JP4947155B2 - Keyboard device - Google Patents

Description

  The present invention relates to a keyboard device including a rotating member that rotates in response to an operation for pressing a key.

  In the keyboard device, if it is a parallel keyboard, it is easy to make the strokes of the white key and the black key and the weight of the touch uniform. However, in a keyboard device that is configured so that the key rotates in the vertical direction around the key fulcrum part, the distance between the key-pressed part and the key fulcrum part is more black than the white key. Since the key is shorter, unless specially devised, the black key is less likely to secure a key pressing stroke and the touch tends to be heavier.

  Therefore, a keyboard device is known in which the key fulcrum part of the black key is positioned behind the key fulcrum part of the white key so that the touch feeling of the white key and the black key is balanced as much as possible (the following patent document). 1).

  On the other hand, a keyboard device is also known in which a mass body for applying an appropriate inertial force to a key to be pressed is disposed on a key frame or the like so as to be rotatable around a rotation fulcrum portion. . In this type of keyboard device, in general, when a key is depressed, a driven portion of the mass body is driven by the key driving portion, and the mass body rotates in conjunction with the key.

  In the keyboard device provided with this type of mass body, for example, the position of the pivot fulcrum portion in the front-rear direction is common to all mass bodies corresponding to the white key / black key, while the front-rear direction of the driven portion In this position, the driven portion of the black key mass body is positioned in front of the driven portion of the white key mass body. In other words, the principle of lever ratio is used to appropriately secure the keystroke stroke of the black key and to balance the touch feeling with the white key as much as possible.

Japanese Patent Publication No. 60-52439

  However, as described above, since the driven part of the black key mass body is located in front of the driven part of the white key mass body, the black key mass body becomes longer, There has been a problem that the space in the depth direction of the portion where the mass body is disposed in the keyboard device is compressed.

  By the way, in the keyboard device, there are various types of rotation fulcrum portions that rotatably support a rotation member (a key, a mass body, etc.) that rotates according to an operation for pressing a key. In particular, a pivot fulcrum portion may be provided on a rib extending along the vertical direction and the front-rear direction from the key frame, and the rib is formed by a resin key frame by injection molding with a mold. Some are integrally formed.

  In this case, since the ribs corresponding to the adjacent keys are extremely close to each other and are thin plate-shaped, it is necessary to reduce the thickness of the protruding piece or the like for forming the rib in the mold shape. Therefore, there was a problem that the mold strength was lowered.

  The present invention has been made to solve the above-mentioned problems of the prior art, and its purpose is to ensure a good balance of touch feeling between the white key and the black key, to make the depth direction compact, An object of the present invention is to provide a keyboard device that can easily realize key scaling of touch weight.

  In order to achieve the above object, a keyboard apparatus according to claim 1 of the present invention includes a support member and a drive unit, and a plurality of white keys disposed on the support member so as to be rotatable at a base end portion. And a plurality of keys composed of a plurality of black keys, a plurality of rotation fulcrum portions fixedly provided on the support member, each of which is immovable, and a plurality of rotation fulcrum portions that are assembled to correspond to the plurality of rotation fulcrum portions. The rotating fulcrum portion has a driven portion that engages the driving portion of the key on one end side and a mass portion on the other end side, and is rotatable about the corresponding rotating fulcrum portion. And a plurality of mass bodies composed of white key corresponding mass bodies corresponding to the respective white keys and black key corresponding mass bodies corresponding to the respective black keys, according to the rotation of the respective keys. The corresponding mass body driven portion is driven by the drive portion of each key, and the corresponding mass body corresponds to the rotation fulcrum. The keyboard device is configured to rotate around the center of the plurality of white key corresponding mass bodies and the plurality of black key corresponding mass bodies. In the relationship between the black key corresponding mass body and the white key corresponding mass body that are located closer to the other end side and closer to the other end side, the driven portion and the rotation in the black key corresponding mass body The distance between the fulcrum part is longer than the distance between the driven part and the rotation fulcrum part in the white key corresponding mass body, and in the relationship between the black key corresponding mass body and the white key corresponding mass body adjacent to each other, The rotation fulcrum portion corresponding to the black key corresponding mass body is located closer to the other end side with respect to the rotation fulcrum portion corresponding to the white key corresponding mass body, and the plurality of white keys For each of the corresponding mass body and the plurality of black key corresponding mass bodies , The position of the pivot point of each mass body, the more the mass of treble side, characterized in that located in the more the other end closer.

  According to the present invention, it is possible to ensure a good balance of touch feeling between the white key and the black key, to make the depth direction compact, and to easily realize key scaling of the weight of the touch.

It is a longitudinal cross-sectional view of the keyboard apparatus based on the 1st Embodiment of this invention. It is sectional drawing of the front half part of a white key. It is a side view (partial sectional view) of the front half of the black key. It is a fragmentary top view which shows the state by which the mass body was assembled | attached to the key frame. It is sectional drawing of the front half part of a key frame. It is a schematic diagram (a figure (a)) which shows rotation operation of a black key and a mass body, and a schematic diagram (a figure (b)) which shows rotation operation of a white key and a mass body. It is a fragmentary top view which shows typically the state by which the mass body was assembled | attached to the key frame in the keyboard apparatus which concerns on the 2nd Embodiment of this invention. It is the side view (figure (a)) which shows typically the state where the mass body was assembled | attached to the key frame, and the rear view (figure (b)) which shows the same state typically.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(First embodiment)
FIG. 1 is a longitudinal sectional view of a keyboard device according to a first embodiment of the present invention. The keyboard device 1 is configured as an electronic keyboard instrument. Hereinafter, the player side (the left side of the figure) of the keyboard device 1 is referred to as the front.

  As shown in FIG. 1, in the keyboard device 1, a key frame 10 is disposed in a housing constituted by an upper case 60 and a lower case 70. The key frame 10 is provided with a plurality of key units KU including a plurality of white keys 20 and a plurality of black keys 40. The common base end 30 of each key unit KU is fixedly held by the key frame 10, and the free ends of the white key 20 and the black key 40 are rotatable (or swingable) in the vertical direction. .

  The key frame 10 is coupled to the lower case 70 with a plurality of screws 72, 73 and 74. In addition, the lower case 70, the upper case 60, and the key frame 10 are coupled together by a plurality of screws 71 at the front portions thereof. Further, the lower case 70 and the upper case 60 are coupled with a plurality of screws (not shown) at appropriate positions in the respective rear portions. A recess 18 for accommodating a battery or the like is formed in the lower portion of the lower case 70.

  Hereinafter, among the constituent elements of the keyboard device 1, those corresponding to the white key 20 and the black key 40 and the same type may be used for the same type, but corresponding to the white key 20 and the black key 40. When it is necessary to distinguish what is to be performed, “W” and “B” are respectively added after the symbol.

  The key frame 10 is provided with mass bodies 50 (50W, 50B) corresponding to the white key 20 and the black key 40, respectively. Each mass body 50W, 50B is a rotating shaft 14 (14W) provided on a mass body support rib 13 (13W, 13B; will be described later in FIGS. 4 and 5) formed on the key frame 10 at each bearing portion 51. 14B, which will be described later with reference to FIGS. Most of the masses of the mass bodies 50W and 50B are concentrated on the rear end portions 52 (52W and 52B) of the mass bodies 50W and 50B. The mass body 50 rotates in conjunction with the corresponding key, and rotates to give an appropriate inertial force to the corresponding key, thereby realizing a touch feeling like an acoustic piano.

  In the rear part of the key frame 10, an upper limit stopper 83 is provided on the upper side, and a lower limit stopper 84 is provided on the lower side. These upper limit stopper 83 and lower limit stopper 84 may be provided corresponding to each key, but in the present embodiment, they are provided in common for a plurality of keys (for example, all keys or all keys in one key unit KU). It is done. When the rear end portion 52 of the mass body 50 abuts on the lower limit stopper 84, the non-key-pressing position (initial position) of the mass body 50 and the corresponding key is regulated. On the other hand, when the rear end portion 52 of the mass body 50 abuts on the upper limit stopper 83, the pressing end position (rotation end position) of the mass body 50 and the key corresponding thereto is regulated.

  Further, on the substrate 80 provided on the key frame 10, key pressing switches 81 are provided corresponding to the white key 20 and the black key 40, respectively, and these key pressing switches 81 perform the pressing operation of the corresponding key. To detect. A musical sound is generated by a musical sound generator (not shown) based on the detection result by the key pressing switch 81.

  Further, a key guide portion 12 for guiding a key pressing operation is provided at the front portion of the key frame 10 corresponding to each white key 20. A keyed guide portion 33 (see FIG. 2) that engages with the key guide portion 12 is formed at the front end portion 20a of the white key 20, and the front end portion 20a of the white key 20 is moved in the left-right direction by the engagement of both. Movement is restricted, and it operates properly in the vertical direction.

  Although not shown in detail, one key unit KU is formed by laminating two white key units and one black key unit at their base ends. For example, one key unit KU is configured in units of one octave, but is not limited thereto. In the key unit KU, each white key 20 is configured by connecting a white key body to a common base end portion 30 via a thin plate-like vertical hinge portion 24 and a horizontal hinge 22. The black key 40 is configured by connecting a black key body to a common base end 30 via a thin plate-like horizontal hinge 42. The common base end portion 30 is fastened and fixed to the key frame 10 with screws 82.

  The vertical hinge portion 24 allows the free end portion of the white key 20 to swing in the key arrangement direction (left-right direction), but the white key 20 is engaged by the engagement of the key guide portion 12 and the keyed guide portion 33. The position of the free end is properly regulated. Further, since the horizontal hinge 22 bends in the vertical direction, the free end portion of the white key 20 can be freely rotated in the pressed / released key direction (vertical direction). Further, the horizontal hinge 42 is bent in the vertical direction in the same manner as the horizontal hinge 22, so that the free end portion of the black key 40 can be rotated in the pressing / releasing key direction. Strictly speaking, the positions at which the white key 20 and the black key 40 become pivot points are the connection point PW between the vertical hinge portion 24 and the horizontal hinge 22, and the connection point PB between the common base end portion 30 and the horizontal hinge 42, respectively. (See FIG. 6). Further, the respective center portions of the horizontal hinge 22 and the horizontal hinge portion 42 in the front-rear direction are the substantial rotation centers of the white key 20 and the black key 40.

  FIG. 2 is a cross-sectional view of the front half of the white key 20. FIG. 3 is a side view (partially sectional view) of the front half of the black key 40. FIG. 4 is a partial plan view showing a state in which the mass body 50 is assembled to the key frame 10. FIG. 5 is a cross-sectional view of the front half of the key frame 10.

  As shown in FIGS. 4 and 5, the mass support rib 13 is formed on the key frame 10. The key frame 10 is made of resin and is injection-molded with a mold. The mass support ribs 13 are formed integrally with the key frame 10 on the upper surface of the key frame 10 and extend in a thin plate shape along the front-rear direction and the vertical direction. A pair of mass body support ribs 13 </ b> W and 13 </ b> B are provided corresponding to the white key 20 and the black key 40, respectively. All of the mass body support ribs 13W and all of the mass body support ribs 13B are provided at the same position in the front-rear direction. The mass body support rib 13B is located behind the mass body support rib 13W, and there are few overlapping portions of the mass body support rib 13W and the mass body support rib 13B in the front-rear direction.

  The rotating shaft 14W and the rotating shaft 14B are suspended between the pair of mass body support ribs 13W and between the pair of mass body support ribs 13B, respectively. The rotating shaft 14B is located behind the rotating shaft 14W, and they do not overlap in the front-rear direction.

  As shown in FIGS. 4 and 5, the key guide portion 12 extending in the vertical direction is integrally formed at the foremost portion of the key frame 10 corresponding to each white key 20. On the other hand, as shown in FIG. 2, the keyed guide portion 33 is formed at the front end portion 20 a of the white key 20.

  As shown in FIGS. 1 and 5, the bearing portion 51 (51W, 51B; 51B is not shown) of the mass body 50 is open at the rear. By fitting the bearing portion 51 to the rotating shaft 14 from the opened side, the mass bodies 50W and 50B rotate around the rotating shaft 14W and the rotating shaft 14B, respectively, as shown in FIG. Become free. In the free state in which the mass body 50 is rotatably disposed on the rotational shaft 14 (the state where the key is not yet disposed), the rear end portion 52 becomes the lower limit stopper 84 (see FIG. 1) due to its own weight. The front end portion is located above and the rear end portion 52 is located below.

  A tongue piece 56 (56W, 56B) is extended from the lower side of the bearing portion 51 of the mass body 50 toward the rear. The tongue piece 56 is made of soft resin or the like and has flexibility. When the bearing portion 51 is fitted to the rotating shaft 14, the tongue piece 56 performs a guide function. Moreover, the opening part of the bearing part 51 is thinner in the vicinity of the base of the tongue piece 56 than in the vicinity of the tip end of the tongue piece 56, and the rotating shaft 14 fitted to the bearing part 51 is difficult to come off. .

  As shown in FIGS. 2, 3, and 4, lower engagement pieces 53 </ b> W and 53 </ b> B, which are driven parts driven by the white key 20 and the black key 40, are respectively attached to the front ends of the mass bodies 50 </ b> W and 50 </ b> B. And upper engagement pieces 54W and 54B, and recessed portions 55W and 55B to be fitted are formed between the upper engagement pieces 54W and 54B and the lower engagement pieces 53W and 53B, respectively (FIG. 2). FIG. 3).

  Here, the positional relationship in the front-rear direction and the vertical direction is the same for the upper engagement piece 54W and the upper engagement piece 54B, and the same for the lower engagement piece 53W and the lower engagement piece 53B. Since the rotation shaft 14B is shifted rearward from the rotation shaft 14W, the distance between the lower engagement piece 53B and the rotation shaft 14B is the distance between the lower engagement piece 53W and the rotation shaft 14W. (See FIG. 4). As a result, when considering the independent rotation of the mass bodies 50 having the same mass of the rear end portion 52, the lower engagement pieces 53W and 53B are driven more than the mass body 50W because of the lever ratio. The mass body 50B rotates with a weaker driving force.

  As shown in FIG. 2, a driving hanging piece 29 is suspended and integrally provided at the lower part of the front half of the white key 20. An elastic member 31W such as rubber is fixed to the lower end portion of the drive hanging piece 29, and this elastic member 31W (the lower end thereof) functions as a drive unit that directly drives the corresponding mass body 50W. In other words, after the key unit KU is properly assembled to the key frame 10, the elastic member 31W is positioned between the lower engagement piece 53W and the upper engagement piece 54W in the fitted recess 55W of the mass body 50W. The lower engagement piece 53W is always in contact with the upper surface 53Wa of the lower engagement piece 53W and the lower surface 54Wa of the upper engagement piece 54W.

  For example, when the white key 20 is pressed, the elastic member 31W of the driving hanging piece 29 of the white key 20 drives the upper surface 53Wa of the lower engagement piece 53W of the corresponding mass body 50W, and the mass body 50W rotates in conjunction with the white key 20 in the key pressing direction (the direction in which the front end of the mass body 50W moves downward). On the other hand, when the key is released, the mass body 50W is released together with the white key 20 by the weight of the mass body 50W and the restoring force due to the elasticity of the horizontal hinge 22 of the white key 20. It rotates in conjunction with the upward movement direction. Therefore, in the performance operation, the white key 20 and the mass body 50W always rotate in conjunction with each other.

  The configuration of the front end portion of the mass body 50B and the engagement relationship between the black key 40 and the mass body 50B are the same as those of the white key 20 to the mass body 50W. That is, as shown in FIG. 3, a driving hanging piece 45 is suspended and integrally provided at the lower part of the front half of the black key 40 (see also FIG. 1). The elastic member 31B fixed to the lower end portion of the driving hanging piece 45 is engaged between the lower engaging piece 53B and the upper engaging piece 54B in the fitted recess 55B of the mass body 50B, and the lower side The upper surface 53Ba of the engagement piece 53B and the lower surface 54Ba of the upper engagement piece 54B are always in contact with each other. The actions and operations between the black key 40 and the mass body 50B during performance are the same as those of the white key 20 to the mass body 50W.

  In such a configuration, the mass body 50 and the key unit KU are assembled to the key frame 10 as follows. First, the bearing portion 51 of the mass body 50 is fitted to the corresponding rotation shaft 14 from the front with respect to the key frame 10. The whole mass body 50 is assembled in the same manner.

  On the other hand, the required number of key units KU (for one octave) are separately configured. Then, the key unit KU is moved from the front to the rear, and all the elastic members 31 in the key unit KU are simultaneously applied to the lower engagement pieces 53 (the upper surfaces 53Wa and 53Ba) of the corresponding mass bodies 50. Make contact. Then, the key unit KU is further moved rearward so that all the elastic members 31 are fitted together between the lower engagement piece 53 and the upper engagement piece 54 (the fitted recessed portion 55) of the mass body 50. Engage in the combined state (see FIGS. 2 and 3).

  On the other hand, in parallel with the engagement of the elastic member 31 with the fitted recess 55, the keyed guide portion 33 of the white key 20 in the key unit KU naturally moves to the corresponding key guide portion 12 of the key frame 10. Engage. Thereafter, the common base end 30 of the key unit KU is fastened to the key frame 10 with screws 82 (see FIG. 1). The other key units KU are assembled in the same manner.

  In the keyboard device 1 after completion, the rotation ranges of the white key 20, the black key 40, and the mass bodies 50W and 50B are as follows. FIG. 6A is a schematic diagram illustrating the rotation operation of the black key 40 and the mass body 50B, and FIG. 6B is a schematic diagram illustrating the rotation operation of the white key 20 and the mass body 50W.

  First, as described above, the front and rear positions of the lower engagement piece 53W and the lower engagement piece 53B are the same. The total lengths of the mass bodies 50W and 50B are set to be the same, and the positions of the rear end portions 52W and 52B of the mass bodies 50W and 50B are also the same. However, as described above, the positions of the rotation shafts 14W and 14B are different, and the rotation shaft 14B is located behind the rotation shaft 14W. Incidentally, the positions of the connection point PW and the connection point PB are also different, and the connection point PB is located slightly rearward.

  In such a positional relationship, when the rotation range of the mass bodies 50W and 50B is restricted by the upper limit stopper 83 and the lower limit stopper 84, the stroke which is the vertical movable amount of each part below is as follows. become. First, the vertical movement strokes of the rear end portions 52W and 52B are stW3 and stB3, the vertical movement strokes of the lower engagement piece 53W and the lower engagement piece 53B are stW2 and stB2, and the white key 20 In addition, the vertical movement strokes (key pressing strokes) in the area where the black key 40 is pressed frequently are set to stW1 and stB1. The relationship between the strokes is stW3 = stB3, stW2 <stB2, and stW1 = stB1.

  Here, when discussing stW3 and stB3, it is assumed that the rear end portions 52W and 52B, which are free ends, are rear portions of the contact portion with the upper limit stopper 83 and the lower limit stopper 84 and the corresponding contact portion. Strictly speaking, stW3 and stB3 are vertical movement strokes of a predetermined portion (predetermined point) in the rear end portions 52W and 52B. Alternatively, stW3 and stB3 may be vertical distances between the contact portion of the rear end portions 52W and 52B with respect to the upper limit stopper 83 and the contact portion of the rear end portions 52W and 52B with respect to the lower limit stopper 84.

  Since stW1 = stB1, the key pressing stroke is the same and balanced between the white key 20 and the black key 40. In addition, since stW3 = stB3, the weight of the touch when pressing the key is balanced. The position in the front-rear direction of the region that is frequently pressed is different between the white key 20 and the black key 40, but the rotation shaft 14B is positioned behind the rotation shaft 14W, and By setting the distance between the lower engagement piece 53 and the rotating shaft 14 longer for the one corresponding to the black key 40, it is possible to appropriately balance the touch feeling (stroke and touch weight). It has become.

  According to the present embodiment, a good balance of touch feeling between the white key 20 and the black key 40 can be ensured, the key pressing strokes can be matched, and the rear end 52 of the mass body 50 can be obtained. Since the movement strokes stW3 and stB3 are the same and the balance of the weight of the touch is obtained, the touch feeling can be matched between the white key 20 and the black key 40. In addition, since the entire lengths of the mass bodies 50W and 50B are the same, and the front end position (the lower engagement pieces 53W and 53B) and the rear end position (the rear end portions 52W and 52B) respectively match, Compared to the configuration in which the touch feeling is balanced by changing the overall length of the mass body 50 between the white key and the black key, the space in the depth direction of the portion where the mass body 50 is disposed inside the keyboard device. Waste is unlikely to occur. Therefore, the depth direction of the keyboard device can be made compact.

  Also according to the present embodiment, the mass body support rib 13B is located behind the mass body support rib 13W, and there are few overlap portions in the front-rear direction (see FIGS. 4 and 5). A mold for injection-molding the mass support ribs 13 integrally with the key frame 10 must be provided with a thin protrusion corresponding to the mass support ribs 13W and 13B adjacent to each other. If the mass support ribs 13W and 13B overlap in many areas, the range of the thin protruding pieces increases and the mold strength decreases. Since the mass support ribs 13W and 13B are often adjacent due to the key arrangement, by reducing the overlap portion as described above, the range of the thin protruding piece in the mold can be reduced. The mold strength can be improved. By the way, since each of the mass support ribs 13 does not include three or more mass support ribs 13W or three mass support ribs 13B, the position in the front-rear direction with the mass support ribs 13 adjacent to at least one of the left and right sides. Are always different. Therefore, the effect of improving the strength can be obtained with respect to the mold part for molding both mass support ribs 13 having different positions.

  In addition, the rotation shaft 14B is located behind the rotation shaft 14W, and the two do not overlap in the front-rear direction, so that it is easy to avoid interference between the rotation shafts 14 in the left-right direction. The degree of freedom in designing the moving shaft 14 can be improved. That is, in general, it is no exaggeration to say that the rotation fulcrum of the mass body or the like that rotates in response to the key pressing operation, as exemplified by the rotation shaft 14, receives all of the force that acts during the performance operation. High strength and durability are required, and the size tends to increase naturally. On the other hand, in the present embodiment, when viewed from each rotation shaft 14, the position in the front-rear direction of the rotation shaft 14 adjacent to at least one of the left and right sides is always different. Since a space is generated, a design in which the fulcrum mechanism protrudes to the side can be employed. Therefore, the degree of freedom in design is improved.

  From the viewpoint of ensuring an appropriate balance of touch feeling between the white key 20 and the black key 40, the position of the lower engagement piece 53 in the front-rear direction, the lower engagement piece 53 and the rotary shaft 14 The distance corresponding to the white key 20 and the distance corresponding to the black key 40 do not necessarily have to be completely the same, and may be approximately the same. The movement strokes stW3 and stB3 and the key pressing strokes stW1 and stB1 may not be completely the same.

  From the viewpoint of improving the mold strength, the rotation member that is pivotally supported by the rotation fulcrum such as the rotation shaft 14 is not limited to the mass body 50. That is, any rotation member that rotates about the rotation fulcrum portion in accordance with the operation for pressing the key may be used. In addition to the key itself, the rotation member is interposed between the key and the mass body 50. It may be a member. Accordingly, the mass support rib 13 is not limited to the mass body 50 and is a rib-like member for pivotally supporting the various rotating members as described above, and is formed by integral molding with the key frame. If present, the present invention is applicable.

  From the viewpoint of further improving the mold strength, it is preferable that there is no overlapping portion between the mass support ribs 13W and the mass support ribs 13B.

(Second Embodiment)
In the first embodiment, the rotational shafts 14W and 14B have different front-rear positions, but in the second embodiment of the present invention, in addition to that, the position of the rotational shaft 14W and the rotation Each of the positions of the shafts 14B is configured to gradually vary according to the pitch.

  FIG. 7 is a partial plan view schematically showing a state in which the mass body is assembled to the key frame in the keyboard device according to the second embodiment of the present invention. FIG. 8A is a side view schematically showing a state where the mass body is assembled to the key frame, and FIG. 8B is a rear view schematically showing the state.

  As shown in FIG. 7, the positions of the pivot shafts 14 </ b> W and 14 </ b> B in the front-rear direction are gradually closer to the rear side toward the high-pitched sound side. Therefore, for each of the white key 20 and the black cum 40, the touch on the high tone side is lighter. Nevertheless, the positional relationship between the rotating shaft 14W and the rotating shaft 14B is basically the same as that of the first embodiment, and the rotating shaft 14B is located rearward. Therefore, the touch of the black key 40 is light, and the weight of the touch with the white key 20 is balanced. By the way, when compared with the rotating shaft 14W on the high sound side and the rotating shaft 14B on the low sound side, the anteroposterior relationship may be reversed. However, at least in view of the positional relationship between the rotation shaft 14W and the rotation shaft 14B adjacent to each other, the rotation shaft 14B is located closer to the rear side than the rotation shaft 14W, and changes according to the pitch. There is no sense of incongruity in the weight of touch.

  The key frame 110 is that the position of the mass support ribs 13W and 13B (not shown) is gradually changed in accordance with the above-described gradual change according to the pitch of the rotation shafts 14W and 14B. Unlike the frame 10, the configuration of other parts is the same. Further, the configuration of each mass body 50W, 50B itself is the same as that of the first embodiment, and the arrangement in the front-rear direction only differs depending on the position of the rotation shafts 14W, 14B. Accordingly, the positions of the lower engagement pieces 53W and 53B and the rear end portions 52W and 52B are also different from those in the first embodiment depending on the arrangement of the mass bodies 50W and 50B. Further, the key unit KU is compared with the first embodiment, depending on the position of the lower engagement pieces 53W and 53B of the mass bodies 50W and 50B, depending on the driving hanging pieces 29 and 45 and the elastic member. Although the position of 31 is different (none is shown), the configuration of the other parts is the same.

  By the way, as described above, the touch becomes lighter toward the high-pitched sound side. However, if the movable range of the rear end portion 52 of the mass body 50 is the same for all the mass bodies 50, the key on the low-pitched sound side is depressed. Stroke is shortened. Therefore, in this embodiment, instead of the upper limit stopper 83 and the lower limit stopper 84 with uniform height in the first embodiment, as shown in FIGS. 8A and 8B, for each mass body 50. An upper limit stopper 183 and a lower limit stopper 184 having different heights are provided on the key frame 110.

  As shown in FIG. 8B, the lower surface of the upper limit stopper 183 is higher as it goes to the low sound side, and the upper surface of the lower limit stopper 184 is lower as it goes to the low sound side. In other words, the distance between the upper limit stopper 183 and the lower limit stopper 184 becomes wider as it goes to the bass side, and therefore the moving stroke of the rear end portion 52 of the mass body 50 is also longer as it goes to the bass side. With this setting, the key pressing strokes in the areas where the white key 20 and the black key 40 are pressed frequently are made uniform for all keys.

  By the way, if the above-described gradual change of the position of the rotation shafts 14W and 14B according to the pitch is continuously performed over the entire sound range, the longitudinal length of the keyboard device 1 becomes too long. Therefore, in the present embodiment, the gradual change is repeated for each sound range (one octave) corresponding to the key unit KU, and the grade (mass) of the mass body 50 to be used is different for each sound range. Yes. For example, in the second sound range one higher than the first sound range, the grade of the mass body 50 is lowered (lightened) by one step, and the gradual change pattern of the position of the rotating shaft 14 in the front-rear direction is as described above. The same as the first sound range. Therefore, the positions of the leftmost rotation shafts 14 are the same in each sound range. Note that the gradual change pattern may not necessarily be repeated for each tone range corresponding to the key unit KU, for every several octaves, or for every plurality of keys.

  According to the present embodiment, with respect to ensuring a good balance of the touch feeling between the white key 20 and the black key 40 and making the depth direction of the keyboard device 1 compact, the first embodiment and The same effect is produced. In addition, key scaling of the weight of the touch (making the weight gradually change according to the pitch) can be easily realized. Moreover, since the interval between the upper limit stopper 183 and the lower limit stopper 184 is gradually changed according to the pitch, the key pressing stroke between the white keys 20 and the key pressing stroke between the black keys 40 are made uniform. Thus, the touch feeling of the key press becomes appropriate according to the pitch. These can be performed without making the mass body 50 different for each key, so that all-key key scaling can be performed with a small number of types of mass bodies 50.

  In the second embodiment, in terms of realizing the key scaling of the touch weight, the position of the lower engagement piece 53 in the entire mass body 50 in the front-rear direction is the same, and The distance between the lower engagement piece 53 and the rotating shaft 14 may be increased for the mass bodies 50W and 50B as the higher sound side.

  In the first and second embodiments, the configuration in which the lower engagement piece 53 of the mass body 50 is positioned forward with respect to the rotation shaft 14 is illustrated, but the present invention is not limited to this. For example, the present invention can also be applied to the above-described embodiments when the mass body 50 is reversed in the front-back direction and the free end portion is directed forward. In that case, the positional relationship between the lower engagement piece 53 and the rotating shaft 14 in each mass body 50 is reversed, and the positional relationship between the rotating shafts 14W and 14B is also between the mass bodies 50W and 50B. The positional relationship between the lower engagement pieces 53W and 53B is also reversed.

  In the first and second embodiments, the key unit KU in which a plurality of keys are integrated is used. However, the present invention is not limited to this, and each key may be independent.

  DESCRIPTION OF SYMBOLS 1 Keyboard apparatus, 10, 110 Key frame (support member), 13 Mass support rib, 14 Rotation shaft (rotation fulcrum part), 20 White key, 30 Common base end part (base end part), 31 Elastic member ( Driving part), 40 black key, 50W mass body (white key corresponding mass body), 50B mass body (black key corresponding mass body), 53 lower engagement piece (driven part), 83, 183 upper limit stopper, 84, 184 Lower limit stopper

Claims (2)

A support member;
A plurality of keys each including a plurality of white keys and a plurality of black keys, each having a drive unit and disposed on the support member so as to be rotatable at a base end portion;
A plurality of pivot fulcrum portions fixedly provided on the support member, each of which is stationary;
It is assembled corresponding to each of the plurality of pivot fulcrum parts, and has a driven part that engages the drive part of the key on one end side with respect to the pivot fulcrum part, and a mass part on the other end side, A plurality of mass bodies each including a white key corresponding mass body corresponding to each of the white keys and a black key corresponding mass body corresponding to each of the black keys, each of which is rotatably disposed around a corresponding rotation fulcrum portion. And
In response to the rotation of each key, the driven portion of the corresponding mass body is driven by the drive portion of each key so that the corresponding mass body rotates about the corresponding rotation fulcrum. A configured keyboard device,
For each of the plurality of white key-corresponding mass bodies and the plurality of black key-corresponding mass bodies, the position of the driven part in each mass body is located closer to the other end side as the high-pitched mass body,
In the relationship between the black key corresponding mass body and the white key corresponding mass body that are adjacent to each other, the distance between the driven portion and the rotation fulcrum portion in the black key corresponding mass body is the distance between the driven portion and the rotation fulcrum portion in the white key corresponding mass body. Longer than the distance between the drive and the pivot point,
In the relationship between the black key corresponding mass body and the white key corresponding mass body that are adjacent to each other, the rotational fulcrum portion corresponding to the black key corresponding mass body has a position in the front-rear direction corresponding to the white key corresponding mass body. It is closer to the other end side with respect to the moving fulcrum part,
For each of the plurality of white key-corresponding mass bodies and the plurality of black key-corresponding mass bodies, the position of the rotation fulcrum portion in each mass body is located closer to the other end side as the high-pitched mass body. A keyboard device characterized by   2. The touch feeling of each key for each of the plurality of white key corresponding mass bodies and the plurality of black key corresponding mass bodies is gradually lightened from the low sound side to the high sound side. The keyboard device described.

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