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JP2017077024

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DESCRIPTION JP2017077024
Abstract: To provide a speaker box and a microphone stand that can reduce the number of
connection cords of equipment installed on a stage. A speaker box 20 according to the present
embodiment is attached to a root side of a pole 3 of a microphone stand 2 holding a microphone
11. Further, the microphone stand 2 according to the present embodiment has the speaker box
20 on the root side of the pole 3. Thus, the microphone cord 13 extending from the microphone
11 is connected directly to the amplifier unit provided inside the speaker box 20 along the pole
3. Therefore, the microphone cord 13 is not laid on the floor surface 100 of the stage. Therefore,
it is possible to reduce the number of connection cords of equipment installed on the stage.
[Selected figure] Figure 1
スピーカボックスおよびマイクロホンスタンド
[0001]
The present invention relates to a speaker box including a speaker and an audio amplifier for
amplifying an audio signal input from a microphone and outputting the amplified signal to the
speaker, and a microphone stand including such a speaker box.
[0002]
Equipment used by a musician for live performances includes a microphone, a microphone stand,
and a speaker with an amplifier.
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1
These are used, for example, arranged on a stage as disclosed in Patent Document 1 below
(Patent Document 1; FIG. 1). In the example of this figure, the microphone stand and the speaker
with an amplifier are placed on the stage, and the microphone and the cord extended from the
electric guitar are connected to the speaker with the amplifier. Besides these, a music stand, an
audio equalizer, etc. may be placed on the stage. The microphone stand also has a tripod type as
disclosed in Patent Document 2 below.
[0003]
JP, 2002-135875, A JP, 2000-78677, A
[0004]
As described above, in live performances and the like, various pieces of equipment are placed on
the stage, and a plurality of connection cords such as microphone cords are often connected to a
speaker with an amplifier, an audio equalizer, and the like.
Therefore, on the floor of the stage being played, a number of connection cords are laid. If these
cords get tangled together or get stuck on the musician's feet, they can be a distraction to the
performance. In addition, when the stage is narrow, there may not be enough area to arrange all
the devices such as the microphone stand and the speaker with amplifier. In such a case, for
example, when both the microphone stand and the music stand are of the tripod type, if the two
are too close to each other, the legs may cross each other and either may fall.
[0005]
The present invention has been made to solve the above-mentioned problems, and it is an object
of the present invention to provide a speaker box and a microphone stand which can reduce the
number of connection cords of equipment laid on a stage.
[0006]
In order to achieve the above object, the technical means of claim 1 described in the claims is
adopted.
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2
According to this means, the speaker box of the present invention is attached to the root side of
the pole of the microphone stand that holds the microphone. Thereby, the microphone cord
extending from the microphone is connected directly to the audio amplifier of the speaker box
along the pole. Therefore, the microphone cord is not laid on the floor of the stage. The pole
corresponds to, for example, a column that stands up substantially perpendicularly to the floor
surface of the stage when the microphone stand is in use. The "voice signal" described in the
claims is, for example, an analog electrical signal having a frequency band of 30 Hz to 30 KHz,
and includes sounds other than human voices (the same applies hereinafter).
[0007]
Moreover, the technical means of Claim 2 as described in the claim is employ | adopted.
According to this means, the speaker box of the present invention is provided with openings or
speakers at a plurality of places where the speaker sound is output to the outside. And the
speaker sound emitted from at least one of these openings or speakers reaches the user of the
microphone. As a result, from the remaining openings or speakers, a speaker sound is emitted in
a direction toward the audience or the like. Therefore, it is not necessary to separately provide a
speaker for the audience.
[0008]
Moreover, the technical means of Claim 3 as described in the claim is employ | adopted.
According to this means, the speaker box of the present invention has a plurality of openings or a
plurality of speakers on the side wall, and plays the role of a stand base for supporting the pole.
Thus, the speaker box functions so that the speaker sound can be emitted from the stand base to
the user of the microphone, the audience, and the like.
[0009]
Moreover, the technical means of Claim 4 as described in the claim is employ | adopted.
According to this means, in the speaker box of the present invention, the fixing portion and the
rotation mechanism for rotatably attaching the plurality of side walls to the fixing portion are
provided on the plurality of side walls which are radially split from the pole. , And the
deployment angles of the plurality of side walls change according to the fixed position of the
fixed portion to change the orientation of the opening or the speaker. This allows the opening or
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the speaker to be turned as far as possible.
[0010]
In addition, the technical means of claim 5 described in the claims is adopted. According to this
means, when removed from the pole, the speaker box of the present invention can deploy the
side walls in a planar manner. Thereby, since it becomes flat form from box shape, the width |
variety of the flat form thickness direction is narrowed.
[0011]
In order to achieve the above object, the technical means of claim 6 described in the claims is
adopted. According to this means, the microphone stand of the present invention comprises the
above speaker box on the root side of the pole. Thereby, the features of each of the above
speaker boxes are provided.
[0012]
In the invention of claim 1, the microphone cord extending from the microphone is directly
connected to the audio amplifier of the speaker box along the pole, so the microphone cord is not
laid on the floor of the stage. Therefore, it is possible to reduce the number of connection cords
of the device laid on the stage.
[0013]
According to the second aspect of the invention, the number of necessary equipment and the like
is reduced because the separate speaker for the audience and the connection cord therefor are
reduced. Therefore, the number of connection cords of the equipment to be laid on the stage can
be further reduced, and the required area of the equipment to be arranged on the stage can also
be reduced.
[0014]
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4
According to the invention of claim 3, since it plays the role of a stand base supporting a pole,
even a microphone stand without legs (a Freddie Mercury style microphone stand) can be made
to stand alone, and from the stand base, the microphone The speaker sound can be emitted to
the users of the The Freddie Mercury style microphone stand is a legless microphone stand used
extensively by British musician Freddie Mercury (same below).
[0015]
In the invention of claim 4, since the direction of the opening or the speaker can be changed
within the possible range, for example, the direction of the opening or the speaker is changed so
that the howling that the speaker sound can get around to the microphone does not occur. Can.
In addition, the direction of the opening or the speaker can be changed in the direction in which
the speaker sound easily reaches the user of the microphone, the audience, or the like.
[0016]
In the invention of claim 5, when it is removed from the pole and expanded, the box shape is
changed to a flat shape (flat shape), so the width in the thickness direction of the flat shape is
narrowed. For example, since it can be accommodated in the gap space formed near the side wall
or the ceiling of the transport vehicle, portability is enhanced compared to the case of the box
shape. In addition, it is excellent in convenience.
[0017]
In the invention of claim 6, since the above speaker box is provided on the root side of the pole, it
is possible to provide a microphone stand provided with the features of each of the above
speaker boxes.
[0018]
It is an explanatory view showing an example of use of a speaker box concerning a 1st
embodiment of the present invention.
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It is an external view which shows the mechanical structural example of the speaker box of 1st
Embodiment. It is a block diagram showing an example of electric composition of a speaker box
of a 1st embodiment. It is an external view which shows the modification of the speaker box of
1st Embodiment. It is an external view which shows the mechanical structural example of the
speaker box which concerns on 2nd Embodiment of this invention. It is explanatory drawing
which shows the expansion example of the side panel which comprises the speaker box of 2nd
Embodiment. It is explanatory drawing which shows the example of the procedure of attaching
the speaker box of 2nd Embodiment to a microphone stand. It is explanatory drawing which
shows the example which expand | deployed the speaker box of 2nd Embodiment in flat plate
shape.
[0019]
Hereinafter, each embodiment of the speaker box of the present invention will be described with
reference to the drawings. (First Embodiment) First, as a first embodiment of the speaker box of
the present invention, a stand base type speaker box 20, 40 will be described with reference to
FIGS. FIG. 1 is an explanatory view showing a usage example of the speaker box 20. As shown in
FIG. FIG. 2 is an external view showing a mechanical structural example of the speaker box 20,
and FIG. 3 is a block diagram showing an electrical structural example of the speaker box 20. As
shown in FIG. FIG. 4 is an external view of the speaker box 40 as a modified example of the first
embodiment. FIG. 2A corresponds to a side view seen from the direction of the arrow 2A shown
in FIG. 2B. Moreover, although the arrow which shows the arrow direction is not shown in figure
by FIG. 4 (B), the figure corresponded to the side view seen from the paper surface downward
direction in the figure is represented by FIG. 4 (A).
[0020]
The speaker box 20 is attached to the root side of the pole 3 of the microphone stand 2 holding
the microphone 11. Therefore, the configuration of the microphone stand 2 will be briefly
described prior to the description of the speaker box 20.
[0021]
As shown in FIG. 1, the microphone stand 2 mainly includes a pole 3 and a boom 4. The pole 3
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corresponds to, for example, a column that stands up substantially perpendicularly to the floor
surface 100 of the stage when the microphone stand 2 is in use. The microphone stand 2 shown
in FIG. 1 is a Freddie Mercury style microphone stand. Therefore, unlike the normal freestanding
microphone stand, the pole 3 is not provided with a leg.
[0022]
A boom 4 is attached to one end of the pole 3 via a boom joint 5. At the tip of the boom 4, the
microphone 11 is held via the microphone bracket 6. The microphone bracket 6 may be directly
attached to one end of the pole 3 without attaching the boom 4. In the first embodiment, the pole
3 is erected on the stage so that the other end side, that is, the root side is directly inserted into
the insertion hole 23 a of the speaker box 20 and stands substantially perpendicularly to the
floor surface 100.
[0023]
As shown in FIG. 1 and FIG. 2, the case 21 of the speaker box 20 according to the first
embodiment has a truncated pyramid shape. The case 21 is made of, for example, plastic, and the
four side panels 22 and the top panel 23 are integrally formed except for the bottom 24.
Openings 22 a are formed in the four side panels 22 corresponding to the side surfaces of the
case 21. The openings 22 a are for emitting the speaker sound output from the speaker housed
in the case 21 to the outside, and are covered by the speaker grill 25 respectively.
[0024]
The four speakers 36, 37, 38, 39 are provided corresponding to the four side panels 22, and are
fixed to the side panels 22 by metal fittings not shown. In the first embodiment, the side panel 22
is formed in a trapezoidal shape (hereinafter, among the upper and lower bases in the trapezoidal
shape, the upper base is referred to as the “upper base” and the lower base is referred to as
“the lower base”. It is called the lower floor. Therefore, while the opening 22a is circular
according to the round shape of the speakers 36 to 39, the speaker grille 25 is designed in a
round corner trapezoid which can cover almost the entire surface leaving the periphery of the
side panel 22. It is done. The speakers do not have to be provided in the opening 22 a of the side
panel 22. For example, one speaker may be attached to the bottom 24 or the like so as to emit a
speaker sound in the direction of the top panel 23. Since the required number of speakers can be
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reduced by this, it can manufacture inexpensively.
[0025]
A top panel 23 is connected to the upper bottom side of the side panel 22. The top panel 23 has
a round corner square shape, and an insertion hole 23a is formed at the center thereof. The
insertion hole 23 a is a hole through which the pole 3 of the microphone stand 2 is inserted.
Therefore, the inner diameter of the insertion hole 23 a is set to be slightly larger than the outer
diameter of the pole 3. The top panel 23 is also formed with holes for attaching an input jack 26,
an output jack 27 and a volume. These are electrically connected to an amplifier unit 31 attached
to the back surface (inner side) of the top panel 23.
[0026]
That is, as shown in FIG. 3, in the speaker box 20, in addition to the four speakers 36 to 39
described above, an amplifier unit 31 and a power supply unit 33 are accommodated. The
amplifier unit 31 is an audio signal amplifier (audio amplifier) that amplifies an audio signal
input from the microphone 11 with a predetermined gain and outputs the amplified signal to the
speakers 36 to 39. A microphone plug 15 is attached to the microphone cord 13 of the
microphone 11. Therefore, by connecting the microphone plug 15 to the input jack 26, it
becomes possible to input an audio signal output from the microphone 11 to the amplifier unit
31. A plurality of input jacks 26 may be provided so that audio signals can be input to the
amplifier unit 31 from other microphones or electric guitars, for example. Although the power
switch of the amplifier unit 31 is not shown, for example, a configuration (a volume with a
switch) interlocking with the operation of the volume 32 may be adopted, or a toggle switch
operable from the outside may be provided to turn on / off the power. .
[0027]
An output jack 27 is connected to the amplifier unit 31 as an output destination other than the
speakers 36 to 39. For example, by connecting to another audio amplifier (PA; power amplifier)
via the output jack 27, the sound of the microphone 11 can be output from other speakers. The
amplifier unit 31 is provided with a volume 32 capable of changing the amplification gain, and
can be operated from the outside by a volume knob 28. Thereby, the magnitude of the speaker
sound output from the speakers 36 to 39 can be adjusted. The amplifier unit 31 is driven by the
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DC power supplied from the power supply unit 33. A power supply cord 34 with an AC plug 35
is connected to the power supply unit 33, and for example, a commercial power supply (AC 100
V) is supplied. Instead of the power supply unit 33, DC power may be supplied to the amplifier
unit 31 from a battery.
[0028]
Such an amplifier unit 31 and a power supply unit 33 are attached to the top panel 23 of the
speaker box 20. In the first embodiment, since the pole 3 penetrates the center of the top panel
23, the amplifier unit 31 and the power supply unit 33 are disposed avoiding the insertion hole
23a through which the pole 3 passes. As shown in FIG. 2, a bottom 24 is connected to the lower
bottom side of the side panel 22, and a weight 29 is provided to the bottom 24. The weight 29 is
a weight that serves as a stand base that supports the pole 3. For example, it is a thick steel plate,
and a recess 29a for holding the pole 3 is formed at the center thereof. That is, a circular recess
29 a having substantially the same diameter as the insertion hole 23 a formed in the top panel
23 is formed at the center of the surface of the weight 29. As a result, the pole 3 inserted into the
insertion hole 23a can be erected substantially perpendicularly to the weight 29, that is, the
bottom 24 (the floor surface 100 of the stage) of the speaker box 20. When a male screw is
screwed on the root side (the other end side) of the pole 3 of the microphone stand 2, a female
screw that can be screwed may be formed in the recess 29 a of the weight 29.
[0029]
By thus configuring the speaker box 20, the other end side of the pole 3 of the microphone stand
2, that is, the root side is inserted into the insertion hole 23a of the speaker box 20 and then
inserted into the recess 29a of the weight 29 When a male screw is screwed on the root side (the
other end side), the microphone stand 2 is supported by the speaker box 20 when it is rotated in
the screw tightening direction after insertion. Further, since the amplifier unit 31 is built in the
speaker box 20 supporting the microphone stand 2, the microphone plug 15 of the microphone
11 held by the microphone stand 2 is connected to the input jack 26 of the speaker box 20. The
equipment such as the microphone stand 2 and the microphone 11 can be set up without laying
the microphone cord 13 on the floor surface 100 of the stage. This makes it possible to reduce
the number of connection cords of the equipment that are laid at the feet of the musician M and
tend to interfere with the performance.
[0030]
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9
Subsequently, a modified example of the first embodiment will be described with reference to
FIG. The speaker box 20 described so far has the case 21 having a quadrangular frustum shape,
but the speaker box 40 of the modified example is different from the speaker box 20 in that the
case 41 has a frustum shape. The speaker box 40 is lower in height and lower in height than the
speaker box 20, and configured to have a disk shape. Therefore, for example, when the musician
M sits on a chair or the like and plays, it can also be a substitute for a footrest. The electrical
configuration is almost the same as that of the speaker box 20. Therefore, the same reference
numerals as shown in FIG. 2 are given to parts having substantially the same configuration, and
the description will be omitted.
[0031]
As shown in FIG. 4, the case 41 of the speaker box 40 is made of, for example, plastic, and the
side panel 42 and the top panel 43 are integrally formed except for the bottom portion 44. A
speaker grill 45 extending in the circumferential direction in the circumferential direction is
attached to an annular side surface panel 42 corresponding to the side surface of the case 41 in
four directions of 90 degrees. Since the case 41 has a low profile, a plurality of small diameter
speakers are arranged with respect to the speaker grill 45 extending in such a band shape. For
example, the speaker 36 is configured by combining three small speakers 36a, 36b, and 36c. The
small speakers 36 a, 36 b and 36 c are individually connected to the amplifier unit 31. The other
small speakers 37 to 39 are similarly configured by combining three small speakers 37a to 37c,
38a to 38c, and 39a to 39c. In the side panel 42 to which the small speakers 36a, 36b, 36c, etc.
are attached, openings corresponding to the shapes of the small speakers are formed, but are
omitted in FIG. Instead of the plurality of small-sized speakers, an oval shaped speaker may be
used according to the band shape of the speaker grill 45.
[0032]
The top panel 43 of the speaker box 40 is formed in a circular shape, and the pole 3 has an
insertion hole 43a formed at the center thereof. The insertion hole 43 a is a hole through which
the pole 3 of the microphone stand 2 is inserted. Similarly to the insertion hole 23 a of the
speaker box 20, the insertion hole 43 a is also set to have an inner diameter slightly larger than
the outer diameter of the pole 3. Of the surface of the top panel 43, the holes for attaching the
input jack 26, the output jack 27 and the volume are formed in a line on the semicircular side
where the amplifier unit 31 is provided on the back side. On the other hand, the remaining
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semicircular side of the top panel 43, that is, the surface of the top panel 43 on the semicircular
side on which the power supply unit 33 is provided on the back side is flat without providing the
input jack 26 and the like. It remains. Therefore, the flat surface side of such a top panel 43 can
function as a footrest of a musician M who sits on a chair or the like and plays.
[0033]
The amplifier unit 31 and the power supply unit 33 housed in the speaker box 40 are thinner
than the speaker box 20 in order to be housed in the low-profile speaker box 40. Further, like the
weight 29 of the speaker box 20, a circular recess 49a having substantially the same diameter as
the insertion hole 43a formed in the top panel 43 is formed at the center of the disk shaped
weight 49 supporting the pole 3 There is.
[0034]
By thus configuring the speaker box 40 in a disk shape, it is possible to use equipment such as
the microphone stand 2 and the microphone 11 without laying the microphone cord 13 of the
microphone 11 held by the microphone stand 2 on the floor surface 100 of the stage. In addition
to being able to set up, it also replaces the musician M's footrest. In addition, since it has a disk
shape and a low height, it is easier to carry as compared with the above-described squarepyramidal speaker box 20. Therefore, the speaker box 40 is excellent in portability.
[0035]
As described above, the speaker boxes 20 and 40 according to the first embodiment are attached
to the root side of the pole 3 of the microphone stand 2 holding the microphone 11. As a result,
the microphone cord 13 extending from the microphone 11 is directly connected to the amplifier
unit 31 of the speaker boxes 20 and 40 along the pole 3. Therefore, the microphone cord 13 is
not laid on the floor surface 100 of the stage. Therefore, it is possible to reduce the number of
connection cords of the device laid on the stage.
[0036]
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In the speaker boxes 20 and 40 according to the first embodiment, the openings 22a and 42a (or
the speakers 36 to 39) for outputting the speaker sound to the outside are provided at a plurality
of places. Then, the speaker sound emitted from at least one of the openings 22a and 42a (or the
speakers 36 to 39) (the openings 22a and 42a and the speaker 36) reaches the musician M who
uses the microphone 11. As a result, from the remaining openings 22a and 42a (or the speakers
37 to 39), a speaker sound is emitted in a direction toward the audience or the like. Therefore,
since it is not necessary to separately provide a speaker for the audience, another speaker for the
audience and a connection cord therefor can be reduced. Therefore, since the number of
necessary equipment etc. is reduced, the number of connection cords laid on the stage can be
further reduced, and the required area of the equipment arranged on the stage can also be
reduced.
[0037]
Furthermore, in the speaker boxes 20 and 40 of the first embodiment, weights 29 and 49 are
provided at the bottoms 24 and 44, and the pole 3 of the microphone stand 2 is supported by the
concave portions 29a and 49a formed thereon. Thereby, since it plays a role of a stand base,
even a Freddie Mercury style microphone stand without legs can be made to stand alone.
[0038]
Second Embodiment Next, a second embodiment of the speaker box according to the present
invention will be described with reference to FIGS. The speaker box 50 of the second
embodiment is a portable and convenient speaker box 50 of an expandable type. FIG. 5 is an
external view showing an example of a mechanical configuration of the speaker box 50
according to the second embodiment. 6 is an explanatory view showing a development example
of the speaker box 50, and FIG. 7 is an explanatory view showing an example of a procedure for
attaching the speaker box 50 to the microphone stand 2. As shown in FIG. FIG. 8 is an
explanatory view showing an example in which the speaker box 50 is developed in a flat plate
shape. Although the arrow which shows arrow direction is not shown in figure by FIG. 5 (B), the
figure corresponded to the side view seen from the paper surface lower direction in the same
figure is represented by FIG. 5 (A). Moreover, although the arrow which shows an arrow direction
is not shown in figure by FIG. 8 (A), the figure corresponded to the side view seen from the paper
surface downward direction in the figure is represented by FIG. 8 (B).
[0039]
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The speaker box 50 of the second embodiment adopts a configuration corresponding to one
obtained by dividing the side panel 22 constituting the speaker box 20 of the first embodiment
into four and removing the bottom portion 44. Thus, the pole 3 is inserted through the one end
side of the pole 3 to which the boom joint 5 and the microphone bracket 6 are attached to the
microphone stand with the legs attached, and the leg shaft 8 of the leg of the microphone stand
It will be possible to put it on top and use it. The attachment procedure to the microphone stand
will be described later with reference to FIG. The electrical configuration of the speaker box 50 of
the second embodiment is substantially the same as that of the speaker box 20. Therefore, the
same reference numerals as shown in FIG. 2 are given to parts having substantially the same
configuration, and the description will be omitted.
[0040]
First, the configuration and the like of the speaker box 50 will be described based on FIGS. 5 and
6. As shown in FIG. 5, in the speaker box 50 of the second embodiment, the case 51 is
constituted by four side panels 52 and one top panel 53. Similarly to the case 21 of the speaker
box 20 described above, the case 51 is also made of, for example, plastic. The side panel 52 is
formed in a trapezoidal shape, and the upper bottom of each side panel is rotatably connected to
each side of the top panel 53 formed in a square shape. A pivoting mechanism for realizing
pivoting of each side panel 52 is, for example, a hinge (butterfly hinge) 59. For example, the four
side panels 52 and the top panel 53 may be integrally formed of a highly flexible resin material
to form the portion of the butterfly hinge in a flexible hinge shape. In FIGS. 5, 6 and 8, the
portion corresponding to the hinge 59 is colored in gray.
[0041]
Similar to the top panel 23 of the speaker box 20, the top panel 53 is formed at its center with an
insertion hole 53a through which the pole 3 of the microphone stand can be inserted. A holder
ring 56 is mounted coaxially with the insertion hole 53a of the top panel 53 on the surface of the
top panel 53, that is, the outer surface of the top panel 53 to which the amplifier unit 31 and the
power supply unit 33 are not attached. The holder ring 56 is a fixing portion for fixing the
speaker box 50 to the pole 3. Therefore, the holder ring 56 is formed with an insertion hole 56 a
having substantially the same diameter or a slightly larger diameter than the insertion hole 53 a
of the top panel 53, and from the radial direction with respect to the pole 3 penetrating the
holder ring 56. Bolts 57 for pressure welding are provided at three locations. For example, three
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bolts 57 which press against the pole 3 when turned in the screw tightening direction are
provided at intervals of 120 degrees in the circumferential direction of the holder ring 56. In
addition, since the speakers 36 to 39 and the speaker grill 55 are the same as the speakers 36 to
39 and the speaker grill 25 of the speaker box 20, the description will be omitted.
[0042]
By configuring the speaker box 50 in this manner, the unfolded state of the side panel 52
changes at the position of the holder ring 56 fixed to the pole 3. That is, as shown in FIG. 5A and
FIG. 6, the four side panels 52 are placed on the floor surface 100 as the position of the holder
ring 56 moves away from the legs of the pole 3 (the leg holder 7 and the leg shaft 8). (The
expansion angle θ is small) (the example in FIG. 5A), the four side panels 52 become the floor as
the position of the holder ring 56 approaches the leg of the pole 3 It becomes a state of lying on
the surface 100 (a state in which the expansion angle θ is large) (example in FIG. 6B). That is,
the expansion angle θ of the four side panels 52 fluctuates according to the fixed position of the
holder ring 56, and the orientation of the opening 52a or the speakers 36 to 39 changes.
Thereby, for example, when the speaker sound output from the speaker box 50 wraps around to
the microphone 11 and howling occurs, the direction of the speakers 36 to 39, etc. is generated
by changing the fixed position of the holder ring 56. It becomes possible to change in the no
direction.
[0043]
Such a speaker box 50 is attached to a microphone stand with legs in the following procedure. As
shown in FIG. 7, after the boom joint 5 is removed from the pole 3 of the microphone stand (or
before the boom joint 5 is attached), the speaker box 50 is covered from the one end 3a of the
pole 3 and holder ring The pole 3 is passed through the 56 insertion holes 56a (speaker box 50
'). Then, the speaker box 50 is placed on the three leg shafts 8 so as to cover the leg holder 7
provided on the other end side of the pole 3. (スピーカボックス50”)。
[0044]
Thereby, the speaker box 50 is attached to the microphone stand with legs. Thereafter, the boom
joint 5 is attached to one end 3a of the pole 3 and the boom 4 is set to a required angle and
length. In the case where the pole 3 is configured to be extendable and retractable by a
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combination of two or more subpoles, the pole 3 is provided from one end side of the subpole
closest to the leg (the end side where the leg holder 7 is not provided). In the same manner as in
the above case, the sub-pole is passed through the insertion hole 56a of the holder ring 56 with
the speaker box 50 covered (the procedure thereafter is the same as above).
[0045]
Further, such a speaker box 50 is in a flat state as shown in FIG. 8 in a state of being removed
from the microphone stand. Therefore, for example, a stopper mechanism capable of maintaining
such an expanded state is provided (added) to the hinge 59, or the speaker box 50 in the
expanded state is a flat two boards (a veneer board, an acrylic board, etc. By sandwiching like a
sandwich, it is possible to carry it like a flat board.
[0046]
The side panel 52 described above is formed in a trapezoidal shape (upper base <lower base) in
which the lower base is larger than the upper base. Therefore, when the holder ring 56 is fixed to
the pole 3 at a position away from the legs of the microphone stand (for example, a position
where the lower bottom (bottom side) of the side panel 52 is separated without contacting the
leg shaft 8) Even if the side panel 52 faces the one end side 3 a of the pole 3, that is, the direction
of the microphone 11. On the other hand, by forming the side panel 52 in a trapezoidal shape
upside down (upper base> lower base), the side panel 52 in the direction of the other end side
(leg side) of the pole 3, that is, the floor surface 100. It becomes possible to turn. This can further
enhance the howling suppression effect.
[0047]
As described above, in the speaker box 50 according to the second embodiment, the top panel
53, the holder ring 56, and the plurality of side panels 52 that are radially expanded from the
pole 3 of the microphone stand 2 And a hinge 59 for pivotably attaching the plurality of side
panels 52 to the top panel 53 and the holder ring 56. Thereby, the expansion angle θ of the
plurality of side panels 52 changes according to the fixed position of the holder ring 56 to
change the direction of the opening 52a or the speakers 36 to 39, and thus the opening 52a or
the speakers 36 to 39 is possible. You can change the direction of Therefore, in addition to being
able to reduce the number of connection cords of the device laid on the stage, for example, the
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opening 52a or the speaker 36 to so that a howling that may occur can be generated by the
speaker sound coming into the microphone 11. The direction of 39 can be changed. In addition,
the direction of the opening 52a or the speakers 36 to 39 can be changed in the direction in
which the speaker sound easily reaches the musician M who uses the microphone 11, the
audience, or the like.
[0048]
Further, in the speaker box 50 according to the second embodiment, when removed from the
pole 3 of the microphone stand 2, the plurality of side panels 52 can be developed in a planar
shape. Thus, the shape of the speaker box 50 changes from a box shape to a flat plate shape, so
the width in the flat plate thickness direction is narrowed. Therefore, it can be accommodated, for
example, in a clearance space formed near the side wall or ceiling of the transport vehicle. Or you
can carry it like a flat board. Therefore, portability is enhanced compared to the case of the box
shape, and the convenience at the time of portability is improved. In addition, although the case
where the leg shaft 8 has three microphone stands was illustrated and demonstrated, the patent
document 1 (Unexamined-Japanese-Patent No. 2002-135875 mentioned in the column of a
"microphone stand" with four or more leg shafts. The speaker box 50 can be used in the same
manner as described above for the microphone stand having a disk-shaped leg portion as
disclosed in Japanese Patent Application Publication No.
[0049]
In each embodiment described above, the amplifier unit 31 is accommodated in the speaker box
20, 40, 50. However, in addition to this, an equalizer is accommodated, or instead of the
amplifier unit 31, an amplifier unit having an equalizer function is provided. It may be
accommodated. This makes it possible to arbitrarily adjust the frequency characteristics of the
speaker sound output from the speakers 36 to 39. Therefore, only by mechanically changing the
directions of the speakers 36 to 39 as means for suppressing the occurrence of howling. Rather,
howling can be suppressed electrically by the graphic equalizer function.
[0050]
When a plurality of input jacks 26 are provided in the amplifier unit 31, a balance circuit capable
of adjusting the balance of the speaker output with respect to each input is added to the
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amplifier unit 31, and the operation knob is provided on the top panels 23, 43. You may take the
structure provided in. Thereby, the balance of the speaker output for each input can be
arbitrarily adjusted. For example, the output ratio between the speaker sound of the microphone
input inputted from the microphone and the speaker sound of the electric guitar to the guitar
input can be freely changed. Be
[0051]
Moreover, in each embodiment mentioned above, although the shape of the speaker box 20 and
50 was set to the square frustum shape or the shape of the speaker box 40 was set to the
truncated cone shape, the shape which can be attached to the root side of a microphone stand If
it is, it may be a triangular frustum shape, a conical shape, a pyramidal shape, a cubic shape, a
rectangular solid shape, a polygonal columnar shape, a spherical shape, an annular shape, or the
like. Further, although the cases 21, 41 and 51 of the speaker boxes 20, 40 and 50 have been
described by exemplifying the case made of plastic, they may be made of metal such as
aluminum or iron. Also, it may be wooden. In the case of metal, it is configured to secure
electrical insulation with respect to the amplifier unit 31, the power supply unit 33, and the like
as needed. Further, the number and the size of the speakers 36 and the like are appropriately set
to the appropriate number and the size according to the required specifications such as the
volume to be output as the speaker sound.
[0052]
As mentioned above, although the specific example of this invention was described in detail,
these are only an illustration and do not limit a claim. The art set forth in the claims includes
various variations or modifications of the specific examples described above. In addition, the
technical elements described in the present specification or the drawings exhibit technical
usefulness alone or in various combinations, and are not limited to the combinations described in
the claims at the time of filing. Furthermore, the techniques illustrated in the present
specification or the drawings simultaneously achieve a plurality of purposes, and achieving one
of the purposes itself has technical utility. In addition, the description in the parenthesis in the
column of [explanation of symbols] clearly indicates the correspondence between the terms used
in each embodiment described above and the terms described in the claims.
[0053]
2 Microphone stand 3 Pole 4 Boom 8 Leg shaft 11 Microphone 13 Microphone cord 15
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Microphone plug 20, 40, 50 Speaker box 21, 41, 51 Case 22, 42 Side panel (side wall) 22a 2,
52a: Openings 23, 43: Top panel 23a, 43a, 53a: Insertion holes 25, 45, 55: Speaker grille 26:
Input jack 27: Output jack 28: Volume knob 29, 49: Weight 29a, 49a: Recess 31 amplifier unit
(audio amplifier) 32 volume 33 power supply unit 36 to 39 speaker 52 side panel (a plurality of
side walls divided in an expandable manner) 53 top panel (fixed portion) 56 holder ring (fixed)
Part) 57 ... bolt 59 ... hinge (rotation mechanism) 100 ... floor surface M ... musician
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