JP2013041079A - Keyboard device of electronic musical instrument - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the cost of a keyboard device having a plurality of keys formed by resin molding, in which at least two keys to which different pitches are respectively allocated have different lengths.SOLUTION: Key base materials 11W, 11B are formed by resin molding. The key base materials 11W, 11B are the members commonly used to form a plurality of keys of which key pitches are different from each other. A plurality of cut parts 11W5 to 11W7, 11B5 to 11B7 are provided in the rear ends of the key base materials 11W, 11B at intervals in the longitudinal direction. The key base materials 11W, 11B are cut at cut parts corresponding to the key pitches of the keys to be formed. A key frame is provided for supporting the plurality of keys. The rear end part of a frame base material common to a plurality of electronic musical instruments different in type and having a plurality of support parts for supporting the plurality of keys is cut along the rear ends of the plurality of keys to form the key frame.

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. 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

  In the above conventional keyboard device, the length differs for each key. Therefore, when the keys are integrally formed by resin molding, it is necessary to manufacture a mold for each key, which is expensive.

  The present invention has been made in order to solve the above-described problem, and an object of the present invention is a keyboard device having a plurality of keys formed by resin molding, wherein at least two keys having different assigned pitches are used. The object is to reduce the cost of keyboard devices of different lengths. 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 present invention is characterized in that a plurality of pitches are assigned to each of the pitches, and the keys are pressed and released by the performer to swing around a swing center provided at the rear end. In a keyboard device for an electronic musical instrument comprising a key (11w, 11b) and a frame (12) that supports a plurality of keys, at least one of the plurality of keys is a key base formed by resin molding (11W, 11B), which is formed by removing a rear end portion of the key base material commonly used for forming the at least one key and any other key. In this case, the key base has a plurality of cutting portions (11W5 to 11W8, 11B5 to 11B8) provided at intervals in the front-rear direction, and the at least one key cuts the key base into a plurality of cuts. It is good to cut | disconnect in the cutting part corresponding to the pitch assigned to the said at least 1 key among the parts. In this case, the key base material has at least three cutting portions, and the plurality of cutting portions may be provided at equal intervals. In this case, the distance from the center of swing to the rear end of the key may be the same for all keys.

  According to the keyboard device configured as described above, a plurality of the same key base material is formed by resin molding, and the same key base material is cut at different positions, so that the assigned pitch is reduced. Different keys can be formed. That is, in order to form keys having different lengths, the types of molds can be reduced as compared with the case where molds for resin molding are produced for each key, so that the initial cost can be reduced. In addition, since the types of parts can be reduced, the management cost of parts can be reduced. Also, by varying the cutting position of the key base material according to the type of electronic musical instrument to be applied, various types of keyboard devices with different key touch feeling characteristics can be configured.

  Another feature of the present invention is that a plurality of keys belonging to a predetermined range among a plurality of keys are formed by simultaneously cutting a plurality of key base materials at a predetermined angle with respect to the arrangement direction of the plurality of keys. There is in being. According to this, the key base materials are arranged in the order of pitches, and the arranged key base materials are simultaneously cut by a cutting machine such as a bow saw machine, a band saw machine, or a circular saw machine, so that the processing time can be shortened.

  Another feature of the present invention resides in that the longer the key of the plurality of keys, the greater the distance from the swing center to the rear end of the key. If the key pressing position is the left end or right end of the key, twisting occurs around the longitudinal axis of the key, and the amount of twisting is large from the key fulcrum to the pressing key operating position. It gets bigger. That is, the longer the key, the greater the potential for twisting. Therefore, if configured as described above, the longer the key, the higher the torsional rigidity around the axis in the longitudinal direction of the key, and the occurrence of large torsion can be prevented.

  Another feature of the present invention is that the frame is a frame base material (12A) common to a plurality of electronic musical instruments of different types, and includes a plurality of support portions that respectively support a plurality of keys. In the rear end portion, the plurality of keys are formed by removing regions behind the rear ends of the plurality of keys when assembled to the plurality of support portions, respectively. In this case, the support part has a plurality of support members arranged at intervals in the front-rear direction, the key is supported by a support member corresponding to the length of the key among the plurality of support members, and the frame is The frame base material may be formed by removing a region behind the support member corresponding to the key length.

  According to the keyboard device configured as described above, since the frame base material is common to a plurality of electronic musical instruments of different types, the types of components can be reduced, and the management costs of the components can be reduced. In addition, since a space can be provided behind the short key, the limited space inside the main body of the electronic musical instrument can be used more efficiently.

1 is an overall schematic diagram of a keyboard device according to an embodiment of the present invention. It is a bottom view of the key base material for forming the key of the keyboard apparatus of FIG. It is a bottom view of the frame base material for forming the key frame of the keyboard apparatus of FIG. It is a right view about the white key of the high pitch part of the keyboard apparatus of FIG. It is a right view about the black key of the treble part of the keyboard apparatus of FIG. It is a characteristic view which shows the characteristic of the mass of a mass body. It is a characteristic view which shows the characteristic of a key touch feeling. It is the whole keyboard apparatus which concerns on the modification of this invention. It is a bottom view of the key base material for forming the key of the keyboard apparatus of FIG. It is the whole keyboard apparatus which concerns on the other modification of this invention. It is a bottom view of the key base material for forming the key of the keyboard apparatus of FIG. It is a bottom view of the frame base material for forming the key frame of the keyboard apparatus of FIG.

  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. The entire sound range (C3 to C6) of the keyboard device is divided into three sound ranges, a low sound portion L (C3 to B3), a mid sound portion M (C4 to B4), and a high sound portion H (C5 to C6). . 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.

  As shown in FIG. 2, the white keys 11w belonging to the middle tone portion M and the high tone portion H are resin-molded for each pitch name of the white key (that is, C, D, E, F, G, A, and B). Are formed by cutting the rear ends of the key base material 11W (C) to the key base material 11W (B) that are integrally formed. In the bass portion L, the key base material 11W (C) to the key base material 11W (B) are used as they are as the white key 11w without being cut. Each of the key base material 11W (C) to the key base material 11W (B) includes a front portion and a rear portion. The lateral width of the rear part is narrower than the lateral width of the front part. The rear part extends rearward from the rear end of the front part, and the connection position in the left-right direction between the rear part and the front part differs depending on the assigned pitch name. That is, the outer shape of the key base material 11W is different for each assigned pitch name. The configuration of the rear part is common to the key base material 11W (C) to the key base material 11 (B). Therefore, hereinafter, the key base material 11W (C) to the key base material 11W (B) will be described as the key base material 11W. However, when it is necessary to specify the assigned pitch name, the pitch name is attached to the reference numeral for explanation.

  On the lower surface of the rear end portion of the key base material 11W, four ribs 11W1 to 11W4 are provided in this order from the rear end toward the front end side. Between the adjacent ribs, a boundary portion without ribs is provided. The boundary portion between the rib 11W1 and the rib 11W2 is referred to as a first cutting portion 11W5, and the boundary portion between the rib 11W2 and the rib 11W3 is referred to as a second cutting portion 11W6. Moreover, the boundary part between rib 11W3 and rib 11W4 is called the 3rd cutting part 11W7. The distance between the first cutting part 11W5 and the second cutting part 11W6 is the same as the distance between the second cutting part 11W6 and the third cutting part 11W7. The white key 11w belonging to the middle sound portion M is formed by cutting the key base material 11W at the first cutting portion 11W5, and the white key 11w belonging to the high sound portion H is formed by cutting the key base material 11W into the second cutting portion 11W6. It is cut and formed.

  Similarly to the white key 11w, the black key 11b belonging to the middle sound part M and the high sound part H is also formed by cutting the rear end part of the key base material 11B integrally formed by resin molding. The key base material 11B is common to all the black keys 11b. On the lower surface of the rear end portion of the key base material 11B, four ribs 11B1 to 11B4 are provided in this order from the rear end toward the front end side. The boundary between the rib 11B1 and the rib 11B2 is called a first cutting part 11B5, and the boundary between the rib 11B2 and the rib 11B3 is called a second cutting part 11B6. Moreover, the boundary part between rib 11B3 and rib 11B4 is called 3rd cutting part 11B7. The distance between the first cutting part 11B5 and the second cutting part 11B6 is the same as the distance between the second cutting part 11B6 and the third cutting part 11B7. The black key 11b belonging to the middle sound part M is formed by cutting the key base material 11B at the first cutting part 11B5, and the black key 11b belonging to the high sound part H is formed by cutting the key base material 11B into the second cutting part 11B6. It is cut and formed. In the bass part L, the key base material 11B is not cut and used as it is as the black key 11b.

  Further, in a state where the key base materials 11W are arranged in the order of the pitch names and the key base material 11B is arranged between the predetermined key base materials 11W, the first cutting portion 11W5 to the third cutting portion 11W7 of each key base material. And the position of the front-back direction of 1st cutting part 11B5-3rd cutting part 11B7 is respectively the same (refer FIG. 2). Therefore, if the key base material 11W and the key base material 11B (hereinafter referred to as a key base material for one octave) for forming 12 keys belonging to one octave range are arranged as described above, a bow is obtained. A key base material for one octave is set in the cutting machine so that the blades of a cutting machine such as a saw machine, a band saw machine, a circular saw machine, etc. pass linearly through each first cutting part 11W5 and each first cutting part 11B5. can do. Thereby, the key base material for 1 octave can be simultaneously cut | disconnected by the 1st cutting part 11W5 and the 1st cutting part 11B5 using the said cutting machine. That is, the white key 11w and the black key 11b of the middle part M can be formed simultaneously. Further, if the key base material for one octave is arranged as described above and simultaneously cut by the second cutting part 11W6 and the second cutting part 11B6, the white key 11w and the black key 11b of the treble part H Can be formed simultaneously. The key base material for one octave may not be cut simultaneously, and the key base material 11W and the key base material 11B for several keys may be cut simultaneously.

  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 part H and their peripheral parts will be described, and the description of the middle sound part M and the low sound part L will be 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. In addition, the rear portions of the left and right side walls of the white key 11w and the black key 11b are subjected to drilling to provide opposing through holes Kw and through holes Kb, 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.

  As shown in FIGS. 3 to 5, the key frame 12 is formed by cutting the rear end portion of the frame base 12A. 3 is a view of the frame base material 12A as viewed from the bottom surface side. In FIG. 3, the left side is the high sound part side, and the right side is the low sound part side. In FIG. 3, in order to show the arrangement of the key support portions 13, some key support portions 13 among the key support portions 13 provided for each key are schematically shown by broken-line rectangles. In FIGS. 4 and 5, the part of the frame base material 12 </ b> A that has been cut out is indicated by a one-dot chain line. As will be described later, the frame base material 12A is a component that is commonly used to form a key frame of a plurality of types of keyboard devices with different key touch characteristics depending on the type of electronic musical instrument to be applied. The frame base 12A is integrally formed by resin molding and extends in the left-right direction. The frame base 12A extends in the left-right direction from the end on the high sound part side to the boundary between the low sound part L and the mid-sound part M, and further extends in the front-rear direction to reach the rear end of the frame base 12A. It has 1 cutting part 12A1. In addition, in front of the first cutting portion 12A1, it extends in the left-right direction from the end on the high sound portion H side to the boundary between the high sound portion H and the middle sound portion M, and further extends in the front-rear direction to perform the first cutting. It has 2nd cutting part 12A2 which reaches part 12A1. The first cutting portion 12A1 and the second cutting portion 12A2 are not formed with ribs 12d described later. Therefore, the first cutting part 12A1 and the second cutting part 12A2 are easier to cut than other parts.

  In the present embodiment, the length of the key is shortened step by step in the order of the low tone portion L, the mid tone portion M, and the high tone portion H. Therefore, the key base 12 is formed by cutting the frame base 12A with the first cutting portion 12A1 and the second cutting portion 12A2 so that the position of the rear end of the key frame 12 follows the position of the rear end of the key. doing. That is, the rear end of the key frame 12 is formed in a step shape in plan view. 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. Each key support portion 13 is formed along the rear end of the key frame 12. That is, 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 forward of the key support portion 13 of the mid tone portion M. Is provided. The position in the front-rear direction of each key support portion 13 in each sound range is the same.

  Each key support portion 13 is formed in the shape of two plates facing each other. A through hole 13a is provided in each of the two plate-like portions facing each other. The two through holes 13a are opposed to each other. Then, the white key 11w is sandwiched between the two plate-like portions facing each other, the positions of the through hole 13a and the through hole Kw are aligned, and the pin PN is inserted into the through hole 13a and the through hole Kw. Accordingly, the white key 11w is supported so as to be rotatable around the pin PN, and the front end portion of the white key 11w can swing in the vertical direction. The black key 11b is supported in the same manner as the white key 11w.

  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. Like the hammer 16w, the hammer 16b includes a base portion 16b1, a connecting rod 16w2, and a mass body 16b3. The base portion 16w1 and the base portion 16b1 are plate-like members and have 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 positioned in front of the winning 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 operation is likely to be performed (that is, the front end of the apparent portion), is located behind the winning 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. 6, the masses of the mass body 16w3 and the mass body 16b3 are adjusted for each key, and as shown in FIG. 7, the key touch feeling at the press and release key operation positions W0 and B0 is changed from low to high. It is lightening gradually toward 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 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.

  Moreover, the support | pillar 28 is provided between the adjacent ribs 12d. The column 28 has a lower end fixed to the frame FR and an upper end fixed to the lower surface of the rear end portion of the rear plate 12b. Thereby, it is the rear-end part of the rear board 12b, Comprising: The part between the adjacent ribs 12d is reinforced.

  In addition, on the upper surface side of the frame base material 12A, between the rear end of the frame base material 12A and the first cutting portion 12A1, and between the first cutting portion 12A1 and the second cutting portion 12A2, the horizontal direction A plurality of key support portions 13 are arranged side by side (see FIGS. 3, 4 and 5). In other words, in the treble portion H, three key support portions 13 are arranged in the front-rear direction for each pitch, and in the middle tone portion M, two key support portions 13 are provided in the front-rear direction for each pitch. It is installed side by side.

  For example, in a keyboard device in which the key length of the treble portion H is the same as the key length of the middle tone portion M, the frame base material 12A is cut by the first cutting portion 12A1 to form a key frame. Good. In this case, in the high sound part H, each key may be supported by each key support part 13 provided between the first cutting part 12A1 and the second cutting part 12A2. Further, in a keyboard device in which the key lengths of the high tone portion H and the mid tone portion M are the same as the key length of the low tone portion L, the key base frame 12A may be used as it is without being processed. In this case, in the high sound part H and the middle sound part H, each key may be supported by each key support part 13 provided between the rear end of the frame base 12A and the first cutting part 12A1.

  In the keyboard device configured as described above, the white key 11w and the black key 11b of the middle sound portion M and the high sound portion H are formed by cutting the rear ends of the key base material 11W and the key base material 11B, respectively. And the white key 11w and the black key 11b of the bass part L used the key base material 11W and the key base material 11B as they are. Therefore, since it is sufficient to manufacture a mold for forming a key base material for one octave, the initial cost can be reduced as compared with the case of manufacturing a mold for each key having a different length. Further, as described above, if the plurality of key base materials 11W and the key base material 11B are simultaneously cut and formed simultaneously with the plurality of white keys 11w and black keys 11b, the processing time can be shortened. Cost can be reduced compared to the case where the key base material 11B is cut one by one.

  Further, the frame base 12A is cut by the first cutting part 12A1 and the second cutting part 12A2, and the key frame 12 is formed so that the position of the rear end is along the rear end of each key. And a space can be provided behind the treble part H. That is, the area occupied by the keyboard device in the electronic musical instrument can be reduced. Therefore, other parts (power transformer, speaker, etc.) constituting the electronic musical instrument can be disposed in the space, and the limited space inside the main body of the electronic musical instrument can be used efficiently. The frame base 12A is a common component for forming a key frame for a plurality of types of keyboard devices having different key touch feeling characteristics. Therefore, the initial cost can be reduced as compared with the case of producing a mold for forming a key frame for each type of keyboard device. In addition, since the types of parts can be reduced, the management cost of parts can be reduced.

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

  For example, as shown in FIG. 8, the key support portions Kw and Kb may gradually approach the player side as the assigned pitch increases. That is, the white key 11w and the black key 11b may be gradually shortened as the assigned pitch increases. In the above embodiment, the key base material 11B is common to all pitch names of the black key, but in this case, the key base material 11B is changed to the black key pitch name (C #, D #... A #) may be provided. Hereinafter, the key base material 11B (C #) to the key base material 11B (A #) will be described as the key base material 11B. However, when it is necessary to specify the assigned pitch name, the pitch name is attached to the code. I will explain. As shown in FIG. 9, the key base material 11 </ b> W and the key base material 11 </ b> B have ribs 11 </ b> W <b> 1 to 11 </ b> W1 as the key base 11 </ b> W and the key base 11 </ b> B are arranged in the order of their pitch names from the bass side toward the treble side. The region of the rib 11W4 and the region of the ribs 11B1 to 11B4 are formed so as to gradually approach the player side. Thereby, except the key base material 11W (C), a rib-free portion is formed behind the rib 11W1 and the rib 11B1, and the rib-free portion formed behind the rib 11W1 and the rib 11B1 is respectively These are called the first cutting part 11W5 and the first cutting part 11B5. The key base material 11W (C) does not have the first cutting part 11W1. A boundary portion between the rib 11W1 and the rib 11W2 is referred to as a second cutting portion 11W6, and a boundary portion between the rib 11W2 and the rib 11W3 is referred to as a third cutting portion 11W7. Further, the boundary between the rib 11W3 and the rib 11W4 is referred to as a fourth cutting portion 11W8. Further, the boundary portion between the rib 11B1 and the rib 11B2 is referred to as a second cutting portion 11B6, and the boundary portion between the rib 11B2 and the rib 11B3 is referred to as a third cutting portion 11B7. Furthermore, the boundary part between rib 11B3 and rib 11B4 is called 4th cutting part 11B8. Similar to the above-described embodiment, the interval between adjacent cut portions is the same.

  Further, in a state where the key base material 11W (C) and the key base material 11W (B) are aligned with their front ends aligned, the second cutting portion 11W2 of the key base material 11W (C) It is located slightly ahead of the first cutting portion 11W1 of 11W (B).

  The white key 11w and the black key 11b belonging to the bass part L are formed by cutting the key base material 11W and the key base material 11B with the first cutting part 11W5 and the first cutting part 11B5, respectively, and belong to the middle sound part M The white key 11w and the black key 11b are formed by cutting the key base material 11W and the key base material 11B with the second cutting part 11W6 and the second cutting part 11B6, respectively. Further, the white key 11w and the black key 11b belonging to the treble part H are formed by cutting the key base material 11W and the key base material 11B at the third contact step part 11W7 and the third cutting part 11B7, respectively. In this case, the key base material 11W and the key base material 11B may be cut one by one. Each cutting part of the key base material 11W and the key base material 11B has a predetermined width in the front-rear direction. Therefore, if the key base material 11W and the key base material 11B are arranged and arranged in the order of pitch names, the blades of cutting machines such as a bow saw machine, a band saw machine, and a circular saw machine are used for the first cutting portions 11W5 and the first first cutting parts. The key base material for one octave can be set in the said cutting machine so that it may pass linearly through the cutting part 11B5. Thereby, the key base material for 1 octave can be simultaneously cut | disconnected by the 1st cutting part 11W5 and the 1st cutting part 11B5 using the said cutting machine. That is, the white key 11w and the black key 11b of the middle part M can be formed simultaneously. Further, if the key base material for one octave is arranged as described above and simultaneously cut by the second cutting part 11W6 and the second cutting part 11B6, the white key 11w and the black key 11b of the treble part H Can be formed simultaneously. In this case, the rear end surfaces of the white key 11w and the black key 11b have a predetermined angle with respect to the key arrangement direction. In this case as well, it is not necessary to simultaneously cut the key base material for one octave, and the key base material 11W and the key base material 11B for several keys may be cut simultaneously. Further, more key base materials 11W and key base materials 11B (for example, 24 keys constituting the middle sound portion M and the high sound portion H) may be cut simultaneously.

  In this case, in the frame base material 12A of the above-described embodiment, a plurality of key support portions 13 that gradually approach the front end side as it goes from the low sound portion side to the high sound portion side are further provided to support each key. That's fine. Further, the mass of the mass body may be adjusted so that the key touch feeling gradually becomes lighter as it goes from the bass key to the treble key. Other configurations are the same as those in the above embodiment, and thus the description thereof is omitted. Even if comprised in this way, the cost of a keyboard apparatus can be reduced similarly to the said embodiment.

  Further, as shown in FIG. 10, the rear end of the black key 11b may be positioned behind the rear end of the adjacent white key 11w. In this case as well, as with the key base material 11W, the key base material 11B may be provided for each pitch name of the black key. As shown in FIG. 11, in a state where the key base materials 11W are arranged in the order of pitch names and the key base material 11B is arranged between the predetermined key base materials 11W, the rear end of the key base material 11B is the key base. What is necessary is just to form the key base material 11W and the key base material 11B, respectively so that it may be located behind the rear end of the material 11W. In this state, the area of the ribs 11B1 to 11B4 of the key base material 11B may be positioned behind the area of the ribs 11W1 to 11W4 of the adjacent key base material 11W. Then, the region of the ribs 11W1 to 11W4 gradually approaches the front end in the order of the pitch names of the key base material 11W, and the region of the ribs 11B1 to rib 11B4 gradually approaches the front end in the order of the pitch names of the key base material 11B. What should I do? Further, as in the above-described embodiment, the interval in the front-rear direction of the cutting portion in each key is the same. However, the interval between the cut portions in the key base material 11B is slightly larger than the interval between the cut portions in the key base material 11W. In this case, as in the example described with reference to FIG. 9, the key base material 11W (C) does not have the first cutting portion 11W5.

  In addition, in a state where the key base material 11W (C) and the key base material 11W (B) are aligned with their front ends aligned, the second cutting portion 11W6 of the key base material 11W (C) has the key base material 11W (B ) Located slightly forward of the first cutting portion 11W5. Further, in a state where the key base material 11B (C #) and the key base material 11B (A #) are aligned with their front end positions aligned, the second cutting portion 11B6 of the key base material 11B (C #) is The key base 11B (A #) is positioned slightly forward of the first cutting part 11B5.

  Also in this case, as in the example described with reference to FIG. 9, the white key 11 w and the black key 11 b belonging to the bass part L include the key base material 11 </ b> W and the key base material 11 </ b> B as the first cutting part 11 </ b> W <b> 5 and the first cutting part. The white key 11w and the black key 11b, which are formed by cutting at 11B5 and belong to the middle sound part M, cut the key base material 11W and the key base material 11B at the second cutting part 11W6 and the second cutting part 11B6, respectively. Formed. Further, the white key 11w and the black key 11b belonging to the treble part H are formed by cutting the key base material 11W and the key base material 11B with the third cutting part 11W7 and the third cutting part 11B7, respectively. Also in this case, the key base material 11W and the key base material 11B may be cut one by one, but a plurality of key base materials may be simultaneously cut as follows. That is, if the key base material 11W for seven keys of the key base material 11W (C) to the key base material 11W (B) is arranged in the order of their pitch names, a cutting machine such as a bow saw machine, a band saw machine, a circular saw machine, etc. The key base material 11W for the seven keys can be set on the cutting machine so that the blades linearly pass through the first cutting portions 11W5. Thereby, the key base material 11W for 7 keys can be cut | disconnected simultaneously using the said cutting machine. That is, the white key 11w of the middle part M can be formed simultaneously. Moreover, if the key base material 11B for five keys from the key base material 11B (C #) to the key base material 11B (A #) is arranged in the order of their pitch names, cutting of a bow saw machine, band saw machine, circular saw machine, etc. The key base material 11B for the five keys can be set in the cutting machine so that the blade of the machine passes linearly through each first cutting part 11B5. Thereby, the key base material 11B for the five keys can be simultaneously cut using the cutting machine. That is, the black key 11b of the middle tone part M can be formed simultaneously. Further, the white key 11w of the high sound part H can be formed at the same time as the white key 11w of the middle sound part M is formed at the same time. Further, the black key 11b of the high sound part H can be formed simultaneously, in the same manner as the black key 11b of the middle sound part M is formed simultaneously. Also in this case, the rear end surfaces of the white key 11w and the black key 11b have a predetermined angle with respect to the key arrangement direction. In this case, the key base material 11W for several keys may be cut simultaneously. Further, more key base materials 11W (for example, 14 keys constituting the middle sound portion M and the high sound portion H) may be cut simultaneously. Moreover, you may cut | disconnect the key base material 11B for several keys simultaneously. Further, more key base materials 11B may be cut at the same time (for example, 10 keys constituting the middle sound portion H and the high sound portion H).

  Further, in this case, in the frame base material 12A of the above embodiment, the key support portion 13 for the black key is positioned behind the key support portion 13 for the adjacent white key, and from the bass portion toward the treble portion, The key support portion 13 for the white key and the key support portion 13 for the black key may be provided so as to gradually approach the front end side to support each key. Also, as shown in FIG. 12, it is preferable to provide a cutting portion 12A3 that forms a predetermined angle with respect to the key arrangement direction so that the frame base material 12A can be cut obliquely along the rear end of the black key 11b. In FIG. 12, the key support portion 13 is not shown. In this case, the frame base material 12A can be used in common among a plurality of types of keyboard devices having different key touch feelings, so that the first cutting portions 12A3 to 12A3 are different in angle with respect to the key arrangement direction. 5 cutting parts 12A7 are good to provide. And what is necessary is just to provide the some key support part 13 along each cutting | disconnection part. Moreover, in the said embodiment and its modification, although 1st cutting part 12A1 and 2nd cutting part 12A2 of 12 A of frame base materials were the parts without a rib, in this example, cutting part 12A3-12A7 Are a plurality of holes (ie, perforations) arranged at intervals. The first cutting part 12A1 and the second cutting part 12A2 of the above embodiment may be perforated. Moreover, each cutting part of the frame base material 12A may be a groove having a V-shaped cross section. The cost can also be reduced by the keyboard device configured as described above.

  In the above embodiment and its modification, the distance from the through hole Kw and the through hole Kb to the rear end of the key is the same for all the white keys 11w and the black keys 11b. In order to increase the torsional rigidity of the key, the position where the through hole Kw and the through hole Kb are provided is set so that the longer the key, the greater the distance from the through hole Kw and the through hole Kb to the rear end of the key. Good. That is, the positions where the white key 11w and the black key 11b belonging to the middle sound part M are provided with the through holes Kw and the through hole Kb are provided at the positions where the white key 11w and the black key 11b belonging to the high sound part H are provided. It may be set slightly ahead of the position. Furthermore, the white key 11w and the black key 11b belonging to the bass part L are provided with the through hole Kw and the through hole Kb, and the white key 11w and the black key 11b are provided with the through hole Kw and the through hole Kb. It may be set slightly ahead of the position. If the key pressing position is the left end or right end of the key, twisting occurs around the longitudinal axis of the key, and the amount of twisting is large from the key fulcrum to the pressing key operating position. It gets bigger. 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, although the sound range of the keyboard device in the above embodiment and its modification is 3 octaves, it may be a keyboard device with a wider sound range, or conversely, a keyboard device with a narrower sound range. Further, when the key length is varied stepwise as in the above embodiment, it is not necessary to vary the key length in units of one octave, and the key length may be varied for several keys. . Moreover, the space | interval between the cutting parts of the key base material 11W and the key base material 11B may be narrowed, and the number of cutting parts may be increased, and conversely, the space | interval between cutting parts is widened, and the number of cutting parts. May be reduced. Further, the interval between the cut portions may not be equal. For example, the closer to the front end side, the narrower the interval between the cut portions, and conversely, the closer to the rear end side, the narrower the interval between the cut portions. Further, some keys (for example, keys belonging to the middle tone part M and the high tone part H) are formed using the key base material 11W and the key base material 11B, and other keys (for example, keys belonging to the bass part L). May be a dedicated key without using the key base material 11W and the key base material 11B. That is, the other key may be formed by resin molding for each pitch assigned to the key.

  Moreover, in the said embodiment and its modification, 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 the above-described embodiment and the modification thereof, the key touch feeling at the front end of the key is gradually lightened from the bass part L to the treble part H. The key touch feeling at the front end may be the same, and the key touch feeling may be gradually reduced for each sound range as it goes 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, 11W, 11B ... key base material, 11W5, 11B5 ... first cutting part, 11W6, 11B6 ... second cutting part, 11W7, 11B7. .. 3rd cutting part, 11W8, 11B8 ... 4th cutting part, 12 ... Key frame, 12A ... Frame base material, 12A1 ... 1st cutting part, 12A2 ... 2nd cutting part , 13: Key support, FR: Frame

Claims (8)

A plurality of keys, each having a pitch assigned thereto, that are operated by a player to be pressed and released to swing around a swing center provided at the rear end;
In a keyboard device for an electronic musical instrument comprising a frame that supports the plurality of keys,
At least one key of the plurality of keys is a key base material formed by resin molding, and the key base material is commonly used for forming the at least one key and any other key. A keyboard device for an electronic musical instrument, wherein the keyboard is formed by removing an end portion. The keyboard device for an electronic musical instrument according to claim 1,
The key base has a plurality of cutting portions provided at intervals in the front-rear direction,
The at least one key is formed by cutting the key base material at a cutting portion corresponding to a pitch assigned to the at least one key among the plurality of cutting portions. Electronic musical instrument keyboard device. The keyboard device for an electronic musical instrument according to claim 2,
The key base has at least three of the cutting parts,
The keyboard device for an electronic musical instrument, wherein the plurality of cutting portions are provided at equal intervals. The keyboard device for an electronic musical instrument according to any one of claims 1 to 3,
A plurality of keys belonging to a predetermined range among the plurality of keys are formed by simultaneously cutting the plurality of key base materials at a predetermined angle with respect to the arrangement direction of the plurality of keys. Electronic musical instrument keyboard device. The keyboard device for an electronic musical instrument according to any one of claims 1 to 4,
A keyboard device for an electronic musical instrument, characterized in that the distance from the rocking center to the rear end of the key is the same for all the keys. The keyboard device for an electronic musical instrument according to any one of claims 1 to 4,
A keyboard device for an electronic musical instrument, wherein a longer key of the plurality of keys has a larger distance from the center of swing to the rear end of the key. The keyboard device for an electronic musical instrument according to any one of claims 1 to 6,
The frame is a frame base material common to the plurality of electronic musical instruments of different types, and the plurality of keys at a rear end portion of the frame base material provided with a plurality of support portions that respectively support the plurality of keys. A keyboard apparatus for an electronic musical instrument, wherein a region behind the rear ends of the plurality of keys when assembled to the plurality of support portions is removed. The keyboard device for an electronic musical instrument according to claim 7,
The support part has a plurality of support members arranged at intervals in the front-rear direction,
The key is supported by a support member corresponding to the length of the key among the plurality of support members,
A keyboard device for an electronic musical instrument, wherein the frame is formed by removing a region behind the support member corresponding to the key length in the frame base material.

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