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JP2005347964

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JP2005347964
PROBLEM TO BE SOLVED: To provide a speaker which is simple in construction, has superior
acoustic characteristics, and can emit a natural sound close to the sound played by a live
instrument. SOLUTION: The speaker according to the present invention comprises a diaphragm
mounting portion 9 and wood, and is provided with a diaphragm 8 mounted on the diaphragm
mounting portion 9 and a diaphragm 8 in a tensioned state. And a vibrator 11 for emitting a
sound by vibrating the diaphragm 8. The tension of the diaphragm 8 is applied, for example, by a
pressing unit 10 provided to press the diaphragm 8. [Selected figure] Figure 3
スピーカ
[0001]
The present invention relates to a speaker that is used for an independent speaker unit, an
electronic musical instrument, or the like to emit sound.
[0002]
A conventional general speaker emits a sound by vibrating its diaphragm.
It is desirable for the diaphragm to have a high propagation velocity and a moderate internal loss
as the applied vibration propagates therein. When the diaphragm has such vibration
characteristics, the listener usually recognizes the sound emitted from the speaker as being more
natural and incongruent. As a material having such vibration characteristics, wood is considered
11-05-2019
1
to be optimal, and as a speaker using wood for the diaphragm, for example, the one disclosed in
Patent Document 1 is known.
[0003]
The speaker system is disclosed by patent document 1, and this speaker system is comprised by
the box-shaped enclosure and the circular cone speaker arrange | positioned to the inside. A
circular cone speaker, like a normal cone speaker, has a truncated conical outer diaphragm, an
inner diaphragm mounted on the inner periphery, and an electromagnetic actuator for vibrating
these. There is. Moreover, in this patent document 1, both diaphragms are comprised by the thin
wood board, and the timbre of the performance sound emitted from this circular cone speaker by
having the outstanding vibration characteristic as mentioned above Can be brought close to the
timbre of the playing sound of a live instrument.
[0004]
The speaker system of Patent Document 1 described above has the following problems. That is,
the circular cone speaker is one in which kraft paper used as a soundboard in the existing coneshaped speaker is replaced with wood, and the other configuration basically follows that of the
normal cone-shaped speaker. Therefore, since the propagation velocity of the vibration radially
outward from the center of the speaker is equal in all directions, a standing wave is generated in
the diaphragm or a resonance phenomenon is generated between the diaphragm and the
enclosure. The sound characteristics of the speaker system may be adversely affected, and the
listener may feel discomfort in the emitted sound.
[0005]
The present invention has been made to solve the above problems, and is simple in construction,
has superior acoustic characteristics, and can emit natural sound close to that of a live
instrument. The purpose is to provide a speaker that can
[0006]
JP, 6-178386, A (pages 3, 4 and FIG. 3)
[0007]
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2
In order to achieve this object, the invention according to claim 1 of the present invention
comprises: a diaphragm attachment portion; and a diaphragm made of wood and attached to the
diaphragm attachment portion in a tensioned state; And a vibrator provided on the diaphragm
and configured to emit a sound by vibrating the diaphragm.
[0008]
According to this speaker, the diaphragm made of wood is attached to the diaphragm attachment
portion in a tensioned state.
In addition, a vibrator that generates sound by vibrating the diaphragm is provided on the
diaphragm.
According to the speaker having such a configuration, since the diaphragm is made of wood
having excellent vibration characteristics as described above, it is possible to emit a natural and
comfortable sound.
[0009]
In addition to being made of wood originally having excellent vibration characteristics, the
diaphragm is vibrated efficiently by the vibrator due to its tension.
Therefore, a loud loud sound can be emitted from the speaker. In addition, since the speaker is
very simple in construction as described above, noise can not be easily mixed in the sound to be
emitted, and excellent acoustic characteristics can be obtained, and maintenance can be easily
performed.
[0010]
The invention according to claim 2 of the present invention is characterized in that the speaker
according to claim 1 further includes a pressing portion provided to press the diaphragm to
apply tension to the diaphragm. I assume.
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3
[0011]
According to this speaker, the diaphragm is always maintained in a tensioned state by being
pressed by the pressing portion.
Therefore, the same effect as the speaker according to claim 1 described above can be obtained
with certainty.
[0012]
According to a third aspect of the present invention, in the speaker according to the first or
second aspect, the diaphragm is constituted by a plurality of diaphragms independent of each
other, and the vibrators are respectively provided on the plurality of diaphragms It is
characterized by
[0013]
The speaker has a plurality of diaphragms which are independent of each other, and vibrators
respectively provided on these diaphragms cause the respective diaphragms to vibrate
independently to generate a sound.
That is, by providing a plurality of diaphragms, for example, it is possible to set different
frequency characteristics for each diaphragm, and according to the sound to be emitted, the
frequency characteristics suitable for the sound By selectively vibrating the diaphragm having
the above or vibrating the plurality of diaphragms simultaneously, it is possible to emit the sound
of the high range from the low range in a well-balanced manner.
[0014]
The invention according to claim 4 of the present invention is characterized in that the
loudspeaker according to any one of claims 1 to 3 is incorporated in an electronic musical
instrument and emits a playing sound as the electronic musical instrument is played.
[0015]
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4
The speaker is used in a state of being incorporated in an electronic musical instrument, and
emits the playing sound as the electronic musical instrument is played.
As described above, this speaker has a very simple structure, and thus has some freedom in its
size and shape. Therefore, the electronic musical instrument can be relatively easily incorporated.
In addition, since the speaker has excellent acoustic characteristics, for example, when the
speaker is built in an electronic piano, the performance sound can be made closer to that of an
acoustic piano. It is possible to obtain an electronic musical instrument having a playing sound
closer to that of the musical instrument.
[0016]
According to a fifth aspect of the present invention, in the loudspeaker according to the fourth
aspect, the electronic musical instrument is an electronic keyboard instrument having a plurality
of keys, and the diaphragm is a bass range of the plurality of keys of the electronic keyboard
instrument. It is characterized in that it is disposed so as to extend between the high tone ranges
and has different vibration characteristics between the low tone range and the high tone range.
[0017]
The speaker is built in the electronic keyboard instrument, and its diaphragm is disposed so as to
extend between the low range and the high range of the electronic keyboard instrument.
Further, the bass side and the treble side of the diaphragm have different vibration
characteristics. According to such a configuration, depending on the range of the key pressed,
either the low frequency range side or the high frequency range side of the diaphragm is
vibrated, or both are vibrated, etc. By changing the frequency component of the sound to be
sounded, it is possible to change the performance sound, such as emphasizing the performance
sound in a specific range.
[0018]
The invention according to claim 6 of the present invention is characterized in that, in the
speaker according to any one of claims 1 to 3, it is incorporated in an independent speaker unit
or an audio reproduction device to emit sound.
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5
[0019]
The speaker is built in an independent speaker unit and emits sound when connected to various
devices or built in an audio reproduction device.
As described above, since this speaker has a certain degree of freedom in size and shape, it can
be used by being incorporated in various devices as well as an independent single speaker.
[0020]
Hereinafter, preferred embodiments of the present invention will be described with reference to
the drawings. 1-3 show a loudspeaker unit 2 comprising a loudspeaker 1 according to a first
embodiment of the invention. The speaker unit 2 is an independent type used in a state of being
connected to an audio reproduction device such as an electronic musical instrument or an audio
device (both not shown), and the speaker 1 and the case 3 etc. It is composed of
[0021]
The case 3 is in the form of a vertically long box open forward, and includes left and right side
plates 4, 4, a top plate 5, a bottom plate 6, a back plate 7, and the like. In the speaker 1, the
diaphragm 8, upper and lower two diaphragm attachment portions 9 and 9 for attaching the
diaphragm 8, and a diaphragm support rod 10 for applying a pseudo-excitation to be described
later to the diaphragm 8 ( For example, two electromagnetic actuators 11 and 11 (vibrator) for
emitting sound by vibrating the diaphragm 8 are configured.
[0022]
The diaphragm attachment portions 9 and 9 are fixed to the front end portions of the inner
surfaces of the top plate 5 and the bottom plate 6 of the case 3 respectively. Each diaphragm
mounting portion 9 is formed in a rod shape having a rectangular cross section, and extends in
the left-right direction. The diaphragm 8 is made of, for example, veneers of natural wood such
as Sitka spruce, spruce, German spruce, swiss pine, mahogany and the like. In addition, the
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diaphragm 8 is formed in a vertically long rectangular shape and has a predetermined thickness,
for example, a size in the range of 500 to 1500 mm in height, 50 to 500 mm in width, and 4 to
10 mm in thickness. There is. Such a diaphragm 8 is attached to the front of the upper and lower
diaphragm mounting parts 9 and 9 at its upper and lower ends, whereby the diaphragm 8 is
fitted into the opening of the case 3 and the appearance , Substantially covers the opening.
[0023]
The diaphragm support rod 10 is disposed at the center of the diaphragm 8 in the rear and in the
vertical direction, and extends across the left and right side plates 4, 4 and, for example, the left
and right side plates 4, 4 from the outside. Are fixed to the side plates 4, 4 by means of screws
(not shown) which are respectively screwed in. As shown in FIG. 3, the diaphragm support rod 10
has a curved front surface having a convex surface shape, and such a front surface is disposed to
press the rear surface of the diaphragm 8. The diaphragm 8 is bent forward by pressing by the
diaphragm support rod 10, and the amount of deflection near the center is, for example, about 1
to 10 mm with respect to the planar state when there is no pressing. As a result, the entire
diaphragm 8 is formed in a curved surface shape slightly convex in the front similar to the mucus
formed on the sound board of the grand piano. The tension is always acting (tensioned). The
tension of the diaphragm 8 in this case is determined according to the relative positional
relationship between the diaphragm support rod 10 and the diaphragm attachment portions 9, 9
in the front-rear direction.
[0024]
In addition, it may replace with the diaphragm support rod 10, and as shown in FIG. 4, you may
use the diaphragm support rod 12 (pressing part) by a modification. The diaphragm support rod
12 is also disposed at the center of the diaphragm 8 in the vertical direction, and the support rod
main body 13 extending across the left and right side plates 4, 4 and the support rod main body
13 in the left-right direction (FIG. A plurality of recessed portions 13a (only one is shown) formed
to be aligned in the depth direction) and a plurality of springs 14 (only one shown) which are
accommodated in the respective recessed portions 13a and project forward. According to such a
diaphragm support rod 12, the diaphragm 8 is urged forward by the plurality of springs 14,
thereby causing the diaphragm 8 to have a false curl as in the case of the diaphragm support rod
10. Tension is maintained throughout.
[0025]
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7
As described above, since the opening of the case 3 is covered by the diaphragm 8, the finish of
the diaphragm 8 largely affects the appearance of the speaker unit 2. Therefore, the front surface
of the diaphragm 8 is provided with a cosmetic finish, for example, by painting. Further, in the
case where the diaphragm 8 is not subjected to the cosmetic finish, for example, the front part of
the speaker unit 2 is covered with the saran net 15, for example, so that the appearance can be
adjusted (see FIG. 3).
[0026]
The electromagnetic actuators (hereinafter simply referred to as “actuators”) 11 and 11 are
attached to the rear surface of the diaphragm 8. Each actuator 11 has a known configuration, for
example, an impedance of 8Ω, a rated input of 20 W, and a diameter of about 90 mm. When
such an actuator 11 is attached, it is confirmed that it is acoustically preferable to arrange the
actuator 11 from the end in the lengthwise direction of the diaphragm 8 at a position of about
1⁄6 to 1⁄3 of the length thereof. . For this reason, in the present embodiment, the actuators 11
are respectively disposed at positions 1/6 of the height from the upper end and the lower end of
the diaphragm 8. In addition, such actuators 11 are driven by inputting a signal generated by an
electronic musical instrument or the like connected to the speaker unit 2 and vibrate the
diaphragm 8 according to the signal. Thereby, the sound according to the signal is emitted from
the diaphragm 8.
[0027]
5A shows the frequency characteristic of the actuator 11 of the speaker 1 described above, and
FIG. 5B shows the frequency characteristic of the diaphragm 8 respectively. According to this, the
frequency characteristics of the diaphragm 8 and the actuator 11 are particularly well
approximated in a frequency range higher than around 20 Hz, which is generally considered as
the lower limit of the audible range of the human ear. That is, in the process of converting the
signal input to the actuator 11 into sound, the speaker 1 substantially faithfully reproduces the
sound to be emitted represented by the input signal with substantially no deterioration in
frequency characteristics. it can.
[0028]
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8
According to the speaker unit 2 as described above, since the diaphragm 8 is made of natural
wood having excellent vibration characteristics, it is possible to emit natural and natural sound.
In addition to the fact that the diaphragm 8 is made of wood and is pressed by the diaphragm
support rod 10, a pseudo-muscle is formed on the diaphragm 8 to ensure that it always has
tension. Be done. Thereby, the diaphragm 8 is efficiently vibrated by the actuators 11 and 11.
Therefore, a loud loud sound can be emitted from the speaker 1. Further, since the speaker 1 has
a very simple structure as described above, it is difficult for noise to be mixed in the sound to be
emitted, and excellent acoustic characteristics can be obtained. In addition, maintenance can be
easily performed for the same reason.
[0029]
6 and 7 show a loudspeaker unit 20 according to a second embodiment of the invention. The
speaker unit 20 has a configuration similar to the speaker unit 2 according to the first
embodiment described above, and incorporates a speaker 21 described later instead of the
speaker 1. Hereinafter, the same components as those of the speaker unit 2 are denoted by the
same reference numerals, and differences from the speaker unit 2 will be mainly described.
[0030]
The case 3 of the speaker unit 20 has the same configuration as the case 3 of the speaker unit 2
described above, and a partition plate 22 is provided inside thereof. The partition plate 22 is
disposed near the top plate 5 between the top plate 5 and the bottom plate 6, whereby the
internal space of the case 3 is divided into two upper and lower spaces. The speaker 21 is
configured by an upper speaker 21 a and a lower speaker 21 b, and these are respectively
disposed in upper and lower spaces in the case 3.
[0031]
The upper speaker 21a and the lower speaker 21b have substantially the same configuration as
each other, and respectively have diaphragms 23a and 23b for high frequency range and low
frequency range. The diaphragms 23a and 23b are both made of the same material as the
diaphragm 8 of the speaker 1 of the first embodiment, and the upper diaphragm 23a is formed
shorter and thinner than the lower diaphragm 23b. Thus, both 23a and 23b have different
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frequency characteristics. That is, the upper high-pitched diaphragm 23a mainly emits the highpitched sound, and the lower low-pitched diaphragm 23b mainly emits the low-pitched sound.
[0032]
In addition, the upper and lower two diaphragm attachment parts 9 are fixed to the partition
plate 22 so as to sandwich the partition plate 22 between them, and the diaphragm attachment
part 9 is also fixed to the inner surface of the top plate 5 and the bottom plate 6 respectively. It is
done. The two diaphragms 23a and 23b are respectively attached to the diaphragm attachment
portions 9 and 9 in the upper and lower spaces. As a result, the upper and lower openings of the
case 3 are substantially covered by the diaphragms 23a and 23b. Although not shown, similarly
to the diaphragm support rod 10 of the speaker 1 described above, a diaphragm support rod for
pressing the diaphragms 23a and 23b is provided behind the diaphragms 23a and 23b. Pseudomuscles are formed on 23a and 23b.
[0033]
The actuators 11, 11 are attached to the rear surfaces of the diaphragms 23a, 23b, respectively.
Specifically, for the same reason as the case of the first embodiment described above, the
actuators 11 and 11 are respectively located at 1/6 of the height from the upper end of the
diaphragm 23a and the lower end of the diaphragm 23b. It is arranged. Further, as in the case of
the speaker unit 2, the appearance of the speaker unit 20 can be obtained by covering the front
of the speaker unit 20 with, for example, the saran net 15 as necessary, for example, when the
diaphragms 23 a and 23 b are not finished with a cosmetic finish. Are prepared (see FIG. 7).
[0034]
According to the speaker unit 22 as described above, since the speaker 21 has the diaphragms
23a and 23b having different frequency characteristics, the signal for the high frequency range
is used as the upper actuator 11 for the low frequency range. Depending on the range of the
sound to be emitted, either one of the diaphragms 23a and 23b is selectively vibrated or both the
diaphragms 23a and 23b are vibrated simultaneously, such as inputting a signal to the lower
actuator 11 or the like. can do. As a result, the overall volume can be increased, and the sound
from the low range to the high range can be emitted in a balanced manner.
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10
[0035]
Figures 8 and 9 show a loudspeaker unit 30 according to a third embodiment of the invention.
The speaker unit 30 basically has a configuration similar to the above-described speaker units 2
and 20, and the same components will be described with the same reference numerals as the
speaker units 2 and 20.
[0036]
The speaker unit 30 is configured of a speaker 31 and a case 32 incorporating the same. The
case 32 is configured substantially the same as the case 3 described above, and includes left and
right side plates 33, 33, a top plate 34, a bottom plate 35, a back plate 36, etc. .
[0037]
The high and low range diaphragms 23a and 23b of the speaker 31 are configured in the same
manner as the diaphragms 23a and 23b of the speaker 21 of the second embodiment described
above, and have the same size, but these are in the front-rear direction Lined up. The speaker 31
also has two diaphragm attachment portions 9 and 39 for attaching the diaphragms 23a and
23b, and actuators 11 and 11 attached to the diaphragms 23a and 23b, respectively.
[0038]
The diaphragm attachment portions 9, 9 for attaching the front low-range diaphragm 23b are
fixed to the front of the inner surface of the top plate 34 and the bottom plate 35, and the
diaphragms 23b are provided at their upper and lower ends. It is attached to the front. In
addition, the diaphragm attachment portions 39, 39 for attaching the diaphragm 23a for the
high-frequency band on the rear side have a predetermined distance behind the upper and lower
diaphragm attachment portions 9, 9, and the top plate 34 and the bottom plate 35. From the top
to the bottom, and is fixed between the left and right side plates 33, 33. Each diaphragm
attachment portion 39 is formed to have a rectangular cross section and a depth smaller than
that of the diaphragm attachment portion 9 of the second embodiment, and the diaphragms 23a
are attached to their front surfaces at the upper and lower end portions. There is. Further,
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although not shown, in the same manner as in the first and second embodiments described
above, a diaphragm support bar for pressing these is provided on the rear surface of both
diaphragms 23a and 23b, whereby the diaphragm 23a is provided. , 23b is formed with a
pseudo-muscle.
[0039]
Further, the actuators 11, 11 are attached to the rear surfaces of the diaphragms 23a, 23b as in
the second embodiment described above, and for the reasons described above, the heights of the
respective actuators are high from the upper ends of the diaphragms 23a, 23b. Are each
arranged at a position of 1/6. In addition, as in the case of the speaker units 2 and 20, the
appearance of the speaker unit 30 can be obtained by covering the front portion of the speaker
unit 30 with, for example, the saran net 15 if necessary. Are prepared (see FIG. 9).
[0040]
According to the speaker unit 30 including the speaker 31 as described above, in addition to the
effect of the speaker unit 20 according to the second embodiment, the diaphragms 23a and 23b
are arranged in the front-rear direction, so that the diaphragm 23a is arranged. In particular, the
height can be reduced by the amount of disposing the speaker 23b behind the diaphragm 23b,
and the speaker unit 30 as a whole can be configured more compactly.
[0041]
FIG. 10 shows an electronic piano 40 (electronic keyboard instrument) incorporating a speaker
unit of the same type as the speaker unit 2 described above.
The electronic piano 40 includes a piano body 41, a keyboard device 42 provided in the piano
body 41, a speaker unit 2 built in the piano body 41, and the like.
[0042]
The keyboard device 42 has a keyboard 42a composed of a large number of keys arranged in the
left and right direction, and the key switch provided for each key is a speaker unit via an
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12
electronic board (not shown) or the like. Connected to 2. The speaker unit 2 is disposed above
the keyboard device 42, and the diaphragm 8 is located on the upper side and extends in the leftright direction, and the diaphragm support rod 10 is disposed to extend in the front-rear
direction. In addition, the speaker unit 2 extends substantially in the entire left-right direction of
the piano body 41, whereby the diaphragm 8 extends from the low tone range to the high tone
range of the keyboard 42a.
[0043]
According to such a configuration, when a key is depressed, key depression information is
detected by the key switch corresponding to the key, and a sound generation signal is generated
by the electronic board according to the detected key depression information. Then, when the
sound generation signal is input to the speaker unit 2, the diaphragm 11 is vibrated by driving
the actuators 11 and 11 according to the level and the waveform of the sound generation signal,
and the performance sound is emitted. .
[0044]
According to the electronic piano 40 as described above, since the speaker 1 has excellent
frequency characteristics, the playing sound can be made closer to the playing sound of the
acoustic piano. In addition, since the speaker unit 2 has a very simple configuration, it has a
certain degree of freedom in its size and shape. It can be set according to the shape and can be
incorporated into the electronic piano 40 relatively easily.
[0045]
FIG. 11 shows a first modification of the diaphragm 8 of the speaker unit 2 incorporated in the
electronic piano 40 described above. The diaphragm 50 of this modification is obtained by
pasting the sheets 51, 51 of carbon fiber so as to cover both surfaces of the right end portion,
that is, the portion corresponding to the high range side of the keyboard 41a. It is divided into
the sheet sticking part 50a which stuck 51, and the sheet non-sticking part 50b which is not
sticking. Thereby, the frequency characteristics of the diaphragm 50 are set to be different
between the sheet bonding unit 50a and the sheet non-bonding unit 50b.
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13
[0046]
Further, the diaphragm 50 is also provided with two left and right actuators 11 and 11.
Specifically, the actuator 11 on the right side is at a position 1/6 left of the length in the left-right
direction of the sheet affixing portion 50a from the right end of the diaphragm 50, and the
actuator 11 on the left side is from the left end of the diaphragm 50 The sheet non-sticking
portion 50b is attached at a position 1/6 right of the length in the left-right direction.
[0047]
When such a diaphragm 50 is used for the electronic piano 40 in place of the diaphragm 8 of the
speaker unit 2, when the diaphragm 50 is vibrated by the actuator 11 on the right side, the sheet
sticking section 50a emits sound The treble component of the sound is increased. As a result, the
electronic piano 40 can emit particularly metallic and clear sound, and can play with a
performance sound in which the high-pitched sound is emphasized. In addition, when the key in
the low to middle range is depressed, when the key in the high range is depressed centering on
the sheet non-attaching portion 50b located in the low to mid range, it is vibrated centering on
the sheet attaching portion 50a. The acoustic balance between low and high tones similar to an
acoustic piano can be obtained, and it is possible to play with a sense similar to that of an
acoustic piano.
[0048]
FIG. 12 shows a second modification of the diaphragm of the speaker unit 2. The diaphragm 52
of this modification follows the shape of the soundboard of the grand piano, and the length in the
front-rear direction is formed in a tapered shape toward the high-pitch range side. Thus, the
frequency characteristic of the diaphragm 52 changes from the low tone range to the high tone
range. Therefore, in the electronic piano 40 using the diaphragm 52, the playing sound is
emitted in a balanced manner over the low tone range can do.
[0049]
In addition, this invention can be implemented in various aspects, without being limited to each
embodiment mentioned above. For example, the frequency characteristics, number, and
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14
arrangement of the actuators for vibrating the diaphragm depend on the shape, size, etc. of the
diaphragm, and when a plurality of diaphragms are provided, the sound emitted from them It can
be set appropriately according to the acoustic balance of Further, when a plurality of actuators
are provided, their frequency characteristics may be made different from each other, whereby
resonance between diaphragms can be prevented.
[0050]
In addition, although the electronic piano 40 described above is an example in which the same
type as the speaker unit 2 is incorporated in the piano main body 41, without being limited to
this, the speaker unit 20 of the second and third embodiments, The same type as any of the 30
may be incorporated. Also, although the electronic piano 40 is an example in which one speaker
unit 2 is incorporated above the keyboard device 42, the invention is not limited thereto. For
example, the speaker unit 2 may be located below or both the keyboard device 42. It may be
arranged. In that case, the speaker units of the respective embodiments may be combined to
incorporate a plurality of speaker units of different types.
[0051]
Further, in the diaphragm 52 of the second modified example of the diaphragm 8, the frequency
characteristic is changed from the low tone range to the high tone range of the keyboard 42a by
changing the length in the front-rear direction in a tapered shape. For example, the frequency
characteristics may be changed by changing the thickness. Furthermore, in the embodiment, the
example in which the speaker according to the present invention is incorporated into an
electronic piano has been described, but of course it may be incorporated into another type of
electronic musical instrument or audio reproduction device. In addition, the configuration of the
details can be changed as appropriate within the scope of the present invention.
[0052]
It is a perspective view showing a speaker unit containing a speaker by a 1st embodiment of the
present invention. It is a front view of the speaker unit of FIG. It is sectional drawing in alignment
with line AA of FIG. It is the elements on larger scale which show the modification of the
diaphragm support rod of FIG. In the speaker of FIG. 1, a is a diagram showing the frequency
characteristics of the actuator and b is the diaphragm. It is a front view showing a speaker unit
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15
containing a speaker by a 2nd embodiment of the present invention. It is sectional drawing in
alignment with line B-B of FIG. It is a front view which shows the speaker unit containing the
speaker by 3rd Embodiment of this invention. It is sectional drawing in alignment with line CC of
FIG. It is a perspective view which shows the electronic piano incorporating the speaker unit of
FIG. It is a 1st modification of the diaphragm of the speaker of FIG. 10, and (a) Top view and (b)
Side view are shown with an actuator. It is a top view which shows the 2nd modification of the
diaphragm of the speaker of FIG. 10 with an actuator.
Explanation of sign
[0053]
DESCRIPTION OF SYMBOLS 1 speaker 8 diaphragm 9 diaphragm attachment part 10 diaphragm
support rod (press part) 11 electromagnetic actuator (vibrator) 12 diaphragm support rod (press
part) 21 speaker 23a diaphragm 23b diaphragm 31 speaker 39 diaphragm attachment Part 40
Electronic piano (electronic musical instrument) 42 Keyboard device 50 Vibrator plate 52
Vibrator plate
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