JP2013041080A - Keyboard device of electronic musical instrument - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the difference in key touch feeling due to the difference in key push-off operation position in the longitudinal direction of the key, while minimizing a space occupied by a keyboard device in an electronic musical instrument.SOLUTION: A plurality of white keys 11w and a plurality of black keys 11b swinging by key push-off operation are provided. Among the plurality of white keys 11w and the black keys 11b, swing center parts of the white keys 11w and the black keys 11b belonging to a high frequency range sound part H are located closer a player than swing center parts of the white keys 11w and the black keys 11b belonging to a middle frequency range sound part M, lengths of the white keys 11w belonging to the high frequency range sound part H are shorter than those of the white keys 11w belonging to the middle frequency range sound part M, and lengths of the black keys 11b belonging to the high frequency range sound part H are shorter than those of the black keys 11b belonging to the middle frequency range sound part M. Moreover, reaction imparted to front end parts of the keys belonging to the high frequency range sound part H is made to be smaller than reaction imparted to front end parts of the keys belonging to the middle frequency range sound part M.

Description

  The present invention relates to a keyboard device for an electronic musical instrument such as an electronic organ or an electronic piano.

  Conventionally, for example, as shown in Patent Document 1 below, in order to simulate the key touch feeling (reaction force against the key operation) of an acoustic piano, the higher the assigned pitch, 2. Description of the Related Art A keyboard device for an electronic musical instrument having a light key touch at the front end is known. The keyboard device includes a plurality of hammers that respectively engage and swing with the keys and apply reaction forces against key pressing and releasing operations. The length from the fulcrum of the key provided at the rear end to the front end of the key is gradually increased from the bass key to the treble key. Further, the distance from the fulcrum of the key to the engagement position between the hammer and the key is the same for all the keys.

Japanese Patent No. 3074794

  However, in the above conventional keyboard device, the key of the bass part is shorter than the key of the treble part, so the difference in the key touch feeling due to the difference in the pressing and releasing key operation position in the longitudinal direction of the key caused by the lever principle is as follows: The bass key is larger than the treble key. That is, in the key of the bass part, compared with the key touch feeling at the front end part of the key, the key touch feeling behind the key intermediate part is very heavy and difficult to play.

  Note that the reaction force (load) felt when the player presses the key is a static load corresponding to the balance of the force applied to the rocking system composed of a key, a hammer, etc. and the magnitude of the moment of inertia of the rocking system. It is a combination of dynamic load according to the height. The balance of the force applied to the rocking system is the weight of the portion closer to the player than the rocking center of the rocking system and the weight of the portion farther from the player than the rocking center. Balance (ie leverage ratio). The static load is a load that is mainly felt when the key is slowly depressed, and the dynamic load is a load that is mainly felt when the key is strongly depressed. Here, in the keyboard apparatus of an acoustic piano, the static load is almost the same for all keys, and the dynamic load is gradually reduced from the low-side key to the high-side key. Therefore, in an acoustic piano, when the key is depressed slowly, the reaction force is constant regardless of the pitch assigned to the key.

  On the other hand, in the keyboard device of the electronic musical instrument, some of the mechanisms included in the keyboard device of the acoustic piano are omitted in order to reduce the size of the device. For example, a repetition mechanism that enables high-speed continuous keystroke by omitting a jack that transmits the key movement to the hammer quickly returns to the key released position during the hammer movement is omitted. Therefore, in the keyboard device of an electronic musical instrument, the moment of inertia of the hammer cannot be increased so much in order to enable high-speed continuous keystrokes (that is, to quickly return the key to the key release state), so that the dynamic load is too large. Can not. That is, the difference between the dynamic load of the bass key and the dynamic load of the treble key is small. Therefore, the static load of the bass key is set larger than the static load of the treble key. Thereby, the key touch feeling is approximated to the key touch feeling of the keyboard device of the acoustic piano as a whole. That is, the dynamic load characteristic of the keyboard device of the electronic musical instrument is different from the dynamic load characteristic of the keyboard device of the acoustic piano. Therefore, in the keyboard device of an electronic musical instrument, by making the characteristics of the static load slightly different from the characteristics of the static load of the acoustic piano keyboard device, the overall load felt by the player is equivalent to the load of the acoustic piano keyboard device. It is trying to become. However, as described above, in the keyboard device of an electronic musical instrument, the static load of the low-pitched side key is larger than the static load of the high-pitched side key. The higher the assigned pitch, the smaller the reaction force. In addition, in the keyboard device of an electronic musical instrument, the dynamic load of the low-pitched side key is larger than the dynamic load of the high-pitched key, so that when the key is pressed strongly, the pitch assigned to the key is The higher the value, the smaller the reaction force. That is, in the keyboard device of an electronic musical instrument, the reaction force is smaller as the assigned pitch is higher, regardless of the playing style.

  The present invention has been made in order to solve the above-described problems, and its purpose is to reduce the difference in key touch feeling due to the difference in the key pressing / releasing operation position in the longitudinal direction of the key and to occupy the keyboard device in the electronic musical instrument. Is to make the space to be as small as possible. In addition, in the description of each constituent element of the present invention below, in order to facilitate understanding of the present invention, reference numerals of corresponding portions of the embodiment are described in parentheses, but each constituent element of the present invention is The present invention should not be construed as being limited to the configurations of the corresponding portions indicated by the reference numerals of the embodiments.

  In order to achieve the above-mentioned object, the present invention is characterized by the fact that the pitches are assigned to each other, the keys are pressed and released by the performer, and the swing center portions (Kw, Kb) provided at the rear end portion are centered. And a plurality of white keys (11w) and black keys (11b) supported so as to be swingable, and reaction force applying means (16w, 16b) for applying reaction forces to the pressing and releasing key operations to the plurality of white keys and black keys, respectively. In the keyboard device of the electronic musical instrument, the rocking center portion of the white key and the black key belonging to the predetermined first range (H) among the plurality of white keys and black keys is lower than the first range. The white key belonging to the second range is provided at a position closer to the performer than the rocking center of the white key and black key belonging to the second range (M) on the side, and the length of the white key belonging to the first range is set to the white key belonging to the second range And the black key belonging to the first range is shorter than the black key belonging to the second range. Lies in the smaller than the reaction force which imparts a reaction force to be applied to the front end of the belonging white keys and black keys in the front end of the white key and the black keys belonging to the second range. In this case, among a plurality of white keys and black keys, a plurality of keys in at least one of the first range and the second range, and a central axis of a rocking center of the plurality of keys having continuous pitches Should be common. In the present invention, the rear end portion of the key is a portion behind the center in the longitudinal direction of the key. In the present invention, the reaction force applied to the key by the reaction force application means means the static load and the dynamic load.

  According to the keyboard device configured as described above, a key belonging to the second range is longer than a key belonging to the first range. Therefore, in the first sound range, the difference in key touch feeling due to the difference in the key pressing position in the longitudinal direction of the key is relatively large, but in the second sound range, the difference in the key pressing position in the longitudinal direction of the key. There is little difference in the key touch feeling. The reaction force applied to the front end portion of the key by the reaction force applying means is larger in the second sound range than in the first sound range, but as described above, the key being pushed and released in the longitudinal direction of the key belonging to the second sound range. Since the difference in key touch feeling due to the difference in operation position is reduced, it is possible to prevent the key touch feeling when the key is pressed and released at a position slightly on the fulcrum side of the key from being too heavy and difficult to play. . On the other hand, the key touch feeling of the keys belonging to the first sound range greatly varies depending on the longitudinal key pressing position, but in the first sound range, the reaction force applied to the front end portion of the key by the reaction force applying means is reduced. Since it is smaller than the second sound range, there is no problem in performance even if the difference in key touch feeling in the longitudinal direction of the key is somewhat large. Therefore, a space can be provided behind the first sound range. That is, the area occupied by the keyboard device in the electronic musical instrument can be reduced. And other parts (power transformer, speaker, etc.) which comprise an electronic musical instrument can be arranged in the space, and the limited space inside the main body of the electronic musical instrument can be used efficiently.

  In addition, another feature of the present invention is that, among a plurality of white keys and black keys, the rocking center of the white key and the black key belonging to the third sound range (L) located on the lower side of the second sound range is the first key. Provided at a position farther from the performer than the center of rocking of the white and black keys belonging to the two ranges, making the white keys belonging to the third range longer than the white keys belonging to the second range, and in the third range The black key belonging to the second range is made longer than the black key belonging to the second range, and the reaction force applied to the front end of the white key and black key belonging to the third range is applied to the front end of the white key and black key belonging to the second range. This is because it is larger than the reaction force.

  According to the keyboard device configured as described above, since the key belonging to the third sound range that is lower than the second sound range is longer than the key belonging to the second sound range, the key in the longitudinal direction of the key in the third sound range The difference in touch feeling can be made smaller than the difference in key touch feeling in the longitudinal direction of the keys in the second sound range, and the performance can be facilitated. In addition, since a space can be provided behind the second sound range, the limited space inside the main body of the electronic musical instrument can be used more efficiently.

  Another feature of the present invention is that, among the plurality of white keys and black keys, the second and second rocking centers of the white key and black key belonging to the third sound range (L) located on the lower sound side than the second sound range are defined. Provided closer to the player than the center of rocking of the white and black keys belonging to the range, make the white key belonging to the third range shorter than the white key belonging to the second range, and belong to the third range The black key is made shorter than the black key belonging to the second range, and the reaction force applied to the front end of the white key and black key belonging to the third range is applied to the front end of the white key and black key belonging to the second range. This is because it is larger than the reaction force.

  According to the keyboard device configured as described above, since the key belonging to the third sound range that is lower than the second sound range is shorter than the key belonging to the second sound range, the key in the longitudinal direction of the key in the third sound range. The difference in touch feeling is larger than the difference in key touch feeling in the longitudinal direction of the key in the second sound range. In general, since keys belonging to the middle range (ie, the second range) are frequently used, the difference in the key touch in the longitudinal direction of the key in the second range is made smaller than that in the first and third ranges. Although it has characteristics slightly different from the key touch feeling characteristics of an acoustic piano, it is possible to construct a keyboard device that is practically easy to play. Moreover, since a space can be provided behind the first sound range and the third sound range, the limited space inside the main body of the electronic musical instrument can be used more efficiently. In particular, it is advantageous when other parts of the electronic musical instrument are arranged symmetrically.

It is a top view of the keyboard device concerning a 1st embodiment of the present invention. It is a right view which shows the structure regarding the white key of the keyboard apparatus of FIG. It is a right view which shows the structure regarding the black key of the keyboard apparatus of FIG. It is a characteristic curve figure which shows the relationship between a pitch and the mass of a mass body. It is a characteristic curve figure which shows the relationship between a pitch and a key touch. It is a top view of the keyboard apparatus which concerns on 2nd Embodiment of this invention. It is a top view of the keyboard apparatus which concerns on the modification of this invention. It is a top view of the keyboard apparatus which concerns on the other modification of this invention.

(First embodiment)
Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. In the following description, the side closer to the performer is referred to as “front side”, and the side farther from the performer is referred to as “rear side”. Further, the high sound side is referred to as “right side”, and the low sound side is referred to as “left side”.

  As shown in FIG. 1, the keyboard device has a plurality of white keys 11w and a plurality of black keys 11b. The white key 11w and the black key 11b are each integrally molded in a long shape with a synthetic resin. The entire sound range (A0 to C8) of the keyboard device is divided into three sound ranges of a low tone portion L (A0 to B2), a mid tone portion M (C3 to B5), and a high tone portion H (C6 to C8). . That is, the central key 11w (C4) belongs to the middle tone part M. The white key 11w and the black key 11b belonging to the bass part L are longer than the white key 11w and the black key 11b belonging to the middle part M, respectively. Further, the white key 11w and the black key 11b belonging to the treble part H are shorter than the white key 11w and the black key 11b belonging to the middle sound part M, respectively. In each sound range, the white key 11w is longer than the black key 11b. The difference between the white key 11w and the black key 11b due to the difference in the sound range is only the length in the front-rear direction, and the other configurations are the same. Therefore, hereinafter, the configuration of the white key 11w and the black key 11b of the high sound portion H will be described with reference to FIGS. 2 and 3, and the white key 11w and the black key 11b of the middle sound portion M and the low sound portion L will be described. Is omitted. The white key 11w has a smaller vertical width and a larger horizontal width than the black key 11b. Each of the white key 11w and the black key 11b has a thin upper wall extending in the front-rear direction and a thin side wall extending downward from the left and right ends of the upper wall, and is formed in a hollow shape opened downward. ing. Further, opposed through holes Kw and Kb are provided at the rear portions of the side walls of the white key 11w and the black key 11b, respectively. The distance from the through hole Kw and the through hole Kb to the rear end of each key is the same for all keys regardless of the sound range. The white key 11 w and the black key 11 b are supported by the key support portion 13 of the key frame 12.

  The key frame 12 is integrally formed by resin molding. The key frame 12 includes a front plate 12a and a rear plate 12b extending in the front-rear direction and the left-right direction. The key support portion 13 is formed so as to protrude upward from the upper surface of the rear plate 12b. The key support portion 13 of the bass portion L is provided behind the key support portion 13 of the mid tone portion M, and the key support portion 13 of the treble portion H is provided ahead of the key support portion 13 of the mid tone portion M. It has been. That is, the rear end of the key frame 12 is formed in a step shape along the position of the rear end of the key in plan view. The position in the front-rear direction of the key support portion 13 in each range is the same. Each key support portion 13 is formed in the shape of two plates facing each other, and includes a protruding portion 13a facing inward. The protrusion 13a is fitted in the through hole Kw and the through hole Kb. Thus, the white key 11w and the black key 11b are supported so as to be rotatable around the protruding portion 13a, and the front end portions of the white key 11w and the black key 11b can swing in the vertical direction. Upper ends of a plurality of ribs 12d extending in the up-down direction and the front-rear direction are integrally connected to the front plate 12a and the rear plate 12b. The ribs 12d are thin in the left-right direction, and are provided at a predetermined interval in the left-right direction. Further, the rib 12d projects forward from the front end of the front plate 12a. Rail portions 17, 19, and 21 to be described later are provided on the protruding portion.

  In addition, a drive unit 11w1 extends downward from an intermediate portion of the white key 11w. The drive unit 11w1 has a thin front wall that extends vertically and a thin side wall that extends rearward from the left and right ends of the front wall, and is formed in a hollow shape that opens rearward. The lower end of the drive unit 11w1 is closed by the lower end wall. On the other hand, the black key 11b has the same drive unit 11b1 as the white key 11w. The black key 11b extends downward from the front end of a portion protruding below the upper surface of the white key 11w (hereinafter referred to as the visible portion of the black key 11b) in the key release state, and then slightly curves forward. The upper end of the drive part 11b1 is connected to the tip of the connecting part. The front-rear direction positions of the drive unit 11w1 and the drive unit 11b1 are the same, and the vertical positions of the lower end walls of the drive unit 11w1 and the drive unit 11b1 are also the same. That is, the drive part 11w1 and the drive part 11b1 are located ahead of the front end of the visible part of the black key 11b. The lower end portions of the drive portion 11w1 and the drive portion 11b1 are engaged with the front end portions of the hammer 16w and the hammer 16b, respectively, in an opening portion opened in the vertical direction provided in front of the front plate 12a.

  The hammer 16w includes a synthetic resin base 16w1, a metal connecting rod 16w2, and a mass body 16w3. Similarly to the hammer 16w, the hammer 16b includes a base portion 16b1, a connecting rod 16b2, and a mass body 16b3. The base portion 16w1 and the base portion 16b1 are plate-like members, and each include a through hole Hw and a through hole Hb that penetrate from the right side surface to the left side surface. Moreover, the rail part 17 is extended in the left-right direction so that the lower end part of the adjacent rib 12d may be connected. The rail portion 17 is narrower in the front-rear direction than the front plate 12a and the rear plate 12b. A hammer support portion 18w and a hammer support portion 18b are formed on the upper surface of the rail portion 17 so as to protrude upward. The hammer support portion 18w and the hammer support portion 18b are formed in two opposing plate shapes, and are provided with a protruding portion 18w1 and a protruding portion 18b1 that are respectively opposed to the inside. The protrusion 18w1 and the protrusion 18b1 are fitted in the through hole Hw and the through hole Hb, respectively. Accordingly, the base portion 16w1 and the base portion 16b1 are supported so as to be rotatable around the protruding portion 18w1 and the protruding portion 18b1. That is, the hammer 16w and the hammer 16b are supported so that the front end portion and the rear end portion can swing in the vertical direction. The positions in the front-rear direction of the hammer support portion 18w and the hammer support portion 18b are common to all the hammers 16w and the hammers 16b.

  The base portion 16w1 includes a pair of upper and lower leg portions Fw1 and Fw2 at the front end, and the upper leg portion Fw1 is shorter than the lower leg portion Fw2. Similarly to the base portion 16w1, the base portion 16b1 also includes a pair of upper and lower leg portions Fb1 and Fb2 at the front end portion. The lower end wall of the drive unit 11w1 enters between the leg part Fw1 and the leg part Fw2, and the lower end wall of the drive unit 11b1 enters between the leg part Fb1 and the leg part Fb2. The leg part Fw1 and the leg part Fb1 are respectively a lower end wall of the drive part 11w1 and the drive part 11b1, and an intermediate wall that forms a gap between the lower end wall in the drive part 11w1 and the drive part 11b1. Intrusions. Shock absorbers such as rubber, urethane, and felt are fitted and fixed to the lower end walls of the drive unit 11w1 and the drive unit 11b1. This shock absorber includes a collision between the drive unit 11w1 and the upper surface of the leg part Fw2, a collision between the lower end of the drive part 11b1 and the upper surface of the leg part Fb2, a collision between the lower end of the drive part 11w1 and the lower surface of the leg part Fw1, and The impact caused by the collision between the lower end of the drive portion 11b1 and the lower surface of the leg portion Fb1 is alleviated.

  Front end portions of the connecting rod 16w2 and the connecting rod 16b2 are assembled to the rear end portions of the base portion 16w1 and the base portion 16b1, respectively. Each of the connecting rod 16w2 and the connecting rod 16b2 extends backward. The positions of the rear ends of the connecting rod 16w2 and the connecting rod 16b2 are the same. Then, the lengths of the connecting rod 16w2 and the connecting rod 16b2 are adjusted so that the rear ends of the mass body 16w3 and the mass body 16b3 described below are positioned in front of the rear ends of the white key 11w and the black key 11b. Yes.

  As described above, the position of the fulcrum of the key differs depending on the sound range. Therefore, the distance from the swing center of the white key 11w to the contact part Pw1 with the drive part 11w1 in the leg part Fw2 differs depending on the sound range. Further, the distance from the swing center of the black key 11b to the contact portion Pb1 with the drive portion 11b1 in the leg portion Fb2 varies depending on the sound range. Further, in the white key 11w, the pressing / release key operating position W0, which is the front end of the position where the key can be pressed / released, is located in front of the contact portion Pw1, whereas in the black key 11b, The key release position B0, which is the front end of the position where the key can be pressed / released, is located behind the contact portion Pb1. Therefore, if the mass of the mass body 16w3 and the mass body 16b3 is the same for all the keys, the key touch feeling of the middle tone portion M rather than the bass portion L at the press / release key operation positions W0 and B0 according to the lever principle. The key touch feeling of the high pitched part H is heavier than the middle tone part M. In this case, the touch feeling of the white key 11w and the black key 11b in each sound range is not unified. That is, the key touch feeling of the black key 11b is heavier than the key touch feeling of the white key 11w. Therefore, as shown in FIG. 4, the mass of the mass body 16w3 and the mass body 16b3 is adjusted for each key, and as shown by a one-dot chain line in FIG. It gradually becomes lighter from low to high. Therefore, as shown by a broken line in FIG. 5, the key touch feeling at the key release / position key operation positions W1 and B1 located behind the key press / release key operation positions W0 and B0 by the distance d is gradually increased from the low tone to the high tone. It is lighter. However, since the length of the key varies depending on the sound range, the difference between the key touch feeling at the key pressing / releasing operation positions W0 and B0 and the key touch feeling at the key pressing / releasing operation positions W1 and B1 increases as the sound goes from low to high. Become. That is, the difference in key touch feeling due to the difference in the front-rear direction of the pressing / releasing key operation position is small in the bass part L, medium in the middle part M, and large in the high part H.

  When the white key 11w and the black key 11b are released, the front end of the hammer 16w and the hammer 16b is displaced upward by its own weight. At this time, the drive part 11w1 and the drive part 11b1 are urged upward by the leg part Fw2 and the leg part Fb2, respectively, and the front end parts of the white key 11w and the black key 11b are displaced upward, respectively. On the other hand, when the white key 11w and the black key 11b are pressed, the lower end surfaces of the driving unit 11w1 and the driving unit 11b1 press the upper surfaces of the leg portion Fw2 and the leg portion Fb2, respectively, and the front end portions of the hammer 16w and the hammer 16b are respectively downward. Displace to

  Moreover, the rail part 19 is extended in the left-right direction so that the front-end part of the adjacent rib 12d may be connected. The width in the front-rear direction of the rail portion 19 is narrower than the width in the front-rear direction of the front plate 12a and the rear plate 12b. A key guide 19w for guiding the swing of the white key 11w is formed so as to protrude upward from the upper surface of the rail portion 19. The key guide 19w enters the white key 11w from below, and the side surface of the key guide 19w and the inner surface of the side wall of the white key 11w are in sliding contact with each other when the key is pressed or released. Thereby, the slight displacement of the white key 11w in the left-right direction at the time of pressing and releasing is suppressed.

  In addition, the rail portion 21 extends in the left-right direction so as to connect the upper end portions of the adjacent ribs 12d and the portion located below the front end portion of the visible portion of the black key 11b. The width in the front-rear direction of the rail portion 21 is narrower than the width in the front-rear direction of the front plate 12a and the rear plate 12b. A key guide 21 b for guiding the swing of the black key 11 b is formed so as to protrude upward from the upper surface of the rail portion 21. The key guide 21b enters the black key 11b from below, and the side surface of the key guide 21b and the inner surface of the side wall of the black key 11b are in sliding contact with each other when the key is pressed or released. Thereby, the slight displacement of the black key 11b in the left-right direction at the time of pressing and releasing is suppressed.

  In addition, a notch 12d1 is formed in the middle portion of each rib 12d. In order to form the notch 12d1 by integral molding, a square-shaped through hole penetrating from the upper surface to the lower surface is provided in an intermediate portion of the front plate 12a located above the notch 12d1. And the elongate lower limit stopper 22 comprised with shock absorbers, such as a felt, is extended and fixed to the left-right direction through the notch 12d1 of the rib 12d at the lower surface of the front board 12a. The lower limit stopper 22 abuts against the rear portions of the hammer 16w and the hammer 16b when the key is pressed, and restricts the upward displacement of the rear ends of the hammer 16w and the hammer 16b, whereby the front ends of the white key 11w and the black key 11b. The downward displacement of the part is restricted. Further, an upper limit stopper 23 made of an impact absorbing material such as felt is fixed to the rear part of the frame FR. When the key is released, the lower end of the hammer 16w and the hammer 16b is restricted to contact the lower surface of the mass body 16w3 and the mass body 16b3, thereby controlling the lower end of the white key 11w and the black key 11b. Regulates upward displacement.

  In addition, a switch driving unit 24 is provided on the lower surface of the intermediate portion between the white key 11w and the black key 11b. The switch drive unit 24 is in contact with the upper surface of the switch SW disposed on the substrate 25. The switch SW is provided for each key, and is pressed along with the swing of each key to detect a pressed / released state of each key. The substrate 25 is provided with a through hole penetrating from the upper surface to the lower surface. The position of the through hole corresponds to the position of the boss 26 formed integrally on the upper surface of the front plate 12a. The board 25 is fixed to the key frame 12 by screwing the boss 26 through the through hole.

  A boss 27 is formed at the connecting portion between the rib 12 d and the rail portion 17. The keyboard device is fixed to the frame FR of the electronic musical instrument by providing a through hole in the frame FR of the electronic musical instrument and passing a screw through the through hole from below and screwing it into the boss 27.

  In the first embodiment of the present invention configured as described above, the white key 11w and the black key 11b of the bass part L are made longer than the white key 11w and the black key 11b of the middle part M, respectively. The white key 11w and the black key 11b are made shorter than the 11w and the black key 11b of the middle part M, respectively. In addition, the mass of the mass body is adjusted so that the key touch feeling at the front end of the key becomes lighter from low to high. Therefore, in the bass portion L, the difference in the key touch feeling in the longitudinal direction of the key can be reduced. In this way, in the bass portion L where the key touch feeling is relatively heavy, the difference in the key touch feeling in the longitudinal direction of the key is reduced, so that the position slightly closer to the fulcrum side of the key (for example, the middle of the key) It is possible to prevent the feeling of touching the key when the key is pressed and released from the rear of the part) from being too heavy and difficult to play. Further, the difference in the key touch feeling in the longitudinal direction of the key in the middle sound portion M is slightly larger than the difference in the key touch feeling in the longitudinal direction of the key in the bass portion L. Further, the difference in the key touch feeling in the longitudinal direction of the key in the key of the treble part H is slightly larger than the difference in the key touch feeling in the longitudinal direction of the key in the middle sound part M. However, in the middle sound part M and the high sound part H in which the mass touch of the mass body is adjusted to make the key touch feeling relatively light at the front end, there is a problem in performance even if the key touch feeling in the longitudinal direction of the key is slightly different. There is no. Therefore, a space can be provided behind the bass part L and the treble part H. That is, the area occupied by the keyboard device in the electronic musical instrument can be reduced. And other parts (power transformer, speaker, etc.) which comprise an electronic musical instrument can be arranged in the space, and the limited space inside the main body of the electronic musical instrument can be used efficiently.

(Second Embodiment)
Hereinafter, a second embodiment of the present invention will be described with reference to the drawings. In the second embodiment, as shown in FIG. 6, the white key 11w and the black key 11b of the bass part L are shorter than the white key 11w and the black key 11b of the middle part M, respectively, and the white key 11w of the treble part H and The black keys 11b are shorter than the white key 11w and the black key 11b of the middle tone part M, respectively. The white key 11w and the black key 11b of the bass part L are longer than the white key 11w and the black key 11b of the treble part H, respectively. In other words, with respect to the key length, the middle sound portion M and the low sound portion L of the first embodiment are replaced. Also in the second embodiment, the rear end of the key frame 12 is formed along the rear end position of the key. Further, similarly to the first embodiment, the mass of the mass body is adjusted so that the key touch feeling gradually becomes lighter from the low sound portion side toward the high sound portion side. Since other configurations are the same as those of the first embodiment, the description thereof is omitted. The white key 11w and the black key 11b of the bass part L may be the same length as the white key 11w and the black key 11b of the treble part H, respectively, or may be longer than the white key 11w and the black key 11b of the treble part H, respectively. It may be shortened.

  In the second embodiment of the present invention configured as described above, the white key 11w and black key 11b of the bass part L are shorter than the 11w and black key 11b of the middle part M, respectively, and the white key of the high part H is obtained. 11w and the black key 11b were made shorter than the 11w and the black key 11b of the middle part M, respectively. Therefore, the difference in the key touch feeling in the longitudinal direction of the key in the bass part L is larger than the difference in the key touch feeling in the longitudinal direction of the key in the middle sound part M. Further, the difference in the key touch feeling in the longitudinal direction of the key in the treble part H is larger than the difference in the key touch feeling in the longitudinal direction of the key in the middle sound part M. That is, in the present embodiment, the difference in the key touch feeling in the longitudinal direction of the key of the middle sound part M that is commonly used is compared with the difference in the key touch feeling in the longitudinal direction of the keys of the bass part L and the high sound part H. And made it smaller. Therefore, a keyboard device that is substantially easier to perform than the first embodiment can be configured. In addition, since a space can be provided behind the bass part L and the treble part H, other parts other than the keyboard device can be arranged in the electronic musical instrument. In particular, the other parts can be arranged symmetrically. For example, if the speakers are arranged symmetrically, an electronic musical instrument that can be played back in stereo and has a small width in the front-rear direction can be realized.

  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.

  In the first embodiment and the second embodiment, the entire sound range is divided into the low sound part L, the middle sound part M, and the high sound part H, but the number of divisions is further increased, and the length of the key for each divided sound range. You may set it. For example, as shown in FIG. 7, the entire sound range may be divided into seven sound ranges, and the lengths of the white key 11w and the black key 11b may be set for each divided sound range. That is, it is divided into a first bass part L1, a second bass part L2, a first middle tone part M1, a second middle tone part M2, a third middle tone part M3, a first treble part H1, and a second treble part H2. The lengths of the white key 11w and the black key 11b may be shortened stepwise for each of the divided sound ranges from the low sound range to the high sound range. The white key 11w (A0), the black key 11b (A # 0), and the white key 11w (B0) are included in the first bass part L1. Further, as shown in FIG. 8, among the divided ranges, the length of the key belonging to the second middle tone part M2 including the central white key 11w (C4) is made the longest, and the second middle tone part M2 You may shorten the length of the white key 11w and the black key 11b for every said divided | segmented sound range as it goes to a high sound side and a low sound side. Further, the number of divisions may be further increased as compared with the examples of FIGS. 7 and 8, and the lengths of the white key 11w and the black key 11b are set for each key as they go from the bass key to the treble key. It may be gradually shortened. Further, the white key 11w (C4) and the black key 11b (C # 4) are set to be the longest, and the white key 11w (C4) and the black key 11b (C # 4) are moved toward the high tone side key and the low tone side key. The lengths of the white key 11w and the black key 11b may be gradually shortened for each key.

  Moreover, in the said 1st Embodiment, 2nd Embodiment, and those modifications, the distance from the through-hole Kw and the through-hole Kb to the back end of a key was made the same in all the white keys 11w and the black keys 11b. However, as will be described below, in order to increase the torsional rigidity of the key, the longer the key, the longer the distance from the through hole Kw and the through hole Kb to the rear end of the key, the through hole Kw and the through hole Kb. You may set the position to provide. When the key pressing position is the left end or the right end of the key, twisting occurs about the longitudinal axis of the key. The amount of twist increases as the distance from the key fulcrum to the key pressing / releasing position increases. That is, the longer the key, the greater the potential for twisting. Therefore, as described above, the longer the key, the longer the portion behind the through hole Kw and the through hole Kb, the longer the key, the higher the torsional rigidity, and the prevention of the occurrence of a large twist. Note that the positions where the through holes Kw and the through holes Kb are provided are determined according to the length of the key only in a part of the sound range, and the distance from the rear end of the key in other sound ranges regardless of the length of the key. Each of the through holes Kw and the through holes Kb may be provided so as to be the same.

  Moreover, in the said 1st Embodiment, 2nd Embodiment, and those modifications, the front end side of the white key 11w and the black key 11b was urged | biased upwards with the hammer 16w and the hammer 16b, respectively. However, instead of the hammer 16w and the hammer 16b, the front ends of the white key 11w and the black key 11b may be biased upward by a spring. In this case, for each key, the spring constant and the urging force of the spring in the key release state may be adjusted to reduce the key touch feeling from the low sound portion L to the high sound portion H. In this case, the dynamic load is almost the same for all the keys, and the static load is gradually reduced from the low-side key to the high-side key. Moreover, you may use a hammer and a spring together.

  In the first embodiment, the second embodiment, and the modifications thereof, the key touch feeling at the front end of the key is gradually reduced from the bass key toward the treble key. The key touch feeling at the front end of the key in each sound range may be the same, and the key touch feeling may be lightened step by step for each sound range toward the high sound range. Further, the key touch feeling may be lightened in order of pitch only in a part of the sound range.

11w ... White key, 11b ... Black key, 11w1, 11b1 ... Drive part, 12 ... Key frame, 13 ... Key support part, 16w, 16b ... Hammer, 16w1, 16b1 .. Base part, 16w2, 16b2 ... Connecting rod, 16w3, 16b3 ... Mass body, 18w, 18b ... Hammer support part, Pw1, Pb1 ... Contact part, FR ... Frame, L ..Lower part, M ... middle part, H ... higher part

Claims (4)

A plurality of white keys and black keys, each of which is assigned a pitch, and is pressed and released by the performer and supported so as to be swingable around a swing center provided at the rear end,
In a keyboard device for an electronic musical instrument comprising reaction force applying means for applying a reaction force to the pressing / releasing key operation to each of the plurality of white keys and black keys,
Among the plurality of white keys and black keys, a white key and black key belonging to a second sound range lower than the first sound range is used as a rocking center portion of the white key and black key belonging to a predetermined first sound range. The white key belonging to the first range is shorter than the white key belonging to the second range, and the black key belonging to the first range is set to the first range. Make it shorter than the black keys belonging to the two ranges,
The reaction force applied to the front end portion of the white key and black key belonging to the first sound range is made smaller than the reaction force applied to the front end portion of the white key and black key belonging to the second sound range. Electronic musical instrument keyboard device. The keyboard device for an electronic musical instrument according to claim 1,
Among the plurality of white keys and black keys, a plurality of keys in at least one of the first range and the second range, and a central axis of a swing center of the plurality of keys having continuous pitches A keyboard device for an electronic musical instrument characterized by having a common sound. The keyboard device for an electronic musical instrument according to claim 1 or 2,
Among the plurality of white keys and black keys, the rocking center portion of the white key and black key belonging to the third sound range that is lower than the second sound range is used as the white key and black key belonging to the second sound range. Provided at a position farther from the performer than the rocking center, the white key belonging to the third sound range is longer than the white key belonging to the second sound range, and the black key belonging to the third sound range is the second key. Make it longer than the black keys belonging to the range,
The reaction force applied to the front end portion of the white key and black key belonging to the third sound range is made larger than the reaction force applied to the front end portion of the white key and black key belonging to the second sound range. Electronic musical instrument keyboard device. The keyboard device for an electronic musical instrument according to claim 1 or 2,
Among the plurality of white keys and black keys, the white key and the black key belonging to the second sound range are moved at the central part of the white key and the black key belonging to the third sound range that is lower than the second sound range. The white key belonging to the third range is shorter than the white key belonging to the second range, and the black key belonging to the third range is set to the second range. Shorter than black keys belonging to
The reaction force applied to the front end portion of the white key and black key belonging to the third sound range is made larger than the reaction force applied to the front end portion of the white key and black key belonging to the second sound range. Electronic musical instrument keyboard device.

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