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JPH07244486

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DESCRIPTION JPH07244486
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
electronic keyboard instrument such as an electronic piano and an electronic organ, and in
particular, an electronic keyboard comprising speakers having substantially the same output
characteristics on the bass keyboard side and the treble keyboard side. About the instrument.
[0002]
2. Description of the Related Art Conventionally, in an electronic keyboard instrument such as an
electronic piano, speakers having substantially the same output characteristics are disposed on
the bass keyboard side and the treble keyboard side, and speakers for mainly bass are provided
on the bass keyboard side. Therefore, localization is performed by reproducing high-pitched
sound mainly from a speaker on the high-pitched keyboard side (hereinafter referred to as highpitched sound side speaker).
[0003]
6 and 7 show an electronic keyboard instrument of this type, and in these figures, reference
numeral 11 indicates a main case in which the keyboard 13 is disposed.
The main body case 11 is supported on both sides by a side plate 15, and a pedal base 17 is
horizontally bridged under the side plate 15.
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[0004]
The main body case 11 is formed by the upper panel 19, the back panel 21, the shelf board 23
and the like, and the bass side speaker 25 and the treble side speaker having substantially the
same output on the bass keyboard side and the treble keyboard side of the shelf board 23 27 are
arranged.
[0005]
The diaphragms 25 a and 27 a of the low-pitched speaker 25 and the high-pitched speaker 27
are disposed to face the through holes 23 a and 23 b formed in the shelf plate 23.
In this electronic keyboard instrument, the shelf plate 23 is a baffle plate, and sound waves
generated from the diaphragms 25a and 27a of the low-pitched speaker 25 and the high-pitched
speaker 27 are radiated to the front and back of the diaphragms 25a and 27a, respectively. The
sound waves from the rear surface of the diaphragms 25a and 27a are emitted upward, mainly
through or through the gap formed in the main body case 11.
[0006]
However, in such a conventional electronic keyboard musical instrument, since the speakers
having the same output characteristic are used for the low-pitched side speaker 25 and the highpitched side speaker 27, strings are actually used by the keyboard. Compared to a grand piano or
the like which generates a sound by striking the key, there is a problem that it is difficult to
obtain a localization close to that of the grand piano etc. because the volume of the bass region is
small.
[0007]
That is, in general, in this type of electronic keyboard instrument, in order to obtain a good
stereo effect in the middle to high frequency range, speakers having the same output
characteristic are used for the low side speaker 25 and the high side speaker 27, therefore If the
diaphragm 25a of the bass side speaker 25 is increased to increase the volume of the bass
region, the diaphragm 27a of the treble side speaker 27 also needs to be enlarged, and the treble
characteristic of the treble side speaker 27 is deteriorated. It becomes difficult to obtain a high
range sufficiently.
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2
[0008]
Further, in the conventional electronic keyboard musical instrument, since the bass side speaker
25 and the treble side speaker 27 are simply disposed in the continuous space formed above the
shelf plate 23 of the main body case 11, the bass side speaker 25 emits the sound. The sound
waves thus produced affect the vibration of the diaphragm 27a of the high-tone speaker 27,
while the sound waves emitted from the high-tone speaker 27 affect the vibrations of the
diaphragm 25a of the low-pitch speaker 25, There is a problem that it becomes difficult to obtain
a good stereo effect.
[0009]
The present invention has been made to solve such conventional problems, and it is intended to
provide a grand piano or the like without deteriorating the treble characteristic of the speaker
while using the bass keyboard side and the treble keyboard side speaker having substantially the
same output characteristic. It is an object of the present invention to provide an electronic
keyboard instrument capable of achieving near-localization and reliably preventing the mutual
influence of the speakers on the bass keyboard side and the treble keyboard side.
[0010]
In the electronic keyboard instrument of the present invention, speakers having substantially the
same output characteristics are respectively provided on the bass keyboard side and the treble
keyboard side of the upper surface of the shelf board of the main body case on which the
keyboard is disposed. In the electronic keyboard musical instrument, wherein the diaphragm of
the speaker is disposed opposite to the through hole formed on the bass keyboard side and the
treble keyboard side of the shelf, the loudspeaker on the bass keyboard side is provided on the
upper surface of the shelf. And a cabinet for the low frequency range that increases the volume
of the low frequency range of the speaker.
[0011]
In the electronic keyboard instrument according to claim 2, the cabinet is disposed on the lower
surface of the shelf board of the main body case in which the keyboard is disposed, and speakers
having substantially the same output characteristics are respectively disposed on the bass
keyboard side and the treble keyboard side of the cabinet. The diaphragm of the speaker is
disposed opposite to the through hole formed on the bass keyboard side and the treble keyboard
side of the bottom of the cabinet, and the cabinet is partitioned by a partition plate, and the
loudspeaker on the bass keyboard side is accommodated A speaker keyboard side speaker room
for increasing the volume of the bass region of the speaker, and a treble keyboard side speaker
room in which the speakers on the treble keyboard side are accommodated.
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[0012]
In the electronic keyboard instrument according to claim 3, the volume of the low frequency
range cabinet or the low frequency keyboard side speaker room according to claim 1 or 2 is set
such that the volume of low frequency sound having a frequency of 50 Hz to 200 Hz is
increased. It is.
[0013]
In the electronic keyboard instrument according to the first aspect of the invention, the volume
of the low frequency range of the speaker on the low frequency keyboard side is increased by the
low frequency range cabinet, and as a result, the sound is localized closer to the grand piano or
the like.
[0014]
Further, since the progress of the sound waves emitted from the speakers on the low-pitched
keyboard side and the high-pitched keyboard side is blocked by the low-frequency cabinet, the
mutual influence of the speakers on the low-pitched keyboard side and the high-pitched
keyboard side disappears.
[0015]
Furthermore, since speakers having substantially the same output characteristics are used as the
speakers on the low-pitched keyboard side and the high-pitched keyboard side, the stereo effect
in the middle to high tone range is improved.
In the electronic keyboard instrument according to the second aspect of the present invention,
the volume of the low tone range of the speaker on the side of the bass keyboard is increased by
the bass keyboard side speaker room, and as a result, localization is closer to the grand piano or
the like.
[0016]
In addition, since the progress of the sound waves emitted from the speakers on the low-pitched
keyboard side and the high-pitched keyboard side is blocked by the partition plate, mutual
influence by the back sounds of the speakers on the low-pitched keyboard side and the high-
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pitched keyboard side is eliminated.
[0017]
Furthermore, since speakers having substantially the same output characteristics are used as the
speakers on the low-pitched keyboard side and the high-pitched keyboard side, the stereo effect
in the middle to high tone range is improved.
In the electronic keyboard instrument according to the third aspect, the volume of the bass of a
frequency of 50 Hz to 200 Hz, which is a frequency generated by striking the keyboard in the
bass range, is increased, and as a result, localization closer to a grand piano or the like is
achieved.
[0018]
Embodiments of the present invention will be described in detail with reference to the drawings.
FIGS. 1 and 2 show a first embodiment of the electronic keyboard instrument of the present
invention. In these figures, reference numeral 31 denotes a main body case in which the
keyboard 33 is disposed.
[0019]
The main body case 31 is supported on both sides by a side plate 35, and a bottom base 37 is
disposed below the side plate 35.
A pedal base 39 is horizontally bridged between the wife base 37.
[0020]
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The main body case 31 has a control panel 41, an upper panel 43 and a back panel 45, which
are disposed above the shelf board 47.
Arms 49 are disposed on both sides of the main body case 31, and a keyboard lid 51 is slidably
inserted in the control panel 41.
[0021]
On the bass keyboard side and the treble keyboard side of the shelf board 47, a bass side speaker
53 and a treble side speaker 55 having substantially the same output characteristics are
disposed.
The diaphragms 53 a and 55 a of the low-pitched speaker 53 and the high-pitched speaker 55
are disposed to face the through holes 47 a and 47 b formed in the shelf plate 47.
[0022]
In this embodiment, on the upper surface of the shelf plate 47, a low frequency range cabinet 57
which covers the low frequency side speaker 53 and increases the volume of the low frequency
range of the low frequency side speaker 53 is disposed.
[0023]
The low frequency range cabinet 57 has a rectangular parallelepiped shape whose lower surface
is opened, and the lower surface opening is fixed to the upper surface of the shelf plate 47 via an
L-shaped attachment member 59, for example.
[0024]
The volume V of the low frequency range cabinet 57 is a volume determined from the equation
described below.
V = 3.5 × 104 a4 / m 0 f 02 [(f C / f 0) 2-1] [m 3] Here, m 0 is the equivalent mass, a is the
effective vibration radius, f 0 is the lowest resonance frequency, and f c is the bass speaker 53 Is
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the lowest resonance frequency when the low frequency band cabinet 57 is mounted.
[0025]
In this embodiment, the lowest resonance frequency f0 is a frequency around 50 Hz which is an
important frequency generated by hitting the middle keyboard in the low tone range.
In the electronic keyboard instrument described above, since the low frequency range cabinet 57
is disposed to cover the low frequency side speaker 53 of the shelf board 47, the volume of the
low frequency range of the low frequency side speaker 53 is increased by the low frequency
range cabinet 57. While using the bass side speaker 53 and the treble side speaker 55 having
substantially the same output characteristics, localization close to that of a grand piano or the
like can be obtained without deteriorating the treble characteristics of the speakers.
[0026]
That is, in the above-described electronic keyboard instrument, the volume of the low frequency
range of the low frequency side speaker 53 is increased by the low frequency range cabinet 57,
so that localization near a grand piano or the like can be easily obtained.
[0027]
Further, since the low side speaker 53 and the high side speaker 55 having substantially the
same output characteristics are used as the speakers on the low side keyboard side and the high
side keyboard side, it is possible to obtain a good stereo effect in the middle to high range.
[0028]
Furthermore, since the progress of the sound waves emitted from the low-pitched speaker 53
and the high-pitched speaker 55 is blocked by the low-frequency cabinet 57, mutual effects of
the back sounds of the low-pitched speaker 53 and the high-pitched speaker 55 are reliably
prevented. be able to.
[0029]
In addition, even when the bass side speaker 53 and the treble side speaker 55 having
substantially the same output characteristics are used, it is not necessary to enlarge the
diaphragms 53a and 55a of the speakers, so that the treble characteristic of the speakers is
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deteriorated. It can be reliably avoided.
[0030]
Furthermore, since the speaker system can be constructed by the relatively small bass side
speaker 53 and the high tone side speaker 55, the manufacturing cost can be reduced.
[0031]
Further, in the above-mentioned electronic keyboard instrument, the volume is increased
centering on the bass of 50 Hz which is an important frequency generated by striking the middle
keyboard in the low range or a frequency near this, so it is closer to a grand piano etc. You can
get localization.
[0032]
FIG. 3 shows a second embodiment of the present invention. In this embodiment, the low side
speaker 53 is covered by a low range cabinet 57, and the high side speaker 55 is covered by the
high range cabinet 61. It is
[0033]
Also in this embodiment, substantially the same effect as that of the first embodiment can be
obtained. However, in this embodiment, since the high-pitched speaker 55 is covered by the highpitched cabinet 61, dust etc. can be produced on the high-pitched speaker 55. Can be prevented
from adhering.
[0034]
FIGS. 4 and 5 show a third embodiment of the present invention. In this embodiment, a cabinet
63 having a U-shaped cross section is disposed on the lower surface of the shelf plate 47 of the
main body case 31. FIG.
[0035]
The upper end opening of the cabinet 63 is in close contact with the lower surface of the shelf
plate 47, and both ends of the cabinet 63 are connected by a mounting member 65 to a pair of
side plates 35 supporting the both sides of the main body case 31.
[0036]
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On the bass keyboard side and the treble keyboard side of the cabinet 63, a bass side speaker 53
and a treble side speaker 55 having substantially the same output characteristics are disposed.
The diaphragms 53 a and 55 a of the low-pitched speaker 53 and the high-pitched speaker 55
are disposed to face the through holes 63 b and 63 c formed on the bottom surface 63 a of the
cabinet 63.
[0037]
The cabinet 63 is partitioned by a partition plate 67, and a bass keyboard side speaker room 69
for housing the bass speaker 53 is formed on the bass keyboard side, and a treble keyboard side
for housing the treble speaker 55 on the treble keyboard side. A speaker room 71 is formed.
[0038]
The volume V of the bass keyboard side speaker room 69 is a volume determined from the
equation described below.
V = 3.5 × 104 a4 / m 0 f 02 [(f C / f 0) 2-1] [m 3] Here, m 0 is the equivalent mass, a is the
effective vibration radius, f 0 is the lowest resonance frequency, and f c is the bass speaker 53 Is
the lowest resonance frequency when the speaker is mounted in the low tone keyboard side
speaker room 69.
[0039]
Also in this embodiment, the lowest resonance frequency f0 is a frequency around 50 Hz which
is a frequency generated by hitting an intermediate keyboard in the low tone range.
In the electronic keyboard instrument of this embodiment, since the cabinet 63 is divided by the
partition plate 67 to form the bass keyboard side speaker room 69, the volume of the bass region
of the bass side speaker 53 is increased by the bass keyboard side speaker room 69. While using
the bass side speaker 53 and the treble side speaker 55 having substantially the same output
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characteristics, localization close to that of a grand piano or the like can be obtained without
deteriorating the treble characteristics of the speakers.
[0040]
That is, in the above-described electronic keyboard instrument, the volume of the low frequency
range of the low frequency side speaker 53 is increased by the low frequency keyboard side
speaker room 69, so that localization near to a grand piano or the like can be easily obtained.
[0041]
Further, since the low side speaker 53 and the high side speaker 55 having substantially the
same output characteristics are used as the speakers on the low side keyboard side and the high
side keyboard side, it is possible to obtain a good stereo effect in the middle to high range.
[0042]
Furthermore, since the progress of the sound waves emitted from the low-pitched speaker 53
and the high-pitched speaker 55 is blocked by the partition plate 67, mutual influence by back
sounds of the low-pitched speaker 53 and the high-pitched speaker 55 can be reliably prevented.
it can.
[0043]
In addition, even when the bass side speaker 53 and the treble side speaker 55 having
substantially the same output characteristics are used, it is not necessary to enlarge the
diaphragms 53a and 55a of the speakers, so that the treble characteristic of the speakers is
deteriorated. It can be reliably avoided.
[0044]
Furthermore, since the speaker system can be constructed by the relatively small bass side
speaker 53 and the high tone side speaker 55, the manufacturing cost can be reduced.
[0045]
Further, in the above-mentioned electronic keyboard instrument, the volume is increased
centering on the bass of 50 Hz which is an important frequency generated by striking the middle
keyboard in the low range or a frequency near this, so it is closer to a grand piano etc. You can
get localization.
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[0046]
In the embodiment described above, an example is described in which the lowest resonance
frequency f0 is set to a frequency around 50 Hz, which is a frequency generated by hitting an
intermediate keyboard in the low tone range, but the present invention is limited to this
embodiment For example, the frequency may be set to 50 Hz to 200 Hz.
[0047]
Here, if the frequency is less than 50 Hz, the size of the cabinet 57 for the bass region becomes
large and not practical, while if it exceeds the frequency of 200 Hz, the effect obtained by the
conventional structure is close enough. You will not be able to get
[0048]
In the above-described embodiment, the present invention is applied to an electronic piano.
However, the present invention is not limited to such an embodiment and, of course, can be
widely applied to an electronic keyboard instrument such as an electronic organ. is there.
[0049]
As described above, according to the electronic keyboard instrument of claim 1, since the volume
of the bass region of the speaker on the bass keyboard side is increased by the bass region
cabinet, the bass keyboard having substantially the same output characteristics While using the
speakers on the side and the treble keyboard side, it is possible to obtain localization close to the
grand piano etc. without deteriorating the treble characteristic of the speakers, and with the bass
range cabinet, the speakers on the bass keyboard side and the treble keyboard side The mutual
influence by the back sound can be reliably prevented.
[0050]
In the electronic keyboard instrument according to claim 2, since the volume of the low range of
the speaker on the side of the bass keyboard is increased by the bass keyboard side speaker
room, the speakers on the side of the bass keyboard and the side of the treble keyboard having
substantially the same output characteristics are used While it is possible to obtain localization
close to the grand piano etc without deteriorating the treble characteristic of the speaker, and by
the partition plate, it is possible to reliably prevent mutual influence by the back sounds of the
speakers on the bass keyboard side and the treble keyboard side. .
[0051]
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In the electronic keyboard instrument according to claim 3, since the volume of the bass of the
frequency of 50 Hz to 200 Hz which is a frequency generated by hitting the keyboard in the bass
range is increased, localization closer to a grand piano etc. can be obtained. There is an
advantage.
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