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JPH09160559

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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
financial decisions, should not be based on machine-translation output.
DESCRIPTION JPH09160559
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker device used in an electronic keyboard instrument such as an electronic piano.
[0002]
2. Description of the Related Art Conventionally, as a speaker device of an electronic keyboard
instrument, for example, the one shown in FIG. 7 has been known. That is, the speaker device is
attached from the lower surface side of the top plate 8 to the speaker mounting hole provided in
the top plate 8 of the electronic keyboard instrument, and the speaker box 51 is mounted on the
top plate 8 so as to surround the speaker 56. And the shelf board 2.
[0003]
In such a speaker device, if it is intended to improve the bass reproduction capability (that is, if it
is intended to widen the lower limit of the bass reproduction limit), it is necessary to increase the
capacity of the speaker box 51. The
[0004]
However, since the capacity of the speaker box 51 is limited by the distance between the top
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plate 8 and the shelf board 2 (the distance between the top plate 8 and the keyboard cover 6
when the keyboard lid 6 interferes), the capacity of the speaker box 51 is expanded In this case,
the space between the top plate 8 and the shelf 2 (or the keyboard lid 6) is increased to enlarge
the case of the electronic keyboard instrument.
As described above, when the distance between the top plate 8 and the shelf 2 (or the keyboard
lid 6) is increased, the amount of the material used for the case is increased, and the
manufacturing cost is increased.
[0005]
The present invention has been made in view of the above problems, and it is an object of the
present invention to provide a speaker device of an electronic keyboard instrument capable of
improving the bass reproduction capability without increasing the size of the case of the
electronic keyboard instrument.
[0006]
SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the invention
according to claim 1 is a speaker device of an electronic keyboard instrument, which is a top
board which is an upper surface of a case of the electronic keyboard instrument. A speaker box
provided from the upper side to the lower side and a speaker attached to the upper side of the
top plate of the speaker box are characterized.
[0007]
The speaker box in the present invention is provided from above to below the top plate which is
the top surface of the case of the electronic keyboard instrument.
Here, the lower side of the top plate is limited in capacity by the presence of the shelf board and
the keyboard lid, but the upper side of the top plate is not limited in capacity because it is an
open space.
Therefore, when the capacity of the speaker box is increased for the purpose of widening the
lower limit of the reproduction limit of the bass of the speaker, the case of the electronic
keyboard instrument is made large by configuring the speaker box to pop out from above the top
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plate. The capacity of the speaker box can be increased without doing so.
[0008]
Further, the speaker in the present invention is attached above the top plate in the speaker box.
Generally, in consideration of the fact that the top of the electronic keyboard instrument is
located between the chest and the head of the player, the speaker mounted above the top is
placed near the player's ear. For this reason, the performer can easily listen to the performance
sound emitted from the speaker.
[0009]
The invention according to claim 2 is the speaker device of the electronic keyboard instrument
according to claim 1, characterized in that the speaker is mounted such that the diaphragm is
inclined forward. In the present invention, the speaker is attached so that the diaphragm is
inclined forward, so that the performer can more easily listen to the playing sound emitted from
the speaker than when the diaphragm is directed upward. . In particular, since the high-pitched
sound has high directivity, there is a possibility that it will not reach the performer directly when
the diaphragm is directed upward, but this is not the case in the present invention.
[0010]
The invention according to claim 3 is the speaker device of the electronic keyboard instrument
according to claim 1 or 2, wherein the speaker is attached outward so as to close a speaker
attachment hole formed in the speaker box. It is characterized by In the present invention, since
the speaker is attached outward so as to close the speaker mounting hole formed in the speaker
box, the sound emitted from the speaker is not stagnated or reflected in the speaker box. , The
player can listen to clear sound.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of the present
invention will be described below with reference to the drawings. It is needless to say that the
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embodiment of the present invention is not limited to the following examples at all, and various
modes can be adopted within the technical scope of the present invention. [First Embodiment]
FIG. 1 is an explanatory view of an electronic keyboard instrument according to a first
embodiment, wherein (a) is a front view and (b) is a right side view. FIG. 2 is an assembled
perspective view of the speaker box of the first embodiment.
[0012]
The electronic keyboard instrument 10 of the first embodiment mainly includes a shelf board 2, a
keyboard 4, a keyboard cover 6, a top board 8, a speaker box 11, and a speaker 16. The shelf
board 2 is horizontally installed between a pair of left and right vertical side plates 3, 3 and a
plurality of keyboards 4, 4... An action load simulation member 5 is provided on the back side
(right side in FIG. 1B) of the keyboard 4. The action load simulating member 5 applies a load
which the action mechanism of the acoustic piano gives to the normal keyboard when the
keyboard 4 is depressed. Further, on the upper part of the keyboard 4 is provided a slideable
keyboard lid 6 which can be opened and closed. The keyboard lid 6 is disposed between the top
plate 8 and the shelf 2 in the open state (see FIG. 1B), and is disposed at a position covering the
upper portion of the keyboard 4 in the closed state.
[0013]
The top plate 8 is provided so as to bridge the upper surfaces of the pair of left and right vertical
side plates 3, 3. Through holes 9 are formed in the top plate 8 on the left and right sides. The
through hole 9 has a size substantially corresponding to the lower opening of the upper portion
12 described later. Further, the height of the top plate 8 is such a height as to be positioned
between the chest and the head of the player when the player sits down on a performance chair
and plays.
[0014]
The speaker box 11 is provided from the upper side to the lower side of the top plate 8. As
shown in FIG. 2, the speaker box 11 is composed of a lower portion 13 made of resin as well as
an upper portion 12 made of resin. The upper portion 12 is a box-like body having no bottom
surface, a flange 12a is provided at the lower end, and a speaker mounting hole 12c is provided
on the top surface, that is, the speaker mounting surface 12b. Further, the speaker mounting
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surface 12b is inclined forward. On the other hand, the lower portion 13 is a box-like body
having no upper surface, and a flange 13a is provided at the upper end. The lower portion 13 is
formed to be longer in the left-right direction than the upper portion 12 (that is, substantially
equal to the length from the side plate 3 to the center of the electronic keyboard instrument 10).
The speaker box 11 is disposed so that the flange 12a of the upper portion 12 abuts on the
periphery of the through hole 9 of the top plate 8 from above the top plate 8, and the flange 12a
is screwed or adhesively attached to the top surface of the top plate 8. And the flange 13a of the
lower portion 13 is disposed so as to cover the through hole 9 of the top plate 8 from the lower
side of the top plate 8, and then the flange 13a is fixed to the lower surface of the top plate 8
with a screw or adhesive. It is formed by The lower portion 13 is provided at a position not
interfering with the keyboard lid 6 between the top plate 8 and the shelf plate 2 (see FIG. 1B).
[0015]
The speaker 16 is a full range speaker capable of covering the entire range from the high tone
range to the low tone range, and is attached outward so as to close the speaker attachment hole
12 c formed in the speaker box 11. The speaker 16 is a closed-type speaker, and the diaphragm
16a is also inclined forward and disposed toward the player because the speaker mounting
surface 12b is inclined forward.
[0016]
The exterior members of the electronic keyboard instrument 10 are collectively called a case,
such as the side plates 3 and 3 and the top plate 8 or the like. Further, various sensors (not
shown) are provided on the keyboard 4, and the various sensors are wired to transmit detection
signals to a control device (not shown). Further, the control device is connected so as to output a
sound to the speakers 16 via a digital sound source (not shown).
[0017]
Next, the operation of the electronic keyboard instrument 10 of the first embodiment will be
described. When the player depresses the keyboard 4, the control device receives detection
signals of various sensors provided on the keyboard 4, and causes the speakers 16, 16 to output
sounds via the digital sound source based on the detection signals.
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[0018]
At this time, since the capacity of the speaker box 11 is large, the lower limit of the reproduction
limit of the bass can be expanded, and the lower sound can be produced. That is, compared with
the conventional case where the speaker box is provided only between the top plate 8 and the
shelf plate 2, the capacity is larger by the upper portion 12 provided above the top plate 8 in the
present embodiment, That's why we can make lower sounds.
[0019]
Further, since the speaker box 11 is configured to pop out above the top plate 8, only the
capacity of the speaker box 11 can be increased without enlarging the case itself of the electronic
keyboard instrument 10. Furthermore, since the speaker 16 is attached above the top plate 8, the
speaker 16 is disposed at a position close to the player's ear, so that the player can easily listen
to the playing sound emitted from the speaker 16. In addition, since the playing sound emitted
from the speaker 16 is hardly reflected to the floor or causes phase interference, for example, the
effects of the reverberation circuit and the sound field reproduction circuit developed for two
channels are maximized. Can. In other words, in the reverberation circuit etc., the reflected sound
is electrically generated in advance or phase interference is performed to produce the surround
effect etc. However, if the sound emitted from the speaker is reflected to the floor or phase
interference is performed, as designed Since it is not possible to obtain the effect of (1), it is
advantageous to obtain the effect as designed if such reflection or the like does not occur.
[0020]
Furthermore, since the speaker 16 is attached so that the diaphragm 16a is inclined forward, the
performer listens more to the playing sound emitted from the speaker 16 as compared with the
case where the diaphragm 16a is directed upward. It becomes easy to do. Moreover, since the
speaker 16 is attached outward so as to close the speaker attachment hole 12 c formed in the
speaker box 11, the sound emitted from the speaker 16 is trapped or reflected in the speaker box
11. The player can hear clear sound without having to Second Embodiment FIG. 3 is a
perspective view of a speaker box according to a second embodiment. The electronic keyboard
instrument of the second embodiment differs from the first embodiment only in the speaker box,
so only the speaker box will be described.
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[0021]
The speaker box 21 of the second embodiment comprises a resin box 22 and a thick wooden
baffle plate 23. The resin box 22 is a box-shaped body with a bottom, and the upper end is
inclined forward. The wooden baffle plate 23 is provided with a speaker mounting hole 23 c and
covers the upper end of the resin box 22. For this reason, the wooden baffle plate 23 is inclined
forward. The speaker box 21 is fitted in the through hole 9 provided in the top plate 8, and the
bottom surface 21a (that is, the bottom surface of the resin box 22) is disposed at a position not
interfering with the keyboard lid 6, and the wooden baffle plate 23 is It is disposed above the
plate 8.
[0022]
The operation and effects of the second embodiment are the same as those of the first
embodiment, and therefore the description thereof is omitted. [Other Embodiments] The speaker
box 11 of the first embodiment may be configured as shown in FIGS. 4 (a) and 4 (b). That is, the
upper portion 112 shown in FIG. 4A is obtained by making the upper portion 12 of the first
embodiment substantially the same as the length of the lower portion 13 in the left-right
direction. FIG. 4B is a box-like body 18 continuous from one side plate 3 to the other side plate 3
in appearance, and a partition plate 19 is provided to divide into two speaker boxes 11 at
substantially the center thereof. is there. Even when the configuration of FIGS. 4 (a) and 4 (b) is
adopted, the same operation and effect as the first embodiment can be obtained.
[0023]
Further, the speaker box 11 of the first embodiment may be configured as shown in FIGS. 5 (a) to
5 (d). That is, in FIG. 5A, the front surface (vertical surface) of the upper portion 212 is a speaker
attachment surface 212b, and the speaker 16 is attached to the speaker attachment surface
212b. In FIG. 5B, the speaker mounting surface 312b of the upper portion 312 is inclined
forward as in the first embodiment, but the shape of the upper portion 312 seen from the side is
a trapezoidal shape in the first embodiment It is different. In FIG. 5C, the upper surface
(horizontal surface) of the upper portion 412 is a speaker mounting surface 412b, and the
diaphragm of the speaker 16 is mounted on the speaker mounting surface 412b so that the
diaphragm is directed upward. Further, in FIG. 5D, the keyboard lid 506 is opened and closed by
a hinge so that the keyboard lid 506 is not disposed between the top plate 8 and the shelf 2 with
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the keyboard lid 506 open. It is a thing. In this case, the lower portion 513 of the speaker box 11
can be extended from the top plate 8 to just above the shelf plate 2, and the capacity is increased
compared to the first embodiment.
[0024]
Also in FIGS. 5A to 5D described above, the effect of being able to improve the bass reproduction
capability can be obtained without increasing the size of the case of the electronic keyboard
instrument. In the first embodiment, a full range speaker is provided as the speaker 16. However,
a tweeter for high frequency range may be used together with the full range speaker to form a
two-way speaker or a three-way speaker. Alternatively, as shown in FIG. 6, a speaker box 31 is
separately provided in the lower space of the shelf board 2, and a speaker 36 for a large
diameter super low frequency band is attached to the speaker mounting hole of the speaker box
31. May be
[0025]
Further, although the closed type speaker device is taken up in the first embodiment, a bass
reflex type may be adopted by providing a sound output hole other than the speaker mounting
hole in the baffle plate. In this case, the sound from the back side of the diaphragm of the
speaker comes out of the sound emission hole, but the sound coming out of the sound emission
hole is in phase with the sound from the front side of the diaphragm of the speaker By designing,
the lower limit of the bass reproduction limit can be further extended.
[0026]
Brief description of the drawings
[0027]
FIG. 1 is an explanatory view of an electronic keyboard instrument according to a first
embodiment, wherein (a) is a front view, and (b) is a right side view.
[0028]
FIG. 2 is an assembled perspective view of the speaker box of the first embodiment.
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[0029]
FIG. 3 is a perspective view of a speaker box according to a second embodiment.
[0030]
FIG. 4 is an explanatory view of a modified example of the first embodiment.
[0031]
FIG. 5 is an explanatory view of a modified example of the first embodiment.
[0032]
FIG. 6 is an explanatory view of a modified example of the first embodiment.
[0033]
FIG. 7 is an explanatory view of a conventional electronic keyboard instrument.
[0034]
Explanation of sign
[0035]
Reference Signs List 2 shelf board 3 side plate 4 keyboard 5 keyboard lid 8 top plate 9 through
hole 10 electronic keyboard instrument 11・ ・ Speaker box, 12 ... upper part, 13 ... lower part,
16 ... speaker, 16a ... diaphragm
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