JP2007256869A - Key driving device and keyboard musical instrument - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a key driving device, driving a key of a keyboard musical instrument which can be made compact and lightweight, and can drive the key with less electric power. <P>SOLUTION: The key driving device 1, which drives the key 7 supported in a swingable state on a frame, includes an energizing means 21 of energizing the key 7 toward the frame in one swinging direction, a first magnet 15 which moves associatively with the swing of the key 7, and a second magnet 19 which is fixed to the frame and comes into contact with the first magnet 15 to restrict the swing of the key 7 in the one swinging direction. One of the two magnets 15 and 19 is made of an electromagnet; and when currents are made flow to coils 15b and 19b of the electromagnet, magnetic poles of the two magnets 15 and 19, which come into contact with each other, to match. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a key drive device and a keyboard instrument.

Some keyboard instruments such as conventional electronic keyboards and acoustic pianos are provided with a key driving device that individually drives each key (see, for example, Patent Documents 1 and 2). In this kind of keyboard instrument, each key can be driven by a key driving device in accordance with performance information corresponding to a series of musical sounds constituting a musical composition.
In a conventional key drive device, a solenoid using a solenoid as in Patent Document 1 or a combination of a stepping motor and a gear mechanism as in Patent Document 2 is used as an actuator. Accordingly, each key is driven by supplying a drive voltage or a drive signal to a solenoid, a stepping motor or the like according to the performance information.
JP 59-37594 A JP 2004-294769 A

However, since the above-described conventional key driving device uses a combination of a solenoid, a stepping motor, and a gear mechanism as an actuator, there arises a problem that the key driving device itself is increased in size and weight. This defect has a problem that it cannot be applied to an electronic keyboard in which portability is particularly important.
In addition, since the above-described actuator is used in the conventional key driving device, there is a problem that a large amount of power is required to obtain a sufficient driving force at the initial stage of key driving when the key starts to be driven. This problem has a problem that it becomes difficult to apply to a battery-specific electronic keyboard.

  In view of the circumstances described above, an object of the present invention is to provide a key driving device that can be reduced in size and weight and can drive a key with power saving, and a keyboard instrument including the key driving device.

In order to solve the above problems, the present invention proposes the following means.
The invention according to claim 1 is a key driving device that drives a key supported so as to be swingable with respect to the frame, and biases the key with respect to the frame in one of the swing directions. Means, a first magnet that moves in conjunction with the rocking of the key, and is fixed to the frame, and the key is swung in the one rocking direction by contacting the first magnet. A second magnet for restricting movement, and at least one of the two magnets is an electromagnet, and the magnetic poles of the two magnets in contact with each other coincide with each other in a state in which a current flows through the coil of the electromagnet. A lock driving device characterized by this is proposed.

  According to a second aspect of the present invention, there is provided a key drive device for driving a key supported so as to be swingable with respect to the frame, and biasing the key toward one of the swing directions with respect to the frame. A biasing means, and the biasing means is fixed to the other end of the bar-like member that swings relative to the frame so that one end becomes a fulcrum in conjunction with the swinging of the key. A first magnet that urges the key in the one swinging direction by its own weight, and controls the swinging of the key in the one swinging direction by contacting the first magnet. A second magnet is fixed to the frame, and at least one of the two magnets is an electromagnet, and when a current is passed through the coil of the electromagnet, the magnetic poles of the two magnets that are in contact with each other match. The key drive device characterized by the above is proposed.

Note that the contact between the first magnet and the second magnet includes both the direct contact of the two magnets and the contact via the spacer.
According to the key driving devices according to these inventions, when the current is not flowing through the coil, the first magnet comes into contact with the second magnet by the biasing force of the biasing means, so that the initial position where the key is stationary Will be placed. In this state, when a current is passed through the coil of the electromagnet, the magnetic poles of the two magnets in contact with each other coincide with each other, so that a repulsive force is generated between the two magnets. Then, the repulsive force causes the first magnet to move away from the second magnet, and in conjunction with the movement of the first magnet, the key swings the other against the biasing force. Will swing in the direction.

  Here, the repulsive force increases as the distance between the two magnets becomes shorter, and thus becomes maximum when the two magnets are in contact with each other. That is, it is possible to sufficiently obtain an initial driving force for driving the key at the initial position of the key by the repulsive force without increasing the current flowing through the coil. When the supply of current to the coil of the electromagnet is stopped, the key swings in one swinging direction by the biasing force of the biasing means, and stops at the initial position where the two magnets contact each other. It will be.

Further, as in the key driving device according to claim 2, when the urging means is constituted by the rod-shaped member and the first magnet, the rod-shaped member swings based on the movement of the first magnet due to gravity. Thus, the key is biased in one swinging direction. That is, the first magnet serves as a weight.
In addition, by providing the first magnet at the tip of the rod-shaped member, a sufficient biasing force to swing the key in one swinging direction via the rod-shaped member can be obtained without increasing the weight of the first magnet. Can get to.

  According to a third aspect of the present invention, in the key driving device according to the first or second aspect, the key is rocked together with the second magnet by restricting the rocking of the key in the other rocking direction. A regulating means for defining a moving range, and in a state in which the magnetic poles of the two magnets coincide with each other, the biasing force of the biasing means and the two magnets are arranged so that the key is located in the middle of the swinging range. A lock driving device characterized by balancing the repulsive force generated between them is proposed.

  According to the key driving device of the present invention, when the key is driven from one end of the swing range where the second magnet contacts the first magnet by the repulsive force to the middle of the swing range, the swing is performed. Compared with the case where the key is driven from one end of the range to the other end, the magnitude of the repulsive force can be reduced. That is, the magnitude of the current flowing through the coil of the electromagnet can be further reduced, and the key can be driven with more power saving.

  In the state where the key is arranged in the middle of the swing range, the key can be swung to the other end of the swing range by pressing the key with a finger. Therefore, when the key driving device according to the present invention is mounted on a keyboard instrument in which a plurality of keys are arranged side by side, as described above, the finger is moved by repulsive force to the middle of the swing range. The key to be pressed can be notified to the player of the keyboard instrument. That is, the key driving device can be used as a guide function for notifying the performer of the key to be pressed with the finger.

  The invention according to claim 4 proposes the key drive device according to any one of claims 1 to 3, wherein the other magnet is an electromagnet.

  The invention according to claim 5 is a keyboard instrument in which a plurality of keys supported so as to be swingable with respect to the frame are arranged side by side, and each key is driven. A key driving device, a performance information generating device for generating music data for automatic performance, and a key driving control device for passing a current through a coil of the electromagnet corresponding to the key selected based on the music data. We are proposing a keyboard instrument characterized by this.

According to the keyboard instrument of the present invention, since the key is driven based on the repulsive force generated between the two magnets, the repulsive force can be used to lock the key in the initial stage without increasing the current flowing through the coil. The initial driving force for driving can be obtained with a sufficient magnitude.
Further, each key of the keyboard instrument can be swung in association with the music data. Therefore, since the key to be pressed with the finger can be notified to the player of the keyboard instrument by the movement of each key, the movement of each key according to the music data can be directly felt by the finger.

  According to a sixth aspect of the present invention, there is provided a keyboard instrument according to the fifth aspect, further comprising sound generation means for generating a musical tone so as to synchronize with the driving of the key based on the music data. is doing.

  According to the first, second, and fifth aspects of the present invention, since the repulsive force between two magnets is used as a key driving force, a sufficient initial driving force can be obtained even with power saving. . Moreover, since it has the structure which drives a key using the repulsive force of a magnet, size reduction and weight reduction of a keyboard musical instrument provided with a key drive device can be achieved easily.

According to the second aspect of the present invention, by providing the first magnet with a role as a weight, it is possible to reduce the number of component parts of the lock driving device and to reduce its manufacturing cost.
Further, since the urging force for swinging the key in one swinging direction can be sufficiently obtained via the rod-shaped member without increasing the weight of the first magnet, the weight of the key driving device can be further reduced. Can be planned.

According to the invention which concerns on Claim 3, since the repulsive force of the two magnets which drive a key can be made small, a key can be driven with more power saving.
In addition, the key driving device can be used as a guide function for notifying a player of a keyboard instrument of a key to be pressed with a finger.

  According to the fourth aspect of the present invention, in the state where no current flows through the coils of the electromagnets, no attractive force is generated between the two magnets, so that the key can be easily pushed with fingers.

  According to the fifth aspect of the present invention, since the movement of each key corresponding to the music data can be directly felt by the finger that actually presses the key, it is possible to efficiently practice the keyboard instrument.

  According to the sixth aspect of the invention, it is possible to automatically play the keyboard instrument with power saving by generating the musical sound of the music data from the sound generation means in synchronization with the driving of the key based on the music data.

Hereinafter, a keyboard instrument according to an embodiment of the present invention will be described with reference to FIGS. The keyboard musical instrument of the present embodiment is configured by arranging a plurality of keys supported so as to be swingable with respect to a frame constituting the casing, and individually drives the keys of the keyboard as shown in FIG. A key driving device 1 for performing the performance, a performance information generating device 3 for outputting music data for automatic performance, and a key driving control device 5 for controlling the key driving device 1 so as to drive a key selected based on the music data. I have. Note that the music data is information on music that can be played on a keyboard instrument, for example, in the MIDI format.
The performance information generating device 3 reads out music data from a storage device (not shown) such as a RAM and a ROM built in the keyboard instrument and various storage media (not shown), and each musical sound of the music data is read by the key drive control device 5. Is output. The music data includes timing information (hereinafter referred to as tone generation timing information) for generating each tone according to the speed of the song, and information (hereinafter referred to as note information) for each tone of the song. And other information. Further, the timing at which each musical tone of the music data is output from the performance information generating device 3 to the key drive control device 5 is performed based on the sound generation timing information described above.

As shown in FIGS. 2 and 3, the rear end 7 b in the longitudinal direction of the key 7 of the keyboard instrument is attached to a fixed portion 11 integral with a frame (not shown) via a plate spring 9. The key 7 can swing about the rear end 7b as a fulcrum. One key driving device 1 is provided corresponding to each key 7 of the keyboard musical instrument, and is configured to drive the key 7 by magnetic force.
The key driving device 1 is disposed below the key 7 and is mounted so as to be swingable with respect to the frame, and a rear end (the other end) 13b of the swing lever 13. And a fixed magnet (second magnet) 19 fixed to a fixed portion 17 integral with the frame.

The swing lever 13 is arranged so that its longitudinal direction is the front-rear direction of the key 7, and is supported by the frame so that it can swing with its midway portion as a fulcrum F1. Since the front end 13 a of the swing lever 13 is engaged with the front end 7 a of the key 7, the swing lever 13 swings around the fulcrum F <b> 1 in conjunction with the swing of the key 7. Since the center of gravity of the swing lever 13 to which the movable magnet 15 is attached is shifted to the rear end 13b side from the fulcrum F1, the key 7 is attached to one of the swing directions (A direction) by the weight of the movable magnet 15. Will be energized. That is, the movable magnet 15 plays a role as a weight, so that the key 7 can have a keystroke sensation similar to an acoustic piano.
The fixed magnet 19 is disposed at a position that restricts the swing of the key 7 and the swing lever 13 in the A direction by contacting the movable magnet 15. That is, the above-described movable magnet 15 comes into contact with the fixed magnet 19 by its own weight.

The leaf spring 9 attached to the rear end 7b of the key 7 is not bent when the movable magnet 15 is in contact with the fixed magnet 19, or is bent so as to bias the key 7 in the A direction. Therefore, in this state, the key 7 is placed at the initial position where it is stationary.
When the key 7 or the swing lever 13 is swung in the swing direction (B direction) opposite to the A direction from the state in which the movable magnet 15 is in contact with the fixed magnet 19, the leaf spring 9 A biasing force that biases the key 7 and the swing lever 13 in the A direction is generated by the bending and the weight of the movable magnet 15. That is, the urging means 21 for urging the key 7 in the A direction is constituted by the leaf spring 9, the swing lever 13 and the movable magnet 15.

In addition, the key driving device 1 restricts the swing of the key 7 and the swing lever 13 in the B direction and regulates the swing range of the key 7 and the swing lever 13 together with the fixed magnet 19 (the restricting means). ) 23. The restricting member 23 is fixed to the frame so that the movable magnet 15 contacts when the key 7 and the swing lever 13 are swung in the B direction.
The movable magnet 15 and the fixed magnet 19 are respectively constituted by electromagnets including iron cores 15a and 19a and coils 15b and 19b wound around the cores 15a and 19a. The two coils 15b and 19b are electrically connected in parallel to the power source 25, and the switch 27 switches the energization from the power source 25 to the two coils 15b and 19b. In a state in which current flows through these two coils 15b and 19b, the respective iron cores 15a and 19a are arranged so that the magnetic poles of the movable magnet 15 and the fixed magnet 19 that are in contact with each other coincide with each other (in the illustrated example, the S poles). The coils 15b and 19b are wound around the coil.

  In this key driving device 1, the movable magnet 15 abuts against the fixed magnet 19 by the urging force of the urging means 21 in a state where no current flows through the coils 15b and 19b. Therefore, as shown in FIG. Will be placed in a stationary initial position. In this state, when the switch 27 is switched and a current is passed through the coils 15b and 19b, the magnetic poles of the movable magnet 15 and the fixed magnet 19 that are in contact with each other are both S poles as shown in FIG. Therefore, a repulsive force is generated between the movable magnet 15 and the fixed magnet 19. The repulsive force causes the movable magnet 15 to move away from the fixed magnet 19, that is, the swing lever 13 and the key 7 swing in the B direction against the biasing force of the biasing means 21. Become.

When the supply of current to the coils 15b and 19b is stopped, the key 7 is swung in the A direction by the urging force of the urging means 21, and the movable magnet 15 and the fixed magnet 19 are in contact with each other. 7 will stop at the initial position.
In addition, since the said repulsive force becomes so large that the distance of the movable magnet 15 and the fixed magnet 19 is near, it becomes the maximum in the state in which the movable magnet 15 and the fixed magnet 19 contacted each other. That is, the initial driving force for driving the key 7 at the initial position of the key 7 can be sufficiently obtained without increasing the current flowing through the coils 15b and 19b.

For example, as the iron cores 15a and 19a constituting the movable magnet 15 and the fixed magnet 19, respectively, a ferrite having a relative permeability of 2000 formed in a cylindrical shape having a diameter of 14 mm and a length of 30 mm is used. As the coils 15b and 19b constituting the circuit 19, respectively, a copper wire having a diameter of 0.2 mm wound around the iron cores 15a and 19a having the above dimensions is used 1200 times.
In the movable magnet 15 and the fixed magnet 19 having the above dimensions, the movable magnet 15 floats from the fixed magnet 19 when a current of 1 A is passed through the coils 15b and 19b. At this time, a magnetic repulsive force of about 0.3 N is generated between the movable magnet 15 and the fixed magnet 19. The magnitude of this magnetic repulsive force is sufficient to cause the key 7 and the swing lever 13 to swing.

Further, in the lock driving device 1, the biasing is performed so that the movable magnet 15 is arranged at a position where the movable magnet 15 does not contact any of the fixed magnet 19 and the regulating member 23 in a state where the current flows through the coils 15 b and 19 b. The biasing force of the means 21 and the repulsive force generated between the movable magnet 15 and the fixed magnet 19 are balanced. In order to make the urging force and the repulsive force uniform, for example, the magnitude of the current flowing through the coils 15b and 19b may be adjusted. As a result, the key 7 is positioned in the middle of the swinging range in the state where the current flows through each of the coils 15b and 19b.
The switch 27 of the key drive device 1 is operated by the key drive control device 5 of the keyboard instrument. That is, the key drive control device 5 plays a role of switching the switch 27 of the key drive device 1 corresponding to the predetermined key 7 based on the music data output from the performance information generating device 3.

Further, as shown in FIG. 4, the keyboard instrument includes a key-press detecting device 31 that individually detects that each key 7 has swung in the B direction to a position regulated by the regulating member 23, and a key-press detecting device. And sound generation means 33 for generating a musical sound corresponding to the rocked key 7 based on the detection result output from 31. The sound generation means 33 includes a sound source 35 that stores actual waveform data having a pitch corresponding to each key 7 and various timbres, a sound generation device 37 that outputs waveform data, and a detection result of the key press detection device 31. On the basis of this, a predetermined waveform data is read from the sound source 35, and a sound generation control device 39 for outputting the waveform data from the sound generation device 37 is constituted. Here, the sound generator 37 corresponds to, for example, an amplifier or a speaker of an audio device.
With the above configuration, the waveform data corresponding to the key 7 is output from the sound generator 37 by pressing the key 7 with a finger and swinging it to the position regulated by the regulating member 23.
The sound generation control device 39 reads predetermined waveform data corresponding to each musical tone of the music data output from the performance information generating device 3 from the sound source 35, and this waveform data is read out from the sound generation timing information, note information, It is also configured to output from the sound generator 37 by controlling based on other information. That is, the sound generation means 33 can generate a musical sound based on the music data output from the performance information generating device 3 instead of the input from the key depression detecting device 31 described above.

The operation of the keyboard instrument configured as described above will be described below.
As shown in FIG. 5, first, the performance information generating device 3 reads music data including pronunciation timing information and note information (step S1), and outputs each musical tone of the music data to the key drive control device 5 (step S1). S2). Specifically, each tone of the music data is output to the key drive control device 5 based on the sound generation timing information of the music data. Next, the key drive control device 5 controls the switch 27 of the key drive device 1 attached to the key 7 corresponding to the pitch of each musical tone based on the note information of the music data, and currents are supplied to the coils 15b and 19b. (Step S3). At this time, due to the repulsive force generated between the movable magnet 15 and the fixed magnet 19, the key 7 corresponding to the musical sound swings in the B direction against the biasing force of the biasing means 21 from its initial position. .

In this case, a current is continuously supplied to each of the coils 15b and 19b while the sound generation timing information is ON, that is, according to the length of the musical tone of the music data. That is, in accordance with the end of the musical tone of the music data, the key drive control device 5 controls the switch 27 to cut off the energization of the coils 15b and 19b by the power supply 25. As a result, the key 7 swings in the A direction by the urging force of the urging means 21 and returns to the initial position.
Then, it is determined whether or not the musical sound of the music data to be output to the key drive control device 5 remains (step S4). If it is determined that the music data to be output remains, the process returns to step S2. The performance information generating device 3 outputs the next musical sound of the music data to the key drive control device 5. If it is determined in step S4 that no musical sound to be output remains in the music data, the driving of the key 7 based on the music data is terminated.

When operating the keyboard musical instrument as described above, even if each key 7 is driven by the key driving device 1, the key 7 is located in the middle of the swing range and is restricted by the restriction member 23. The waveform data is not output from the sound generation device 37 without reaching the musical sound of the music data, that is, the sound generation timing and note (pitch) corresponding to the music sound.
Therefore, when the player searches for the key 7 located in the middle of the swinging range and further presses it with his / her finger, the key depression detecting device 31 operates for the first time, and the sound generator 37 corresponds to the key 7 based on the detection result. Since waveform data is output, it can be used to practice music. That is, it is useful as a guide function for notifying the player of the keyboard instrument of the key 7 to be pressed with the finger according to the music data, the movement of swinging each key 7 to the middle of the swing range according to the music data. Can do.

As described above, according to the key driving device 1 and the keyboard instrument including the same according to this embodiment, the repulsive force of the movable magnet 15 and the fixed magnet 19 is used as the driving force of the key 7, so that power saving is achieved. However, a sufficient initial driving force can be obtained. Since the key 7 is driven using the repulsive force, the key driving device 1 and the keyboard instrument can be easily reduced in size and weight.
Moreover, by providing the movable magnet 15 with a role as a weight, the number of components of the key driving device 1 can be reduced and the manufacturing cost can be reduced. Further, by providing the movable magnet 15 at the rear end 13b of the swing lever 13, an urging force for swinging the key 7 in the A direction via the swing lever 13 can be obtained without increasing the weight of the movable magnet 15. You can get enough. Therefore, the weight of the lock driving device 1 can be further reduced.

Further, when the key 7 is driven from the initial position to the middle of the swing range by the repulsive force of the movable magnet 15 and the fixed magnet 19, the key 7 is driven from the initial position to a position regulated by the regulating member 23. Compared with the case where it does, the magnitude | size of a repulsive force can be made small. That is, the magnitude of the current flowing through each of the coils 15b and 19b can be further reduced, and the key 7 can be driven with further power saving.
Further, since both the movable magnet 15 and the fixed magnet 19 are composed of electromagnets, no attractive force is generated between the movable magnet 15 and the fixed magnet 19 in a state where no current flows through each coil. Therefore, it is possible to easily press the key 7 with a finger, and to prevent the keying feeling of the key 7 from being impaired.

Further, according to this keyboard instrument, each key 7 of the keyboard instrument can be swung in association with the music data, so that the key 7 to be pressed with a finger by the movement of each key 7 is notified to the player of the keyboard instrument. can do. Therefore, it becomes possible to directly sense the movement of each key 7 according to the music data not only with the sight but also with fingers, so that the music can be practiced efficiently. In addition, since the performer can further press the key 7 located in the middle of the swing range with his / her finger, he / she can practice the music without impairing the feeling of playing the keyboard instrument with his / her finger.
Furthermore, since the performer can directly feel the movement of each key 7 according to the music data with his / her finger, the key 7 is compared with the case where the corresponding key 7 is pressed with the finger after visually recognizing the key 7 to be pressed. The reaction speed of the finger to press can be improved. In addition, music can be practiced without relying on vision, so even performers with low vision can practice efficiently.

  In the above-described embodiment, when the key drive control device 5 controls the switch 27 of the key drive device 1 corresponding to each musical tone of the music data, each coil 15b according to the volume of each musical tone included in the music data. , 19b may be changed in magnitude. That is, the current flowing through the coils 15b and 19b may be increased as the volume of the musical sound is increased. In this case, since the swing stroke of the key 7 changes according to the magnitude of the current flowing through each of the coils 15b and 19b, it is possible to directly sense the strength of the musical sound in the music data with the fingers.

Further, even if each key 7 is driven by the key driving device 1 based on each musical tone of the music data, the waveform data corresponding to each musical tone is not output from the sounding device 37, but this is not limited thereto. For example, waveform data corresponding to each tone may be output from the sound generation device 37 so as to be synchronized with the driving of the key 7 based on each tone of the music data. In this case, for example, as shown in FIG. 6, each musical tone of the music data is output from the performance information generating device 3 to both the key drive control device 5 and the sound generation control device 39. At this time, the sound generation control device 39 reads out predetermined waveform data corresponding to each musical tone of the music data from the sound source 35, and based on the sound generation timing information, note information and other information from the performance information generating device 3. And output from the sound generator 37.
When such an operation is performed, for example, automatic performance with a keyboard instrument based on music data can be performed. Even in this automatic performance, since the repulsive force between the movable magnet 15 and the fixed magnet 19 is used, automatic performance with reduced power consumption is possible.

Here, the waveform data output from the sound generation device 37 based on the music data may have the same pitch, tone, and the like as the waveform data output from the sound generation device 37 based on the detection result of the key press detection device 31. However, it may have different pitches or timbres. Selection of the pitch and tone color of the waveform data may be performed by the sound generation control device 39. When the waveform data based on the music data and the waveform data based on the detection result of the key press detection device 31 are different, the player of the keyboard instrument plays the musical sound of the musical composition data and the musical sound being played with his / her fingers. Since they can be easily compared, the music can be practiced efficiently.
In addition, the waveform data is output from the sound generation device 37 based on the music data and the detection result of the key press detection device 31. However, the present invention is not limited to this and may not be output. In this case, the music can be practiced without causing trouble to the surroundings.

The performance information generating device 3 outputs each tone of the song data to the key drive control device 5 based on the tone generation timing information included in the song data, and causes the tone generator 37 to output waveform data corresponding to each tone. However, the present invention is not limited to this. For example, after detecting that the key 7 corresponding to the musical tone of the music data is pushed by a finger, the next musical tone is output from the performance information generating device 3 to the key drive control device 5. The sound generation device 37 may output waveform data corresponding to the next musical sound. In order to perform such an operation, for example, the detection result of the key depression detecting device 31 is output to the performance information generating device 3, and whether or not the key 7 corresponding to the musical tone of the music data is depressed in the performance information generating device 3. Can be determined. Then, based on the determination result, the next musical sound may be output from the performance information generating device 3 to the key drive control device 5, or the waveform data corresponding to the next musical sound may be output from the sound generation control device 39.
In this case, the music player can practice the music while checking the keys 7 to be pressed in the music one by one, which can be useful for the practice of a player who is unfamiliar with the music performance.

Further, for example, according to the difference between the speed of the music and the performance speed of the player who presses the key 7, the timing at which each tone of the song data is output to the key drive control device 5 and the waveform data corresponding to each tone are displayed. The timing of output from the sound generator 37 may be changed. In order to perform such an operation, for example, the detection result of the key depression detecting device 31 is output to the performance information generating device 3, and the performance information generating device 3 calculates the difference between the speed of the music and the performance speed of the performer. Based on this calculation result, the timing for outputting the next musical tone to the key drive control device 5 and the timing for outputting the waveform data corresponding to the next musical tone from the sounding device 37 may be calculated.
In this case, since the key 7 corresponding to each musical tone is swung according to the performance speed of the performer, the music can be efficiently practiced even if the performance speed of the performer varies.

In addition, the urging unit 21 is configured by the leaf spring 9, the swing lever 13, and the movable magnet 15. However, the urging unit 21 is not limited thereto, and may be configured by at least one of them. That is, the urging force of the urging means 21 may be only the elastic force of the leaf spring 9 or only the weight of the movable magnet 15.
Further, the restricting member 23 is disposed at a position where the restricting member 23 comes into contact with the movable magnet 15. However, the restricting member 23 is not limited to this. 19 and the key 7 and the swing lever 13 may be arranged at positions that define the swing range. That is, the regulating member 23 may be disposed at a position where it comes into contact with the swing lever 13 or the key 7, for example.

The movable magnet 15 is fixed to the swing lever 13 that is engaged with the front end 7a of the key 7 and swings in conjunction with the swing of the key 7. However, the present invention is not limited to this. 7 only needs to be provided at a position to move in conjunction with the swinging motion of 7.
That is, for example, as shown in FIGS. 7 and 8, even if the movable magnet 15 is embedded on the rear end 7 b side of the key 7 and the fixed magnet 19 is disposed on the upper side of the key 7, the key driving device 41 is configured. I do not care. In this configuration, the movable magnet 15 may be brought into contact with the fixed magnet 19 by the biasing force of the leaf spring 9 that biases the key 7 in the A direction. In this configuration, for example, by arranging the regulating member 23 below the key 7, the key 7 can be brought into contact with the regulating member 23 when it is swung in the B direction.
In the case of this configuration, the movable magnet 15 cannot be used as the urging means 21 similar to that in the above embodiment, but the swing lever 13 is not required, so that the configuration of the key drive device 41 is simplified and a keyboard instrument is obtained. Can be reduced in size and weight, and the manufacturing cost can be reduced.

For example, as shown in FIGS. 9 and 10, an extension rod (bar-shaped member) 53 that integrally extends in the longitudinal direction from the rear end 7 b of the key 7 is formed, and the tip (other end) of the extension rod 53 is formed. The key driving device 51 may be configured by embedding the movable magnet 15 in 53b.
In the key driving device 51 having this configuration, the key 7 and the extending rod 53 swing together around the same fulcrum F2. The fulcrum F2 is located between the key 7 and the extension rod 53, that is, on the base end (one end) 53a side of the extension rod 53. The fixed magnet 19 is disposed at a position where the swing of the key 7 and the extending rod in the A direction is restricted by contacting the movable magnet 15, that is, the lower side of the distal end 53 b of the extending rod 53. It is arranged in.

Since the movable magnet 15 is attached to the tip 53b of the extension rod 53, the center of gravity of the key 7 and the extension rod 53 is shifted from the fulcrum F2 toward the extension rod 53. That is, the key 7 is urged in the A direction by the weight of the movable magnet 15. A coil spring 55 is provided at the front end 7a of the key 7 to urge the key 7 and the extending rod 53 in the A direction. Therefore, the movable magnet 15, the extending rod 53, and the coil spring 55 constitute a biasing means that biases the key 7 in the A direction.
This lock driving device 51 also has the same effect as the above embodiment.

In addition, the movable magnet 15 and the fixed magnet 19 are not limited to being in direct contact with each other, and may be in contact via a spacer, for example. Further, when this spacer is formed of a cushioning material such as felt, the shock generated when the movable magnet 15 and the fixed magnet 19 come into contact can be reduced by the cushioning material. It is possible to prevent the generation of impact sounds that the magnets 19 collide with each other.
Moreover, although both the movable magnet 15 and the fixed magnet 19 are configured by electromagnets, the present invention is not limited to this. For example, one of the movable magnet 15 and the fixed magnet 19 is configured by an electromagnet, and the other is permanent. It may be configured by a magnet. In the case of this configuration, the permanent magnets may be arranged so that the magnetic poles of the movable magnet 15 and the fixed magnet 19 facing each other coincide with each other when current is passed through the coils 15b and 19b of the electromagnet.

Further, in the state where the current flows through each of the coils 15b and 19b, the key 7 is arranged in the middle of the swinging range. However, the present invention is not limited to this. It may be arranged at a position where swinging is restricted.
Furthermore, although the key drive device 1 is mounted on a keyboard instrument including the sound generation means 33 that generates an electronic sound, the key drive device 1 is not limited to this, and is mounted on a grand piano or an upright piano that strikes a string with a hammer. It does not matter.

  As mentioned above, although embodiment of this invention was explained in full detail with reference to drawings, the concrete structure is not restricted to this embodiment, The design change etc. of the range which does not deviate from the summary of this invention are included.

It is a block diagram which shows the structure for driving a key based on music data in the keyboard musical instrument which concerns on one Embodiment of this invention. It is a schematic perspective view which shows the key drive device attached to the keyboard musical instrument which concerns on one Embodiment of this invention. FIG. 3 is a schematic perspective view showing a state in which a current is passed through each coil in the key driving device of FIG. 2. It is a block diagram which shows the structure for generating the musical sound corresponding to each key in the keyboard musical instrument which concerns on one Embodiment of this invention. 5 is a flowchart for driving a key based on music data in a keyboard instrument according to an embodiment of the present invention. It is a block diagram which shows the structure for synchronizing the drive of a key and generation | occurrence | production of a musical tone based on music data in the keyboard musical instrument which concerns on other embodiment of this invention. It is a schematic perspective view which shows the key drive device which concerns on other embodiment of this invention. FIG. 8 is a schematic perspective view showing a state in which a current is passed through each coil in the key driving device of FIG. 7. It is a schematic perspective view which shows the keyboard musical instrument which concerns on other embodiment of this invention. FIG. 10 is a schematic perspective view showing a state in which a current is passed through each coil in the key driving device of FIG. 9.

Explanation of symbols

1, 41, 51 ... Key drive device, 3 ... Performance information generating device, 5 ... Key drive control device, 7 ... Key, 13 ... Oscillating lever (bar-shaped member), 13b ..Rear end (other end), 15 ... Movable magnet (first magnet), 15b, 19b ... Coil, 19 ... Fixed magnet (second magnet), 21 ... Biasing means , 23 ... Restriction member (regulation means), 33 ... Sound generation means, 53 ... Extension rod (bar-shaped member), 53a ... Base end (one end), 53b ... Tip (other end) , F1, F2 ... fulcrum

Claims (6)

A key driving device for driving a key supported to be swingable with respect to a frame,
Urging means for urging the key with respect to the frame in one of the swing directions;
A first magnet that moves in conjunction with the rocking of the key;
A second magnet that is fixed to the frame and that regulates swinging of the key in the one swinging direction by contacting the first magnet;
At least one of the two magnets comprises an electromagnet;
A key driving device characterized in that the magnetic poles of two magnets in contact with each other coincide with each other in a state in which a current flows through the coil of the electromagnet. A key driving device for driving a key supported to be swingable with respect to a frame,
Urging means for urging the key to one of its swing directions with respect to the frame;
The biasing means is a rod-like member that swings with respect to the frame so that one end serves as a fulcrum in conjunction with the swinging of the key, and is fixed to the other end of the rod-like member and holds the key by its own weight. A first magnet biasing in one swinging direction,
A second magnet that regulates the swinging of the key in the one swinging direction by contacting the first magnet is fixed to the frame;
At least one of the two magnets comprises an electromagnet;
A key driving device characterized in that when a current is passed through a coil of the electromagnet, the magnetic poles of the two magnets in contact with each other coincide. A restricting means for restricting the rocking of the key in the other rocking direction and defining the rocking range of the key together with the second magnet;
In a state where the magnetic poles of the two magnets coincide with each other, the urging force of the urging means and the repulsive force generated between the two magnets are balanced so that the key is located in the middle of the swing range. The key driving device according to claim 1, wherein the key driving device is provided.   The key driving device according to any one of claims 1 to 3, wherein the other magnet is an electromagnet. A keyboard instrument in which a plurality of keys supported so as to be swingable with respect to the frame are arranged side by side,
The key driving device according to any one of claims 1 to 4, which drives each key;
A performance information generator for generating music data for automatic performance;
A keyboard instrument comprising: a key drive control device for causing a current to flow through a coil of the electromagnet corresponding to the key selected based on the music data. 6. The keyboard instrument according to claim 5, further comprising sound generation means for generating a musical sound so as to synchronize with the driving of the key based on the music data.

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