JP2007052411A - Keyboard apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain sufficient equivalent mass even when the overall length of a mass member is made short, to obtain a desired touch feeling even when a turning angle during key depression is made large, and further to make a keyboard apparatus increase in neither depth nor height. <P>SOLUTION: The keyboard apparatus includes: keys 20 and 40 supported pivotably on a key mounting part 10K of a frame 10; mass members 50W and 50B pivotably supported on a mass member mounting part 10G and driven by mass member driving parts 29 and 45 provided underside of the keys 20 and 40; and a mass member lower limit stopper 84 and a mass member upper limit stopper 83 restricting a pivot range of the mass members. The mass members 50W and 50B include mass concentration parts 52Wc and 52Bc. The mass concentration parts extend more outward in a key longitudinal direction than a position where the mass member upper limit stopper 83 on the frame 10 is disposed, and upper faces of the mass concentration parts 52W and 52B at their highest lifted positions are substantially flush with upper faces of rear end portions of the keys 20 and 40. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a keyboard device used for an electronic keyboard instrument such as an electronic organ, an electronic piano, a synthesizer, or an electric keyboard instrument.

Conventionally, keyboard devices used for electronic keyboard instruments such as electronic organs and electronic pianos also support each key so that a touch feeling with a heavy feeling similar to the key touch feeling of a natural instrument such as a piano can be obtained. Some have a mass body generally called a hammer. The hammer swings in conjunction with the key pressing operation of each key, and a force corresponding to the movement is applied as a reaction against the key pressing force to obtain a desired key pressing touch feeling.
The hammer is generally formed of a metal material, and extends linearly from the pivot fulcrum to the rear of the key longitudinal direction. The mass is m, and the distance from the pivot fulcrum to the center of mass (center of gravity) is a. The inertia moment I has a relationship of I = ma ² , and this inertia moment I can increase the touch feeling at the time of key depression. Therefore, even if the mass m is the same, the feeling of mass (equivalent mass) received by the finger increases as the distance a is longer.

Therefore, if the hammer is provided so as to extend linearly, the mass distribution is uniform. Therefore, unless the total length of the hammer is increased, the distance from the mass and the rotation fulcrum to the center of gravity cannot be sufficient. Therefore, in order to obtain a desired touch feeling, it is necessary to increase the total length of the hammer, and there is a problem that the depth of the keyboard device increases.
Therefore, as disclosed in Patent Document 1, it is also known to form a mass concentration portion by bending a rear end portion of a hammer made of a rod-shaped metal material so as to be folded forward. In this way, the total length of the hammer can be shortened even if the mass is the same, and the equivalent mass can be increased by shifting the position of the center of gravity toward the rear end far from the pivot point. Accordingly, it is possible to obtain a desired touch feeling without increasing the depth of the keyboard device.
Japanese Patent No. 2917863

  However, in a keyboard device equipped with such a conventional hammer, when the hammer is rotated in conjunction with the key at the time of key depression, the mass concentration portion at the rear end portion is provided near the rear end of the frame as a support member. The upper limit of the rotation is regulated by abutting against the mass body upper limit stopper. Since the rod-shaped metal material is folded upward in the mass concentration portion, the vicinity of the rear end of the folded portion abuts on the mass body upper limit stopper, and the rotation is restricted. Therefore, a hammer is used to obtain a desired touch feeling. In order to obtain a sufficient rotation angle, the position of the mass body upper limit stopper must be made as high as possible.

  Then, since the rear end portion of the frame must be extended rearward and raised, there is a problem that the depth of the keyboard cannot be shortened so much and the height of the rear end portion becomes high. In addition, if the length of the bent portion of the mass concentrating portion is increased in order to increase the mass of the hammer, the position of the center of gravity moves in a direction approaching the rotation fulcrum. There is also a problem that the effect of improving the feeling is small.

  The present invention has been made to solve the above-described problems. In a keyboard device provided with a mass body (hammer), a sufficient equivalent mass can be obtained even if the overall length of the mass body is shortened. The purpose is to increase the turning angle at the time so that a desired touch feeling can be obtained, and the depth and height of the keyboard device do not increase.

The present invention includes a frame having a key attachment portion and a mass body attachment portion, a key composed of a white key and a black key rotatably held by the key attachment portion via a key rotation portion, A mass body that is driven by a drive unit provided on the lower surface side and is rotatably held by the mass body attachment unit via a mass body rotation unit, and a mass body lower limit stopper and a mass body that are provided on the frame To achieve the above object in a keyboard device that has an upper limit stopper, and the mass body lower limit stopper and mass body upper limit stopper limit the rotation range of the mass body when the key is driven and not driven. The configuration is as follows.
That is, the mass body includes a mass concentrating portion, the mass concentrating portion protrudes outward in the key longitudinal direction from the position where the mass body upper limit stopper of the frame is provided, and the rear end portion of the white key main body The upper surface and the upper surface at the highest rising position of the mass concentration portion are configured to be substantially flush with each other.

And a support member, a key that is swingably held with respect to the support member, and a drive unit that is swingably supported with respect to the support member below the key and provided below the key. In order to achieve the above object, a keyboard device having a mass body that is driven through and swings may be configured as follows.
That is, the mass body includes an inertia moment generating portion made of a rod-shaped metal warehouse material having a predetermined length, a driven portion driven by the driving portion, and a supported portion that is swingably supported. The driving force transmission unit is shorter than the fulcrum by a shorter moment than the inertia moment generation unit.
The inertia moment generating part is composed of a mass concentrating part and a continuous part connecting the mass concentrating part to the driving force transmitting part, and the mass concentrating part regulates the upper limit of the swing of the mass body. It has an upward extension projecting outward in the longitudinal direction of the key from the body upper limit stopper and extending upward along the swinging direction of the mass body.

In this keyboard device, the mass concentrating portion may have a parallel portion that is further bent from the upwardly extending portion toward the connecting portion. In this case, the shape of the side surface of the mass concentration portion can be various shapes such as a U-shape, a fishhook shape, a quadrangle, and a triangle.
Or the said mass concentration part may be formed by bending the said rod-shaped metal material in the circle | round | yen or circular arc shape in the perpendicular | vertical surface containing the said connection part. In this case, the side surface shape of the mass concentration portion includes a circular shape (loop shape), a semicircular shape, a U shape, a spiral shape, and the like. ,

Furthermore, a plurality of keys are swingably held with respect to the support member, and the mass body is provided for each of the plurality of keys, and a corresponding mass body is provided for each group of the keys or for each key. It is also possible to perform key scaling by varying at least one of the effective length (length when extended) or the shape of the mass concentration portion in FIG.
In this case, it is preferable that the equivalent mass of the mass body is larger as it corresponds to the bass key or key group, and smaller as it corresponds to the treble key or key group. Or you may make it the equivalent mass which is a mass feeling received by the finger | toe of the mass body corresponding to a white key become larger than the equivalent mass of the mass body corresponding to a black key.

  Alternatively, the mass concentrating portion of the mass body is provided on the opposite side of the driving portion via the corresponding portion of the mass rotating portion and at a position farther from the distance between the corresponding portion and the driving portion. The concentrated portion protrudes outward in the longitudinal direction of the key from the position where the mass body upper limit stopper of the frame is provided, and the upper surface of the mass concentrated portion is the white key (main body) upper surface and the frame. You may provide so that it may be located between the lower surfaces of the holding | maintenance part holding the said mass body upper limit stopper.

Alternatively, the mass concentrating part of the mass body is located on the opposite side of the driving part via the corresponding part of the mass rotating part, and is farthest from the distance between the corresponding part and the driving part. It may be provided at the outermost position, which is a position, and may have a rising portion that rises from the outermost position.
The rising portion is disposed so as to be located above the mass body upper limit stopper at the highest position of the mass body concentration portion and to have its upper end below the upper surface of the black key body.

  The keyboard device according to the present invention projects the mass concentrating portion of the mass body outward from the position where the mass body upper limit stopper of the frame or the support member is provided, so that the mass concentrating portion extends to the mass upper limit stopper and the upper surface of the key. As a result, it is possible to perform a free deformation process corresponding to the thickness of the material, and to increase the mass of the mass concentration portion. Thereby, while suppressing the total length of the mass body, it is possible to increase the moment of inertia by increasing the distance from the rotation center to the mass center (center of gravity) (increasing the equivalent mass). In addition, when the key is depressed, each mass body has a portion that does not extend above the rotation center from the mass concentrating portion abuts on the mass body upper limit stopper, and the upper limit position is restricted, so that the rotation angle is also increased. Therefore, it is possible to easily obtain a desired touch feeling by increasing the touch feeling of the key when the key is pressed.

  Moreover, the rear end of the mass body does not protrude upward from the upper surface of the key even at the highest position, the keyboard rear part can be flattened, the height can be lowered, and the total length of the mass body does not have to be lengthened. An increase in the depth of the keyboard device can also be suppressed. Therefore, the degree of freedom in mounting design is increased, and a small and high performance keyboard instrument can be provided.

If the mass concentrating portion is formed by bending a rod-shaped metal material upward in a vertical plane including a connecting portion that continuously connects the driving force transmitting portion and the mass concentrating portion, a portion extending in the key width direction is formed. Since there is no interference with the mass body of the adjacent key, the upper space can be utilized.
It is also possible to perform key scaling for key touch feeling by adjusting the moment of inertia for each key or key range.

Hereinafter, the best mode for carrying out the present invention will be specifically described with reference to the drawings.
FIG. 1 to FIG. 10 are views showing an embodiment of the present invention. FIG. 1 is a schematic cross-sectional view of the electronic musical instrument having the keyboard device according to the present invention along the longitudinal direction of the key, and FIG. 2 is one octave of the keyboard device. FIG. 3 is a front view seen from the direction of arrow S in FIG. 1, and FIG. 4 is a bottom view of the free end side of the white key.

FIG. 5 is a plan view showing only the key units constituting the keyboard device, with the white key unit indicated by a solid line and the black key unit indicated by a virtual line. FIG. 6 is an enlarged side view showing the vicinity of the key common holding portion of the key unit, and FIG. 7 shows the vicinity of the key attaching portion of the frame as a supporting member and a part of the first white key unit attached thereto. FIG. 8 is a perspective view of a part of the black key unit as viewed from below.
FIG. 9 is a plan view showing the keyboard device shown in FIG. 2 with the key unit and the switch board removed and a part thereof broken away, and FIG. 10 is a side view of the black key mass body drive unit.

First, the configuration of the electronic musical instrument shown mainly in FIG. 1 will be described. The electronic musical instrument 1 is an electronic keyboard instrument such as a desktop electronic organ, an electronic piano, or a synthesizer, and includes a keyboard device 2, an upper case 60, a lower case 70, an electronic circuit unit and a speaker (not shown). Yes.
The keyboard device 2 is provided with a large number of white keys 20 and black keys 40 attached to the key attachment portion 10K of the frame 10, and only the key body portion to be pressed is exposed, and the upper case 60 and the lower key 60 are exposed. A case 70 is housed in a case. The upper case 60 and the lower case 70 are fitted with each other, and are fastened together with the frame 10 that is a key support member by a set screw 71 and a plurality of set screws (not shown).
A mouth bar portion 64 is provided on the front surface of the upper case 60, and a music stand mounting groove 61 for inserting and mounting the music stand 62 is formed on the rear upper surface. Rubber feet 76 are attached to the four corners of the lower surface of the lower case 70.

Each of the white key 20 and the black key 40 constitutes a set of key units KU for each key range of one octave as shown in FIG. The key unit KU is composed of a first white key unit KUW1, a second white key unit KUW2, and a black key unit KUB.
The first white key unit KUW1 includes key body portions 23 of white keys 20 (C, E, G, and B keys shown in FIG. 2), which are four full-tone keys every other one octave from the outside. Each of the connecting parts 24 is connected to the key common holding part 21 so as to be rotatable in the pressing / releasing key direction.

In the second white key unit KUW2, each key body 23 of the white key 20 (D, F, and A keys shown in FIG. It is connected to the common holding part 22 so as to be rotatable in the direction of pressing and releasing keys.
The black key unit KUB is a key body of each of the black keys 40 (C #, D #, F #, G #, A # keys indicated by solid lines in FIG. 2) which are five semitone keys indicated by virtual lines in FIG. Each of the portions 43 is connected to the key common holding portion 41 by the connecting portion 42 so as to be rotatable in the key pressing direction.
In the key unit KU, the connecting portions 24 and 42 are key rotating portions, respectively.

In FIG. 5, reference numeral 23 denotes a key body portion of the white key 20, and 43 denotes a key body portion of the black key 40. The lengths of the key body portions 23 and 43 in the longitudinal direction are naturally white. The key body portion (hereinafter referred to as “white key body portion”) 23 of the key 20 is longer than the key body portion (hereinafter referred to as “black key body portion”) 43 of the black key 40.
Here, “white key” and “black key” do not necessarily mean “white key” and “black key”, but the upper surface of the key body is flat and long as described above. The key that is used to generate the whole sound when the key is pressed is the `` white key '', and the key that protrudes above the white key and has a shorter length. The keys are referred to as “black keys” for convenience. Therefore, even if the actual key is black and white, the key having the shape and function corresponding to the above-described white key is referred to as “white key”, and the key having the shape and function corresponding to the above-described black key is referred to as “black key”. Key.

  As shown in FIG. 6, the first white key unit KUW1, the second white key unit KUW2, and the black key unit KUB are shared by their key common holding units 21, 22, and 41 so as to overlap each other. The holding part 30 is formed. The key common holding part 30 is formed on the rail-shaped fitting protrusion 21b formed on the key common holding part 21 of the first white key unit KUW1, and is formed on the second white key unit KUW2 key common holding part 22. The fitting concave groove 22a is positioned and fitted, and the fitting concave formed on the key common holding portion 41 of the black key unit KUB is formed on the rail-like fitting protrusion 22b formed on the key common holding portion 22. The groove 41a is positioned and fitted to be integrated.

  Further, the fitting concave groove 21a formed in the key common holding portion 21 of the first white key unit KUW1 is positioned and fitted to the rail-like fitting protrusion 15 formed in the key mounting portion 10K of the frame 10. 1 is inserted into the mounting holes 44, 26, 26 of the key common holding portions 21, 22, 41 forming the key common holding portion 30 from above, and the key attachment shown in FIG. Each key common holding portion 21, 22, 41 is attached to the key attachment portion 10K in common by being screwed into the key common holding portion attachment screw hole 17 of the portion 10K.

  In this way, the first white key unit KUW1, the second white key unit KUW2, and the black key unit KUB are assembled on the frame 10 as a key unit KU for one octave as shown in FIG. By assembling the key units KU by connecting them in the key arrangement direction by the required key range, it is possible to configure a keyboard device having the required number of keys.

Here, details of the shapes of the connecting portions 24 of the first and second white key units KUW1 and KUW2 and the connecting portion 42 of the black key unit KUB will be described with reference to FIGS. 2 and 5 to 8. FIG.
As shown in FIGS. 2 and 8, the connecting portion 42 that connects each black key main body portion 43 of the black key unit KUB to the key common holding portion 41 so as to be swingable in the key-pressing direction is arranged as shown in FIGS. The overall width Wa in the direction is wider than the key width Wb of the black key body 40, and some of the portions Wc and Wd (see FIG. 8 for Wa, Wb, Wc, and Wd) overlap with the connecting portion 24 of the adjacent white key 20. The connecting portion 42 regulates the rocking in the key width direction when the black key 40 is pressed and released.

  As clearly shown in FIGS. 6 and 8, the connecting portion 42 of the black key 40 includes a thin-walled hinge portion 42b that enables the key to be pushed and released and a thick-walled connecting portion that is more rigid than the thin-walled hinge portion 42b. 42a, and the thick connecting portion 42a protrudes from both side surfaces of the rear end portion 43e (FIG. 8) of the black key main body portion 43 in the adjacent key direction, and extends rearwardly. It is connected to the unit 42 b and further coupled to the key common holding unit 41. The thin hinge portion 42b has an opening 47 in the middle in the key width direction as clearly shown in FIGS. 2 and 8, and is thus divided into left and right portions.

By forming the thin hinge portion 42b in this way, while increasing the flexibility in the key pressing direction, the cross-section secondary moment with respect to the force in the key width direction (lateral direction) is increased together with the thick connection portion 42a, and the key Even if the guide is not used, the lateral movement (yawing) of the black key body 43 in the key width direction can be sufficiently regulated.
The protruding amount of the thick connecting portion 42a from the both side surfaces of the rear end portion 43e of the black key main body 43 in the connecting portion 42 is different for each black key 40 as shown in FIG. The width is not necessarily different for each key. In any case, on the average, the wide portion as the black key connecting portion can have a width of 12/5 = 2.4 keys per key. Widely, the effect of restricting the lateral movement of the black key body 43 in the key width direction is enhanced.

  On the other hand, each connecting portion 24 for connecting the white key main body portion 23 of the first and second white key units KUW1 and KUW2 to the key common holding portion 21 or 22 so as to be swingable in the key pressing direction is shown in FIGS. 7, the full width We in the key arrangement direction is narrower than the full width Wa in the key arrangement direction of the connecting portion 42 of the black key unit KUB described above, and is almost equal to the width of the rear end portion of the white key main body 23. The width is formed.

As shown in FIG. 6, each connecting portion 24 includes a thin horizontal hinge portion 24 a extending in the key width direction and a vertical hinge portion 24 b extending in the thickness direction along the longitudinal direction of the key. As clearly shown in FIG. 5, 24 b is formed in a letter “e” shape when viewed from above. The front end portion of the thin horizontal hinge portion 24a is integrally connected to the rear end 43e of the white key body portion 23, and the rear end portion of the vertical hinge portion 24b is integrally connected to the key common holding portion 21 or 22. .
The horizontal hinge portion 24a supports the white key main body portion 23 so as to be swingable in the key pressing direction, and the vertical hinge portion 24b supports the white key main body portion 23 so as to be swingable in the key width direction. Therefore, positioning of the front end portion of the white key main body portion 23 in the key arrangement direction and regulation of rolling are performed by a guide portion described later provided on the free end side of the white key 20.

The reason for the presence of the vertical hinge portion 24b is that the keyboard frame 10 and the key unit KU are made of resin, so that the key guide portion 12 and / or the cover to be described later may be affected by shrinkage errors during molding and variations in each portion during thermal cooling. This is to prevent stress from being generated at the key free end when the key is pressed or released even if the position accuracy of the guide portion 33 may slightly vary.
As described above, the connecting portion 42 of the black key 40 has a full width in the key width direction that is wider than the key width at the rear end of the black key main body 43, and as shown in FIGS. The overlapping portion overlaps with the connecting portion 24 of the adjacent white key 20.

Further, as a part of the overlapping portion in the connecting portion 42, the portions protruding from both side surfaces of the rear end portion 43e of the black key main body portion 43 of the thick connection portion 42a in the adjacent key direction are adjacent white portions. The key 20 overlaps the upper surface of the rear end of the key body 23 of the key 20. Further, as shown in FIGS. 6 and 7, a relief portion 25 in which the height of the upper surface 23 a of the rear end portion of the white key main body portion 23 is set lower than the other portions is used as the rear end portion of the white key main body portion 23. Is formed. When the keyboard device is configured by superimposing the black key unit KUB on the first and second white key units KUW1, KUW2,
A thick-walled connecting portion 42a, which is a part of the connecting portion 42 of the black key 40, is fitted and overlapped with the escape portion 25 of the white key main body portion 23. In this embodiment, the upper surface 23a of the white key body 23 and the upper surface of the thick connection portion 42a of the connecting portion 42 of the black key 40 are thereby flush with each other.

With this configuration, in the keyboard device that does not need to provide a guide portion for at least the black key 40, the hinge mechanism by the connecting portions 24 and 42 of the white key 20 and the black key 40 are all white key main body 23. Therefore, the degree of freedom in mounting design (panel layout etc.) near the fulcrum of the key is improved while the height is held down. Furthermore, since the rotation fulcrum of the black key 40 and the white key 20 approaches in the vertical direction, a keyboard device that is easier to play is realized in terms of key operability. In particular, the scaling performance (for example, C, C ^# , D, D ^# , E, F,... By keys) is easy to operate.

In addition, the thickness of the white key main body 23 can be increased while suppressing the height of the keyboard device, and the white key main body 23 can be prevented from being bent when the key is depressed. Furthermore, by making the white key main body 23 longer, it becomes close to a parallel key press, so that it is easy to play.
On the other hand, the black key 40 can also have a sufficient thickness without increasing the thickness of the thick connecting portion 42a of the connecting portion 42. Therefore, it is possible to increase the rigidity against the lateral deflection in the key width direction.

Here, referring back to FIG. 1, the configuration of the frame 10 that is a support member and related portions will be described.
This frame 10 has a front lower portion located on the lower left side in FIG. 1, a rear lower portion located on the lower right side, an upper portion located on the upper side, and a rib portion that reinforces and connects them. It is integrally molded with resin.

  And in the front lower part, the guide support part 11 which formed the white key guide 12 integrally, the white key lower limit stopper holding part 10F, the key unit slide surface 19, the mass body attaching part 10G, and the lower case fixing Boss portions 10e to 10g are formed. A mass lower limit stopper holding portion 10L, a lower case fixing boss portion 10h, and the like are formed in the rear lower portion. Furthermore, a key attachment portion 10K, a switch board attachment portion 10S, a mass body upper limit stopper holding portion 10H, an upper component attachment portion 10J, and the like are formed in the upper portion.

  The key unit slide surface 19 is used when the above-described key unit KU is attached to the frame 10. That is, when the key unit KU is inserted from the front side of the frame 10 through the gap between the guide support part 11 and the switch board 80, the mass described later is a drive part provided for each of the white key 20 and the black key 40. The bottom driven surfaces 29a and 45 of the body drive units 29 and 45 are slid while abutting against the inclined surface of the key unit slide surface 19, and the main driven portions of the white key mass body 50W and the black key mass body 50B described later. The fitting parts of the mass body driving parts 29 and 45 can be automatically fitted between the 53W and 53B and the sub driven parts 54W and 54B.

Therefore, the upper and lower surfaces of the fitting parts 291 and 451 are fitted between the main driven parts 53W and 53B and the sub driven parts 54W and 54B. Power is transmitted between them.
Components such as an operation panel substrate housed in the upper part of the upper case 60 can be attached to the upper component attaching portion 10J.

  The rib portion includes a white key lower limit stopper holding portion 10F and a lower rib 10a of the key unit slide surface 19, an upper rib 10b of the boss portion 10f, an inner rib 10c of the mass body mounting portion 10G, and a lower front portion. It consists of a main rib 10d that connects the rear lower part and the upper part. As shown in FIG. 2, the rib portions formed of these ribs are provided at a plurality of places (about two places per octave) at intervals in the key arrangement direction along the key longitudinal direction.

  On the upper surface of the white key lower limit stopper holding portion 10F, a white key lower limit stopper 34 made of a belt-like felt material extending in the key arranging direction is adhered and held. On the upper surface of the mass body lower limit stopper holding portion 10L, as shown in FIGS. 2 and 9, the mass body lower limit made of a belt-like felt material extending in the direction in which mass bodies (hammers) 50W and 50B described later are arranged. A stopper 84 is stuck and held. Further, as shown in FIG. 7, a mass body upper limit stopper 83 made of a strip-like felt material extending in the direction in which the mass bodies 50W and 50B are arranged is adhered and held on the lower surface of the mass body upper limit stopper holding portion 10H. Yes.

Here, the guide part of the white key will be described with reference to FIGS.
At the upper part on the front end side of the frame 10, a plate-like guide support portion 11 is provided at a position corresponding to the vicinity of the free end of each white key, as shown in FIGS. It is lined up along. A plate-shaped white key guide 12 is vertically formed so as to protrude forward from the front surface of each guide support portion 11. The guide support part 11 and the white key guide 12 are T-shaped guide members as shown by broken lines in FIG. 2 and phantom lines in FIG. 4 when viewed from above or below.

  On the other hand, on the free end side of each white key 20, as shown in a bottom view of FIG. 4, the front end portion 20a of the white key main body portion 23 is outside the front end of the portion visible from the outside in a state of being housed in the case. A front end wall 31 is provided, and the upper surface portion slightly protrudes forward. An inner front end wall 32 is formed on the inner side of the outer front end wall 31 over the entire height region of the front end portion 20 a of the white key main body portion 23. A slit 33a is formed from the lower end along the key height direction at the intermediate portion in the key width direction of the inner front end wall 32, and a pair of guided portions 33 that protrude symmetrically forward from each other are formed. Yes. The gap width of the slit 33 a of the guided portion 33 is slightly larger than the thickness of the white key guide 12.

  When the above-described key unit KU is attached to the frame 10, as shown in FIGS. 2 to 4, each white key guide 12 is fitted into the slit 33a of the guided portion 33 of each white key 20, The position of the tip of each white key 20 is positioned and the lateral vibration during key depression is regulated. Note that. Since each white key main body 23 can swing in the key width direction by the action of the vertical hinge portion 24b of the connecting portion 24 described above, even if there is a slight manufacturing error or assembly error, each white key main body portion 23 can be comfortably provided. The arrangement positions of the keys can be aligned, and the key pressing operation can be performed smoothly. Lubricating grease may be applied to the respective white key guides 12 and the guided portions 33 of the respective white keys 20.

  Returning to FIG. 1 again, the switch board 80 is fixedly attached to the switch board attaching portion 10S of the frame 10 by the switch board engaging rod 35, and each white key is attached to the switch board 80. A large number of key switches 81 are arranged in rows as shown by broken lines in FIG.

  Each key switch 81 has a dome-shaped movable portion made of synthetic rubber, a pair of pressed portions (indicated by two broken small circles in FIG. 2) on the movable portion, and a conductive material on the inside thereof. A pair of movable contacts made of a synthetic rubber is provided, and each movable contact is opposed to two sets of fixed contacts formed on the switch substrate 80 to form a two-contact (two-make) key switch. When the white key 20 or the black key 40 is depressed, the movable portion is pressed on the lower surface thereof, and the pair of movable contacts sequentially come into contact with the two sets of fixed contacts to turn on the respective contacts. Is output. Further, the key pressing speed can be detected by the time difference between the timings when the respective contacts are turned on, and the musical sound generated according to the detected key pressing speed can be controlled.

Next, the keyboard device 2 is provided with a mass body (generally called a hammer) that interlocks with each key so that a heavy touch feeling can be obtained when each key is pressed. Will be described with reference to FIGS. 2, 9, and 10 in addition to FIG.
A white key mass body 50W for each white key 20 and a black key mass body 50B for each black key 40 are respectively passed through mass body rotating portions (rotating shafts 14W and 14B) described later. The mass 10 is attached to the mass body mounting portion 10G of the frame 10 so as to be rotatable (swingable) in the direction indicated by the arrow M in FIG.

  The white key mass body 50W and the black key mass body 50B have almost the same configuration, and the swing supported portion 51W or 51B, the main driven portion 53W or 53B, and the sub driven portion 54W or 54B are made of resin. Are integrally formed to form a driving force transmission portion. Then, the front end portion of the inertia moment generating portion 52W or 52B made of a rod-like metal material such as iron is integrated with the swing supported portion 51W or 51B by outsert molding.

  The rear end portions of the inertia moment generating portions 52W and 52B are bent upward at substantially right angles by bending to form an upward extending portion U extending upward along the swinging direction, and further returning to the front. A parallel portion P is formed by being bent at a substantially right angle to the connecting portion side described later, and a rear end portion of the inertia moment generation portion 52B of the black key mass body 50B forms a U-shaped mass concentration portion 52Bc. ing. The rear end portion of the inertia moment generating portion 52W of the white key mass body 50W is further bent downward at a substantially right angle to form a substantially rectangular loop-shaped mass concentrating portion 52Wc.

  The mass concentrating portions 52Wc and 52Bc protrude outward (backward) in the key longitudinal direction from the mass upper limit stopper holding portion 10H of the frame 10, and the inertia moment generating portions 52W and 52B are respectively the mass upper limit stopper 83. The upper surface of the white key 20 is substantially flush with the upper surface of the key main body 43 of the white key 20 or the upper surface of the thick connection portion 42a of the black key 40. The portions in front of the mass concentrating portions 52Wc and 52Bc in the inertia moment generating portions 52W and 52B serve as connecting portions that connect the mass concentrating portions 52Wc and 52Bc to the driving force transmitting portion described above.

  Each of the mass bodies 50W and 50B has a bearing portion (mass on the frame side) formed with a recess in the radial direction and a guide tongue piece Q protruding rearward from the lower side of the recess. Mass body rotating part corresponding parts) 13W and 13B corresponding to the body rotating part are provided. On the other hand, on the upper surface of the mass body mounting portion 10G of the frame 10, a pair of support ribs 10W and 10B facing each other at a predetermined interval in the key width direction are integrally formed in parallel with the key longitudinal direction as shown in FIG. Rotating shafts 14W and 14B which are mass body rotating portions are provided so as to stand and bridge between the pair of supporting ribs. As shown in FIG. 2, the mass body attaching portion 10G is formed with openings 38 and 48 through which the molds enter when the rotating shafts 14W and 14B are formed. In FIG. 1, the support ribs on the near side of the pair of support ribs 10W are removed.

Then, the rotating shafts 14W and 14B as the mass body rotating portions are fitted into the concave portions of the bearing portions 13W and 13B corresponding to the mass body rotating portion corresponding portions of the mass bodies 50W and 50B, whereby the white key mass body is inserted. 50W through the bearing portion 13W and the pivot shaft 14W and the pair of support ribs 10W, and the black key mass body 50B through the bearing portion 13B, the pivot shaft 14B and the pair of support ribs 10B, respectively. It is pivotally supported by 10G so as to be swingable.
As shown in FIGS. 2 and 9, the pivot position, that is, the position in the key longitudinal direction of the rotation shafts 14W and 14B is deviated, and the rotation shaft 14W with respect to the white key mass body 50W is the black key mass. It is closer to the front end than the pivot shaft 14B with respect to the body 50B.

  Further, as shown in FIG. 1, a main driven portion 53W and a sub driven portion 54W are provided at the front end portion of each white key mass body 50W with a swing supported portion 51W spaced apart in the vertical direction. The main driven portion 53W protrudes more forward than the sub driven portion 54W. On the other hand, a mass body drive unit 29 projects straightly downward as shown in FIG. 1 on the lower surface of the white key 20 near the rear end of the wide portion shown in FIG. The lower end surface of the mass body drive unit 29 comes into contact with the upper surface of the main driven portion 53W of the corresponding white key mass body 50W. Further, the lower portion of the mass body driving portion 29 is formed in a cavity having an open rear surface, and the front end portion of the sub driven portion 54W loosely enters there as shown by a broken line in FIG.

With this configuration, when the white key 20 is depressed, the mass body drive unit 29 is lowered to drive the main driven portion 53W, and the white key mass body 50W is used with the rotation shaft 14W as a fulcrum. In FIG. 1, the portion C of the inertia moment generating portion 52 </ b> W is rotated to the position indicated by the imaginary line in contact with the mass body upper limit stopper 83, so that a heavy touch feeling is given. When the key is released, the inner wall of the lower end of the mass body driving portion 29 engages with the sub driven portion 54W and raises it, so that the white key mass body 50W rotates clockwise in FIG. 1 with the rotating shaft 14W as a fulcrum. The mass concentration portion 52Wc quickly returns to the position indicated by the solid line in contact with the mass body lower limit stopper 84.
In this manner, the mass body drive unit 29 is moved to the main driven portion 53W and the sub driven portion 54W of the white key mass body 50W so that the white key 20 and the white key mass body 50W always rotate in conjunction with each other. It is made to engage with.

  Similarly, at the front end portion of each black key mass body 50B, a main driven portion 53B and a sub driven portion 54B indicated by phantom lines in FIG. 9), the main driven portion 53B protrudes more forward than the sub driven portion 54B. On the other hand, as shown in FIG. 10, each black key 40 has a mass body drive unit 45 projecting from the lower surface of the front end portion thereof. The mass body driving portion 45 extends in a crank shape downward, forward, and downward, and has a lower end surface 45a abutting against the upper surface of the main driven portion 53B of the corresponding black key mass body 50B. As indicated by phantom lines in FIG. 9, the direction position is aligned with the contact position between the lower end surface of the white key mass body drive unit 29 and the main driven portion 53W of the white key mass body 50W. .

The lower end portion of the mass body driving unit 45 is also formed in a cavity having an open rear surface, and the front end portion of the sub driven portion 54B enters into the space as shown by the phantom line in FIG.
As a result, as in the case of the white key 20 and the white key mass body 50W described above, the black key 40 and the black key mass body 50B always rotate in conjunction with each other.

  In this embodiment, as described above, the mass body drive unit 45 is extended to the near side below the white key 20, and the white key mass body by the mass body drive units 29, 45 of the white key 20 and the black key 40. The drive positions in the key longitudinal direction of 50W and the black key mass body 50B are aligned at substantially the same position. On the other hand, the positions of the rotation shafts 14W and 14B, which are the rotation fulcrums of the white key mass body 50W and the black key mass body 50B, are different (in a staggered arrangement).

Thereby, the mass body for white key 50W and the mass body for black key by each mass body drive part 29,45.
The distance from the point where .50B is driven to the rotation fulcrum is longer for the black key than for the white key, and from the rotation fulcrum of the inertia moment generator 52B of the black key mass 50B to the mass upper limit stopper 83 is shorter than the distance from the rotation fulcrum of the inertia moment generating portion 52W of the white key mass body 50W to the portion C abutting the mass body upper limit stopper 83. The key press feeling of the black key 40 can be balanced.

  Here, the white key mass body 50W and the black key mass body 50B in this embodiment also have the mass concentration portions 52Wc and 52Bc in the key longitudinal direction more than the mass body upper limit stopper holding portion 10H of the frame 10 as described above. It protrudes outward (backward), and the moment of inertia generating portions 52W and 52B are at their highest positions where they abut against the mass upper limit stopper 83, and the upper surface thereof is the upper surface of the key body 43 of the white key 20 or the black key 40. The reason why the upper surface of the thick connection portion 42a is substantially flush with the upper surface will be described.

  In a piano keyboard device with a mass body (hammer), it is important to balance the mounting space in order to realize a touch feeling of key pressing. In particular, the lower the price range, the greater the dimensional constraints of the instrument body and the greater the possibility that it will have to sacrifice the performance of the keyboard, so it is necessary to maximize the space efficiency among them. Become. By arranging the members that cannot be omitted at the minimum and other functional parts at the same height, it is possible to eliminate unnecessary space. It is particularly important that the unit height is almost determined by the amount of movement of the mass body (hammer).

Therefore, the mass concentrated portion of the mass body is moved out of the frame mass upper limit stopper holding portion of the frame in the key longitudinal direction, thereby improving the mass body's equivalent mass, reducing the weight, and reducing the cost simultaneously. It becomes possible to plan.
The mass feeling is proportional to the square of the distance from the rotation fulcrum of the mass body to the center of gravity, so it is desirable that the mass concentrating portion be as far as possible from the rotation fulcrum. For this reason, the mass concentration part is moved out of the frame, and the upper end of the mass concentration part becomes the same height as the highest point of the frame or key when it is rotated upward. And ensuring a high degree of freedom in mounting.

  Further, when the key is depressed, the mass body 50W or 50B has an abutting portion C of a continuous portion that does not extend above the center of rotation of the mass concentration portion 52Wc or 52Bc in the inertia moment generation portion 52W or 52B. Since the upper limit position is regulated by coming into contact with the stopper 83, the rotation angle can be increased even if the mass body upper limit stopper 83 is lower than the conventional position. In this respect as well, it is easy to obtain a desired touch feeling by increasing the touch feeling of the key at the time of pressing the key.

Therefore, the mass concentration portions 52Wc and 52Bc of the mass bodies 50W and 50B shown in FIG. 1 are mass body drive units via the bearing portions 13W and 13B corresponding to the mass body rotation portions (rotation shafts 14W and 14B). 29, 45, provided on the opposite side of the bearing parts 13 W, 13 B, which are the corresponding parts, and the mass body drive parts 29, 45.
The mass concentrating portions 52Wc and 52Bc are protruded outward in the key longitudinal direction from the position where the mass body upper limit stopper 83 of the frame 10 is provided, and the upper surface of the mass concentrating portions 52Wc and 52Bc at the most elevated position is white. It is provided so as to be positioned between the upper surface 23a of the key body 23 and the lower surface of the mass body upper limit stopper holding portion 10H that holds the mass body upper limit stopper 83 of the frame 10.

  Alternatively, the mass concentration portion 52Wc, 52Bc is provided at the outermost portion that is the farthest from the bearing portion 13W, 13B that is the corresponding portion, and has an upward extension portion U that is a rising portion that rises from the outermost portion. The rising portion is disposed so as to be positioned above the mass body upper limit stopper 83 at the highest position of the mass concentrating portions 52Wc and 52Bc, and so that the upper end is below the upper surface of the black key main body 43. May be.

  Further, in this embodiment, the mass concentrating portions 52Wc and 52Bc of the mass bodies 50W and 50B are formed by bending the rear end portion of the rod-shaped metal member upward in the key pressing / releasing key direction and further bending the connecting member side. As a result, the equivalent weight can be increased without increasing the total length of the mass bodies 50W and 50B, thereby increasing the moment of inertia and enhancing the touch feeling. Moreover, since the mass concentrating portions 52Wc and 52Bc are bent in a space (within the vertical plane including the connecting portion) parallel to the key release direction with the same width as the diameter of the rod-shaped metal member, The space above can be effectively used.

The bent shape of the mass concentrating portions 52Wc and 52Bc is not limited to a U shape or a square shape, but may be various shapes such as a U shape, a triangle, a circle, and a spiral shape. Specific examples thereof will be described later.
Further, in this embodiment, the mass concentrating portion 52Wc of the white key mass body 50W is formed by bending a rod-shaped metal material so that the side surface has a square shape as shown in FIG. Although the mass concentration portion 52Bc of the body 50B is difficult to understand in FIG. 1, it is formed by bending a rod-shaped metal material so that the side surface has a U-shape. In this way, the effective lengths (length when extended = weight) of the mass concentrating portions 52Wc and 52Bc of the white key mass body 50W and the black key mass body 50B are made different from each other. The touch feeling of the key 40 is made uniform.

  In the keyboard device 2 of this embodiment, as described with reference to FIG. 1, each part of the frame 10 is integrally formed by being supported by many ribs. And at least a part of the lower edge of the largest rib 10d among the ribs (in the example of FIG. 1, the intermediate part along the key longitudinal direction) is in the lowest lowered state indicated by the solid lines of the mass bodies 50W and 50B. Sometimes formed along the lower edge. By doing in this way, the space made in the lower part of the frame 10 can be used effectively. For example, functional components that are long in the key and mass body arrangement direction (key width direction) can be easily arranged.

In this case, the rotation fulcrum portion formed by the bearing portions 13W and 13B of the mass bodies 50W and 50B and the rotation shafts 14W and 14B on the mass body mounting portion 10G side is set to a predetermined height from the lowermost end of the frame 10 as a support member. A space outside the moving range is formed below the mass bodies 50W and 50B, and the uppermost part of the space is configured to coincide with a part of the lower edge of the rib 10d.
Furthermore, a concave portion that enters the space can be formed in the lower case 70 attached to the lower end of the frame 10, and the concave portion can be used as a functional member accommodating portion. In the example shown in FIG. 1, one of the recessed portions is a battery chamber 18 that houses a battery or a battery pack, and a lid 75 is detachably provided.

In this way, in the case of a portable electronic keyboard instrument, a necessary battery or a battery pack incorporating the battery is not provided with an extra space (without increasing the height of the keyboard device). ) Can be stored.
The other recessed portion is a functional component storage portion 16 that can store various functional components that are long in the key arrangement direction. A temporary holding member for fitting the frame 10 to the lower case 70 can be fitted into the functional component storage unit 16 or accessories such as a cord and a microphone can be stored.

The lower case 70 is screwed to the boss portions 10f, 10g, 10h of the frame 10 by set screws 72, 73, 74.
It is also possible to integrate the frame 10 and the lower case 70 so that the key unit and the mass body are supported by a part of the lower case.

Further, the lowermost end of the frame 10 that is a support member is provided in a distributed manner only at two or three locations on the lower surface of the frame 10. In the example shown in FIG. 1, only the lower surfaces of the boss portions 10f and 10h are the lowermost end of the frame 10, and the other portions are higher than the lowermost end. For example, the lower surface of the boss portion 10g is slightly higher than the lower surface of the boss portion 10f. When the lowest end is two places, at least one needs to have a certain length.
In this way, when the keyboard device 2 is directly placed on the shelf of the keyboard instrument without attaching the lower case 70, the keyboard device 2 can be stably placed without rattling.

Here, the features of the mass body in the keyboard device according to the present invention and examples of different shapes of the mass concentration portion will be described with reference to FIGS.
FIG. 11 and FIG. 12 are side views showing simplified examples in which the shape of the mass body of the keyboard device according to the present invention is different, and the symbols of the mass body are not distinguished for white keys and black keys, and are described above. Reference numerals excluding “W” and “B” in each figure are attached.

  In the example shown in FIG. 11, the white key 20 and the black key 40 are rotatably held by the frame 10 via the key rotation unit 5. Below each white key 20 and black key 40, a mass body (hammer) 50 is rotatably supported by a rotation shaft 14 provided on the frame 10 side. Each mass body 50 is indicated by an imaginary line from the position indicated by the solid line by the driven part 53 being driven by the mass body driving part 29 or 45 provided below when the white key 20 or the black key 40 is depressed. Rotate to position.

  Each mass body 50 includes an inertia moment generating portion 52 made of a rod-shaped metal material having a predetermined length, an oscillation supported portion 51 that supports the inertia moment generation portion 52, and a driven portion 53, and an oscillation fulcrum. From the moment of inertia generating portion 52 and the driving force transmitting portion. The inertia moment generating unit 52 includes a mass concentrating portion 52c and a connecting portion that connects the mass concentrating portion 52c to the driving force transmitting portion. The mass concentration portion 52c protrudes outward in the key longitudinal direction from the position where the mass body upper limit stopper 83 of the frame 10 is provided, and has a portion extending upward along the swinging direction. In the example shown in the figure, the end portion further has a portion bent toward the connecting portion side.

Each mass body 50 is rotated by a mass body lower limit stopper 84 provided at the lower portion of the frame 10 and a mass body upper limit stopper 83 provided at the upper portion when the white key 20 or the black key 40 is driven and when it is not driven. Is limited.
The upper surface of the white key 20 and the upper surface of the rear end portion of the black key 40 are configured to be substantially flush with the upper surface of each mass body 50 at the highest rising position of the mass concentration portion 52c.

  By configuring in this way, this keyboard device has a height corresponding to the thickness of the mass concentrating portion 52c of the mass body 50 up to the mass body upper limit stopper 83 and the upper surface of the white key 20 (the height indicated by the solid oval in FIG. 11). (Range) can be freely deformed, and the mass of the mass concentrating portion 52c can be increased. Thus, while suppressing the overall length of the mass body 50, the moment of inertia can be increased by increasing the distance from the rotation shaft 14 (rotation center) to the center of gravity as the center of mass (increasing the equivalent mass). In addition, when the key is depressed, each mass body 50 has its upper limit position regulated by a portion that does not extend above the center of rotation from the mass concentration portion 52c of the moment of inertia generating portion 52 abuts on the mass body upper limit stopper 83. The rotation angle also increases. Therefore, it is possible to easily obtain a desired touch feeling by increasing the touch feeling of the key when the key is pressed.

  Moreover, since the rear end portion of the mass body 50 does not protrude upward from the upper surfaces of the rear end portions of the white key 20 and the black key 40 even at the highest position, the rear portion of the keyboard can be flattened and the height can be reduced. Since it is not necessary to increase the overall length of the body, an increase in the depth of the keyboard device can be suppressed. Accordingly, the degree of freedom in mounting design in the region S in the upper rear part of the keyboard shown by the dashed line in FIG. 11 is increased, and a small and high performance keyboard instrument can be provided.

If the mass concentrating portion 52c is formed by bending upward in a vertical plane including the connecting portion of the inertia moment generating portion 52 made of a rod-shaped metal material, there is no portion extending in the key width direction. It is possible to eliminate the interference with the mass body 50 and utilize the space above.
The example shown in FIG. 12 is different from the example shown in FIG. 11 only in the shape of the mass concentration portion 52c of the mass body 50.
In this example, the mass concentrating portion 52c has an inverted U at the rear end portion of the inertia moment generating portion 52 made of a rod-shaped metal material of the mass body 50 in a space parallel to the swinging direction and having the same width as the rod diameter. It is bent into a letter shape and extends not only to the upper space but also to the lower space to increase the equivalent weight. Other configurations and operations are the same as the example described with reference to FIG.

FIG. 13 is a side view showing various shape examples of the mass concentration portion of the mass body. (A) is an L shape, (b) is a fishhook shape, (c) is a triangle, (d) is a quadrangle with one side overlapping, (e) is a circular loop, and (f) is a spiral. Is shown.
In this way, when the inertial moment generating part of the mass body is made of a rod-shaped metal material and the rear end part is bent to form a mass concentrated part, the number of bendings, the length of each bending part, the bending angle, the degree of curvature The number of spirals in the case of a spiral shape can be appropriately selected as necessary.
In addition, the inertial moment generating part having the mass concentrating part of the mass body is not limited to one formed by bending a rod-shaped metal material, but can also be produced by pressing a metal plate or casting a metal material. Can do.

  The present invention can be applied not only to an electronic keyboard instrument but also to an electric keyboard instrument using a natural sounding body and a keyboard instrument having other mass bodies. Needless to say, the shape and arrangement of each part are not limited to those of the embodiments, and can be appropriately changed according to the specifications of the applied instrument.

  The keyboard device according to the present invention can be applied to various keyboard instruments such as an electronic keyboard instrument such as an electronic organ, an electronic piano, and a synthesizer, or an electric keyboard instrument. In particular, it is suitable for application to a small electronic keyboard instrument having a mass body (hammer) for each key, has a good key touch feeling, and can provide a high-performance and compact electronic keyboard instrument at low cost. .

It is a schematic sectional drawing in alignment with the key longitudinal direction of the electronic musical instrument provided with the keyboard apparatus which is one Example of this invention. It is a top view of the key range part of 1 octave of the keyboard apparatus. It is the same front view. It is a bottom view of the free end side of the white key. It is a top view of only the key unit which shows the white key unit with a solid line, and shows a black key unit with a virtual line.

It is a side view which expands and shows the key common holding | maintenance part vicinity of the key unit. It is a perspective view which shows the key attachment part vicinity of the frame, and a part of 1st white key unit attached to there. It is the perspective view which looked at a part of black key unit from the bottom. FIG. 3 is a plan view showing the keyboard device shown in FIG. 2 with a key unit and a switch board removed and a part thereof broken away. It is a side view of the mass body drive part of a black key. It is a side view which simplifies and shows the Example from which the shape of the mass body of the keyboard apparatus by this invention differs. It is side sectional drawing which simplifies and shows the Example from which the shape of a mass body differs further similarly. It is sectional side view which shows the example of various shapes of the mass concentration part in the mass body of the keyboard apparatus by this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Electronic musical instrument, 2 ... Keyboard apparatus, 5 ... Key rotation part, 10 ... Frame (support member), 10W, 10B ... Pair support rib, 10F ... White key lower limit stopper holding part, 10G ... Mass body attaching part DESCRIPTION OF SYMBOLS 10K ... Key attachment part, 10H ... Mass body upper limit stopper holding part, 10L ... Mass body lower limit stopper holding part, 10J ... Upper part attachment part, 10S ... Switch board attachment part, 10a-10d ... Rib, 10e-10h ... Boss 11, guide support portion, 12, white key guide (guide portion), 13 W, bearing portion of white key mass body, 13 B, bearing portion of black key mass body, 14 W, rotation of white key mass body Shaft, 14B ... Rotating shaft of mass body for black key, 15 ... Fitting protrusion, 16 ... Functional part storage, 17 ... Screw hole for attaching key common holding part, 18 ... Battery chamber, 19 ... Key unit slide surface,

DESCRIPTION OF SYMBOLS 20 ... White key, 20a ... White key tip part, 21 ... White key key common holding part (bottom), 21a ... Fitting groove part, 21b ... Fitting protrusion, 22 ... White key key common holding part (Top), 22a ... concave groove portion for fitting, 22b ... protruding ridge portion, 23 ... white key main body portion, 23a ... upper surface of white key main body portion, 24 ... white key connecting portion, 24a ... horizontal hinge portion, 24b DESCRIPTION OF SYMBOLS ... Vertical hinge part, 25 ... Relief part, 26 ... Mounting hole, 29 ... White key mass body drive part, 30 ... Key common holding part (whole), 31 ... Outer front end wall of white key, 32 ... Inside of white key Front end wall 33 ... White key guided portion, 33a ... Slit, 34 ... White key lower limit stopper, 35 ... Switch board locking rod, 36, 37 ... Case coupling through hole, 38 ... White key mass body Bearing fitting hole,

40 ... Black key, 41 ... Black key common holding portion, 41a ... Fitting groove portion, 42 ... Black key connecting portion, 42a ... Thick connection portion, 42b ... Thin hinge portion, 43 ... Black key body portion 43e ... rear end of the black key body, 44 ... mounting hole, 45 ... black key mass drive unit, 46 ... case coupling through hole, 47 ... opening, 48 ... black key mass bearing fitting Hole, 50W ... Mass body for white key (hammer), 50B ... Mass body for black key (hammer), 51W, 51B ... Swing supported part of mass body, 52W, 52B ... Inertia moment generating part of mass body, 52Wc , 52Bc ... mass concentrating part of weight part, 53W, 53B ... main driven part of mass body, 54W, 54B ... sub driven part of mass body,

60 ... Upper case, 61 ... Music stand mounting groove, 62 ... Music stand, 64 ... Upper case mouth bar portion, 70 ... Lower case, 71-74 ... Set screw, 75 ... Battery compartment cover, 76 ... Rubber feet, 80 ... Switch board, 81 ... Key switch (with rubber movable part), 82 ... Key unit assembly screw,
83 ... Mass body upper limit stopper, 84 ... Mass body lower limit stopper KU ... Key unit, KUW1 ... First white key unit (C, E, G, B key),
KUW2 ... second white key unit (D, F, A key), KUB ... black key unit,

Claims (7)

A frame having a key attachment portion and a mass attachment portion; a key composed of a white key and a black key rotatably held by the key attachment portion via a key rotation portion; and provided below the key. A mass body that is driven by the drive unit and is rotatably held by the mass body attachment unit via a mass body rotation unit, and a mass body lower limit stopper and a mass body upper limit stopper provided on the frame. In the keyboard device in which the rotation range of the mass body at the time of driving and non-driving the key is limited by the mass body lower limit stopper and the mass body upper limit stopper portion,
The mass body includes a mass concentrating portion, the mass concentrating portion protrudes outward in the key longitudinal direction from a position where the mass body upper limit stopper of the frame is provided, and an upper surface of the rear end portion of the main body of the white key. A keyboard device, characterized in that the upper surface of the mass concentration portion at the highest position is substantially flush with the upper surface. Via a support member, a key that is swingably held with respect to the support member, and a drive unit that is swingably supported with respect to the support member below the key and provided below the key In a keyboard device comprising a mass body that is driven to swing,
The mass body includes a moment of inertia generating portion made of a rod-shaped metal material having a predetermined length, a driven portion driven by the driving portion, and a supported portion that is swingably supported. It consists of a driving force transmission part whose length is shorter than the inertia moment generation part,
The moment of inertia generating part comprises a mass concentrating part and a continuous part connecting the mass concentrating part to the driving force transmitting part,
The mass concentrating portion has an upper extension portion that protrudes outward in the longitudinal direction of the key from the mass body upper limit stopper that regulates the upper limit of swinging of the mass body, and extends upward in the swinging direction. A keyboard device characterized by that.   The keyboard apparatus according to claim 2, wherein the mass concentrating part has a parallel part that is further bent from the upper extension part to the connecting part side.   3. The keyboard apparatus according to claim 2, wherein the mass concentrating portion is formed by bending the rod-shaped metal material into a circle or an arc in a vertical plane including the connecting portion. Keyboard device. The keyboard apparatus according to claim 2, wherein a plurality of keys are swingably held with respect to the support member, and the mass body is provided for each of the plurality of keys.
A keyboard device, wherein at least one of an effective length or a shape of the mass concentrating portion in the mass body corresponding to each group of the plurality of keys or each key is made different. A frame having a key attachment portion and a mass attachment portion;
A key composed of a white key and a black key rotatably held by the key attachment portion via a key rotation portion;
A mass body that is driven by a drive unit provided below the key and is rotatably held by the mass body attachment unit via a mass body rotation unit;
A mass body lower limit stopper and a mass body upper limit stopper provided on the frame;
In the keyboard device in which the mass body lower limit stopper and the mass body upper limit stopper limit the rotation range of the mass body when the key is driven and not driven,
The mass body is provided on the opposite side of the driving unit via the corresponding part of the mass body rotating unit, and includes a mass concentrating unit provided at a position farther from the distance between the corresponding unit and the driving unit,
Projecting the mass concentrating part outward in the longitudinal direction of the key from the position where the mass body upper limit stopper of the frame is provided;
The mass concentrating portion is provided so that the upper surface at the highest position is located between the upper surface of the white key main body and the lower surface of the holding portion for holding the mass body upper limit stopper of the frame. A keyboard device. A frame having a key attachment portion and a mass attachment portion;
A key composed of a white key and a black key rotatably held by the key attachment portion via a key rotation portion;
A mass body that is driven by a drive unit provided below the key and is rotatably held by the mass body attachment unit via a mass body rotation unit;
A mass body lower limit stopper and a mass body upper limit stopper provided on the frame;
In the keyboard device in which the mass body lower limit stopper and the mass body upper limit stopper limit the rotation range of the mass body when the key is driven and not driven,
The mass body includes a mass concentrating portion, and the mass concentrating portion is farther from the distance between the corresponding portion and the driving portion on the opposite side of the driving portion via the corresponding portion of the mass body rotating portion, Provided at the outermost part that is the farthest from the corresponding part, and has a rising part that rises from the outermost part,
The rising portion is located above the mass body upper limit stopper at the highest rising position of the mass concentrating portion, and is arranged so that its upper end is below the upper surface of the main body of the black key. Keyboard device.

Images