JP2012222543

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DESCRIPTION JP2012222543
PROBLEM TO BE SOLVED: To provide a speaker net capable of improving acoustic
characteristics by reliably reinforcing a case where a speaker body is attached. SOLUTION: The
first reinforcing plate portion 16 attached to the inner surface of the upper case 2 together with
the speaker main body 11 and having a large diameter hole 20 having a size substantially
corresponding to the speaker main body 11 at the center portion; And a second reinforcing plate
portion 17 disposed opposite to the first reinforcing plate portion 16 and having a large number
of small holes 21 substantially in the entire area. Therefore, the upper case 2 at the place where
the speaker main body 11 is attached can be held between the first reinforcing plate portion 16
and the second reinforcing plate portion 17. For this reason, the upper case 2 at the place where
the speaker main body 11 is attached can be reliably reinforced by the first and second
reinforcing plate portions 16 and 17, whereby the upper case 2 at the place where the speaker
main body 11 is attached Sufficient rigidity to improve acoustic characteristics. [Selected figure]
Figure 3
スピーカネット
[0001]
The present invention relates to a speaker net for protecting a speaker main body incorporated
in an electronic musical instrument such as an electronic piano or a sound device.
[0002]
Generally, in a speaker net for protecting a speaker body, as described in Patent Document 1, the
speaker body is configured to be attached to the outer surface of a case provided inside with the
speaker body covered. There is.
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[0003]
Unexamined-Japanese-Patent No. 05-252584
[0004]
In such a speaker net, the peripheral edge of the speaker net is attached to a mounting groove
provided on the outer surface of the case and fixed by welding, or the peripheral edge of the
speaker net is disposed on the outer surface of the case and fixed by screwing It is configured to
be attached to the case by doing so.
[0005]
However, in such a speaker net, although the speaker body can be protected, the case where the
speaker body is attached can not be reinforced by the speaker net to sufficiently ensure the
rigidity of the case.
For this reason, when the speaker body generates a sound, the case vibrates in accordance with
the vibration due to the sound generation of the speaker body, and there is a problem that
sufficient acoustic characteristics can not be obtained.
[0006]
The problem to be solved by the present invention is to provide a speaker net in which the
acoustic characteristics can be improved by reliably reinforcing the case where the speaker body
is attached.
[0007]
According to the present invention, in a speaker net attached to a case in which a speaker main
body is provided to cover the speaker main body, the speaker net is attached to the inner surface
of the case together with the speaker main body, and a central portion substantially corresponds
to the speaker main body A first reinforcing plate portion having a large diameter hole, and a
second reinforcing plate portion disposed on the outer surface of the case so as to be opposed to
the first reinforcing plate portion and having a large number of small holes in almost the entire
area A speaker net characterized by
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[0008]
According to the present invention, the speaker main body includes the first reinforcing plate
portion attached to the inner surface of the case together with the speaker main body, and the
second reinforcing plate portion disposed on the outer surface of the case opposite to the first
reinforcing plate portion. It can hold the case where it is attached.
For this reason, the case of the location where the speaker body is attached can be reliably
reinforced by the first and second reinforcing plate parts, thereby sufficiently securing the
rigidity of the case where the speaker body is attached Since it can be done, acoustic
characteristics can be improved.
[0009]
In Embodiment 1 of the electronic keyboard instrument to which the speaker net of this
invention is applied, it is the top view which showed the state at the time of attaching one
speaker net to a musical instrument case.
It is a front view of the electronic keyboard instrument shown by FIG.
It is an expanded sectional view in the AA arrow of the electronic keyboard instrument shown by
FIG.
It is the expansion perspective view which showed the speaker net of the electronic keyboard
instrument shown by FIG.
FIG. 5 is an enlarged perspective view showing a state in which the speaker net shown in FIG. 4 is
developed. The state at the time of attaching the speaker net of the electronic keyboard
instrument shown by FIG. 1 to the upper case of a musical instrument case is shown, (a) is an
enlarged cross section of the principal part which showed the state which mounts a speaker net
from the back to the upper case. The figure, (b) is an expanded sectional view of the principal
part which showed the state where the speaker net was equipped to the upper case. It is an
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expanded sectional view in Embodiment 2 of the electronic keyboard instrument to which the
speaker net of this invention is applied. FIG. 8 is an enlarged perspective view showing a speaker
net of the electronic keyboard instrument shown in FIG. 7; FIG. 9 is an enlarged perspective view
showing a state in which the speaker net shown in FIG. 8 is developed. It is an expanded sectional
view of the principal part in the BB arrow of the speaker net shown by FIG. FIG. 14 is an enlarged
perspective view showing a speaker net in Embodiment 3 of the electronic keyboard instrument
to which the speaker net of the present invention is applied. FIG. 12 is an enlarged perspective
view showing a state in which the speaker net shown in FIG. 11 is developed. It is an expanded
sectional view of the principal part in CC arrow of the speaker net shown by FIG. The electronic
keyboard instrument to which the speaker net of this invention is applied WHEREIN: It is the
expanded sectional view which showed the modification of the attachment structure of the
speaker net with respect to an upper case.
[0010]
Embodiment 1 Hereinafter, Embodiment 1 in which the present invention is applied to an
electronic keyboard instrument will be described with reference to FIGS. 1 to 6. This electronic
keyboard instrument includes an instrument case 1 as shown in FIG. 1 and FIG. The instrument
case 1 is composed of an upper case 2 and a keyboard chassis 3. As shown in FIGS. 1 to 3, the
keyboard chassis 3 doubles as a lower case of the musical instrument case 1 and is formed of
synthetic resin. The keyboard chassis 3 is configured to be rotatably mounted in the vertical
direction with the plurality of keys 4 arranged in parallel on the upper surface thereof.
[0011]
In this case, as shown in FIGS. 1 to 3, the plurality of keys 4 are formed of a white key and a
black key, and as shown in FIG. 3, the respective rear end portions (right end portions in FIG. The
thin bent portions 4a are formed respectively, the bent portions 4a are attached to the
connecting portions 4b continuous in the key arrangement direction, and the connecting
portions 4b are attached to the key support portion 5 of the keyboard chassis 3. Thus, when the
front portion (the left side in FIG. 3) of the plurality of keys 4 is depressed from above, the
bending portion 4a bends so that it rotates counterclockwise around the bending portion 4a. Is
configured as.
[0012]
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Further, as shown in FIG. 3, the plurality of keys 4 are provided on the key 4 when the front
portion (left side in FIG. 3) is depressed from above and turned counterclockwise around the
bending portion 4a. The switch pressing portion 6 is configured to press the switch portion 7
provided on the keyboard chassis 3. The switch unit 7 includes a switch substrate 7a provided on
the keyboard chassis 3 and a dome-shaped rubber bulging portion 7b disposed on the switch
substrate 7a.
[0013]
Thereby, as shown in FIG. 3, when the dome-shaped rubber bulging portion 7 b is pressed by the
switch pressing portion 6 of the key 4, the switch portion 7 elastically deforms so that the rubber
bulging portion 7 b is crushed. The movable contact (not shown) provided inside the elastically
deformed rubber bulging portion 7b contacts a fixed contact (not shown) provided on the upper
surface of the switch substrate 7a, whereby the switch signal is output. It is configured to output.
[0014]
Furthermore, as shown in FIG. 3, when returning to the initial position after key depression, as
shown in FIG. 3, the elastic return force of the rubber bulging portion 7 b in the switch portion 7
and the bent portion 4 a of the key 4 The elastic recovery force causes the key 4 to be pushed up
to rotate clockwise around the bent portion 4 a of the key 4, and the stopper portion 8 provided
on the key 4 is located below the upper limit position restricting portion 9 of the keyboard
chassis 3. The upper limit position is restricted by returning to the initial position.
[0015]
By the way, the upper case 2 is made of synthetic resin, and as shown in FIGS. 1 to 3, the rear
end of the keyboard chassis 3 which is the lower case from the upper position corresponding to
each bent portion 4a of the plurality of keys 4 The keyboard chassis 3 is disposed on the
keyboard chassis 3 at a portion extending from the right side (the right end in FIG. 3), and is also
disposed on the keyboard chassis 3 at locations located on both sides in the arrangement
direction of the keys 4. It is configured to be mounted on top.
Thus, as shown in FIG. 1, the plurality of keys 4 are configured to be exposed above the musical
instrument case 1 except for the rear end (the right side in FIG. 3).
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[0016]
As shown in FIGS. 1 and 2, speaker units 10 are provided on both sides of the upper case 2 in the
key arrangement direction.
As shown in FIG. 3, the speaker unit 10 includes a speaker main body 11 and a speaker net 12.
The speaker body 11 includes a cone portion 13 and a magnet portion 14. The cone portion 13
has a configuration in which cone paper 13b is provided on the inner surface of the inverted
conical frame 13a. The magnet unit 14 is for vibrating a diaphragm (not shown) to generate a
sound, and is provided below the frame 13 a of the cone unit 13.
[0017]
In this case, as shown in FIGS. 1 and 6, the upper case 2 has a large diameter sound emission
hole 2 a for emitting the sound generated by the speaker body 11 to the outside of the upper
case 2, and the cone portion 13. Is provided corresponding to the upper surface of. Further, as
shown in FIG. 3, the speaker body 11 is electrically connected to a circuit board 15 provided on
the bottom of the keyboard chassis 3 located below the upper case 2 by a connection cable (not
shown). ing. The circuit board 15 is mounted with an electronic circuit for controlling the entire
circuit of the musical instrument. The switch substrate 7a of the switch unit 7 is electrically
connected to the circuit substrate 15 by another connection cable (not shown).
[0018]
On the other hand, the speaker net 12 is for covering and protecting the upper surface portion of
the speaker main body 11 as shown in FIGS. 3 to 6, and together with the speaker main body 11
on the inner surface (upper surface in FIG. 3) of the upper case 2 A first reinforcing plate portion
16 to be attached, a second reinforcing plate portion 17 disposed to face the first reinforcing
plate portion 16 on the outer surface (upper surface in FIG. 3) of the upper case 2, and the first
and second A connecting portion 18 for connecting the reinforcing plate portions 16 and 17 is
provided, and these are integrally formed.
[0019]
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Each of the first and second reinforcing plate portions 16 and 17 and the connecting portion 18
is made of a rigid metal plate such as stainless steel plate or steel plate as shown in FIGS. 4 and 5,
and the metal plate is bent by bending the metal plate. It is integrally formed.
In this case, as shown in FIG. 5, the first reinforcing plate portion 16 is formed in a rectangular
flat plate shape larger than the upper surface portion of the cone portion 13 of the speaker main
body 11. A large diameter hole 20 for sound emission is provided at the central portion of the
first reinforcing plate portion 16 so as to penetrate up and down in substantially the same size as
the sound emission hole 2 a of the upper case 2.
[0020]
Further, as shown in FIG. 5, mounting holes 16 a are respectively vertically penetrated at
locations corresponding to the four corners of the first reinforcing plate portion 16. The plurality
of mounting holes 16a are, as shown in FIG. 3, an outer peripheral portion of the upper surface
portion of the cone portion 13 of the speaker main body 11, that is, a flange portion 13c
provided on the outer peripheral portion of the upper surface portion of the frame 13a of the
cone portion 13. It is provided corresponding to each screw insertion hole 13d provided in four
places.
[0021]
In this case, as shown in FIG. 3, a plurality of mounting bosses 2b are inserted on the inner
surface (the lower surface in FIG. 3) of the upper case 2 and the respective mounting holes 16a
of the first reinforcing plate 16 and the screws of the speaker body 11. It is provided
corresponding to each of the holes 13d. As a result, the first reinforcing plate portion 16 is
arranged such that the respective mounting holes 16 a correspond to the lower surfaces of the
respective mounting bosses 2 b of the upper case 2, and the frame of the speaker main body 11
is formed on the lower surface of the first reinforcing plate portion 16. The screw insertion holes
13 d of the speaker main body 11 correspond to the attachment holes 16 a of the first
reinforcing plate portion 16, respectively.
[0022]
Further, as shown in FIG. 3, the first reinforcing plate portion 16 is disposed on the lower surface
of each mounting boss 2 b of the upper case 2, and the frame 13 a of the speaker main body 11
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is disposed on the lower surface of the first reinforcing plate portion 16. In the closed state, the
plurality of screws 19 are screwed to the plurality of mounting bosses 2 b from the lower side
through the respective screw insertion holes 13 d of the speaker main body 11 and the
respective mounting holes 16 a of the first reinforcing plate portion 16. It is configured to be
attached to the inner surface of the upper case 2 together with the speaker main body 11.
[0023]
As shown in FIG. 5, the second reinforcing plate portion 17 has a rectangular flat plate portion
17a substantially corresponding to the first reinforcing plate portion 16, and one side portion of
the peripheral portion of the plate portion 17a (in FIG. 5). And the side wall portions 17b
provided except for the lower side portion located on the connecting portion 18 side.
Thereby, the whole of the second reinforcing plate portion 17 is formed in a substantially box
shape. Further, in the plate portion 17a of the second reinforcing plate portion 17, a large
number of small holes 21 for sound emission are provided substantially in the entire area.
[0024]
As shown in FIGS. 3 to 5, the connecting portion 18 includes one side (upper side in FIG. 5) of the
first reinforcing plate 16 and one side (lower side in FIG. 5) of the second reinforcing plate 16.
Each is for connecting in a foldable manner. The connecting portion 18 is also provided with a
large number of small holes 22 for sound emission substantially over the entire area. In this case,
side walls 18a are provided at both ends of the connecting portion 18 positioned in a direction
orthogonal to the connecting direction in which the first and second reinforcing plate portions
16 and 17 are connected.
[0025]
As shown in FIG. 5, at each end where each side wall portion 18a of the connecting portion 18
and each side wall portion 17b of the second reinforcing plate portion 17 are adjacent to each
other, notches 17c and 18b are 45 degrees each. It is V-shaped at an angle. In addition, notches
18 b are formed at the other end of each side wall 18 a of the connecting portion 18 at an angle
of 45 degrees.
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[0026]
Thereby, as shown in FIG. 4 and FIG. 5, when the one side continued to the 1st reinforcement
board part 16 is bent 90 degrees upwards, the connection part 18 is a notch of the other end of
the side wall part 18a. The portion 18 b is configured to abut on the upper surface of the first
reinforcing plate portion 16 in a portion adjacent to the portion 18 b. In addition, when one side
of the connecting portion 18 continuous to the second reinforcing plate portion 17 is bent 90
degrees toward the first reinforcing plate portion 16, the notch portions 17 c and 18 b of the
side wall portions 17 b and 18 a are formed. Are in contact with each other, thereby causing the
first and second reinforcing plate portions 16 and 17 to vertically face each other.
[0027]
In this case, as shown in FIG. 3, the slit-like long hole 23 into which the first reinforcing plate
portion 16 is inserted is provided on the rear surface (right side surface in FIG. 3) of the upper
case 2 located at the location corresponding to the speaker portion 10. Is provided. The slit-like
long holes 23 have a height substantially the same as the thickness of the first reinforcing plate
portion 16 and a length substantially the same as the length of one side of the first reinforcing
plate portion 16 continuous with the connecting portion 18 in the lateral direction. (In FIG. 3, it
is elongated in the direction of the front and back of the sheet). The slit-like long hole 23 is
provided on the rear surface of the upper case 2 at a position corresponding to the height of the
lower surface of the mounting boss 2 b of the upper case 2.
[0028]
Further, as shown in FIGS. 1 and 3, on the upper surface of the upper case 2 located at a position
corresponding to the speaker portion 10, the lower portion of each side wall portion 17b of the
second reinforcing plate portion 17 and each side wall of the connecting portion 18 A mounting
groove 24 is provided in which the tip end of the portion 18a is inserted. The mounting groove
24 is, as shown in FIG. 1, a groove 24a into which the lower part of the side wall 17b located at
the tip (the front side in FIG. 1) of the second reinforcing plate 17 is inserted, and the second
reinforcing plate Grooves 24b respectively inserted by the lower portions of the side walls 17b
located on both sides (both sides in FIG. 1) of 17 and grooves 24c inserted respectively at the tip
of each side wall 18a of the connecting part 18; It is provided continuously.
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[0029]
Next, a case of manufacturing such a speaker net 12 will be described. First, the first and second
reinforcing plate portions 16 and 17 and the connecting portion 18 of the speaker net 12 are
formed to have a size in an expanded state by punching one metal plate by a press. Thereafter, a
large diameter hole 20 for sound emission is formed in the first reinforcing plate portion 16 by
punching a metal plate by a press. Further, the metal plate is punched to form a plurality of
attachment holes 16a in the first reinforcing plate portion 16, and a large number of small holes
21 for sound emission are formed in the second reinforcing plate portion 17, and a connecting
portion 18 also form a large number of small holes 22 for sound emission.
[0030]
Further, this metal plate is cut and processed by a press, and notches 17c and 18b are formed at
each end where each side wall 17b of the second reinforcing plate 17 and each side wall 18a of
the connecting part 18 are adjacent to each other. While the side walls 17b located on both sides
of the second reinforcing plate 17 and the side walls 17b located on the tip (the upper side in
FIG. 5) of the second reinforcing plate 17 are adjacent to each other. Cut off the end portions,
that is, the overlapping portions in the bending process described later.
[0031]
Thereafter, the side walls 17b of the second reinforcing plate 17 and the side walls 18a of the
connecting portion 18 are bent by a press to be vertically bent upward.
Then, as shown in FIG. 5, of the side walls 17b of the second reinforcing plate 17, the end
portions (upper side in FIG. 5) of the end portions of the side walls 17b located on both sides and
the second reinforcing plate The end portions of the side wall portions 17b located at the tip end
portions (the upper side portions in FIG. 5) of the portions 17 stand in a state of being in contact
with each other, and the second reinforcing plate portions 17 are formed to have a substantially
box shape. . Thereby, the speaker net 12 in a state in which the first reinforcing plate portion 16
and the second reinforcing plate portion 17 are connected by the connecting portion 18 and
developed is obtained.
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[0032]
By further bending the speaker net 12 in the expanded state, the first and second reinforcing
plate portions 16 and 17 are folded back so as to overlap. At this time, one side (the lower side in
FIG. 5) of the connecting portion 18 continuous with the first reinforcing plate portion 16 is bent
upward by 90 degrees, and the other side of the connecting portion 18 continuous with the
second reinforcing plate portion 17 The portion (the upper side in FIG. 5) is bent 90 degrees
toward the first reinforcing plate portion 16 side. At this time, the notch 18b at the other end of
each side wall 18a of the connecting portion 18 abuts on the upper surface of the first
reinforcing plate 16 at a location adjacent thereto.
[0033]
At this time, of the side walls 17 b of the second reinforcing plate 17, the end corresponding to
the notch 17 c of the side wall 17 b and the notch 18 b of the side wall 18 a of the connecting
portion 18. In a state in which the end portions corresponding to each other are in contact with
each other and continued, as shown in FIG. 4, the first reinforcing plate portion 16 and the
second reinforcing plate portion 17 are vertically connected in a state of being connected by the
connecting portion 18. opposite. Thereafter, at least the outer surfaces of the second reinforcing
plate portion 17 and the connecting portion 18 among the outer surfaces of the first and second
reinforcing plate portions 16 and 17 and the connecting portion 18 are coated. Thereby, the
speaker net 12 shown in FIG. 4 is manufactured.
[0034]
Next, the case where the speaker net 12 manufactured in this manner is attached to the upper
case 2 of the musical instrument case 1 will be described. First, as shown in FIG. 6A, the first
reinforcing plate portion 16 of the speaker net 12 is inserted into the long hole 23 provided in
the rear surface of the upper case 2 (right side surface in FIG. 6A). Is inserted from the rear (right
side in FIG. 6 (a)).
[0035]
At this time, the tip end portions of the first and second reinforcing plate portions 16 and 17
opposed to each other in the vertical direction, that is, the first and second reinforcing plate
portions 16 and 17 positioned on the opposite side to the connecting portion 18. Among the end
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portions, the end portion of the first reinforcing plate portion 16 corresponds to the long hole 23
on the rear surface of the upper case 2 and the end portion of the second reinforcing plate
portion 17 corresponds to the upper surface of the upper case 2 The side walls 17b located on
both sides of the second reinforcing plate 17 correspond to the grooves 24b (see FIG. 1) of the
mounting grooves 24 provided on the upper surface of the upper case 2.
[0036]
In this state, while moving the side wall portions 17b located on both sides of the second
reinforcing plate portion 17 along the insides of the groove portions 24b of the mounting groove
24 provided on the upper surface of the upper case 2, the first reinforcing plate portion 16 Is
pushed into the upper case 2 from the long hole 23 of the upper case 2.
Then, after the first reinforcing plate portion 16 moves along the lower surfaces of the plurality
of mounting bosses 2b provided on the inner surface of the upper case 2, the tip portion of the
second reinforcing plate portion 17 (left end portion in FIG. 6 (b) The lower portion of the side
wall portion 17b located in) is mounted to the groove portion 24a (see FIG. 1) located on the
front side of the mounting groove 24 of the upper case 2 and each side wall portion 18a of the
connecting portion 18 is provided on the rear surface of the upper case 2 It mounts ¦ wears with
each groove part 24c (refer FIG. 1) of the mounting groove 24 which was carried out.
[0037]
Thereby, as shown in FIG. 6 (b), the second reinforcing plate portion 17 is an upper portion in a
state where the upper surface portion of the upper case 2 is sandwiched between the first and
second reinforcing plate portions 16 and 17. The plurality of mounting holes 16 a of the first
reinforcing plate portion 16 correspond to the plurality of mounting bosses 2 b of the upper case
2. Thereafter, the lower portions of the side walls 17b of the second reinforcing plate 17 are
fixed in the mounting grooves 24 of the upper case 2 by welding. Thus, the second reinforcing
plate portion 17 is firmly fixed on the upper case 2.
[0038]
Then, the speaker main body 11 is disposed on the lower surface of the first reinforcing plate
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portion 16. At this time, as shown in FIG. 3, the upper surface portion of the cone portion 13 of
the speaker main body 11 is disposed on the lower surface of the first reinforcing plate portion
16, and a ridge provided on the outer periphery of the upper surface portion of the frame 13 a of
the cone portion 13 The screw insertion holes 13 d of the portion 13 c correspond to the
attachment holes 16 a of the first reinforcing plate portion 16. In this state, a plurality of screws
19 are inserted from the lower side into the screw insertion holes 13 d of the speaker main body
11 and the mounting holes 16 a of the first reinforcing plate 16, and screwed into the mounting
bosses 2 b of the upper case 2. Put it on.
[0039]
Thereby, as shown in FIG. 3, the first reinforcing plate portion 16 is firmly attached to the inner
surface of the upper case 2 together with the speaker main body 11. As a result, in the upper
case 2 where the speaker body 11 is attached, the strength is reinforced by the first reinforcing
plate portion 16 and the strength is also reinforced by the second reinforcing plate portion 17,
and the portion where the speaker body 11 is attached The rigidity of the upper case 2 in the
above is enhanced.
[0040]
Therefore, when the speaker main body 11 generates a sound, the upper case 2 does not vibrate
with the vibration due to the sound generation of the speaker main body 11, and the sound
generated by the speaker main body 11 is the first reinforcing plate portion 16 Through the
large diameter hole 20 of the upper case 2, the sound output hole 2a of the upper case 2, the
large number of small holes 21 of the second reinforcing plate 17 and the large number of small
holes 22 of the connecting portion 18 Be done. Thereby, the acoustic characteristics can be
improved.
[0041]
As described above, according to the speaker net 12 of the electronic keyboard instrument, it is
attached to the inner surface of the upper case 2 of the musical instrument case 1 together with
the speaker main body 11 and has a size substantially corresponding to the upper surface
portion of the speaker main body 11 at the center. A first reinforcing plate portion 16 provided
with a large diameter hole 20, and a second reinforcing plate portion disposed on the outer
surface of the upper case 2 so as to face the first reinforcing plate portion 16 and provided with
a large number of small holes 21 substantially throughout By providing the reinforcing plate
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portion 17, the upper case 2 at the place where the speaker main body 11 is attached by the first
and second reinforcing plate portions 16 and 17 is surely reinforced to improve the acoustic
characteristics. be able to.
[0042]
That is, in the speaker net 12, the first reinforcing plate portion 16 attached to the inner surface
of the upper case 2 together with the speaker body 11, and the second reinforcing plate portion
16 disposed on the outer surface of the upper case 2 opposite to the first reinforcing plate
portion 16. The upper case 2 at the place where the speaker main body 11 is attached can be
held by the reinforcing plate portion 17.
For this reason, the upper case 2 at the place where the speaker main body 11 is attached can be
reliably reinforced by the first and second reinforcing plate portions 16 and 17, whereby the
upper case 2 at the place where the speaker main body 11 is attached Since the rigidity of the
above can be sufficiently secured, the acoustic characteristics can be improved.
[0043]
In this case, since the first reinforcing plate portion 16 and the second reinforcing plate portion
17 are connected by the connecting portion 18, the upper case 2 at the place where the speaker
main body 11 is attached is reinforced by the first and second reinforcements. When the plate
portions 16 and 17 clamp, the first and second reinforcing plate portions 16 and 17 can reliably
clamp the upper case 2 from the upper and lower sides by the connecting portion 18. The upper
case 2 can be pressed by the respective reinforcing plate portions 16 and 17, whereby the
strength of the upper case 2 can be reliably reinforced by the first and second reinforcing plate
portions 16 and 17.
[0044]
Further, the connecting portion 18 connects the first and second reinforcing plate portions 16
and 17 so that the first reinforcing plate portion 16 can be inserted into the long hole 23 of the
upper case 2, The speaker net 12 can be easily and easily assembled to the upper case 2 in a
state where the upper and lower reinforcing plates 16 and 17 sandwich the upper case 2
vertically, thereby assembling the speaker net 12 Work can be improved.
[0045]
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In addition, the first reinforcing plate portion 16 is disposed on the inner surface of the upper
case 2, the speaker main body 11 is disposed on the lower surface of the first reinforcing plate
portion 16, and in this state the inner surface of the upper case 2 is formed by a plurality of
screws 19. By being attached together with the speaker main body 11, the upper case 2 at the
place where the speaker main body 11 is attached can be reliably reinforced by the first
reinforcing plate portion 16, and the speaker main body 11 is made the first reinforcing plate
portion 16. Can be firmly attached to the upper case 2.
[0046]
That is, the first reinforcing plate 16 is disposed on the lower surface of the plurality of mounting
bosses 2 b provided on the inner surface of the upper case 2, and the frame 13 a of the speaker
body 11 is disposed on the lower surface of the first reinforcing plate portion 16. In this state,
the plurality of screws 19 are screwed from the lower side to the plurality of mounting bosses 2b
through the respective screw insertion holes 13d of the speaker main body 11 and the respective
mounting holes 16a of the first reinforcing plate portion 16 The first reinforcing plate portion 16
can be securely and firmly attached to the inner surface of the speaker 2 together with the
speaker main body 11, whereby the attachment strength to the upper case 2 can be improved.
[0047]
Further, the second reinforcing plate portion 17 is provided with the side wall portion 17 b at the
peripheral edge portion of the rectangular plate portion 17 a substantially corresponding to the
first reinforcing plate portion 16 except for one side portion continuing to the connecting portion
18. Therefore, the strength of the entire second reinforcing plate portion 17 can be enhanced by
the side wall portion 17 b.
Therefore, even if a large number of small holes 21 are provided substantially in the entire area
of the plate portion 17a, the strength of the entire second reinforcing plate portion 17 can be
secured, whereby the upper case 2 of the portion to which the speaker main body 11 is attached
The strength can be reliably reinforced.
[0048]
In this case, when the second reinforcing plate portion 17 is disposed on the upper surface of the
upper case 2, the mounting groove is provided on the upper surface of the upper case 2 with the
lower portion of the side wall portion 17b provided on the peripheral portion of the plate portion
17a. The second reinforcing plate portion 17 can be securely and firmly fixed to the upper case 2
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because the second reinforcing plate portion 17 is fixed to the upper case 2 by welding. Even if
the thickness of the plate portion 17a is thin, Even if a large number of small holes 21 are
provided in the plate portion 17a, the strength of the upper case 2 can be reliably reinforced by
the second reinforcing plate portion 17 having the side wall portion 17b.
[0049]
Second Embodiment Next, with reference to FIGS. 7 to 10, a second embodiment in which the
present invention is applied to an electronic keyboard instrument will be described.
The same parts as those of the first embodiment shown in FIGS. 1 to 6 will be described with the
same reference numerals.
As shown in FIG. 9, this electronic keyboard instrument has a configuration in which a plurality
of reinforcing ribs 31 are provided on the first reinforcing plate portion 16 of the speaker net 30,
and the other configuration is substantially the same as that of the first embodiment. .
[0050]
That is, as shown in FIG. 9, the plurality of reinforcing ribs 31 are formed substantially radially
around the mounting holes 16 a corresponding to the four corners of the first reinforcing plate
portion 16.
As shown in FIG. 10, a part of the first reinforcing plate portion 16 is made to project upward by
pushing up the lower surface of the first reinforcing plate portion 16 toward the upper surface
by embossing with a press, as shown in FIG. It is configured.
Further, as shown in FIG. 7, it is desirable that the height of the reinforcing rib 31 protruding
upward is formed to be substantially the same height as the mounting boss 2 b provided on the
inner surface of the upper case 2.
[0051]
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In this case, the long hole 32 on the rear surface of the upper case 2 has one side portion of the
first reinforcing plate portion 16 (see FIG. 7), as in the first embodiment. Although the length 9 is
formed to have substantially the same length as the length of the upper side continuous to the
connecting portion 18, the height thereof is formed to be higher than that of the first
embodiment. That is, the elongated holes 32 are formed to be higher in height than the first
embodiment by the height of the reinforcing rib 31 formed in the first reinforcing plate portion
16.
[0052]
In addition, as shown in FIG. 7, when the first reinforcing plate portion 16 is inserted into the
upper case 2 through the long hole 32 of the upper case 2, the plurality of reinforcing ribs 31
are attached to the mounting bosses 2 b of the upper case 2. As shown in FIG. 9, each mounting
boss 2 b of the upper case 2 passes a position between the mounting holes 16 a of the first
reinforcing plate portion 16 so that each mounting boss 2 b passes between the reinforcing ribs
31 without contact. Is formed.
[0053]
When attaching such a speaker net 30 to the upper case 2, the mounting grooves 24 are
provided on the upper surface of the upper case 2 with the side wall portions 17 b located on
both sides of the second reinforcing plate 17 as in the first embodiment. The first reinforcing
plate portion 16 is pushed into the upper case 2 from the long hole 32 of the upper case 2 while
moving along the grooves 24b (see FIG. 1).
Then, the first reinforcing plate portion 16 moves along the lower surfaces of the plurality of
mounting bosses 2b provided on the inner surface (the lower surface in FIG. 7) of the upper case
2 and each reinforcing rib 31 of the first reinforcing plate portion 16 It moves along the inner
surface of the upper case 2.
[0054]
At this time, the mounting bosses 2 b of the upper case 2 pass through between the reinforcing
ribs 31 without coming into contact with the reinforcing ribs 31 of the first reinforcing plate
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portion 16. The lower portion of the side wall portion 17b located at the front end portion (left
end portion in FIG. 7) of the second reinforcing plate portion 17 is the groove portion 24a (see
FIG. 1) of the mounting groove 24 of the upper case 2 as in the first embodiment. At the same
time, the end portions of the side walls 18a of the connecting portion 18 are attached to the
groove 24c (see FIG. 1) of the mounting groove 24 provided on the rear surface of the upper
case 2.
[0055]
Thereby, as shown in FIG. 7, the second reinforcing plate portion 17 is attached to the upper case
2 in a state where the upper surface portion of the upper case 2 is sandwiched between the first
and second reinforcing plate portions 16 and 17. The plurality of mounting holes 16a of the first
reinforcing plate portion 16 correspond to the plurality of mounting bosses 2b of the upper case
2, and each reinforcing rib 31 positioned around the plurality of mounting holes 16a is a
mounting boss. It abuts on the inner surface of the upper case 2 located around 2b. After that, as
in the first embodiment, the lower portions of the side wall portions 17b of the second
reinforcing plate portion 17 are fixed in the mounting grooves 24 of the upper case 2 by
welding. Thus, the second reinforcing plate portion 17 is firmly fixed on the upper case 2.
[0056]
Then, the speaker body 11 is attached to the lower surface of the first reinforcing plate portion
16. At this time, as in the first embodiment, the upper surface portion of the cone portion 13 of
the speaker main body 11 is disposed on the lower surface of the first reinforcing plate portion
16, and a ridge portion provided on the outer periphery of the upper surface portion of the
frame 13 a of the cone portion 13 The screw insertion holes 13 d of 13 c correspond to the
attachment holes 16 a of the first reinforcing plate portion 16. In this state, a plurality of screws
19 are inserted from the lower side into the screw insertion holes 13 d of the speaker main body
11 and the mounting holes 16 a of the first reinforcing plate portion 16, and screwed into the
mounting bosses 2 b of the upper case 2. Let
[0057]
Then, as shown in FIG. 7, each reinforcing rib 31 of the first reinforcing plate portion 16 is
pressed against the inner surface of the upper case 2, and in this state, the first reinforcing plate
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portion 16 faces the inner surface of the upper case 2 It is attached firmly with 11. As a result,
the upper case 2 where the speaker body 11 is attached is reinforced more strongly than the first
embodiment by the first reinforcing plate portion 16 and the plurality of reinforcing ribs 31, and
the second reinforcing plate The strength is also reinforced by the portion 17 and the rigidity of
the upper case 2 at the portion where the speaker body 11 is attached is sufficiently enhanced.
[0058]
For this reason, when the speaker main body 11 generates a sound, the upper case 2 is more
reliably suppressed from vibrating due to the vibration due to the sound generation of the
speaker main body 11 than in the first embodiment, and the sound generated in the speaker
main body 11 The upper case passes through the large diameter hole 20 of the first reinforcing
plate portion 16, the sound emission hole 2 a of the upper case 2, the many small holes 21 of the
second reinforcing plate portion 17, and the many small holes 22 of the connecting portion 18.
Good sound is emitted to the outside of 2. Thereby, the acoustic characteristics can be improved
more than in the first embodiment.
[0059]
As described above, according to the speaker net 30 of the second embodiment, in addition to
the same function and effect as those of the first embodiment, the plurality of reinforcing ribs 31
are provided in the first reinforcing plate portion 16. The reinforcing rib 31 can increase the
strength of the first reinforcing plate portion 16. Therefore, the strength of the first reinforcing
plate portion 16 can be sufficiently secured even if the thickness of the first reinforcing plate
portion 16 is formed thin, or even if a light and easy-to-process material such as aluminum is
used.
[0060]
In this case, the plurality of reinforcing ribs 31 are formed substantially radially around the
mounting holes 16a of the first reinforcing plate portion 16, and the plurality of mounting bosses
whose height is provided on the inner surface of the upper case 2 When the first reinforcing
plate portion 16 is attached to the mounting boss 2 b of the upper case 2 together with the
speaker main body 11 by a plurality of screws 19, the height of the first reinforcing plate portion
16 is approximately Each reinforcing rib 31 can be pressed against the inner surface of the
upper case 2 located around the mounting boss 2b.
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[0061]
Therefore, the plurality of reinforcing ribs 31 of the first reinforcing plate portion 16 can firmly
attach the first reinforcing plate portion 16 to the inner surface of the upper case 2 together with
the speaker main body 11.
As a result, the strength of the upper case 2 at the location where the speaker main body 11 is
attached can be reinforced more reliably and strongly than the first embodiment by the first
reinforcing plate portion 16 and the plurality of reinforcing ribs 31. The rigidity of the upper
case 2 at the location where the speaker body 11 is attached can be further enhanced.
[0062]
Embodiment 3 Next, Embodiment 3 in which the present invention is applied to an electronic
keyboard instrument will be described with reference to FIGS. 11 to 13. Also in this case, the
same parts as those of Embodiment 1 shown in FIGS. This electronic keyboard instrument has a
configuration in which an acoustic lens portion 36 is provided on the first reinforcing plate
portion 16 of the speaker net 35 as shown in FIG. 12, and the other configuration is substantially
the same as that of the first embodiment.
[0063]
In this case, as shown in FIG. 12, the beam portion 37 is stretched in a cross shape in the large
diameter hole 20 of the first reinforcing plate portion 16, and in a portion where the cross beam
portion 37 intersects. , And an acoustic lens unit 36 is provided. As shown in FIGS. 12 and 13,
the acoustic lens portion 36 includes a plurality of through holes 36a penetrating vertically and a
plurality of directional fins 36b which are inclined and stood on the upper surface at the edge of
the through holes 36a. , And these are formed by cutting and raising the intersections of the
beam portions 37.
[0064]
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In this case, as shown in FIGS. 12 and 13, the plurality of through holes 36a are arranged along
the front-rear direction (the left-right direction in FIG. 13) of the first reinforcing plate 16 which
is the front-rear direction of the instrument case 1. In the state, the first reinforcing plate portion
16 is formed to be elongated in the left-right direction (in FIG. 13, in the front and back direction
of the sheet of FIG. 13). As shown in FIG. 13, the plurality of directional fins 36b are for emitting
the sound generated in the speaker main body 11 from the upper surface of the upper case 2
toward the upper front side (upper left side in FIG. 13) In a state of being obliquely inclined
toward the upper front side of the upper case 2 (upper left side in FIG. 13), the upper case 2 is
formed upright at each edge of the plurality of through holes 36a.
[0065]
Further, the acoustic lens portion 36 is configured to be disposed substantially at the center of
the upper surface of the cone portion 13 of the speaker body 11 when the speaker net 35 is
attached to the upper case 2. Thus, the acoustic lens portion 36 is provided at the intersection of
the cross-shaped beam portions 37 when the sound generated by the speaker main body 11
passes through the large diameter hole 20 of the first reinforcing plate portion 16. The sound
emitted from the sound output holes 2a of the upper case 2 and the large number of small holes
21 of the second reinforcing plate 17 after passing through the plurality of through holes 36a is
the upper case 2 by the directional fins 36b. It is comprised so that it may be emitted toward the
front upper side (in FIG. 13, left upper side) of.
[0066]
According to the speaker net 35 of the third embodiment, in addition to the same function and
effect as the first embodiment, the sound generated in the speaker main body 11 by the acoustic
lens portion 36 provided in the first reinforcing plate portion 16 is Since sound can be emitted
favorably in a predetermined direction, that is, in the upper front side of the musical instrument
case 1, the acoustic performance is good, and the acoustic characteristics can be further
improved.
[0067]
In this case, the acoustic lens portion 36 is provided in such a state that the acoustic lens portion
36 is erected on the upper surface of the portion where the beam portion 37 intersects with a
plurality of through holes 36a directed vertically through the portion where the beam portion 37
intersects. Since the plurality of directional fins 36b are provided, when the sound generated in
the speaker main body 11 passes through the plurality of through holes 36a, the sound passing
through is directed to the inclination direction of the plurality of directional fins 36b. This can
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enhance the acoustical properties.
[0068]
In the first to third embodiments described above, the long holes 23 and 32 are provided on the
rear surface of the upper case 2, and the first reinforcing plate portions 16 of the speaker nets
12, 30 and 35 are provided in the upper case 2 from the rear of the upper case 2. Although the
case where the speaker nets 12, 30, 35 are attached to the upper case 2 by being inserted into
the long holes 23, 32, has been described, the present invention is not limited thereto. For
example, as in the modification shown in FIG. The nets 12, 30, 35 may be mounted from the
front of the upper case 2 (left side in FIG. 14).
[0069]
In this case, the long hole 40 is provided on the front surface (left side surface in FIG. 14) of the
upper case 2 and the first reinforcing plate portion of each of the speaker nets 12, 30, 35 of the
first to third embodiments from the front of the upper case 2 The speaker nets 12, 30, 35 of the
first to third embodiments may be configured to be attached to the upper case 2 by inserting 16
into the long holes 40 of the upper case 2.
[0070]
Although the first to third embodiments and the modifications thereof have been described as
applied to an electronic keyboard instrument, the electronic keyboard instrument does not
necessarily have to be an electronic keyboard instrument. The present invention can be widely
applied to electronic devices having a main body.
[0071]
As mentioned above, although some embodiments of this invention were described, this
invention is not limited to these, The invention described in the claim, and the range of
equivalence are included.
The invention described in the claims of the present application is appended below.
[0072]
(Supplementary Note) The invention according to claim 1 is a speaker net attached to a case in
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which a speaker main body is provided to cover the speaker main body, the speaker net being
attached to the inner surface of the case with the speaker main body A first reinforcing plate
portion having a large diameter hole having a size substantially corresponding to that of the
speaker body, and an outer surface of the case disposed opposite to the first reinforcing plate
portion and having a large number of small holes substantially throughout (2) A speaker net
characterized by including two reinforcing plate portions.
[0073]
The invention according to claim 2 is the speaker net according to claim 1, wherein the first
reinforcing plate portion and the second reinforcing plate portion are connected by a connecting
portion. is there.
[0074]
The invention according to claim 3 is the speaker net according to claim 1 or 2, wherein the first
reinforcing plate portion is provided with a reinforcing rib.
[0075]
The invention according to claim 4 is the speaker net according to any one of claims 1 to 3,
wherein an acoustic lens portion is provided in the large diameter hole in the first reinforcing
plate portion. It is a speaker net to be characterized.
[0076]
DESCRIPTION OF SYMBOLS 1 musical instrument case 2 upper case 2a sound output hole 2b
attachment boss 3 keyboard chassis 4 keys 10 speaker part 11 speaker main body 12, 30, 36
speaker net 16 1st reinforcement board part 16a attachment hole 17 2nd reinforcement board
part 17a board part 17b Side wall 18 Connecting portion 18a Side wall 20 Large diameter hole
21, 22 Small hole 23, 32, 40 Long hole 24 Mounting groove 31 Reinforcing rib 36 Acoustic lens
portion 36a Through hole 36b Directional fin
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