JP2014010375A - Key board device of electric musical instrument - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a key board device of an electric musical instrument formed by setting key fulcrums at different positions to simulate key touch feeling and an appearance of a key board device of an acoustic piano.SOLUTION: A key board device of an electric musical instrument includes a plurality of white keys 11w and black keys, and a plurality of hammers 16w and hammers engaged with the plurality of white keys 11w and the black keys. Each of driving parts of a first key and a second key serving as the white keys or the black keys has the same length in a vertical direction. A position in a longitudinal direction of a hammer fulcrum of a first hammer engaged with the first key is the same as that of a second hammer engaged with the second key. A position in the vertical direction of a hammer fulcrum of the first hammer, and that of the second hammer, are determined depending on a distance from a front end of an operation part of the first key to a key fulcrum thereof and that of the second key to a key fulcrum thereof, respectively.

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 plurality of hammers are common parts. The length from the pivot 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. In addition, the position of the pivot point of the hammer is gradually shifted rearward from the bass part to the treble part, and the distance from the key pivot point to the engagement position between the hammer and the key is the same for all keys. I have to.

Japanese Patent No. 3074794

  In the conventional keyboard device, an upper limit stopper for restricting upward displacement of the key is provided behind the front end of the key (end on the player side). And the engaging part extended below from the lower surface of the key contacts the upper limit stopper. In the key release state, the key is inclined so that the rear end side is lower than the front end side. Therefore, if the vertical length of the engaging portion is common to a plurality of keys, the height of the portion located near the upper contact point of the upper limit stopper in the key release state in the key release state is increased. Are the same. And since the inclination angle of the key in a key release state is so large that a short key is short, the position of the front end is so high that the short key of the said several keys. As described above, the appearance of the conventional keyboard device is not considered.

  In the conventional keyboard device, a lower limit stopper for restricting upward displacement of the key is also provided behind the front end of the key. Then, the lower surface of the engaging portion comes into contact with the lower limit stopper. Therefore, the shorter the key among the plurality of keys, the larger the swing range of the front end of the key. The hammer is engaged with the key behind the engaging portion. The shorter the key hammer, the closer the fulcrum part is to the engaging part. For this reason, the position of the hammer that engages with the short key is higher in the key release state in the key release state. Accordingly, the hammer that engages with a shorter key has a larger range of rocking in conjunction with the key. In the above conventional keyboard device, the hammer can swing away from the key, but as described above, the range in which the hammer swings in conjunction with the key swing varies depending on the length of the key to be engaged. Therefore, the timing (or key pressing depth) at which the hammer moves away from the key varies depending on the key length. The difference in timing at which the hammer moves away from the key is considered to affect the key touch feeling, but this point is not taken into consideration in the conventional keyboard device.

  The present invention has been made to solve the problems related to the appearance of the keyboard device among the problems of the conventional keyboard device. That is, an object of the present invention is to provide an electronic musical instrument keyboard device that simulates the key touch feeling and appearance of an acoustic piano keyboard device by changing the position of a fulcrum of a key. 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 object, the feature of the present invention is that each of the key fulcrum portions (Kw, 13w1, Kb, 13b1) is supported so that the front end swings in the vertical direction by the player's key release operation. A plurality of white keys in which ridge lines extending in the front-rear direction are formed at the intersection between the upper surface and the upper surface, and an intersection between the lower side surface and the upper side surface inclined inward with respect to the lower side surface A plurality of black keys formed with ridge lines extending in the front-rear direction, each having an operation part that is operated to press and release keys and a drive part (11w1, 11b1) that extends downward, Engaging a plurality of white keys and a plurality of black keys (11w, 11b) with different distances from the front end of the unit to the key fulcrum part, and the drive units of the plurality of white keys and the plurality of black keys. Oscillates in conjunction with the oscillation of the plurality of white keys and the plurality of black keys. A plurality of hammers (16w, 16b) respectively supported by hammer fulcrum portions (Hw, 18w1, Hb, 18b1), and a plurality of white keys and a plurality of black keys by restricting swinging of the plurality of hammers And a restriction member (20, 21) that defines a swing range of the first key and the first key that are white keys or black keys of the plurality of white keys and the plurality of black keys. The lengths in the vertical direction of the drive units of the two keys are common, and the vertical positions of the front ends of the operation units of the first key and the second key are in the released state of the first key and the second key. The vertical position of the hammer fulcrum portion of the first hammer engaged with the first key and the vertical position of the hammer fulcrum portion of the second hammer engaged with the second key so as to be the same. The position of the direction is defined by the distance from the front end of the first key operation unit to the key fulcrum unit and From the front end of the operating unit that has been set to the position corresponding to the distance to the key fulcrum. In the state where the braking force for braking the hammer by the regulating member is transmitted through the engaging portion between the key and the hammer, the swinging of the key is substantially regulated by the regulating member of the hammer. Consider a state. The key release state is a state in which the upward displacement of the front end of the key operation unit is restricted.

  In this case, the first key and the second key drive unit are respectively provided behind the front ends of the first key and the second key operation unit, and the first key and the second key drive unit start from the front end of the first key operation unit. The distance to the fulcrum is longer than the distance from the front end of the operation part of the second key to the key fulcrum, and the hammer fulcrum of the first hammer is located above the hammer fulcrum of the second hammer. It is good to have.

  In this case, the first key and the second key drive unit are provided in front of the front ends of the first key and the second key operation unit, respectively, and the front end of the first key operation unit is provided. The distance from the key fulcrum to the key fulcrum is longer than the distance from the front end of the second key operation unit to the key fulcrum, and the hammer fulcrum of the first hammer is lower than the hammer fulcrum of the second hammer. Good location.

  In this case, the first key and the second key are adjacent white keys, and are located between the first key, the second key, and the first key and the second key. In the key release state of the black key, the ridgeline of the black key may be located between the upper surface of the first key and the upper surface of the second key.

  In this case, the first key and the second key are adjacent white keys, and are located between the first key, the second key, and the first key and the second key. In a state where the black key is pressed and the swing of the first key, the second key, and the black key is restricted, the ridgeline of the black key is from the upper surface of the first key and the upper surface of the second key. Is also preferably located below. The state in which the swing is restricted is a state in which, for example, the same load is applied to the front end of the white key and the front end of the black key to restrict the swing of the key. In addition, the present invention includes a case where a part of the ridgeline of the black key is located below the upper surface of the first key and the upper surface of the second key.

  According to the present invention, by setting the vertical position of the hammer fulcrum according to the length of the key, the vertical position of the engagement point where the key and the hammer are engaged in the key release state is varied. Thus, the heights of the front ends of the first key and the second key in the key release state can be made uniform. Thereby, the external appearance of the keyboard apparatus of the acoustic piano in the key release state can be simulated.

  Another feature of the present invention is that the distance between the plane including the ridgeline of the first key and the key fulcrum portion of the first key, the key fulcrum of the plane including the ridgeline of the second key and the second key. The distance is the same as that of the part. In this case, the vertical positions of the key fulcrum portions of the first key and the second key may be the same. According to this, it is possible to share as much as possible parts other than the key length. In addition, the design of the support member (frame) that supports the key is simple. In addition, the support member can be easily processed and the accuracy can be improved.

It is a top view of the keyboard apparatus which concerns on one Embodiment of this invention. It is a right view which shows the structure regarding the white key of the bass part side of the keyboard apparatus of FIG. It is a right view which shows the structure regarding the white key by the side of the high sound part of the keyboard apparatus of FIG. It is a right view which shows the structure regarding the black key of the bass part side of the keyboard apparatus of FIG. It is a right view which shows the structure regarding the black key by the side of the high sound part 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.

  Hereinafter, an 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. Different pitches are assigned to the plurality of white keys 11w and the plurality of black keys 11b, respectively. In the present embodiment, one pitch of “C3”, “D3”... “C6” is assigned to the white key 11w, and “C #” is assigned to the black key 11b. 3 ”,“ D # 3 ”...“ B # 5 ”is assigned to any one pitch. The white key 11w and the black key 11b are each integrally molded in a long shape with a synthetic resin. The length of the white key 11w is gradually shortened from the white key 11w of the bass part toward the white key 11w of the treble part, and the black key 11b is gradually shortened from the black key 11b of the bass part to the black key 11b of the treble part. The length is gradually shortened. The rear end position of the black key 11b is located behind the rear end of the adjacent white key 11w.

  The white keys 11w having different assigned pitches have different lengths in the front-rear direction, but the other configurations are the same. The black keys 11b having different assigned pitches have different lengths in the front-rear direction, but the other configurations are the same. As shown in FIGS. 2 to 5, 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. And the white key 11w and the black key 11b are supported by the key support part 13w and the key support part 13b of the key frame 12 mentioned later by the through-hole Kw and the through-hole Kb. In the key release state, the white key 11w and the black key 11b are inclined so that the rear end is lower than the front end. When this keyboard device is assembled to the casing of the electronic musical instrument, the rear end portion of the white key 11w enters the inside of the casing of the electronic musical instrument. A portion in front of the portion entering the inside of the housing is referred to as an apparent portion of the white key 11w. Further, a ridge line is formed at a portion where the side surface and the upper surface of the white key 11w intersect. Further, in a state where the black key 11b is not pressed and the adjacent white key 11w is not pressed, the black key 11b has a portion protruding upward from the upper surface of the white key 11w. This protruding portion is called an apparent portion of the black key 11b. Further, a portion below the apparent portion of the black key 11b is referred to as a main body portion. The performer performs a key release operation on the apparent portions of the white key 11w and the black key 11b. That is, the apparent portion corresponds to the operation portion of the present invention. The apparent width of the black key 11b is narrower in the left-right direction toward the upper end, and the width in the left-right direction of the main body is constant. That is, the side surface of the apparent portion is inclined inward with respect to the side surface of the main body portion. A ridge line R is formed at the boundary between the visible portion of the black key 11b and the main body (see FIGS. 4 and 5).

  The key frame 12 has an upper plate portion 12a extending in the front-rear direction and the left-right direction. The position of the front end of the upper plate portion 12a on the low sound portion side and the front end of the high sound portion side is the same, but the rear end of the low sound portion side is located behind the rear end of the high sound portion side. The key frame 12 includes a front plate portion 12b that extends vertically downward from the front end of the upper plate portion 12a, a bottom plate portion 12c that extends horizontally from the lower end of the front plate portion 12b, and a bottom plate portion 12c. It has a front plate portion 12d extending vertically upward from the front end. The key frame 12 has a rear plate portion 12e extending vertically downward from the rear end of the upper plate portion 12a and a bottom plate portion 12f extending horizontally rearward from the lower end of the rear plate portion 12e. The height of the bottom surface of the bottom plate portion 12c is the same as the height of the bottom surface of the bottom plate portion 12f, and this keyboard is fixed by bringing the bottom surface of the bottom plate portion 12c and the bottom surface of the bottom plate portion 12f into contact with the frame FR of the electronic musical instrument. The apparatus is supported on the frame FR of the electronic musical instrument. The key support portion 13w and the key support portion 13b are formed so as to protrude upward from the upper surface of the upper plate portion 12a. The key support part 13b is located behind the adjacent key support part 13w. Each of the key support portion 13w and the key support portion 13b is formed in two opposing plate shapes, and includes a protruding portion 13w1 and a protruding portion 13b1 that are opposed to each other inside. The protrusion 13w1 and the protrusion 13b1 are fitted in the through hole Kw and the through hole Kb. Thereby, the white key 11w and the black key 11b are supported so as to be rotatable around the protruding portion 13w1 and the protruding portion 13b1, respectively, and the center axis of the through hole Kw and the through hole Kb, and the protruding portion 13w1 and the protruding portion 13b1 is pivoted. As described above, the front end portion can swing in the vertical direction. The vertical positions of the protrusion 13w1 and the protrusion 13b1 are common to all the key support portions. That is, the height of the swing center of all the keys is common. The vertical distance from the upper surface of the apparent part of the white key 11w (or the plane including the left and right ridge lines of the white key 11w) to the center of the swing is common to all the white keys 11w. Further, the vertical distance from the upper surface of the operation portion of the black key 11b (or the plane including the left and right ridge lines R of the black key 11b) to the center of the swing is common to all the black keys 11b.

  Further, a drive portion 11w1 extends downward from an intermediate portion of the apparent 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. The vertical length of the drive unit 11w1 is common to all the white keys 11w. On the other hand, the black key 11b has the same drive unit 11b1 as the white key 11w. However, the drive portion 11b1 includes a connecting portion that extends downward from the front end of the visible portion of the black key 11b and slightly curves forward, and a vertical portion that extends downward from the tip of the connecting portion. . The configuration of the vertical part is the same as that of the drive part 11w1. The vertical length of the drive unit 11b1 is also common to all the black keys 11b.

  The distance Lw1 in the front-rear direction from the front end of the white key 11w to the drive unit 11w1 is the distance Lw2 from the front end of the highest-tone white key 11w (that is, the shortest key among the plurality of white keys 11w) to the through hole Kw. Within 30%. The distance Lw1 is common to all the white keys 11w. The distance Lb1 in the front-rear direction from the front end of the visible portion of the black key 11b to the drive portion 11b1 is the height of the visible portion of the black key 11b of the highest tone (that is, the shortest key among the plurality of black keys 11b). It is within 30% of the distance Lb2 from the front end to the through hole Kb. The distance Lb1 is common to all the black keys 11b. And in the key release state of the white key 11w and the black key 11b, the position of the drive part 11w1 and the drive part 11b1 in the front-back direction is the same. That is, the drive unit 11w1 and the drive unit 11b1 are located in front of the front end of the black key 11b, and the drive unit 11w1 and the drive unit 11b1 are arranged in parallel in the left-right direction.

  The lower end portions of the drive portion 11w1 and the drive portion 11b1 engage with the front end portions of the hammer 16w and the hammer 16b, respectively, in an upward opening provided between the front plate portion 12b and the front plate portion 12d. ing. As will be described in detail later, the hammer 16w and the hammer 16b swing in conjunction with the swing of the engaged white key 11w and black key 11b, respectively.

  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. A hammer support portion 18w and a hammer support portion 18b are formed on the lower surface of the upper plate portion 12a so as to protrude downward. 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 of the hammer support portion 18w and the hammer support portion 18b in the front-rear direction are the same for all the hammer support portions 18w and the hammer support portions 18b. The positions of the protrusions 18w1 and the protrusions 18b1 in the front-rear direction are the same for all the hammer support parts 18w and the hammer support parts 18b. The protrusion 18w1 is provided at a lower position as the hammer support 18w of the hammer 16w of the white key 11w having a higher assigned pitch. Further, the protrusion 18b1 is provided at a higher position as the hammer support portion 18b of the hammer 16b of the black key 11b having a higher assigned pitch.

  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 front plate 12b is provided with a slit-like opening 12b1 that is long in the vertical direction for each of the hammer 16w and the hammer 16b. The front ends of the hammers 16w and the hammers 16b pass through the opening 12b1 and protrude forward from the front plate 12b. 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. A mass body 16w3 and a mass body 16b3 described below are assembled at the rear ends of the coupling rod 16w2 and the coupling rod 16b2.

  The mass body 16w3 and the mass body 16b3 are formed in a plate shape. The mass body 16w3 and the mass body 16b3 are long in the front-rear direction. The mass body 16w3 and the mass body 16b3 are assembled to the connecting rod 16w2 and the connecting rod 16b2 so that the plate thickness direction is the left-right direction. In the key release state, the lower surface of the mass body 16w3 is inclined with respect to the upper surface of the frame FR, and the rear side of the lower surface of the mass body 16w3 is located above the front side. In the key release state, the lower surface of the mass body 16b3 is inclined with respect to the upper surface of the frame FR, and the rear side of the lower surface of the mass body 16b3 is positioned below the front side. Further, in the key depression state, the upper surfaces of the mass body 16w3 and the mass body 16b3 are parallel to the lower surface of the upper plate portion 12a of the frame 12. The external shape of the mass body 16w3 is common to all the hammers 16w. Further, the outer shape of the mass body 16b3 is common to all the hammers 16b.

  As described above, the position of the fulcrum of the key varies depending on the assigned pitch. Therefore, the distance from the swing center of the white key 11w to the engaging portion Pw1 where the leg portion Fw2 and the driving portion 11w1 engage (contact) varies depending on the assigned pitch. Further, the distance from the swing center of the black key 11b to the engaging portion Pb1 where the leg portion Fb2 and the driving portion 11b1 are engaged (contacted) also varies depending on the assigned pitch. Furthermore, 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 positioned in front of the engaging portion Pw1, whereas in the black key 11b, The key-release key operation position B0, which is the front end of the position where the key-release key may be operated, is located behind the engaging portion Pb1. Therefore, if the mass bodies of all the hammers have the same mass, the key touch feeling of the middle sound part is heavier than the low sound part at the press and release key operation positions W0 and B0 by the lever principle. The key touch of the treble is even heavier.

  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 key 11b is heavier than the key touch feeling of the two adjacent white keys 11w. Therefore, as shown in FIG. 6, the masses of the mass body 16w3 and the mass body 16b3 are adjusted for each key. That is, in the characteristic curve diagram representing the masses of the mass body 16w3 and the mass body 16b3 in the order of pitches, the characteristic curve of the mass body 16w3 and the characteristic curve of the mass body 16b3 are parallel curves with a lower right side, and the mass body 16b3 The masses of the mass body 16w3 and the mass body 16b3 are adjusted so that the characteristic curve is positioned below the characteristic curve of the mass body 16w3. As a result, as indicated by the alternate long and short dash line in FIG. 7, the key touch feeling at the press / release key operation positions W0 and B0 is gradually lightened from the low tone to the high tone. Therefore, as shown by the broken lines in FIG. 7, the key touch feeling at the key release positions W1 and B1, which are located behind the key release positions W0 and B0 by the distance d, gradually increases from low to high. It is lighter. However, since the key length is shorter as the assigned pitch is higher, the difference between the key touch feeling at the press / release key operation positions W0, B0 and the key touch feeling at the press / release key operation positions W1, B1 is as follows. Increases from low to high. 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, intermediate in the middle part, and large in the high part.

  When the white key 11w and the black key 11b are released, the front ends of the hammer 16w and the hammer 16b are displaced upward by the weights of the hammer 16w and the hammer 16b, respectively. 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

  The key frame 12 is in contact with the upper surface of the mass body 16w3 and the mass body 16b3 of the hammer 16w and the hammer 16b when the key is depressed, thereby restricting the upward displacement of the rear end portions of the hammer 16w and the hammer 16b. A lower limit stopper 20 is provided for restricting downward displacement of the front end portions of the key 11w and the black key 11b. The lower limit stopper 20 includes a stopper rail 20a and a buffer material 20b. The stopper rail 20a protrudes downward from the lower surface of the intermediate portion of the upper plate portion 12a, and extends parallel to the key arrangement direction. The stopper rail 20a extends in parallel to the key arrangement direction. Further, the amount of protrusion from the lower surface of the front plate portion 12a at the contact portion of the stopper rail 20a with each hammer is constant in the left-right direction. The buffer material 20b is fixed to the lower end surface of the stopper rail 20a. The cushioning material 20b is a long member made of an impact absorbing material such as rubber or felt. The buffer material 20b has the same cross-sectional shape from one end to the other end.

  Further, the intermediate portion of the frame FR abuts against the lower surface of the mass body 16w3 and the mass body 16b3 of the hammer 16w and the hammer 16b when the key is released, thereby restricting downward displacement of the rear end portions of the hammer 16w and the hammer 16b. Thus, an upper limit stopper 21 is provided for restricting the upward displacement of the front end portions of the white key 11w and the black key 11b. Similar to the lower limit stopper 20, the upper limit stopper 21 includes a stopper rail 21a and a buffer material 21b. That is, the stopper rail 21a is extended in parallel with the key arrangement direction. The amount of protrusion from the frame FR is constant in the left-right direction. The buffer material 21b is fixed to the upper surface of the stopper rail 21a. Similarly to the buffer material 20b, the buffer material 21b has the same cross-sectional shape from one end to the other end. Moreover, the stopper rail 20a and the stopper rail 21a may be extended continuously, and may be extended intermittently. Further, the stopper rail 20a and the stopper rail 21a may be provided integrally with the upper plate portion 12a and the frame FR, respectively, or may be configured as separate parts and assembled to the upper plate portion 12a and the frame FR, respectively. You may do it.

  As described above, the protrusion 18w1 is provided at a lower position as the hammer support portion 18w of the hammer 16w of the white key 11w having a higher assigned pitch. Therefore, in the key release state, the engagement portion Pw1 between the high-pitched sound portion side hammer 16w and the drive portion 11w1 is positioned below the engagement portion Pw1 between the low sound portion-side hammer 16w and the drive portion 11w1.

  Further, as described above, in the key release state, the white key 11w is inclined so that the rear end is lower than the front end. Further, the vertical lengths of the drive units 11w1 of all the white keys 11w are the same. Further, the heights of the swing centers of all the white keys 11w are the same. Accordingly, when the vertical position of the engaging portion Pw1 in the key release state is the same, the position of the front end becomes higher as the white key 11w having a shorter length in the front-rear direction. Therefore, in the present embodiment, the engagement portion of the white key 11w on the high sound portion side is provided by providing the protrusion 18w1 at a lower position as the hammer support portion 18w of the hammer 16w of the white key 11w having a higher assigned pitch. The heights of the front ends of all the white keys 11w are aligned so that Pw1 is positioned below the engaging portion Pw1 of the white key 11w on the bass portion side. That is, by setting the vertical position of the protruding portion 18w1 according to the length of the white key 11w, the heights of the front ends of all the white keys 11w in the key release state are made uniform.

  Further, as described above, the protruding portion 18b1 is provided at a higher position as the hammer supporting portion 18b of the hammer 16b of the black key 11b having a higher assigned pitch. Therefore, in the key release state, the engagement portion Pb1 between the high-pitched sound portion side hammer 16b and the drive portion 11b1 is positioned higher than the engagement portion Pb1 between the low sound portion-side hammer 16b and the drive portion 11b1.

  Further, as described above, in the key release state, the black key 11b is inclined so that the rear end is lower than the front end. The vertical lengths of the drive portions 11b1 of all the black keys 11b are the same. Further, the heights of the swing centers of all the black keys 11b are the same. Accordingly, when the vertical position of the engaging portion Pb1 in the key release state is the same, the black key 11b having a shorter length in the front-rear direction has a lower front end position. Therefore, in this embodiment, the protrusion 18b1 is provided at a higher position in the hammer support portion 18b of the hammer 16b of the black key 11b having a higher assigned pitch, thereby engaging the engagement portion of the black key 11b on the treble portion side. The heights of the front ends of all the black keys 11b are aligned so that Pb1 is positioned above the engaging portion Pb1 of the black key 11b on the bass portion side. That is, by setting the vertical position of the protruding portion 18b1 according to the length of the black key 11b, the heights of the front ends of all the black keys 11b in the key release state are made uniform.

  In addition, in a state where the two adjacent white keys 11w and the black key 11b located between the two white keys 11w are released, the ridge line R of the black key 11b is a portion of the two white keys 11w. Of each hammer so that it is located below the upper surface of the white key 11w on the low sound portion side and above the upper surface of the white key 11w on the high sound portion side of the two white keys 11w. The swing angle is set.

  In a state where the white key 11w and the black key 11b adjacent to the white key 11w are respectively pressed with the same key pressing force and their swinging is restricted, the ridge line R of the black key 11b is the white key 11b. The swing angle of each hammer is set so as to be positioned below the upper surface of 11w. The buffer material 20b and the buffer material 21b have elasticity. Therefore, after the hammer contacts the cushioning material when the key is pressed, if the key is further pushed downward, the cushioning material is elastically deformed, so that the front end of the key is slightly displaced downward.

  In addition, a switch drive unit AC1 is provided on the lower surface of the intermediate part of the white key 11w and the black key 11b. The switch drive unit AC1 is a plate-like portion extending in the vertical direction inside the white key 11w and the black key 11b, and the lower end surface of the switch drive unit AC1 is in contact with the upper surface of the switch SW1. The switch SW1 is provided for each key, and is pressed by the key to detect the pressed / released state of each key. That is, when the switch SW1 is pressed by the key, the rubber main body is deformed and short-circuits the two contacts formed on the circuit board 23 to change from the OFF state to the ON state. The circuit board 23 extends in the left-right direction. The circuit board 23 is provided with a through hole penetrating from the upper surface to the lower surface. This through hole corresponds to a boss 24 formed integrally on the upper surface of the upper plate portion 12a. The circuit board 23 is fixed to the key frame 12 by screwing into the boss 24 through the through hole. The main body portions of the plurality of switches SW1 corresponding to the keys are juxtaposed on the upper surface of the circuit board 23 in the left-right direction. The positions of the switch SW1 for the white key 11w and the switch SW1 for the black key 11b in the front-rear direction are the same. The distance Lw3 in the front-rear direction from the front end of the white key 11w to the switch SW1 is within 30% of the distance Lw2 from the front end of the white key 11w of the highest sound to the through hole Kw, and the front end of the visible portion of the black key 11b The distance Lb3 in the front-rear direction from the switch SW1 to the switch SW1 is within 30% of the distance Lb2 from the front end of the visible portion of the highest tone black key 11b to the through hole Kb. Alternatively, the switch SW1 for the white key 11w and the switch SW1 for the black key 11b may be provided in parallel in the left-right direction, and the positions in the front-rear direction may be shifted.

  Further, a key guide 25w for guiding the swing of the white key 11w is formed so as to protrude upward from the upper end surface of the front plate portion 12d. The key guide 25w enters the white key 11w from below, and the side surface of the key guide 25w 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.

  Further, a key guide 25b for guiding the swing of the black key 11b is formed so as to protrude upward from the upper surface of the front end portion of the upper plate portion 12a. The key guide 25b enters the black key 11b from below, and the side surface of the key guide 25b 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.

  According to the keyboard device configured as described above, the heights of the front ends of the keys in the key release state are made uniform, so that the appearance of the keyboard device of the acoustic piano in the key release state can be simulated. Further, the productivity is higher than that of an acoustic piano keyboard device in which the number of spacers sandwiched between the fulcrum portion of the key and the frame is adjusted to adjust the height of the front end of the key.

  Further, the distance from the top surface of the white key 11w to the swing center is the same for all the white keys 11w, and the distance from the top surface of the main body of the black key 11b to the swing center is all. This is the same for the black key 11b. Therefore, for example, in the case where the through holes Kw and Kb are provided in another process after the outer shape of the white key 11w and the black key 11b is formed, this separate process can be made common to improve the productivity of the key. . In addition, since the vertical positions of the protrusions 13w1 and 13b1 of the key support part 13w and the key support part 13b are common to all the key support parts 13w and the key support part 13b, the frame FR for supporting the key Easy to design. Further, the frame FR can be easily processed, and the accuracy can be improved.

11w ... White key, 11b ... Black key, 11w1, 11b1 ... Drive part, 12 ... Key frame, 13w, 13b ... Key support part, 16w, 16b ... Hammer, 16w1, 16b1 ... Base, 16w2, 16b2 ... Connecting rod, 16w3, 16b3 ... Mass body, 18w, 18b ... Hammer support, 20 ... Lower limit stopper, 21 ... Upper limit stopper, Pw1, Pb1 ... engagement part, FR ... frame

Claims (7)

A plurality of white keys each supported by a key fulcrum so that the front end swings in the vertical direction by the player's pressing and releasing key operation, and a ridge line extending in the front-rear direction is formed at the intersection of the side surface and the top surface And a plurality of black keys formed with ridgelines extending in the front-rear direction at intersections between the lower side surface and the upper side surface inclined inward with respect to the lower side surface, A plurality of white keys and a plurality of black keys, each having an operation portion to be operated and a drive portion extending downward, and having different distances from the front end of the operation portion to the key fulcrum portion; ,
The plurality of white keys and the plurality of black keys are engaged with the drive portions, and supported by the hammer fulcrum so as to swing in conjunction with the swing of the plurality of white keys and the plurality of black keys. With multiple hammers,
In a keyboard device provided with a regulating member that regulates swinging of the plurality of hammers and defines swinging ranges of the plurality of white keys and the plurality of black keys,
The lengths in the vertical direction of the drive portions of the first key and the second key that are white keys or the black keys of the plurality of white keys and the plurality of black keys are made common,
When the first key and the second key are released, the first key and the second key have a front end of the operation portion of the first key and the second key so that the positions in the vertical direction are the same. The vertical position of the hammer fulcrum portion of the engaged first hammer and the vertical position of the hammer fulcrum portion of the second hammer engaged with the second key are defined by the first key. A keyboard device for an electronic musical instrument, characterized in that it is set at a position corresponding to the distance from the front end of the operation part to the key fulcrum part and the distance from the front end of the operation part of the second key to the key fulcrum part. The keyboard device for an electronic musical instrument according to claim 1,
The first key and the second key drive unit are respectively provided behind the front end of the first key and the second key operation unit,
The distance from the front end of the operation part of the first key to the key fulcrum part is longer than the distance from the front end of the operation part of the second key to the key fulcrum part,
A keyboard device for an electronic musical instrument, wherein the hammer fulcrum portion of the first hammer is positioned above the hammer fulcrum portion of the second hammer. The keyboard device for an electronic musical instrument according to claim 1,
The first key and the second key drive unit are provided in front of the front ends of the first key and the second key operation unit, respectively.
The distance from the front end of the operation part of the first key to the key fulcrum part is longer than the distance from the front end of the operation part of the second key to the key fulcrum part,
A keyboard device for an electronic musical instrument, wherein a hammer fulcrum portion of the first hammer is positioned below a hammer fulcrum portion of the second hammer. The keyboard device for an electronic musical instrument according to any one of claims 1 to 3,
The distance between the plane including the ridgeline of the first key and the key fulcrum portion of the first key is the same as the distance between the plane including the ridgeline of the second key and the key fulcrum portion of the second key. A keyboard device for an electronic musical instrument characterized by the above. The keyboard device for an electronic musical instrument according to any one of claims 1 to 4,
A keyboard apparatus for an electronic musical instrument, wherein the vertical positions of the key fulcrum portions of the first key and the second key are the same. The keyboard device for an electronic musical instrument according to any one of claims 1 to 5,
The first key and the second key are adjacent white keys,
In the key release state of the first key, the second key, and the black key located between the first key and the second key, the ridgeline of the black key is the first key. A keyboard device for an electronic musical instrument, wherein the keyboard device is located between the upper surface of the electronic key and the upper surface of the second key. The keyboard device for an electronic musical instrument according to any one of claims 1 to 6,
The first key and the second key are adjacent white keys,
The first key, the second key, and a black key located between the first key and the second key are pressed, and the first key, the second key, and An electronic musical instrument, wherein a ridgeline of the black key is located below the upper surface of the first key and the upper surface of the second key in a state where the swing of the black key is restricted Keyboard equipment.

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