JP7106060B2 - keyboard instrument - Google Patents

Description

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

2. Description of the Related Art Conventionally, in electronic keyboard instruments such as electronic pianos, various reinforcement methods have been applied in order to improve the housing strength of the instrument body. For example, in Patent Document 1, a plurality of drooping parts having a function of holding a voicing body (sound absorbing body) for improving the acoustic characteristics of an electronic keyboard instrument and a function of reinforcing a housing are provided. A housing structure is described that is arranged along the side wall surface of the housing and each hanging part is connected to the side wall surface of the housing via a connecting rib.

JP 2014-211618 A

The housing structure described in the first embodiment described above is effective in improving the strength around the sidewall surface of the housing, but has the following problems. That is, since an electronic keyboard instrument has a keyboard unit in which a plurality of keyboards are arranged, it inevitably has a housing elongated in the direction in which the keys are arranged. In an electronic keyboard instrument having such a housing, if the thickness of the housing member is designed to be thin in order to reduce the size and weight, the strength in the longitudinal direction of the housing will decrease, resulting in deformation such as bending and twisting. This can easily cause damage to the main body of the musical instrument, and can deteriorate the operability and acoustic characteristics of the musical instrument. Therefore, there is a demand for a housing structure that more effectively solves such problems.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a keyboard instrument that can be reduced in size and weight by effectively improving the strength of the housing.

A keyboard instrument according to the present invention is provided at one end of a keyboard instrument to be pressed down when a key is pressed; and a fulcrum portion provided between the weight portions, and the plurality of hammer members are arranged so that the hammer members swing vertically around the fulcrum portion when a key is depressed. and a rib-shaped reinforcing member extending upwardly from the lower case and extending in the longitudinal direction of the key, the reinforcing member comprising two adjacent keys. provided in the gap between the two hammer members and corresponding to the weights so that the weights do not come into contact with each other even when the hammers swing about the fulcrums in the arrangement direction of the keys. Part is lower than other parts.

According to the present invention, it is possible to effectively improve the housing strength of the keyboard instrument and reduce the size and weight.

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. It is a schematic diagram showing a lower case applied to a keyboard instrument according to one embodiment. FIG. 4 is a perspective view of a main part showing a first housing reinforcing part applied to the keyboard instrument according to one embodiment; FIG. 4 is a cross-sectional view of a main part showing a musical instrument main body to which a first housing reinforcing portion according to one embodiment is applied; FIG. 10 is a plan view of a main part showing a second housing reinforcement applied to the keyboard instrument according to one embodiment; FIG. 10 is a cross-sectional view (part 1) of a main part showing a keyboard mechanism of a musical instrument body to which a second housing reinforcing portion according to one embodiment is applied; FIG. 10 is a cross-sectional view (part 2) of a main part showing a keyboard mechanism of a musical instrument body to which a second housing reinforcing portion according to one embodiment is applied; FIG. 10 is a diagram showing an example of an interference state between the ribs of the second housing reinforcing portion and the hammer member applied to the keyboard instrument according to the embodiment; FIG. 10 is a plan view showing an example of an arrangement interval of ribs of a second housing reinforcing portion applied to a keyboard instrument according to one embodiment; FIG. 10 is a schematic perspective view showing a third housing reinforcement applied to the keyboard instrument according to one embodiment; FIG. 10 is a schematic cross-sectional view showing a musical instrument body to which a third housing reinforcing portion according to one embodiment is applied; FIG. 11 is a schematic perspective view showing a fourth housing reinforcement applied to the keyboard instrument according to one embodiment; FIG. 11 is a schematic cross-sectional view showing a musical instrument body to which a fourth housing reinforcing portion according to one embodiment is applied; FIG. 11 is a schematic diagram showing an example of cable arrangement inside a musical instrument body to which a fourth housing reinforcing portion according to one embodiment is applied;

EMBODIMENT OF THE INVENTION Hereinafter, the form for implementing this invention is demonstrated in detail, referring drawings.
(keyboard instrument)
FIG. 1 is an external view showing an embodiment of a keyboard instrument according to the present invention. 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 described as an example of a keyboard instrument, but it has a housing extending in a specific direction as its longitudinal direction, and produces musical tones in accordance with the user's (performer's) key-pressing operations. Any other electronic musical instrument may be used.

1A and 1B, the keyboard instrument according to the present invention includes an instrument body 100 of an electronic piano and a stand 200 on which the instrument body 100 is placed and fixed. . Here, in order to place the musical instrument body 100 at a specific position on the upper surface of the stand 200, as shown in FIG. (details will be described later) is provided on the lower surface side. The musical instrument main body 100 positioned on the upper surface of the stand 200 is fastened and fixed to the upper surface of the stand 200 by fastening parts (not shown) such as screws and bolts.

The musical instrument main 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 designated by the user's key depression.

The upper case 140 has a frame with an opening 142 through which each key of the keyboard unit 120 is exposed. and an operation panel 144 having a display panel for displaying information about the music being played, various setting information, and the like. In addition, the upper case 140 incorporates a tone generator circuit board 146 for generating musical tones corresponding to pitches designated by the user's key depression operations, a speaker 148 for generating the generated musical tones, and the like. The lower case 160 has the keyboard unit 120 and the upper case 140 assembled on the inner surface side (the upper surface side in the drawing), and the positioning recesses and screw holes for placing and fixing to the stand 200 on the outer surface side (the lower surface 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 (horizontal direction in the drawing) of the musical instrument body 100 . 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 individually mounted on a common keyboard chassis 126 so as to be vertically rotatable. In the keyboard unit 120, the keyboard portion on the front side (the front side in the drawing) exposed from the opening 142 of the upper case 140 is the region where the user performs key depression operations, and the rear side (the back side in the drawing) is the interior of the upper case 140. stored in. In the specification of the present application, the term "key" refers to items 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 surface side of the lower case corresponds to the lower surface side of the musical instrument body 100 shown in FIGS. It corresponds to the upper surface side of the case 160 .

In this embodiment, in order to improve the strength of the housing of the keyboard instrument, as shown in FIG. Each of the housing reinforcing parts 310 to 340 has a plurality of plate-shaped members extending in the longitudinal direction of the instrument body 100 or the lower case 160 and in the lateral direction of the instrument body 100 or the lower case 160 orthogonal to the longitudinal direction. It has ribs. Here, as shown in FIGS. 2 and 3, the longitudinal direction of the instrument body 100 or the lower case 160 corresponds to the arrangement direction of the keys of the keyboard unit 120, and the lateral direction of the instrument body 100 or the lower case 160 is As shown in FIG. 2, it is perpendicular 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 housing reinforcing sections 310 to 340 will be specifically described below.
(1) First housing reinforcing part 310
FIG. 4 is a perspective view of a main part showing the first housing reinforcing section applied to the keyboard instrument according to the present embodiment, and FIG. FIG. 2 is a cross-sectional view of a main part showing a musical instrument body; Note that FIG. 5 shows a cross section with the upper case omitted for convenience of illustration.

Specifically, as shown in FIG. 3( a ), the first housing reinforcing portion 310 is formed 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 . , continuous grooves 312 are provided. As shown in FIGS. 4 and 5, the groove portion 312 has a concave portion recessed from the outer surface side of the lower case 160 toward the inside of the musical instrument body 100 (the inner surface side of the lower case 160). A rib 314 having a plurality of plate members extending in the longitudinal direction of the case 160 and a rib 316 having a plurality of plate members extending in the width direction of the lower case 160 orthogonal to the longitudinal direction. They are arranged in a grid. Here, as shown in FIGS. 4 and 5, the ribs 314 and 316 have a height substantially equal to the depth of the groove 312 and are provided integrally within the groove 312 .

Thus, by providing the groove 312 continuous in the longitudinal direction of the lower case 160 and the ribs 314 and 316 arranged in a lattice pattern inside the groove 312, the thickness of each member can be reduced to reduce the size and weight of the musical instrument body 100. Even if the thickness is designed to be thin, it is possible to suppress deformation (deflection) occurring in the direction perpendicular to the longitudinal direction of the lower case 160 and the instrument body 100 including the lower case 160, thereby improving the strength of the housing. can be made Further, by widening the width of the groove portion 312 in the width direction of the lower case 160 and forming the rib 316 longer according to the width, the rotation direction of the lower case 160 and the musical instrument main body 100 is generated with the longitudinal direction as an axis. Deformation (twist) can also be suppressed, and the strength of the housing can be further improved.

Further, as shown in FIG. 4, the first housing reinforcing portion 310 is provided with a positioning portion for placing the musical instrument main body 100 at a specific position on the upper surface of the stand 200 within the groove portion 312 of the lower case 160. ing. For example, as shown in FIG. 1, in the form in which the positioning protrusions 202 are provided on the stand side, the positioning protrusions 202 on the upper surface of the stand 200 fit into the grooves 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 concave portion 318 is formed by setting the arrangement, shape, height, etc. of the ribs 314 and 316 in the groove portion 312 so as to correspond to the shape, height, etc., of the positioning convex portion 202 on the stand side. be. For example, if the positioning protrusion 202 on the stand 200 side is cylindrical, as shown in FIG. In addition, an arc-shaped support rib (support portion) 319 is provided so as to engage with the cylindrical outer peripheral surface of the positioning convex portion 202 .

As a result, when the musical instrument body 100 is placed and fixed on the stand 200 , positioning can be performed easily and reliably by the positioning concave portion 318 provided in the groove portion 312 . Grid-shaped ribs 314 and 316 are provided in the groove 312 to improve the strength of the lower case 160, so that the positioning recess 318 does not move when the lower case 160 or the musical instrument main body 100 deforms. Positional changes and deviations can be suppressed, and the musical instrument body 100 can be placed and fixed at a specific position on the stand 200 simply and reliably.

Further, as shown in FIG. 5, the first housing reinforcing portion 310 is provided so that the groove portion 312 is recessed from the outer surface side of the lower case 160 toward the inside of the musical instrument body 100, so that the inside of the musical instrument body 100 ( A projecting portion (convex portion) corresponding to the shape of the groove portion 312 is formed on the inner surface side of the lower case 160 . In the present embodiment, a hammer holder (holding member) 426 that rotatably supports a hammer member 422 provided corresponding to each key in the keyboard unit 120 is positioned downward in the drawing with respect to the upper surface of the projecting portion in the drawing. The shape and dimensions of the projection (groove 312) and hammer holder 426 are set so that the end is placed. Here, the keyboard unit 120 including the hammer holder 426 is assembled to the lower case 160 by fastening and fixing both with a fastening member such as a screw while the hammer holder 426 is placed on the protruding portion (groove portion 312).

As a result, when the keyboard unit 120 is assembled to the lower case 160 , the projections corresponding to the grooves 312 support the hammer holders 426 from below. Here, since the strength of the lower case 160 is improved by the grid-like ribs 314 and 316 provided in the groove 312, the weight of the keyboard unit 120 and the impact and pressing force at the time of key depression will not affect the lower case 160. Also, deformation of the musical instrument body 100 can be suppressed. Further, since the projecting portion (groove portion 312) and the hammer holder 426 are fastened and fixed, it is possible to suppress the occurrence of abnormal noise and vibration accompanying the rotation of the hammer member when the key is pressed. A detailed keyboard mechanism of the keyboard unit 120 will be described later.

In this embodiment, the ribs 314 and 316 are arranged in a grid pattern with square spaces in the grooves 312, but the present invention is not limited to this. The ribs of the first housing reinforcing portion 310 may have a structure capable of increasing the strength of the housing in both the longitudinal direction and the lateral direction of the lower case 160. Other reinforcing structures may be used. For example, a configuration in which the ribs 314 and 316 are arranged in a truss shape having a triangular space in the groove portion 312 or a honeycomb shape having a hexagonal space may be applied.

In this embodiment, as the first housing reinforcing portion 310, a groove portion 312 having a concave portion recessed from the outer surface side of the lower case 160 toward the inside of the musical instrument body 100 is provided. Although a configuration in which 314 and 316 are arranged is shown, the present invention is not limited to this. As the first housing reinforcement part 310, without providing the groove part 312, in 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 inner side of the musical instrument body 100). The ribs arranged in a lattice may protrude and extend along the longitudinal direction of the lower case 160 . Also in this form, the strength of the lower case 160 can be improved as in the above-described embodiment. Here, the ends in the longitudinal direction and the lateral direction 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 housing can be further improved.

(2) Second housing reinforcing part 320
FIG. 6 is a plan view of the main part showing the second housing reinforcing section applied to the keyboard instrument according to the present embodiment, and FIGS. 7 and 8 are the second housing reinforcing section according to the present embodiment. 1 is a cross-sectional view of a main part showing a keyboard mechanism of a musical instrument body to which is applied. 7 and 8, for convenience of illustration, the cross section is shown with the upper case omitted. FIG. 9 is a diagram showing an example of an interference state between the rib of the second housing reinforcing 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 an arrangement interval of ribs of the second housing reinforcing portion applied to the keyboard instrument according to the present embodiment.

Specifically, as shown in FIGS. 3B and 6, the second housing reinforcing portion 320 is provided on the inner surface side of the lower case 160. The white keys 122 and the black keys 124 arranged in the keyboard unit 120 A rib (reinforcing member) 322 having one or a plurality of plate-like members extending in the lateral direction of the lower case 160 is arranged in a region corresponding to the gap between the hammer members 422 provided corresponding to each of the It is Further, in the second housing reinforcing portion 320, a plurality of ribs 322 extending in the longitudinal direction of the lower case 160 perpendicular to the lateral direction of the lower case 160 are connected to each other. A rib 324 is arranged. In this embodiment, as shown in FIGS. 6 and 7, one end side (the lower end side in FIG. 6 and the left end side in FIG. 7) of the rib 322 extending in the transverse direction of the lower case 160 is Corresponding to the shape of the groove portion 312 provided in the first housing reinforcing portion 310, it protrudes toward the inner surface side of the lower case 160 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 a region (first region) in which the groove 312 of the lower case 160 is provided, and the side wall surface of the protrusion corresponding to the groove 312 is provided. function as ribs 324, and the plurality of ribs 322 are connected to each other in the longitudinal direction.

Here, in order to describe the second housing reinforcing portion 320 in detail, the keyboard mechanism of the keyboard unit applied to this embodiment will be described. Although the keyboard mechanism for the white keys 122 will be described here, the black keys 124 also have a similar keyboard mechanism.

The keyboard mechanism of the keyboard unit, as shown in FIG. A hammer unit 420 for applying an action load in response to a key depression operation on each of the black keys 124, and a switch section 410 that turns on in response to key depression operations on the white keys 122 and the black keys 124. .

A front leg portion 402 projecting toward the white keys 122 in the upper part of the drawing is provided at the front end of the keyboard chassis 126 (left end in the drawing), which is on the user side of the musical instrument body 100 . . A key guide portion 404 is provided on the upper portion of the front leg portion 402 to prevent lateral vibration in the key arrangement direction (perpendicular to the plane of the drawing) when the white keys 122 are rotated. A stopper portion 406 for regulating the upper limit position and the lower limit position when the white key 122 is rotated is provided on the side (left side in the drawing). A unit attachment portion 408 to which the hammer unit 420 is attached is provided on the rear side (right side in the drawing) of the front leg portion 402 of the keyboard chassis 126 so as to protrude upward in the drawing.

Also, on the rear side (on the right side in the drawing) of the unit mounting portion 408 of the keyboard chassis 126, a sounding board 412 mounted with a switch portion 410 that turns on in response to the depression of the white key 122 is mounted. there is The sounding board 412 is provided in common for the plurality of white keys 122 and black keys 124 arranged, and a plurality of switches are provided on the sounding board 412 so as to individually correspond to each of the white keys 122 and the black keys 124 . A unit 410 is mounted. Further, the sounding board 412 is equipped with a processing circuit for generating tone information based on the ON signal output from the switch section 410 in response to the key depression of the white key 122 .

A key mounting portion 414 is provided on the rear side (right side in the drawing) of the board mounting portion of the keyboard chassis 126, and the rear end portion of the white key 122 (right side end in the drawing) is attached to a key attachment portion 414 via a support shaft 416 that supports the key so as to be vertically rotatable. A rear leg portion 418 that hangs down from a key mounting portion 414 is provided at the rear end portion (the right end portion in the drawing) of the keyboard chassis 126 . The rear leg portion 418 is provided with a stopper portion 419 for regulating the upper limit position and the lower limit position when the hammer member 422 of the hammer unit 420 rotates according to the key depression operation on the white key 122 . .

As shown in FIGS. 6 and 7, the hammer units 420 are provided corresponding to the white keys 122 and the black keys 124, respectively, and rotate individually according to the key depression operation to each key to apply an action load. A plurality of hammer members 422 to be applied, and a hammer holder provided in common for the plurality of white keys 122 and black keys 124 and rotatably supporting the hammer members 422 corresponding to each key via a support shaft 424. 426 and . The hammer holder 426, as shown in FIG. 7, 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 provided at one end (the left end in FIG. 7) of the hammer main body 432, and a hammer A weight portion 436 which is a load point portion provided on the other end side of the main body 432 (the right end side in FIG. 7) is provided between the weight portion 436 of the hammer body 432 and the key connecting portion 434, and the hammer main body 432 and a support shaft 424 that rotatably supports the . Here, as shown in FIGS. 6 and 7, the weight portion 436 of the hammer member 422 is located in the longitudinal direction of the lower case 160 (the direction of the key) relative to the hammer body 432 between the weight portion 436 and the support shaft 424. The planar shape of the lower case 160 when viewed from the direction of arrangement) and the thickness of the lower case 160 in the longitudinal direction (direction of arrangement of the keys) are increased, so that the weight required to apply a predetermined action load to the keys is increased. is set. Although the hammer member 422 has substantially the same shape for the white keys and the black keys, the white keys 122 and the black keys 124 are different in key-pressing position, key shape, etc. , the planar shape, thickness and weight of the hammer member 422, and the dimensions from the support shaft 424 to the weight portion 436 and the key connecting portion 434 are designed to be slightly different.

In the musical instrument body 100 including the keyboard unit 120 having such a keyboard structure, when the user does not perform any key depression operation (initial state), the hammer member 422 is positioned above the weight portion 436 as shown in FIG. The weight urges the weight 436 to rotate clockwise about the support shaft 424, and the weight 436 comes into contact with the lower limit stopper 419 provided on the keyboard chassis 126, thereby restricting the lower limit position. Further, the key is regulated at the initial position, which is the upper limit position, by pushing up the key with the key connecting portion 434 of the hammer member 422 .

Next, when the user performs a key depression 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 pushed down by the key, and the hammer member 422 rotates counterclockwise around the support shaft 424 to raise the weight portion 436. A key is given an action weight based on When the key connecting portion 434 of the hammer member 422 is further pushed down by the key as the key is depressed, 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 restricted, and the lower limit position of the key is restricted (key lower limit state).

In this key depression operation, when the switch portion 410 attached to the keyboard chassis 126 is pressed by the key to turn on before the weight portion 436 of the hammer member 422 comes into contact with the upper limit stopper portion 419, the key is turned on. musical tone information is generated. Based on this musical tone information, a musical tone is generated in a tone generator circuit incorporated in the upper case 140 and emitted from the speaker 148 . After that, when the user ends the key depression operation, the hammer member 422 is rotated clockwise by the weight of the weight portion 436, and the weight portion 436 comes into contact with the lower limit stopper portion 419, thereby restricting the lower limit position. At the same time, the key connecting portion 434 pushes up the key and regulates 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 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 reinforcing 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 determined by the trajectory of the hammer members 422 during rotation (vertical rocking) shown in FIGS. When the musical instrument main body 100 is vertically placed (or when the musical instrument main body 100 is handled so that the longitudinal direction of the musical instrument main body 100 is the top and bottom), lateral vibration in the arrangement direction of the keys (longitudinal rocking) ) is set so as not to cause interference such as abutment, contact, or running over. For example, as shown in FIGS. 7 and 9B, the height of the rib 322 (projection dimension on the inner surface side of the lower case 160) is the user's front side (left side of the drawing). ) toward the rear side (right side of the drawing) in a stepwise or continuous manner, and has a notched portion.

As a result, as shown in FIG. 9(a), even if the hammer member 422 swings greatly in the key arrangement direction (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 are set to be low, interference between the hammer member 422 and the rib 322 can be avoided. can do. The planar shape of the rib 322 may be any shape as long as it does not interfere with the rotation and lateral vibration of the hammer member 422. For example, the rib 322 may have a planar shape in which the height continuously decreases linearly or curvedly. It can be anything that exists.

In order to improve the strength of the housing, the number of ribs 322 arranged and the intervals between the ribs 322 are determined such that a plurality of ribs 322 are arranged on the lower case 160 as shown in FIGS. It is preferable that it is set to be uniform or substantially uniform in the longitudinal direction, and that the length extending in the lateral direction is set to be as long as possible. As described above, in a keyboard instrument, the white keys 122 and the black keys 124 are different in key-pressing position, key shape, and the like. The planar shape, thickness, weight, etc. of the hammer members 422 are set to be different. Therefore, the trajectory of the hammer member 422 during rotation and the range of lateral deflection are different between the white key 122 and the black key 124 . Therefore, in the present embodiment, as shown in FIG. 10, a 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 arranged as closely as possible. set.

As a result, the plurality of ribs 322 are arranged regularly or substantially regularly in the longitudinal direction of the lower case 160 without interfering with the rotation trajectory or lateral swing range of the hammer member 422 when the key is depressed. Since it can extend as long as possible in the direction perpendicular to the width direction of the lower case 160 and the musical instrument main body 100, it is possible to suppress the occurrence of abnormal noise and vibration caused by the rotation of the hammer member when a key is pressed. The deformation (flexure) that occurs can be suppressed, and the strength of the housing can be improved.

Further, as shown in FIGS. 7 and 9B, the second housing reinforcing portion 320 has a height of a plurality of ribs 322 extending in the lateral direction of the lower case 160 (inner surface side of the lower case 160). protruding dimension) is the highest front side (left side in the drawing), the protruding portion side that protrudes to the inner surface side of the lower case 160 by the groove portion 312 provided in the first housing reinforcing portion 310 described above Connected to the wall.

As a result, the side walls of the projecting portion are used as ribs 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 are connected to each other. In addition, deformation (deflection) that occurs in the direction perpendicular to the longitudinal direction of the lower case 160 and the musical instrument body 100 and deformation (twist) that occurs in the rotational direction about the longitudinal direction can be suppressed. Also, the strength of the housing can be further improved. Further, in this case, the structure of part of the first housing reinforcing portion 310 (the side wall surface of the projecting portion) is also used as the structure of the second housing reinforcing portion 320 (the ribs 324), so that the musical instrument main body The layout of the members inside 100 can be made space-saving.

(3) Third housing reinforcing part 330
FIG. 11 is a schematic perspective view showing a third housing reinforcing section applied to the keyboard instrument according to this embodiment. FIG. 11(a) is an overall perspective view showing a lower case to which the third housing reinforcing portion is applied, and FIG. 11(b) is a perspective view showing the main part of 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 housing reinforcing portion according to this embodiment is applied. Note that FIG. 12 shows a cross section with the upper case omitted for convenience of illustration.

Specifically, as shown in FIGS. 3(b), 11, and 12, the third housing reinforcing portion 330 has a short edge corresponding to the key depression position of the white keys 122 arranged in the keyboard unit 120. As shown in FIGS. From the outer surface side of the lower case 160, the musical instrument main body 100 is inserted into a region (third region) extending in the longitudinal direction of the lower case 160, which is a region on the front side (lower side in FIG. 3(b), front side in FIG. 11). (inner surface side of the lower case 160). Specifically, for example, on the inner surface side of the lower case 160, ribs 332 having a pair of plate-like members facing each other closely along the longitudinal direction of the lower case 160, and between and outside the pair of ribs 332. A rib 334 having a plate-like member extending in the lateral direction of the lower case 160 perpendicular to the longitudinal direction and connecting the pair of ribs 332 to each other is arranged. Here, as shown in FIG. 12, the ribs 332, 334 are provided so as to protrude from the inner surface side of the lower case 160 toward the white keys 122 of the keyboard unit 120 in the upper part of the drawing. The shape and height of the ribs 332 and 334 are set so that a gap is formed between the keyboard chassis 126 of the keyboard unit 120 and the hanging part of the rib 334 adjacent to the upper end.

In this manner, a pair of ribs 332 that are continuous in the longitudinal direction and a rib 334 that connects the ribs 332 in the lateral direction and extends to the outside are provided in the region on the front side of the lower case 160. As a result, deformation (deflection) occurring in the direction perpendicular to the longitudinal direction of the lower case 160 and the musical instrument body 100 can be suppressed, and the strength of the housing can be improved. Further, by protruding ribs 332 and 334 away from the keyboard unit 120 in the region 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 (deflection) of the lower case 160 and the musical instrument main body 100 can be suppressed, and noise and vibration generated when keys are pressed can be suppressed. can be suppressed.

Note that FIG. 3B shows an example in which the third housing reinforcing portion 330 having ribs 332 and 334 is divided into two in the longitudinal direction of the lower case 160 and arranged. This is because the ribs 332 and 334 are arranged separately in order to avoid the battery box that is provided near the center in the longitudinal direction of the lower case 160 and serves as the driving power source for 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 housing reinforcing portion 330 may be arranged, or may be divided into two or more and arranged. good too.

Moreover, the ribs 332 and 334 are preferably arranged near attachment bosses and attachment holes 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. In this case, the ribs 332 and 334 are formed integrally with or connected to the mounting bosses, 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 holes. By fixing the ribs 332 and 334, even if the ribs 332 and 334 are formed of thin plate members, the strength of the housing can be improved, and the layout of the members inside the musical instrument body 100 can be made space-saving. .

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

Specifically, as shown in FIGS. 3(b), 13, and 14, the fourth housing reinforcing portion 340 is located on the inner surface side of the lower case 160 on the rear side of the musical instrument main body 100 in the transverse direction (see FIG. 14). 3(b), the region (fourth region) extending in the longitudinal direction of the lower case 160 on the rear side of the keyboard unit 120, which is the region of the upper side, the rear side of FIG. 13, and the region of FIG. A rib (reinforcing member) 342 having a pair of opposed plate-like members is arranged. Further, in the fourth housing reinforcing portion 340, a plate-like member is provided between the pair of ribs 342 and extends in the short side direction of the lower case 160 perpendicular to the longitudinal direction to connect the pair of ribs 342 to each other. A rib 344 having a . Here, the rib 344 has substantially the same height as the rib 342, as shown in FIG. As shown in FIGS. 13 and 14, a tone generator circuit board (circuit board) 146 and a speaker (sound generator) are mounted in the upper case 140 on the upper end portion of the rib 344 and 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 accommodating, holding and fixing the speaker cable 150 connecting between 148 and 148 between the pair of ribs 342 . 15(a), the ribs 342 and 344 are formed so that the speaker cable 150 arranged 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 the projection from the lower case 160 is set so that they do not overlap when viewed or are not extremely close to each other.

In this way, by providing a pair of ribs 342 continuous in the longitudinal direction and a rib 344 connecting the ribs 342 in the lateral direction in the region on the rear side of the lower case, the lower case 160 and the musical instrument body 100 can be Deformation (deflection) occurring in a direction perpendicular to the longitudinal direction can be suppressed, and the strength of the housing can be improved. Also, the speaker cable 150 arranged between the sound source circuit board 146 and the speaker 148 housed inside the musical instrument body 100 is held by the slit portion 346 provided in the rib 344 connecting the pair of ribs 342 . By fixing and storing between the pair of ribs 342, it is possible to prevent the speaker cable 150 and the sound source circuit board 146 from overlapping or coming close to each other.

Here, as shown in FIG. 15(b), when the speaker cable 150 planarly overlaps or is extremely close to the sound source circuit board 146, noise from the sound source circuit board 146 is mixed. As a result, the sound quality of musical tones generated from the speaker 148 tends to deteriorate. In contrast, in the present embodiment, the heights of the ribs 342 and 344 are set so as to avoid planar overlap and proximity between the speaker cable 150 and the sound source circuit board 146 as much as possible. It is possible to improve sound quality by suppressing noise from being mixed into the sounded musical tone. In this case, 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, so the existing circuit board can be used as it is.

13, the ribs 342 are arranged near mounting bosses 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. or formed integrally with the mounting boss 350 . As a result, even if the ribs 342 and 344 are made of thin plate members, the strength of the housing can be improved, and the layout of the members inside the musical instrument body 100 can be made space-saving.

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

Although several embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and includes the invention described in the claims and their equivalents.
The invention described in the original claims of the present application is appended below.

(Appendix)
[1]
A power point portion provided on one end side to be pushed down when a key is pressed, a weight portion provided on the other end side to apply a load to the key being pressed, and a weight portion provided between the power point portion and the weight portion. a plurality of hammer members each having a fulcrum portion and swinging vertically around the fulcrum portion when a key is depressed;
At least one reinforcement provided in the gap between the plurality of hammer members so that the weight portion does not abut even when each hammer member swings about the fulcrum portion in the arrangement direction of the keys. a housing having a member;
A keyboard instrument comprising:

[2]
In the keyboard instrument according to [1],
The housing and the at least one reinforcing member are integrally molded,
the at least one reinforcing member has a cutout portion cut out so that the weight portion does not come into contact with the hammer member even when the hammer member swings around the fulcrum portion in the arrangement direction of the keys; A keyboard instrument characterized by having

[3]
In the keyboard instrument according to [1] or [2],
The housing has a first region provided with a recess that is recessed from the outer surface toward the inside along the direction in which the keys are arranged,
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 according to [3],
a holding member that holds the plurality of hammer members by supporting the fulcrum,
A keyboard instrument, wherein the holding member is mounted on a projection in the housing corresponding to the first area.

[5]
In the keyboard instrument according to [3] or [4],
A keyboard instrument, wherein plate-shaped members are arranged in a grid pattern in 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 portion for positioning a stand on which the keyboard instrument is placed in the first area.

[7]
In the keyboard instrument according to any one of [3] to [6],
A keyboard instrument according to claim 1, wherein said housing is provided with a concave portion recessed inwardly from an outer surface side along an arrangement direction of said keys in a third region corresponding to a key depression position.

[8]
In the keyboard instrument according to [7],
A keyboard instrument according to claim 1, wherein said housing includes another reinforcing member extending along the direction in which said keys are arranged, provided in a fourth region behind said plurality of keys.

[9]
In the keyboard instrument according to [8],
A circuit board for generating musical tones corresponding to key depressions and a sound generator for producing the musical tones are arranged behind the plurality of keys,
A keyboard instrument, wherein a cable connecting said circuit board and said sound generator is disposed inside said other reinforcing member.

REFERENCE SIGNS LIST 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 312 groove 314, 316 rib 320 second Case reinforcement part 322, 324 Rib 330 Third case reinforcement part 332, 334 Rib 340 Fourth case reinforcement part 342, 344 Rib 346 Slit part 410 Switch part 420 Hammer unit 422 Hammer member 424 Support shaft 426 Hammer holder 432 Hammer main body 434 Key connecting part 436 Weight part

Claims (4)

A power point portion provided on one end side to be pushed down when a key is pressed, a weight portion provided on the other end side to apply a load to the key being pressed, and a weight portion provided between the power point portion and the weight portion. a plurality of hammer members having :
a lower case provided with a holding member holding the plurality of hammer members so that the hammer members swing vertically around the fulcrum when a key is depressed;
a rib-shaped reinforcing member extending upward from the lower case and extending in the longitudinal direction of the key ;
with
The reinforcing member is provided in the gap between the two adjacent hammer members so that the weight portion does not come into contact with the hammer member even when each hammer member swings about the fulcrum portion in the direction in which the keys are arranged. (2 ) a keyboard instrument, wherein a portion corresponding to the weight portion is lower than other portions; The keyboard instrument according to claim 1,
The keyboard instrument, wherein the reinforcing member is formed integrally with the lower case and provided to reinforce strength of the lower case in the front-rear direction . The keyboard instrument according to claim 1 or 2,
The hammer member has a hammer body between the weight and the fulcrum,
The weight portion has a thickness in the direction in which the keys are arranged, which is larger than that of the hammer body, and a lower limit is provided for downward movement,
The reinforcing member has a first lower portion of the hammer body extending above the lower limit, and a second lower portion of the weight portion not extending above the lower limit. instrument. The keyboard instrument according to any one of claims 1 to 3 ,
The reinforcing member has a notched portion so that the weight portion does not come into contact with the hammer member even when the hammer member swings about the fulcrum portion in the direction in which the keys are arranged. instrument.

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