JP7384243B2 - keyboard instrument - Google Patents

Description

The present invention relates to a keyboard instrument including a keyboard device such as an electronic piano.

Conventionally, various reinforcing methods have been applied to electronic keyboard instruments such as electronic pianos in order to improve the casing strength of the instrument body. For example, Patent Document 1 discloses that a plurality of hanging parts have the function of holding a sound regulating body (sound absorbing body) for improving the acoustic characteristics of an electronic keyboard instrument and the function of reinforcing the housing. A casing structure is described in which the casing is arranged along the side wall surface of the casing, and each hanging portion is connected to the side wall surface of the casing via a connecting rib.

Japanese Patent Application Publication No. 2014-211618

Although the casing structure described in the first embodiment described above is effective for improving the strength around the side wall surface of the casing, it has the following problems. That is, since an electronic keyboard instrument has a keyboard unit in which a plurality of keys are arranged, it necessarily has a housing that is long in the direction in which the keys are arranged. In electronic keyboard instruments that have such a housing, if the thickness of the housing member is designed to be thin in order to achieve miniaturization and weight reduction, the longitudinal strength of the housing will decrease, causing deformation such as bending and twisting. This can easily cause damage to the instrument itself, and the operability and acoustic characteristics of the instrument may deteriorate. Therefore, there is a need for a housing structure that more effectively solves these problems.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a keyboard instrument that can be made smaller and lighter by effectively improving the strength of the housing.

A keyboard instrument according to the present invention includes a plurality of hammer members each having a housing, a weight portion that applies a load to a pressed key, and a fulcrum portion pivotally supported by a holding member, and two adjacent hammer members. A portion corresponding to the weight portion is provided in a gap between the two hammer members, and is configured to prevent the weight portion from abutting even when each hammer member swings in the direction in which the keys are arranged around the fulcrum portion. a reinforcing member whose height is lower than other parts, and the reinforcing member is integrally molded with the housing .

According to this invention, the strength of the casing of a keyboard instrument can be effectively improved and the keyboard instrument can be made smaller and lighter.

1 is an external view showing an embodiment of a keyboard instrument according to the present invention. FIG. 1 is a schematic assembly diagram showing a structural example of a keyboard instrument according to an embodiment. FIG. 2 is a schematic diagram showing a lower case applied to a keyboard instrument according to an embodiment. It is a principal part perspective view showing the 1st case reinforcement part applied to the keyboard musical instrument concerning one embodiment. FIG. 2 is a cross-sectional view of a main part of a musical instrument body to which a first case reinforcing section according to an embodiment is applied. FIG. 3 is a plan view of a main part showing a second housing reinforcement section applied to a keyboard instrument according to an embodiment. FIG. 2 is a cross-sectional view (part 1) of a main part showing a keyboard mechanism of a musical instrument main body to which a second case reinforcing portion according to an embodiment is applied. FIG. 2 is a cross-sectional view (Part 2) of a main part showing a keyboard mechanism of a musical instrument main body to which a second case reinforcing portion according to an embodiment is applied. It is a figure which shows an example of the interference state of the rib of the 2nd housing|casing reinforcement part and the hammer member applied to the keyboard instrument based on one embodiment. FIG. 7 is a plan view illustrating an example of an arrangement interval of ribs of a second housing reinforcement section applied to a keyboard instrument according to an embodiment. It is a schematic perspective view which shows the 3rd housing|casing reinforcement part applied to the keyboard instrument based on one embodiment. It is a schematic sectional view showing a musical instrument main body to which a third case reinforcement part concerning one embodiment is applied. It is a schematic perspective view which shows the 4th housing|casing reinforcement part applied to the keyboard instrument based on one embodiment. It is a schematic sectional view showing a musical instrument main body to which a fourth case reinforcement part concerning one embodiment is applied. It is a schematic diagram showing an example of cable arrangement inside a musical instrument body to which a fourth case reinforcement part concerning one embodiment is applied.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the drawings.
(keyboard instrument)
FIG. 1 is an external view showing an embodiment of a keyboard instrument according to the present invention. Moreover, FIG. 2 is a schematic assembly diagram showing a structural example of the keyboard instrument according to this embodiment. Here, an electronic piano will be explained as an example of a keyboard instrument, but it has a housing that extends in a specific direction as a longitudinal direction, and produces musical tones in response to key presses by the user (player). Other electronic musical instruments may be used, if any.

The keyboard instrument according to the present invention, as shown in FIGS. 1(a) and 1(b), includes an electronic piano instrument body 100 and a stand 200 on which the instrument body 100 is placed and fixed. . Here, in order to place the musical instrument main body 100 at a specific position on the upper surface of the stand 200, the instrument body 100 has a positioning recess that fits into a positioning projection 202 provided on the stand 200 side, as shown in FIG. 1(b), for example. (described in detail later) is provided on the lower surface side. The musical instrument main body 100 positioned on the top surface of the stand 200 is fastened and fixed to the top surface of the stand 200 using fastening parts (not shown) such as screws and bolts.

The musical instrument body 100 generally includes a keyboard unit 120, an upper case 140, and a lower case 160, as shown in FIGS. 1 and 2, for example. The keyboard unit 120 has a plurality of keys as performance operators on the front side (front side in the drawing) facing the user, and the pitch is specified by the user's key press operation.

The upper case 140 has a frame body with an opening 142 through which each key of the keyboard unit 120 is exposed, and on the upper surface behind the opening 142 (on the back side in the drawing), there are operations such as volume adjustment and tone selection. An operation panel 144 is arranged, which includes switches for performing operations, a display panel for displaying information regarding the music being played, various setting information, and the like. The upper case 140 also incorporates a sound source circuit board 146 that generates a musical tone according to a pitch specified by a key press operation by the user, a speaker 148 that emits the generated musical tone, and the like. The lower case 160 has the keyboard unit 120 and the upper case 140 assembled on its inner surface (top side in the drawing), and has positioning recesses and screw holes for mounting and fixing on the stand 200 on its outer surface (bottom side in the drawing). is provided.

As shown in FIGS. 1 and 2, the keyboard unit 120 has a plurality of white keys 122 and black keys 124 regularly arranged in a predetermined order in the longitudinal direction of the musical instrument body 100 (in the left-right direction in the drawing). Here, the keyboard unit 120 has a total of 88 white keys 122 and black keys 124 arranged. These white keys 122 and black keys 124 are attached to a common keyboard chassis 126 so as to be individually rotatable in the vertical direction. In the keyboard unit 120, the front side (front side in the drawing) exposed from the opening 142 of the upper case 140 is an area where the user performs key press operations, and the rear side (back side in the drawing) is the area inside the upper case 140. is stored in. Note that in this specification, when the term "key" is used, it refers to matters common to white keys and black keys unless otherwise specified.

FIG. 3 is a schematic diagram showing a lower case applied to the keyboard instrument according to this embodiment. FIG. 3(a) is a diagram showing the outer surface side of the lower case, and FIG. 3(b) is a diagram showing the inner surface side of the lower case. Here, the outer side of the lower case corresponds to the lower side of the instrument main body 100 shown in FIGS. 1 and 2, and the inner side of the lower case corresponds to the inner side of the instrument main body 100 or the lower It corresponds to the upper surface side of the case 160.

In this embodiment, in order to improve the casing strength of the keyboard instrument, as shown in FIG. 3, the lower case 160 is provided with a plurality of casing reinforcing parts 310 to 340 of different types. Each of the casing reinforcement parts 310 to 340 has a plurality of plate-like members arranged in the longitudinal direction of the musical instrument body 100 or the lower case 160, and in the lateral direction of the musical instrument body 100 or the lower case 160 perpendicular to the longitudinal direction. It has ribs. Here, the longitudinal direction of the musical instrument body 100 or the lower case 160 corresponds to the arrangement direction of the keys of the keyboard unit 120, as shown in FIGS. 2 and 3, and the lateral direction of the musical instrument body 100 or the lower case 160 corresponds to As shown in FIG. 2, it is orthogonal to the key arrangement direction and corresponds to the longitudinal direction of the keys in which the upper surfaces of the keys of the keyboard unit 120 extend.

Each of the casing reinforcing sections 310 to 340 will be specifically explained below.
(1) First housing reinforcement section 310
FIG. 4 is a perspective view of a main part showing the first case reinforcement part applied to the keyboard instrument according to the present embodiment, and FIG. 5 is a main part perspective view showing the first case reinforcement part applied to the keyboard instrument according to the present embodiment. FIG. 2 is a cross-sectional view of the main parts of the musical instrument body. In addition, in FIG. 5, a cross section is shown with the upper case omitted for convenience of illustration.

Specifically, as shown in FIG. 3A, the first case reinforcing portion 310 is provided in a region (first region) extending in the longitudinal direction of the lower case 160 on the outer surface side of the lower case 160. , a continuous groove portion 312 is provided. As shown in FIG. 4 and FIG. A rib 314 having a plurality of plate-like members extending in the longitudinal direction of the case 160, and a rib 316 having a plurality of plate-like members extending in the transverse direction of the lower case 160 orthogonal to the longitudinal direction. They are arranged in a grid pattern. Here, as shown in FIGS. 4 and 5, the ribs 314 and 316 are integrally provided within the groove 312 with a height substantially equal to the depth of the groove 312.

In this way, by providing the groove portion 312 continuous in the longitudinal direction of the lower case 160 and the ribs 314 and 316 arranged in a grid pattern inside the groove portion 312, the thickness of each member is reduced in order to reduce the size and weight of the instrument body 100. Even when the thickness is designed to be thin, deformation (bending) that occurs in a direction perpendicular to the longitudinal direction of the lower case 160 and the instrument body 100 including the lower case 160 can be suppressed, and the strength of the housing is improved. can be done. In addition, by widening the width of the groove 312 in the lateral direction of the lower case 160 and making the rib 316 longer in accordance with the width, the rotational direction of the lower case 160 and the musical instrument body 100 can be rotated about the longitudinal direction of the instrument body 100. Deformation (twisting) can also be suppressed, and the strength of the casing can be further improved.

Furthermore, as shown in FIG. 4, the first housing reinforcement section 310 is provided with a positioning section in the groove section 312 of the lower case 160 for placing the musical instrument main body 100 at a specific position on the top surface of the stand 200. ing. For example, as shown in FIG. 1, in a configuration in which the positioning protrusion 202 is provided on the stand side, the positioning protrusion 202 on the top surface of the stand 200 fits into the groove 312 provided on the outer surface side of the lower case 160. A positioning recess 318 is provided. A plurality of positioning recesses 318 are provided near both ends of the groove 312 extending in the longitudinal direction of the lower case 160. Here, the positioning recess 318 is formed by setting the arrangement, shape, height, etc. of the ribs 314, 316 in the groove 312 so as to correspond to the shape, height, etc. of the positioning convex part 202 on the stand side. Ru. For example, when the positioning convex part 202 on the side of the stand 200 is cylindrical, as shown in FIG. At the same time, an arcuate support rib (support portion) 319 is provided so as to engage with the cylindrical outer peripheral surface of the positioning convex portion 202 .

Thereby, when placing and fixing the musical instrument main body 100 on the stand 200, positioning can be performed easily and reliably using the positioning recess 318 provided in the groove 312. Here, the strength of the lower case 160 is improved by providing lattice-like ribs 314 and 316 in the groove 312, so that the positioning recess 318 will not move when the lower case 160 or the musical instrument main body 100 is deformed. Changes and shifts in position can be suppressed, and the musical instrument main body 100 can be easily and reliably placed and fixed at a specific position on the stand 200.

Furthermore, as shown in FIG. A protrusion (projection) corresponding to the shape of the groove 312 is formed on the inner surface of the lower case 160. In this embodiment, the lower side in the drawing of the hammer holder (holding member) 426 that rotatably supports the hammer member 422 provided corresponding to each key in the keyboard unit 120 with respect to the upper surface of the protrusion in the drawing. The shapes and dimensions of the protruding portion (groove portion 312) and the hammer holder 426 are set so that the end portion is placed thereon. Here, the keyboard unit 120 including the hammer holder 426 is assembled to the lower case 160 by fastening and fixing both parts with a fastening member such as a screw with the hammer holder 426 placed on the protrusion (groove 312).

Thereby, when the keyboard unit 120 is assembled to the lower case 160, the hammer holder 426 can be supported from below by the protrusion corresponding to the groove 312. Here, since the strength of the lower case 160 is improved by the lattice-like ribs 314 and 316 provided in the groove 312, the lower case 160 is affected by the weight of the keyboard unit 120 and the impact and pressing force when keys are pressed. Also, deformation of the musical instrument body 100 can be suppressed. Further, since the protruding portion (groove portion 312) and the hammer holder 426 are fastened and fixed, it is possible to suppress the generation of abnormal noise and vibrations caused by the rotation of the hammer member when a key is pressed. Note that the detailed keyboard mechanism of the keyboard unit 120 will be described later.

Although the present embodiment has shown a configuration in which the ribs 314 and 316 are arranged in a lattice shape with square spaces within the groove portion 312, the present invention is not limited to this. The ribs of the first case reinforcing section 310 may have a structure that can increase the strength of the case in both the longitudinal and lateral directions of the lower case 160, and other reinforcing structures may be used. For example, the ribs 314 and 316 may be arranged in a truss shape having a triangular space within the groove portion 312 or in a honeycomb shape having a hexagonal space.

Further, in this embodiment, a groove 312 having a concave portion recessed from the outer surface side of the lower case 160 toward the inside of the musical instrument main body 100 is provided as the first case reinforcing portion 310, and ribs are arranged in a lattice shape in the groove 312. 314 and 316 are shown, but the present invention is not limited thereto. As the first case reinforcement part 310, the groove part 312 is not provided, and the area (first area) corresponding to the area where the groove part 312 is provided on the inner surface side of the lower case 160 (the inside side of the musical instrument main body 100) is provided. Ribs arranged in a lattice pattern may protrude and extend along the longitudinal direction of the lower case 160. In this embodiment as well, the strength of the lower case 160 can be improved as in the embodiment described above. Here, the longitudinal and lateral ends of the ribs arranged in a lattice pattern may be connected by frame-shaped ribs arranged so as to surround the outer periphery of the ribs. According to this, the frame-shaped rib has the same function as the side wall surface of the groove portion 312 shown in the embodiment described above, and the strength of the casing can be further improved.

(2) Second housing reinforcement section 320
FIG. 6 is a plan view of a main part showing the second case reinforcement section applied to the keyboard instrument according to the present embodiment, and FIGS. 7 and 8 are main part plan views showing the second case reinforcement section according to the present embodiment. FIG. 2 is a cross-sectional view of main parts showing a keyboard mechanism of a musical instrument body to which the above-described method is applied. Note that in FIGS. 7 and 8, cross sections are shown with the upper case omitted for convenience of illustration. FIG. 9 is a diagram illustrating an example of an interference state between the rib of the second housing reinforcement portion and the hammer member applied to the keyboard instrument according to the present embodiment. FIG. 10 is a plan view showing an example of the arrangement interval of the ribs of the second housing reinforcement section applied to the keyboard instrument according to the present embodiment.

Specifically, as shown in FIG. 3B and FIG. A rib (reinforcing member) 322 having one or more plate-like members extending in the lateral direction of the lower case 160 is disposed in a region corresponding to the gap between the hammer members 422 provided corresponding to each of the hammer members 422. has been done. The second housing reinforcement part 320 also includes a plurality of ribs 322 that extend in the longitudinal direction of the lower case 160 orthogonal to the lateral direction of the lower case 160 and that extend in the lateral direction. Ribs 324 are arranged. In this embodiment, as shown in FIGS. 6 and 7, one end side of the rib 322 extending in the transverse direction of the lower case 160 (the lower end side in FIG. 6, the left end side in FIG. 7) is as shown in FIG. The groove portion 312 protrudes from the inner surface of the lower case 160 in accordance with the shape of the groove portion 312 provided in the first case reinforcing portion 310, and is connected to the side wall surface of the protrusion extending in the longitudinal direction. That is, one or more ribs 322 are provided in a region (second region) adjacent to the region (first region) in which the groove 312 of the lower case 160 is provided, and are provided on the side wall surface of the protrusion corresponding to the groove 312. has a function as a rib 324, and the plurality of ribs 322 are connected to each other in the longitudinal direction.

Here, in order to describe the second housing reinforcement section 320 in detail, the keyboard mechanism of the keyboard unit applied to this embodiment will be described. Here, the keyboard mechanism of the white keys 122 will be explained, but the black keys 124 also have a similar keyboard mechanism.

As shown in FIG. 7, the keyboard mechanism of the keyboard unit includes a common keyboard chassis 126 to which white keys 122 and black keys 124 are attached so as to be rotatable in the vertical direction, and white keys 122 and black keys 124 attached to the keyboard chassis 126. It includes a hammer unit 420 for applying an action load in response to a key press operation on each of the black keys 124, and a switch section 410 that is turned on in response to a key press operation on the white key 122 and the black key 124. .

A front leg portion 402 that protrudes toward the white keys 122 at the top of the drawing is provided at the front end (left end in the drawing) of the keyboard chassis 126 on the user side with respect to the musical instrument body 100. . A key guide section 404 is provided at the top of the front leg section 402 to prevent horizontal swing in the key arrangement direction (perpendicular to the plane of the figure) when each white key 122 rotates. A stopper portion 406 is provided on the side (left side in the drawing) for regulating the upper limit position and lower limit position when the white key 122 rotates. Further, on the rear side (right side in the figure) of the front leg part 402 of the keyboard chassis 126, a unit attachment part 408 to which a hammer unit 420 is attached is provided so as to protrude upward in the figure.

Further, on the rear side (right side in the drawing) of the unit mounting portion 408 of the keyboard chassis 126, a sound generation board 412 is mounted which is equipped with a switch portion 410 that is turned on in response to a key press operation on the white key 122. There is. The sound generation board 412 is provided in common for a plurality of arranged white keys 122 and black keys 124, and a plurality of switches are provided on the sound generation board 412 so as to individually correspond to each of the white keys 122 and black keys 124. A section 410 is mounted. Further, the sound generation board 412 is equipped with a processing circuit that generates musical tone information based on an on signal output from the switch section 410 in response to a key press operation on the white key 122.

Further, a key mounting portion 414 is provided further rearward (right side in the drawing) of the board mounting portion of the keyboard chassis 126, and the rear end portion (right end in the drawing) of the white key 122 is connected to the white key 122. It is attached to the key attachment part 414 via a support shaft 416 that supports the key so as to be rotatable in the vertical direction. Further, a rear leg portion 418 that hangs down from the key mounting portion 414 is provided at the rear end portion of the keyboard chassis 126 (the right side end portion in the drawing). This rear leg portion 418 is provided with a stopper portion 419 for regulating the upper limit position and lower limit position when the hammer member 422 of the hammer unit 420 rotates in response to a key press operation on the white key 122. .

As shown in FIGS. 6 and 7, the hammer unit 420 is provided corresponding to each of the white key 122 and the black key 124, and rotates individually in response to a key press operation on each key to apply an action load. A hammer holder that is provided in common to the plurality of hammer members 422 to be applied and the plurality of white keys 122 and black keys 124 and rotatably supports the hammer members 422 corresponding to each key via a support shaft 424. 426. As shown in FIG. 7, the hammer holder 426 is attached to the lower surface side of the unit attachment portion 408 of the keyboard chassis 126 described above.

As shown in FIG. 7, the hammer member 422 includes a hammer main body 432 made of a metal material, a key connecting portion 434 that is a force point provided at one end side of the hammer main body 432 (left end side in FIG. 7), and a hammer A weight part 436 which is a load point part provided on the other end side of the main body 432 (right end side in FIG. 7) and a weight part 436 provided between the weight part 436 and the key connecting part 434 of the hammer main body 432 A support shaft 424 that rotatably supports the. Here, as shown in FIGS. 6 and 7, the weight part 436 of the hammer member 422 is larger in the longitudinal direction of the lower case 160 (of the key) than the hammer body 432 between the weight part 436 and the support shaft 424. By forming the lower case 160 to have a larger planar shape as seen from the direction of arrangement (arrangement direction) and thickness of the lower case 160 in the longitudinal direction (direction of arrangement of keys), the weight required to apply a predetermined action load to the keys is reduced. It is set. Note that although the hammer member 422 has approximately the same shape for the white key and the black key, the key pressing position and the shape of the key in the key pressing operation are different between the white key 122 and the black key 124. The hammer members 422 are designed to have slightly different planar shapes, thicknesses, weights, dimensions from the support shaft 424 to the weight portion 436 and the key connecting portion 434, and the like.

In the musical instrument body 100 equipped with the keyboard unit 120 having such a keyboard structure, when the user is not pressing any keys (initial state), the hammer member 422 is attached to the weight part 436 as shown in FIG. The weight portion 436 is urged to rotate clockwise around the support shaft 424, and the weight portion 436 comes into contact with a lower limit stopper portion 419 provided on the keyboard chassis 126, thereby regulating the lower limit position. Further, the key connecting portion 434 of the hammer member 422 pushes up the key, thereby regulating the key to the initial position which is the upper limit position.

Next, when the user performs a key press operation, the white key 122 or the black key 124 rotates counterclockwise about the support shaft 416, as shown in FIG. As a result, the key connecting portion 434 of the hammer member 422 is pressed down by the key, the hammer member 422 rotates counterclockwise around the support shaft 424, the weight portion 436 rises, and the weight of the weight portion 436 An action weight based on the key is given to the key. When the key connecting portion 434 of the hammer member 422 is further depressed by the key in response to a key depression operation, the weight portion 436 of the hammer member 422 further rises and comes into contact with the upper limit stopper portion 419 provided on the keyboard chassis 126. As a result, the rotation of the hammer member 422 is stopped, the upper limit position is regulated, and the lower limit position of the key is regulated (key lower limit state).

In this key pressing operation, if the switch section 410 attached to the keyboard chassis 126 is pressed and turned on by the key before the weight section 436 of the hammer member 422 comes into contact with the upper limit stopper section 419, the switch section 410 is turned on by the key. musical tone information is generated. Based on this musical tone information, a musical tone is generated in a sound source circuit built into the upper case 140, and is emitted from the speaker 148. Thereafter, when the user finishes pressing the key, the hammer member 422 rotates clockwise due to the weight of the weight portion 436, and the weight portion 436 contacts the lower limit stopper portion 419, thereby regulating the lower limit position. At the same time, the key connecting portion 434 pushes up the key and restricts it to the initial position, which is the upper limit position. In this manner, the hammer member 422 operates such that the weight portion 436 and the key connecting portion 434 each swing vertically about the support shaft 424.

In the lower case in which the keyboard unit having the keyboard mechanism as described above is assembled, the second housing reinforcement portion 320 is provided corresponding to each of the white keys 122 and the black keys 124, as shown in FIG. At least one rib (reinforcing member) 322 extending in the lateral direction of the lower case 160 is arranged in a region corresponding to the gap between the hammer members 422. Here, the ribs 322 are integrally molded using the same or equivalent resin material as the lower case 160. The shape, height, and thickness of the ribs 322 provided in the gaps between the hammer members 422 are based on the trajectory of the rotation (vertical swing) of the hammer member 422 shown in FIGS. 7 and 8, and the trajectory shown in FIG. When the instrument body 100 is placed vertically (or when the instrument body 100 is handled with the longitudinal direction facing up and down), the keys are shaken horizontally (swinging in the longitudinal direction) as shown in FIG. ) is set so that interference such as abutting, contacting, running over, etc. does not occur. For example, as shown in FIGS. 7 and 9(b), the height of the rib 322 (the protruding dimension on the inner surface side of the lower case 160) is set at the connection point with the rib 324 on the front side facing the user (on the left side in the drawing). ) It has a planar shape that becomes lower stepwise or continuously from the rear side (right side in the drawing) and a cutout.

As a result, as shown in FIG. 9(a), even if the hammer member 422 swings widely in the direction of arrangement of keys (vertical direction in the drawing), the hammer body 432 and the weight portion 436 of the hammer member 422 come into contact with each other. Since the height of the rib 322 is set low in the range where the hammer member 422 and the rib 322 move, interference between the hammer member 422 and the rib 322 can be avoided, and the generation of abnormal noises and vibrations caused by rotation and lateral vibration of the hammer member can be suppressed. can do. Note that the planar shape of the rib 322 may be any shape as long as it does not interfere with the rotation or lateral vibration of the hammer member 422, and for example, the rib 322 may have a planar shape in which the height decreases continuously in a linear or curved manner. It may be something that exists.

In addition, the number of ribs 322 and the spacing between the ribs 322 should be determined in order to improve the strength of the casing, as shown in FIG. 6, FIG. 7, or FIG. It is preferable that the length is set uniformly or substantially uniformly in the longitudinal direction, and the length extending in the lateral direction is preferably set as long as possible. Here, as mentioned above, in a keyboard instrument, since the key pressing positions and key shapes of the white keys 122 and the black keys 124 are different, there are The planar shape, thickness, weight, etc. of the hammer members 422 are set to be different. Therefore, the white key 122 and the black key 124 have different trajectories and lateral vibration ranges when the hammer member 422 rotates. Therefore, in this embodiment, as shown in FIG. 10, the plurality of ribs 322 are arranged regularly or substantially regularly in the longitudinal direction of the lower case 160, and the intervals between the ribs 322 are made to be as close as possible to each other. Set.

As a result, the plurality of ribs 322 can be arranged regularly or substantially regularly in the longitudinal direction of the lower case 160 without interfering with the rotation locus or lateral vibration range of the hammer member 422 when a key is pressed, while Since it can be extended as long as possible in the direction, it can be extended in the direction perpendicular to the lateral direction of the lower case 160 and the instrument body 100 while suppressing the generation of abnormal noise and vibration caused by the rotation of the hammer member when a key is pressed. The resulting deformation (bending) can be suppressed, and the strength of the casing can be improved.

Further, as shown in FIGS. 7 and 9(b), the second case reinforcing portion 320 has a height of a plurality of ribs 322 extending in the lateral direction of the lower case 160 (on the inner surface of the lower case 160). The end on the front side (left side in the drawing) where the protrusion dimension) is the highest is the side of the protrusion that protrudes toward the inner surface of the lower case 160 due to the groove 312 provided in the first housing reinforcement part 310 described above. connected to the wall.

Thereby, the side wall surface of the protrusion is applied as the rib 324, and the plurality of ribs 322 are connected to each other in the longitudinal direction of the lower case 160. Therefore, the ribs 322 extending in the lateral direction of the lower case 160 It is possible to improve the strength of the lower case 160 and the musical instrument main body 100, and to suppress deformation (bending) that occurs in a direction perpendicular to the longitudinal direction of the lower case 160 and the musical instrument main body 100, and deformation (twisting) that occurs in the direction of rotation around the longitudinal direction. This can further improve the strength of the casing. Further, in this case, since a part of the structure of the first case reinforcing section 310 (the side wall surface of the protrusion) is also used as the structure of the second case reinforcing section 320 (ribs 324), the musical instrument body The layout of the members inside 100 can save space.

(3) Third housing reinforcement section 330
FIG. 11 is a schematic perspective view showing the third housing reinforcement section applied to the keyboard instrument according to the present embodiment. FIG. 11(a) is an overall perspective view showing the lower case to which the third case reinforcement part is applied, and FIG. 11(b) is a main part perspective view showing the outer surface side of the lower case. FIG. 12 is a schematic cross-sectional view showing a musical instrument body to which the third case reinforcement part according to the present embodiment is applied. Note that FIG. 12 shows a cross section with the upper case omitted for convenience of illustration.

Specifically, as shown in FIG. 3(b), FIG. 11, and FIG. The musical instrument main body 100 is inserted from the outer surface of the lower case 160 into the region (third region) which is the region on the front side in the direction (lower side in FIG. 3(b), near side in FIG. 11) and extends in the longitudinal direction of the lower case 160. It has a concave portion recessed toward the inside (inner surface side of the lower case 160). Specifically, for example, on the inner surface side of the lower case 160, there are ribs 332 having a pair of plate-like members that closely face each other along the longitudinal direction of the lower case 160, and a rib 332 between the pair of ribs 332 and the outside thereof. A rib 334 having a plate-like member extending in the lateral direction of the lower case 160 perpendicular to the longitudinal direction and interconnecting the pair of ribs 332 is disposed on the side. Here, as shown in FIG. 12, the ribs 332, 334 are provided to protrude from the inner surface of the lower case 160 toward the white keys 122 of the keyboard unit 120 in the upper part of the figure, but the upper ends of the ribs 332, 334 The shapes and heights of the ribs 332 and 334 are set so that a gap is formed between the hanging portion of the rib 334 adjacent to the upper end and the keyboard chassis 126 of the keyboard unit 120.

In this way, a pair of ribs 332 that are continuous in the longitudinal direction and a rib 334 that connects the ribs 332 to each other in the transverse direction and extend outward are provided in the front region of the lower case 160. This makes it possible to suppress deformation (bending) that occurs in the direction perpendicular to the longitudinal direction of the lower case 160 and the musical instrument main body 100, and improve the strength of the housing. Furthermore, by making the ribs 332 and 334 protrude away from the keyboard unit 120 in the area of the lower case 160 directly below the key depression position, even when the user performs a key depression operation, Since the impact and pressing force are not directly transmitted to the lower case 160, deformation (bending) of the lower case 160 and the musical instrument body 100 can be suppressed, and the occurrence of abnormal noises and vibrations when keys are pressed can be suppressed. Can be suppressed.

Note that FIG. 3B shows an example in which the third case reinforcing portion 330 having the ribs 332 and 334 is divided into two parts in the longitudinal direction of the lower case 160. This is because the arrangement of the ribs 332 and 334 is divided in order to avoid the battery box that is provided near the longitudinal center of the lower case 160 and serves as a power source for driving the musical instrument body 100. The invention is not limited to this. By changing the layout design of the lower case 160, one continuous third case reinforcing section 330 may be arranged, or it may be divided into two or more parts and arranged. Good too.

Further, the ribs 332 and 334 are preferably arranged near mounting bosses or mounting holes for fastening and fixing the upper case 140 and the keyboard unit 120 that are assembled to the lower case 160 using fastening members such as screws. In this case, the ribs 332 and 334 are formed integrally with or connected to the mounting boss, and the upper case 140 and the keyboard unit 120 are fastened and fixed, or the upper case 140 and the keyboard unit 120 are fastened in the mounting hole. By fixing them, the strength of the housing can be improved even when the ribs 332 and 334 are formed of thin plate-like members, and the layout of the members inside the musical instrument main body 100 can save space. .

(4) Fourth housing reinforcement section 340
FIG. 13 is a schematic perspective view showing the fourth housing reinforcement section applied to the keyboard instrument according to the present embodiment. FIG. 13(a) is an overall perspective view showing the lower case to which the fourth case reinforcing part is applied, and FIGS. 13(b) and (c) are main part perspective views showing the fourth case reinforcing part. It is a diagram. FIG. 14 is a schematic cross-sectional view showing a musical instrument body to which the fourth case reinforcement part according to the present embodiment is applied. Note that in FIG. 14, a cross section is shown with the upper case omitted for convenience of illustration. FIG. 15 is a schematic diagram showing an example of cable arrangement inside the musical instrument main body to which the fourth case reinforcing section according to the present embodiment is applied. FIG. 15(a) is a diagram showing an example of speaker cable arrangement in a musical instrument body to which the fourth case reinforcement part is applied, and FIG. 15(b) is a diagram showing an example of speaker cable arrangement for comparison. It is.

Specifically, as shown in FIG. 3(b), FIG. 13, and FIG. 3(b) The upper side, the rear side of FIG. 13, and the area of FIG. A rib (reinforcing member) 342 having a pair of opposing plate members is arranged. Further, the fourth case reinforcing portion 340 includes a plate-like member that is located between the pair of ribs 342 and extends in the lateral direction of the lower case 160 that is orthogonal to the longitudinal direction to connect the pair of ribs 342 to each other. A rib 344 having a diameter is disposed. Here, the ribs 344 have substantially the same height as the ribs 342, as shown in FIG. As shown in FIGS. 13 and 14, the upper end portion of the rib 344 includes a sound source circuit board (circuit board) 146 and a speaker (sound generating section) that are incorporated into the upper case 140 and are arranged on the rear side of the keyboard unit 120. A slit portion 346 having a U-shaped or V-shaped groove is provided for storing and holding and fixing the speaker cable 150 connecting between the ribs 148 and the speaker cable 148 between the pair of ribs 342. Further, as shown in FIG. 15(a), the ribs 342 and 344 are arranged so that the speaker cable 150 disposed between the sound source circuit board 146 and the speaker 148 and the wiring and electronic components of the sound source circuit board 146 are flat. The height of protrusion from the lower case 160 is set so that they do not overlap or are not extremely close to each other when viewed.

In this way, by providing a pair of ribs 342 that are continuous in the longitudinal direction and a rib 344 that connects the ribs 342 in the lateral direction in the rear region of the lower case, the lower case 160 and the musical instrument main body 100 are Deformation (bending) that occurs in the direction perpendicular to the longitudinal direction can be suppressed, and the strength of the casing can be improved. In addition, a speaker cable 150 disposed between a sound source circuit board 146 housed inside the musical instrument body 100 and a speaker 148 is held by a slit portion 346 provided in a rib 344 that connects a pair of ribs 342. By fixedly storing the speaker cable 150 and the sound source circuit board 146 between the pair of ribs 342, it is possible to avoid the speaker cable 150 and the sound source circuit board 146 from overlapping in plan or being close to each other.

Here, as shown in FIG. 15(b), if the speaker cable 150 overlaps or is extremely close to the sound source circuit board 146, noise from the sound source circuit board 146 may be mixed in. As a result, the quality of musical tones produced by the speaker 148 tends to deteriorate. On the other hand, in the present embodiment, the heights of the ribs 342 and 344 are set so as to avoid as much as possible the two-dimensional overlap and proximity of the speaker cable 150 and the sound source circuit board 146, so that the speaker cable 150 and the sound source circuit board 146 are It is possible to improve the sound quality by suppressing noise from being mixed into the musical tones being produced. Further, in this case, since the incorporation of noise can be suppressed without changing the arrangement of the connector 147 of the speaker cable 150 provided on the sound source circuit board 146, the existing circuit board can be used as is.

Note that, as shown in FIG. 13, the rib 342 is disposed near the mounting boss 350 for fastening and fixing the upper case 140 and the keyboard unit 120 assembled to the lower case 160 with fastening members such as screws. The mounting boss 350 is formed integrally with the mounting boss 350 or connected to the mounting boss 350. As a result, even if the ribs 342 and 344 are formed of thin plate-like members, the strength of the housing can be improved, and the layout of the members inside the musical instrument main body 100 can save space.

In the embodiments described above, a plurality of different types of housing reinforcement parts according to the present invention have been described, but the electronic keyboard instrument according to the present invention may include all of these housing reinforcement parts. However, it may be provided with only one of the reinforcing portions, or may be provided with any combination of casing reinforcing portions.

Although several embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, but includes the invention described in the claims and equivalents thereof.
Below, the invention described in the original claims of the present application will be added.

(Additional note)
[1]
A force point part provided on one end side and pressed down when a key is pressed; a weight part provided on the other end side that applies a load to the key being pressed; and a weight part provided between the force point part and the weight part. a plurality of hammer members each having a fulcrum portion that swings vertically about the fulcrum portion when a key is pressed;
At least one reinforcement provided in a gap between the plurality of hammer members to prevent the weight from coming into contact even when each hammer member swings about the fulcrum in the direction in which the keys are arranged. a housing having a member;
A keyboard instrument characterized by comprising:

[2]
In the keyboard instrument described in [1],
The housing and the at least one reinforcing member are integrally formed,
The at least one reinforcing member includes a notch portion cut out so that the weight portion does not come into contact even when each of the hammer members swings about the fulcrum portion in the direction in which the keys are arranged; A keyboard instrument characterized by having.

[3]
In the keyboard instrument according to [1] or [2],
The casing has a first region in which a recessed portion is provided from the outer surface side toward the inner side along the arrangement direction of the keys,
A keyboard instrument, wherein the at least one reinforcing member is provided in a second region adjacent to the first region.

[4]
In the keyboard instrument described in [3],
a holding member that holds the plurality of hammer members by supporting the fulcrum part;
A keyboard instrument, wherein the holding member is placed on a convex portion within the housing corresponding to the first region.

[5]
In the keyboard instrument according to [3] or [4],
A keyboard instrument, wherein plate-like members are arranged in a lattice pattern within the first region.

[6]
In the keyboard instrument according to any one of [3] to [5],
A keyboard instrument, wherein the housing is provided with a positioning part in the first area for positioning the keyboard instrument on a stand on which it is placed.

[7]
In the keyboard instrument according to any one of [3] to [6],
The keyboard instrument is characterized in that the housing is provided with a recess that is recessed from the outer surface toward the inside along the arrangement direction of the keys in a third region corresponding to a key depression position.

[8]
In the keyboard instrument described in [7],
A keyboard instrument, wherein the housing is provided with another reinforcing member extending along the direction in which the keys are arranged in a fourth region behind the plurality of keys.

[9]
In the keyboard instrument described in [8],
A circuit board that generates a musical tone in response to a key press operation and a sound generating section that generates the musical tone are arranged behind the plurality of keys,
A keyboard instrument, wherein a cable connecting the circuit board and the sounding section is disposed inside the other reinforcing member.

100 Instrument body 120 Keyboard unit 122 White keys 124 Black keys 126 Keyboard chassis 140 Upper case 146 Sound source circuit board 148 Speaker 150 Speaker cable 160 Lower case 200 Stand 310 First housing reinforcement part 312 Groove 314, 316 Rib 320 Second Housing reinforcement portion 322, 324 Rib 330 Third housing reinforcement portion 332, 334 Rib 340 Fourth housing reinforcement portion 342, 344 Rib 346 Slit portion 410 Switch portion 420 Hammer unit 422 Hammer member 424 Support shaft 426 Hammer holder 432 Hammer body 434 Key connecting part 436 Weight part

Claims (9)

A casing and
a plurality of hammer members each having a weight portion that applies a load to a pressed key, and a fulcrum portion pivotally supported by a holding member;
Provided in the gap between two adjacent hammer members, the weight part is provided with a ring so as to prevent the weight part from coming into contact even when each hammer member swings about the fulcrum part in the direction in which the keys are arranged. a reinforcing member whose corresponding part is lower than other parts;
Equipped with
The reinforcing member is integrally formed with the casing.
keyboard instrument. The keyboard instrument according to claim 1,
The reinforcing member has a notch portion cut out so that the weight portion does not come into contact even when each of the hammer members swings in the direction in which the keys are arranged around the fulcrum portion. A keyboard instrument characterized by The keyboard instrument according to claim 1 or 2,
comprising a casing, the casing having a first region provided with a concave portion recessed from the outer surface side toward the inner side along the arrangement direction of the keys;
A keyboard instrument, wherein the reinforcing member is provided in a second region adjacent to the first region. The keyboard instrument according to claim 3,
The keyboard instrument is characterized in that the holding member is placed on a convex portion within the housing corresponding to the first region. The keyboard instrument according to claim 3 or 4,
A keyboard instrument, wherein plate-like members are arranged in a lattice pattern within the first region. The keyboard instrument according to any one of claims 3 to 5,
A keyboard instrument, wherein the housing is provided with a positioning part in the first area for positioning the keyboard instrument on a stand on which it is placed. The keyboard instrument according to claims 3 to 6,
The keyboard instrument is characterized in that the housing is provided with a recess that is recessed from the outer surface toward the inside along the arrangement direction of the keys in a third region corresponding to a key depression position. The keyboard instrument according to claim 7,
A keyboard instrument, wherein the housing is provided with another reinforcing member extending along the direction in which the keys are arranged in a fourth region behind the plurality of keys. The keyboard instrument according to claim 8,
A circuit board that generates a musical tone in response to a key press operation and a sound generating section that generates the musical tone are arranged behind the plurality of keys,
A keyboard instrument, wherein a cable connecting the circuit board and the sounding section is disposed inside the other reinforcing member.