JP2020016670A - Electronic keyboard musical instrument - Google Patents

Abstract

To provide an electronic keyboard musical instrument capable of emitting substantially acoustic sound without damaging a design of the whole musical instrument.SOLUTION: An electronic keyboard musical instrument comprises: a musical instrument housing 2; a keyboard 11 arranged in the front of the musical instrument housing 2; a sound source for supplying an electric signal in accordance with operation of the keyboard 11; a right diaphragm 16 and a left diaphragm 17, which are exterior surfaces and are disposed as parts of a top plate 10a of a roof plate 10 of the musical instrument housing 2; and a right transducer and a left transducer, which are installed at rear faces of the respective diaphragms 16 and 17. Each transducer generates vibration corresponding to the electric signal supplied from the sound source and transmits the vibration to each corresponding diaphragm from the rear faces. Thus, each diaphragm vibrates to emit sound corresponding to the electric signal.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an electronic keyboard instrument that converts an electric signal supplied from a sound source into a sound in accordance with operation of a keyboard, and in particular, emits a realistic sound by emitting sound from the exterior of the instrument housing instead of using a cone speaker. The present invention relates to an electronic keyboard instrument capable of reproducing the same.

  Conventionally, as an electronic keyboard instrument using a substitute for a cone speaker of this type, a musical instrument housing accommodating a keyboard, a sound source device, and a loudspeaker, and a shelf board disposed at the bottom of the musical instrument housing And a vibrator fixed to the lower surface of the shelf board are known. The sound source device outputs an electric signal based on a performance on a keyboard, the electric signal is amplified by an amplifier, and the amplified electric signal is supplied to a vibrator. Then, the shaker vibrates the shelf, and the shelf emits sound as a soundboard (Patent Document 1).

JP 2008-292738 A (abstract, FIG. 1).

However, the above-described conventional electronic keyboard instrument uses an idea based on the principle that the string vibration of the acoustic instrument is transmitted to the instrument housing and the instrument housing vibrates to produce sound. Because of the structure in which the cabinet of the electronic keyboard instrument which does not vibrate does not vibrate, it is difficult to emit a realistic sound.
In particular, it was difficult to reproduce high-range sounds on a thick shelf. Furthermore, since the vibrator is fixed to the lower surface of the shelf, it has been difficult to deliver high-pitched sounds to the player.
In addition, a configuration in which a cone speaker that emits high-frequency sound is externally attached to the instrument housing has also been conventionally used, but if it is desired to imitate the design of an acoustic instrument, this cone speaker is located at a position where it can be observed. That impairs the overall design of the instrument. On the other hand, if the cone speaker is provided inside the housing of the musical instrument and a tone escape (hole) is provided to emit the sound to the outside, the sound is not directly emitted. Quality had been impaired.

  Therefore, the present invention has been proposed to solve the above problems, and it is an object of the present invention to provide an electronic keyboard instrument capable of emitting a realistic sound without damaging the design of the entire instrument. Aim.

  In order to achieve the above-described object, an electronic keyboard instrument according to the present invention includes a musical instrument housing, a keyboard disposed at a front portion of the musical instrument housing, and a sound source that supplies an electric signal in accordance with operation of the keyboard. A vibration plate constituting a part of the exterior surface of the instrument housing, and a vibration generation unit provided on the back surface of the vibration plate, wherein the vibration generation unit vibrates according to an electric signal supplied from a sound source. Is generated, and the vibration is transmitted to the diaphragm from the back surface, and the diaphragm vibrates due to the vibration transmitted from the vibration generating unit, and emits a sound corresponding to an electric signal.

As described above, the electronic keyboard musical instrument of the invention according to the present application has a diaphragm that emits a sound corresponding to an electric signal provided as a part of the exterior surface of the musical instrument housing. Real sound can be emitted without deteriorating the sound quality.
Moreover, since the diaphragm vibrates on the surface, the sound is less attenuated according to the distance from the sound source than the point sound source, so that the sound can be efficiently delivered to the player or the audience.

The second feature of the electronic keyboard instrument of the invention according to the present application is that the exterior surface of which the diaphragm forms a part is the upper surface of the roof plate.
That is, since sound is emitted from the diaphragm provided as a part of the upper surface of the roof shingle, it is possible to emit sound with a wide spread.
Moreover, there is no need to form a tone escape on the instrument housing.

The third feature of the electronic keyboard instrument of the invention according to the present application is that the exterior surface of which the diaphragm constitutes a part is a surface facing the player.
That is, since the sound is emitted from the diaphragm provided as a part of the surface facing the player, there is no need to emit the sound via tone escape, and the sound can be efficiently delivered to the player or the audience.
Moreover, there is no need to form a tone escape on the instrument housing.

Further, in the electronic keyboard instrument of the invention according to this application, the instrument housing includes a keyboard cover that covers the keyboard, the keyboard cover has a structure that opens and closes with the rear end as a rotation axis, and the diaphragm has a part. The fourth feature is that the exterior surface to be configured is a surface facing the player when the keyboard cover is open.
That is, since the sound is emitted from the diaphragm provided as a part of the surface (the back surface of the keyboard cover) facing the player when the keyboard cover is open, it is not necessary to emit the sound via tone escape. Can be efficiently delivered to the player.
Moreover, there is no need to form a tone escape on the instrument housing.

A fifth feature of the electronic keyboard instrument of the invention according to the present application is that the diaphragm has a thin outer surface.
That is, since the diaphragm is formed by using a part of the outer surface of the instrument housing, the boundary line between the diaphragm and the outer surface of the instrument housing cannot be seen from the outside, and the existence of the diaphragm cannot be recognized at all. Therefore, the external design of the instrument is not impaired at all.

The sixth feature of the electronic keyboard instrument of the invention according to the present application is that an opening is formed in the exterior surface and the diaphragm is provided to cover the opening.
Therefore, since the diaphragm can be formed of a material different from that of the exterior surface, the tone can be changed by selecting the material.

The seventh feature of the electronic keyboard instrument of the invention according to the present application is that the exterior surface is formed of wood, and the diaphragm is formed of a material having higher acoustic impedance than wood.
Therefore, a realistic sound can be emitted from the diaphragm.

The eighth feature of the electronic keyboard instrument of the invention according to the present application is that the surface of the diaphragm is covered with a film having the same design as that of the periphery.
Therefore, the appearance of the diaphragm is difficult to understand from the appearance, and the appearance design of the musical instrument is not spoiled.

A ninth feature of the electronic keyboard instrument of the invention according to the present application is that a mounting member is attached to the back surface of the diaphragm across the diaphragm, and the vibration generating section is mounted to the mounting member. And
Therefore, the rigidity of the mounting portion of the vibration generating section can be increased, and the vibration generated by the vibration generating section can be efficiently transmitted to the diaphragm, so that a realistic sound can be emitted.

The tenth feature of the electronic keyboard instrument of the invention according to the present application is that the diaphragm emits a sound in a high frequency range.
Therefore, it is possible to emit a high-pitched sound with a realistic spread without externally attaching a speaker that emits a high-pitched sound.

  By implementing the electronic keyboard instrument of the invention according to this application, it is possible to emit a realistic sound without damaging the design of the entire instrument.

It is a perspective view of the electronic keyboard musical instrument concerning a 1st embodiment. FIG. 2 is an explanatory diagram showing a mounting structure of a diaphragm mounted on the electronic keyboard instrument shown in FIG. 1. FIG. 3 is an explanatory view of the structure for mounting the diaphragm shown in FIG. FIG. 2 is an explanatory diagram showing, in blocks, a main electrical configuration of the electronic keyboard instrument shown in FIG. 1. It is a front view showing the state where the electronic keyboard instrument concerning a 2nd embodiment opened a keyboard cover. 6A is a right side view of the electronic keyboard instrument shown in FIG. 5, and FIG. 6B is an enlarged view of the keyboard lid shown in FIG.

<First embodiment>
[Schematic Configuration of Electronic Keyboard Instrument 1]
A schematic configuration of an electronic keyboard instrument 1 according to a first embodiment of the present invention will be described with reference to FIG. FIG. 1 is a perspective view of an electronic keyboard instrument 1 according to this embodiment. In the following description, the side closer to the player of the electronic keyboard instrument 1 is called the front or the front, and the opposite direction is called the rear or the rear.

  The electronic keyboard instrument 1 includes an instrument housing 2, a keyboard 11 disposed in front of the instrument housing 2, a soft pedal 13, a muffler pedal 14, a damper pedal 15, a right diaphragm 16, and a left vibration It includes a plate 17, a right speaker 22 (FIG. 4), and a left speaker 23 (FIG. 4). The musical instrument housing 2 includes a right master plate 3, a left master plate 4, a right leg 5, a left leg 6, a shelf plate 7, an upper front plate 8, a lower front plate 9, a roof plate 10, A music stand 12 is provided. Of the right main plate 3, the left main plate 4, the right leg 5, the left leg 6, the shelf plate 7, the upper front plate 8, the lower front plate 9, the roof plate 10, and the music stand 12, a portion that can be seen from outside is a musical instrument case. Configure the exterior surface of the body. Hereinafter, in the case where items common to the right diaphragm 16 and the left diaphragm 17 are described, they may be simply referred to as diaphragms. In addition, when explaining items common to the right speaker 22 and the left speaker 23, they may be simply referred to as speakers.

A shelf plate 7 is mounted between a right master plate 3 arranged on the right side of the instrument housing 2 and a left master plate 4 arranged on the left side, and a keyboard 11 is provided on the upper surface of the shelf plate 7. Installed. A right leg 5 is formed at a front portion of the right master plate 3, and a left leg 6 is formed at a front portion of the left master plate 4. A lower front plate 9 is mounted between the right master plate 3 and the left master plate 4 and at the rear of the lower surface of the shelf plate 7. Below the lower front plate 9, a soft pedal 13, a muffler pedal 14, and a damper pedal 15 are arranged in a form projecting forward. An upper front plate 8 is mounted between the right main plate 3 and the left main plate 4 and behind the keyboard 11. A front surface 8a of the upper front plate 8, which is an exterior surface, faces a player who plays in front of the electronic keyboard instrument 1. A roof panel 10 is mounted above the upper front panel 8 and between upper ends of the right main panel 3 and the left main panel 4. A music stand 12 is attached to the center of the shingle 10. In FIG. 1, the music stand 12 is in a folded state, but can be changed to an upright posture with its lower end as a rotation axis.
On the roof plate 10, a square right diaphragm 16 is provided on the right side of the music stand 12, and on the left side of the music stand 12, a square left diaphragm 17 is provided. The right diaphragm 16 and the left diaphragm 17 are each provided as a part of the upper surface 10a of the roof plate 10, which is an exterior surface.

[Diaphragm mounting structure]
Here, the mounting structure of each of the diaphragms 16 and 17 will be described with reference to FIGS.
FIG. 2 is an explanatory diagram showing a mounting structure of the diaphragm attached to the electronic keyboard instrument 1 shown in FIG. 1, and FIG. 3 is an explanatory diagram showing the mounting structure of the diaphragm shown in FIG. is there. Hereinafter, in the case where matters common to the right transducer 18 and the left transducer 19 (FIG. 4) are described, they may be simply referred to as transducers.

  As shown in FIG. 2, a rectangular opening 10 b is formed to the left of the upper surface 10 a of the roof panel 10, which is an exterior surface, and a left opening is formed between the opening 10 b and the upper surface 10 a. A step 10c for attaching the diaphragm 17 (FIG. 1) is formed. The step portion 10 c is formed at a step that matches the thickness of the left diaphragm 17. The shape drawn by the boundary between the upper end edge of the step portion 10c and the upper surface 10a of the roof plate 10 is a square that matches the shape of the left diaphragm 17, and the outer peripheral wall of the left diaphragm 17 is the inner peripheral wall of the step portion 10c. Is housed in Screw insertion holes (not shown) for inserting the same countersunk screws 29 as the countersunk screws 29 to which the right vibration plate 16 is attached are formed through a plurality of places such as the four corners of the left diaphragm 17. A recessed portion (not shown) is formed around the upper edge of the screw insertion hole so as to match the shape of the head of the flathead screw 29.

  The left diaphragm 17 is attached to the step 10c so as to cover the opening 10b by screwing each flathead screw 29 inserted into each screw insertion hole into the bottom wall of the step 10c. The head of the countersunk screw 29 is housed in the recess, and does not protrude from the upper surface of the left diaphragm 17. Therefore, the upper surface of the left diaphragm 17 attached to the step portion 10c is flush with the upper surface 10a of the roof plate 10. The upper surface of the left diaphragm 17 is covered with a film having the same design (color, color, pattern, etc.) provided on the upper surface 10a of the roof panel 10, so that the presence of the left diaphragm 17 is difficult to understand in appearance. It is devised. The right diaphragm 16 is also mounted on the right side of the roof panel 10 by the same mounting structure as the left diaphragm 17, and its upper surface is covered with a film of the above design. The film covering each of the vibration plates 16 and 17 may be formed by painting, or may be formed by sticking a resin film.

  As shown in FIG. 3, a metal mounting stay 20 is fixed to the right (left side in FIG. 3) of the back surface 10 d of the roof plate 10 so as to straddle the back surface of the right diaphragm 16. The right transducer 18 is fixed to an upper surface of the mounting stay 20. A network circuit (not shown) for cutting a specific frequency band is electrically connected to the right transducer 18, and the network circuit is connected to an amplifier 26 (via a connection cable 21 attached to the back surface 10 d of the roof panel 10). FIG. 4). The right transducer 18 is an actuator that converts an electric signal supplied from the amplifier 26 into vibration, and includes a movable body that generates vibration. The right transducer 18 is fixed to the mounting stay 20 so that the head of the movable body that moves forward and backward strikes the back surface of the right diaphragm 16. The right transducer 18 causes the movable body to move forward and backward according to an electric signal supplied from the amplifier 26 (FIG. 4), and vibrates the right diaphragm 16. Thereby, a sound corresponding to the electric signal is emitted from the right diaphragm 16. A left transducer 19 (FIG. 4) is mounted on the back surface of the left diaphragm 17 with the same mounting structure as the right transducer 18, and the left diaphragm 17 is vibrated by the left transducer 19 to emit sound.

In this embodiment, the musical instrument housing 2 is formed of wood, and the right diaphragm 16 and the left diaphragm 17 are formed of a material having a higher acoustic impedance than wood, for example, iron, in a rectangular shape. It is formed in a plate shape thinner than the plate 10 and the shelf plate 7. Here, the acoustic impedance is a pressure necessary for vibrating air at a unit speed, that is, a resistance value relating to sound, and an approximate value thereof can be obtained by a sound speed × a material density. A material having a higher acoustic impedance can emit a realistic high sound due to vibration. For example, the acoustic impedance of glass is larger than that of wood, and metal such as iron is larger than glass. Therefore, if the diaphragm is formed of a metal such as iron as in this embodiment, a realistic high sound can be emitted from the diaphragm.
The right transducer 18 and the left transducer 19 are voice coil type actuators each including a magnet, a voice coil, and a movable body, and are also referred to as a vibrator. The cutoff frequencies of the right transducer 18 and the left transducer 19 are each 6,500 Hz, which are set higher than the fundamental tone of the highest key of the acoustic piano, 4,000 Hz. It can give a sense of transparency and air. The right speaker 22 and the left speaker 23 (FIG. 4) are full-range speakers, respectively, and each of the diaphragms 16 and 17 plays a role of a tweeter that emits high-range sound.

[Electrical composition of electronic keyboard instruments]
Next, the main electrical configuration of the electronic keyboard instrument 1 will be described with reference to FIG.

  The electronic keyboard instrument 1 includes a sensor 27, a sound source data storage unit 24, an electric signal generation unit 25, an amplifier 26, a right speaker 22, a left speaker 23, a right transducer 18, and a left transducer 19. The sensor 27 detects an operation of the keyboard 11 and outputs a detection signal to the electric signal generation unit 25. The sound source data storage unit 24 stores sound source data for emitting a sound corresponding to each key of the keyboard 11, which is a sampled sound actually emitted when each key of the acoustic piano is operated. Data is stored in a readable manner. The electric signal generation unit 25 reads out the sound source data corresponding to the detection signal output from the sensor 27 from the sound source data storage unit 24, converts the read sound source data into left and right two-channel analog electric signals, and outputs the converted signals to the amplifier 26. Output. The amplifier 26 amplifies the electric signal output from the electric signal generating unit 25, outputs the amplified right channel electric signal to the right speaker 22 and the right transducer 18, and outputs the amplified left channel electric signal to the left speaker 23. And to the left transducer 19.

Then, the right transducer 18 generates vibration in accordance with the electric signal of the right channel output from the amplifier 26, transmits the vibration to the right diaphragm 16 from the back surface, and the right diaphragm 16 vibrates and emits sound. . Further, the left transducer 19 generates vibration in accordance with the electric signal of the left channel output from the amplifier 26, transmits the vibration to the left diaphragm 17 from the back surface, and the left diaphragm 17 vibrates and emits sound. .
That is, each of the transducers 18 and 19 generates vibration according to the electric signal supplied from the amplifier 26, and transmits the vibration to each of the diaphragms 16 and 17 from the back surface. Then, each of the diaphragms 16 and 17 vibrates, and emits a sound corresponding to the electric signal.

[Effects of First Embodiment]
(1) If the electronic keyboard instrument 1 according to the first embodiment described above is implemented, each of the diaphragms 16 and 17 that emits a sound corresponding to an electric signal constitutes an exterior surface of the instrument housing 2. Since it is provided as a part of the upper surface 10a of the instrument 10, it is possible to emit realistic high-range sounds without deteriorating the design of the entire musical instrument.
In addition, since each of the diaphragms 16 and 17 vibrates in a plane, the sound attenuation according to the distance from the sound source is smaller than that of the point sound source, so that high-range sound can be efficiently delivered to a player or an audience. .

(2) Moreover, since the sound is emitted from the upper surface 10a of the roof panel 10, which is the exterior surface, it is possible to emit sound in a wide high-frequency range.
Moreover, it is not necessary to form a tone escape on the musical instrument housing 2.
(3) Further, since each of the diaphragms 16 and 17 can be formed of a material different from that of the musical instrument housing 2, the timbre can be changed by selecting the material.

(4) Further, the exterior surface of the instrument housing 2 is formed of wood, and the respective diaphragms 16 and 17 are formed of a material having higher acoustic impedance than wood, so that the respective diaphragms 16 and 17 are real. It can emit a high-pitched sound.
(5) Further, since the surfaces of the respective diaphragms 16 and 17 are covered with a film having the same design as the surroundings, the existence of the respective diaphragms 16 and 17 is difficult to understand, so that the design of the musical instrument is not spoiled.

(6) Further, metal mounting stays 20 are fixed to the back surfaces of the respective vibration plates 16 and 17 so as to straddle the vibration plates, and the transducers 18 and 19 are respectively mounted on the mounting stays 20. ,
Therefore, the rigidity of the mounting portions of the transducers 18 and 19 can be increased, and the vibrations generated by the transducers 18 and 19 can be efficiently transmitted to the diaphragms 16 and 17, so that a realistic sound is emitted. Can sound.
(7) Further, since each of the diaphragms 16 and 17 can emit high-range sounds, a high-frequency range with a realistic spread can be obtained without externally attaching a speaker that emits high-range sounds. Sound can be emitted.
(8) As described above, by implementing the electronic keyboard instrument 1 of the first embodiment, a realistic sound can be emitted without damaging the design of the entire instrument.

<Second embodiment>
Next, a second embodiment of the present invention will be described with reference to FIGS.
The electronic keyboard instrument 1 according to this embodiment has a front surface 8a of an upper front plate 8, which is an exterior surface, of an upper front plate 8, which is an exterior surface, as shown by a broken line in FIG. It is characterized in that a right diaphragm 16a and a left diaphragm 17a are provided as a part. Since the upper front plate 8 has a shorter vertical length than the roof plate 10, each of the diaphragms 16a and 17a is formed in a rectangular shape whose length is shorter than each of the diaphragms 16 and 17 of the first embodiment. I have. The mounting structure of each of the diaphragms 16a and 17a is the same as the mounting structure in the first embodiment. The main electrical configuration is the same as that of the first embodiment.

[Effect of Second Embodiment]
As described above, when the electronic keyboard instrument 1 of the second embodiment is implemented, each vibration provided as a part of the front surface 8a of the upper front plate 8, which is the exterior surface, is arranged to face the player. Since the sound is emitted from the plates 16a and 17a, it is not necessary to emit the sound via the tone escape, so that the sound can be efficiently delivered to the player or the audience.
Moreover, it is not necessary to form a tone escape on the musical instrument housing 2.

<Third embodiment>
Next, a third embodiment of the present invention will be described with reference to FIGS.
FIG. 5 is a front view showing the electronic keyboard instrument 1 according to this embodiment with the keyboard cover 28 opened. FIG. 6A is a right side view of the electronic keyboard instrument 1 shown in FIG. 5, and FIG. 6B is an enlarged view of the keyboard cover 28 shown in FIG.

The electronic keyboard instrument 1 according to this embodiment is characterized in that the diaphragms 16b and 17b are provided on the keyboard cover 28.
As shown in FIG. 5, the musical instrument housing 2 includes a keyboard cover 28 that covers the keyboard 11. The keyboard lid 28 has a structure that opens and closes with the rear end as a rotation axis, and when opened, the back surface 28a is exposed to face the player. A right diaphragm 16b is provided on the right side of the back surface 28a of the keyboard cover 28, which is an exterior surface, and a left diaphragm 17b is provided on the left side as a part of the back surface 28a. As shown in FIG. 6B, a right transducer 18b is mounted on the back surface of the right diaphragm 16b via a mounting stay 20b. A network circuit (not shown) is electrically connected to the right transducer 18b, and the network circuit is electrically connected to the amplifier 26 (FIG. 4) by a connection cable 21b. Although not shown, a left transducer is mounted on the back surface of the left diaphragm 17b via a mounting stay. A network circuit (not shown) is electrically connected to the left transducer, and the network circuit is electrically connected to the amplifier 26 (FIG. 4) by a connection cable. The mounting structure and main electrical configuration of each transducer 18b, 19b are the same as the mounting structure of the first embodiment.

[Effects of Third Embodiment]
As described above, when the electronic keyboard instrument 1 of the third embodiment is implemented, sound is emitted from each of the diaphragms 16b and 17b provided as a part of the back surface 28a facing the player with the keyboard cover 28 opened. Therefore, there is no need to emit a sound via the tone escape, and the sound can be efficiently delivered to a player or an audience.
Moreover, it is not necessary to form a tone escape on the musical instrument housing 2.

<Other embodiments>
(1) In the exposed upper surface 10a of the roof panel 10, regions corresponding to the respective diaphragms 16 and 17 of the first embodiment are formed thin, and the thin regions are used as diaphragms. You can also. Further, of the exposed front surface 8a of the upper front plate 8, regions corresponding to the respective diaphragms 16a and 17a of the second embodiment are formed thin, and the thin regions are used as respective diaphragms. You can also. That is, it is also possible to form a part of the exterior surface of the musical instrument housing 2 to be thin and use that part as a diaphragm.
As described above, if a diaphragm is formed by using a part of the exterior surface of the musical instrument housing 2, the boundary between each diaphragm and the musical instrument housing 2 cannot be seen. There is no damage to the design of the instrument.

(2) In the first embodiment, the upper surface 10a of the roof plate 10 and the upper surfaces of the respective diaphragms 16 and 17 are covered with one film so that the boundaries between the respective diaphragms 16 and 17 and the upper surface 10a do not appear. It can also be configured. In the second embodiment, the front surface 8a of the upper front plate 8 and the front surfaces of the diaphragms 16a, 17a are covered with one film so that the boundary between the diaphragms 16a, 17a and the front surface 8a does not appear. It can also be configured.
As described above, if the diaphragms 16, 17, 16a, 17a and their surroundings are covered with one film, the boundaries between the diaphragms 16, 17, 16a, 17a and the instrument housing 2 are hidden, Since the presence of the diaphragm is not known at all, the design of the instrument is not damaged.

(3) Each diaphragm may be provided integrally on the front surface of the lower front plate 9 (FIG. 1).
Alternatively, the music stand 12 may be formed to be horizontally long, the respective diaphragms may be integrally provided on the front surface of the music stand 12, and the transducers may be provided inside the music stand 12. If this configuration is implemented, sound can be emitted from each of the diaphragms with the music stand raised, so that a realistic sound can be emitted without damaging the design of the entire instrument. It is desirable that the music stand 12 be formed in such a size that the musical score does not obstruct sound emission, and that the respective diaphragms be arranged.

(4) Each diaphragm can be configured to emit sound in the middle and high range. Further, two diaphragms for the high frequency range and two diaphragms for the mid frequency range can be provided. Further, each diaphragm may be formed in a shape such as an ellipse or a circle other than a square. Furthermore, each diaphragm can be formed of resin. Further, in the first and second embodiments, each diaphragm can be attached to the step portion 10c with an adhesive. Further, the diaphragm may be formed to have substantially the same size as the opening 10b without forming the step portion 10c, and the diaphragm may be fitted into the opening 10b. Furthermore, it is also possible to form protrusions at a plurality of locations on the inner wall of the opening 10b, form recesses corresponding to the protrusions on the diaphragm, and fit each recess of the diaphragm into each protrusion of the opening. . Note that a concave portion may be formed in the opening 10b and a convex portion may be formed in the diaphragm.

[Correspondence with Claims]
The sound source data storage unit 24 and the electric signal generation unit 25 correspond to the sound source described in claim 1, and each of the transducers 18, 19, 18b corresponds to a vibration generation unit. The mounting stay corresponds to the mounting member according to the ninth aspect.

DESCRIPTION OF SYMBOLS 1 Electronic keyboard musical instrument 2 Musical instrument housing 8 Upper front plate 8a Front surface 10 Roof plate 10a Upper surface 11 Keyboard 16, 16a, 16b Right diaphragm 17, 17a, 17b Left diaphragm 18, 18b Right transducer 19 Left transducer 20, 20b Mounting stay 24 sound source data storage unit 25 electric signal generation unit

Claims (10)

Instrument housing,
A keyboard arranged at the front of the instrument housing,
A sound source that supplies an electric signal in accordance with operation of the keyboard,
A diaphragm constituting a part of the exterior surface of the musical instrument housing,
A vibration generator that is provided on the back surface of the diaphragm, generates vibration according to the electric signal supplied from the sound source, and transmits the vibration to the diaphragm from the back surface,
The electronic keyboard instrument wherein the diaphragm vibrates due to vibration transmitted from the vibration generating unit and emits a sound corresponding to the electric signal.   The electronic keyboard instrument according to claim 1, wherein the exterior surface is an upper surface of a roof plate of the instrument housing.   The electronic keyboard instrument according to claim 1, wherein the exterior surface is a surface of the instrument housing facing a player. The musical instrument housing includes a keyboard cover that covers the keyboard,
The keyboard lid has a structure that opens and closes with a rear end as a rotation axis,
The electronic keyboard instrument according to claim 1, wherein the exterior surface is a surface facing a player when the keyboard cover is open.   The electronic keyboard instrument according to any one of claims 1 to 4, wherein the diaphragm has a thin outer surface. An opening is formed in the exterior surface,
The electronic keyboard instrument according to any one of claims 1 to 4, wherein the diaphragm is provided so as to cover the opening. The exterior surface is formed of wood,
The electronic keyboard instrument according to claim 6, wherein the diaphragm is formed of a material having higher acoustic impedance than the wood.   8. The electronic keyboard instrument according to claim 6, wherein the surface of the diaphragm is covered with a film having the same design as that of the periphery of the diaphragm. On the back surface of the diaphragm, a mounting member is attached across the diaphragm,
The electronic keyboard musical instrument according to any one of claims 1 to 8, wherein the vibration generator is attached to the attachment member.   The electronic keyboard instrument according to any one of claims 1 to 9, wherein the diaphragm emits a sound in a high frequency range.

Images