JP5098712B2 - Locking device - Google Patents

Description

  The present invention relates to a lock driving device.

A natural keyboard instrument such as an acoustic piano is configured such that a live sound is generated when a hammer that rotates with a key press strikes a string. This type of natural keyboard instrument is provided with a so-called action mechanism between the key and the hammer, and the player receives a unique reaction force (key braking force) from the key by this action mechanism. That is, in a natural keyboard instrument, by providing an action mechanism, a unique key touch feeling can be obtained.
On the other hand, a conventional electronic keyboard instrument that generates an electronic sound, such as an electronic keyboard, is provided with a mechanical mechanism such as a spring or a weight member that returns the key to the initial position. The key is operated against the return force of the weight member. For this reason, the touch feeling of the key in an electronic keyboard musical instrument differs greatly from the touch feeling in a natural keyboard musical instrument.

Conventionally, a key driving device for driving the key to change the reaction force against the key pressing and a control device for controlling the same have been proposed so that the touch feeling similar to that of the natural keyboard instrument can be obtained with this electronic keyboard instrument. (For example, refer to Patent Document 1). For example, a solenoid is used as the key driving device.
In such a configuration, as shown in Patent Document 2, for example, a plunger constituting a solenoid is connected to a key so that the reaction force can be changed. Here, a key that swings around a fulcrum is connected to a plunger of a solenoid that moves linearly through a sliding mechanism that includes a plurality of members (such as intermediate members and shafts). That is, the shift generated in the connecting portion between the key that the sliding mechanism swings and the plunger that moves linearly is absorbed.
Japanese Patent No. 3772491 Japanese Patent No. 3191327

  However, as described in Patent Document 2, when the plunger and the key are connected via a sliding mechanism including a plurality of members, rattling occurs between the plurality of members. This makes it difficult to control the key driving device, and unnaturalness remains in the touch feeling of the key when the key is pressed.

  In view of the above circumstances, an object of the present invention is to provide a key driving device capable of improving the touch feeling of a key.

In order to solve the above problems, the present invention proposes the following means.
That is, the key drive device of the present invention is a key drive device that drives a key supported so as to be swingable with respect to the frame, and includes a plunger that moves in an arc in conjunction with the swing of the key, and the frame. A solenoid having a substantially cylindrical electromagnet that is fixed and inserted through the plunger. The plunger is formed in an arc shape extending along the direction of the arc motion, and at least the direction of the arc motion of the plunger is One end in the longitudinal direction is made of a magnetic material.

Further, the key driving device of the present invention is connected to the key and supported so as to be able to swing so as to interlock with the swing of the key, and biases the key in one swinging direction by its own weight. A weight member is provided, and the plunger is formed in an arc shape centering on a fulcrum shaft of swinging of the weight member, and the other end is integrally fixed to the weight member.
The weight member connected to the key plays a role of generating a reaction force of the key pressing operation by its own weight when the key is manually pressed to swing the key in the other swinging direction. .

  Further, in the key drive device of the present invention, the plunger is formed in an arc shape centering on a fulcrum shaft of the key swing, and the other end is integrally fixed to the key. And

According to the key driving device according to these inventions, when a current is passed through the electromagnet, the magnetic force of the electromagnet acts on one end of the plunger so that the plunger moves in a circular arc, so that the key can be driven. . Here, since the plunger is formed in an arc shape corresponding to the swing of the key or weight member, the plunger is inserted inside the cylindrical electromagnet even if the plunger is integrally fixed to the key or weight member. be able to.
In addition, when manually pressing the key, the arc-shaped plunger moves in an arc in conjunction with the swing of the key. Therefore, as described above, even if the plunger is fixed to the key or weight member integrally, the plunger Can be inserted inside the cylindrical electromagnet.

When the plunger is integrally fixed to the key, the plunger is connected to the key so as to be swingable so as to be interlocked with the swing of the key, and the key is held by its own weight. A weight member that biases one side in the swing direction may be provided, and the plunger may be configured as a mass body that biases the key toward the other in the swing direction by its own weight.
In this case, the plunger functions as a counterweight for the weight member, and the weight of the weight member and the plunger increases the moment of inertia of the entire system including the key and the weight member. Without being fixed to the key, it is possible to improve a dynamic mass feeling and a feeling of playing when the key is manually depressed.

Moreover, the key drive device of the present invention is characterized in that one end of the plunger is formed larger than the diameter of the other part.
In this case, even if the whole plunger is made of a magnetic material, the magnetic force of the electromagnet acts most on one end of the plunger, so that the plunger can be reliably moved in an arc by the magnetic force of the electromagnet. Since the plunger is easily manufactured by forming the whole plunger from a magnetic material, the manufacturing efficiency of the key driving device can be improved and the manufacturing cost can be reduced.
In addition, when making the plunger fixed to the key function as a mass body, the weight of a plunger can also be effectively increased by forming it as a diameter dimension large as mentioned above.

Furthermore, the key drive device of the present invention is characterized in that the plunger is arranged closer to the outer peripheral side of the arc shape than the center of the cross section of the electromagnet perpendicular to the longitudinal direction.
When the electromagnet is configured by winding the coil wire many times so as to form the same arc shape as the plunger, the density of the coil wire is different between the inner circumference side and the outer circumference side of the arc shape of the electromagnet, The strength of the magnetic field of the electromagnet on the inner peripheral side is stronger than the strength of the magnetic field on the outer peripheral side.
Here, by arranging the plunger as described above, the strength of the magnetic field acting on one end of the plunger can be made substantially equal with respect to the direction intersecting the direction of the arc motion of the plunger, that is, with respect to the intersecting direction. The magnetic force of the electromagnet acting on one end of the plunger can be kept low. For this reason, the plunger can be efficiently driven even with a small electric power, and the drive control of the key can be easily performed.

Moreover, the key drive device of the present invention is characterized in that two electromagnets are arranged side by side along the longitudinal direction of the plunger.
In the case of this configuration, even if one end of the plunger is a simple magnetic material such as iron by selectively switching the energizing electromagnet in a state where the one end of the plunger is arranged between these two electromagnets. The moving direction (driving direction) of the plunger can be easily switched. Therefore, the key can be driven both in the same direction as the key pressing direction and in the opposite direction. For example, in the key pressing operation, the key can be driven to selectively increase / decrease the key reaction force.

Furthermore, the key drive device of the present invention is characterized in that one end of the plunger is formed of a permanent magnet having magnetic poles formed at both ends in the longitudinal direction.
In this case, the driving direction of the plunger can be easily switched because the permanent magnet can be selectively attracted and repelled only by switching the direction of the current applied to the same electromagnet. Therefore, the key can be driven both in the same direction as the key pressing direction and in the opposite direction.

The key driving device of the present invention is characterized by comprising a yoke made of a magnetic material and formed in a substantially cylindrical shape so as to cover the outer peripheral side of the electromagnet.
In this case, when a current is passed through the electromagnet, the magnetic field generated around the electromagnet can be stabilized, so that a sufficient driving force for driving one end of the plunger can be obtained even if the current passed through the electromagnet is small. it can. That is, the key can be driven with power saving.

Furthermore, the key driving device of the present invention is characterized in that the thickness of the yoke on the outer peripheral side of the arc shape is formed larger than the thickness of the yoke on the inner peripheral side of the arc shape. To do.
In this case, even if the electromagnet is configured by winding the coil wire many times so as to form an arc shape similar to that of the plunger, the magnetic field strength of the electromagnet is approximately equal on the inner circumference side and the outer circumference side of the arc shape. It can be. For this reason, even if the plunger is arranged at the center of the cross section of the electromagnet perpendicular to the moving direction, the strength of the magnetic field acting on one end of the plunger can be made substantially equal in the direction intersecting the moving direction of the plunger. . Therefore, the plunger can be efficiently driven even with a small electric power, and the key drive control can be easily performed.

  According to the present invention, since the key can be driven even if the plunger is integrally fixed to the key or the weight member, it is possible to prevent rattling between the key or the weight member and the plunger during the key depression. It becomes possible to improve the touch feeling of the key.

Hereinafter, a lock driving device according to an embodiment of the present invention will be described with reference to FIGS. 1 to 6.
As shown in FIG. 1, a plurality of keys 3 driven by a key driving device 1 are arranged side by side on a frame (not shown) that constitutes a casing of a keyboard device such as an electronic piano. The rear end 3b side is supported as a fulcrum shaft F1 so as to swing up and down with respect to the frame.
The key driving device 1 is provided one by one corresponding to each key 3, and is disposed on the lower side of the key 3 and is attached to the frame so as to be swingable with respect to the frame. A weight member 5, and a solenoid 7 that drives the key 3 and the swing lever 5.

The swing lever 5 is arranged so that its longitudinal direction is the front-rear direction of the key 3, and is supported by the frame so that the middle part thereof can swing about the fulcrum shaft F2. Since the front end 5a of the swing lever 5 is connected to the front end 3a of the key 3, the swing lever 5 swings about the fulcrum shaft F2 in conjunction with the swing of the key 3.
Here, since the center of gravity of the swing lever 5 is shifted to the rear end 5b side with respect to the fulcrum shaft F2, the key 3 is urged in one of the swing directions (A direction) by its own weight. It will be. That is, the rocking lever 5 plays a role as a weight, so that the key 3 can have a touch feeling similar to a natural keyboard instrument such as a grand piano.

A regulating member 11 that is fixed to the frame and regulates the rocking of the key 3 and the rocking lever 5 in the A direction is disposed below the rear end 5b of the rocking lever 5. 5 comes into contact with the regulating member 11 by its own weight. In this contact state, the key 3 is placed at the initial position where it is stationary. The key 3 and the swing lever 5 are also fixed to the frame at a position where the rear end 5b of the swing lever 5 is swung in the other swing direction (B direction) from the state where the rear end 5b is in contact with the regulating member 11. A restricting member 13 that restricts swinging in the B direction is disposed. As shown in FIG. 2, when the swing lever is in contact with the regulating member 13, the key 3 is arranged at a position where the key 3 is pushed in the B direction (hereinafter referred to as a pushed position). Become.
As described above, the rocking ranges of the key 3 and the rocking lever 5 are defined by these two restricting members 11 and 13.

The solenoid 7 drives the key 3 and the swing lever 5 in the A direction and the B direction. The solenoid 7 is fixed to the swing lever 5 and is fixed to the frame and a substantially rod-shaped plunger 15 formed in an arc shape. And substantially cylindrical electromagnets 17 and 19 through which the plunger 15 is inserted.
The plunger 15 is integrally fixed to a portion of the swing lever 5 on the rear end 5b side with respect to the fulcrum shaft F2. The plunger 15 protrudes in the B direction from the swing lever 5 and has an arc shape centered on the fulcrum shaft F2 of the swing lever 5. That is, when the swing lever 5 is swung, the plunger 15 moves in an arc around the fulcrum shaft F2 in conjunction with the swing of the swing lever 5, and the longitudinal direction of the plunger 15 is the arc motion. Will match the direction of.

Here, the rocking lever 5 and the base end (the other end) 15a in the longitudinal direction of the plunger 15 may be fixed by, for example, screwing, adhesive, welding, brazing, or fitting. A screw thread may be formed and screwed into the movable lever 5 and the base end 15a of the plunger 15 to be screwed together. Further, when the swing lever 5 and the plunger 15 are formed of the same material, for example, the swing lever 5 and the plunger 15 may be integrally formed.
The portion of the plunger 15 excluding its tip (one end) 15b is made of a non-magnetic material, and only the tip 15b is made of a magnetic material such as iron. Moreover, the diameter dimension of the plunger 15 is substantially the same over the longitudinal direction.

  Two electromagnets 17 and 19 are arranged side by side along the direction of arc movement (movement direction) of the plunger 15 accompanying the swing of the swing lever 5. Each of the electromagnets 17 and 19 is formed in an arc shape centered on the fulcrum shaft F <b> 2 of the swing lever 5 and has a substantially cylindrical bobbin 21 through which the plunger 15 is inserted, and a coil wire 23 wound around the outer periphery of the bobbin 21. , 25. In this embodiment, as shown in FIG. 3, the plunger 15 is arranged so as to substantially coincide with the center L1 of the cross section of the bobbin 21 perpendicular to the longitudinal direction. Further, in the illustrated example, the two electromagnets 17 and 19 share the same bobbin 21, but for example, individual bobbins may be provided.

The tip 15b of the plunger 15 is moved between the two electromagnets 17 and 19 in accordance with the swing of the key 3 and the swing lever 5. That is, as shown in FIG. 1, in the state where the key 3 and the swing lever 5 are arranged at the initial position, the tip 15 b of the plunger 15 is in the vicinity of the first electromagnet 17 positioned away from the swing lever 5. Has been arranged. Further, as shown in FIG. 2, in a state where the key 3 and the swing lever 5 are arranged at the push-off position, the tip 15 b of the plunger 15 is positioned closer to the swing lever 5 than the first electromagnet 17. The second electromagnet 19 is arranged in the vicinity.
Since the tip 15b of the plunger 15 is formed of a magnetic material, for example, when a current is passed through the first electromagnet 17, the key 3 and the swing lever 5 are driven in the A direction. For example, when a current is passed through the second electromagnet 19, the key 3 and the swing lever 5 are driven in the B direction. Note that the driving force of the key 3 changes according to the magnitude of the current flowing through the electromagnets 17 and 19.

In addition to the configuration described above, the key driving device 1 is also provided with a control means 31 for controlling the energization of the two electromagnets 17 and 19 and controlling the driving of each key 3, as shown in FIG. It has been. The control means 31 controls the driving of the key 3 during manual performance that is performed by the performer with a finger, and is particularly configured for the purpose of driving control to approximate the touch feeling of a key on a natural keyboard instrument such as a grand piano. Has been.
The control means 31 includes a position sensor 33 that detects the swing position of the key 3, a speed sensor 35 that detects the swing speed of the key 3, and an acceleration sensor 37 that detects the swing acceleration of the key 3.

The control means 31 includes an amplifier circuit 41, an A / D converter 43, an arithmetic circuit 45, a D / A converter 47, and a driver 49. With this configuration, the position sensor 33, the speed sensor 35, and the acceleration sensor 37 are provided. Control for driving the key 3 is performed on the basis of the operation state of the key 3 detected in step S2.
Further, the key drive device 1 is provided with a memory unit 51 and an operation unit 53, and the memory unit 51 performs a key press operation on the key 3 with fingers in a keyboard device or a natural keyboard instrument including the key drive device 1. The profile data is stored as a relationship between the stroke from the initial position to the fully-pressed position of the key 3 and the reaction force applied to the finger when the key is pressed (see FIG. 6). ).

Note that the profile data of the keyboard device (reference numeral C in FIG. 6) is stored in the memory unit 51 when the key driving device 1 does not drive the key 3. As for the natural keyboard instrument profile data (symbol D in FIG. 6), a plurality of types of natural keyboard instruments are stored in the memory unit 51. Further, a large number of these profile data are stored in association with the speed of the key pressing operation.
Further, the operation unit 53 selects, for example, profile data of a predetermined natural keyboard instrument from among a plurality of types of natural keyboard instruments described above by the performer, and the strength of reaction force in the profile data of the selected natural keyboard instrument. The operation to change is performed, and the data input in the operation unit 53 is stored in the memory unit 51.
Note that the selection of the profile data of the natural keyboard instrument means that the touch feeling pattern of the key 3 is selected. The change of the reaction force in the profile data of the natural keyboard instrument means, for example, changing the strength of the click feeling that occurs when the hammer roller of the action mechanism in the grand piano gets over the lever.

In the keyboard device configured as described above, when the key 3 is pressed with a finger, as shown in FIG. 6, a touch feeling pattern is selected in advance in the operation unit 53, or profile data of a natural keyboard instrument. Various data are input by changing the strength of the reaction force at (step S1).
Then, for example, when the key 3 is depressed from the initial position shown in FIG. 1 to the push-off position as shown in FIG. 2, the key 3 and the swing lever 5 swing in the B direction, and the rear end 5b is lifted. The reaction force due to inertia is transmitted to the finger.

At this time, as shown in FIG. 5, sensor signals indicating the rocking position, rocking speed and rocking acceleration of the key 3 are output from the position sensor 33, the speed sensor 35 and the acceleration sensor 37 to the amplifier circuit 41. In step S2, the amplifier circuit 41 amplifies the signal (step S3). The amplified sensor signal is digitized by the A / D converter 43 and input to the arithmetic circuit 45 (step S4).
Here, the arithmetic circuit 45 reads out the profile data C of the keyboard device and the profile data D of the natural keyboard instrument (see FIG. 6) according to the rocking speed of the key 3 included in the sensor signal from the memory unit 51 (step). In addition, various data input in the operation unit 53 are similarly read out (S5). The arithmetic circuit 45 corrects the profile data D of the natural keyboard instrument based on the various data.

Furthermore, as shown in FIG. 6, when there is a reaction force difference E, F between the two profile data C, D described above, the profile data C in the keyboard device approaches the profile data D of the natural keyboard instrument. As described above, the arithmetic circuit 45 creates a command signal for causing a current to flow through one of the two coil wires 23 and 25. The command signal includes the magnitude of the current flowing through the selected coil wires 23 and 25.
Specifically, for example, when the reaction force value of the profile data C in the keyboard device is lower than the reaction force value of the profile data D of the natural keyboard instrument (in the case of symbol E in the illustrated example), the arithmetic circuit 45 In order to increase the reaction force value of the profile data C, a command signal is generated to drive the key 3 in the A direction by applying a current to the first coil wire 23 (applying a reaction force to the key 3). The arithmetic circuit 45 also calculates the magnitude of the current flowing through the first coil wire 23 so that the reaction force value of the profile data C substantially matches the reaction force value of the profile data D of the natural keyboard instrument.

  For example, when the reaction force value of the profile data C in the keyboard device is higher than the reaction force value of the profile data D of the natural keyboard instrument (in the case of symbol F in the illustrated example), the arithmetic circuit 45 causes the profile of the keyboard device. In order to lower the reaction force value of the data C, a command signal is generated to drive the key 3 in the B direction (applying assist force to the key 3) by passing a current through the second coil wire 25. Then, the arithmetic circuit 45 also calculates the magnitude of the current flowing through the second coil wire 25 so that the reaction force value of the profile data C substantially matches the reaction force value of the profile data D of the natural keyboard instrument.

The command signal calculated as described above is output from the arithmetic circuit 45 to the D / A converter 47 and analogized in the D / A converter 47 as shown in FIG. 5 (step S7). , Input to the driver 49. Then, the command signal is converted into a current flowing through the coil wires 23 and 25 in the driver 49 (step S8), and this current is passed through the coil wires 23 and 25 designated by the driver 49 (step S9).
As a result, the plunger 15 is driven in the designated direction (step S10), and the touch feeling of the key 3 very close to the natural keyboard instrument is given. After step S10 is completed, the arithmetic circuit 45 determines whether or not the key pressing operation has ended based on the sensor signal from the position sensor 33 (step S11). If it is determined that the key 3 has not returned to the initial position, the process of step S2 is performed. If it is determined that the key 3 has returned to the initial position, the key 3 Drive control ends.

As described above, according to the lock driving device 1 according to this embodiment, when a current is passed through the coil wires 23 and 25 of the electromagnets 17 and 19, the magnetic force of the electromagnets 17 and 19 is applied to the tip 15b of the plunger 15. By acting, the plunger 15 moves in a circular arc, so that the key 3 can be driven. Here, since the plunger 15 is formed in an arc shape in accordance with the swing of the swing lever 5, even if the plunger 15 is fixed to the swing lever 5 integrally, the plunger 15 is formed into a cylindrical electromagnet 17, 19 can be inserted into the inside of a bobbin 21 constituting the body 19.
Also, when the key is manually depressed, the arc-shaped plunger 15 moves in an arc in conjunction with the rocking of the key 3, so that the plunger 15 is fixed integrally to the rocking lever 5 as described above. Also, the plunger 15 can be inserted inside the cylindrical bobbin 21.
From the above, according to the key driving device 1, it is possible to prevent the rattling between the swing lever 5 and the plunger 15 and improve the touch feeling of the key 3 when the key is depressed.

  Furthermore, by arranging the two electromagnets 17 and 19 along the direction of the arc motion of the plunger 15, the electromagnet 17 that is energized while the tip 15 b of the plunger 15 is arranged between the two electromagnets 17 and 19. , 19 can be selectively switched even when the tip 15b of the plunger 15 is a simple magnetic material such as iron. Therefore, the key 3 can be driven in both the same direction (B direction) and the reverse direction (A direction) as the key pressing direction. That is, as described above, during the key pressing operation, the key 3 can be driven to selectively increase / decrease the reaction force of the key 3.

In the above embodiment, the solenoid 7 is provided with the plunger 15 and the two electromagnets 17 and 19, but, for example, as shown in FIG. A yoke 63 formed in a substantially cylindrical shape so as to cover the outer peripheral side of the electromagnets 17 and 19 may be provided.
In the case of this configuration, when a current is passed through the coil wires 23 and 25 of the electromagnets 17 and 19, the magnetic field generated around the electromagnets 17 and 19 can be stabilized. Therefore, the current passed through the coil wires 23 and 25 is small. In addition, a sufficient driving force for driving the tip 15b of the plunger 15 can be obtained, and the key 3 can be driven with power saving. And in the case of the solenoid 61 of this structure, compared with the solenoid 7 of the said embodiment, the electric current sent through the coil wires 23 and 25 can be reduced from a half to about 1/3.
In the above configuration, only one yoke 63 is formed so as to cover both the two electromagnets 17 and 19, but the invention is not limited to this. For example, each of the electromagnets 17 and 19 is individually covered. Two may be formed.

Further, in the above embodiment, the plunger 15 is arranged so as to substantially coincide with the center L1 of the cross section of the bobbin 21 perpendicular to the longitudinal direction thereof. However, as shown in FIG. More preferably, it is arranged closer to the outer peripheral side of the arc shape than the center L1.
In the case where the electromagnets 17 and 19 are formed by winding the coil wires 23 and 25 many times so as to form the same arc shape as that of the plunger 15, the arcuate inner periphery of the electromagnets 17 and 19 is formed. Since the density of the coil wires 23 and 25 is different between the outer peripheral side and the outer peripheral side, the magnetic field strength of the electromagnets 17 and 19 on the inner peripheral side is stronger than the magnetic field strength on the outer peripheral side. This is because by arranging the plunger 15, the strength of the magnetic field acting on the tip 15 b of the plunger 15 can be made substantially uniform with respect to the direction intersecting the direction of the arc motion of the plunger 15. That is, when the plunger 15 is arranged as described above, the magnetic force of the electromagnets 17 and 19 acting on the tip 15b of the plunger 15 in the intersecting direction can be kept low. Therefore, in the case of the above configuration, the plunger 15 can be efficiently driven even with a small electric power, and the drive control of the key 3 can be easily performed.

In addition, as another structure which produces the effect mentioned above, for example, as shown in FIG. 9, while providing the substantially cylindrical yoke 65 which consists of a magnetic body in the outer peripheral side of each electromagnet 17 and 19, in the outer peripheral side of circular arc shape, For example, the thickness t1 of the yoke 65 may be larger than the thickness t2 of the yoke 65 on the inner peripheral side.
In the case of this configuration, even if each of the electromagnets 17 and 19 is formed by winding the coil wires 23 and 25 many times so as to form an arc shape similar to that of the plunger 15, Thus, the magnetic field strengths of the electromagnets 17 and 19 can be made substantially equal. For this reason, for example, even if the plunger 15 is arranged at the center L1 of the cross section of the bobbin 21 orthogonal to the longitudinal direction, the strength of the magnetic field acting on the tip 15b of the plunger 15 in the direction intersecting the longitudinal direction of the plunger 15 is increased. It can be made substantially equal. Therefore, as described above, the plunger 15 can be efficiently driven even with a small electric power, and the drive control of the key 3 can be easily performed.

Further, although the diameter dimension of the plunger 15 is substantially the same in the longitudinal direction, for example, as shown in FIGS. 10 and 11, the tip 15b of the plunger 15 is formed to be larger than the diameter dimension of other portions. It doesn't matter.
In this case, even if the plunger 15 is entirely formed of a magnetic material, the magnetic force of the electromagnets 17 and 19 most acts on the tip 15b of the plunger 15, so the plunger 15 is reliably driven by the magnetic force of the electromagnets 17 and 19. be able to. Then, by forming the plunger 15 as a whole with a magnetic material, the plunger 15 can be easily manufactured by punching or forging, etc., improving the manufacturing efficiency of the key driving device or the keyboard device, and reducing the manufacturing cost. Can be achieved.
Further, when the entire plunger 15 is formed of a magnetic material, for example, a portion of the swing lever 5 on the rear end 5b side of the fulcrum shaft F2 is formed of a magnetic material such as iron, so that the plunger 15 swings. The rear end 5b of the lever 5 can be integrally formed, and these can be easily manufactured.

Moreover, although all the solenoids 7 and 61 mentioned above were provided with the two electromagnets 17 and 19, it is not restricted to this, It is comprised so that at least the key 3 can be driven to both A direction and B direction. It only has to be done.
Therefore, for example, as shown in FIG. 12, the solenoid 71 has the same bobbin 21 as in the above embodiment and one electromagnet 18 composed of the coil wire 24 wound around the outer periphery of the bobbin 21, and a bobbin formed in an arc shape. 21 may be configured to include a plunger 16 that is inserted inside 21. And in this structure, the front-end | tip 16b of the plunger 16 consists of a permanent magnet which formed the magnetic pole in the both ends of the longitudinal direction.

In this case, the tip 16b of the plunger 16 made of a permanent magnet can be selectively attracted and repelled simply by switching the direction of the current applied to the coil wire 24 of the electromagnet 18, so the driving direction of the plunger 16 is changed. It can be switched easily. Therefore, even in this configuration, the key 3 can be driven in both the A direction and the B direction.
When the solenoid 71 having this configuration is driven and controlled by the control means of the above-described embodiment, reaction force differences E and F existing between the profile data C and D of the keyboard device and the natural keyboard instrument (see FIG. 6). ), The arithmetic circuit 45 creates a command signal including the direction and magnitude of the current flowing through the coil wire 24, and the driver 49 allows the current in the predetermined direction to flow through the coil wire 24 according to the command signal. That's fine.

For example, in the state where the plunger 16 is arranged as in the illustrated example, the reaction force value of the profile data C of the keyboard device is lower than the reaction force value of the profile data D of the natural keyboard instrument (indicated by the symbol E in the illustrated example) In this case, a current in the first direction may be passed through the coil wire 24 so that the plunger 16 is repelled by the magnetic force of the electromagnet 18. Further, for example, when the reaction force value of the profile data C of the keyboard device is higher than the reaction force value of the profile data D of the natural keyboard instrument (in the case of the symbol F in the illustrated example), the plunger 16 is moved by the magnetic force of the electromagnet 18. What is necessary is just to send the electric current of the 2nd direction opposite to a 1st direction to the coil wire 24 so that it may attract | suck.
Even in the case of a configuration including only one electromagnet 18, for example, as shown in FIG. 13, it is made of a magnetic material such as iron and is formed in a substantially cylindrical shape so as to cover the outer peripheral side of the coil wire 24 of the electromagnet 18. By providing the yoke 67, compared with the solenoid 71 shown in FIG. 12, the current flowing through the coil wire 24 can be reduced from half to about 1/3.

In addition, the base ends 15a of the plungers 15 and 16 constituting the solenoids 7, 61 and 71 are fixed to the swing lever 5. However, the present invention is not limited to this, and at least in conjunction with the swing of the key 3. What is necessary is just to be formed in the circular arc shape extended along the direction of this circular arc motion while arrange | positioning so that it may carry out circular arc motion.
That is, for example, as shown in FIG. 14, the base end 15 a of the plunger 15 may be integrally fixed to the front end 3 a of the key 3. In this case, the plunger 15 and the bobbin 21 may be formed in an arc shape with the fulcrum shaft F1 of the key 3 as the center, and the electromagnets 17 and 19 may be disposed at positions where the plunger 15 is inserted. Furthermore, the key 3 and the base end 15a of the plunger 15 may be fixed by, for example, screwing, adhesive, welding, brazing, or fitting, as in the above embodiment.
Even in this configuration, since the plunger 15 is formed in an arc shape corresponding to the swing of the key 3, even if the plunger 15 is integrally fixed to the key 3 as described above, the plunger 15 is inserted into the bobbin 21. Can be made. Therefore, rattling between the swing lever 5 and the plunger 15 can be prevented, and the touch feeling of the key 3 when the key is pressed can be improved.

Further, when the plunger 15 is fixed integrally to the key 3, the plunger 15 has a predetermined mass and is configured as a mass body that biases the key 3 in the other swinging direction (B direction). May be. In this case, the plunger 15 functions as a counterweight for the swing lever 5 and the inertia moment of the entire system including the key 3 and the swing lever 5 increases due to the weight of the swing lever 5 and the plunger 15. It is possible to improve a dynamic mass feeling and a feeling of playing response when manually pressing a key without fixing a separate weight to the key. In order to keep the static load at the time of key pressing constant, the mass of the swing lever 5 may be increased in accordance with the mass increase of the plunger 15.
Specifically, in order to effectively increase the weight of the plunger 15, for example, as shown in FIGS. 10 and 11, the tip 15b of the plunger 15 may be formed larger than the diameter of the other part. For example, as shown in FIG. 15, the base end 15a of the plunger 15 may be formed larger than the diameter of other portions. However, since the expansion of the diameter of the tip 15b of the plunger 15 is limited by the inner diameter of the bobbin 21, the diameter of the proximal end 15a of the plunger 15 that is not inserted into the bobbin 21 even when the key is depressed is increased. In this way, the weight of the plunger 15 can be increased more effectively.

  By the way, in order to increase the moment of inertia of the key 3, it is effective to provide the mass body as close to the front end 3a side of the key 3 as possible. Further, providing the plunger 15 close to the front end 3a side of the key 3 is also effective in that the driving force of the key 3 by the solenoids 7, 61, 71 can be reduced. Furthermore, it is preferable that the connecting portion 5 a of the swing lever 5 and the like are also arranged at the front end 3 a portion of the key 3. For this reason, the functional parts of the key driving device tend to be concentrated on the front end 3a of the key 3. However, the plunger 15 itself is configured as a mass body so that the plunger 15 has a plurality of functions. Thus, the space of the front end 3a portion of the key 3 can be effectively utilized.

  In addition, the control unit 31 of the above embodiment includes the position sensor 33, the speed sensor 35, and the acceleration sensor 37 as the operation detection sensors that detect the operation state of the key 3. As long as it has. That is, for example, when only the position sensor 33 is provided, the swing speed and acceleration of the key 3 may be calculated by differentiating the swing position of the key 3.

  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 schematic sectional side view which shows the key drive device which concerns on one Embodiment of this invention. It is a schematic sectional side view which shows the state which rock | fluctuated the key from the initial position in the key drive device of FIG. It is an expanded sectional side view which shows the solenoid which comprises the key drive device of FIG. It is a block diagram which shows the other structure with which the lock | rock drive apparatus of FIG. 1 is equipped. 3 is a flowchart showing key drive control in the key drive device of FIG. 1. 5 is an example of profile data of a keyboard device and a natural keyboard instrument stored in a memory unit of FIG. It is an expanded sectional side view which shows the solenoid of the key drive device which concerns on other embodiment of this invention. It is an expanded sectional side view which shows the solenoid of the key drive device which concerns on other embodiment of this invention. It is an expanded sectional side view which shows the solenoid of the key drive device which concerns on other embodiment of this invention. It is an expanded sectional side view which shows the solenoid of the key drive device which concerns on other embodiment of this invention. It is an expanded sectional side view which shows the solenoid of the key drive device which concerns on other embodiment of this invention. It is an expanded sectional side view which shows the solenoid of the key drive device which concerns on other embodiment of this invention. It is an expanded sectional side view which shows the solenoid of the key drive device which concerns on other embodiment of this invention. It is a schematic sectional side view which shows the key drive device which concerns on other embodiment of this invention. It is a schematic sectional side view which shows the key drive device which concerns on other embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Key drive device, 3 ... Key, 5 ... Swing lever (weight member), 7, 61, 71 ... Solenoid, 15, 16 ... Plunger, 15a ... Base end (Other end), 15b, 16b ... tip (one end), 17, 18, 19 ... electromagnet, 63, 65, 67 ... yoke, F1, F2 ... fulcrum shaft, L1 ... center

Claims (10)

A key driving device for driving a key supported to be swingable with respect to a frame,
A solenoid comprising a plunger that moves in an arc in conjunction with the rocking of the key, and a substantially cylindrical electromagnet that is fixed to the frame and through which the plunger is inserted,
The plunger is formed in an arc shape extending along the direction of the arc motion;
A key driving device characterized in that at least one end in the longitudinal direction of the plunger which forms the direction of the arc motion is made of a magnetic material. A weight member connected to the key and supported so as to be able to swing in conjunction with the swing of the key, and biasing the key in one of the swing directions by its own weight,
The said plunger is formed in the circular arc shape centering on the fulcrum axis | shaft of rocking | fluctuation of this weight member, and the other end is integrally fixed to the said weight member. Key drive device.   2. The key drive according to claim 1, wherein the plunger is formed in an arc shape centering on a fulcrum shaft of the key swing, and the other end is integrally fixed to the key. apparatus. A weight member connected to the key and supported so as to be able to swing in conjunction with the swing of the key, and biasing the key in one of the swing directions by its own weight,
4. The key driving device according to claim 3, wherein the plunger is configured as a mass body that urges the key in the other swinging direction by its own weight.   5. The key driving device according to claim 1, wherein one end of the plunger is formed to be larger than a radial dimension of the other portion.   6. The plunger according to any one of claims 1 to 5, wherein the plunger is arranged closer to an outer peripheral side of the arc shape than a center of a cross section of the electromagnet perpendicular to the longitudinal direction thereof. Key drive device.   7. The key driving device according to claim 1, wherein two of the electromagnets are arranged side by side along a longitudinal direction of the plunger.   7. The key driving device according to claim 1, wherein one end of the plunger is made of a permanent magnet having magnetic poles formed at both ends in the longitudinal direction.   The key driving device according to any one of claims 1 to 8, further comprising a yoke made of a magnetic material and formed in a substantially cylindrical shape so as to cover an outer peripheral side of the electromagnet.   10. The key driving device according to claim 9, wherein a thickness of the yoke on the outer peripheral side of the arc shape is formed larger than a thickness of the yoke on the inner peripheral side of the arc shape. .

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