JP2019056743A - Keyboard device - Google Patents

Abstract

To provide a keyboard device that can stably obtain, for a long period, the same key operation as that of the keyboard of a grand piano despite the short length of the keys compared with that of the grand piano, and can be compact in depth dimension.SOLUTION: A keyboard device comprises a plurality of link mechanisms 4 configured to support a plurality of keys 3 respectively from below and operate the keys 3 such that when the front end part of the key 3 is depressed, the amount of downward movement of the rear end part of the key 3 becomes approximately half of the amount of downward movement of the front end part of the key 3. The link mechanism 4 includes a front side link bar 6 that has a base 6a rotationally joined to a front side support part 8 and has a front end part rotationally joined to the front part of the key 3, and a rear side link bar 7 that is formed shorter than the front side link bar 6, has a base 7a rotationally joined to a rear side support part 9, and has a rear end part rotationally joined to the rear part of the key 3.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a keyboard device that is applied to an electronic keyboard musical instrument or the like and realizes a key operation similar to that of an acoustic grand piano using a relatively short key.

  In general, in an acoustic grand piano keyboard device, a key is configured to be relatively long (for example, 50 to 60 cm), and swings with a balance pin provided near the center in the length direction as a fulcrum. ing. When a keyboard device having such a long key is applied to an electronic piano or the like, the depth dimension becomes large. For this reason, conventionally, for example, a keyboard device disclosed in Patent Document 1 is known as a keyboard device having a short key length.

  The keyboard device is arranged in a state of a frame having a predetermined shape, a base end provided at the rear end of the frame, and a front end of the base end extending in the front-rear direction and aligned in the left-right direction. A plurality of keys, and a link portion provided between each key and the base end portion. An electronic board is provided on the frame, and a plurality of key switches are arranged for each key on the electronic board. Each key is placed on the corresponding key switch near the center in the length direction.

  The link portion between the rear end of each key and the front surface of the base end portion is formed of resin integrally with the key and the base end portion. Specifically, the link portion includes two arms that extend in the front-rear direction and are arranged on the left and right sides. Each arm is formed in a plate shape having a predetermined thickness, and the front connecting portion connected to the key and the rear connecting portion connected to the base end portion are thinned by a semicircular recess opening downward. Is formed.

  In the keyboard device configured as described above, when the front end portion of the key is pushed down, the key rotates downward about the connecting portion on the rear side of both arms in the link portion. Further, in this case, the front and rear connecting portions of both arms function as hinges, so that the key has a larger amount of downward movement at a predetermined position of the rear portion than when the key rotates with the rear end portion as a fulcrum, The difference from the downward movement amount of the front end of the key is reduced. As a result, the key supported via the link portion operates so as to rotate around a virtual rotation fulcrum that is assumed to be located behind the link portion, and the key length is the same as that of the grand piano. Even if it is shorter than that, it is possible to obtain a keyboard that approximates the operation of a grand piano key.

JP 2010-286694 A

  However, in the conventional keyboard device described above, each key is supported in a cantilevered state by the link portion, and each arm of the link portion is made of resin. Operation is likely to be unstable. In addition, due to long-term use of the keyboard device, etc., each arm of the link part is likely to be deformed due to secular change, and in particular, the connecting part before and after each arm is formed thin, so that cracks and breakage may occur. There is. In such a case, the desired operation of the key cannot be obtained. As described above, in the keyboard device that supports the rear end of the key by the resin link portion described above, the same operation as that of the key of the grand piano cannot be obtained stably over a long period of time.

  The present invention has been made in order to solve the above-described problems, and the key operation similar to that of a grand piano keyboard is stable over a long period of time while the key length is shorter than that of the grand piano. An object of the present invention is to provide a keyboard device that can be obtained in a compact manner and that can be configured with a compact depth dimension.

  In order to achieve the above object, an invention according to claim 1 includes a base and a plurality of keys arranged above the base, each extending a predetermined length in the front-rear direction and aligned in the left-right direction. On the base so as to support the corresponding key from below, and when the front end of the key is pushed down, the downward movement amount of the rear end of the key is below the front end of the key. A plurality of link mechanisms configured to operate the key so as to be approximately ½ of the amount of movement to the base, and the link mechanisms are provided on the base at predetermined intervals in the front-rear direction. The front support portion and the rear support portion, and the front support portion extends a predetermined length from the front support portion toward a predetermined position of the front portion of the corresponding key, and the base portion is rotatably connected to the front support portion. The front end is pivotally connected to a predetermined position on the front of the key. A cubbar is configured to be shorter than the front link bar, extends a predetermined length rearward from the rear support portion toward a predetermined position of the rear portion of the corresponding key, and the base portion is rotatably connected to the rear support portion. In addition, the rear end portion has a rear link bar rotatably connected to a predetermined position on the rear portion of the key.

  According to this configuration, the plurality of keys each extending a predetermined length in the front-rear direction are arranged in the left-right direction above the base. In addition, a plurality of link mechanisms for supporting the corresponding keys from below are provided on the base. Thus, unlike the conventional keyboard device in which the rear end of the key is supported in a cantilevered state, the key at the time of key depression can be stably supported and stable operation of the key can be ensured. In the above link mechanism, when the front end portion of the corresponding key is pushed down, the downward movement amount of the rear end portion of the key is about ½ of the downward movement amount of the front end portion. It is configured to be.

  As described above, a key of a general grand piano keyboard device is configured to be relatively long (for example, 50 to 60 cm), and swings around a balance pin provided near the center in the length direction. It is like that. In the keyboard device, the portion exposed to the outside and visible from the player side is about half of the front portion of the key balance pin. For this reason, in the keyboard apparatus of the grand piano, for example, when the key is pressed, when the front end of the key is pushed down by about 10 mm, the rear end of the exposed part of the key is about 5 mm. Move down. That is, the downward movement amount at the rear end portion of the exposed portion of the key when the key is depressed is about ½ of that at the front end portion of the key.

  Therefore, even if each key of the present invention is configured to be relatively short with a length approximately equal to the portion exposed to the outside of the key of the grand piano, the rear end of the key at the time of pressing the key by the corresponding link mechanism Since the amount of movement of the part downward is about ½ of the amount of downward movement of the front end of the key, a key operation similar to that of a grand piano key can be realized when the key is pressed.

  The link mechanism that supports each key has the front link bar and the rear link bar configured as described above. Specifically, the base portions of both link bars are rotatably connected to a front support portion and a rear support portion on the base, respectively. Further, the front link bar extends forward from the front support portion toward a predetermined position of the front portion of the corresponding key, and the front end portion is rotatably connected to the front portion of the key. On the other hand, the rear link bar is configured to be shorter than the front link bar, extends rearward from the rear support portion toward a predetermined position of the rear portion of the corresponding key, and the rear end portion is rotatably connected to the rear portion of the key. Has been. By supporting the front and rear parts of the key from below by the front link bar and the rear link bar of the link mechanism configured in this way, when the front end part of the key is pushed down during key depression, the key link is interlocked with it. Thus, the rear end of the key moves downward while maintaining a fixed relationship with the front end of the key.

  As described above, according to the present invention, the key operation similar to that of a grand piano keyboard can be stably obtained over a long period of time while configuring the key length shorter than that of the grand piano, By configuring the key length to be short, the depth of the keyboard device and the keyboard instrument to which the keyboard device is applied can be made compact.

  According to a second aspect of the present invention, in the keyboard device according to the first aspect, the front link bar has a long hole extending a predetermined length at a front end portion thereof, and the key can be freely rotated through the long hole. The rear link bar has a long hole extending a predetermined length at the rear end thereof, and is pivotally and slidably connected to the key through the long hole. It is characterized by.

  According to this configuration, the front link bar is rotatably and slidably connected to the key through the predetermined long hole provided in the front end portion, while the rear link bar is connected to the rear end. The key is pivotably and slidably connected to the key through a predetermined slot provided in the portion. As a result, compared to the case where the front link bar and the rear link bar are only pivotally connected to the key, the degree of freedom of key operation can be increased, and the same key operation as that of a grand piano key can be performed. Can be easily obtained.

  According to a third aspect of the present invention, in the keyboard device according to the first or second aspect, at least one base of the front side link bar and the rear side link bar is configured to return the depressed key to a key release state. A return spring for rotating the front link bar and the rear link bar in a predetermined direction is provided.

  According to this configuration, since the return spring is provided on at least one base portion of the front link bar and the rear link bar, the front link bar and the rear link bar rotate in a predetermined direction by the urging force of the return spring. Thus, the depressed key can be moved upward and easily returned to the key release state.

  According to a fourth aspect of the present invention, in the keyboard device according to the third aspect, at least one base portion of the front side link bar and the rear side link bar rotates when the depressed key returns to the key release state. The front link bar and the rear link bar when the key is returned to the key release state are provided with a stopper for preventing further rotation.

  According to this configuration, the depressed key moves upward as the front link bar and the rear link bar rotate, and returns to the key release state. In this case, the stopper provided at the base part of at least one of the front side link bar and the rear side link bar prevents further rotation of the front side link bar and the rear side link bar. Thereby, the upward movement of the key is prevented, and the key can be stably returned to the released state.

  According to a fifth aspect of the present invention, in the keyboard device according to any one of the first to fourth aspects, the front link bar is provided with a front connecting portion extending a predetermined length rearward from the base portion, and the rear link bar has a The link mechanism has a predetermined length extending in the front-rear direction, and the front end portion and the rear end portion are respectively connected to the front link portion and the rear side of the front link bar. The link bar has a connection link bar that is rotatably and slidably connected to the rear connection part of the link bar, and a guide part that is provided on the base and guides the connection link bar so as to be movable in the vertical direction. It is characterized by that.

  According to this configuration, the front link bar is provided with a front connection portion extending a predetermined length backward from the base portion, while the rear link bar is provided with a rear connection portion extending a predetermined length forward from the base portion. ing. Further, the link mechanism has a connecting link bar extending a predetermined length in the front-rear direction, and a front end portion and a rear end portion of the connecting link bar are respectively located behind the front connecting portion and the rear link bar of the front link bar. It is connected to the side connecting portion so as to be rotatable and slidable. Further, the connecting link bar is guided by a guide portion provided on the base so as to be movable in the vertical direction. As described above, when the front link bar and the rear link bar are connected via the connection link bar, the operations of the front link bar and the rear link bar are linked to each other, so that both link bars can be connected smoothly and smoothly at the base. It can be rotated stably. As a result, a more stable key operation can be obtained when the key is pressed.

It is a figure for demonstrating the keyboard apparatus by one Embodiment of this invention, (a) is a side view of the keyboard apparatus in a key release state, (b) is a side view which decomposes | disassembles and shows a key and a link mechanism. It is a side view which shows operation | movement of the key of a keyboard apparatus, (a) is a key release state, (b) has shown the key pressing state. It is a figure for demonstrating the keyboard apparatus provided with the link mechanism with which the front side link bar and the back side link bar were connected, (a) is a side view of the keyboard apparatus in a key release state, (b) is a key and a link mechanism It is a side view which decomposes | disassembles and shows. It is a side view which shows operation | movement of the key of the keyboard apparatus of FIG. 3, (a) is a key release state, (b) has shown the key depression state.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. 1A and 1B are side views of a keyboard device according to an embodiment of the present invention, in which FIG. 1A shows a key release state and FIG. 1B shows a state in which a key and a link mechanism are disassembled. This keyboard device 1A is applied to an electronic keyboard instrument such as an electronic piano.

  The keyboard device 1A includes a horizontally disposed plate-like base 2 and an upper portion of the base 2 extending in the front-rear direction (left-right direction in FIG. 1A), and in the left-right direction (FIG. 1A). A plurality of keys 3 (only one white key is shown in FIG. 1) arranged in a state of being arranged in the depth direction) and a plurality of keys provided on the base 2 so as to support the corresponding keys 3 from below. A set of link mechanisms 4 (only one set is shown in FIG. 1) and a front link bar 6 and a rear link bar 7 (to be described later) of each set of link mechanisms 4, and the key 3 pressed is released. Return springs 5a and 5b (see FIG. 1 (b)) and the like are provided.

  The key 3 is made of a molded product such as a synthetic resin, and has a predetermined length in the front-rear direction. For example, the key 3 has a length (for example, 15 cm) that is about half of the length from the front end of a general grand piano key to the balance pin that becomes a fulcrum when the key swings. ing. The key 3 includes an upper wall 3a, left and right side walls 3b, 3b, and a front wall 3c, and is formed in a hollow shape that opens downward and rearward (leftward in FIG. 1).

  Each set of link mechanisms 4 includes a front link bar 6 having a front end (front end) connected to a predetermined position on the front of the key 3 and a front end (rear end) connected to a predetermined position on the rear of the key 3. The rear link bar 7 and the front support portion 8 and the rear support portion 9 fixed on the base 2 and rotatably supporting the base portions 6a and 7a of the front link bar 6 and the rear link bar 7, respectively. have.

  As shown in FIGS. 1A and 1B, both the front link bar 6 and the rear link bar 7 are formed in a predetermined shape by an elongated metal plate. Specifically, the front link bar 6 extends a predetermined length obliquely forward (to the right in FIG. 1) from the front support portion 8 on which the base portion 6a is supported toward a predetermined position of the front portion of the key 3. . A pin hole 6 b is formed in the base portion 6 a of the front link bar 6, while a long hole 6 c extending a predetermined length along the length direction of the front link bar 6 is formed at the distal end portion of the front link bar 6. Is formed. Further, the base portion 6a of the front side link bar 6 is provided with a stopper 6d that protrudes backward by a predetermined length and prevents the front side link bar 6 from rotating beyond the predetermined angle in the counterclockwise direction of FIG. It has been.

  On the other hand, the rear link bar 7 is configured to be shorter than the front link bar 6 and is obliquely rearward from the rear support portion 9 on which the base portion 7a is supported toward a predetermined position on the rear portion of the key 3 (left side in FIG. 1). )) For a predetermined length. In addition, a pin hole 7 b is formed in the base portion 7 a of the rear link bar 7, while a length extending a predetermined length along the length direction of the rear link bar 7 is provided at the distal end portion of the rear link bar 7. A hole 7c is formed. Further, the base 7a of the rear link bar 7 has a stopper 7d that protrudes forward by a predetermined length and prevents the rear link bar 7 from rotating beyond the predetermined angle in the clockwise direction in FIG. Is provided.

  The front support part 8 and the rear support part 9 are arranged at a predetermined interval in the front-rear direction, and the front shape of the upper end part when viewed from the front side is formed in, for example, a U-shape. Each of the link bar 6 and the rear link bar 7 is configured to be supported while being sandwiched from both the left and right sides. Also, pin holes 8a and 9a are formed in the upper ends of the front support portion 8 and the rear support portion 9, respectively. Further, horizontal stoppers 6d and 7d of the front link bar 6 and the rear link bar 7 can be brought into contact with the upper portions of the front support portion 8 and the rear support portion 9 near the pin holes 8a and 9a, respectively, from above. Abutting surfaces 8b and 9b are provided.

  In the link mechanism 4 configured as described above, the front link bar 6 and the rear link bar 7 are coupled to the key 3 as follows. The key 3 has a front key coupling pin 11 extending horizontally between the left and right side walls 3c, 3c fixed at a predetermined position on the front part, while being fixed at a predetermined position on the rear side between the left and right side walls 3c, 3c. A rear key connecting pin 12 extending horizontally is fixed.

  The front link bar 6 is inserted into the front key connection pin 11 of the key 3 through the long hole 6c at the front end portion thereof, and is thereby rotatably and slidably connected to the front portion of the key 3. ing. On the other hand, the front side of the rear link bar 7 is inserted into the rear key connecting pin 12 of the key 3 through the long hole 7 c, so that the rear link bar 7 can rotate and slide with respect to the rear part of the key 3. It is connected to.

  Moreover, the front side link bar 6 and the rear side link bar 7 are respectively connected with the front side support part 8 and the rear side support part 9 as follows. That is, the front link bar 6 is inserted into the front support pin 13 whose base portion 6a is fixed to the pin hole 8a of the front support portion 8 through the pin hole 6b. It is connected freely. On the other hand, the rear link bar 7 is inserted into the rear support pin 14 whose base portion 7a is fixed to the pin hole 9a of the rear support portion 9 via the pin hole 7b. On the other hand, it is connected rotatably.

  Further, the above-described front return spring 5a and rear return spring 5b are provided on the base portions 6a and 7a of the front link bar 6 and the rear link bar 7, respectively. Specifically, both the front return spring 5a and the rear return spring 5b are configured by torsion springs. Further, the front side return spring 5a is inserted with the front side support pin 13, and in FIG. 1, the front side link bar 6 is rotated in the counterclockwise direction about the front side support pin 13, and the front side return spring 5a The base 6a of the link bar 6 and the upper end of the front support 8 are locked. On the other hand, in the rear return spring 5b, the rear support pin 14 is inserted, and in FIG. 1, a state in which the urging force that rotates the rear link bar 7 clockwise around the rear support pin 14 is exhibited. Thus, the rear link bar 7 is locked to the base portion 7 a and the upper end portion of the rear support portion 9.

  In the electronic keyboard instrument to which the keyboard device 1A configured as described above is applied, the link mechanism 4 below the key 3 is covered with an exterior case (not shown) so that it cannot be seen from the outside. . Further, on the rear side of the key 3, a front panel P is provided that stands from the vicinity of the rear end of the upper surface of the key 3 and constitutes a part of the exterior case. Therefore, in this keyboard device 1A, almost the entire key 3 is exposed to the outside.

  Next, with reference to FIG. 2, the operation of the key 3 of the keyboard device 1A at the time of key depression will be described. FIGS. 9A and 9B show a key release state when the front end portion of the key 3 is not pressed down and a key press state when the key 3 is pressed down.

  As shown by the white arrow in FIG. 2A, when the front end of the key 3 is pushed down by a player or the like with a finger, the front link bar 6 is moved to the front side against the urging force of the front return spring 5a. While rotating around the support pin 13 in the clockwise direction, the rear link bar 7 rotates counterclockwise around the rear support pin 14 against the urging force of the rear return spring 5b. At the same time, the front end of the front link bar 6 slides with respect to the front key connection pin 11 of the key 3, and the front end of the rear link bar 7 moves to the rear key connection pin 12 of the key 3. Slide against. As shown in FIG. 2B, when the front end portion of the key 3 is pushed down to the lowest position, the front end portion has a distance F ( For example, the rear end portion is positioned downward by a distance R (for example, 5 mm) that is approximately ½ of the distance F.

  When the finger is released from the depressed key 3, the front link bar 6 and the rear link bar 7 are rotated counterclockwise and clockwise by the biasing force of the front return spring 5a and the rear return spring 5b, respectively. To do. In this case, the front link bar 6 is prevented from further rotating by the stopper 6d coming into contact with the upper contact surface 8b of the front support portion 8 from above. Similarly, the rear link bar 7 is prevented from rotating further by the stopper 7d coming into contact with the contact surface 9b on the upper portion of the rear support portion 9 from above. Thus, the key 3 moves upward and returns to the original key release state.

  As described above, according to the present embodiment, the key 3 is stably supported from below by the link mechanism 4 at the front and rear portions thereof, so that the rear end of the key is cantilevered. Unlike the supported conventional keyboard device, stable operation of the key 3 can be ensured. Further, the link mechanism 4 is configured such that when the front end portion of the key 3 is pushed down, the downward movement amount of the rear end portion is about ½ of the downward movement amount of the front end portion. Has been.

  Therefore, even if the key 3 has a length comparable to that of the portion exposed to the outside of the key of the grand piano and is configured to be relatively short, the corresponding link mechanism 4 causes the rear end portion of the key 3 to be depressed. Is about ½ of that of the front end portion of the key 3, so that the key operation similar to that of a grand piano key can be realized when the key is pressed. As described above, in the present embodiment, the key operation similar to that of the grand piano keyboard can be stably obtained over a long period of time while the length of the key 3 is configured to be shorter than that of the grand piano. The length of the keyboard device 1A and the depth of the keyboard instrument to which the keyboard device 1A is applied can be made compact.

  Next, with reference to FIG. 3 and FIG. 4, the keyboard device 1 </ b> B provided with the link mechanism 4 in which the front link bar 6 and the rear link bar 7 are connected by the connecting mechanism 21 in the above-described keyboard device 1 </ b> A will be described. In this keyboard device 1B, since the parts other than the connection mechanism 21 are the same as those of the keyboard device 1A, the following description will focus on the connection mechanism 21.

  As shown in FIG. 3, the connecting mechanism 21 extends a predetermined length in the front-rear direction, and connects the front link bar 6 and the rear link bar 7, and the connection link bar 22 is movable up and down. It is comprised by the guide part 23 etc. which guide to.

  The connecting link bar 22 is formed in a predetermined shape by an elongated metal plate, and long holes 22a and 22b extending a predetermined length along the length direction of the connecting link bar 22 are respectively formed at the front end portion and the rear end portion thereof. Is formed. Further, a guide convex portion 22 c that protrudes to the left (front side in FIG. 3) and engages with the guide portion 23 is provided at the center portion of the connecting link bar 22 in the length direction.

  On the other hand, the guide part 23 is fixed between the front support part 8 and the rear support part 9 on the base 2, and has a guide groove 23a in the upper part. The guide groove 23a is formed so as to open upward, penetrate in the left-right direction (front and back direction in FIG. 3), and extend a predetermined length in the up-down direction. The guide convex portion 22c of the connecting link bar 22 is slidably engaged with the guide groove 23a, so that the connecting link bar 22 is movable only in the vertical direction.

  In the connection mechanism 21 configured as described above, the front end portion of the connection link bar 22 is provided at the rear end portion of the stopper 6d (front side connection portion) of the front side link bar 6 through the long hole 22a. 6e is inserted. The rear end portion of the connection link bar 22 is inserted through a long hole 22b into a connection pin 7e provided at the front end portion of the stopper 7d (rear side connection portion) of the rear side link bar 7. Accordingly, the front end portion and the rear end portion of the connection link bar 22 are rotatably and slidably connected to the stopper 6d of the front link bar 6 and the stopper 7d of the rear link bar 7, respectively.

  FIG. 4 shows the operation of the key 3 of the keyboard device 1B when the key is depressed, as in FIG. 4A, when the front end portion of the key 3 is pushed down, the front link bar 6 resists the urging force of the front return spring 5a, and the clock is moved around the front support pin 13. While rotating in the direction, the connecting link bar 22 moves upward while being guided by the guide portion 23. Accordingly, the rear link bar 7 is interlocked with the rotation of the front link bar 6 via the connecting link bar 22 and resists the urging force of the rear return spring 5b, thereby supporting the rear support pin. It rotates counterclockwise around 14. Then, as shown in FIG. 4B, when the front end of the key 3 is pushed down to the lowest position, the front end and the rear end of the key 3 are compared to the key release state as in the keyboard device 1A. Are located below by distances F and R, respectively.

  Further, when the depression of the key 3 is released, the front link bar 6 and the rear link bar 7 are rotated in the opposite directions by the urging force of the front return spring 5a and the rear return spring 5b, respectively. The connecting link bar 22 moves downward while being guided by the guide portion 23. Similarly to the keyboard device 1A, the stopper 6d of the front link bar 6 contacts the contact surface 8b of the front support portion 8, and the stopper 7d of the rear link bar 7 contacts the contact surface 9b of the rear support portion 9. Thus, the front link bar 6 and the rear link bar 7 are prevented from rotating. Thus, the key 3 moves upward and returns to the original key release state.

  As described above, this keyboard device 1B can also obtain the same effects as the keyboard device 1A described above. In the keyboard device 1B, the front link bar 6 and the rear link bar 7 are connected via the connection link bar 22, so that the operations of the front link bar 6 and the rear link bar 7 are linked to each other. The bars 6 and 7 can be rotated smoothly and stably at the bases 6a and 7a. As a result, a more stable operation of the key 3 can be obtained when the key is depressed.

  In addition, this invention can be implemented in various aspects, without being limited to the described embodiment. For example, the keyboard devices 1A and 1B are provided with a front link bar 6 and a rear link bar 7 that support the key 3 and are arranged so that the distance in the front-rear direction gradually increases toward the upper key 3. Although the link mechanism 4 has been illustrated, various link mechanisms can be employed as long as the key 3 at the time of key depression can obtain the same key operation as that of a grand piano key.

  Moreover, although the synthetic resin was illustrated as a material of the key 3, the key is not limited to this, and can be composed of other various materials (for example, composite materials). Moreover, although the metal was illustrated as a material of the front side link bar 6, the rear side link bar 7, and the connection link bar 22, a link bar is not limited to this, Other various materials (for example, carbon fiber resin) It is also possible to configure. Furthermore, the extending directions of the long holes 6c and 7c formed in the front link bar 6 and the rear link bar 7 and the long holes 22a and 22b formed in the connection link bar 22 can be appropriately changed. .

  In the embodiment, the front return spring 5a is provided at the base 6a of the front link bar 6 and the rear return spring 5b is provided at the base 7a of the rear link bar 7. However, the present invention is limited to this. Instead, a return spring may be provided only on one of the base portions 6a and 7a. Further, instead of these return springs 5a and 5b, or together with these return springs 5a and 5b, in order to return the depressed key 3 to the key release state, the front end of each key 3 and the base 2 A compression coil spring or the like may be disposed between them. Further, in the embodiment, the stoppers 6d and 7d are provided on the base portions 6a and 7a of the front link bar 6 and the rear link bar 7, respectively, but the present invention is not limited to this, and the base portion 6a and You may make it provide a stopper only in one side of 7a.

  In the embodiment, the case where the keyboard device of the present invention is applied to an electronic keyboard instrument has been described. However, the present invention is not limited to this, and is applied to, for example, a practice keyboard device that does not emit sound. It is also possible. In that case, devices such as a sensor, a switch, and an electronic board for detecting key pressing information are unnecessary. Further, the detailed configurations of the keyboard devices 1A and 1B shown in the embodiment are merely examples, and can be appropriately changed within the scope of the gist of the present invention.

1A Keyboard Device 1B Keyboard Device 2 Base 3 Key 4 Link Mechanism 5a Front Return Spring 5b Rear Return Spring 6 Front Link Bar 6a Front Link Bar Base 6b Front Link Bar Pin Hole 6c Front Link Bar Long Hole 6d Front Link Bar Stopper (front side connecting part)
6e Connecting pin 7 Rear link bar 7a Base part of rear link bar 7b Pin hole of rear link bar 7c Long hole of rear link bar 7d Stopper of rear link bar (rear link part)
7e connecting pin 8 front support portion 8a pin hole 8b contact surface 9 rear support portion 9a pin hole 9b contact surface 11 front key connection pin 12 rear key connection pin 13 front support pin 14 rear support pin 21 connection mechanism 22 Connecting link bar 23 guide part

Claims (5)

Base and
Above the base, a plurality of keys, each extending a predetermined length in the front-rear direction and arranged side by side in the left-right direction,
The corresponding key is provided on the base so as to support the key from below, and when the front end of the key is pushed down, the downward movement amount of the rear end of the key A plurality of link mechanisms configured to operate the key so as to be about ½ of the downward movement amount of the unit;
With
The link mechanism is
A front support part and a rear support part provided on the base at a predetermined interval in the front-rear direction;
A predetermined length extends forward from the front support portion toward a predetermined position of the front portion of the key, a base portion is rotatably connected to the front support portion, and a front end portion of the front portion of the key A front link bar rotatably connected to the predetermined position;
It is configured to be shorter than the front link bar, extends a predetermined length rearward from the rear support portion toward a predetermined position of the rear portion of the corresponding key, and a base portion is rotatably connected to the rear support portion. And a rear link bar whose rear end is rotatably connected to the predetermined position of the rear portion of the key;
A keyboard device characterized by comprising: The front link bar has a long hole extending a predetermined length at a front end thereof, and is rotatably and slidably connected to the key through the long hole.
The rear link bar has a long hole extending a predetermined length at a rear end thereof, and is rotatably and slidably connected to the key through the long hole. The keyboard device according to claim 1.   At least one base of the front link bar and the rear link bar rotates the front link bar and the rear link bar in a predetermined direction in order to return the depressed key to the key release state. A keyboard device according to claim 1 or 2, wherein a return spring is provided.   At least one base portion of the front link bar and the rear link bar rotates when the depressed key returns to the key release state, and the front link when the key returns to the key release state. The keyboard device according to claim 3, wherein a stopper for preventing further rotation of the bar and the rear link bar is provided. The front link bar is provided with a front connecting portion extending a predetermined length rearward from the base,
The rear link bar is provided with a rear connecting portion extending a predetermined length forward from the base,
The link mechanism is
A predetermined length extends in the front-rear direction, and the front end portion and the rear end portion are rotatably and slidably connected to the front connection portion of the front link bar and the rear connection portion of the rear link bar, respectively. Connected link bar,
A guide portion provided on the base and guiding the connecting link bar in a vertically movable manner;
The keyboard device according to claim 1, wherein the keyboard device is provided.

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