Keyboard device and key guiding method

Abstract

The invention provides a keyboard device capable of improving the touch feeling of keys and a key guiding method. A mounting member (6) having a guide groove (60), which guides the swinging of the rear part of a white key (2a) by the sliding of a shaft part (41) and the guide groove (60), is formed from a soft material having a hardness lower than that of a resin (for example, an ABS resin) that is the material of the white key (2a) or a chassis (4). Consequently, compared with the case in which the attachment member (6) is formed using, for example, the same (relatively hard) material as the white key (2a) or the chassis (4), the case in which noise is generated when the guide groove (60) slides along the shaft section (41) of the chassis (4) can be suppressed. Therefore, a good playing feeling can be provided for a player.

Description

Technical Field

[0001] The present invention relates to a keyboard device and a key guiding method, and in particular to a keyboard device and a key guiding method capable of providing a good playing feeling. Background Art

[0002] For example, Patent Document 1 discloses a technique in which a guide groove 60 (guide groove) is formed in a guide member 6 supported by a rear base 50 (support member), and a guide pin 12 (guide shaft) inserted into the guide groove 60 is formed at the rear of a white key 10. In this technique, the rear of the white key 10 is displaced in a sinking manner by sliding between the guide pin 12 and the guide groove 60 when the white key 10 is pressed, thereby providing a playing feel close to that of the keys of an acoustic piano.

[0003] [Prior art literature]

[0004] [Patent Document]

[0005] [Patent Document 1] International Publication No. 2021 / 124477 (e.g., paragraphs 0031, Figure 2 , Figure 3 ) Summary of the invention

[0006] [Problems to be solved by the invention]

[0007] However, in the above-mentioned prior art, noise may be generated when the guide shaft slides along the guide groove, so there is a problem that a good playing feeling cannot be provided to the player.

[0008] The present invention is made to solve the above-mentioned problems, and an object of the present invention is to provide a keyboard device and a key guiding method that can provide a good playing feeling.

[0009] [Technical means to solve the problem]

[0010] In order to achieve the above-mentioned purpose, the keyboard device of the present invention includes a supporting member and a key that is swingably supported on the supporting member, wherein either the supporting member or the key includes a guide groove that guides the swinging of the rear portion of the key, wherein either the supporting member or the key includes a guide shaft that extends along the scale direction and is inserted into the guide groove and slides along the guide groove when the key swings, and wherein at least one of the guide groove and the guide shaft is formed using a material that is softer than the key.

[0011] The key guiding method of the present invention is a key guiding method in a keyboard device, wherein the keyboard device includes a supporting member and a key that is swingably supported on the supporting member, either the supporting member or the key includes a guide groove, and the guide groove guides the swing of the rear portion of the key, and either the supporting member or the key includes a guide shaft, and the guide shaft extends along the scale direction and is inserted into the guide groove, and at least one of the guide groove and the guide shaft is formed using a material that is softer than the key, and the key guiding method guides the swing of the key when the key is pressed by sliding the guide groove and the guide shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a perspective view of a keyboard device according to one embodiment.

[0013] Figure 2 is a cross-sectional view of a keyboard device.

[0014] Figure 3 It means from Figure 2 A cross-sectional view of a keyboard device in which a white key is pressed to a terminal position.

[0015] Figure 4 yes Figure 2 A partial enlarged cross-sectional view of the keyboard device at line IV-IV.

[0016] Figure 5A is a cross-sectional view showing a mold for forming a side plate and a connecting plate. Figure 5B It is a cross-sectional view showing a white key according to a first modification.

[0017] Fig. 6A is a cross-sectional view of a white key of a second variation, Figure 6B is a cross-sectional view of a mold showing a state in which a side plate and a connecting plate are formed using a mold. Figure 6C It is a cross-sectional view of a white key according to a third modified example.

[0018] Fig. 7A is a perspective view showing a white key in a state where the mounting member is removed from the mounting hole. Figure 7B is a side view of the mounting component.

[0019] Fig. 8A is a side view showing a white key inserted into a mounting hole while elastically deforming the mounting member. Figure 8B This is a side view of the white key showing a state in which the mounting member is inverted about its center and inserted into the mounting hole.

[0020] Fig.9A This is a side view of the white key on the highest note side. Fig. 9BThis is a side view of the white key on the lowest note side. Fig. 9C It is a top view of the keys schematically showing the positions of the imaginary axes of the white keys.

[0021] Fig.10 is with Figure 2 A partially enlarged cross-sectional view of the keyboard device 1 at a position corresponding to the X portion.

[0022] Fig.11A is a top view of a key schematically showing the position of an imaginary axis in the first modification, Fig. 11B is a top view of a key schematically showing the position of an imaginary axis in the second modification, Fig. 11C It is a top view of a key schematically showing the position of a virtual axis in the third modification.

[0023] Fig. 12A is a side view of a white key of a fourth variation, Fig. 12B It is a perspective view of the white key showing a state in which the mounting member is removed from the mounting hole.

[0024] Fig.13A is a three-dimensional diagram of the white keys of the fifth variation. Fig. 13B It is a perspective view showing a white key in a state where a mounting member is removed from a protruding portion.

[0025] [Explanation of Symbols]

[0026] 1: Keyboard device

[0027] 2: Key

[0028] 2a, 202a, 302a, 402a, 502a, 602a: White keys (keys)

[0029] 2b: Black Keys (Keys)

[0030] 21, 521: Mounting hole

[0031] 24: Fitting hole (positioning part) (recessed part of positioning part)

[0032] 25, 26: Fitting hole (limiting portion) (recessed portion of the limiting portion)

[0033] 4.404: Chassis (supporting member)

[0034] 41: Shaft (guide shaft)

[0035] 6, 506, 606: Installation components

[0036] 60: Boot slot

[0037] 61: First protrusion (positioning part) (convex part of positioning part)

[0038] 62, 63: second protrusion (limiting portion) (convex portion of the limiting portion)

[0039] 64: Next Door

[0040] 65: Opening

[0041] L1, L2: Dimensions of the convex part of the restricting part

[0042] L3: The size of the convex part of the positioning part

[0043] L4: size of the opening

[0044] Vc: imaginary line DETAILED DESCRIPTION

[0045] Hereinafter, preferred embodiments will be described with reference to the accompanying drawings. Figure 1 and Figure 2 , the overall structure of the keyboard device 1 is described. Figure 1 is a perspective view of a keyboard device 1 according to an embodiment. Figure 2 is a cross-sectional view of the keyboard device 1 .

[0046] In addition, Figure 1 , the figure shows a state where a part of the chassis 4 is cut away to expose the receiving portion 72 of the hammer 7. Figure 2 , a cross section cut on a plane perpendicular to the scale direction (the arrangement direction of the plurality of keys 2) is shown. Figure 2 In the figure, for easy understanding, the hatching of the shaft portion 41 is omitted. Figure 1 and Figure 2 The arrow UD direction, arrow FB direction, and arrow LR direction respectively represent the up-down direction, front-back direction, and scale direction of the keyboard device 1. Figure 3 The same will be true in the future.

[0047] like Figure 1 and Figure 2 As shown, the keyboard device 1 is a keyboard musical instrument (electronic organ) including a plurality of (88 in this embodiment) keys 2. The keys 2 are composed of a plurality of (52 in this embodiment) white keys 2a for playing natural sounds and a plurality of (36 in this embodiment) black keys 2b for playing altered sounds, and the plurality of white keys 2a and black keys 2b are arranged along the scale direction (arrow LR direction).

[0048] The keyboard device 1 includes a frame plate 3 for supporting the white keys 2a and the black keys 2b. The frame plate 3 is formed into a flat plate extending in the scale direction using synthetic resin or steel plate, and a resin chassis 4 is supported on the upper surface of the frame plate 3. Both ends of the chassis 4 in the front and rear directions (in the direction of arrow FB) are fixed to the frame plate 3 through a channel material 5. The supporting structure of the white keys 2a with respect to the chassis 4 and the detailed structure of the white keys 2a are described below, but the above structure is substantially the same for the black keys 2b.

[0049] A wall portion 40 rises upward from the upper surface of the rear end side (arrow B side) of the chassis 4, and a substantially cylindrical shaft portion 41 protrudes from the side surface of the upper end side of the wall portion 40 in the scale direction (see FIG. Figure 1 These wall portion 40 and shaft portion 41 are formed integrally with the chassis 4, but may be formed separately from the chassis 4.

[0050] The wall portion 40 has a plurality of (refer to Figure 1 ), the protrusion 20 of the white key 2a is inserted between the faces of the plurality of wall portions 40. In the following description, a pair of wall portions 40 (shaft portion 41) facing each other across the protrusion 20 is simply described as "a pair of wall portions 40 (shaft portion 41)" or the like for description.

[0051] The protrusion 20 is a portion protruding from the rear end of the white key 2a to the rear side, and the protrusion 20 is formed to be smaller in the scale direction than the portion (the portion to be pressed) on the front end side (arrow F side) of the white key 2a. The mounting member 6 having the guide groove 60 is mounted on the protrusion 20. The mounting member 6 is a part that is inserted into the mounting hole 21 formed in the protrusion 20 (see FIG. Fig. 7A , Figure 7B ), the method of installing the mounting member 6 to the white key 2a (protrusion 20) will be described later.

[0052] The guide groove 60 is formed on both sides of the mounting member 6 in the scale direction, and the shaft 41 formed on the pair of wall portions 40 is fitted into the guide groove 60. When the shaft 41 is fitted into the guide groove 60, the protrusion 20 of the white key 2a is inserted between the pair of shafts 41 from above.

[0053] The shaft portion 41 is provided with an inclined surface 42 (see FIG. Figure 1 The protrusion 20 of the white key 2a is inserted from above between the face-to-face surfaces of the pair of shaft portions 41, so that the protrusion 20 slides along the inclined surface 42 of the shaft portion 41. By the sliding, the plate-like wall portion 40 is elastically deformed, and the face-to-face interval between the pair of shaft portions 41 is expanded, so that the shaft portion 41 can be easily inserted into the guide groove 60.

[0054] The white key 2a is supported slidably (swingably) between the facing surfaces of the pair of wall portions 40 by fitting the shaft portion 41 into the guide groove 60. A hammer 7 is provided below the white key 2a to be interlocked with the swing of the white key 2a.

[0055] A rotation axis 43 is formed in the substantially central portion of the chassis 4 in the front-rear direction along the scale direction (see Figure 2 ), the hammer 7 is rotatably supported on the rotating shaft 43. The hammer 7 includes a mass portion 70 (mass body) for giving a key touch when the white key 2a is pressed, and the mass portion 70 is located further back than the rotating shaft 43 (arrow B side).

[0056] The portion of the hammer 7 that is closer to the front side (arrow F side) than the rotating shaft 43 is configured as a pressing portion 71 for pressing the switch 80 of the base plate 8 when the white key 2a is pressed. A receiving portion 72 that is recessed downward is formed on the upper surface of the pressing portion 71, and the protrusion 22 inserted into the receiving portion 72 protrudes downward from the lower surface of the white key 2a.

[0057] Since the protrusion 22 is simply inserted (mounted) in the receiving portion 72, when assembling the white key 2a, after the protrusion 22 is mounted on the receiving portion 72, the protrusion 20 is inserted between the faces of the wall portion 40 as described above and the shaft portion 41 is inserted into the guide groove 60. Thus, the assembly operation of the white key 2a with respect to the chassis 4 can be easily performed.

[0058] On the other hand, when removing the white key 2a from the chassis 4, the wall portion 40 is elastically deformed (the wall portion 40 is opened) to remove the shaft portion 41 from the guide groove 60, and then the protrusion 22 is pulled out from the receiving portion 72. Thus, the removal operation of the white key 2a can be easily performed, thereby improving the maintainability of the white key 2a.

[0059] The lower surface of the protrusion 22 of the white key 2a is formed into a circular arc shape convex downward, and the bottom surface of the receiving portion 72 of the hammer 7 is also formed into a circular arc shape convex downward. The curvature of the contact portion between the lower surface of the protrusion 22 and the bottom surface of the receiving portion 72 is the same. In the initial state before the white key 2a is pressed ( Figure 2 state) (hereinafter referred to as “initial position before pressing the key”, etc.), the lower surfaces of these protrusions 22 are in surface contact with the bottom surface of the receiving portion 72.

[0060] Next, refer to Figure 2 and Figure 3 , the operation when the white key 2a is pressed will be described. Figure 3 It means from Figure 2 sectional view of the keyboard device 1 in a state where the white key 2a is pressed to the terminal position.

[0061] like Figure 2and Figure 3 As shown, when the white key 2a is pressed from the initial position, the lower surface of the protrusion 22 slides along the bottom surface of the receiving portion 72, and the pressing portion 71 (receiving portion 72) is pressed downward by the protrusion 22, thereby rotating the hammer 7 around the rotation axis 43 ( Figure 2 , Figure 3 Clockwise) (refer to Figure 3 ).

[0062] A switch 80 is provided below the pressing portion 71 of the hammer 7, and as the hammer 7 rotates when the white key 2a is pressed, the switch 80 is pressed by the pressing portion 71. The key information (note information) of the white key 2a is detected by turning the switch 80 on / off, and a musical sound signal based on the detection result is output to the outside.

[0063] Thus, the swing of the front end side portion of the white key 2a when the key is pressed is guided by the rotation of the hammer 7 around the rotation axis 43. On the other hand, the swing of the rear end side portion of the white key 2a (the rear portion further to the rear side than the center of the white key 2a in the front-rear direction) is guided by the sliding of the guide groove 60 along the shaft portion 41 of the chassis 4.

[0064] When the white keys 2a swing up and down, unstable movement of the white keys 2a such as rotation of the white keys 2a around their axes in the front-rear direction (so-called rolling) may occur. Therefore, the chassis 4 is provided with front guides 44 for stabilizing the swing of the white keys 2a.

[0065] The front guide 44 is a plate-shaped metal member mounted on the chassis 4. The front guide 44 stands upward from the front end of the chassis 4, and the front guide 44 is inserted into the recess 23 formed on the lower surface of the front end of the white key 2a. A rubber cover 45 is attached to the front guide 44, and the inner surface of the recess 23 (the surface facing the inner side in the scale direction) contacts the cover 45, so that the swing of the front end of the white key 2a is guided.

[0066] The front guide 44 (cover 45) guides the swing of the white key 2a at a position further forward than the engagement position between the white key 2a and the hammer 7, but the swing of the rear end side of the white key 2a is guided by the rear guide 46 (see FIG. Figure 2 , Figure 3 The rear guide 46 includes: a wall portion 46a formed at the rear side of the shaft portion 41 of the chassis 4; and a guide protrusion 46b protruding from the side of the wall portion 46a, through which the up and down swing of the white key 2a (protrusion 20) is guided. For the detailed structure of the rear guide 46, refer to Figure 4 Provide explanation. Figure 4 yes Figure 2A partial enlarged cross-sectional view of the keyboard device 1 at the IV-IV line. Figure 4 , an end face (only a cross-sectional shape) of the white key 2a is shown.

[0067] like Figure 4 As shown, the wall portion 46a of the rear guide 46 is formed in a wall shape rising upward from the chassis 4, and the guide protrusion 46b protrudes from the wall portion 46a in the scale direction. The wall portion 46a and the guide protrusion 46b are formed integrally with the chassis 4, but may also be formed separately from the chassis 4.

[0068] A plurality of wall portions 46a are arranged in the scale direction (arrow LR direction), and the protrusion 20 of the white key 2a is sandwiched between a pair of guide protrusions 46b provided between the plurality of wall portions 46a facing each other. In the following description, the pair of wall portions 46a (guide protrusions 46b) facing each other with the protrusion 20 interposed therebetween will be described simply as "a pair of wall portions 46a (guide protrusions 46b)" or the like.

[0069] The protrusion 20 is formed into a box shape, which includes a pair of side plates 20a facing each other in the scale direction, and a connecting plate 20b connecting the lower ends of the pair of side plates 20a to each other in the scale direction. The front end surface of the guide protrusion 46b (the surface facing the side plate 20a) is a guide surface 46c that guides the up and down swinging of the side plate 20a, and the side surface of the protrusion 20 facing the guide surface 46c in the scale direction (the outer surface of the side plate 20a) is a guided surface 20c.

[0070] The guide surface 46c is a plane perpendicular to the scale direction, and a notch 46d is formed at the upper end of the pair of guide surfaces 46c, which is inclined upward in a direction away from the face-to-face relationship between the two faces (the protrusion 20 side). By forming such a notch 46d, when the protrusion 20 is inserted from above between the face-to-face relationships of the pair of guide protrusions 46b, the insertion can be guided by the notch 46d.

[0071] The guided surface 20c of the white key 2a is composed of an inclined surface 20c1 inclined so that the distance from the guide surface 46c gradually widens from the upper end to the lower end of the side plate 20a, and a curved surface 20c2 connected to the lower end of the inclined surface 20c1.

[0072] The inclined surface 20c1 is a plane inclined at an angle greater than 0.5° and less than 1° relative to the guide surface 46c (vertical direction), and the curved surface 20c2 is an arc-shaped curved surface connecting the lower end of the inclined surface 20c1 (the outer surface of the side plate 20a) and the lower surface 20d of the connecting plate 20b.

[0073] exist Figure 4, the initial state before the white key 2a is pressed is illustrated, but when the white key 2a is pressed from this state, the guided surface 20c (the inclined surface 20c1 and the curved surface 20c2) slides (glides) downward relative to the guide surface 46c, and when the white key 2a is released from the pressed state, the guided surface 20c slides upward relative to the guide surface 46c.

[0074] Due to the upward sliding of the guided surface 20c during the release, the grease applied on the guiding surface 46c and the guided surface 20c is scraped upward, but in the present embodiment, the grease scraped upward is easily retained in the sliding area between the guiding surface 46c and the guided surface 20c (hereinafter referred to as the "sliding area of ​​the guided surface 20c").

[0075] Specifically, in the initial position before the key is pressed, the entirety of the guided surface 20c (from the upper end of the inclined surface 20c1 to the lower end of the curved surface 20c2) faces the guide surface 46c in the scale direction. Figure 4 In the case of the state), the guided surface 20c (inclined surface 20c1) does not protrude further upward than the guide surface 46c.

[0076] Thus, the grease scraped upward by the swing of the white key 2a can be prevented from being pushed out to the upper surface side of the cutout 46d or the guide protrusion 46b. Moreover, the grease scraped upward flows downward along the guide surface 46c due to its own weight, so the grease is easily retained in the sliding area of ​​the guided surface 20c. Thus, the key touch of the white key 2a can be improved.

[0077] In addition, the interval between the guide surface 46c and the guided surface 20c (the inclined surface 20c1 and the curved surface 20c2) is formed to gradually widen from the upper end side to the lower end of the guided surface 20c. Thus, a small gap is formed between the guide surface 46c and the lower end of the guided surface 20c, and the gap is formed to gradually increase as it approaches the lower end of the guided surface 20c. Thus, when the guided surface 20c slides downward relative to the guide surface 46c, the grease can be prevented from being scraped downward. Thus, it is also easy to keep the grease in the sliding area of ​​the guided surface 20c, so the key touch of the white key 2a can be improved.

[0078] Here, in order to prevent the grease from being easily scraped off, for example, the curved surface 20c2 may be omitted (the inclined surface 20c1 is extended and connected to the lower surface 20d of the connecting plate 20b), and the inclined angle of the inclined surface 20c1 relative to the guide surface 46c may be formed to be relatively large. However, in the case of such a structure, the larger the inclined angle of the inclined surface 20c1 relative to the guide surface 46c, the easier it is to cause shaking when the guided surface 20c slides relative to the guide surface 46c, and thus the swing of the white key 2a cannot be stably guided. On the other hand, the closer the inclined angle of the inclined surface 20c1 is to being parallel to the guide surface 46c, the easier it is for the grease to be scraped off downward when the white key 2a swings.

[0079] In contrast, the guided surface 20c of the present embodiment is composed of an inclined surface 20c1, which is a plane inclined relative to the guiding surface 46c, and a curved surface 20c2 connected to the lower end of the inclined surface 20c1. The interval between the curved surface 20c2 and the guiding surface 46c is wider than that between the inclined surface 20c1, and a relatively wide gap is formed between the curved surface 20c2 and the guiding surface 46c, so that the scraping of the grease can be effectively suppressed by utilizing the gap.

[0080] That is, by mainly making the curved surface 20c2 have the function of suppressing the scraping of the grease, the angle of the inclined surface 20c1 relative to the guide surface 46c can be made as close to parallel as possible, and the function of suppressing the scraping of the grease can be fully exerted. As a result, the shaking generated when the guided surface 20c slides relative to the guide surface 46c can be suppressed, and the grease can be suppressed from being scraped off due to the sliding.

[0081] In addition, in the present embodiment, the gap between the lower end of the guided surface 20c and the guide surface 46c is widened by forming the curved surface 20c2 at the lower end of the inclined surface 20c1, but the present invention is not necessarily limited to this. For example, the curved surface 20c2 may be an inclined surface (plane) inclined relative to the guide surface 46c, and the inclination angle (angle relative to the guide surface 46c) of the inclined surface may be larger than that of the inclined surface 20c1. In this structure, the shaking of the guided surface 20c when sliding relative to the guide surface 46c can be suppressed, and the grease can be suppressed from being scraped off due to the sliding.

[0082] Next, refer to Figure 5A , a method for molding the side plate 20a and the connecting plate 20b (the protruding portion 20 of the white key 2a) using the mold 100 will be described. Figure 5A It is a cross-sectional view of the die 100 showing a state of molding the side plate 20a and the connecting plate 20b.

[0083] like Figure 5AAs shown, the mold 100 for molding the side plate 20a and the connecting plate 20b includes a lower mold 101 and an upper mold 102. A concave portion 101a is formed in the lower mold 101, and a convex portion 102a inserted into the concave portion 101a is formed in the upper mold 102. When the convex portion 102a is inserted into the concave portion 101a, a cavity having a shape corresponding to the pair of side plates 20a and the connecting plate 20b is formed in the mold 100. After a heated and molten resin material is injected into the cavity from an injection port (not shown), the resin material is cooled (solidified), thereby molding the side plate 20a and the connecting plate 20b.

[0084] The formed side panel 20a and connecting panel 20b are demolded from the mold 100. As described above, the inclined surface 20c1 constituting the side surface of the side panel 20a has an angle of greater than 0.5° and less than 1°, and the inclination also functions as a draft angle for demolding the side panel 20a from the recess 101a of the lower mold 101.

[0085] In addition, the inner surfaces 20e of the side plates 20a facing each other between the pair of side plates 20a are also inclined at an angle parallel to the inclined surface 20c1, and this inclination also serves as a draft angle for demolding the side plates 20a from the protrusions 102a of the upper mold 102.

[0086] When the white key 2a is formed using such a resin material, in order to prevent the deterioration of its formability, the plate thickness of each part of the white key 2a needs to be set to 2mm to 3mm. Figure 5B If the protrusion 220 is formed into a single plate shape as in the white key 202a of the first modified example shown, it is difficult to ensure the rigidity of the protrusion 220. If the rigidity of the protrusion 220 is low, the protrusion 220 sandwiched by the guide protrusion 246b is easily deformed when the white key 202a swings, which may cause a problem that the swing of the white key 202a cannot be stably guided or the protrusion 220 is easily damaged.

[0087] In contrast, the protrusion 20 of the present embodiment is formed into a box shape, which includes: a pair of side plates 20a, the outer surfaces of which face the scale direction and are formed as guided surfaces 20c; and a connecting plate 20b, which connects the pair of side plates 20a to each other in the scale direction. Thus, even when the white key 2a is molded using a resin material, that is, when the thickness of each plate 20a, 20b of the protrusion 20 is limited to 2mm to 3mm, the rigidity of the protrusion 20 can be ensured. By ensuring the rigidity of the protrusion 20, the swing of the white key 2a can be stably guided, and the protrusion 20 can be prevented from being damaged.

[0088] Here, in the case where the protrusion 20 of the white key 2a is formed into a box shape, for example, Fig. 6AAs shown in the second modified example of the white key 302a, the upper ends of the side plates 20a of the protrusion 320 are connected to each other by the connecting plate 320b. The method of forming such a protrusion 320 by the mold 200 will be referred to. Figure 6B As will be described later, if the protrusion 320 is provided with a draft angle when formed by the die 200, the thickness of the side plate 20a needs to be tapered. Therefore, there is a problem that the formability of the protrusion 320 is deteriorated or the rigidity of the protrusion 320 is reduced.

[0089] In contrast, in this embodiment, if Figure 5A As shown, the lower ends of a pair of side plates 20a are connected to each other by a connecting plate 20b, thereby forming the protrusion 20 into a box shape, and the interval between the inner surfaces 20e of the pair of side plates 20a gradually narrows as it approaches the lower end side of the side plate 20a. As a result, the side plate 20a can be formed with a draft angle relative to the lower mold 101 and the upper mold 102, and the plate thickness of the side plate 20a can be made substantially constant (the inclined surface 20c1 and the inner surface 20e of the side plate 20a can be formed substantially parallel), so that the formability of the protrusion 20 can be improved. Furthermore, by forming the plate thickness of the side plate 20a to be constant, the rigidity of the protrusion 20 can be ensured, so that the swing of the white key 2a can be stably guided.

[0090] Thus, in this embodiment, the rear end side of the protrusion 20 is formed into a box shape by a pair of side plates 20a and a connecting plate 20b, but the rear end side of the space surrounded by the plates 20a and 20b is closed by a closing plate 20f (see Figure 3 The lower end of the closing plate 20f is connected to the connecting plate 20b, and the scale direction ( Figure 3 The two ends of the closing plate 20f on the arrow LR direction) are connected to a pair of side plates 20a. By providing such a closing plate 20f, the rigidity of the protrusion 20 can be improved, so the swing of the white key 2a can be stably guided.

[0091] Next, refer to Figure 5B , the white key 202a of the first modified example will be described. In addition, the same reference numerals are given to the same parts as those in the above-mentioned embodiment, and the description thereof will be omitted. Figure 5B is a cross-sectional view of the white key 202a of the first variant. Figure 5B In the figure, the Figure 4 The keyboard device 1 is cut into corresponding positions (refer to Figure 2 ) section.

[0092] like Figure 5BAs shown, in the white key 202 a of the first modification, the protrusion 220 is formed in a single plate shape, and the guided surface 20 c (the inclined surface 20 c 1 and the curved surface 20 c 2 ) described in the above embodiment is formed on the side surface of the plate-shaped protrusion 220 .

[0093] The pair of guide protrusions 246b sandwiching the protrusion 220 from both sides in the scale direction are similar to the guide protrusions 46b described in the above embodiment (see FIG. Figure 4 That is, a guide surface 46c similar to that of the above-mentioned embodiment is formed on the front end surface of the guide protrusion 246b.

[0094] In the white key 202a of the first modified example, at the initial position before the key is pressed, the entirety of the guided surface 20c (the inclined surface 20c1 and the curved surface 20c2) also faces the guide surface 46c. Figure 5B When the white key 202a is in the state of being pressed, the grease scraped by the white key 202a is pushed out to the upper surface side of the cutout 46d or the guide protrusion 246b. Thus, the grease is easily retained in the sliding area of ​​the guided surface 20c.

[0095] In addition, the interval between the guide surface 46c and the guided surface 20c (the inclined surface 20c1 and the curved surface 20c2) gradually widens from the upper end side to the lower end of the guided surface 20c, so that even if the guided surface 20c slides downward relative to the guide surface 46c when the white key 202a is pressed, the grease applied on the surfaces 20c and 46c is not easily scraped off downward. As a result, the grease is easily retained in the sliding area of ​​the guided surface 20c.

[0096] Next, refer to Fig. 6A and Figure 6B , the white key 302a of the second variation example is described. Fig. 6A is a cross-sectional view of a white key 302a of a second modified example, Figure 6B 2 is a cross-sectional view of the mold 200 showing the side plate 20a and the connecting plate 320b being formed using the mold 200. Fig. 6A In the figure, the Figure 4 The keyboard device 1 is cut into corresponding positions (refer to Figure 2 ) section.

[0097] The white key 302a of the second modified example is similar to the white key 2a described in the above embodiment (see FIG. 1 ), except that the connecting plate 320b of the protrusion 320 connects the upper ends of the side plates 20a in the scale direction. Figure 4 )Same structure.

[0098] That is, the protrusion 320 is formed into a box shape with an opening on the lower surface side, and the guided surface 20c is formed on the side of the box-shaped protrusion 320 (side plate 20a). The inner end of the curved surface 20c2 of the guided surface 20c in the scale direction is connected to the lower end of the inner surface 20e of the side plate 20a.

[0099] In the white key 302a of the second modified example, at the initial position before the key is pressed, the entirety of the guided surface 20c (the inclined surface 20c1 and the curved surface 20c2) also faces the guide surface 46c. Fig. 6A When the white key 302a is in the state of being pressed, the grease scraped by the white key 302a is pushed out to the upper surface side of the cutout 46d or the guide protrusion 46b. Thus, the grease is easily retained in the sliding area of ​​the guided surface 20c.

[0100] In addition, the interval between the guide surface 46c and the guided surface 20c (the inclined surface 20c1 and the curved surface 20c2) gradually widens from the upper end side to the lower end of the guided surface 20c, so that even if the guided surface 20c slides downward relative to the guide surface 46c when the white key 302a is pressed, the grease applied on the surfaces 20c and 46c is not easily scraped off downward. As a result, the grease is easily retained in the sliding area of ​​the guided surface 20c.

[0101] like Figure 6B As shown, the mold 200 for molding the side plate 20a and the connecting plate 320b is obtained by omitting the convex portion 102a described in the above embodiment from the upper mold 202 (see Figure 5A ), and a mold having the convex portion 102a is formed on the bottom surface of the concave portion 101a of the lower mold 201 (inverted up and down).

[0102] In the case where the convex portion 102a is formed on the lower mold 201, in order to form a draft angle relative to the lower mold 201 on the side plate 20a, it is necessary to make the inner surface 20e of the side plate 20a inclined from its upper end to the lower end in a direction close to the inclined surface 20c1. That is, the lower end side of the side plate 20a becomes a tapered shape. Therefore, in the case where the rigidity of the protrusion 320 is further ensured, or in the case where the formability of the protrusion 320 is improved, it is preferable to use the embodiment described above (see Figure 5A ) as shown in FIG. 2 , the lower ends of the side plates 20a are connected to each other using the connecting plate 20b.

[0103] Next, refer to Figure 6C , the white key 402a of the third variation example is described. Figure 6C is a cross-sectional view of a white key 402a of the third variant. Figure 6C In the figure, the Figure 4 The keyboard device 1 is cut into corresponding positions (refer to Figure 2 ) section.

[0104] like Figure 6C As shown, the white key 402a of the third modified example has an insertion hole 420g extending vertically formed in the protrusion 420, and a columnar rear guide 447 standing from the chassis 4 is inserted into the insertion hole 420g.

[0105] The guide surfaces 447a of the rear guide 447 facing both sides in the scale direction are planes perpendicular to the scale direction. The pair of inner surfaces of the insertion hole 420g facing the inner side in the scale direction are guided surfaces 420h facing the guide surfaces 447a.

[0106] The guided surface 420h is composed of an inclined surface 420h1 inclined so that the distance from the guide surface 447a gradually increases from the upper end to the lower end thereof, and a curved surface 420h2 connected to the lower end of the inclined surface 420h1.

[0107] The inclined surface 420h1 is a plane inclined at an angle of 0.5° or more and less than 1° relative to the guide surface 447a (vertical direction), and the curved surface 420h2 is an arc-shaped curved surface connecting the lower end of the inclined surface 420h1 and the side surface of the protrusion 420 .

[0108] In the white key 402a of the third variant, at the initial position before the key is pressed, the entirety of the guided surface 420h (the inclined surface 420h1 and the curved surface 420h2) also faces the guide surface 447a. Figure 6C ), the grease scraped up by the protrusion 420 is pushed out to the upper surface side of the rear guide 447. Thus, the grease is easily retained in the sliding area of ​​the guided surface 420h.

[0109] In addition, the interval between the guide surface 447a and the guided surface 420h (the inclined surface 420h1 and the curved surface 420h2) is formed so as to gradually widen from the upper end side to the lower end of the guided surface 420h. Thus, a small gap is formed between the guide surface 447a and the lower end of the guided surface 420h, and the gap is formed so as to gradually increase as it approaches the lower end of the guided surface 420h. Thus, even if the guided surface 420h slides downward relative to the guide surface 447a when the white key 402a is pressed, the grease applied on the surfaces 420h and 447a is not easily scraped off downward. Thus, the grease is also easily retained in the sliding area of ​​the guided surface 420h.

[0110] return Figure 2 and Figure 3As described above, the swing of the rear end portion of the white key 2a is guided by the guide groove 60 sliding along the shaft portion 41 of the chassis 4. The mounting member 6 formed with the guide groove 60 can be formed using a flexible resin material (for example, an elastomer or rubber). That is, the mounting member 6 is formed using a soft material having a lower hardness than the resin (for example, acrylonitrile butadiene styrene (ABS) resin) used as the material of the white key 2a or the chassis 4, so that, compared with the case where the mounting member 6 is formed using the same (relatively hard) material as the white key 2a or the chassis 4, the generation of noise when the guide groove 60 slides along the shaft portion 41 of the chassis 4 can be suppressed. As a result, a good playing feeling can be provided to the performer.

[0111] Here, the point where the center of the shaft portion 41 is located in the initial position before the key is pressed is recorded as the starting point P1 of the guide groove 60 (refer to Figure 2 The point at which the center of the shaft portion 41 is located at the terminal position of the key is recorded as the end point P2 of the guide groove 60 (refer to Figure 3 ) for illustration.

[0112] The guide groove 60 extends linearly in a downwardly inclined manner toward the front and the bottom in a side view, and its starting point P1 is located at a position further toward the front and the bottom than the end point P2. In addition, the starting point P1 and the end point P2 of the guide groove 60 are both located on an imaginary circle Vb centered on the imaginary rotation axis (hereinafter referred to as "imaginary axis Va") of the white key 2a.

[0113] The imaginary axis Va is a point located further back and lower than the shaft portion 41 in a side view, and is a point indicating the same position as the swing fulcrum (rotation axis) of the key of an acoustic piano. Thus, when the white key 2a is pressed, the white key 2a can be swung in a displacement trajectory close to that of the key of an acoustic piano by sliding along the guide groove 60 of the shaft portion 41. Therefore, the player can be provided with a playing feeling close to that of an acoustic piano.

[0114] In a state where the shaft portion 41 is located at the starting point P1 of the guide groove 60 (see Figure 2 In the case of the enlarged portion (see FIG. 1 ), a gap is formed between the shaft portion 41 and the inner peripheral surface of the starting end (lower end) side of the guide groove 60. On the other hand, when the shaft portion 41 is located at the end point P2 of the guide groove 60 (see FIG. 1 ), a gap is formed between the shaft portion 41 and the inner peripheral surface of the starting end (lower end) side of the guide groove 60. Figure 3 Similarly, a gap is formed between the shaft portion 41 and the inner peripheral surface of the terminal end (upper end) side of the guide groove 60.

[0115] That is, when the area of ​​the inner circumferential surface of the guide groove 60 where the shaft portion 41 slides from the starting point P1 to the end point P2 is set as the sliding surface of the guide groove 60, in each of the initial position before the key is pressed and the terminal position of the key, the outer circumferential surface of the shaft portion 41 contacts only the sliding surface of the guide groove 60. Thus, when the white key 2a is pressed to the terminal position or when the white key 2a returns to the initial position from the terminal position, it is possible to suppress the shaft portion 41 from contacting (colliding) with the inner circumferential surface of the starting end side or the terminal side of the guide groove 60. Thus, the noise caused by the contact can also be suppressed, so that a good playing feeling can be provided to the performer.

[0116] Next, refer to Fig. 7A , Figure 7B and Fig. 8A , Figure 8B , the detailed structure of the mounting component 6 is described. Fig. 7A 2 is a perspective view showing a white key 2a in a state where the mounting member 6 is removed from the mounting hole 21. Figure 7B It is a side view of the mounting member 6. Fig. 8A 2 is a side view showing a white key 2a inserted into the mounting hole 21 while the mounting member 6 is elastically deformed. Figure 8B This is a side view of the white key 2 a showing a state in which the mounting member 6 is inverted about the center C and inserted into the mounting hole 21 .

[0117] like Fig. 7A , Figure 7B As shown in FIG. 1 , a mounting hole 21 having a circular cross section for inserting the mounting member 6 is formed on the protruding portion 20 of the white key 2a, and the outer shape of the mounting member 6 is formed into a cylindrical shape (a shape corresponding to the mounting hole 21) having a central axis along the scale direction. In the following description, the direction around the outer peripheral surface of the mounting member 6 and the direction around the inner peripheral surface of the mounting hole 21 are described as circumferential directions for description.

[0118] A rectangular first protrusion 61 and second protrusions 62 and 63 are integrally formed on the outer peripheral surface of the mounting member 6. The first protrusion 61 is a protrusion for limiting the rotation of the mounting member 6 relative to the mounting hole 21, and the second protrusions 62 and 63 are protrusions for limiting the mounting member 6 from falling off from the mounting hole 21.

[0119] The first protrusion 61 is formed at one point in the circumferential direction of the mounting member 6, and the second protrusions 62 and 63 are formed at two points in the circumferential direction of the mounting member 6. One of the second protrusions 62 and 63 protrudes from the central portion in the musical scale direction of the outer peripheral surface (front end surface) of the first protrusion 61, and the other second protrusion 63 protrudes from the central portion in the musical scale direction of the outer peripheral surface of the mounting member 6 in the opposite direction to the second protrusion 62 (first protrusion 61).

[0120] The first protrusion 61 extends in the scale direction so as to be connected to each of a pair of side surfaces of the mounting member 6 , while the second protrusions 62 and 63 are formed to have a smaller dimension in the scale direction than the first protrusion 61 (mounting member 6 ).

[0121] The inner peripheral surface of the mounting hole 21 is formed with a fitting hole 24 at a position corresponding to the first protrusion 61, and a fitting hole 25 and a fitting hole 26 (for the fitting hole 26, refer to Fig. 8A , Figure 8B ).

[0122] The fitting holes 24 are formed as a pair with the fitting holes 25 (arranged in the scale direction) for inserting the second protrusions 62 therebetween, and the pair of fitting holes 24 are connected to the side surfaces of the protrusions 20 of the white key 2a (exposed to the side surfaces of the protrusions 20). The inner diameter of the mounting hole 21 of the white key 2a is formed to be slightly larger than the outer diameter of the mounting member 6 (the diameter of the region where the protrusions 61 to 63 are not formed), so if the mounting member 6 is, for example, in a shape without the second protrusions 62 and 63, the mounting member 6 can be inserted into the mounting hole 21 (the first protrusion 61 can be inserted into the fitting hole 24) without elastically deforming the mounting member 6.

[0123] On the other hand, in the present embodiment, since the second protrusions 62 and 63 are formed on the mounting member 6, when the mounting member 6 is to be inserted into the mounting hole 21 without elastic deformation, the second protrusions 62 and 63 will be caught on the side of the white key 2a (protrusion 20).

[0124] Therefore, when the protrusions 61 to 63 of the mounting member 6 are inserted into the fitting holes 24 to 26 of the mounting hole 21, as shown in FIG. Fig. 8A As shown, the mounting member 6 is recessed in the region where the second protrusions 62 and 63 are formed by at least the total protrusion dimension L1+L2 (refer to Figure 7B ) is inserted into the mounting hole 21 while being elastically deformed (compressed) by a corresponding amount. Furthermore, by inserting the mounting member 6 until the second protrusions 62 and 63 reach the fitting holes 25 and 26, the shape of the elastically deformed mounting member 6 is restored, and thus the protrusions 61 to 63 are fitted into the fitting holes 24 to 26. Thus, the mounting member 6 is installed in the mounting hole 21.

[0125] The size of the fitting hole 24 in the circumferential direction of the mounting hole 21 is formed to be the same as (or slightly larger than) the size of the first protrusion 61 in the direction, while the size of the fitting holes 25 and 26 in the circumferential direction of the mounting hole 21 is formed to be larger than the second protrusions 62 and 63 in the direction. Thus, when the mounting member 6 is inserted into the mounting hole 21 while being elastically deformed, the second protrusions 62 and 63 can be fitted into the fitting holes 25 and 26 even in a state where the relative positions of the fitting hole 24 and the first protrusion 61 in the circumferential direction are slightly offset.

[0126] If the mounting member 6 is restored to its original shape in a state where the relative positions of the fitting hole 24 and the first protrusion 61 are deviated, the first protrusion 61 is pressed against (hooked on) the inner peripheral surface of the mounting hole 21. However, by rotating the mounting member 6 about its center C until the relative positions of the fitting hole 24 and the first protrusion 61 coincide, the first protrusion 61 can be embedded in the fitting hole 24 by utilizing the restoring force of the mounting member 6. Thus, for example, compared with a case where the sizes of the fitting holes 25 and 26 and the second protrusions 62 and 63 in the circumferential direction coincide with each other, the respective protrusions 61 to 63 can be easily embedded in the fitting holes 24 to 26, thereby improving the workability of the mounting member 6 installation operation.

[0127] Thus, the present embodiment is a structure in which the mounting member 6 having the guide groove 60 formed on the side surface is mounted on the white key 2a (protrusion 20). Thus, compared with a structure in which the guide groove 60 having flexibility is formed integrally with the white key 2a by two-color molding, for example, the mold for molding the white key 2a can be simplified, and thus the manufacturing cost of the white key 2a can be reduced.

[0128] In addition, when the mounting member 6 having the guide groove 60 is formed separately from the white key 2a, for example, the white key 602a of the fifth modified example described later (see Fig.13A , Fig. 13B ), a structure is adopted in which the mounting member 606 formed in a ring shape is embedded in the protrusion 620 of the white key 602a. In the case of such a structure, the details will be described later, but the mounting member 606 needs to be pressed into the protrusion 620 side in a manner that passes over the protruding second limiting portion 628, and the pressing requires a relatively large force. The mounting member 606 is a small part that can be handled by the operator with the fingertips, so in the structure in which the ring-shaped mounting member 606 is pressed into the protrusion 620 side for installation, the installation work requires time.

[0129] In contrast, Fig. 7A , Figure 7BAs shown, in this embodiment, a mounting hole 21 is formed on the white key 2a so as to be able to insert the mounting member 6, and the mounting member 6 is embedded in the mounting hole 21. When the embedding is performed, although the mounting member 6 needs to be as Fig. 8A Although the elastic deformation is shown in the figure, the elastic deformation can be relatively easily performed by the operator pinching the mounting member 6 with the fingertips and compressing it. Thus, the workability of the mounting member 6 relative to the mounting hole 21 can be improved.

[0130] In addition, although the present embodiment has a structure in which the mounting member 6 is mounted on the white key 2a, for example, a mounting member 6 may be mounted on the wall portion 40 of the chassis 4 (see Figure 1 ) is formed with a mounting hole for mounting the mounting member 6, and a guide shaft (corresponding to the shaft portion 41) capable of being inserted into the guide groove 60 of the mounting member 6 is provided on the protrusion 20 of the white key 2a. However, since a plurality of wall portions 40 of the chassis 4 are arranged in the scale direction and formed integrally, the mounting member 6 needs to be mounted on each of the wall portions 40, which requires time for mounting.

[0131] In contrast, in the present embodiment, the mounting holes 21 for mounting the mounting member 6 are formed in the white keys 2a, and the white keys 2a arranged in the scale direction can be removed from the chassis 4. Thus, the work of mounting the mounting member 6 in the mounting hole 21 can be performed individually for each white key 2a in a state where the white key 2a is removed from the chassis 4, so the workability of the mounting work of the mounting member 6 can be improved.

[0132] When the mounting member 6 is mounted in the mounting hole 21, the first protrusion 61 is engaged with the fitting hole 24, so that the change of the mounting angle of the mounting member 6 in the circumferential direction of the mounting hole 21 is restricted. In addition, the second protrusions 62 and 63 are engaged with the fitting holes 25 and 26, so that the mounting member 6 is restricted from falling off from the mounting hole 21.

[0133] As another structure for limiting the change in the installation angle or the fall-off of such an installation member 6, a structure in which the protrusions 61 to 63 (fitting holes 24 to 26) are omitted and the installation member 6 is connected to the installation hole 21 can be exemplified. However, in the above structure, the installation operation of the installation member 6 to each white key 2a requires time.

[0134] In contrast, the present embodiment is a structure in which the first protrusion 61 and the fitting hole 24 (positioning portion), and the second protrusion 62, the second protrusion 63 and the fitting hole 25, the fitting hole 26 (limiting portion) including concave and convex that can fit with each other are formed on the inner circumferential surface of the mounting hole 21 and the outer circumferential surface of the mounting member 6. By utilizing the fitting of these concave and convex to limit the change in the mounting angle of the mounting member 6 or the fall off, it is unnecessary to attach the mounting member 6 to each white key 2a. As a result, the workability of the mounting member 6 installation operation can be improved.

[0135] In addition, as another structure for limiting the change of the installation angle of the mounting member 6 or the fall-off, a structure in which a wall is formed on the outer edge of the fitting hole 24 in the scale direction, and the fall-off of the mounting member 6 is limited by the hooking of the wall and the first protrusion 61 can be exemplified. In the case of such a structure, the first protrusion 61 can be used to limit both the change of the installation angle of the mounting member 6 and the fall-off of the mounting member 6, so the second protrusion 62 and the second protrusion 63 (fitting hole 25, fitting hole 26) can also be omitted. However, if a wall is formed on the outer edge of the fitting hole 24 in the scale direction, it is difficult to grasp the position of the fitting hole 24 when observing the white key 2a from the side, so the operation of inserting the first protrusion 61 into the fitting hole 24 requires time.

[0136] In contrast, in the present embodiment, the fitting hole 24 is formed along the edge of the opening side (outer side in the scale direction) of the mounting hole 21. That is, the fitting hole 24 is exposed to the side surface of the white key 2a (protrusion 20), so it is easy to grasp the position of the fitting hole 24 when observing the white key 2a from the side surface. As a result, the first protrusion 61 can be easily fitted into the fitting hole 24, so the workability of the mounting member 6 can be improved.

[0137] Here, a straight line connecting the centers of the second protrusions 62 and 63 in the circumferential direction of the mounting member 6 is defined as an imaginary line Vc. The guide groove 60 extends so as to intersect (orthogonally intersect) the imaginary line Vc when the mounting member 6 is viewed from the side. Therefore, when the mounting member 6 is compressed as described above (see Fig. 8A ), the mounting member 6 is elastically deformed in such a way as to narrow the groove width of the guide groove 60. Compared with the case where the mounting member 6 is compressed in the longitudinal direction of the guide groove 60, the mounting member 6 is more likely to be elastically deformed in the compression of the mounting member 6 in the direction in which the groove width of the guide groove 60 is narrowed. Thus, the workability of the mounting member 6 installation operation can be improved.

[0138] In the present embodiment, the first protrusion 61 is arranged on the imaginary line Vc (the second protrusion 62 is formed to overlap the first protrusion 61), but for example, the first protrusion 61 may be formed at a position different from the second protrusion 62 in the circumferential direction of the mounting member 6. In this case, the position of the fitting hole 24 may also be changed to match the arrangement of the first protrusion 61.

[0139] However, if the first protrusion 61 is formed at a position different from that of the second protrusion 62, when the mounting member 6 is elastically deformed in order to fit the second protrusions 62 and 63 into the fitting holes 25 and 26, the orientation of the first protrusion 61 (the orientation facing the fitting hole 24) is easily changed due to the distortion of the mounting member 6. Therefore, when the mounting member 6 is inserted into the mounting hole 21, the first protrusion 61 is not fitted into the fitting hole 24 but is easily caught on the side of the white key 2a (protrusion 20).

[0140] In contrast, the present embodiment is a structure in which the first protrusion 61 is arranged on the imaginary line Vc and the second protrusion 62 is formed to overlap the first protrusion 61. Thus, when the mounting member 6 is elastically deformed in order to fit the second protrusion 62 and the second protrusion 63 into the fitting holes 25 and the fitting holes 26, the orientation of the first protrusion 61 facing the fitting holes 24 is not easily changed. Thus, when the mounting member 6 is elastically deformed and inserted into the mounting hole 21, the first protrusion 61 is not caught on the side of the white key 2a (protrusion 20) and is easily fitted into the fitting hole 24, so that the workability of the mounting member 6 can be improved.

[0141] In addition, the imaginary line Vc is a straight line passing through the center C of the circular mounting member 6 in a side view. That is, the second protrusions 62 and 63 protrude in opposite directions across the center C of the mounting member 6. Therefore, for example, if the first protrusion 61 is omitted and the second protrusion 62 is directly formed on the outer peripheral surface of the mounting member 6, the outer shape of the mounting member 6 including the second protrusions 62 and 63 becomes a shape having rotational symmetry around the center C (axis along the scale direction). If the mounting member 6 has a rotationally symmetric shape, it is difficult for the operator to recognize which of the second protrusions 62 and 63 should be inserted into the fitting holes 25 and 26, that is, in what direction the mounting member 6 should be installed in the mounting hole 21.

[0142] In contrast, in the present embodiment, the outer shape of the mounting member 6 including the protrusions 61 to 63 is a shape that does not have rotational symmetry about the center C (the axis along the scale direction). That is, the second protrusion 62 is formed overlapping the first protrusion 61, and on the other hand, the second protrusion 63 is directly formed on the outer peripheral surface of the mounting member 6. Therefore, by comparing the shape of the mounting member 6 (the protrusions 61 to 63) with the shape of the mounting hole 21 (the fitting holes 24 to 26), it is easy to identify in which direction the mounting member 6 should be mounted in the mounting hole 21.

[0143] In addition, the height of the second protrusion 62 from the outer peripheral surface of the mounting member 6 increases corresponding to the formation of the second protrusion 62 overlapping the first protrusion 61. Figure 8B As shown, the mounting member 6 is Fig. 8A In the state in which the mounting member 6 is reversed 180° about the center C, even if it is desired to make the mounting member 6 protrude by the total protrusion dimension L1+L2 of the second protrusion 62 and the second protrusion 63 ( Fig. 8A The second protrusion 62 is also easily caught on the side of the white key 2a (protrusion 20) while being elastically deformed (as shown in the figure). This can prevent the installation member 6 from being inserted into the installation hole 21 in the wrong direction.

[0144] On the other hand, for example, when the mounting member 6 is made to have a protrusion dimension L1+L2 of the second protrusions 62 and 63 plus a protrusion dimension L3 of the first protrusion 61 (see Figure 7B ), that is, when the mounting member 6 is excessively elastically deformed, there is a concern that the second protrusion 62 will not be caught on the side of the white key 2a (protrusion 20) and the mounting member 6 can be inserted into the mounting hole 21. Such excessive elastic deformation of the mounting member 6 is limited by the partition wall 64 of the mounting member 6.

[0145] Specifically, a plate-shaped partition wall 64 extending from the inner peripheral surface of the guide groove 60 is formed in a substantially central portion of the inner peripheral surface of the guide groove 60 in the musical scale direction (arrow LR direction). In other words, the guide groove 60 is formed as a pair of side surfaces on both sides of the mounting member 6 in the musical scale direction with the partition wall 64 therebetween, and the pair of guide grooves 60 are divided by the partition wall 64.

[0146] The partition wall 64 has an opening 65 extending along the guide groove 60. Therefore, when the mounting member 6 is compressed so as to recess the second protrusions 62 and 63 as described above (see Fig. 8A ), elastic deformation of the mounting member 6, such as narrowing the groove width of the guide groove 60, can be allowed.

[0147] The opening width L4 of the opening 65 in the direction along the imaginary line Vc (see Figure 7B ) is formed to be larger than the total protrusion dimension L1+L2 of the second protrusion 62 and the second protrusion 63 (L4>L1+L2). According to the opening width L4 of the opening 65, the mounting member 6 can be in a correct posture ( Fig. 8A state) is installed in the mounting hole 21.

[0148] On the other hand, the opening width L4 of the opening 65 is formed to be smaller than the total protrusion dimension L1+L2+L3 of the first protrusion 61 and the second protrusion 62 and the second protrusion 63 (L4<L1+L2+L3). Figure 8BThe mounting member 6 is inserted into the mounting hole 21 in a state of being inserted into the mounting hole 21, and the edges of the opening 65 (partition wall 64) contact each other, thereby limiting the excessive elastic deformation of the mounting member 6 such that the second protrusion 62 can be inserted into the fitting hole 26. Thus, it is possible to prevent the mounting member 6 from being mounted in the mounting hole 21 in an incorrect posture.

[0149] Here, as described above, the starting point P1 (see Figure 2 The enlarged part), the end point P2 (refer to Figure 3 The enlarged portion) is located on an imaginary circle Vb centered on the imaginary axis Va, but the position of the imaginary axis Va is set to different positions in the key 2 on the bass side and the key 2 on the treble side. Figures 9A to 9C Provide explanation.

[0150] Fig.9A is a side view of the white key 2a located on the highest pitch side, Fig. 9B is a side view of the white key 2a located on the lowest note side, Fig. 9C It is a top view of the key 2 schematically showing the position of the virtual axis Va of each white key 2a.

[0151] like Fig.9A and Fig. 9C As shown, in the white key 2a located on the highest pitch side and having the note name C8, the start point P1 and the end point P2 of the guide groove 60 are formed around an imaginary circle VbH centered on an imaginary axis VaH relatively close to the white key 2a.

[0152] On the other hand, Fig. 9B and Fig. 9C As shown, in the white key 2a with the note A0 located on the lowest tone side, the starting point P1 and the end point P2 of the guide groove 60 are formed around an imaginary circle VbL centered on an imaginary axis VaL which is farther from the white key 2a than the white key 2a with the note C8.

[0153] Moreover, if Fig. 9C As shown, the imaginary axis Va of each white key 2a arranged in the scale direction is set at a different position among each white key 2a. That is, the angle of the guide groove 60 of each key 2 is different among each white key 2a or each black key 2b, so that each key 2 can be swung with different displacement trajectories without changing the dimensions of each white key 2a or black key 2b in the front-back direction. Therefore, unlike the structure of changing the displacement trajectory of each key by changing the full length of each key as in the prior art (for example, Japanese Patent Laid-Open No. 2015-034853), it is not necessary to extend the full length of a part of the keys 2, so the size of the keyboard device 1 can be suppressed.

[0154] In addition, in the present embodiment, the position of the imaginary axis Va of each white key 2a arranged in the scale direction gradually (proportionally) approaches the white key 2a from the white key 2a on the bass side to the white key 2a on the treble side. That is, the angle of the guide groove 60 with respect to the vertical direction gradually increases from the white key 2a on the bass side to the white key 2a on the treble side. Thus, each white key 2a can be swung with a displacement trajectory close to that of an acoustic grand piano.

[0155] In this way, the structure in which the guide grooves 60 are set at different angles between the white keys 2a or the black keys 2b can also be applied to the case where the guide grooves 60 are formed integrally with the white keys 2a. However, if the angle of the guide grooves 60 formed integrally with the white keys 2a is changed, the mold for molding each white key 2a becomes complicated, and the manufacturing cost of the white keys 2a increases.

[0156] In contrast, the present embodiment is a structure in which the mounting member 6 having the guide groove 60 formed on the side surface is mounted on the white key 2a (protruding portion 20). Thus, compared with the case where the angle of the guide groove 60 formed integrally with the white key 2a is changed as described above, the mold for molding the white key 2a can be simplified, thereby reducing the manufacturing cost of the white key 2a.

[0157] In addition, since the mounting member 6 having the common outer shape (the protrusions 61 to 63) is mounted on each white key 2a, the shape of the mounting hole 21 can also be common to each white key 2a. Thus, the types of molds used to form each white key 2a can be reduced, thereby reducing the manufacturing cost of the white key 2a.

[0158] Furthermore, the mounting member mounted on each black key 2b may have the same outer shape as the mounting member 6 mounted on the white key 2a, or may have a different outer shape. In either case, it is preferred that the mounting member having the same outer shape except for the shape (angle) of the guide groove is mounted on each black key 2b. Thus, the shape of the mounting hole for mounting the mounting member can be made common to each black key 2b, thereby reducing the types of molds used to form each black key 2b.

[0159] As described above, the outer shape of the mounting member 6 including the first protrusion 61 is a shape that does not have rotational symmetry about the center C of the mounting member 6. This can prevent the mounting member 6 from being mounted in the mounting hole 21 in an incorrect orientation (angle), and thus the angle of the guide groove 60 in each white key 2a can be reliably set to a target angle.

[0160] Here, when the imaginary axis Va is set at different positions in the white keys 2a on the bass side and the white keys 2a on the treble side, a difference will occur in the stroke amount of the tip end portion of each white key 2a. Figure 2 and Figures 9A to 9C Provide explanation.

[0161] like Figure 2 As shown in FIG. 1 , the swing of the portion of the white key 2a closer to the front end side (arrow F side) than the guide groove 60 is guided by the rotation of the hammer 7 around the rotation axis 43 as described above. In addition, the terminal position of the swing is determined by the contact between the hammer 7 and the stopper 48. The stopper 48 is a cushioning material made of felt or foamed polyurethane fixed to the chassis 4 on the upper side of the mass portion 70 of the hammer 7.

[0162] The position of the rotation axis 43 of the hammer 7 or the engagement position of the hammer 7 and the white key 2a (the lower end of the protrusion 22) is the same for each white key 2a arranged in the scale direction (for example, the rotation axis 43 of each hammer 7 is arranged in the scale direction). Therefore, when the rotation angle of the hammer 7 until it contacts the stopper 48 is constant for each white key 2a, the stroke amount of the white key 2a (the lower end of the protrusion 22) at the engagement position with the hammer 7 is the same for each white key 2a.

[0163] On the other hand, as described above, the swinging of the rear end portion of each white key 2a is guided by the guide groove 60, and as shown in FIG. Fig. 9B As shown in FIG. 1 , in the white key 2a on the bass side, the angle of the guide groove 60 relative to the vertical direction is relatively small (the imaginary axis Va is relatively far away). Fig. 9C As shown, in the white key 2a on the high pitch side, the angle of the guide groove 60 with respect to the vertical direction is relatively large (the virtual axis Va is relatively close).

[0164] Therefore, at the hammer 7 Figure 2 When the rotation angle until the stopper 48 contacts is constant in each white key 2a, the stroke amount of the rear end portion of each white key 2a from the initial position before the key is pressed to the terminal position of the key (the sliding amount of the guide groove 60 relative to the shaft portion 41) becomes smaller in the white key 2a on the high pitch side compared with the white key 2a on the low pitch side. If the stroke amount of the rear end portion of the white key 2a is relatively small, the stroke amount of the front end portion of the white key 2a (the portion further forward than the engagement position with the hammer 7) becomes large (the angle of the white key 2a at the terminal position of the key is relatively large with respect to the horizontal direction).

[0165] That is, when the rotation angle of the hammer 7 to the terminal position of the key is set to be constant in each white key 2a, and the distance to the imaginary axis Va is set closer in the white keys 2a on the treble side than in the white keys 2a on the bass side, the stroke amount of the tip end of the white keys 2a on the treble side becomes larger than that of the white keys 2a on the bass side. If there is a difference in the stroke amount of the tip end of each white key 2a, it is impossible to provide a good playing feeling to the player.

[0166] For a structure for solving the above-mentioned problem, refer to Fig.10 Provide explanation. Fig.10is with Figure 2 A partially enlarged cross-sectional view of the keyboard device 1 at a position corresponding to the X portion. Fig.10 , a cross section including the stopper 48H located on the highest pitch side (corresponding to the white key 2a with the note name C8) is shown, but the hatching of the stopper 48H is omitted to simplify the drawing.

[0167] like Fig.10 As shown in the figure, the stopper 48 located on the lowest pitch side (corresponding to the white key 2a with the note name A0) is set as the stopper 48L, and the stopper located on the highest pitch side (corresponding to the white key 2a with the note name C8) is set as the stopper 48H. The thickness of the stopper 48H is formed thicker than the thickness of the stopper 48L. And, although the figure is omitted, the thickness of the stopper 48 is configured to gradually (proportionally) become thicker from the stopper 48L of the white key 2a on the lowest pitch side to the stopper 48H of the white key 2a on the highest pitch side.

[0168] That is, the interval between the mass portion 70 (the portion that contacts the stopper 48 when the white key 2a is pressed) in the rotation direction of the hammer 7 and the stopper 48 gradually narrows from the white key 2a on the bass side to the white key 2a on the treble side. As a result, the rotation angle of the hammer 7 until the hammer 7 contacts the stopper 48 when the white key 2a is pressed can be reduced in the white key 2a on the treble side compared with the white key 2a on the bass side. As a result, as described above, even if the distance to the imaginary axis Va is set closer in the white key 2a on the treble side than in the white key 2a on the bass side, the stroke amount of the front end portion of each white key 2a can be made uniform. As a result, a good playing feeling can be provided to the performer.

[0169] In addition, in the present embodiment, the stroke amount of the front end portion of each white key 2a is made uniform by changing the thickness of the stopper 48, but it is not necessarily limited to this. For example, the following structure may be adopted: the thickness of the stopper 48 of each white key 2a is made the same in each white key 2a, and the thickness of the mass portion 70 of the hammer 7 in the vertical direction is gradually (proportionally) thickened from the bass side to the treble side. In the above structure, the interval between the mass portion 70 and the stopper 48 in the rotation direction of the hammer 7 may be formed so as to gradually narrow from the white key 2a on the bass side to the white key 2a on the treble side.

[0170] Next, refer to Figures 11A to 11C A modification example of the arrangement of the virtual axis Va will be described. Fig.11A is a top view of the key 2 schematically showing the position of the imaginary axis Va in the first modification example, Fig. 11B is a top view of the key 2 schematically showing the position of the imaginary axis Va in the second modification example, Fig. 11C It is a top view of the key 2 schematically showing the position of the virtual axis Va in the third modification.

[0171] like Fig.11A As shown, in the first variation of the imaginary axis Va, the imaginary axis VaH of the white key 2a on the highest pitch side (note name C8) is set at a position farther from the white key 2a than the imaginary axis VaL of the white key 2a on the lowest pitch side (note name A0). Moreover, it is configured so that the imaginary axis Va gradually (proportionally) moves away from the white key 2a from the bass side to the treble side. Thus, the displacement trajectory of the white key 2a can be gradually changed from the white key 2a on the bass side to the white key 2a on the treble side. As described above, this distance from the white key 2a to the imaginary axis Va can be adjusted by changing the guide groove 60 (refer to Figures 9A to 9C ) to adjust the angle. The same is true in the following other modified examples.

[0172] like Fig. 11B As shown, in the second modified example of the imaginary axis Va, the distance from the white key 2a is the same between the imaginary axis VaL of the white key 2a on the lowest pitch side and the imaginary axis VaH of the white key 2a on the highest pitch side. On the other hand, compared with these imaginary axes VaL and VaH, the imaginary axis VaM of the white key 2a in the middle range (for example, the note name is E4) is set to a position closer to the white key 2a. Moreover, the imaginary axis Va is configured to gradually (in a quadratic function) approach the white key 2a from the white key 2a on the bass side and the treble side to the white key 2a in the middle range. As a result, the displacement trajectory of the white key 2a can be gradually changed from the white key 2a on the bass side and the treble side to the white key 2a in the middle range.

[0173] like Fig. 11C As shown, in the third modification of the imaginary axis Va, the imaginary axis Va gradually (stepwise) approaches the white key 2a from the imaginary axis VaL of the lowest pitch side white key 2a to the imaginary axis VaH of the highest pitch side white key 2a.

[0174] More specifically, the range of each white key 2a is divided (equally divided) into four ranges, and each white key 2a on the middle range side (e.g., the notes F2 to E4) is set closer to the imaginary axis Va than each white key 2a on the lowest range side (e.g., the notes A0 to E2). On the other hand, each white key 2a constituting the same divided area (e.g., the notes A0 to E2) has the same distance from the imaginary axis Va.

[0175] Similarly, the white keys 2a in the highest pitch range (for example, with note names F6 to C8) are set at positions close to the imaginary axis Va compared to the white keys 2a on the higher pitch side in the middle range (for example, with note names F4 to E6), but the distances from the white keys 2a constituting the same divided area (for example, with note names F4 to E6) to the imaginary axis Va are the same.

[0176] In this way, the virtual axis Va is gradually approached from the white key 2a on the low pitch side to the white key 2a on the high pitch side, which is different from the above embodiment (see Fig. 9C ) Similarly, each white key 2a can be swung in a displacement trajectory close to that of an acoustic grand piano. Furthermore, since the position of the imaginary axis Va gradually approaches the white key 2a from the bass side to the treble side, the angle of the guide groove 60 relative to the vertical direction can also be gradually increased from the white key 2a on the bass side to the white key 2a on the treble side. Thus, for white keys 2a having the same position of the imaginary axis Va (for example, the notes A0 to E2), it is sufficient to set the angle of the guide groove 60 to be the same, so that the mounting member 6 mounted on each of the white keys 2a can be made common. Thus, the types of mounting members 6 used can be reduced, and thus the manufacturing cost of the mounting member 6 can be reduced.

[0177] Next, refer to Fig. 12A , Fig. 12B , the white key 502a of the fourth modification example will be described. In addition, the same reference numerals are given to the same parts as those in the above-mentioned embodiment, and the description thereof will be omitted. Fig. 12A is a side view of a white key 502a of the fourth modification example, Fig. 12B It is a perspective view showing the white key 502 a in a state where the mounting member 506 is removed from the mounting hole 521 .

[0178] like Fig. 12A , Fig. 12B As shown, the white key 502a of the fourth modified example is similar to the white key 2a described in the above embodiment (see FIG. 1 ), except that the inner peripheral surface of the mounting hole 521 is elliptical. Figures 9A to 9C That is, the mounting hole 521 of the white key 502a is formed with the same fitting holes 24 to 26 as those of the white key 2a.

[0179] The mounting member 506 mounted on the mounting hole 521 has the same structure as the mounting member 6 described in the above embodiment, except that the outer shape is an ellipse (a shape corresponding to the mounting hole 521) along the shape of the guide groove 60. That is, the mounting member 506 is formed with a first protrusion 61, a second protrusion 62, a second protrusion 63, and a partition wall 64 (opening 65).

[0180] The mounting member 506 is formed of a soft material having a lower hardness than the resin used as the material of the white key 502a, so that the guide groove 60 along the shaft portion 41 (see Figure 3 ) produces noise when sliding.

[0181] Here, in the above-described embodiment, the case where the angle of the guide groove 60 is set to be different between the white keys 2a (or the black keys 2b) has been described, but in the embodiment described above, Fig. 12A , Fig. 12BIn the illustrated modification, the angle of the guide groove 60 is set to the same angle in all white keys 502a arranged in the scale direction. That is, mounting holes 521 of a common shape are formed in each white key 502a, and common mounting members 506 are mounted in these mounting holes 521.

[0182] Furthermore, if the straight line connecting the centers of the second protrusions 62 and the second protrusions 63 in the direction around the outer circumference of the mounting member 506 is set as an imaginary line Vc, the outer shape of the mounting member 506 is a line-symmetrical shape with the imaginary line Vc as the axis of symmetry when viewed from the side. In addition, the shape of the guide groove 60 is also a line-symmetrical shape with the imaginary line Vc as the axis of symmetry when viewed from the side. That is, the mounting member 506 is a rotationally symmetrical (twice symmetrical) shape with the imaginary line Vc as the axis, and can be mounted in the mounting hole 521 even if the front and back of the mounting member 506 are reversed 180° around the imaginary line Vc. Thus, for all the white keys 502a arranged in the scale direction, the mounting member 506 can be mounted regardless of the front and back of the mounting member 506 around the imaginary line Vc. Thus, the workability of the mounting member 506 can be improved.

[0183] In addition, such a rotationally symmetrical (twice symmetrical) shape with the imaginary line Vc as the symmetry axis can also be applied to each mounting member 6 of the above-mentioned embodiment (see Fig.9A and Fig. 9B In this case, by gradually changing the shape of the mounting hole 21 (the position of each fitting hole 24 to 26), that is, the mounting angle of the mounting member 6 from the white key 2a on the bass side to the white key 2a on the treble side, the angle of the guide groove 60 (the position of the imaginary axis Va) can be changed in the same manner.

[0184] Next, refer to Fig.13A , Fig. 13B , the white key 602a of the fifth variation example is described. Fig.13A is a perspective view of a white key 602a according to a fifth modification example. Fig. 13B It is a perspective view showing the white key 602 a in a state where the mounting member 606 is removed from the protruding portion 620 .

[0185] like Fig.13A , Fig. 13B As shown, the protrusion 620 of the white key 602a of the fifth modified example is formed in a plate shape (rectangular parallelepiped shape) extending in the front-back direction (arrow FB direction), and a mounting member 606 is mounted on the protrusion 620. The mounting member 606 is formed in a square tube shape having an insertion hole 666 extending in the front-back direction, and the guide groove 60 passes through the side surface of the mounting member 606 in the scale direction (arrow LR direction).

[0186] The dimensions of the protrusion 620 in the up-down direction and the scale direction are formed to be the same as (or slightly smaller than) the dimensions of the insertion hole 666 in the above directions, and the mounting member 606 is mounted on the white key 602a by inserting the protrusion 620 into the insertion hole 666 of the mounting member 606. Thus, it is not necessary to form a hole for mounting the mounting member 606 in the protrusion 620, so that the rigidity of the protrusion 620 can be ensured.

[0187] The mounting member 606 is formed of a soft material having a lower hardness than the resin used as the material of the white key 602a, so that the guide groove 60 can be prevented from being deformed along the shaft portion 41 (see Figure 3 ) produces noise when sliding.

[0188] The white key 602a is provided with a first limiting portion 627 and a second limiting portion 628, which limit the front-rear displacement of the mounting member 606 mounted on the protrusion 620. The first limiting portion 627 is a portion whose dimensions in the scale direction and the up-down direction are larger than those of the protrusion 620. Since the protrusion 620 protrudes to the rear side from the rear surface of the first limiting portion 627, the displacement of the mounting member 606 to the front side is limited by the first limiting portion 627 when the mounting member 606 is mounted on the protrusion 620.

[0189] On the other hand, a second limiting portion 628 is formed on the rear end side of the protrusion 620. The second limiting portion 628 is a protrusion extending up and down, and protrudes from the side surfaces of the protrusion 620 on both sides in the scale direction. The rear surface of the second limiting portion 628 is an inclined surface that tilts toward the front side as it moves toward the outside in the scale direction. Therefore, when the protrusion 620 is inserted into the insertion hole 666 of the mounting member 606, the mounting member 606 (insertion hole 666) is stretched along the rear surface of the inclined second limiting portion 628, and the mounting member 606 passes over the second limiting portion 628, thereby mounting the mounting member 606 on the protrusion 620.

[0190] The dimension from the rear surface of the first limiting portion 627 to the second limiting portion 628 is substantially the same as the front-to-back direction of the mounting member 606, and the front-to-back displacement of the mounting member 606 is limited by sandwiching the mounting member 606 between the limiting portions 627 and 628. Thus, it is not necessary to attach the mounting member 606 to the white key 602a, and it is possible to prevent the mounting member 606 from falling off the protruding portion 620.

[0191] Although the above description has been given based on the above embodiment, the present invention is not limited to the above embodiment at all, and it can be easily estimated that various improvements and modifications can be made without departing from the gist of the present invention.

[0192] In the above embodiment, the case where the mounting member 6, the mounting member 506, and the mounting member 606 having the guide groove 60 are mounted on the white key 2a, the white key 202a, the white key 302a, the white key 402a, the white key 502a, and the white key 602a is described, but the present invention is not necessarily limited to this. For example, the guide groove 60 may be formed integrally with the white key 2a, the white key 202a, the white key 302a, the white key 402a, the white key 502a, and the white key 602a.

[0193] In the above embodiment, the guide groove 60 of the mounting member 6, mounting member 506, mounting member 606 mounted on the white key 2a, white key 202a, white key 302a, white key 402a, white key 502a, white key 602a is slidably engaged with the shaft portion 41 of the chassis 4, but the present invention is not necessarily limited to this. For example, the guide groove 60 may be formed on the chassis 4, and a guide shaft that can slide in the guide groove 60 may be formed on the white key 2a, white key 202a, white key 302a, white key 402a, white key 502a, white key 602a. In the case of such a structure, a mounting hole that can mount a member corresponding to the mounting member 6, mounting member 506, mounting member 606 may be formed on the chassis 4 (wall portion 40), or the guide groove 60 may be directly formed on the wall portion 40.

[0194] In the above embodiment, the case where a gap is formed between the inclined surface 20c1, the inclined surface 420h1 and the curved surface 20c2, the curved surface 420h2 of the guided surface 20c, the guided surface 420h and the guide surface 46c, the guide surface 447a is described, but the present invention is not necessarily limited to this. For example, the entire inclined surface 20c1, the inclined surface 420h1 (or a part of the upper end side) may be formed to be parallel to the guide surface 46c, the guide surface 420h and to be in surface contact with the guide surface 46c, the guide surface 447a, and the gap is formed only between the curved surface 20c2, the curved surface 420h2 and the guide surface 46c, the guide surface 447a. In addition, the curved surface 20c2, the curved surface 420h2 may be omitted, and the guided surface 20c, the guided surface 420h may be formed only by the inclined surface 20c1, the inclined surface 420h1. That is, as long as a gap is formed between the guided surfaces 20c and 420h and the guide surfaces 46c and 447a at least in the region including the lower ends of the guided surfaces 20c and 420h, the grease can be prevented from being scraped off.

[0195] In the above-described embodiment, the case where the mounting member 6, the mounting member 506, and the mounting member 606 (guide groove 60) are formed using a material having a lower hardness than the white key 2a is described, but the present invention is not necessarily limited to this. For example, the shaft portion 41 (guide shaft) of the chassis 4 may also be formed using a material having a lower hardness than the white key 2a. In this case, the mounting member 6, the mounting member 506, and the mounting member 606 (guide groove 60) may also be formed using a material having a lower hardness than the white key 2a, or the hardness of the mounting member 6, the mounting member 506, and the mounting member 606 (guide groove 60) may be the same as (or higher than) the white key 2a. In addition, the hardness of the mounting member 6, the mounting member 506, the mounting member 606 (guide groove 60) and the shaft portion 41 (guide shaft) may be the same, or the hardness of any one of them may be higher than the other.

[0196] In the above embodiment, the case where the outer shape of the mounting member 6 and the mounting member 506 is circular or elliptical is described, but the outer shape of the mounting member 6 and the mounting member 506 may be polygonal, or may be a shape formed by combining circles or polygons. That is, as long as the guide groove 60 is included, the shape of the mounting member 6 and the mounting member 506 may be appropriately set.

[0197] In the above-described embodiment, the case where the mounting member 6 and the mounting member 506 are mounted on the mounting hole 21 and the mounting hole 521 by fitting the protrusions 61 to 63 of the mounting member 6 and the mounting member 506 with the fitting holes 24 to the fitting holes 26 of the mounting hole 21 and the mounting hole 521 has been described, but the present invention is not necessarily limited to this. For example, any one or all of the protrusions 61 to 63 (fitting holes 24 to the fitting holes 26) may be omitted and the mounting member 6 and the mounting member 506 may be attached to the mounting hole 21 and the mounting hole 521. In addition, a convex portion corresponding to each protrusion 61 to 63 may be provided on the mounting hole 21 and the mounting hole 521 side, and a concave portion corresponding to the fitting holes 24 to the fitting holes 26 may be provided on the mounting member 6 and the mounting member 506 on the other side.

[0198] In the above embodiment, the case where the change of the installation angle of the mounting member 6 relative to the mounting hole 21 is restricted by the fitting of the fitting hole 24 and the first protrusion 61 is described, but the present invention is not necessarily limited to this. For example, the fitting hole 24 and the first protrusion 61 may be omitted and the change of the installation angle of the mounting member 6 may be restricted by fitting one or both of the second protrusions 62 and 63 with the fitting holes 25 and 26. In this case, the size of the fitting holes 25 and 26 in the circumferential direction of the mounting hole 21 may be formed to be the same as (or slightly larger than) the size of the second protrusions 62 and 63 in the above direction.

[0199] In the above embodiment, the case where the imaginary line Vc connecting the second protrusion 62 and the second protrusion 63 (the first protrusion 61) intersects with the guide groove 60 in a side view, or the case where the first protrusion 61 is formed on the imaginary line Vc is described, but it is not necessarily limited to this. For example, the imaginary line Vc may not intersect with the guide groove 60, or the first protrusion 61 may be formed at a position that does not overlap with the imaginary line Vc. That is, the formation positions of the protrusions 61 to 63 on the outer peripheral surface of the mounting member 6 or the mounting member 506 can be appropriately set.

[0200] In the above embodiment, the case where the fitting hole 24 is formed along the edge of the opening side (outer side in the scale direction) of the mounting hole 21 is described, but it is not necessarily limited to this. For example, a wall may be formed on the outer side edge in the scale direction of the fitting hole 24, and the mounting member 6 is restricted from falling off by the hooking of the wall and the first protrusion 61. In this case, the second protrusion 62 and the second protrusion 63 (fitting hole 25 and fitting hole 26) may also be omitted.

[0201] In the above embodiment, the guide groove 60 is described as being formed in a straight line from the starting point P1 to the end point P2. However, the guide groove 60 may be formed in an arc shape from the starting point P1 to the end point P2.

[0202] In the above embodiment, the outer peripheral surface of the shaft portion 41 contacts only the sliding surface of the guide groove 60 in each of the initial position before the key is pressed and the terminal position of the key, but the present invention is not necessarily limited to this. For example, the outer peripheral surface of the shaft portion 41 may contact the inner peripheral surface of the lower end side or the upper end side of the guide groove 60 in either or both of the initial position before the key is pressed or the terminal position of the key.

[0203] In the above embodiment, the case where the opening 65 is formed in the partition wall 64 that divides the guide groove 60 is described, but the partition wall 64 or the opening 65 may be omitted. In addition, the case where the opening width L4 of the opening 65 is formed to be smaller than the total protrusion dimension L1+L2+L3 of the first protrusion 61 and the second protrusion 62, 63 is described, but the opening width L4 of the opening 65 may be formed to be the same as (or smaller than) the total protrusion dimension L1+L2+L3 of the first protrusion 61 and the second protrusion 62, 63 (as long as it is at least larger than the protrusion dimension L1+L2 of the second protrusion 62, 63).

[0204] In the embodiment, the outer shape of the mounting member 506 (the shape of the guide groove 60) is described as a line-symmetrical shape with the imaginary line Vc as the axis of symmetry when viewed from the side, but the outer shape of the mounting member 506 (the shape of the guide groove 60) may be an asymmetrical shape with the imaginary line Vc as the axis.

[0205] In the above embodiment, the case where the interval between the mass portion 70 (the portion that contacts the stopper 48 when the white key 2a is pressed) in the rotation direction of the hammer 7 and the stopper 48 gradually narrows from the white key 2a on the bass side to the white key 2a on the treble side is described, but the present invention is not necessarily limited to this. For example, the interval between the mass portion 70 and the stopper 48 in the rotation direction of the hammer 7 may be constant from the white key 2a on the bass side to the white key 2a on the treble side.

Claims

1. A keyboard device, characterized in that: comprising a supporting member, and a key supported by the supporting member in a swingable manner, Either the support member or the key includes a guide groove that guides the swing of the rear portion of the key. Either the supporting member or the key includes a guide shaft extending in a scale direction and inserted into the guide groove, and sliding along the guide groove when the key swings, At least one of the guide groove and the guide shaft is formed using a material that is softer than the key.

2. The keyboard device according to claim 1, characterized in that: In each of an initial position of the key before key pressing and a terminal position of the key pressing, the outer peripheral surface of the guide shaft contacts only the sliding surface of the guide groove.

3. The keyboard device according to claim 1, characterized in that: The mounting member is provided, and the mounting member is mounted on the supporting member or the key, and the guide groove is formed on a side surface thereof.

4. The keyboard device according to claim 3, characterized in that: The supporting member or the key includes a mounting hole configured to allow the mounting member to be inserted along a scale direction.

5. The keyboard device according to claim 4, characterized in that: The key includes the mounting hole.

6. The keyboard device according to claim 4, characterized in that: A positioning portion including a concave portion and a convex portion that can fit together is formed on the inner circumferential surface of the mounting hole and the outer circumferential surface of the mounting member. The positioning portion restricts a change in the mounting angle of the mounting member in a direction around the inner peripheral surface of the mounting hole.

7. The keyboard device according to claim 6, characterized in that: The recessed portion of the positioning portion is formed at an outer edge of the mounting hole or the mounting member in a scale direction.

8. The keyboard device according to claim 4, characterized in that: A restricting portion including a concave portion and a convex portion that can fit together is formed on the inner circumferential surface of the mounting hole and the outer circumferential surface of the mounting member. The attachment member is restricted from falling off from the attachment hole in the scale direction by the restriction portion.

9. The keyboard device according to claim 8, characterized in that: A pair of the limiting portions are formed on the outer peripheral surface of the mounting member, The guide groove intersects with an imaginary line connecting the pair of restriction portions in a side view of the mounting member.

10. The keyboard device according to claim 9, characterized in that: A positioning portion including a concave portion and a convex portion that can fit together is formed on the inner circumferential surface of the mounting hole and the outer circumferential surface of the mounting member. The change of the mounting angle of the mounting member in the direction around the inner peripheral surface of the mounting hole is restricted by the positioning portion. The recessed portion of the positioning portion is formed on the outer edge of the mounting hole or the mounting member in the scale direction. The positioning portion is formed at a position overlapping the imaginary line.

11. The keyboard device according to claim 9, characterized in that: The mounting member includes a partition wall, the partition wall dividing a pair of guide grooves formed on both sides of the mounting member in the scale direction. The partition wall has an opening formed along the guide groove.

12. The keyboard device according to claim 11, characterized in that: A positioning portion including a concave portion and a convex portion that can fit together is formed on the inner circumferential surface of the mounting hole and the outer circumferential surface of the mounting member. The change of the mounting angle of the mounting member in the direction around the inner peripheral surface of the mounting hole is restricted by the positioning portion. The recessed portion of the positioning portion is formed on the outer edge of the mounting hole or the mounting member in the scale direction. The positioning portion is formed at a position overlapping with the imaginary line, The size of the opening is formed to be smaller than the total size of the convex portion of the restricting portion and the convex portion of the positioning portion in the direction along the imaginary line.

13. The keyboard device according to claim 9, characterized in that: The shape of the guide groove and the outer shape of the mounting member are line-symmetrical shapes with the imaginary line as a symmetry axis in a side view.

14. The keyboard device according to claim 3, characterized in that: The mounting member is mounted on the key by inserting the rear end portion of the key into the cylindrical mounting member.

15. A method for guiding keys in a keyboard device, wherein: The keyboard device includes a supporting member and a key supported by the supporting member in a swingable manner. Either the support member or the key includes a guide groove that guides the swing of the rear portion of the key. Either the supporting member or the key includes a guide shaft extending in a scale direction and inserted into the guide groove, At least one of the guide groove and the guide shaft is formed using a material that is softer than the key. The key guiding method is characterized in that the swing of the key when the key is pressed is guided by the sliding of the guide groove and the guide shaft.

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