keyboard instruments

Abstract

To provide a keyboard instrument that comprises a key base member of good quality to which fitting members can be fitted.SOLUTION: A keyboard instrument 10 has: a key base member 300 which includes a top surface as an upper surface 301p of a top plate 301 and a vertical plate 380 as a top surface support member provided while hung from an undersurface 301q of the top surface; and fitting members (first member 310, second member 320) which are provided on side faces 381, 382 of the vertical plate 380 as the top surface support member. The vertical plate 380 includes a thick part 386 having a first thickness in an array direction LR of keys and a thin part 385 having a second thickness less than the first thickness at different length-directional positions of the key base member 300. An area of contact of the thick part 386 with the fitting members is larger than an area of contact of the thin part 385 with the fitting members.SELECTED DRAWING: Figure 7

Description

[Technical Field]

[0001] The present invention relates to keyboard instruments. [Background technology]

[0002] Conventionally, keyboard instruments have been proposed that have keys with mounting members such as wood-grain parts or wooden parts attached to the key base. For example, in Patent Document 1, a planar wooden part is provided in correspondence with the wide part of the top plate of the key base. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2018-112763 Summary of the Invention [Problem to be solved by the invention]

[0004] Mounting members, such as wooden members, may be thick depending on the purpose of the mounting. Furthermore, it may be necessary to provide a mounting hole not only on the side corresponding to the wide portion of the key base member, but also on the side corresponding to the narrow portion. In such cases, the distance between the side panels, which form both the left and right sides, becomes narrow. Therefore, if the key base member is manufactured by resin injection molding, it is difficult to create a mold with a thin core block to be inserted between the two narrow side panels. Furthermore, the thickness of both side panels may become extremely thin, making injection molding difficult. Therefore, there is a concern that it may become difficult to provide high-quality key base members.

[0005] SUMMARY OF THE INVENTION An object of the present invention is to provide a keyboard instrument that has a high-quality key base member to which a mounting member can be attached. [Means for solving the problem]

[0006] The keyboard instrument according to the present invention has a top surface, a key base member including a top surface support portion provided under the top surface, and an attachment member disposed on a side surface of the top surface support portion, On the bottom Established First groove and the above First groove Located below the The bottom opens in two A lower opening; and a thick portion having a first thickness or a thin portion having a second thickness that is thinner than the first thickness in the key arrangement direction is provided from the lower edge of the first groove portion to the starting point of the fork of the lower opening portion. Have a key. [Effects of the Invention]

[0007] According to the present invention, it is possible to provide a keyboard instrument that is provided with a high-quality key base member to which a mounting member can be attached. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a perspective view showing a keyboard instrument according to an embodiment of the present invention; [Figure 2] 2 is a cross-sectional view of the keyboard instrument according to the embodiment of the present invention taken along line II-II in FIG. 1, showing the side view of the white keys and black keys. [Figure 3] 1 is an exploded perspective view showing a white key of a keyboard instrument according to an embodiment of the present invention; [Figure 4] FIG. 2 is a left side view of the key base member of the keyboard instrument according to the embodiment of the present invention. [Figure 5] FIG. 2 is a right side view of the key base member of the keyboard instrument according to the embodiment of the present invention. [Figure 6] FIG. 2 is a perspective view of a white key of the keyboard instrument according to the embodiment of the present invention, seen from below. [Figure 7] 7 is a cross-sectional view of a white key of the keyboard instrument according to the embodiment of the present invention taken along line VII-VII in FIG. 4. [Figure 8] 8 is a cross-sectional view of a white key of the keyboard instrument according to the embodiment of the present invention taken along line VIII-VIII in FIG. 4. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. The keyboard instrument 10 shown in FIG. 1 includes a full-size (88-key) keyboard 50 with a plurality of white keys 30 and a plurality of black keys 40, and a case 20. In the following description, the front of the keyboard 50 in the front-to-back direction FB is referred to as the front side F, the back of the keyboard 50 is referred to as the back side B, the left as viewed from the front of the keyboard 50 is referred to as the left side L, and the right as viewed from the front of the keyboard 50 is referred to as the right side R. The direction LR in which the keys are arranged on the keyboard 50 is the left-to-right direction. Furthermore, in the up-to-down direction UL of the keyboard instrument 10, the top is referred to as the up side Up, and the bottom is referred to as the down side Lo. While the keyboard instrument 10 of this embodiment is shown as an electronic piano, it may be any other keyboard instrument that produces sound in response to key depressions by a player (user).

[0010] The case 20 is a substantially rectangular plate with the longitudinal direction extending in the left-right direction, and is divided into an upper case 21 and a lower case 22. The upper case 21 and the lower case 22 are each made of a resin material. Inside the case 20, a circuit board, a battery serving as a power source, and the like are housed. An operation unit 11 equipped with knobs and dials for volume and various settings is provided on the top surface on the left side of the upper case 21. An earphone jack 12 is also provided on the front surface on the left side of the upper case 21.

[0011] An upper surface 21a of the upper case 21 adjacent to the keyboard 50 on the left side of the upper case 21 and an upper surface 21b of the upper case 21 adjacent to the keyboard 50 on the right side are sloped downward from the rear to the front. An upper surface 21c that is elongated in the left-right direction and provided at the upper center of the upper case 21 is also sloped. Although not shown, a hole corresponding to a speaker is provided on the back surface of the upper case 21.

[0012] As shown in FIG. 2, the case 20 is formed by combining the upper case 21 and the lower case 22, with a lower boss 23 extending from the lower case 22 and an upper boss 24 extending from the upper case 21, which are joined together with bolts. An inner case 25 is provided inside the case 20. The inner case 25 is elongated in the key arrangement direction LR, and in the cross-sectional view of FIG. 2, has a generally U-shaped cross section with its opening facing the lower side Lo. A circuit board 60 is provided on the upper surface of the inner case 25. The circuit board 60 has multiple switches 61 provided corresponding to each of the white keys 30 and each of the black keys 40. Each of the white keys 30 and each of the black keys 40 has a switch pressing portion 33 at a position corresponding to the switch 61 (FIG. 2 shows the switch pressing portion 33 of the white key 30, but the switch pressing portion of the black key 40 is not shown).

[0013] At the rear of the inner case 25, support shafts 25a are provided corresponding to each white key 30 and each black key 40, rotatably supporting the white key 30 and each black key 40. Inside the inner case 25, hammer members 70 are provided corresponding to each white key 30 and each black key 40. The hammer members 70 have weight portions 71 on the rear side B. Arm portions 72 extending from the weight portions 71 to the front side F are rotatably supported by support shafts 25b provided on the inner case 25. Hammer caps 73 are provided at the tips of the arms 72 to engage with hammer pressing portions 31 (FIG. 2 shows the hammer pressing portions 31 of the white keys 30; the hammer pressing portions of the black keys 40 are not shown) extending downward from each white key 30 and each black key 40. The hammer pressing portions 31 have holes 31a with which the hammer caps 73 engage. Each white key 30 is provided at its front end with a hook-shaped restricting protrusion 32 that extends downward (Lo) and has a tip that protrudes rearward.

[0014] The operation of the white key 30 and the hammer member 70 will be explained using the white key 30 as an example. When the white key 30 is pressed, the hammer pressing portion 31 of the white key 30 presses down the hammer cap 73. This causes the weight portion 71 of the hammer member 70, which is located opposite the hammer cap 73 across the support shaft 25b, to rise. In this way, the white key 30 can be struck with the same weight as on a real piano. The raised weight portion 71 then comes into contact with the upper cushion 26 for the hammer, which is located on the inner case 25.

[0015] On the other hand, when a white key 30 is pressed, the restriction protrusion 32 is pressed down and comes into contact with the lower cushion 29 provided corresponding to the restriction protrusion 32. When a white key 30 is pressed, the switch pressing portion 33 provided on the white key 30 presses the switch 61, and a sound corresponding to the pressed white key 30 is produced. When the white key 30 is released, the weight portion 71 of the hammer member 70 moves down and comes into contact with the lower cushion 27, and the jaw portion of the restriction protrusion 32 comes into contact with the upper cushion 28, resulting in the state shown in FIG. 2. As shown in FIGS. 4 and 5, the restriction protrusion 32 consists of a plate-shaped left restriction protrusion 32a and a plate-shaped right restriction protrusion 32b.

[0016] Next, the structure of the white key 30 will be described. The following explanation will be given with reference to Figs. 3 to 8, taking as an example a white key 30 that is a C key corresponding to the C scale. As shown in Fig. 3, the white key 30 comprises mounting members (first member 310 and second member 320) and a key base member 300. The key base member 300 is manufactured by resin injection molding. The mounting members (first member 310 and second member 320) are made of wood. The texture of the white key 30 is enhanced by attaching the mounting members (first member 310 and second member 320) to the key base member 300.

[0017] The key base member 300 is provided with the aforementioned hammer pressing portion 31, restricting protrusion 32, and switch pressing portion 33. The key base member 300 also has a step portion 305 on the right side R. The area behind the step portion 305 is a narrow section located adjacent to the black key 40, while the area in front of the step portion 305 is a wide section that includes a striking surface.

[0018] As shown in Figures 3 to 5, the key base member 300 has a top plate 301 having an upper surface 301p, which is the top surface, and a lower surface 301q. The top plate 301 has a wide portion 301a extending forward from a step 305, and a narrow portion 301b extending rearward from the step 305. A front plate 302 extends downward from the lower surface 301q at the front end of the top plate 301. The front plate 302 is arranged with its plate surface facing in the front-to-rear direction FB, and has the same width as the wide portion 301a of the top plate 301.

[0019] The key base member 300 also has left and right side plates (left plate 303 and right plate 304) that correspond to the wide portion 301a of the top plate 301. The left plate 303 and right plate 304 each hang down from the underside 301q of the top plate (in other words, the underside 301q of the top plate 301). Meanwhile, the key base member 300 has a vertical plate 380 (top surface support portion) that hangs down from the underside 301q of the top plate 301 (in other words, the underside 301q corresponding to the top surface), and extends from the rear of the step 305 to a rear plate 380a, which will be described later. Of the left and right side surfaces 381, 382 of the vertical plate 380, the side surface 381 on the left side L is provided continuous with the side surface 303a of the left plate 303 corresponding to the wide portion 301a. On the other hand, the side surface 382 on the right side R is connected to the side surface 304a of the right side plate 304 via the connecting plate 305a of the step portion 305. In other words, the side surface 304a of the right side plate 304 and the side surface 382 on the right side R of the vertical plate 380 are not continuous.

[0020] The first member 310 is formed in a plate shape having an outer shape corresponding to the side surface 303a of the left side plate 303 and the side surface 381 of the left side L of the vertical plate 380 on which it is to be placed. The first member 310 has a front portion 311 and a rear portion 312, which are continuous with each other. The length of the front portion 311 in the up-down direction UL is longer than the length of the rear portion 312 in the up-down direction UL. The upper surface 310a of the first member 310 is a continuous surface, and the lower surface 310b is stepped at the connection between the front portion 311 and the rear portion 312. The front portion 311 includes a portion that is placed on the side surface 303a of the left side plate 303, and the rear portion 312 includes a portion that is placed on the side surface 381 of the vertical plate 380.

[0021] More specifically, as shown in Figures 3 and 4, the first member 310 is positioned on the left side plate 303 and vertical plate 380 of the key base member 300, with its front surface 310c abutting against the rear surface 302c of the front plate 302 of the key base member 300, its top surface 310a abutting against the bottom surface 301q of the top plate 301, and its side surface 310e abutting against the abutment surfaces 170 of the side surfaces 303a and 381 of the left side plate 303 and vertical plate 380.

[0022] The second member 320 is formed in a plate shape having an outer shape corresponding to the right side plate 304 and vertical plate 380 to be arranged thereon. The second member 320 includes a front second member 321 having a generally rectangular plate shape that is long in the front-to-rear direction FB, and a rear second member 322 having a generally rectangular plate shape that is long in the front-to-rear direction FB. The length of the front second member 321 in the up-down direction UL is longer than the length of the rear second member 322 in the up-down direction UL. The front second member 321 is arranged on a side surface 304a of the right side plate 304, and the rear second member 322 is arranged on a side surface 382 on the right side R of the vertical plate 380.

[0023] More specifically, as shown in Figures 3 and 5, the front second member 321 of the second member 320 is positioned on the right side plate 304 of the key base member 300 with its front surface 321c abutting against the rear surface 302c of the front plate 302 of the key base member 300, its upper surface 321a abutting against the lower surface 301q of the top plate 301, and its side surface 321e abutting against the abutment surface 271 of the side surface 304a of the right side plate 304.

[0024] Similarly, the rear second member 322 of the second member 320 is positioned on the vertical plate 380 of the key base member 300 with its front surface 322c abutting the rear surface of the connecting plate 305a, its upper surface 322a abutting the lower surface 301q of the top plate 301, and its side surface 322e abutting the abutment surface 272 of the side surface 382 of the vertical plate 380.

[0025] A rear surface 310d of the first member 310 and a rear surface 322d of the rear second member 322 do not abut on a rear plate 380a (see also FIG. 6) that stands in the left-right direction at the rear end of the vertical plate 380 and faces the rear surfaces 310d, 322d, leaving a gap therebetween. A rear surface 321d of the front second member 321 of the second member 320 is open.

[0026] In addition, the side surfaces 303a, 304a of the left side plate 303 and the right side plate 304 and the side surfaces 381, 382 of the vertical plate 380 are positioned so that the side edges 301c1, 301c2, 301c3 on the left side L of the top plate 301 are substantially flush with the outer side surface 310f of the first member 310, the outer side surface 321f of the front second member 321, and the outer side surface 322f of the rear second member 322.

[0027] 4, side surfaces 303a, 381 of left side plate 303 and vertical plate 380 include first grooves 110a, 110b as recessed grooves provided along bottom surface 301q of top plate 301, and second grooves 120a, 120b provided in side surfaces 303a, 381 near the lower edges of left side plate 303 and vertical plate 380. First grooves 110a, 110b and second grooves 120a, 120b are provided with different depths and widths. First groove 110a and second groove 120a are connected to each other at their front ends, and first groove 110b and second groove 120b are connected to each other at their rear ends, by recessed grooves.

[0028] 5, the side surfaces 304a, 382 of the right side plate 304 and the vertical plate 380 respectively include first grooves 210a, 210b as recessed grooves provided along the underside 301q of the top plate 301, and second grooves 220a, 220b provided in the side surfaces 304a, 382 near the lower edges of the right side plate 304 and the vertical plate 380. The first groove 210a and the second groove 220a provided in the side surface 304a of the right side plate 304 are connected at the front and rear ends by a recessed connecting groove and are provided in a substantially rectangular ring shape. The first groove 110b and the second groove 220b provided in the side surface 382 of the vertical plate 380 are connected at the rear end by a recessed groove.

[0029] The first grooves 110a, 110b, 210a, 210b and the second grooves 120a, 120b, 220a, 220b are grooves into which excess adhesive can escape. That is, when the first member 310 and the second member 320 are attached to the abutment surfaces 170, 271, 272 provided on the left side plate 303 and the side surfaces 303a, 381 of the vertical plate 380 and the right side plate 304 and the side surfaces 304a, 382 of the vertical plate 380 using an adhesive, excess adhesive flows into and is stored in the first grooves 110a, 110b, 210a, 210b and the second grooves 120a, 120b, 220a, 220b.

[0030] A side surface 381 on the left side L of the vertical plate 380 is provided with multiple recesses 130, each having a generally rectangular shape that is long in the front-to-rear direction FB of the key. The recesses 130 include a first recess 131 and a second recess 132 that are arranged vertically side by side on the front side F of the vertical plate 380, a third recess 133 that is arranged on the rear side B of the vertical plate 380, a fourth recess 134 that is arranged on the rear side B of the vertical plate 380, and a fifth recess 135 that is arranged on the rear side B of the vertical plate 380. The recesses 130 are formed as recesses in the key base member 300, which is manufactured by injection molding.

[0031] A side surface 382 on the right side R of the vertical plate 380 is provided with a plurality of recesses 230 each having a generally rectangular shape that is long in the front-to-rear direction FB. The recesses 230 include a first recess 231, a second recess 232, and a third recess 233 that are arranged vertically on the front side F of the abutment surface 272, a fourth recess 234 that is arranged on the rear side B, a fifth recess 235 that is arranged on the rear side B, and a sixth recess 236 that is arranged on the rear side B. The recesses 230 are formed as recesses in the key base member 300, which is manufactured by injection molding.

[0032] Furthermore, the third recess 133 of the recess 130 on the side surface 381 of the vertical plate 380 has the same position and size in the up-down direction UL and the front-to-back direction FB as the fourth recess 234 of the recess 230 on the side surface 382. Similarly, the fourth recess 134 has the same position and size in the up-down direction UL and the front-to-back direction FB as the fifth recess 235, and the fifth recess 135 has the same position and size in the up-down direction UL and the front-to-back direction FB as the sixth recess 236. In other words, the recess 130 and the recess 230 include recesses 130, 230 that are arranged opposite each other. The third recess 133 (fourth recess 234), the fourth recess 134 (fifth recess 235), and the fifth recess 135 (sixth recess 236) are provided intermittently on the same straight line in the front-to-back direction FB of the key. In addition, the third recess 133 (fourth recess 234), the fourth recess 134 (fifth recess 235), and the fifth recess 135 (sixth recess 236) each have different length dimensions in the front-to-back direction FB of the key, but the same height dimensions in the up-down direction UL.

[0033] The contact surfaces 170, 272 between the recesses 130, 230 and the second grooves 120b, 220b are continuous, linear surfaces that are aligned in the front-to-rear direction FB of the key. Therefore, adhesive for attaching the first member 310 and the second member 320 (rear second member 322) to the side surfaces 381, 382 can be applied effectively to the continuous contact surfaces 170, 272.

[0034] As shown in Fig. 6, the vertical plate 380 is provided with a plate-shaped switch pressing portion 33 that protrudes toward the lower side Lo from the inner surface of a lower opening portion 383 (described later). In addition, a protruding plate 306 that protrudes toward the right side R is provided on the lower surface of the right side plate 304. Similarly, two protruding plates 307 that protrude in the key arrangement direction LR are provided on the lower surface of the rear side B of the vertical plate 380. The protruding plates 306, 307 can receive the first member 310 and the second member 320 even if the first member 310 or the second member 320 should fall.

[0035] A rotation hole 308 is provided at the rear end of the key base member 300 in the key arrangement direction LR. The rotation hole 308 rotatably engages with the support shaft 25a of the inner case 25 inside the case 20. The counterweight 100, as well as first and second ribs 91 and 92 for fixing the counterweight 100, are provided on the underside of the wide portion 301a of the top plate 301, at the front and rear of the counterweight 100.

[0036] 7 and 8, a vertical plate 380 serving as a top surface support portion supporting the upper surface 301p (top surface) of the top panel 301 includes a lower opening portion 383 that opens in a bifurcated shape at the bottom, and side surfaces 381 and 382. In the cross-sectional view (longitudinal cross-sectional view) of the vertical plate 380 in FIGS. 7 and 8, a region VL (contact region) from the lower edge of the first groove portions 110b and 210b to the bifurcated starting point of the lower opening portion 383 is formed as a thin portion 385 having a second thickness or a thick portion 386 having a first thickness. The thin portion 385 having a second thickness is thinner in the key arrangement direction LR than the thick portion 386 having the first thickness.

[0037] 7, in the vertical plate 380, in a vertical cross section at a location where the recesses 130, 230 (fourth recess 134, fifth recess 235) are provided, a region VL from the lower edges of the first groove portions 110b, 210b to the bifurcated starting points of the lower open portion 383 is a thin-walled portion 385. On the other hand, as shown in FIG. 8, in the vertical cross section at a location where the recesses 130, 230 are not provided, a region VL from the lower edges of the first groove portions 110, 210 to the bifurcated starting points of the lower open portion 383 is a thick-walled portion 386.

[0038] As described above, the recesses 130, 230 are intermittently provided on the side surfaces 381, 382 of the vertical plate 380 in the front-to-back direction FB of the key. Therefore, the vertical plate 380 includes an area in which thick-walled portions 386 and thin-walled portions 385 are alternately provided in the front-to-back direction FB of the key. Furthermore, the thick-walled portions 386 and thin-walled portions 385 are alternately provided on the same line in the front-to-back direction FB of the key (for example, on a straight line in the front-to-back direction FB of the key that passes through the center VC of the area VL of the vertical plate 380 as shown in FIGS. 7 and 8 ). In other words, the top support portion (vertical plate 380) includes thick-walled portions 386 with a first thickness in the key arrangement direction LR and thin-walled portions 385 with a second thickness thinner than the first thickness, at different positions in the longitudinal direction (front-to-back direction FB) of the key base member 300.

[0039] As shown in Figure 7, in a vertical cross-sectional view, the contact area VL1, which is the area where the side surfaces 381, 382 of the thin-walled portion 385 contact the first member 310 and the rear second member 322, is the area of ​​the area VL excluding the recesses 130, 230 (the fourth recess 134, the fifth recess 235) (area VL1 + area VL2 < area VL).

[0040] Similarly, as shown in FIG. 8, in a vertical cross section, the contact area where the side surfaces 381, 382 of the thick portion 386 contact the first member 310 and the rear second member 322 is the entire range of the area VL.

[0041] The contact area of ​​the thick portion 386 is larger than the contact area of ​​the thin portion 385. That is, the contact area of ​​the thin portion 385 in which the recesses 130, 230 are provided, which is the area in contact with the first member 310 and the rear second member 322, is reduced by the length of the recesses 130, 230 in the up-down direction UL.

[0042] If a long recess is provided in the front-to-rear direction of the side surfaces 381, 382 of the vertical plate 380 to reduce the thickness, a thin portion 385 will be provided in the front-to-rear direction FB of the key, and the contact area in the vertical cross section perpendicular to the side surfaces 381, 382 where the side surfaces 381, 382 contact the first member 310 and the rear second member 322 will become extremely small. As a result, the areas of the abutment surfaces 170, 272 of the side surfaces 381, 382 that contact the first member 310 and the rear second member 322 will be reduced, and the first member 310 and the rear second member 322 may not be properly attached to the side surfaces 381, 382 due to insufficient adhesive strength.

[0043] However, in this configuration, by providing recesses 130, 230 intermittently and alternately providing thick portions 386 and thin portions 385, the thick portions 386 increase the contact area in the longitudinal cross section perpendicular to the side surfaces 381, 382 where the side surfaces 381, 382 contact the first member 310 and the rear second member 322, and the area of ​​the abutment surfaces 170, 272 where the first member 310 and the rear second member 322 contact the side surfaces 381, 382, ​​i.e., the area (contact area) where the first member 310 and the rear second member 322 are adhered to the side surfaces 381, 382 with adhesive, can be sufficiently secured.

[0044] In the above embodiment, the key base member 300 for the C key has been described, but the present invention can also be applied to key base members for the other keys A to F.

[0045] As described above, in an embodiment of the present invention, the keyboard instrument 10 comprises a key base member 300 including a top surface, which is the upper surface 301p of the top board 301, a vertical plate 380 as a top support member suspended from the lower surface 301q (the lower surface 301q corresponding to the top surface) of the top surface, and mounting members (first member 310, second member 320) arranged on the side surfaces 381, 382 of the top support member (vertical plate 380). The top support member (vertical plate 380) includes, at different positions along the longitudinal direction of the key base member 300, a thick portion 386 having a first thickness in the key arrangement direction LR and a thin portion 385 having a second thickness thinner than the first thickness, and the contact area of ​​the thick portion 386 with the mounting member (the entire range of area VL) is larger than the contact area of ​​the thin portion 385 with the mounting member (area VL1+VL2).

[0046] As a result, the first member 310 and second member 320 (rear second member 322) serving as mounting members attached to the side faces 381, 382 with adhesive or the like are able to maintain a sufficient contact area with the side faces 381, 382 while being appropriately thinned by the thin-walled portion 385, thereby improving moldability during injection molding. This makes it possible to provide a keyboard instrument equipped with a high-quality key base member 300 to which the wooden first member 310 and second member 320 (rear second member 322) serving as mounting members can be attached. While the top plate 301 and vertical plate 380 are plate-shaped in this embodiment, they may also be block-shaped or have other shapes.

[0047] The vertical plate 380 serving as the top support includes a lower open section 383 that is open at the bottom. On the lower side Lo of the top plate 301 (i.e., the lower side Lo of the top surface) and the upper side Up of the lower open section 383, thick sections 386 and thin sections 385 are alternately provided on the same line in the front-to-back direction FB of the key. This allows the linearly long vertical plate 380 to be properly formed. Furthermore, the first member 310 and the second member 320 (the rear second member 322) can be properly attached, thereby improving the quality of the narrow section 301b of the key base member 300. In particular, the first member 310 is prone to warping because it is long in the front-to-back direction FB of the key. However, the intermittent appearance of large adhesive areas (thick sections 386) reduces the risk of the first member 310, which is made of wood, falling off due to warping.

[0048] Furthermore, the thin-walled portion 385 includes recessed portions that are recesses 130, 230 recessed from the side surfaces 381, 382. As a result, even if the vertical plate 380 is one into which a core block of a mold is difficult to insert from below, by providing a core block that forms the recesses 130, 230 in the mold from the side surfaces 381, 382, ​​a mold that can easily mold the thin-walled portion 385 can be configured.

[0049] Furthermore, the recesses 130, 230, which are recessed portions, are provided intermittently across the front and rear of the key. This makes it easy to configure a mold structure for alternately providing thick-walled portions 386 and thin-walled portions 385. In this embodiment, the recesses 130, 230, which are recessed portions, include those that do not have the same width (length) in the longitudinal direction of the key. However, the width (length) in the longitudinal direction of the key of the recesses 130, 230, which are recessed portions, may all be the same.

[0050] Additionally, the recesses 130, 230, which are recessed portions, are aligned on the same line in the front-to-rear direction of the key. This allows the contact areas where the side surfaces 381, 382 meet the first member 310 and the second member 320 (rear second member 322) to include continuous linear regions, making it easier to apply adhesive to the key base member 300. In this embodiment, the recesses 130, 230, which are recessed portions, have approximately the same vertical width (length). However, the vertical width (length) of the recesses 130, 230, which are recessed portions, do not necessarily have to be the same.

[0051] Additionally, multiple recesses 130, 230, which are recesses with different lengths in the front-to-back direction (FB) of the key, are provided. This allows for appropriate recesses to be provided in accordance with the cooling rate of the resin in the mold, resulting in a key base member 300 that is well-prevented from sinking.

[0052] Furthermore, first grooves 110b, 210b, which are recessed grooves, are provided on side surfaces 381, 382 of the vertical plate 380, which is the top surface support part, on the lower side Lo of the top plate 301 (in other words, the lower side Lo of the top surface) and on the upper side Up of the thick portion 386 or the thin portion 385. This allows for a configuration in which excess adhesive is stored while also allowing the adhesive to flow into the top plate 301.

[0053] The key base member 300 has a wide section 301a where the top panel 301 (in other words, the width of the top surface) is wide, and a narrow section 301b where the top panel 301 (in other words, the width of the top surface) is narrow, and the vertical plate 380 is provided to correspond to the narrow section 301b. This makes it possible to provide a keyboard instrument 10 that includes a key base member 300 with a well-attached first member 310 and second member 320 (rear second member 322) while still maintaining a good shape even though the narrow section 301b is long and thin and difficult to shape.

[0054] Although several embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be embodied in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their modifications are included within the scope and spirit of the invention, and are also included in the scope of the invention and its equivalents as defined in the claims.

[0055] The invention described in the first claim of the present application is as follows: [1] A key base member including a top surface and a top surface support portion that is provided hanging down from the underside of the top surface; an attachment member disposed on a side surface of the top surface support portion; and The top support portion includes a thick portion having a first thickness in a key arrangement direction and a thin portion having a second thickness thinner than the first thickness, at different positions in a longitudinal direction of the key base member, a contact area of ​​the thick portion with the mounting member is larger than a contact area of ​​the thin portion with the mounting member; A keyboard instrument with keys. [2] The top surface support portion includes a lower opening portion that is open at the bottom, The keyboard instrument described in [1] above, wherein the thick portions and the thin portions are alternately provided on the same line in the front-to-back direction of the key below the top surface and above the lower open portion. [3] The keyboard instrument described in [1], wherein the thin-walled portion includes a recessed portion formed in a concave shape on the side surface. [4] The keyboard instrument according to [3], wherein the recessed portions are provided intermittently across the front and rear direction of the key. [5] The keyboard instrument according to [4], wherein the recessed portion is provided on the same line in the front-to-back direction of the key. [6] A keyboard instrument as described in [5], wherein a plurality of recessed portions having different lengths in the front-to-rear direction of the key are provided. [7] A keyboard instrument as described in [6], wherein a groove portion is provided on the side surface below the top surface of the top surface support portion and above the thick portion or the thin portion, extending in the front-to-back direction of the key. [8] The key base member has a wide portion where the top surface is wide and a narrow portion where the top surface is narrow, The keyboard instrument according to any one of [1] to [7], wherein the top surface support portion is provided in correspondence with the narrow portion. [Explanation of symbols]

[0056] 10 Keyboard instrument 11 Operation section 12 Earphone jack 20 Case 21 Upper case 21a Top surface 21b Top surface 21c Top surface 22 Lower case 23 Lower boss 24 Upper boss 25 Inner case 25a Support shaft 25b Support shaft 26 Upper cushion 27 Lower cushion 28 Upper cushion 29 Lower cushion 30 White key 31 Hammer pressure area 31a Hole 32 Regulating protrusion 32a Left restricting protrusion 32b Right restricting protrusion 33 Switch pressing part 40 Black key 50 Keyboard 60 Circuit board 61 Switch 70 Hammer component 71 Weight part 72 Arm part 73 Hammer cap 91 First rib 92 Second rib 100 Counterweight 110a First groove 110b First groove 120a Second groove portion 120b Second groove portion 130 recess 131 first recess 132 Second recess 133 Third recess 134 4th recess 135 5th recess 170 Contact surface 210 First groove 210a First groove 210b First groove 220a Second groove portion 220b Second groove portion 230 recess 231 first recess 232 Second recess 233 Third recess 234 4th recess 235 5th recess 236 6th recess 271 abutment surface 272 abutment surface 300 key base member 301 Top plate 301a Wide part 301b Narrow part 301c1 Side edge 301c2 side edge 301c3 side edge 301p top 301q bottom 302 Front plate 302c Rear side 303 Left side plate 303a Side 304 Right side plate 304a Side 305 Stepped portion 305a Connecting plate 306 Projection plate 307 Projection plate 308 Rotation hole portion 310 First member 310a Top 310b Bottom 310c front 310d rear 310e side 310f side 311 Front part 312 Rear part 320 second member 321 front second member 321a above 321c in front 321d rear 321e side 321f side 322 rear second part 322a above 322c in front 322d rear 322e side 322f side 380 degree angle plate 380a rear panel 381 side 382 side 383 lower side opening 385 Thin meat part 386 Thick meat part

Claims

1. A key base member including a top surface and a top surface support portion provided below the top surface; an attachment member disposed on a side surface of the top surface support portion; and The top surface support portion is a first groove portion provided on a lower side of the top surface; a lower opening portion provided below the first groove portion and opening at the bottom in a bifurcated shape; Including, a thick portion having a first thickness or a thin portion having a second thickness that is thinner than the first thickness in the key arrangement direction, provided between the lower edge of the first groove portion and the starting point of the fork of the lower opening portion; A keyboard instrument with keys.

2. the top surface includes a wide portion and a narrow portion that is narrower in width than the wide portion in the key arrangement direction, The thin portion and the lower opening portion are provided in the narrow portion.

2. The keyboard instrument according to claim 1.

3. A counterweight is provided below the wide portion.

3. The keyboard instrument according to claim 2.

4. The top surface support portion includes a thick portion having a first thickness in the key arrangement direction and a thin portion thinner than the first thickness, the thick portion being located at different positions in the longitudinal direction of the key base member but at the same position in the hanging direction from the top surface.

4. A keyboard instrument according to claim 1.

5. 5. The keyboard instrument according to claim 4, wherein the thick portions and the thin portions are provided intermittently across the front and rear direction of the key.

6. 5. The keyboard instrument according to claim 4, wherein the thick portion and the thin portion are provided on the same line in the front-to-rear direction of the key.

7. 5. The keyboard instrument according to claim 4, wherein the thin-walled portion includes a plurality of recessed portions recessed from the side surface, the recessed portions having different lengths in the front-rear direction of the key.

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