阅读说明：本技术 乐器 (Musical instrument ) 是由 川田辽平 井上馨 中岛裕树 小寺雅也 于 2019-11-15 设计创作，主要内容包括：一种乐器,其特征在于,具备：乐器壳体；以及安装构件,其包括固定于所述乐器壳体的固定部、用于安装乐谱架构件的安装部、以及作用点部,所述作用点部对应于在所述乐谱架构件安装于所述安装部的状态下对所述乐谱架构件施加的朝向第一方向的力,产生朝向第二方向的力,在所述乐器壳体侧,与所述作用点部对应地设置有对抗在所述作用点部产生的朝向所述第2方向的力的对抗构件。(A musical instrument is provided with: a musical instrument case; and an installation member including a fixing portion fixed to the musical instrument case, an installation portion for installing a music rack member, and an action point portion corresponding to the music rack member installed in the state of the installation portion to the force applied by the music rack member toward the first direction, generating a force toward the second direction the musical instrument case side is correspondingly provided with a counter-force toward the action point portion toward the force of the 2 nd direction.)

1. A musical instrument is provided with:

a musical instrument case; and

a mounting member including a fixing portion fixed to the musical instrument case, a mounting portion for mounting a music stand member, and an action point portion generating a force toward a second direction corresponding to a force toward the first direction applied to the music stand member in a state where the music stand member is mounted to the mounting portion,

on the side of the instrument case, a resisting member that resists a force generated at the action point portion in the 2 nd direction is provided corresponding to the action point portion.

2. The musical instrument according to claim 1,

the action point portion is not fixed within the instrument case, whereby the action point portion is displaced in the second direction when a force is applied to the score frame member in the first direction.

3. The musical instrument according to claim 2,

the fixing portion and the mounting portion are provided to the first member,

the point of action portion is provided to the second member.

4. The musical instrument according to claim 3,

the first member is formed of a resin material,

the second member is formed of a metal material.

5. The musical instrument according to claim 4,

the second member fixes the first member at least on the fixing portion side of the mounting member so as to oppose a force directed in the second direction.

6. The musical instrument according to claim 5,

the confronting member includes a protruding portion that protrudes in order to confront the force toward the second direction,

the point of action portion abuts against the protruding portion when a force is applied to the music stand member in the first direction.

7. Musical instrument according to any one of claims 1 to 6,

the fixing portion is fixed to an upper side of the instrument case,

the action point portion and the countermeasure member are provided on the lower side of the musical instrument case.

8. The musical instrument according to claim 7,

a keyboard is arranged in the musical instrument shell,

the mounting member and the countermeasure member are provided on the rear side of the keyboard.

Technical Field

The present invention relates to a musical instrument equipped with a music stand such as an electronic keyboard and an electronic piano.

Background

Conventionally, an electronic musical instrument such as an electronic keyboard or an electronic piano is provided with a music stand on which a music score is placed during playing. For example, in japanese patent laid-open No. 2005-284146, a musical score table insertion slot for inserting a musical score table into a top plate of a main body casing of an electronic keyboard instrument is provided so as to extend in a left-right direction (longitudinal direction) of the main body casing.

Disclosure of Invention

In the electronic keyboard instrument described in the above patent document and the like, when an unexpected load exceeding the weight of the musical score is applied to the musical score stand, there is a problem that the main body case around the musical score stand insertion groove is deformed or broken. Further, if a reinforcing member is provided around the music stand insertion groove in order to increase the strength of the main body case, there is a problem that the design of the electronic keyboard instrument is impaired.

Accordingly, an object of the present invention is to provide a musical instrument having a frame structure capable of preventing deformation or breakage of a main body casing even when an excessive load is applied to a musical score stand.

A musical instrument according to an aspect of the present invention includes: a musical instrument case; and an installation member including a fixing portion fixed to the musical instrument case, an installation portion for installing a music rack member, and an action point portion corresponding to the music rack member installed in the state of the installation portion to the force applied by the music rack member toward the first direction, generating a force toward the second direction the musical instrument case side is correspondingly provided with a counter-force toward the action point portion toward the force of the 2 nd direction.

According to the present invention, even when a load is applied to the music stand, the main body case can be prevented from being deformed or broken.

Drawings

Fig. 1A and 1B are overall external views showing an embodiment of a keyboard musical instrument of the present invention.

Fig. 2 is a schematic assembly view showing a structural example of a musical instrument main body of a keyboard musical instrument according to an embodiment.

Fig. 3 is a schematic sectional view showing an instrument main body of a keyboard instrument according to an embodiment.

Fig. 4 is a perspective sectional view showing a main part of an instrument main body of a keyboard instrument according to an embodiment.

Fig. 5 is a schematic diagram showing an example of a music rack applied to a keyboard musical instrument according to an embodiment.

Fig. 6A and 6B are schematic perspective views showing an example of a music rack mounting member applied to a keyboard musical instrument according to an embodiment.

Fig. 7A and 7B are three views showing an example of a music rack mounting member applied to an embodiment.

Fig. 8A and 8B are schematic perspective views showing an assembly structure of a music rack mounting member applied to an embodiment.

Fig. 9 is a perspective sectional view showing a main part of a lower case applied to a keyboard musical instrument of an embodiment.

Fig. 10 is a main part sectional view showing a relationship between the lower case and the music stand mounting member applied to an embodiment.

Fig. 11 is a schematic sectional view for explaining a moment generated in the keyboard musical instrument of the embodiment.

Fig. 12 is a main part sectional view for explaining the operation and effect of the embodiment.

Detailed Description

Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the drawings.

(keyboard musical instrument)

Fig. 1A and 1B are overall external views showing an embodiment of a keyboard musical instrument applied to the musical instrument of the present invention. Fig. 1A is a perspective view seen from a user side (front side) of the keyboard instrument, and fig. 1B is a perspective view seen from a back side (rear side) of the keyboard instrument. Fig. 2 is a schematic assembly diagram showing a structural example of a musical instrument main body of a keyboard musical instrument according to the present embodiment, fig. 3 is a schematic sectional view showing the musical instrument main body of the keyboard musical instrument according to the present embodiment, and fig. 4 is a perspective sectional view showing a main part of the musical instrument main body of the keyboard musical instrument according to the present embodiment. Fig. 5 is a schematic diagram showing an example of a music rack applied to the keyboard musical instrument of the present embodiment. In the present embodiment, an electronic keyboard musical instrument is described as an example of the musical instrument of the present invention, but other musical instruments may be used as long as they have a case structure to which a music rack can be attached.

As shown in fig. 1A and 1B, for example, a keyboard musical instrument 100 applied to the musical instrument of the present invention roughly has an instrument main body and a music stand (musical score stand member) 180. The musical instrument main body includes a main body case (musical instrument case) 120 extending in the left-right direction of the drawing, and a keyboard unit 160 assembled to the front side (near side in fig. 1A) of the main body case on the user side with the keyboard exposed, and a music rack 180 is attached to the back side of the rear side (far side in fig. 1A) of the main body case 120.

As shown in fig. 2 and 3, for example, the main body case 120 has an upper case 122 and a lower case 124, and a keyboard unit 160 is assembled between these cases 122 and 124. The upper case 122 has a housing provided with an opening 142 on the front side (near the front side in the drawing) for exposing each key of the keyboard unit 160, and an operation panel 144 provided with switches for performing operations such as volume adjustment and tone selection, a display panel for displaying information related to music being played, various setting information, and the like is disposed on the upper surface (top surface) 140 on the rear side (far side in the drawing) of the opening 142. Here, the operation panel 144 may have physical switches such as buttons, sliders, dial switches, and the like, or may have various touch panel switches incorporated inside the transparent or translucent upper case 122. Further, a sound source circuit board 146 for generating a musical sound corresponding to a tone pitch designated by a key operation performed by the user, a speaker 148 for emitting the generated musical sound, and the like are incorporated in the upper case 122. As shown in fig. 1B and 4, a mounting hole (mounting portion) 232 is provided in the rear surface of the upper case 122 so that the music rack 180 can be attached and detached.

The keyboard unit 160 has a plurality of keys as performance operators, and specifies a pitch by a user's key operation. As shown in fig. 1A and 2, the keyboard unit 160 has a plurality of white keys 162 and black keys 164 regularly arranged in a predetermined order in the longitudinal direction (the left-right direction in the drawing) of the keyboard instrument 100. Here, the keyboard unit 160 is arranged with 88 white keys 162 and black keys 164 in total.

The keyboard unit 160 and the upper case 122 are assembled to the inner surface side (the upper surface side in fig. 2 and 3) of the lower case 124. Accordingly, the front (front side in fig. 2) keyboard portion of the keyboard unit 160 exposed from the opening 142 of the upper case 122 becomes an area where the user performs a key operation, and the rear (back side in the drawing) side is housed inside the upper case 122.

The music rack 180 mounts a music score and a music album of a desired music piece, a tablet computer displaying the music score on a display panel, and the like. The music rack 180 has a bar-like mounting protrusion 184 protruding from the music rack main body 182, as shown in fig. 5, for example, and is detachably mounted to the instrument main body by inserting the mounting protrusion 184 into a mounting hole 232 provided on the back surface of the main body case 120 (upper case 122) shown in fig. 4.

As shown in fig. 1A and 1B (or fig. 11 described later), the music stand 180 is attached to the main body case 120 such that a music score (not shown) placed on the music stand 180 is inclined toward the rear of the main body case 120 when viewed from the front of the main body case 120, which is the user side. That is, the music rack 180 is designed such that the front end side (the back side in fig. 1A, the right end portion in fig. 11 described later) is positioned upward, and the music rack main body 182 is inclined at a predetermined angle (for example, 45 ° or 60 °) with respect to the plane on which the instrument main body is placed. In addition, as shown in the sectional structure of the instrument main body in fig. 3 and 4, 166 is a hammer member which is connected to the white key 162 and the black key 164 individually, and gives an operation load in accordance with a key operation, and 168 is a switch unit which is turned on in accordance with the key operation of the white key 162 and the black key 164 to generate music information.

(music stand mounting member)

Fig. 6A and 6B are schematic perspective views showing an example of a music rack mounting member applied to the keyboard musical instrument of the present embodiment, and fig. 7A and 7B are three views showing an example of a music rack mounting member applied to the present embodiment. Here, fig. 7A is a three-view showing an appearance of the music rack mounting member, and fig. 7B is a main portion sectional view of the music rack mounting member. Fig. 8A and 8B are schematic perspective views showing an assembly structure of a music rack mounting member applied to the present embodiment. Here, fig. 8A is a view seen from the mounting hole side of the upper member, and fig. 8B is a view seen from the lower member side.

In the present embodiment, as shown in fig. 3 and 4, a music stand mounting member 200 is provided on the rear side (the right side in the drawing) of the keyboard unit 160 inside the main body casing 120. The music rack 180 is attached by inserting the attachment protrusion 184 into the attachment hole 232 of the music rack attachment member 200 exposed on the rear surface of the main body case 120 (upper case 122).

Specifically, for example, as shown in fig. 6A and 6B, fig. 7A, fig. 8A, and fig. 8B, the music stand mounting member 200 has an upper member (1 st member) 220 as a base portion and a lower member (2 nd member) 240 as an extended portion for extending the base portion in a specific direction (downward direction in the drawing), and these members 220, 240 are integrally assembled.

The upper member 220 of the music stand mounting member 200 has a body fixing portion 222 and a mounting hole 232, the body fixing portion 222 is mounted and fixed from the inside to the upper surface (top surface) 140 side of the upper case 122 of the body case 120 on the upper end side (upper side in fig. 6A and 6B), and the mounting hole 232 is provided to the back surface side (right side surface in fig. 4) of the upper case 122 to mount the music stand 180.

For example, as shown in fig. 6A and 6B, and fig. 7A and 7B, the body fixing portion 222 includes a mounting plate 224 provided with a mounting hole 226, and the mounting hole 226 is provided for the inner housing (see fig. 3 and 4)126 disposed directly on the upper housing 122 or inside the upper surface (top surface) 140 of the upper housing 122. As shown in fig. 3 and 4, the body fixing portion 222 is fixed to the upper case 122 by fastening (screw fastening) with screws 230 from the inside of the body case 120 through mounting holes 226 of the mounting plate 224 at 1 to a plurality of locations. Here, the mounting plate 224 may be fixed in close contact with the entire area of the upper casing 122 or the inner casing 126, may be fixed in close contact with the upper casing 122 or the inner casing 126 only in the area around the mounting hole 226, or may be supported and fixed at a plurality of points by the support protrusions 228 disposed at predetermined positions in close contact with the upper casing 122 or the inner casing 126 except for the area around the mounting hole 226, as shown in fig. 6A and 6B, and fig. 7A and 7B. In addition, when the inner case 126 disposed inside the upper case 122 is a touch panel type switch applied to the operation panel 144 disposed on the upper surface (top surface) 140 of the upper case 122, for example, a support member on which a display device, a touch sensor, a control circuit, and the like for displaying the switches are mounted can be applied.

For example, as shown in fig. 4, the mounting hole 232 is provided so as to be exposed from the case hole 128 provided on the back surface of the main body case 120 (upper case 122) in a state where the main body fixing portion 222 is mounted on the upper surface 140 side of the upper case 122 from the inside. As shown in fig. 7B, the mounting hole 232 has a concave portion of a substantially truncated cone shape whose inner diameter gradually decreases from the back surface side (right side in the drawing) of the main body case 120 toward the inside direction (left lower direction in the drawing) of the instrument main body. Accordingly, when the music rack 180 is mounted, the inner diameter is formed to be large near the entrance of the mounting hole 232 exposed on the back surface of the main body case 120, so that the mounting protrusion 184 of the music rack 180 is easily inserted, and the inner diameter is formed to be smaller toward the back side (inner direction of the instrument main body) of the mounting hole 232, so that the mounting protrusion 184 comes into close contact with the inner wall of the mounting hole 232 by the self weight of the music rack 180 as shown in fig. 11 described later, thereby stably mounting and fixing the music rack 180.

Further, the lower member 240 of the music stand mounting member 200 has a body abutment portion (action point portion) 242 that abuts against the lower case 124 side of the body case 120 on the lower end side (lower side in fig. 6A and 6B). As shown in fig. 3 (or fig. 10 and 11 described later), for example, the body contact portion 242 is separated from or slightly contacts the rotation suppressing portion (opposing member) 154 provided on the inner surface side of the lower case 124 with a slight gap in a state where the body fixing portion 222 of the upper member 220 is attached to the upper surface (top surface) 140 side of the upper case 122 from inside. That is, the lower end side of the music stand mounting member 200 provided with the main body abutting portion 242 is in a state of being not fixed to a free end at any position within the main body case 120. As described later, for example, when a force is applied in a direction (first direction) in which the music stand 180 is pressed downward by applying an excessive load exceeding a predetermined value to the music stand 180 attached to the main body case 120, the main body contact portion 242 is displaced in a rotational direction (left direction in the drawing; second direction) of the music stand attachment member 200 by a moment, and is pressed and brought into contact with the rotation suppressing portion 154 on the lower case 124 side by a force corresponding to the moment in the rotational direction.

In the present embodiment, the upper member 220 and the lower member 240 of the music stand mounting member 200 are integrally assembled in such a manner as to be fastened by screws 244, 246 at 1 to a plurality of places, as shown in fig. 7B, 8A, and 8B, for example. In the present embodiment, as shown in fig. 7B, for example, screw fastening positions are set at two positions in the vicinity of the attachment plate 224 on the upper end side of the upper member 220 (left side surface in the drawing) and on the lower end side (lower surface in the drawing) facing the attachment plate 224, and the upper member 220 and the lower member 240 are integrally assembled so as to be fastened by screws 244 and 246 in the inner direction of the upper member 220.

The number, position (arrangement), and fastening direction of the screws for assembling the upper member 220 and the lower member 240 are set so that the assembled state of the upper member 220 and the lower member 240 can be maintained well against the pressing force even when the above-described rotational moment is generated in the music stand mounting member 200 and the rotation suppressing portion 154 on the lower member 240 side is pressed in the rotational direction by the main body contact portion 242 of the lower member 240. Specifically, in the case where a load is applied to the music stand 180 attached to the music stand attachment member 200, the screw fastening is preferably arranged in a plane (a plane along the paper surface of fig. 3 or 7B) including the direction of the rotational moment generated in the music stand attachment member 200 and set in a direction toward the fulcrum of the rotational moment. In the present embodiment, as shown in fig. 7B, 8A, and 8B, the screw fastening at the position near the attachment plate 224 on the upper end side of the upper side member 220 is set in the short side direction (right direction in fig. 7B) D1 of the music stand attachment member 200, and the screw fastening at the position on the lower end side of the upper side member 220 is set in the long side direction (upper direction in fig. 7B) D2 of the music stand attachment member 200.

Here, if the screw fastening of the upper member 220 and the lower member 240 is set at a position or fastening direction other than the position or fastening direction within the plane including the direction of the above-described rotational moment, the self weight or excessive load of the music rack 180 is applied, and the close contact between the upper member 220 and the lower member 240 after the screw fastening is reduced, and the rattling or misalignment is likely to occur. In contrast, in the present embodiment, since the screw fastening position is set in the plane including the direction of the rotational moment generated in the music stand mounting member 200 and the fastening direction is set in the direction of the approximate fulcrum of the rotational moment, the problem of the deterioration of the close contact property can be solved well and the rotational moment generated in the music stand mounting member 200 can be cancelled well. Further, according to the present embodiment, as described later, when a resin molding member is applied as the upper member 220, since the position of the screw hole and the fastening direction can be set in accordance with the mold release direction (the mold separation direction) in the resin molding step, the upper member 220 can be manufactured satisfactorily and easily.

As shown in fig. 6B, 7B, and 8B, the upper member 220 and the lower member 240 of the music rack attachment member 200 are provided with assembly guide portions 236 and 248 for supporting the assembly work, respectively. Specifically, as shown in fig. 7B and 8B, for example, an assembly guide 236 having a protrusion is provided near a fastening position (threaded hole) of the screw 244 of the upper member 220, and an assembly guide 248 having a through hole is provided near a through hole of the screw 244 of the lower member 240. In the assembly work of the upper member 220 and the lower member 240, the projection of the assembly guide 236 is fitted into the through hole of the assembly guide 248, whereby the assembly position of the upper member 220 and the lower member 240 can be determined, and the both positions can be temporarily fixed without being displaced, so that the assembly work can be efficiently performed.

In the present embodiment, the upper member 220 of the music stand mounting member 200 is formed of a resin material (resin molded member) in order to improve the shape of the mounting plate 224 to be mounted and fixed to the upper case 122 side, the shape of the mounting hole 232 exposed from the case hole 128 provided on the rear surface of the upper case 122 and the periphery thereof, the degree of freedom of design, and the workability. On the other hand, the lower member 240 is formed of a metal material (sheet metal press-formed member) in order to achieve a member strength that can withstand the force of pressing the rotation suppressing portion 154 on the lower case 124 side by the rotational moment generated in the music stand mounting member 200 due to the mounting of the music stand 180 in the mounting hole 232 of the upper member 220 (i.e., the force applied to the body abutting portion 242 when suppressing the rotation of the music stand mounting member 200). As described above, by applying the structure in which the upper member 220 as the base portion and the lower member 240 as the extension portion are assembled by screw fastening as the music stand mounting member 200, it is possible to use the music stand mounting member in which the lower members 240 having the lengths corresponding to the respective height dimensions are assembled to the common upper member 220 having a single size for the keyboard musical instruments 100 having the different height dimensions of the main body casing 120, and it is possible to suppress an increase in the number and the kind of members.

(lower case)

Fig. 9 is a perspective sectional view showing a main part of a lower case applied to a keyboard musical instrument of the present embodiment, and fig. 10 is a main part sectional view showing a relationship between the lower case applied to the present embodiment and a music stand mounting member.

In the present embodiment, as shown in fig. 3 and 9, a rotation suppressing portion 154 that abuts against a main body abutting portion 242 on the lower end side of the music stand mounting member 200 is provided on the rear side (the right side in the drawing) of the keyboard unit 160 in the main body case 120. When the music stand 180 is attached to the main body case 120, a music score is placed on the music stand 180, or an excessive load exceeding a desired load is applied to the music stand 180, the rotation suppressing portion 154 is provided at a position abutting against the main body abutting portion 242 of the music stand attachment member 200, and suppresses the rotation against a force in the rotational direction in the main body abutting portion 242, thereby canceling out a rotational moment generated with the main body fixing portion 222 of the music stand attachment member 200 as a fulcrum.

Specifically, for example, as shown in fig. 3 and 9, the rotation suppressing portion 154 has a plate-like rib that protrudes toward the inner surface side of the lower case 124 of the main body case 120 and extends in the rotation direction of the lower end side of the music stand mounting member 200 (the short side direction (the left-right direction in the drawing) of the lower case 124) based on the above-described rotation moment. In a state where the music rack 180 is not mounted on the music rack mounting member 200 mounted on the upper surface (top surface) 140 side of the upper case 122 of the main body case 120 from the inside or in a state where an excessive load is not applied to the mounted music rack 180, the rotation suppressing portion 154 is arranged such that one end side (rightward in the drawing) of the rib of the rotation suppressing portion 154 is separated from the main body abutting portion 242 of the music rack mounting member 200 with a slight gap GP or is lightly in contact with each other to such an extent that no stress is generated, as shown in fig. 10. Here, the ribs of the rotation suppressing portion 154 may be provided so as to protrude solely toward the inner surface side of the lower case 124, or may be provided so that another member provided on the inner surface side of the lower case 124 (for example, as shown in fig. 9 and 10, a reinforcing member 152 provided extending in the longitudinal direction of the lower case 124, or the like) is coupled to the other end side (the left side in the drawing) of the ribs.

The keyboard musical instrument of the present embodiment is advantageous in that the instrument main body is more miniaturized than the existing models. However, even when the keyboard instrument is miniaturized, the instrument body has a horizontally long shape in a structure including the keyboard, and the length of the keys in the arrangement direction (longitudinal direction) is longer than the length of the keys in the front-back direction (short-side direction) and the length of the keys in the up-down direction. Further, since the keyboard musical instrument of the present embodiment includes a plurality of hammer members 166 for applying an operation load to each of a plurality of keys, the mass of the instrument main body is several kilograms or more in some cases. The keyboard musical instrument of the present embodiment is also provided with some techniques for securing the strength of the casing of the musical instrument main body, one of which is a reinforcing member 152 extending in the longitudinal direction of the lower case 124. The reinforcing member 152 is excellent in durability against deflection in the center lower than both ends of the instrument body due to the laterally long shape of the instrument body, and torsion generated by applying forces in different directions to both ends of the instrument body. However, since the reinforcing member 152 extends in the longitudinal direction of the lower case 124, the durability against the force applied from the front-rear direction of the key is lower than the durability against the deflection and the torsion. However, by applying a force from the music stand 180 side to the instrument main body side, the main body abutting portion 242 disposed at one end of the music stand mounting member 200 is applied with a force moving in the front-rear direction of the key (the 2 nd direction shown in the direction of the arrow a in fig. 11). To enhance the durability against the force of this movement, the rotation suppressing portion 154 is provided. In the keyboard musical instrument of the present embodiment, since the body contact portion 242 does not directly contact the reinforcement member 152 and the body contact portion 242 contacts the rotation suppressing portion 154, there is an advantage that deformation of the reinforcement member 152 can be suppressed as compared with directly contacting the body contact portion 242 with the reinforcement member 152.

In the keyboard musical instrument according to the present embodiment, the reinforcing member 152 and the rotation suppressing portion 154 may be used as a rotation suppressing member for suppressing the rotation of the main body contact portion 242. Further, the reinforcing member 152 is provided to extend in the longitudinal direction of the lower case 124, but in this case, the thickness of the portion of the reinforcing member 152 in contact with the body contact portion 242 is larger than the thickness of the portion of the reinforcing member 152 in contact with the body contact portion 242. This is because the rotation suppressing portion 154 is provided at the portion where the main body abutting portion 242 abuts.

(Effect)

Next, the operation and effects of the keyboard instrument 100 of the present embodiment will be described.

Fig. 11 is a schematic sectional view for explaining the moment generated in the keyboard musical instrument of the present embodiment, and fig. 12 is a main part sectional view for explaining the operation and effect of the present embodiment.

In the keyboard instrument 100 in which the music stand mounting member 200 is provided inside the instrument main body as described above, as shown in fig. 11, when the music stand 180 is mounted on the mounting hole 232 of the music stand mounting member 200, a music score is placed on the mounted music stand 180, or an excessive load exceeding a supposed load is applied to the music stand 180 and a force is applied in a direction (arrow P; first direction in the drawing) in which the front end side of the music stand 180 is pressed, a moment as shown in fig. 12 is generated. That is, a rotational moment is generated with the music stand 180 as a force point portion and the body fixing portion 222 of the mounting plate 224 including the upper end portion of the music stand mounting member 200 as a fulcrum portion, and a force rotating in the left direction of the drawing (arrow a; second direction) is exerted with the body abutting portion on the lower end side of the music stand mounting member 200 not fixed anywhere inside the body case 120 as a point portion. Here, since the music rack 180 mounts a music score, a music album, a writing board, and the like, it is required to have a certain height dimension, and is attached to the main body case 120 so that the front end side (right end portion in fig. 11) thereof protrudes upward. Therefore, when a force is applied to the front end side of the music rack 180, a large moment is generated, and the music rack is easily rotated.

As described above, when the entire area of the attachment plate 224 is fixed in close contact with the upper case 122 side, the entire area of the attachment plate 224 serves as a fulcrum of the rotational moment, and when the attachment plate is fixed to the boss extending from the upper case 122 side by screw fastening, the area (FA in the drawing) around the attachment hole 226 of the attachment plate 224 and the area closest to the attachment hole 232 of the body fixing portion 222 in close contact with the boss serve as the fulcrum, and the area including the portion (FB in the drawing) in contact with the upper case 122. When the body fixing portion 222 is fixed to the boss on the upper case 122 side by screw fastening and the support projection 228 is in close contact with the upper case 122 side, a region (FA in the drawing) around the attachment hole 226, a portion (FB in the drawing) of the body fixing portion 222 closest to the attachment hole 232 and in contact with the upper case 122, and a region (FC in the drawing) where the support projection 228 is in close contact with the upper case 122 serve as fulcrum portions.

In the present embodiment, as described above, the rotation suppressing portions 154 are provided on the inner surface side of the lower case 124 in a protruding manner, and the rotation suppressing portions 154 are arranged so as to be separated or lightly contacted with the body abutting portion 242 on the lower end side of the music rack mounting member 200 with a slight gap GP, as shown in fig. 10, in a state where the music rack 180 is not mounted on the main body case 120 or in a state where an excessive load is not applied to the mounted music rack 180. Further, the dimension in the longitudinal direction (the vertical direction in fig. 7A and 7B) of the lower member 240 is set long so as to balance against a large rotational moment generated when a force is applied to the front end side of the music rack 180, so that the distance from the body fixing portion 222 on the upper end side of the music rack attachment member 200 as the fulcrum portion to the body abutting portion 242 on the lower end side as the operating point portion is made long.

Therefore, when the above-described rotational moment is generated in the music stand mounting member 200, the main body abutting portion 242 on the lower end side of the music stand mounting member 200 immediately abuts against the rotation suppressing portion 154 of the lower case 124, as shown in fig. 12. At this time, the rotation suppressing portion 154 suppresses the rotation (the displacement in the left direction of the drawing indicated by the arrow a) of the lower end side of the music stand mounting member 200 against the force received from the main body abutting portion 242 of the music stand mounting member 200 by the above-described rotational moment.

Accordingly, even when an excessive load is applied to the music stand 180, the music stand mounting member 200 provided inside the main body case 120 cancels the rotational moment, and the load can be suppressed from concentrating on the music stand mounting portion and the periphery thereof, so that the main body case 120 can be prevented from being deformed or damaged without affecting the design of the keyboard instrument 100.

Here, in the present embodiment, a description has been given of a mode in which the upper end side of the music stand mounting member 200 is fixedly attached to the upper case 122 side of the main body case 120 and the lower end side is extended in the direction of the lower case 124 on the rear side of the keyboard unit 160 assembled to the main body case 120 so as to extend in the height direction of the main body case 120. In the keyboard musical instrument according to the embodiment of the present invention, in a structure including a keyboard mechanism for applying a load to keys, in order to secure a certain degree of size in the height direction and to miniaturize the product, a method of reducing the size in the short side direction of the main body case 120 that becomes the front-rear direction of the keyboard musical instrument is adopted. In the present embodiment, focusing on the height direction of the space on the rear side of the keyboard unit 160 of the main body casing 120 having a certain size even when the product is miniaturized as described above, the rotational moment generated when an excessive load is applied to the music stand 180 can be satisfactorily cancelled even in the miniaturized product by applying the configuration in which the music stand mounting member 200 is extended in the height direction. The present invention is not limited to this embodiment, and a method of extending the music stand mounting member 200 in the short side direction may be applied to a case where a sufficient size and space can be secured in the short side direction of the main body case 120.

In the present embodiment, at least when an excessive load is applied to the music rack 180 attached to the main body case 120, the main body abutment portion 242 of the music rack attachment member 200 abuts against the rotation suppressing portion 154 provided on the lower case 124, and the rotation of the lower end side of the music rack attachment member 200 can be reliably suppressed. Therefore, when the main body case 120 is manufactured by assembling the upper case 122 and the lower case 124, the main body abutment portion 242 of the music stand mounting member 200 only needs to be in a state of not contacting the rotation suppressing portion 154 of the lower case 124 or in a state of lightly contacting the same, so that high assembling accuracy is not required in manufacturing the main body case 120, and the assembling work can be efficiently performed.

In the above-described embodiment, the upper member 220 and the lower member 240 are formed of a resin material and a metal material as the music stand mounting member 200, and the two members are integrally assembled. The present invention is not limited to this, and for example, the music stand mounting member 200 may be realized by forming the mounting hole 232 and the peripheral portion thereof from a resin material by an insert molding method or the like, and by forming the music stand mounting member 200 from a single member integrated in advance, by forming substantially the entire music stand mounting member 200 except for the mounting hole 232 and the peripheral portion thereof from a metal material (sheet metal press-molded member). This can reduce the number of members constituting the music stand mounting member 200 and the number of assembling steps. Further, since substantially the entire music stand mounting member 200 except for the mounting hole 232 and the peripheral portion thereof is formed of a metal material, the strength of the body fixing portion 222 and the body abutting portion 242 can be set high, and since the mounting hole 232 and the peripheral portion thereof are formed of a resin material, the degree of freedom in shape and design of the mounting hole 232 can be satisfactorily secured.

The present invention is not limited to the form in which the music stand mounting member 200 is formed of a material different from the resin material and the metal material, and the entire music stand mounting member 200 may be formed of a single material (such as a resin material or a metal material) as long as the strength of the lower end side can be set high while the shape and the degree of freedom in design of the upper end side of the music stand mounting member 200 can be secured. Here, the music stand mounting member 200 may be formed by two-color molding or the like, for example, and may be made of a material corresponding to the characteristics of the upper end side and the lower end side. Thus, the music stand mounting member 200 can be realized by one member integrated in advance, the number of members constituting the music stand mounting member 200 can be reduced, and the number of assembling work steps can be reduced.

In the present embodiment, a feature has been described in which the lower end side of the music stand mounting member 200 is set to a free end state which is not fixed to any position of the lower case 124 in a state where an excessive load is not applied to the music stand 180 mounted to the main body case 120, and thus high accuracy is not required in assembling the main body case 120. The present invention is not limited to this, and when high assembly accuracy can be ensured at the time of manufacturing the main body case 120, a mode in which the lower end side of the music stand mounting member 200 is fixed to the main body case 120 (lower case 124) by screw fastening or the like in advance may be applied. Thus, the music stand mounting member 200 is firmly fixed to both the upper case 122 and the lower case 124 in the main body case 120, and therefore, the strength of the main body case 120 can be increased without imposing an excessive load on the music stand 180, and deformation and breakage can be prevented.

In the present embodiment, although the music rack 180 is attached to the back surface side of the main body case 120, the present invention is not limited to this, and a music rack attachment member having an attachment hole exposed to the upper surface (top surface) 140 of the main body case 120 may be provided inside and the music rack 180 may be attached to the upper surface side of the main body case 120.

Although the present invention has been described in connection with the above embodiments, the present invention is not limited to the above embodiments, and includes the claimed invention and its equivalent scope.