JP3462323B2 - Electronic musical instrument keyboard device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a keyboard device for an electronic musical instrument such as an electronic piano, and more particularly to a keyboard device provided with a simulated action device for applying a load simulating an action to the keyboard.

[0002]

2. Description of the Related Art FIG. 8 shows an example of a keyboard device generally used in a conventional electronic piano. This keyboard device 1 includes a plurality of (88 keys) keyboards 2 (one white key 2a and one black key 2b shown in the figure), a simulated action device 3 provided on the rear part of the keyboard 2 (right side in the figure), and The keyboard 2 is provided with a key sensor 4 provided below the keyboard 2, and a control device (not shown) for controlling sound generation according to the detection result of the key sensor 4.

The key sensor 4 is constructed so as to be able to detect the presence or absence of a key press on the keyboard 2 and the key press speed (velocity) by means of a rubber switch or the like.
The pitch is controlled according to the key number of the pressed keyboard 2, and the volume and tone color are controlled according to the detected key pressing speed. By such control, it is possible to obtain a predetermined pitch according to the pressed keyboard 2 and a change in volume and timbre according to the key touch.

On the other hand, the simulated action device 3 is composed of a hammer 5 corresponding to each of the plurality of keyboards 2 and a hammer stopper 6. The hammer 5 has a rear end portion (on the right side in the drawing) rotatably supported by a rotating shaft 7, and
It is in contact with the upper surface of the rear end portion of the keyboard 2 via the contact portion 8. The hammer stopper 6 is made of felt or the like,
It is located above the hammer 5 and attached to the action rib 39. In this case, the configurations such as the size and weight of each hammer 5 and the positional relationship with the hammer stopper 6 are all the same.

With the above structure, the weight of the hammer 5 is always transmitted to the fingertips pressing the keyboard 2 as the touch weight, and the hammer 5 is flipped up by the keyboard 2 as the key is pressed, and the hammer stopper is pushed. At 6 (two-dot chain line in the same figure), the key is then returned to its original position as the key is released.

[0006]

However, in the original acoustic piano, there is a difference in the thickness and length of the strings depending on the range, and in order to make the volume and sound quality obtained from the strings uniform, the range from high to low is high. Hammers with different pod weights are attached, and as a result, the feeling of touch differs depending on the range. On the other hand, in the above-mentioned conventional electronic piano, the hammer 5 having the same size and weight with respect to the entire range is used in order to make the volume when the keys are pressed with the same strength the same over the entire range. However, as a result, unlike the original acoustic piano, there is a drawback that the touch feeling becomes uniform regardless of the range.

The present invention has been made in order to solve such a problem, and keeps the volume of an electronic sound source and the like when a key is pressed with the same strength, and is closer to the original acoustic piano. An object of the present invention is to provide a keyboard device for an electronic musical instrument, which can provide a good touch feeling that varies depending on the musical range.

[0008]

To achieve the above object, a keyboard device for an electronic musical instrument according to claim 1 of the present invention comprises a plurality of keyboards associated with a plurality of different musical ranges and a simulated action device. A keyboard device for an electronic musical instrument, comprising: a key-depression information detection unit that detects key-depression information of the keyboard; and a control unit that outputs a control signal for controlling sound generation according to the key-depression information. The simulated action device is provided corresponding to each of the plurality of keyboards, and each of the plurality of keyboards is rotatably supported by a rotating shaft of the keyboard device main body and applies a load to the keyboard via an abutting portion. Hammer and the key
The hammer is interlocked with the key press on the board through the contact part.
And a jack for rotating , wherein the hammer has a lower surface
And a bat having the abutting portion on the bottom surface of the bat.
And a butt felt attached to the jack,
The contact portion is in contact with the side surface of the butt felt.
Configured to push up the butt felt water
It is characterized in that the thickness in the horizontal direction is different depending on the range.

[0009] According to the keyboard device, the bat Fell
It is possible to make the position of the abutting part of the hammer different depending on the range by varying the horizontal thickness of the grate.
Since different loads obtained by this can be applied to the keyboard via the abutting part, different touch feeling can be obtained depending on the range, and the original good touch feeling of the acoustic piano can be obtained. You can get closer.

Further, in the keyboard device for an electronic musical instrument according to a first aspect of the present invention, it is preferable that the horizontal thickness of the bat felt is large on the high tone side and small on the low tone side.

[0011] According to the keyboard device, the bat Fell
Due to the difference in the horizontal thickness of the keyboard, it is possible to reduce the load applied to the treble side keyboard and increase the bass range load.As a result, the weight of the treble side keyboard is lighter. Since the weight of the keyboard touch on the low frequency range becomes heavier, the touch feeling can be brought closer to the original acoustic piano.

[0012]

[0013]

Further, in the keyboard device for an electronic musical instrument according to claim 1 or 2, the control means is such that the volumes obtained when the keys are pressed with the same strength are equal to each other. Therefore, it is preferable to generate and output the control signal.

In the keyboard device of the electronic musical instrument according to the first or second aspect of the present invention, different loads are applied to the keyboards corresponding to different tone ranges, so that the keys can be obtained with the same strength. The key depression information, for example, the key depression speed of the keyboard has different values. According to this keyboard device, in addition to the above-mentioned effect, each keyboard is generated by generating the control signal so that the volume obtained from the key pressing information of different values when the keys are pressed with the same strength becomes uniform. Since the volume from can be kept uniform, it is possible to obtain a good touch feeling and a uniform volume at the same time, which are close to those of the original acoustic piano and vary depending on the range.

In the keyboard device for an electronic musical instrument according to any one of claims 1 to 3 , it is preferable that the control signal is MIDI data.

According to this keyboard device, the control signal is MID.
Since it is I data, if it has a MIDI data interface, it can be connected to not only electronic sound sources but also mixers, synthesizers, sequencers, etc.
Alternatively, when used in combination with various performance devices such as a MIDI guitar, it can be used for various performances, and versatility as a keyboard device can be expanded. Further, since the control signal is MIDI data, it is possible to prepare a series of searchable data strings using the value derived from the key depression information as a parameter, and use the data string as the output value of the control signal. As a result, not only the output value relating only to the moment of key depression, but also the time interval from key depression to key release, the on / off information of the damper pedal, etc. are linked, and a combination of a series of data arranged in time series is described above. It is also possible to use it as the output value of the control signal, and as a result, various applications such as adding a reverberation effect by storing a representation of the attenuation of the pronunciation vibration with a data string of MIDI data are possible. become.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION A case in which a keyboard device according to an embodiment of the present invention is applied to an electronic piano will be described below with reference to the accompanying drawings. In addition, in the following description, unless otherwise specified, elements or parts given the same reference numerals have the same configurations and functions, and duplicate description will be omitted.

FIG. 1 is a block diagram showing an example of an electronic piano to which the keyboard device of this embodiment is applied. In this case, an electronic piano 100 has a keyboard device 101 as shown in the figure.
And an electronic sound source 80 and a speaker 90, and the keyboard device 101 is a simulated action device 103.
A plurality of keyboards 2 and a key sensor (key pressing information detecting means) 4
And a control device (control means) 20.
As shown in the figure, the control device 20 includes an input / output port 7
1, a well-known CPU 72, a ROM 73, a RAM 74, a backup RAM 75, a clock 76, and the like are configured as a logical operation circuit, which are connected to each other by a bus 77. The key sensor 4 has two contacts or sensors (not shown), and detects key press information such as the presence / absence of key press / release of the keyboard 2 and the key press speed (velocity) from the on / off time difference. The electronic sound source 80 includes a storage unit (not shown) that stores the musical tone data of the piano and a reproduction unit (not shown) that reads the musical tone data from the storage unit, and the electronic sound source 80 is connected to the outside through the speaker 90. Is pronounced in. The controller 20 is connected to the key sensor 4 and the electronic sound source 80 via the input / output port 71, and the CPU 72 is connected via the input / output port 71.
Input the above key depression information from the key sensor 4 and temporarily enter R
Based on the control program stored in the AM 74 and stored in the ROM 73, a control signal for controlling sound generation is generated and output to the electronic sound source 80.

Next, in the keyboard apparatus of the present invention, a common principle used for obtaining different touch feelings depending on the musical range will be described below by using the conventional keyboard apparatus 1 of FIG. In the case of the keyboard device 1 shown in FIG. 8, considering the weight at the beginning of movement when the keyboard 2 is gently pushed down (hereinafter abbreviated as “static load”), in principle, the pivot shaft 7 is used as a fulcrum. The horizontal distance from the fulcrum P1 to the center of gravity Gh of the hammer 5 is Lh, the weight of the hammer 5 is Mh, and the fulcrum P1 is P1.
From the moment balance, Fk = (Mh · Lh) / Lk, where Lk is the horizontal distance from the contact part 8 to Fk and Fk is the supporting force of the keyboard 2 supporting the hammer 5 via the contact part 8. The reaction force of the supporting force Fk, which is formula (1), is the fulcrum P of the balance pin
It is transmitted to the finger as a touch weight of the static load Wk via 2.

Therefore, by changing one or more of the above-mentioned weight Mh, horizontal distance Lh, and horizontal distance Lk of the hammer 5 between different tone ranges, the keyboard corresponding to the different tone ranges can be changed. Touch weights of different loads Wk, that is, different touch feelings can be given. As a result, it becomes possible to bring the touch feeling closer to the good touch feeling of the original acoustic piano, which has different touch feeling depending on the range. Other factors that give a good touch feeling include the moment of inertia during rotation of the hammer 5, the let-off feeling peculiar to an acoustic piano, which will be described later, and the like. Focusing on dynamic load.

Specifically, the weight Mh or the horizontal distance Lh is set to a smaller value, or the horizontal distance Lk is set to the smaller value.
Is set to a larger value to reduce the bearing force Fk, that is, a hammer having a smaller static load Wk, which is the reaction force thereof, on the keyboard of the treble range, and conversely, the weight Mh or the horizontal distance Lh. If a hammer having a large value or a large horizontal force Lk and a large supporting force Fk, that is, a large static load Wk, is provided in the low-pitched side keyboard, the high-pitched side keyboard is provided. Since the weight of the touch on the keyboard is lighter and the touch on the keyboard in the low frequency range is heavier, the touch feeling can be brought closer to the original acoustic piano.

For example, FIG. 9 shows an example in which the present invention is applied to a keyboard device equipped with a simulated action device of the same type as the conventional simulated action device 3 of FIG. 8, and in such a keyboard device 101. The simulated action device 103 of FIG. 9 changes the horizontal distance Lk according to the musical range corresponding to the keyboard 2 to apply different static loads. That is, this keyboard device 101 is
In FIG. 9A, the horizontal distance Lk is the same as that in FIG. 8, whereas in FIG. 9B, the horizontal distance Lk is changed by shifting the contact portion 8 to the front side (left side in the drawing). Larger L
It is set to kh. Other configurations are the same as those of the conventional keyboard device 1 of FIG. Therefore, from the balance of the moments, in the case of FIG. 9 (a), as described above, Fk = (Mh.Lh) / Lk ... Equation (1), and in the case of FIG. 9 (b), Fkh = (Mh · Lh) / Lkh (Formula (2)), and since Lkh> Lk, Fkh <Fk.
In FIG. 9B, when the key is pressed, the touch weight of the static load Wkh, which is lighter than in the case of the static load Wk described above, is transmitted to the finger, and a lighter touch feeling is obtained.

As explained above, in the above example, the above three variables, that is, the weight Mh of the hammer 105,
This is an example in which the horizontal distance Lk is changed among the horizontal distance Lh and the horizontal distance Lk, and the position of the abutting portion 8 of the hammer 105, that is, the position corresponding to the so-called leverage point of the hammer 105 is different depending on the range. By doing so, the different loads obtained thereby are applied to the keyboard 2 via the contact portion 8. Therefore, according to the keyboard device 101, the simulated action device 103 can apply different loads to the keyboard 2 via the abutting portion 8 by the hammer 105, depending on the range. It is possible to obtain an effect, that is, a touch feeling that differs depending on the musical range, and it is possible to bring it closer to the good touch feeling of the original acoustic piano.

Next, an example of sound generation control in the electronic piano 100 to which the keyboard device 101 of this embodiment is applied will be described below. Here, in particular, by applying different loads to the keyboards 2 corresponding to different tone ranges, the key depression information obtained when the keys are depressed with the same strength, for example, the key depression speed of the keyboard, In consideration of the fact that the values are different, the tone generation control is performed so that the sound volume obtained from the key pressing information of different values when the keys are pressed with the same strength becomes uniform.

First, an example of performing sound generation processing using an arithmetic expression based on key depression information from the keyboard 2 will be described with reference to FIG. As shown in the figure, the control device 20 described above starts with the key sensor 4 when the sound generation process is started.
It is discriminated whether or not the key depression is detected, and if the key depression is not detected, this discrimination processing is looped to wait until the key depression is detected (S10). When the key depression is detected, the time difference ΔT is obtained from the difference between the ON times of the two contacts of the key sensor 4 (S12). Next, the key number i of the depressed key 2
According to (i = 1 to 88), the output value CONTi (i = 1 to 88) of the control signal (voltage waveform signal, current waveform signal, etc.) for the electronic sound source 80 is calculated from this time difference ΔT (S14). . The output value CONTi is calculated by the equation (5) through the following equations (3) and (4), for example. V = K / ΔT (K is a constant) Equation (3) P = K ′ · V (K ′ is a constant) Equation (4) CONTi = Si · P (i = 1 to 88) Equation (5) Here, V and P represent the key pressing speed and the key pressing strength, respectively. Further, Si (i = 1 to 88) is a predetermined correction coefficient for correcting the key pressing strength P as different loads are applied to the keyboard 2, and each keyboard 2 has the same strength. It is determined in correspondence with the key number i so that the output values CONTi when the keys are pressed are uniform with each other.

Next, the key number i of the depressed keyboard 2
A predetermined waveform signal is obtained based on the output value CONTi and the output value CONTi, and the electronic sound source 80 is controlled based on the waveform signal to cause the speaker 90 to generate a sound (S16). After that, it is determined whether or not the key sensor 4 detects the key release. If the key release is not detected, this determination process is looped and waits until the key release is detected (S18). When the key release is detected, the electronic sound source 80
After stopping the sound generation from (S20), the process returns to S10 again.

As described above, in this tone generation processing, based on the time difference ΔT (key depression information) of the keyboard 2,
The key pressing strength P is calculated using the equations (3) and (4), and the equation (5) (predetermined correction coefficient Si is used by using the predetermined correction coefficient Si determined corresponding to the key number i as described above. The output value CONTi of the control signal is calculated by correcting the key pressing strength P using the correction calculation formula).

Therefore, according to the keyboard device 101, even when different loads are applied to the keyboards 2 corresponding to different tone ranges, the output values CONTi when the keys of the keyboards 2 are pressed with the same strength. Can be controlled evenly between the keyboards 2, and the volume of the electronic sound source 80 obtained thereby can be kept uniform, so that a good touch feeling that is close to the original acoustic piano and that varies depending on the range is uniform. It is possible to obtain the volume and the like at the same time.

The output value CONTi can be calculated by various methods other than those described above. For example, the reference value Sn of the predetermined correction coefficient Si is defined, and the reference output value CNT corresponding to this is set as CNT = SnK'K / ΔT (6), and Qi = Si / Sn ... The correction coefficient Qi (i = 1 to 88) that is the formula (7) may be set, and the output value CONTi may be obtained for each key number using the following formula (8). CONTi = Qi · CNT Equation (8)

Alternatively, based on the above equations (3) to (5), Ri = SiK'K ... Equation (9), and CONTi = Ri / ΔT Equation (10) It is also possible to predetermine the expression (predetermined arithmetic expression) corresponding to the key number i and obtain the output value CONTi from the time difference ΔT. According to this method, the output value CONTi
Can be calculated directly from the time difference ΔT, and the processing time can be shortened.

By the way, in recent years, in music data communication between electronic musical instruments and the like, the MIDI standard has come to be generally used as a world standard, and the MIDI data interface also serves as the aforementioned electronic sound source 80 and the like. Those that have become common. In this case, in the above control method, the output value CONTi of the control signal is set to the MID.
It is necessary to convert to I data and output. However, rather than repeating calculation / conversion every time a key press or the like is detected, a predetermined conversion table (hereinafter abbreviated as “touch curve data”) is stored and the above-mentioned touch curve data is referred to for the above conversion. It is more efficient to obtain control signals, i.e. MIDI data. Further, it is easier to stably obtain a delicate tone color by first obtaining ideal touch curve data and always using it, rather than finely setting the constant K and the like. Therefore, next, an example of sound generation control of an electronic piano or the like when MIDI data is used as an interface with the electronic sound source 80 will be described below with reference to FIGS.

As shown in FIG. 3, when the tone generation processing is started, the control device 20 first determines whether or not the key sensor 4 detects a key depression, and if the key depression is not detected, this determination processing is performed. Loop and wait until key depression is detected (S1
0). When a key press is detected, the flow advances to the flow of FIG. 4 through A, a time difference ΔT is obtained, and from this key press time difference ΔT, a general-purpose touch curve (GLOBAL_TC in the figure) GTC is referred to, and data conversion described later is performed. After obtaining the data (hereinafter, abbreviated as “touch data”) TD1 as a parameter in step S1, the data is handed over to the next process together with the key number i (S1).
1). Next, the flow proceeds to the flow of FIG. 5 through C, and it is determined whether the keyboard 2 pressed by the key number i is a white key or a black key (S131). When the determination result is the white key, the correction coefficient value Depth is referred to by referring to the white key depth correction value table (hereinafter, abbreviated as “white key depth KS curve”) WDKSC.
While obtaining the bias correction value Bias by referring to the white key bias correction value table (hereinafter, referred to as “white key bias KS curve”) WBKSC, the correction touch data TD2 is calculated by, for example, the following formula. Ask (S133). TD2 = Depth × TD1 / α + Bias (α is a constant) Equation (11)

Here, the correction touch data TD2 is used to obtain an output value of MIDI data which is a control signal of the electronic sound source 80, and the correction coefficient value Depth and the bias correction value Bias are used as will be described later. , So that the output values of the MIDI data when the keys of the respective keyboards 2 are pressed with the same strength are made uniform with respect to each other. As a result, the white key depth KS curve WDKSC and the white key bias KS curve W described above are obtained.
BKSC decreases to the right, that is, the correction coefficient value Depth and the bias correction value Bias corresponding to a larger key number i become smaller. It should be noted that these details are set optimally by taking into consideration the load actually applied to each keyboard 2 or by taking actual data.

On the other hand, it is determined whether the key is the white key or the black key (S13).
Even when the determination result of 1) is a black key, as in the case of the white key described above, the depth correction value table of the black key (hereinafter, “black key depth K
S curve) A correction coefficient value Depth is obtained by referring to BDKSC, and a black key bias correction value table (hereinafter abbreviated as “black key bias KS curve”) BB
After obtaining the bias correction value Bias by referring to KSC, the corrected touch data TD2 is obtained by the above equation (11) (S133), and is passed to the next process together with the key number i as a parameter (end of S13). Next, the flow proceeds to the flow of FIG. 6 through D, and it is determined whether the pressed keyboard 2 is the white key or the black key from the key number i (S151), and the touch in the case of the white key is performed according to the determination result. Corrected touch data TD2 with reference to either curve data (hereinafter abbreviated as “white key curve”) WKC or touch curve data BKC for black key (hereinafter abbreviated as “black key curve”) From the control signal to the electronic sound source 80 described above.
After obtaining the IDI data (end of S15), go through B and then to FIG.
Return to the flow of. Next, by controlling the electronic sound source 80 by outputting the MIDI data to the electronic sound source 80,
A sound is emitted from the speaker 90 (S16), and then it is determined whether or not the key sensor 4 detects the key release. If the key release is not detected, this determination processing is looped and waits until the key release is detected (S18). . When the key release is detected, the sound generation from the electronic sound source 80 is stopped (S20), and then the process returns to S10.

As described above, in this tone generation processing, based on the time difference ΔT (key depression information) of the keyboard 2,
The touch data TD1 is obtained using the general-purpose touch curve GTC (predetermined conversion table), the touch data TD1 is corrected by the equation (11) (predetermined correction calculation equation) to obtain the corrected touch data TD2, and then the correction is performed. Touch data T
White key curve WKC and black key curve BK based on D2
The output value of MIDI data (control signal) is derived using C (predetermined conversion table). As described above, the correction coefficient value Depth and the bias correction value Bias (correction coefficient) in the equation (11) are such that the MIDI data output values when the keys of the respective keyboards 2 are pressed with the same strength are equal to each other. The key number i is defined as follows.

Therefore, according to the keyboard device 101, even when different loads are applied to the keyboards 2 corresponding to different tone ranges, MIDI data of each key of the keyboards 2 is pressed with the same strength. Since the output values can be uniformly controlled between the keyboards 2 and the volume of the electronic sound source 80 obtained thereby can be kept uniform, a good touch feeling close to the original acoustic piano and different depending on the range. It is possible to obtain a uniform volume and the like at the same time.

In the above example, the correction coefficient value Dept
Since a table (predetermined correction coefficient table) such as the white key depth KS curve WDKSC is used to derive h and the bias correction value Bias (correction coefficient), for example, pressing the corresponding keyboard of the original acoustic piano. A series of time-series correction coefficient data is prepared as the above-mentioned correction coefficient value Depth and bias correction value Bias (correction coefficient) in accordance with the tone color and the vibration damping characteristic of the string when the key is locked, and the output value of the control signal Applications such as changing the time series are also possible.

Since the control signal is MIDI data, if it has a MIDI data interface, it can be connected not only to an electronic sound source, but also to a mixer, a synthesizer, a sequencer, or the like.
When used in combination with various performance devices such as a guitar, it can be used for various performances and the versatility as a keyboard device can be expanded. further,
When the control signal is MIDI data, a series of searchable data strings can be prepared by using the value derived from the arithmetic expression or the conversion table as a parameter, and the data string can be used as the output value of the control signal. it can. As a result, not only the output value relating only to the moment of key depression, but also the time interval from key depression to key release, the on / off information of the damper pedal, etc. are linked, and a combination of a series of data arranged in time series is described above. It is also possible to use it as the output value of the control signal, and as a result, various applications such as adding a reverberation effect by storing a representation of the attenuation of the pronunciation vibration with a data string of MIDI data are possible. become.

Next, an example of directly obtaining MIDI data from the key depression information will be described with reference to FIGS. 3 and 7. In this tone generation process, as in the case described above, S in FIG.
10 and S11 of FIG. 7 are executed to obtain the touch data TD1 from the detection result of the key sensor 4, and then the touch curve data di (1 ≦ i ≦ is obtained from the index table (hereinafter abbreviated as “touch curve table”) TCT. 88) and select the touch data TD using this touch curve data di.
MIDI data is obtained from 1 (end of S14). Then B
3 to return to the flow of FIG. 3 and output the MIDI data to the electronic sound source 80 to control the electronic sound source 80 so that the speaker 90 produces a sound (S16). After that, as in the case described above, the processing from S18 onward is performed.

In this case, the touch curve data d1 to d88 corresponding to the above key number i (predetermined conversion table)
Means that the MIDI data obtained by these are the same as the MIDI data shown in FIG. 6, that is, the MID when the keyboard 2 is pressed with the same strength.
It is set so that the output value of I data (control signal) becomes uniform. As a result, it is possible to obtain the above-described effect, that is, a good touch feeling and a uniform sound volume, which are close to those of the original acoustic piano and differ depending on the range.

The respective touch data di in this case are the above-mentioned white key curve WKC, black key curve BKC, and white key depth KS.
Curve WDKSC, white key bias KS Curve WBKS
C, black key depth KS curve BDKSC, black key bias KS curve BBKSC, and corrected touch data TD2
It may be obtained in advance from the above-mentioned formula (11) or the like for obtaining, or may be determined based on actual data.
In any case, you should set it so that it is close to the volume of the original acoustic piano. Further, in the above-described example of FIG. 7, the touch curve data d1 to d88 is a conversion table for obtaining MIDI data from the above-described key depression time difference ΔT via the general-purpose touch curve GTC.
A conversion table that can be obtained directly from T can also be used.

As described above, according to the keyboard device 101 of the present embodiment, even if different loads are applied to the keyboard 2 corresponding to different tone ranges by the various sound control of the control device 20, the volume of the electronic sound source is increased. Since it has been described that the keys etc. can be kept uniform, next, referring to FIGS. 10 to 11, a simulated action device 103 other than FIG. 9 for applying different loads to a keyboard corresponding to different musical ranges. A specific example of will be described.

Simulated action device 103 shown in FIG.
9 is a diagram in which the weight Mh of the hammer 105 is increased among the three variables of the above formula (1) by adding the mass body 9 of lead or the like to the hammer 105 as compared with the case of FIG. 9A. is there. The mass body 9 is formed in a plate shape in FIG. 10A and in a column shape in FIG. 10B. As shown in the figure, if the weight Mh becomes Mhl by adding the mass body 9, from the balance of moments, the supporting force Fkl at this time is Fkl = (Mhl.Lh) / Lk. Equation (12) is obtained, and since Mhl> Mh, Fkl> Fk,
The static load Wkl at this time is larger than the static load Wk in the case of FIG. 9A, and a heavier touch feeling can be obtained. In this way, even with this simulated action device 103,
Different loads can be applied to the keyboard 2. In addition,
In addition, as a method of changing the weight Mh of the hammer 105, for example, a method of changing the material of the hammer 105 to a light material or a heavy material can be considered.

Next, an example in which the horizontal distance Lh is changed among the three variables of the equation (1) will be described with reference to FIG. FIG. 11B shows an example in which the mass body 9 is added to the front side of the original center of gravity Gh as compared with the simulated action device 103 of FIG. 10B. In this case, as shown in the figure, the horizontal distance Lh becomes larger Lhl, and from the above formula (12), the supporting force Fkl2 at this time is Fkl2 = (Mhl.Lhl) / Lk. ). As is clear from the comparison with Equation (12), Fk
Since l2> Fkl, the static load Wkl2 is as shown in FIG.
It becomes larger than the static load Wkl of (b), and a heavier touch weight is transmitted to the finger. In addition, hammer 10
As a method of changing the above-mentioned horizontal distance Lh of No. 5, for example, the length of the hammer 105 may be changed as shown in FIG. As shown in FIG.
In any of the cases of (b), since the position of the center of gravity changes and the weight increases as compared with the case of FIG. 9 (a), the load applied to the keyboard 2 can be changed more effectively.

Next, an example in which the present invention is applied to a keyboard device equipped with a simulated action device of a type different from the simulated action device 103 described above will be described below. FIG. 12 shows such a keyboard device 201,
The keyboard device 201 includes a simulated action device 203 imitating an action device of an upright piano in order to obtain a touch feeling closer to that of an acoustic piano. In this simulated action device 203, a rear end (left side in the figure) is rotatably supported by a center rail 36, and a wippen 33 placed on the capstan screw 32 of the keyboard 2 and a lower end of the wippen 33. The rotatably supported jack 34 having an L-shaped cross section and the center rail 3
6, a hammer 205 rotatably supported on the rotating shaft 7 of the bat flange 35, and a regulating button 37.
, A hammer rail 38, and a hammer stopper 6 arranged so as to face the hammer 205.

As shown in FIG. 13, the basic structure of the hammer 205 is a bat 53 with which the upper end of the jack 34 abuts via the abutting portion 8, and a bat felt 54 provided at the lower end of the bat 53. A hammer shank 52 having a lower end fixed to a bat 53, and a hammer head 51 attached to an upper end of the hammer shank 52,
In the key-released state, the hammer shank 52 obliquely contacts the hammer rail 38 arranged on the front side.

As shown in FIG. 12, when the keyboard 2 is depressed, the jack 34 rises and the jack 34 moves the bat 53.
By pushing up through the contact portion 8, the hammer 2
05 rotates about the rotation shaft 7. This hammer 205
The jack 34 engages with the regulating button 37 and pivots during the pivoting of, and is disengaged from the bat 53. By this detachment, a so-called let-off feeling peculiar to the acoustic piano is obtained. The hammer 205 returns and rotates in the opposite direction after the hammer head 51 hits the hammer stopper 6 (see the chain double-dashed line in FIG. 14 and FIG. 14) in the inertial rotation state away from the jack 34.

As shown in FIGS. 12 and 13, also in the simulated action device 203 of the keyboard device 201, in principle, the pivot shaft 7 is used as the fulcrum P1, and the fulcrum from this fulcrum P1 to the center of gravity Gh of the hammer 205 is horizontal. When the distance is Lh, the weight of the hammer 205 is Mh, the horizontal distance from the fulcrum P1 to the contact portion 8 is Lk, and the supporting force of the keyboard 2 for supporting the hammer 205 via the contact portion 8 is Fk, the moment From the balance, the reaction force of the supporting force Fk, which is Fk = (Mh · Lh) / Lk (Equation 1), is passed through the jack 34, the wippen 33, and the capstan screw 32 (see FIG. 12). Similar to the above-described simulated action device 103, the static load Wk is transmitted to the finger as a touch weight via the fulcrum P2 of the balance pin 22 of the keyboard 2.

Therefore, also in the simulated action device 203 of this embodiment, any one of the above-described weight Mh, horizontal distance Lh, and horizontal distance Lk of the hammer 205 (of each action lined up in the depth direction of FIG. 12) is selected depending on the range. Alternatively, by changing two or more, different touch weights can be given depending on the range. In addition to this effect, the simulated action device 203 can obtain the above-described let-off feeling peculiar to the acoustic piano, and thus can be brought closer to the good touch feeling of the original acoustic piano.

15 to 21 show the simulated action device 2
In No. 03, there are various specific examples for applying different loads to the keyboard corresponding to different tone ranges.

FIG. 15 shows an example in which the shape of the hammer head is different in the simulated action device 203 according to the sound range. FIG. 15 (a) shows the hammer 205L on the low sound side, FIG. b) shows the hammer 205H on the high frequency side. As shown in the figure, the hammer 205L on the low frequency side has a hammer head 2051L which is smaller than the hammer 205H on the high frequency side.
The only difference is that it is thicker than 1H, that is, heavier, and the other configurations are the same. Therefore, the hammer 205L on the low frequency side is the hammer 205L on the high frequency side.
Compared with H, the weight is Mhl> Mhh, and the center of gravity is located on the front side (on the right side in the drawing). Therefore, the horizontal distance is Lhl> Lhh, and thus the supporting force is Fkl> Fkh. As a result, the corresponding static load Wkl> Wkh is established, and the touch weight can be made heavier on the bass range and lighter on the treble range.

FIG. 16 shows an example in which, in the simulated action device 203, the weight of the mass body added to the hammer head is made different according to the range of sound.
Similarly to FIG. 16A, the hammer 205 on the bass range is shown in FIG.
L, FIG. 16B shows the hammer 205 on the high frequency side.
As shown in the figure, the hammer 205L on the bass range has a hammer head 51L
The mass body 209L added to the
The only difference is that it is heavier than 9H. Therefore, since the relationship between the weight and the center of gravity is the same as that in FIG. 15, the static load W
kl> Wkh, and the touch weight is heavy on the low frequency side,
It can be lightened on the high register side.

FIG. 17 shows an example in which the position of the center of gravity of the mass body added to the hammerhead is made different in the simulated action device 203 according to the range.
In the case of the hammer 205L on the low range side, the mass body 9 is attached so that the position of the center of gravity of the mass body 9 is at the position GA far from the rotating shaft 7, and in the case of the hammer 205H on the high range side, It is designed to be attached at a close position GB. Therefore, the horizontal distance Lhl from the fulcrum P1 of the hammer 205L to the center of gravity Ghl is
Is larger than the horizontal distance Lhh to the center of gravity Ghh of
> Lhh, so static load Wkl> Wkh,
The touch weight can be heavy on the low frequency side and light on the high frequency side.

FIG. 18 shows an example different from that of FIG. 17 in which the position of the center of gravity of the mass body added to the hammerhead is made different according to the musical range. Instead, a mass body having a screw mechanism, for example, a male screw member 9a such as a bolt (hereinafter abbreviated as "bolt") and a female screw member 9b such as a nut (hereinafter "nut").
In the above description, an abbreviation is used as a representative. In the low-pitched hammer 205L, the nut 9b is A in the figure.
The hammer 205H on the treble side is located closer to the hammer head 51 and is located at position B in the figure. Therefore, the relationship of the center of gravity becomes the same as in FIG. 17, so that the static load Wkl> Wkh, and the touch weight can be made heavier on the bass range and lighter on the treble range.

FIG. 19 shows an example in which the length of the hammer shank in the simulated action device 203 is made different depending on the range, and like FIG. 15 and FIG. 16, FIG. Shows a hammer 205L on the low sound side, and FIG. 19B shows a hammer 205H on the high sound side. As shown in the figure, the hammer shank 20 on the bass side
52L is longer than the hammer shank 2052H on the high frequency side, and is different only in that the weight is heavier. Therefore, since the relationship between the weight and the center of gravity is the same as in FIGS. 15 and 16, the static load Wkl> Wkh, and the touch weight can be heavy on the low-pitched sound side and light on the high-pitched sound side. Note that the hammer stopper 6 with which the hammer head 51 hits is obliquely arranged as shown in FIG. 20 due to the change in the length of the hammer shank (see also FIG. 14). Alternatively, similarly to the simulated action device 303 described later, if the hammer shank hits the hammer stopper 6, its position is aligned with the shortest hammer shank (see the two-dot chain line portion 6s in FIG. 20) and then horizontally. It can also be arranged.

FIG. 21 shows an example in which in the simulated action device 203, the position of the abutting portion 8 is made different depending on the musical range by changing the thickness of the bat felt attached to the lower surface of the bat. As in FIG. 19 and the like, FIG.
FIG. 21B shows the hammer 205H on the high frequency side. The bat felt is a cushioning member for preventing noise when the jack returns, and usually has a constant thickness. However, in this example, as shown in the figure, the bat 5 on the high frequency side is
Bat felt 2054B attached to No. 3 has a thickness larger than that of bat felt 2054A on the bass range, whereby the contact portion 8 on the treble range is located in front of the contact portion 8 on the bass range ( It is located on the right side of the figure). The other configurations are the same in both cases. Therefore, since the horizontal distance Lkl from the fulcrum P1 of the hammer 205L on the low tone side to the contact portion 8 is smaller than the horizontal distance Lhh of the hammer 205H and Lkl <Lhh, the supporting force Fkl> F
It will be kh. As a result, the corresponding static load Wkl> W
It becomes kh, and the touch weight can be made heavier on the low frequency side and lighter on the high frequency side.

Next, a keyboard device 30 equipped with a simulated action device 303 imitating an action device of a grand piano.
An example in which the present invention is applied to No. 1 will be described with reference to FIG. As shown in FIG. 22, in this simulated action device 303, the rear end portion (right side in the drawing) is rotatably supported by the wippen rail 46 via the wippen flange 33b, and on the capstan screw 32 of the keyboard 2. Wippen 3 placed on the Whippen heel 33a
3, a repetition lever 45, a jack 34 having an L-shaped cross section, a hammer 305 rotatably supported by a rotating shaft 7 of a shank rail 47, a regulating button 37, and a hammer 305 arranged so as to face the hammer 305. And a hammer stopper 6 that has been set.

The repetition lever 45 is provided on the upper surface of the intermediate portion of the wippen 33.
It is oscillatably supported via a, and the spring 45b constantly imparts a turning habit in the clockwise direction in the figure, and the rotation is restricted by the repetition button 45c. The lower end of the jack 34 is rotatably supported by the wippen 33, and the upper end of the jack 34 is always engaged with the long hole 45d of the repetition lever 45 while allowing a small angle of rotation. It is in contact with the contact portion 8 on the lower surface of the roller 55.

As shown in FIG. 23, the hammer 305 includes a hammer shank 52 rotatably supported on the rotary shaft 7 of the shank flange 47a of the shank rail 47.
Of the hammer shank 52, which is attached to the lower surface of the front end portion (left side in the figure) of the hammer shank 52 as a cushioning member, and the upper end of the jack 34 abuts via the abutment portion 8. The hammer head 51 is attached to the rear end (right side in the figure).

As shown in FIG. 22, when the keyboard 2 is depressed, the capstan screw 32 and the wippen heel 3 are pressed.
3 a and the wippen 33, the jack 34 rises, and the jack 34 pushes up the hammer roller 55 via the abutting portion 8 so that the hammer 305 moves.
Rotate around. During the rotation of the hammer 305, the jack 34 engages with the regulating button 37 to rotate and temporarily disengages from the hammer roller 55. By this detachment, the let-off feeling peculiar to the acoustic piano is obtained. Hammer 305 is Jack 3
Even after being separated from 4, the hammer shank 52 hits and hits the hammer stopper 6 due to inertia (2 in the same figure).
After that (dashed-dotted line), it is rotated and lowered by its own weight and repulsive force, and is received by the back check 48 and held at the initial position.

As shown in FIGS. 22 and 23, also in the simulated action device 303 of the keyboard device 301, in principle, the rotating shaft 7 is used as the fulcrum P1 and the horizontal from the fulcrum P1 to the center of gravity Gh of the hammer 305. When the distance is Lh, the weight of the hammer 305 is Mh, the horizontal distance from the fulcrum P1 to the contact portion 8 is Lk, and the supporting force for the keyboard 2 to support the hammer 305 through the contact portion 8 is Fk, then Fk = (Mh.Lh) / Lk .. The reaction force of the supporting force Fk, which is the formula (1), passes through the jack 34, the wippen 33, and the capstan screw 32 (see FIG. 22), and the above-mentioned simulated action device is obtained. 103 and 2
Similarly to 03, the static load Wk is transmitted to the finger as a touch weight via the fulcrum P2 of the balance pin 22 of the keyboard 2.

Therefore, also in the simulated action device 303 of this embodiment, any one of the above-mentioned weight Mh, horizontal distance Lh, and horizontal distance Lk of the hammer 305 (of each action lined up in the depth direction of FIG. 22) is selected depending on the sound range. Alternatively, by changing two or more, different touch feelings can be given depending on the range. Further, since it is possible to obtain a let-off feeling peculiar to an acoustic piano, it is possible to bring it closer to the good touch feeling of the original acoustic piano.

24 to 28 show the simulated action device 3
In No. 03, there are various specific examples for applying different loads to the keyboard corresponding to different tone ranges.

FIG. 24 shows an example in which the shape of the hammer head is made different in the simulated action device 303 according to the sound range. FIG. 24 (a) shows the hammer 305L on the low sound range side, and FIG. b) shows the hammer 305H on the high frequency side. As shown in the figure, the hammer head 3051L on the low frequency side is formed thicker, that is, heavier than the hammer head 3051H on the high frequency side. Therefore, similarly to the case of the simulated action device 203 in FIG. 15, the hammer 305L on the low frequency side has a larger weight as a whole than the hammer 305H on the high frequency side, and Mhl> Mhh. It is located on the rear side (right side in the figure), the horizontal distance from the fulcrum P1 to the center of gravity is large, and Lhl> Lhh, so that the supporting force Fkl> F
It will be kh. As a result, the corresponding static load Wkl> W
It becomes kh, and a touch weight that is heavy on the low frequency side and light on the high frequency side is obtained.

FIG. 25 shows an example in which, in the simulated action device 303, the weight of the mass body added to the hammer head is made different according to the range of sound.
2 similar to the example in the simulated action device 203 of FIG.
Since the mass body 309L added to the hammer head 51 of the hammer 305L on the bass range in FIG. 5 (a) is heavier than the mass body 309H on the treble range in FIG. 25 (b), the corresponding static load Wkl > Wkh, and the touch weight is heavy on the low frequency side and light on the high frequency side.

FIG. 26 shows an example in which the position of the center of gravity of the mass body added to the hammer head is different in the simulated action device 303 according to the range.
Similar to the example in the simulated action device 203 of FIG. 17, the center of gravity position GA of the mass body 9 added to the hammer 305L on the low tone range side of FIG. 26A is the center of gravity position on the high tone range side of FIG. 26B. Since it is located farther from the rotating shaft 7 than GB, a static load Wkl> Wkh is established, and a touch weight that is heavy on the low sound side and light on the high sound side is obtained. In this case,
Similar to the simulated action device 203 of FIG. 18, the same effect can be obtained by using a mass body having the above-mentioned screw mechanism, for example, a bolt 9a and a nut 9b, instead of the mass body 9 of lead or the like. You can

FIG. 27 shows an example in which the length of the hammer shank is made different in the simulated action device 303 depending on the musical range. Similar to the example in the simulated action device 203 of FIG. 19, FIG. Hammer shank 3052L of hammer 305L on the bass side of (a)
Is longer than the hammer shank 3052H of the hammer 305H on the treble side in FIG. 27 (b), and the weight is heavier by that amount, so that the static load Wkl> Wkh, and the touch weight is heavy on the bass side and light on the treble side. Is obtained. In this case, the hammer stopper 6 that blocks the rotation of the hammer 305 may be arranged according to the shortest hammer shank.

FIG. 28 shows an example in which, in the simulated action device 303, the mounting position of the hammer roller (cushioning member) to the hammer shank 52 is changed so that the position of the abutting portion 8 differs depending on the musical range. 28, similar to the example in the simulated action device 203 of FIG.
The hammer roller 3055B of the hammer 305L on the high-pitched sound side in (a) corresponds to the hammer 30 on the low-pitched sound side in FIG. 28 (b).
Rear side of 5H hammer roller 3055A (right side in the figure)
Is attached to the contact part 8 on the treble range.
Is located rearward of the abutting portion 8 on the bass range side. Therefore, since the horizontal distance Lkl from the fulcrum P1 on the low-pitched sound side to the contact portion 8 is smaller than the horizontal distance Lhh on the high-pitched sound side, static load Wkl> Wkh, and the touch weight is heavy on the low-pitched sound side and light on the high-pitched sound side. Is obtained.

In the simulated action device 303, the wippen 33 on the wippen flange 33b is used.
Of the capstan screw 3 as a fulcrum
When a lever having the position 2 as the force point is considered (see FIG. 22), the pivot shaft 33d that is the attachment position of the jack 34 to the wippen 33 is considered to be one of the action points. In this case, the fulcrum, that is, the shorter the horizontal distance from the rotation shaft 33c, is the power point, that is, the capstan screw 3
Since the force required for 2 may be small, when the position of the abutting portion 8 is shifted, for example, a hammer roller is attached to the rear side, and in accordance with this, the wippen 33 is shortened or the attachment is performed. Only the position may be shifted to the rear part so that the rotating shaft 33d is brought closer to the rotating shaft 33c.

The present invention is not limited to the embodiment described above, but can be implemented in various modes.

For example, the present invention can be applied to simulated action devices other than the simulated action devices 103, 203 and 303 described above, and an example thereof is a simulated action device 403 shown in FIG. In this case, unlike the case of the above-mentioned three simulated action devices, the contact portion 8 and the center of gravity Gh are located on the opposite side when viewed from the rotating shaft 7 serving as the fulcrum P1, but as is clear from the figure, The relationship between the three variables of the equation (1), that is, the weight Mh, the horizontal distance Lh, and the horizontal distance Lk, and the supporting force Fk is the same. Therefore, even in this simulated action device 403, the above 3
By changing any one or two or more of the two variables, it is possible to give different touch feelings depending on the range.

In addition, the detailed configuration and the like can be changed as appropriate without departing from the spirit of the present invention.

[0074]

As described in detail above, according to the keyboard device for an electronic musical instrument of the present invention, the volume of the electronic sound source when the keys are pressed with the same strength is kept uniform, and a more original acoustic piano is realized. There is an effect such that a good touch feeling can be obtained which is close to each other and different depending on the range.

[Brief description of drawings]

FIG. 1 is a block diagram of an electronic piano to which a keyboard device according to an embodiment of the present invention is applied.

FIG. 2 is a flowchart of a sound generation process based on key depression information from a keyboard to which a reference load is applied.

FIG. 3 is a flowchart showing a common part of sound generation processing in FIGS. 4 to 7 when a MIDI data interface is used.

FIG. 4 is a flowchart showing a part of a sounding process similar to that of FIG. 2 when a MIDI data interface is used.

FIG. 5 is a flowchart showing a part of a main part of sound generation processing when a MIDI data interface is used.

FIG. 6 is a flowchart showing a part of a main part of sound generation processing when a MIDI data interface is used.

FIG. 7 is a flowchart showing the main part of another example of sound generation processing when a MIDI data interface is used.

FIG. 8 is a partial side view showing a keyboard device provided with a conventional simulated action device and also showing a keyboard device to which the present invention is applied.

9 shows an example in which the present invention is applied to a keyboard device equipped with a simulated action device of the type shown in FIG. 8, and shows an example of a hammer that applies different loads to the keyboard in the simulated action device shown in FIG. It is a side view.

10 is a view similar to FIG. 9, showing another example of the simulated action device of the type shown in FIG.

FIG. 11 is a view similar to FIG. 9 showing another example.

FIG. 12 is a partial side view showing a keyboard device of the present invention equipped with a simulated action device of a type imitating an action device of an upright piano.

13 is a side view showing the basic structure of a hammer in the simulated action device of the type shown in FIG.

FIG. 14 is a front view showing a hammer in the simulated action device of the type shown in FIG.

FIG. 15 is a side view showing an example of a hammer that applies different loads to a keyboard in the simulated action device of the type shown in FIG.

16 is a view similar to FIG. 15, showing another example of the simulated action device of the type shown in FIG.

FIG. 17 is a view similar to FIG. 15 showing another example.

FIG. 18 is a view similar to FIG. 15 showing another example.

FIG. 19 is a view similar to FIG. 15 showing another example.

20 is a front view showing the hammer shown in FIG. 19 in the simulated action device of the type shown in FIG. 12;

FIG. 21 is a view similar to FIG. 15, showing another example.

FIG. 22 is a partial side view showing a keyboard device of the present invention equipped with a simulated action device of a type imitating an action device of a grand piano.

23 is a side view showing the basic structure of a hammer in the simulated action device of the type shown in FIG. 22. FIG.

FIG. 24 is a side view showing an example of a hammer that applies different loads to a keyboard in the simulated action device of the type shown in FIG. 22.

FIG. 25 is a view similar to FIG. 24, showing another example of the simulated action device of the type shown in FIG. 22;

FIG. 26 is a view similar to FIG. 24, showing another example.

FIG. 27 is a view similar to FIG. 24, showing another example.

FIG. 28 is a view similar to FIG. 24, showing another example.

FIG. 29 is a partial side view showing another keyboard device of the present invention including another simulated action device.

[Explanation of symbols]

101, 201, 301, 401 ... keyboard device 103, 203, 303, 403 ... simulated action device 105, 205, 305, 405 ... hammer 2 keyboard 4 key sensor (key press information detecting means) 6 hammer stopper 7 Rotating Shaft 8 Abutment 9 Mass Device 20 Control Device (Control Means) 33 Wippen 34 Jack 51 Hammer Head 52 Hammer Shank 53 Bat 54 Butt Felt 55 Hammer Roller (Cushioning Member) GTC General-purpose Touch Curve (Predetermined Conversion Table) WKC white key curve (predetermined conversion table) BKC black key curve (predetermined conversion table) WDKSC white key depth KS curve (predetermined correction coefficient table) WBKSC white key bias KS curve (predetermined correction coefficient table) BDKSC black key depth KS curve (predetermined correction coefficient table) BBKSC Black key key Scan KS curve (predetermined correction coefficient table) TCT touch curve table (predetermined conversion table) D1～d88 touch curve data (a predetermined conversion table)

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takahiro Nakamura 200 Terashima-cho, Hamamatsu City, Shizuoka Prefecture Kawai Musical Instrument Mfg. Co., Ltd. (56) Reference JP-A-4-172398 (JP, A) JP-A-5-73038 (JP, A) JP 4-347895 (JP, A) JP 4-248594 (JP, A) JP 5-295568 (JP, A) JP 6-289867 (JP, A) Kaihei 8-76756 (JP, A) JP-A-55-21014 (JP, A) Actual Kaihei 5-90586 (JP, U) Actual Kaihei 6-25895 (JP, U) Actual Kaihei 1-103885 ( JP, U) Jikkou 2-45911 (JP, Y2) Jikho 1-19187 (JP, Y2) Patent 2917863 (JP, B2) (58) Fields investigated (Int.Cl. ⁷ , DB name) G10B 3/12 G10C 3/16 G10H 1/34

Claims (4)

(57) [Claims] 1. A plurality of keyboards associated with a plurality of different musical ranges, a simulated action device, key-depression information detection means for detecting key-depression information of the keyboard, and sounding according to the key-depression information. A keyboard device of an electronic musical instrument comprising: a control unit that outputs a control signal for controlling, wherein the simulated action device is provided corresponding to each of the plurality of keyboards.
A plurality of hammers that are rotatably supported by a rotation shaft of the keyboard device body and apply a load to the keyboard through a contact portion; and a plurality of hammers that interlock with key pressing of the keyboard through the contact portion. Han
A jack for rotating the mar, the hammer includes a bat having the contact portion on a lower surface,
With a bat felt attached to the bottom surface of the bat
Equipped with the jack in contact with the side surface of the butt felt
The keyboard device for an electronic musical instrument , wherein the abutting portion is configured to be pushed up, and the thickness of the bat felt in the horizontal direction is different depending on the range. 2. The horizontal thickness of the butt felt
Only the treble side is large, and wherein the low range side is small, the electronic musical instrument keyboard apparatus according to claim 1. 3. The control means is obtained when the keys are pressed with the same strength.
Make sure that the volume is evenly distributed between the keyboards.
A keyboard device for an electronic musical instrument according to claim 1 or 2, wherein the keyboard device generates and outputs a control signal . 4. The keyboard device for an electronic musical instrument according to any one of claims 1 to 3, wherein the control signal is MIDI data .