JP2008122486A - Key driver - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce difference of required driving force and difference of stroke of plungers between adjoining two keys, in a key driver in which a plurality of electro-magnetic actuators are alternately arranged. <P>SOLUTION: The plurality of electro-magnetic actuators 110 are alternately arranged corresponding to the keys 10 in order to drive the plurality of keys 10 arranged in one line to a horizontal direction. The electro-magnetic actuators comprises a solenoid 112 and a plunger including a cylindrical main body 113a, and has a projection part 113b which projects from an upper face of the main body 113a. A driving member 114 attached to the projection part 113b drives the key 10 by supplying electricity to the solenoid 112. A transverse center position of the projection part 113b and the driving member 114 is made eccentric from a transverse center position of the main body 113a of the plunger 113 so that the distance in back and forth direction between the projection part 113b arranged back and forth and the transverse center of the driving member 114 is made short. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a key drive device that includes a plurality of electromagnetic actuators that respectively drive a plurality of keys arranged in a row in the horizontal direction, and each electromagnetic actuator is configured by a solenoid and a plunger.

Conventionally, in this type of key drive device, for example, as shown in Patent Document 1 below, a plurality of electromagnetic actuators including solenoids and plungers are arranged in a staggered manner. That is, among the plurality of keys, a plurality of electromagnetic actuators for driving every other plurality of keys in the arrangement direction are arranged on the first straight line extending in the lateral direction that is the arrangement direction of the plurality of keys. In addition, a plurality of electromagnetic actuators for driving the remaining plurality of keys among the plurality of keys are arranged on a second straight line parallel to the first straight line at the front position or the rear position. It was like that.
Japanese Patent Laid-Open No. 9-237082

  In the above-described conventional apparatus, by arranging a plurality of electromagnetic actuators in a staggered manner, it is necessary to avoid the restriction of the length in the lateral direction due to the width of the key and to drive the key with a certain large diameter. A solenoid that generates driving force can be used. However, on the other hand, by arranging a plurality of electromagnetic actuators in a staggered manner, the drive position of the drive unit that drives the key due to the displacement of the plunger is shifted in the front-rear direction between adjacent keys, and is necessary to drive the key The driving force differs between two adjacent keys, and the stroke of the plunger for driving the key differs between the two adjacent keys, and there is a problem that high-precision and good key driving cannot be performed.

  The present invention has been made in order to improve the conventional drawbacks in the case where a plurality of electromagnetic actuators are arranged in a staggered manner, and the object thereof is adjacent to a key drive device in which a plurality of electromagnetic actuators are arranged in a staggered manner. A key driving device capable of performing high-precision and good key driving by reducing the difference in driving force required for driving the key and the difference in the stroke of the plunger for driving the key in the two keys. Is to provide.

  In order to achieve the above object, a feature of the present invention is that a key driving device comprising a plurality of electromagnetic actuators respectively driving a plurality of keys arranged in a row in the lateral direction, each electromagnetic actuator comprising a solenoid and a plunger. A plurality of electromagnetic actuators for driving every other plurality of keys in the arrangement direction among the plurality of keys on a first straight line extending in a lateral direction that is an arrangement direction of the plurality of keys. And a plurality of electromagnetic actuators for driving the remaining plurality of keys respectively on a second straight line parallel to the first straight line at a front position or a rear position. An electromagnetic actuator in which a drive unit that is configured integrally with the plunger and drives the key by the displacement of the plunger is arranged on the first straight line with respect to the center position in the front-rear direction of the plunger. Is positioned shifted to the second straight side with respect to data, with respect to the second electromagnetic actuator disposed on a straight line in that is positioned shifted to the first straight line side. In this case, various planar shapes such as a circle, an oval, an ellipse, and a triangle can be adopted as the plane shape orthogonal to the axes of the solenoid and the plunger.

  In the present invention configured as described above, a drive unit configured integrally with the plunger of the electromagnetic actuator disposed on the first straight line and driving the key by the displacement of the plunger, and disposed on the second straight line The distance in the front-rear direction from the drive unit that is configured integrally with the plunger of the electromagnetic actuator and drives the key by the displacement of the plunger can be shortened. Therefore, according to the present invention, in a key driving device in which a plurality of electromagnetic actuators are arranged in a staggered manner, the difference in driving force required to drive the key between two adjacent keys and the key driving The difference in plunger stroke can be reduced, and high-precision and good key driving can be performed.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a plan view of a keyboard device of an electronic musical instrument provided with a key driving device of the present invention. 2A is a longitudinal side view of the keyboard device, and FIG. 2B is a diagram illustrating a state in which one key is driven by the key driving device in the longitudinal side view of the keyboard device of FIG. 2A. The keyboard device includes a plurality of keys 10 composed of white keys and black keys arranged in the horizontal direction. The plurality of keys 10 are assembled to a key frame 20 that is integrally formed of synthetic resin. The key frame 20 is fixed on a support base 30, and a plurality of swing levers 40 corresponding to the plurality of keys 10 are assembled to the key frame 20 below the plurality of keys 10.

  The key 10 is integrally formed of synthetic resin in a U-shaped cross-section with the lower part opened, and the rear end 11 is fitted into a recess provided at the rear end 21 of the key frame 20 and opened forward, and the rear end The front end portion 12 is supported by the key frame 20 so as to be swingable in the vertical direction with the side surface of the portion 11 as a fulcrum. A key guide 22 erected on the front end horizontal portion of the key frame 20 enters the front end portion 12 of the key 10 from below, and the front end portion 12 of the key 10 is vertically guided by the key guide 22 when the key is depressed. It is displaced to. Further, a long key stopper 23 with felt or the like superimposed on the front end horizontal portion is also extended and fixed in the lateral direction of the keyboard, and the stopper 23 restricts the downward displacement of the front end portion 12 of the key 10. However, the key stopper 23 does not restrict the downward displacement of the key 10 when the key is pressed normally during performance, and the front end lower end surface of the key 10 is separated from the upper surface of the key stopper 23 when the key is pressed normally. It is in. On the other hand, when a very large downward force is applied to the key 10, such as when a heavy object is placed on the key 10, the key stopper 23 regulates the downward displacement of the key 10. Thus, destruction due to abnormal deformation of the key 10 is prevented.

  On the lower surface of the front portion in the vicinity of the front end portion 12 of the key 10, a drive portion 13 is integrally formed so as to extend substantially vertically downward from the lower surface. The drive unit 13 is formed in a horizontal U-shape with the rear open, and the lower end is closed by a lower end 13a. An elastic member (not shown) is assembled on the lower surface of the lower end portion 13a.

  The swing lever 40 includes a lever base 41 made of synthetic resin and a mass body 42 made of metal. The lever base 41 is formed in a long and flat plate shape, and is arranged below the front portion of the key 10 with the longitudinal direction in the front-rear direction and the plate surface perpendicularly. The lever base 41 has a recess 41a whose axis is the lateral direction of the keyboard cut out at the center of the lower surface, and the recess 41a is formed thick in the axial direction. The recessed portion 41a is opened obliquely downward at the front and is assembled to the rotation support portion 25 provided at the upper end of the inclined plate 24 extending obliquely upward from the front lower end position of the key frame 20. The rotation support part 25 is extended in the keyboard lateral direction. Thereby, the swing lever 40 is supported by the key frame 20 so as to be swingable up and down.

  The swing lever 40 is biased forward (leftward in the figure) by a leaf spring 51. The leaf spring 51 engages with the concave portion 41 b of the lever base 41 at the front end, and enters the key 10 from the lower surface of the key 10 through the opening 26 provided in the intermediate portion of the key frame 20. The rear end portion of the leaf spring 51 is in contact with the inner surface of the rear end portion 11 of the key 10. At the front end of the lever base 41, a pair of legs 41c and 41d are formed that are divided into two forks in a vertical direction with a predetermined gap therebetween, and the upper leg 41c is shorter than the lower leg 41d. Is set. The lower end portion 13a of the drive unit 13 of the key 10 enters between the both leg portions 41c and 41d and engages with both leg portions 41c and 41d. Thus, when the key 10 is released, the front end of the key 10 is displaced upward due to the displacement of the front end of the swing lever 40 due to its own weight. On the other hand, when the key 10 is depressed, the lower end surface of the lower end portion 13a of the drive unit 13 presses the upper surface of the leg portion 41c, and the front end portion of the swing lever 40 is displaced downward.

  On the lower surface of the lever base 41, a switch driving portion 41e protruding downward is formed between the concave portion 41a and the leg portion 41d. The switch drive unit 41 e faces the switch 61 assembled on the printed circuit board 60 through the through window 24 a provided on the inclined plate 24. The printed circuit board 60 is assembled to the lower surface of the inclined plate 24 substantially in parallel with the same plate 24, and the switch 61 is provided for each key 10 and arranged in the lateral direction of the keyboard.

  The mass body 42 is formed in a rod shape, and is integrally assembled to the lever base 41 by outsert-molding the lever base 41 on the front outer periphery thereof. The rear part of the mass body 42 is folded and overlapped, and the weight of the mass body 42 is varied by changing the lengths of the bent portions 42a. Specifically, between the adjacent white key 10 and black key 10, the rotational moments above the pressed positions of the keys 10, 10 are set to be substantially equal. Further, in both the white key 10 and the black key 10, the mass body 42 that is heavier than the bass key is used, and the mass body 42 is set lighter toward the high-pitched sound side so that the rotational moment is low. It becomes smaller as it goes to the higher sound side.

  Further, a lower limit stopper member 70 extends in the lateral direction of the keyboard and is fixed to the upper surface of the support base 30 located at the rear end portion of the key frame 20. The lower limit stopper member 70 restricts the upward displacement of the front end portion of the key 10 when the key 10 is released by restricting the downward displacement of the rear end portion of the swing lever 40. In addition, on the lower surface of the upper surface plate 27 located at the rear end portion of the key frame 20, a long upper limit stopper member 80 extends downward in the horizontal direction of the keyboard with a predetermined distance from the lower limit stopper member 70 in the vertical direction. Is fixed. The upper limit stopper member 80 restricts the downward displacement of the key 10 when the key 10 is depressed by restricting the upward displacement of the rear end portion of the swing lever 40.

  Next, the key driving device 100 according to the present invention applied to the keyboard device of the conventional electronic musical instrument configured as described above will be described. The key drive device 100 is assembled to the upper surface of the support base 30 below the vicinity of the center in the front-rear direction of the plurality of keys 10. The support base 30 is formed with a rectangular through-hole that is long in the arrangement direction of the keys 10, that is, in the lateral direction so as to allow the bobbin 111 and the plunger 113 described later to protrude downward.

  As shown in FIGS. 3A and 3B, the key driving device 100 is bent in a U-shaped cross-section so that the upper surface is opened, and is formed to have flange portions at both front and rear ends. The lower case 101 and the upper case 102 on a flat plate are provided, and the upper case 102 is fixed on the flange portion of the lower case 101 with screws 103 in a state where the upper case 102 is placed on the lower case 101. The lower case 101 and the upper case 102 are made of a magnetic material and also serve as a yoke. The lateral length of the key driving device 100, that is, the lateral lengths of the lower case 101 and the upper case 102 may extend over the entire area of a plurality of keys arranged in a single row, or a plurality of all key areas may be divided. May be a length divided into a key range (for example, a length corresponding to one or two octaves). In the latter case, a plurality of key driving devices 100 are arranged in the horizontal direction along the plurality of keys 10.

  The lower case 101 and the upper case 102 are provided with a plurality of through holes 101a and 102a equal to the number of keys 10 at the same position in the front-rear direction and the left-right direction. These through holes 101a and 102a are arranged in a staggered manner in two rows in the horizontal direction. That is, among the plurality of through-holes 101a and 102a, every other half of the through-holes 101a and 102a in the lateral direction (more specifically, half if the through-holes 101a and 102a are even, and more than half if they are odd. One or more through holes 101a, 102a) are located on a first straight line L1 located on the front side extending in the lateral direction. The remaining half of the through-holes 101a and 102a are located on a second straight line L2 located on the rear side and extending in parallel with the first straight line. The distance between the centers of the adjacent through holes 101a, 102a on the first and second straight lines L1, L2 is set to about twice the width of one key 10, and the center position of each through hole 101a, 102a is the lever base. 41 is directly below the rear end portion (position where the mass body 42 is attached).

  The electromagnetic actuator 110 is assembled in each of the through holes 101a and 102a. The electromagnetic actuator 110 includes a bobbin 111, a solenoid 112, a plunger 113, and a drive member 114. The bobbin 111 is integrally formed of a nonmagnetic and nonconductive material (for example, synthetic resin) and includes a main body portion 111a and flange portions 111b and 111c. The main body 111a is formed in a cylindrical shape. The flange portion 111b protrudes in a circular shape on the outer periphery of the main body portion 111a at a position slightly lower than the upper end surface of the main body portion 111a. The flange portion 111c protrudes in a circular shape on the outer periphery of the main body portion 111a at a position slightly lower than the axial center position of the main body portion 111a. The solenoid 112 is constituted by a conductive wire wound on the outer periphery of the main body 111a at a position between the flanges 111b and 111c of the bobbin 111.

  The plunger 113 is made of a magnetic material such as iron, and has a columnar main body 113 a that is slidably incorporated on the inner peripheral surface of the bobbin 111. From the upper end surface of the main body 113a, a cylindrical protrusion 113b is integrally formed and protrudes upward. The protrusion 113b is provided eccentric to the circular upper surface of the main body 113a. Specifically, the central axis of the circular cross section of all the protrusions 113b is at the center position in the left-right direction of the upper surface of the main body 113a, that is, the front-rear direction passing through the center of the upper surface of the main body 113a. Intersects with the straight line. However, with respect to the plunger 113 provided along the first straight line L1, the center of the projection 113b is located at a distance ΔL on the second straight line L2 side with respect to the center of the main body 113a. Regarding the plunger 113 provided along the second straight line L2, the center of the projection 113b is shifted from the center of the main body 113a by the distance ΔL on the first straight line L1 side.

  The drive member 114 is integrally formed of synthetic resin so that a cylindrical protrusion protrudes upward from a disk-shaped bottom, and is fixed to the upper end of the protrusion 113b of the plunger 113. The central axis of the cylindrical protrusion of the drive member 114 is the same as the central axis of the protrusion 113b of the plunger 113. The protrusion 113b and the drive member 114 are configured integrally with the plunger 113 and constitute a drive unit that drives the key 10 by displacement of the plunger 113.

  In the lock driving device 100 configured as described above, first, with the solenoid 112 assembled to the bobbin 111, the lower portions of the main body portions 111a of the plurality of bobbins 111 are respectively inserted into the plurality of through holes 101a of the lower case 101, and the bobbin 111 is locked to the lower case 101 by the flange portion 111c. Thereafter, the upper case 102 is locked onto the flange portion 111b of the bobbin 111 while the upper portions of the main body portions 111a of the plurality of bobbins 111 are inserted into the plurality of through holes 102a of the upper case 102, and the upper case 102 is fixed to the lower case. The upper case 102 is fixed to the lower case 101 with a screw 103. Then, the main body 113a of the plurality of plungers 113 is inserted from the upper end surface of the main body 111a of the bobbin 111 with the drive member 114 assembled to the protrusion 113b of the plunger 113. As a result, the plunger 113 and the drive member 114 are assembled in the main body 111a of the bobbin 111 so as to be able to advance and retract. The key driving device 100 configured as described above is fixed on the support base 30.

  In this state, there is a possibility that the main body 113a of the plunger 113 may rotate about the axis on the inner peripheral surface of the main body 111a of the bobbin 111, so that the bobbin 111 and the plunger 113 and the drive member 114 are It may be necessary to provide a detent means. In this case, for example, a groove extending in the vertical direction is provided on one surface of the inner peripheral surface of the main body portion 111a of the bobbin 111 and the outer peripheral surface of the main body portion 113a of the plunger 113, and on the other surface. A convex part slidably accommodated in the groove can be provided. Further, a pin may be erected upward on the upper surface of the main body portion 111a of the bobbin 111, and a through hole through which the pin is slidable in the vertical direction may be provided in the drive member 114.

  The positional relationship between the plurality of electromagnetic actuators 110 and the plurality of keys 10 of the key driving device 100 configured as described above is shown in the schematic plan view of FIG. 4A. FIG. 4B is an enlarged plan view of the two electromagnetic actuators 110 in FIG. 4A. According to this, the center position of the plurality of electromagnetic actuators 110 (that is, the main body portion 113a of the plunger 113) in plan view is located corresponding to the lateral position of the plurality of keys 10, respectively. Regarding the plurality of plungers 113 provided along the first straight line L1, the center of the circular cross section of the main body 113a is located on the first straight line L1, but the circular cross section of the protrusion 113b and the drive member 114 is provided. Is centered on the second straight line L2 side by a distance ΔL with respect to the first straight line L1. Regarding the plurality of plungers 113 provided along the second straight line L2, the center of the circular cross section of the main body portion 113a is located on the second straight line L2, but the circular cross section of the protrusion 113b and the drive member 114. Is centered on the first straight line L1 side by a distance ΔL with respect to the second straight line L1. As a result, even if the lateral length restriction due to the key width is avoided and the outer diameter of the solenoid 112 is increased to some extent, the protrusion 113b (driving member) of the electromagnetic actuator 110 provided along the first straight line L1 side. 114) and the distance in the front-rear direction between the projection 113b (drive member 114) of the electromagnetic actuator 110 provided along the second straight line L2 side can be shortened.

  Next, the operation of the keyboard device configured as described above will be described. When the key 10 is not depressed, the rear end portion of the mass body 42 of the swing lever 40 is in contact with the lower limit stopper member 70 by its own weight, and the swing lever 40 and the key 10 are in the state shown in FIG. 2A. It is in. When the key 10 is pressed in this state, the key 10 starts to swing counterclockwise in FIG. 2A with the rear end 11 as a fulcrum against the weight of the mass body 42 of the swing lever 40. When the key 10 is depressed to a predetermined depth, the rear end portion of the mass body 42 comes into contact with the upper limit stopper member 80 and the downward displacement of the front end portion of the key 10 is restricted (see FIG. 2B). . When the key 10 is released, the swing lever 40 swings clockwise with the rotation support portion 25 as a fulcrum by the weight of the mass body 42 until the rear end of the mass body 42 contacts the lower limit stopper member 70. Then, it returns to the origin position (see FIG. 2A). The switch 61 provided on the printed circuit board 60 is turned on and off by the switch driving unit 41e by such a key pressing / releasing key operation. In response to the on / off operation, an electronic circuit unit (not shown) of the electronic musical instrument starts generating the musical tone signal and ends the generation of the musical tone signal, so that music can be played by performing the key 10 by the performer.

  On the other hand, in the case of automatic performance, an automatic performance device (not shown) reads performance data stored in advance as time passes, and drives and controls a plurality of electromagnetic actuators 110 according to the performance data. Specifically, if the performance data is key-on data that controls the start of musical tone generation, the solenoid 112 of the electromagnetic actuator 110 corresponding to the key code in the key-on data is energized. By this energization, as shown in FIG. 2B, the plunger 113 of the corresponding electromagnetic actuator 110 is pulled up by electromagnetic force, and the driving member 114 is a lower surface of the lever base 41 and is a concave portion that is a rotation fulcrum of the swing lever 40. The rear position of 41a is raised upward. As a result, the key 10 and the swing lever 40 rotate in the same manner as when the key is pressed, and the switch 61 is turned on. If the performance data is key-off data for controlling the end of musical tone generation, the energization of the solenoid 112 of the electromagnetic actuator 110 corresponding to the key code in the key-off data is released. As a result, as shown in FIG. 2A, the pulled-up plunger 113 is lowered, and the pushing-up of the swing lever 40 by the drive member 114 is released. As a result, the key 10 and the swing lever 40 are rotated in the same manner as when the key is released, and the switch 61 is turned off. Since the generation and stop of the musical tone are controlled by the on / off control of the switch 61 based on the energization / non-energization control of the solenoid 112, an automatic performance using the key driving device 100 is realized.

  In the key drive device that operates in this way, as described above, the protrusion 113b (drive member 114) of the electromagnetic actuator 110 provided along the first straight line L1 side and the second straight line L2 side. Since the distance in the front-rear direction from the projection 113b (drive member 114) of the provided electromagnetic actuator 110 is short, the difference in driving force required to drive the key 10 and the key 10 are driven in the two adjacent keys 10. Therefore, the difference in the stroke of the plunger 113 can be reduced. As a result, high-precision and good key driving can be performed.

  Furthermore, in carrying out the present invention, the present invention is not limited to the above embodiment, and various modifications can be made without departing from the object of the present invention.

  For example, in the above-described embodiment, the bobbin 111 (the main body 111a and the flanges 111b and 111c), the solenoid 112, and the main body 113a of the plunger 113 are configured in a circular cross section. However, instead of this, as shown in FIGS. 5A and 5B, the bobbin 111 (the body portion 111a and the flange portions 111b and 111c), the solenoid 112, and the plunger in the same manner as the schematic views of FIGS. 4A and 4B described above. The cross-sectional shape of the main body 113a of 113 may be an ellipse. Other configurations are the same as those in the above embodiment.

  In this case, with respect to the plurality of electromagnetic actuators 110 provided along the first straight line L1, the center position in the front-rear direction of the main body 113a of the bobbin 111, the solenoid 112, and the plunger 113 is on the first straight line L1. The projection 113b and the center position in the front-rear direction of the drive member 114 are located at a distance ΔL on the second straight line L2 side with respect to the first straight line L1. Regarding the plurality of electromagnetic actuators 110 provided along the second straight line L2, the center position in the front-rear direction of the main body 113a of the bobbin 111, the solenoid 112, and the plunger 113 is on the second straight line L2, and the protrusions The central positions of 113b and the drive member 114 in the front-rear direction are shifted from the second straight line L2 by the distance ΔL on the first straight line L1 side.

  Also by this, the electromagnetic actuator 110 operates in the same manner as described above, and the protrusions 113b and the drive members 114 of the plungers 113 of the plurality of electromagnetic actuators 110 provided along the first straight line L1 and the second straight line L2. Since the distance between the protrusion 113b of the plunger 113 and the drive member 114 of the plurality of electromagnetic actuators 110 provided can be reduced, the same effect as in the above embodiment is expected. Further, in this case, if the area of the cross section of the main body 113a of the plunger 113 is the same as that of the circular shape of the above embodiment, the horizontal width of the main body 111a of the bobbin 111 and the main body 113a of the plunger 113 is the above embodiment. It becomes narrower than the case of. On the other hand, the horizontal width of the bobbin 111 and the solenoid 112 can be the same width as in the above-described embodiment defined by the width of the key 10, so that the cross-sectional area occupied by the coils constituting the solenoid 112 is wide. The total lateral width occupied by the coil can be increased. As a result, according to this modification, the length of the coil wire becomes long, but the number of turns of the coil constituting the solenoid 112 is increased to obtain a large magnetic force, a thick copper wire can be used as the coil, heat dissipation This may be advantageous. Such an advantage is due to the fact that in the lock driving device 100, the lateral width of the solenoid 112 is regulated by the width of the key 10, but the length of the solenoid 112 in the front-rear direction is not substantially regulated.

  Further, as shown in FIGS. 6A and 6B, the bobbin 111 (main body portion 111a and flange portions 111b and 111c), solenoid 112 and main body portion 113a of the plunger 113 in the same manner as the schematic views of FIGS. 4A and 4B described above. The cross sectional shape may be triangular. In this modification, in the electromagnetic actuators 110 having a triangular cross section provided in two rows along the first and second straight lines L1 and L2, the apex of the electromagnetic actuators 110 in one row is the other. It arrange | positions so that it may enter between the vertexes of the two adjacent electromagnetic actuators 110 of this row. However, this triangular corner is rounded to wind the coil around the bobbin 111. Other configurations are the same as those in the above embodiment.

  Also in this case, with respect to the plurality of electromagnetic actuators 110 provided along the first straight line L1, the center position in the front-rear direction of the main body 113a of the bobbin 111, the solenoid 112, and the plunger 113 is the first straight line L1. The center position of the protrusion 113b and the driving member 114 in the front-rear direction is located on the second straight line L2 side by a distance ΔL with respect to the first straight line L1. Regarding the plurality of electromagnetic actuators 110 provided along the second straight line L2, the center position in the front-rear direction of the main body 113a of the bobbin 111, the solenoid 112, and the plunger 113 is on the second straight line L2, and the protrusions The central positions of 113b and the drive member 114 in the front-rear direction are shifted from the second straight line L2 by the distance ΔL on the first straight line L1 side.

  Also by this, the electromagnetic actuator 110 operates in the same manner as described above, and the protrusions 113b and the drive members 114 of the plungers 113 of the plurality of electromagnetic actuators 110 provided along the first straight line L1 and the second straight line L2. Since the distance between the protrusion 113b of the plunger 113 and the drive member 114 of the plurality of electromagnetic actuators 110 provided can be reduced, the same effect as in the above embodiment is expected. Further, in this case, as described above, the vertices of the electromagnetic actuators 110 arranged in two rows in the lateral direction are arranged so as to enter between the vertices of two adjacent electromagnetic actuators 110 in the other row. Therefore, the distance between each projection 113b and the driving member 114 in the two rows of electromagnetic actuators 110 can be further reduced.

  In addition, the cross-sectional shape of the electromagnetic actuator 110 of the above modification can be a shape other than an ellipse and a triangle. For example, the cross-sectional shape of the bobbin 111 (the main body portion 111a and the flange portions 111b and 111c) and the main body portion 113a of the plunger 113 according to the modification may be elliptical as shown in FIG. 7A. Further, in the case of the oval shape of FIG. 5A and the case of the oval shape of FIG. 7A, as shown in FIGS. 7B and 7C, the bobbin for the electromagnetic actuator 110 arranged along the first straight line L1. 111 (the main body portion 111a and the flange portions 111b and 111c) and the electromagnetic actuator 110 in which the cross-sectional shape of the main body portion 113a of the plunger 113 is tapered at the rear side portion and arranged along the second straight line L2, The cross-sectional shape of the bobbin 111 (the main body portion 111a and the flange portions 111b and 111c) and the main body portion 113a of the plunger 113 may be tapered at the front side portion.

  In the triangular shape of FIG. 6A, as shown in FIGS. 7D and 7E, the bobbin 111 (the main body portion 111a and the flange portion 111b) of the electromagnetic actuator 110 arranged along the first straight line L1. , 111c) and the electromagnetic actuator 110 in which the cross-sectional shape of the main body 113a of the plunger 113 is rectangular and circular at the front portion and arranged along the second straight line L2, the bobbins 111 (main body) The cross-sectional shapes of the portion 111a, the flange portions 111b and 111c), and the main body portion 113a of the plunger 113 may be rectangular and circular at the rear portion, respectively. 7A to 7E, the center position of the cross-sectional shape of the protrusion 113b and the drive member 114 is also different from the center position in the front-rear direction such as the bobbin 111 as in the case of FIGS. 5A and 6A. It is off.

  Moreover, in the said embodiment and modification, although the cross-sectional shape of the projection part 113b and the drive member 114 was made circular, it is not restricted to this, The cross-sectional shape of the projection part 113b and the drive member 114 is square or other You may make it a shape.

  Furthermore, in the above-described embodiment and modification, the swing lever 40 is pushed up and driven by the electromagnetic actuator 110. However, when the keyboard structure of the electronic musical instrument is different, other configurations may be employed. In short, when the electromagnetic actuator 110 is energized, the key 10 or a member that moves in conjunction with the key 10 may be driven so as to perform the same function as when the key 10 is depressed. The key driving device 100 is applied not only to a keyboard device of an electronic musical instrument but also to a key driving device 100 that drives a piano key that is a natural musical instrument. In this case, when the key is driven, the string is struck by the movement of the hammer linked to the key, and the instrument sound is generated.

It is a top view of the keyboard apparatus which concerns on one Embodiment of this invention. It is a vertical side view of the keyboard device. It is a vertical side view of the keyboard device showing a state in which one key is driven by the key driving device. It is a top view which shows a part of key drive device. It is the longitudinal cross-sectional view seen along the BB line of FIG. 3A. It is a schematic plan view which shows the positional relationship of several electromagnetic actuators of a key drive device, and several keys. It is a top view which expands and shows two electromagnetic actuators in FIG. 4A. It is a schematic plan view which shows the positional relationship of the some electromagnetic actuator of the key drive device which concerns on a modification, and a some key. It is a top view which expands and shows two electromagnetic actuators in FIG. 5A. It is a schematic plan view which shows the positional relationship of the some electromagnetic actuator of the key drive device which concerns on another modification, and a some key. It is a top view which expands and shows two electromagnetic actuators in FIG. 6A. It is a schematic plan view which shows the positional relationship of the several electromagnetic actuator of the key drive device which concerns on the other modification which further changed the cross-sectional shape of the electromagnetic actuator, and a some key. It is a schematic plan view which shows the positional relationship of the several electromagnetic actuator of the key drive device which concerns on the other modification which further changed the cross-sectional shape of the electromagnetic actuator, and a some key. It is a schematic plan view which shows the positional relationship of the several electromagnetic actuator of the key drive device which concerns on the other modification which further changed the cross-sectional shape of the electromagnetic actuator, and a some key. It is a schematic plan view which shows the positional relationship of the several electromagnetic actuator of the key drive device which concerns on the other modification which further changed the cross-sectional shape of the electromagnetic actuator, and a some key. It is a schematic plan view which shows the positional relationship of the several electromagnetic actuator of the key drive device which concerns on the other modification which further changed the cross-sectional shape of the electromagnetic actuator, and a some key.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Key, 20 ... Key frame, 40 ... Swing lever, 42 ... Mass body, 60 ... Printed circuit board, 61 ... Switch, 100 ... Key drive device, 110 ... Electromagnetic actuator, 111 ... Bobbin, 112 ... Solenoid, 113 ... Plunger, 114 ... drive member

Claims (1)

In a key drive device comprising a plurality of electromagnetic actuators that respectively drive a plurality of keys arranged in a row in the lateral direction, each electromagnetic actuator comprising a solenoid and a plunger,
A plurality of electromagnetic actuators for driving every other plurality of keys in the arrangement direction among the plurality of keys are arranged on a first straight line extending in the lateral direction as the arrangement direction of the plurality of keys. With
A plurality of electromagnetic actuators for driving the remaining plurality of keys, respectively, arranged on a second straight line parallel to the first straight line at a front position or a rear position;
With respect to the electromagnetic actuator in which the drive unit configured integrally with the plunger and driving the key by the displacement of the plunger is arranged on the first straight line with respect to the central position in the front-rear direction of the plunger, the second straight side The key driving device is characterized in that the electromagnetic actuator arranged on the second straight line is shifted to the first straight line side with respect to the electromagnetic actuator arranged on the second straight line.

Images