 31, 32, the portions provided
with the guide protrusions 31a, 32a are covered by the shaft covers 33, 33. The left and right
shaft covers 33, 33 have exactly the same configuration.
[0040]
The shaft cover 33 is constituted by a cylindrical wall portion larger in diameter than the left and
right shafts 31, 32. A pair of guide grooves 33a, 33a are provided opposite to each other in this
wall portion. The pair of guide grooves 33a, 33a have exactly the same shape. The main part of
the guide groove 33a is an inclined groove extending vertically along the cylindrical wall. The
upper and lower ends of the inclined groove respectively continue to the horizontally extending
short groove. According to the example of FIG. 4, the upper end and the lower end of the guide
groove 33a have a height difference of an amount of 1 / 2R in the vertical direction.
[0041]
Two guide protrusions 31a, 31a or 32a, 32a are engaged with the pair of guide grooves 33a,
33a, respectively. Further, the shaft cover 33 is fixed to the elevating mechanism 40 to be
described later by the connecting convex portion 33 b provided on the wall portion. With such a
configuration, the guide protrusions 31a and 32a move vertically along the guide grooves 33a as
the left and right shafts 31 and 32 rotate. That is, the rotational movement of the left and right
shafts 31, 32 is converted into linear movement in the vertical direction.
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[0042]
Here, FIG. 6A shows the storage state and the first expanded state described above, that is, the
state when the left and right microphones 10 and 20 are arranged in a V shape. The left and
right microphones 10, 20 are switched from V-shaped to inverted V-shaped arrangement
according to the configuration described below.
[0043]
In FIG. 6A, the guide protrusion 31a of the left shaft 31 is located at the upper end of the guide
groove 33a. Therefore, the left shaft 31 can rotate only clockwise in the figure according to the
guide groove 33a. The left shaft 31 rotated clockwise moves downward by an amount 1 / 2R
which is the height difference of the guide groove 33a.
[0044]
On the other hand, in FIG. 6A, the guide protrusion 32a of the right shaft 32 is located at the
lower end of the guide groove 33a. Therefore, the right shaft 32 can rotate only
counterclockwise in the figure. The counterclockwise rotated right shaft 32 moves upward by an
amount of 1 / 2R which is the height difference of the guide groove 33a.
[0045]
According to the above-described configuration, the left and right microphones 10, 20 are
arranged in an inverted V shape at positions different by an amount of R in the vertical direction
(see FIG. 4B).
[0046]
Here, as shown in FIGS. 6B to 6D, the projection / retraction mechanism 30 of the present
embodiment includes left and right switches 34 for detecting the arrangement of the left and
right microphones 10 and 20.
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The left and right switches 34 have exactly the same configuration, but the arrangement of the
shaft cover 33 with respect to the guide groove 33a is different. The switch 34 corresponding to
the left shaft 31 is disposed near the lower end of the guide groove 33a. The switch 34
corresponding to the right shaft 32 is disposed near the upper end of the guide groove 33a.
When the left and right microphones 10, 20 are arranged in an inverted V shape, the left and
right guide protrusions 31a, 32a turn on the two switches 34, 34 (see FIG. 6 (d)).
[0047]
The arithmetic processing unit incorporated in the video recorder 100 switches the left and right
audio inputs of the left and right microphones 10, 20 when both of the two switches 34, 34 are
turned on. That is, when the left and right microphones 10 and 20 are arranged in an inverted V
shape, the processing unit processes the signal from the left microphone 10 as a right voice
input, and the signal from the right microphone 20 is left voice. Treat as input.
[0048]
Lifting Mechanism The microphone unit 1 of the present embodiment includes the lifting
mechanism 40 shown in FIGS. 7 (a) to 7 (d). The lift mechanism 40 includes a slide groove 41, a
slider 42 and a lift plate 43. The components of the elevating mechanism 10 are provided on the
back plate 105 of the housing 101.
[0049]
The slide groove 41 is a linear groove formed in the vertical direction of the back plate 105. The
slider 42 is slidably attached to the slide groove 41 from the front side of the back plate 105. The
slider 42 is coupled to a lift plate 43 disposed on the back side of the back plate 105. The lift
plate 43 has a pair of connection recesses 43a and 43a. The connecting convex portions 33b,
33b of the two shaft covers 33, 33 constituting the projecting and retracting mechanism 30 are
fixed to the connecting concave portions 43a, 43a.
[0050]
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According to the example of FIG. 4, the slide groove 41 has a length obtained by adding 2R to the
vertical length of the slider 42. The slider 42 can move up and down by 2R along the slide
groove 41. The lift plate 43 moves an amount of 2R in the vertical direction along with the
movement of the slider 42. The left and right shafts 31, 32 attached to the elevating plate 43
also move by 2R in the vertical direction as the slider 42 moves. The elevating mechanism 40
having such a configuration makes it possible to switch the left and right microphones 10 and 20
to the stored state or the first expanded state.
[0051]
<Technical effect> The microphone unit 1 of the present embodiment described above exhibits
the following technical effects.
[0052]
First, the retracting mechanism 30 enables the left and right microphones 10 and 20 to be
switched between an inverted V-shaped arrangement as a true XY method and a V-shaped
arrangement.
That is, when the left and right microphones 10, 20 are arranged in an inverted V shape, the
projecting / retracting mechanism 30 makes the positions of the left and right microphones 10,
20 different in the vertical direction. At this time, portions on the front side of the left and right
microphones 10 and 20 are disposed to overlap in the vertical direction, and the respective
sound collecting surfaces 10A and 20A intersect on the same axial line AX2 in the vertical
direction. Thereby, the arrangement of the left and right microphones 10 and 20 becomes a true
XY method. On the other hand, when the left and right microphones 10, 20 are arranged in a Vshape, the projecting and retracting mechanism 30 makes the positions of the left and right
microphones 10, 20 in the vertical direction the same. Thus, the microphone unit 1 of the
present embodiment can establish both the V-shaped arrangement and the V-shaped
arrangement as the true XY method.
[0053]
Second, the left and right microphones 10, 20 provide high recording quality when in a true XY
arrangement. That is, when the left and right microphones 10, 20 are arranged in an inverted V
shape, the positions in the vertical direction are different, and the respective sound collecting
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surfaces 10A, 20A intersect on the same axis AX2 in the vertical direction. Thereby, the
arrangement relationship of the recorded sound is expressed in the perspective direction in
addition to the lateral direction. Moreover, it becomes possible to record the sound from the
front favorably.
[0054]
Third, the left and right microphones 10 and 20 provide good recording quality even when
stored in the housing 101. That is, the left and right microphones 10 and 20 are arranged in the
true XY system when expanded from the housing 101. On the other hand, the left and right
microphones 10 and 20 are arranged in a V shape when housed in the housing 101. Thus, the
left and right microphones 10, 20 provide good recording quality based on different schemes in
both the stowed and deployed states.
[0055]
In addition, the microphone unit of this invention is not limited to embodiment mentioned above,
The change of various structures is possible. For example, the arrangement of the left and right
microphones in the stored state is not limited to the V-shaped arrangement. For example, the left
and right microphones may be arranged in parallel in the stored state. Further, the retracting
mechanism and the lifting mechanism are not limited to the configurations shown in the
drawings. Furthermore, the microphone unit of the present invention is not limited to a video
recorder, and can be applied to, for example, an audio recorder or an external microphone.
[0056]
DESCRIPTION OF SYMBOLS 1 Microphone unit 10 Left microphone 20 Right microphone 10A,
20A Sound collection surface 11, 21 Case 12, 22 Microphone capsule 13, 23 Signal line 30
Ejection and retraction mechanism 31 Left shaft 32 Right shaft 31a, 32a Guide projection 33
Shaft cover 33a Guide groove 33b Connecting projection 34 Switch 40 Lifting mechanism 41
Slide groove 42 Slider 43 Lifting plate 43a Connecting recess 100 Video recorder 101 Housing
101a Recess 102 Lens 103 Display 104 Operation unit 104a Power switch 104b Recording
switch 104c Input volume dial 105 Back plate 105a: HDMI terminal hole 105b: USB terminal
hole 105c: external input terminal hole 105d: headphone terminal hole AX1: sound collecting
axis AX2: vertical axis
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