JP7197838B2 - keyboard instrument - Google Patents

Description

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

For example, in a keyboard instrument, as described in Patent Document 1, a plurality of sound emitting holes elongated in the left-right direction are formed in the front portion above the rear of a plurality of keys in a musical instrument case having a plurality of keys and a speaker. A structure is known in which a sound emitting part is provided and the sound of the speaker is emitted from the sound emitting part toward the front of the musical instrument case.

JP 2014-211618 A

In such a keyboard instrument, the plurality of sound emitting holes of the sound emitting section are elongated in the direction in which the keys are arranged and are arranged in the vertical direction. By providing them at predetermined intervals, the sound emitting portion is reinforced.

However, since such a keyboard instrument has a structure in which a plurality of partition ribs are provided in a plurality of sound emitting holes, sufficient strength of the sound emitting portion cannot be ensured unless the thickness of the instrument case is thickened. I have a problem that I can't.

SUMMARY OF THE INVENTION The problem to be solved by the present invention is to provide a keyboard instrument capable of securing sufficient strength even if the thickness of the case is thin.

According to one aspect of the present invention, there is provided a keyboard having a plurality of keys, housing the keyboard so as to expose the operating surfaces of the plurality of keys, and having a rear end side higher than the operating surface of the plurality of keys. a case having a front portion provided with a sound emitting hole for emitting the sound of the speaker forward at a position, the case connecting to the front portion and extending rearward of the front portion; 1 reinforcing rib, and a second reinforcing rib connected to the first reinforcing rib and extending in the arrangement direction of the plurality of keys .

According to the present invention, sufficient strength can be ensured even if the thickness of the case is reduced.

1 is a perspective view showing an embodiment of a keyboard instrument to which the invention is applied; FIG. 2 is a front view of the keyboard instrument shown in FIG. 1; FIG. Figure 2 is a rear view of the keyboard instrument shown in Figure 1; 3 is an enlarged front view showing a portion of the keyboard instrument shown in FIG. 2; FIG. FIG. 3 is an enlarged cross-sectional view of the keyboard instrument shown in FIG. 2 taken along line AA. 3 is an enlarged cross-sectional view showing the main part of the keyboard instrument shown in FIG. 2, taken along the line BB. FIG. 2 is a perspective view showing the inner side of the upper case of the keyboard instrument shown in FIG. 1; FIG. FIG. 8 is a perspective view showing an upper case shown in FIG. 7; FIG. 9 is an enlarged front view of the main part of the upper case shown in FIG. 8 as seen from the front side; FIG. 10 is an enlarged front view showing a part of the sound emitting portion of the upper case shown in FIG. 9; FIG. 9 is an enlarged perspective view showing a main part of the upper case shown in FIG. 8; FIG. 12 is an internal view showing a main part of the upper case shown in FIG. 11; FIG. 10 is an enlarged cross-sectional view of the upper case shown in FIG. 9 taken along line CC; FIG. 10 is an enlarged cross-sectional view of the upper case shown in FIG. 9 taken along line DD;

An embodiment of a keyboard instrument to which the present invention is applied will be described below with reference to FIGS. 1 to 14. FIG.
As shown in FIGS. 1 to 3, this keyboard instrument has a horizontally long musical instrument case 1 extending in the horizontal direction. This musical instrument case 1 comprises an upper case 2 and a lower case 3.

As shown in FIGS. 1 to 3, the upper case 2 is provided with an open portion 2a over approximately half or more of the front side and the upper portion of the front side except for the rear side and both side portions of the upper surface. It is shaped like a horizontally long box with open sides. The lower case 3 is formed in a horizontally long box shape that is opened upward. Thus, the musical instrument case 1 has a structure in which the lower outer periphery of the upper case 2 is arranged and joined to the upper outer periphery of the lower case 3 . In this case, the upper surface of the upper case 2 is provided with a volume switch SW1 and a plurality of push button switches SW2.

Further, inside the musical instrument case 1, as shown in FIGS. 1 to 7, a keyboard section 4 and a plurality of speakers 5 are provided. As shown in FIG. 5, the keyboard section 4 includes a keyboard chassis 6 arranged in the lower case 3, a plurality of keys 7 arranged on the keyboard chassis 6, and an action load applied to each of the plurality of keys 7. It has a plurality of hammer members 8 to apply and a plurality of switch portions 9 that perform switch operations according to key depression operations of the plurality of keys 7 .

The multiple keys 7 have multiple white keys 10 and multiple black keys 11, as shown in FIGS. As shown in FIG. 5, each of the plurality of white keys 10 has its rear portion rotatably attached to a key support portion 12 provided on the rear end portion of the keyboard chassis 6, and its front end portion to the front end portion of the keyboard chassis 6. The white key guide portion 13a of the keyboard chassis 6 guides the white key in the vertical direction.

As shown in FIGS. 1, 2, and 4 to 6, each of the plurality of black keys 11 is shorter in the front-rear direction than the white key 10 in the front-rear direction, and is taller than the rear part. is formed higher than the white key 10. That is, each of the plurality of black keys 11 has its rear portion at the same height as each rear portion of each of the plurality of white keys 10, as shown in FIG.

As shown in FIG. 5, each of the plurality of black keys 11 has its rear portion rotatably attached to the key support portion 12 of the keyboard chassis 6, and its front portion is attached to the black key of the keyboard chassis 6, similarly to the white key 10. It is adapted to be guided in the vertical direction by the guide portion 13b. In this case, the key support portion 12 is formed slightly higher than the rear portions of the white keys 10 and the black keys 11 .

As a result, when the plurality of keys 7 are arranged in the musical instrument case 1 as shown in FIG. , are exposed upward corresponding to the opening 2a of the upper case 2. As shown in FIG. In this case, each of the plurality of black keys 11 is inclined so that the front side is higher and the rear side is gradually lower. The plurality of black keys 11 are formed such that the height on the front side thereof is the same as or slightly lower than the upper surface of the upper case 2 .

Each of the plurality of hammer members 8 includes a hammer body 15, a weight portion 16, a shaft portion 17, and a key interlocking portion 18, as shown in FIG. attached to the In this case, the plurality of hammer members 8 includes hammer members 8a for white keys and hammer members 8b for black keys. The hammer member 8a for the white key is longer than the hammer member 8b for the black key, and the hammer body 15 has a different shape from the hammer body 15 of the hammer member 8b for the black key.

As a result, as shown in FIG. 5, each of the plurality of hammer members 8 rotates counterclockwise around the shaft portion 17 where the hammer body 15 is attached to the hammer support portion 14 of the keyboard chassis 6 by the weight of the weight portion 16. Then, the lower end portion of the weight portion 16 comes into contact with the lower limit stopper 20, and in this state, the key interlocking portion 18 pushes up the key 7 to restrict it to the initial position.

As shown in FIG. 5, each of the plurality of hammer members 8 is operated by pressing the key 7, and the key interlocking portion 18 is pushed down against the weight of the weight portion 16 by the depressed key 7. When pressed, the hammer body 15 rotates clockwise about the shaft 17 attached to the hammer support 14 of the keyboard chassis 6, applies an action load to the key 7, and pushes the upper end of the weight 16 to the upper limit. It is designed to be brought into contact with the stopper 21 .

As shown in FIG. 5, each of the plurality of switch units 9 includes a switch board 9a provided on the keyboard chassis 6, and a swollen rubber 9b provided on the switch board 9a and corresponding to each key 7. I have. When the key 7 is pressed, the pressing portion 7a of the key 7 elastically deforms the bulging rubber 9b, and the movable contacts in the bulging rubber 9b are moved to the switch substrate 9a. A switch signal is output by contacting a fixed contact (both not shown).

By the way, as shown in FIGS. 5 to 7, the plurality of speakers 5 are provided on both sides in the left and right direction inside the upper case 2 so as to face the back side of the upper case 2 . That is, the plurality of speakers 5 are attached to the left and right rear surfaces of the upper case 2, respectively. Thus, each of the plurality of speakers 5 is arranged between the rear portion of the keyboard chassis 6 of the keyboard section 4 and the rear surface of the upper case 2 toward the rear surface of the upper case 2 .

In this case, as shown in FIGS. 3, 5, and 6, a plurality of first sound emitting units 22 for emitting musical sounds generated by the speaker 5 are provided on the left and right rear surfaces of the upper case 2. 5, respectively. A large number of holes are provided in each of these first sound emitting portions 22 . As a result, the first sound emitting section 22 emits the musical sound generated by the speaker 5 from the rear surface of the musical instrument case 1 toward the rear.

1, 4, 9 and 10, a plurality of front portions 23 are formed at the front end of the upper portion of the upper case 2, that is, at the edge of the rear side of the open portion 2a of the upper case 2. It is provided corresponding to the upper side of each rear portion of the key 7 . A second sound emitting portion 24 is provided on each of the left and right sides of the front portion 23 . In the second sound emitting portion 24, slit-like sound emitting holes 24a elongated in the left-right direction are arranged in two stages.

In this case, as shown in FIGS. 1, 2, 4, and 6 to 9, the second sound emitting section 24 is longer than the first sound emitting section 22 in the horizontal direction. That is, the second sound emitting part 24 is provided from a position corresponding to the speaker 5 toward the central side of the front part 23 of the upper case 2 with a length about twice the length of the speaker 5 in the left-right direction. there is As shown in FIGS. 5 to 10, on the inner surface of the front surface portion 23 of the upper case 2 provided with the second sound emitting portion 24, a plurality of first reinforcing ribs 25 are formed along the direction in which the plurality of keys 7 are arranged. are provided at predetermined intervals.

That is, as shown in FIGS. 11 to 14, each of the plurality of first reinforcing ribs 25 has a vertical plate shape in which the length S1 in the front-rear direction of the keys 7 is longer than the length S2 (thickness) in the arrangement direction of the keys 7. (see FIG. 12). Each of the plurality of first reinforcing ribs 25 extends vertically across the plurality of sound emitting holes 24a from the inner surface of the upper surface of the upper case 2 to the lower end of the front surface portion 23 of the upper case 2. , extending toward the back of the upper case 2 .

In this case, as shown in FIGS. 11 to 14, the lower ends of the plurality of first reinforcing ribs 25 are arranged on the same plane at the same height as the lower end surface of the front surface portion 23 of the upper case 2 . . As a result, the plurality of first reinforcing ribs 25 strongly reinforce the upper surface portion and the front surface portion 23 of the upper case 2 even if the thickness of the upper surface portion and the front surface portion 23 of the upper case 2 is thin. It's becoming

In this case, among the plurality of first reinforcing ribs 25, the plurality of first reinforcing ribs 25 corresponding to the second sound emitting portion 24 are, as shown in FIGS. Even if the thickness is formed thin and the second sound emitting portion 24 is provided with a plurality of slit-like sound emitting holes 24a, the sound from the inner surface of the upper surface of the upper case 2 to the lower end portion of the front surface portion 23 of the upper case 2 is The second sound emitting portion 24 is strongly reinforced by being provided so as to traverse the plurality of sound emitting holes 24a.

Further, among the plurality of first reinforcing ribs 25, at least the plurality of first reinforcing ribs 25 corresponding to the second sound emitting portion 24 are arranged to correspond to the plurality of black keys of the keyboard portion 4, as shown in FIGS. 11, respectively. As a result, the plurality of first reinforcing ribs 25 corresponding to the second sound emitting portions 24 are arranged on the front portion 23 of the upper case 2 so that the second sound emitting portions 24 are arranged above the respective rear portions of the plurality of keys 7 . are hidden by the plurality of black keys 11 so as not to be seen from the front when the keyboard unit 4 is viewed from the front.

Further, as shown in FIGS. 11 to 14, on the inner surface of the upper surface of the upper case 2, on the rear side of the plurality of first reinforcing ribs 25, a long frame-like shape extending along the arrangement direction of the plurality of first reinforcing ribs 25 is provided. A second reinforcing rib 26 is provided. The second reinforcing rib 26 has a pair of long side portions 26a parallel to the front surface portion 23 of the upper case 2, and short side portions 26b provided between the pair of long side portions 26a at a predetermined interval. , the whole is formed in the shape of an elongated frame.

That is, as shown in FIGS. 11 to 14, the second reinforcing rib 26 is shaped like a horizontally long frame in which the length S3 (width) in the front-rear direction of the keys 7 is shorter than the length S4 in the arrangement direction of the keys 7. formed (see FIG. 12). A plurality of first reinforcing ribs 25 are connected to the long side portions 26a of the second reinforcing ribs 26, respectively. As a result, the plurality of first reinforcing ribs 25 and second reinforcing ribs 26 further strongly reinforce the upper surface of the upper case 2 and the front surface portion 23, thereby preventing bending of the upper case 2 and the front surface portion 23. and to prevent twisting.

In this case, as shown in FIGS. 5 and 6, the second reinforcing ribs 26 are provided on the keyboard chassis 6 to allow the keys 7 to rotate when the upper case 2 overlaps the lower case 3. It is provided corresponding to a plurality of key supporting portions 12 to be supported. As a result, the second reinforcing ribs 26 are arranged and supported by the upper end portions of the plurality of key supporting portions 12 provided on the keyboard chassis 6 . That is, the plurality of key support portions 12 provided on the keyboard chassis 6 protrude upward from the respective rear portions of the plurality of keys 7. Therefore, even if the second reinforcing ribs 26 are arranged at the upper end portions of the plurality of key support portions 12, the plurality of key support portions 12 can be so as not to hinder the rotation of the key 7.

Further, as shown in FIGS. 11 to 14, the second reinforcing rib 26 has a portion of the second sound emitting portion 24 positioned closer to the middle portion in the left-right direction on the front portion 23 of the upper case 2 than the speaker 5. A sound escape portion 27 in which the second reinforcing rib 26 does not exist is provided in a partial region corresponding to the second sound emitting portion 24 . The sound escape part 27 is a place where the second reinforcing rib 26 is not provided, and the sound produced by the speaker 5 is not blocked by the second reinforcing rib 26, thereby improving the sound escape. .

In this case, as shown in FIGS. 11 to 14, a frame-shaped auxiliary reinforcing rib 27a having a short length in the left-right direction is provided in the intermediate portion of the sound escape portion 27. As shown in FIGS. The auxiliary reinforcing ribs 27a are provided to prevent the strength of the upper case 2 from decreasing when the length of the sound escape portion 27 in the left-right direction is long. When arranged, it is supported by the key support portion 12 of the keyboard chassis 6 in the same manner as the second reinforcing rib 26 .

Further, as shown in FIG. 5, belt-like felt 28 is attached to the lower end of the front surface portion 23 of the upper case 2 and the lower ends of the plurality of first reinforcing ribs 25 along the entire length of the front surface portion 23 of the upper case 2. affixed across. In this case, as shown in FIGS. 11 to 14, position regulating portions 25a for regulating the front and rear positions of the felt 28 are provided at the lower ends of the plurality of first reinforcing ribs 25, respectively. As a result, the front end of the felt 28 is aligned with the front surface portion 23 of the upper case 2 because the front and rear positions of the felt 28 are regulated by the position regulating portion 25 a of the first reinforcing rib 25 .

Next, the operation of such a keyboard instrument will be described.
When performing with this keyboard instrument, a plurality of keys 7 may be pressed. That is, when a plurality of keys 7 are pressed, the pressed key 7 pushes down the key interlocking portion 18 of the hammer member 8 and rotates the hammer body 15 around the shaft portion 17 of the hammer member 8. As the member 8 rotates, an action load is applied to the pressed key 7 .

At this time, the pressing portion 7a of the depressed key 7 presses the swollen rubber 9b of the switch portion 9 to elastically deform it, so that the movable contact in the swollen rubber 9b comes into contact with the fixed contact of the switch board 9a. Output switch signal. Then, based on the switch signal of the switch 9, a sound generator (not shown) generates musical tone data and causes the plurality of speakers 5 to generate musical tones.

At this time, musical tones generated by the plurality of speakers 5 are emitted from the first sound emitting portion 22 provided on the rear surface of the upper case 2 toward the rear of the musical instrument case 1, that is, toward the audience. At this time, the bass musical tones among the musical tones generated by the plurality of speakers 5 are emitted from the musical instrument case 1 through the plurality of sound emitting holes 24 a of the second sound emitting portion 24 provided in the front portion 23 of the upper case 2 . Sound is emitted toward the front, that is, toward the performer.

In this way, when the sound of the speaker 5 is emitted from the plurality of sound emission holes 24a of the second sound emission section 24 provided in the front surface portion 23 of the upper case 2, the plurality of emission holes of the second sound emission section 24 Even if the sound hole 24a is formed in the front part 23 of the upper case 2 in a slit-like shape elongated in the left-right direction, the second sound emitting part 24 is reinforced by the first reinforcing ribs 25, so that a plurality of sound emitting parts can be formed. It is possible to prevent the generation of abnormal noise caused by the vibration of the second sound emitting portion 24 due to the sound passing through the hole 24a.

Further, at this time, since the frame-shaped second reinforcing rib 26 is provided with the sound escape portion 27, even if part of the musical sound generated by the speaker 5 is blocked by the second reinforcing rib 26, the sound is Another part of the generated musical tones is emitted from the plurality of sound emitting holes 24a of the second sound emitting portion 24 through the sound omission portion 27, so that the musical tones emitted by the speaker 5 are also emitted from the front side of the musical instrument case 1. Sound is emitted favorably toward the performer side.

By the way, on the inner surface of the front surface portion 23 of the upper case 2 of the musical instrument case 1, a first reinforcing rib 25 is provided from the inner surface of the upper surface of the upper case 2 to the lower end portion of the front surface portion 23. An upper surface portion and a front surface portion 23 of the case 2 are reinforced. Therefore, even if the thickness of the upper surface portion and the front surface portion 23 of the upper case 2 is reduced, the strength of the upper surface portion and the front surface portion 23 of the upper case 2 is ensured.

Further, the frame-shaped second reinforcing ribs 26 are provided on the inner surface of the upper surface of the upper case 2 so as to extend along the arrangement direction of the plurality of first reinforcing ribs 25, thereby reinforcing the upper surface of the upper case 2. there is Therefore, even if the thickness of the upper surface of the upper case 2 is reduced, the strength of the upper surface of the upper case 2 is ensured.

That is, the frame-shaped second reinforcing rib 26 includes a pair of long side portions 26a parallel to the front surface portion 23 of the upper case 2 and short side portions 26b provided between the pair of long side portions 26a at a predetermined interval. , and the upper surface of the upper case 2 is strongly reinforced by the frame-shaped second reinforcing ribs 26 because the whole is formed in a long and narrow frame shape. Therefore, even if the thickness of the upper surface of the upper case 2 is reduced, the bending of the upper surface of the upper case 2 can be prevented.

In this case, since the plurality of first reinforcing ribs 25 are connected to the frame-shaped second reinforcing rib 26 , the plurality of first reinforcing ribs 25 and the frame-shaped second reinforcing rib 26 support the entire upper case 2 strength is further enhanced. Therefore, even if the thickness of the upper surface portion and the front surface portion 23 of the upper case 2 is reduced, the bending and twisting of the upper case 2 as a whole can be reliably prevented.

Further, the frame-shaped second reinforcing rib 26 is arranged and supported on the key supporting portion 12 of the keyboard chassis 6 provided on the lower case 3 when the upper case 2 is arranged on the lower case 3 . As a result, the strength of the upper case 2 is also ensured, and the strength of the musical instrument case 1 as a whole is also ensured.

As described above, in the musical instrument case 1, the upper case 2 is strongly reinforced by the plurality of first reinforcing ribs 25 and the frame-shaped second reinforcing ribs 26, so that the thickness of the upper case 2 can be reduced. As a result, the material cost of the upper case 2 can be reduced and the cost can be reduced, and the weight of the upper case 2 can be reduced so that the musical instrument case 1 can be easily carried.

In addition, since the musical instrument case 1 does not have a sound emitting portion on the top surface of the upper case 2, the strength of the upper case 2 is ensured. Intrusion of dust into the housing is reduced, the appearance becomes neater, and the design is improved.

In this case, the plurality of first reinforcing ribs 25 of the second sound emitting portion 24 provided on the front surface portion 23 of the upper case 2 are arranged in the plurality of keys 7 at substantially the same height as the upper surface of the upper case 2 . By being provided corresponding to the black keys 11, even if the plurality of sound emitting holes 24a of the second sound emitting portion 24 are visible from between the black keys 11 when the instrument case 1 is viewed from the front, the plurality of Since the first reinforcing ribs 25 are hidden by the plurality of black keys 11, the overall appearance of the musical instrument case 1 is also neat and the design is improved.

Furthermore, a band-shaped felt 28 is attached to the lower end of the front surface portion 23 of the upper case 2 and the lower ends of the plurality of first reinforcing ribs 25 over the entire length of the front surface portion 23 of the upper case 2 . Therefore, in addition to preventing the plurality of keys 7 from directly contacting the lower end portion of the front surface portion 23 of the upper case 2 and buffering, foreign matter such as dust entering through the plurality of sound emission holes 24a of the second sound emission portion 24 is prevented. Intrusion into the musical instrument case 1 is reduced.

In this case, each of the plurality of first reinforcing ribs 25 is provided with a position restricting portion 25a that restricts the position of the felt 28 in the front-rear direction. The front and rear positions of the felt 28 are regulated so that the front end of the felt 28 is accurately aligned with the front surface portion 23 of the upper case 2, thereby improving the appearance and design.

Thus, according to this keyboard instrument, the keyboard section 4 having the plurality of keys 7 and the sound emitting holes 24a for emitting the sound of the speaker 5 forward are provided at the rear end side of the plurality of keys 7. and a musical instrument case 1 having at least one first reinforcing rib 25 provided inside the front part 23 corresponding to the sound emitting hole 24a, and at least one first 1 Reinforcement rib 25 ensures sufficient strength even if the upper case 2 is thin because the length S1 of the key 7 in the front-rear direction is longer than the length S2 of the plurality of keys 7 in the arrangement direction. be able to.

That is, in this keyboard instrument, the plurality of first reinforcing ribs 25 have a vertical plate shape in which the length S1 in the front-rear direction of the keys 7 is longer than the length S2 (thickness) of the plurality of keys 7 in the arrangement direction. By arranging in the arrangement direction of 7, the upper case 2 and the second sound emitting portion 24 can be reinforced. The strength of the portion 24 can be sufficiently ensured.

Further, in this keyboard instrument, the second sound emitting part 24 has a plurality of sound emitting holes 24 a long in the arrangement direction of the keys 7 for emitting the sound of the speaker 5 to the front of the upper case 2 . By arranging them in the vertical direction in the part 23, the sound generated by the speaker 5 can be emitted well to the front side of the upper case 2 from a plurality of sound emitting holes 24a provided in the front part 23 of the upper case 2. Therefore, the player can hear the sound generated by the speaker 5 satisfactorily.

In this case, among the plurality of first reinforcing ribs 25, the plurality of first reinforcing ribs 25 corresponding to the second sound emitting portion 24 extend from the inner surface of the upper surface of the upper case 2 to the lower portion of the front surface portion 23 of the upper case 2. , the sound emitting holes 24a of the second sound emitting portion 24 are provided vertically across the plurality of sound emitting holes 24a. Even in this case, the plurality of first reinforcing ribs 25 can reliably and firmly reinforce the second sound emitting portion 24 .

In this keyboard instrument, the length S4 of the keys 7 in the arrangement direction is longer than the length S3 (width) of the keys 7 in the front-rear direction behind the plurality of first reinforcing ribs 25 on the inner surface of the upper surface of the upper case 2. Since the long frame-shaped second reinforcing ribs 26 are provided along the arrangement direction of the plurality of first reinforcing ribs 25, the upper case 2 can be reinforced by the frame-shaped second reinforcing ribs 26 as well. Therefore, the thickness of the upper case 2 can be reduced, and even if the thickness of the upper case 2 is reduced, the strength of the upper case 2 can be sufficiently secured.

That is, the frame-shaped second reinforcing rib 26 has a pair of long side portions 26a parallel to the front surface portion 23 of the upper case 2 and long in the arrangement direction of the keys 7, and equidistantly spaced between the pair of long side portions 26a. and a short side portion 26b having a length S3 in the front-rear direction of the key 7 that is shorter than the long side portion 26a. Since the upper surface of the upper case 2 can be reliably and firmly reinforced by the 2-reinforcing ribs 26, the upper case 2 can be prevented from bending even if the thickness of the upper case 2 is reduced.

In this case, the frame-shaped second reinforcing rib 26 is formed by connecting the plurality of first reinforcing ribs 25 to each other. 2 and the front part 23 can be reinforced more reliably and firmly, so that even if the thickness of each of the upper case 2 and the front part 23 is reduced, the upper case 2 and the front part 23 will not be bent or Twisting can be reliably and firmly prevented.

As a result, in this keyboard instrument, the upper case 2 and the front portion 23 are sufficiently reinforced by the plurality of first reinforcing ribs 25 and the frame-like second reinforcing ribs 26, so that the upper case 2 and the front portion 23 are By reducing the thickness of each part, the material cost of the upper case 2 can be reduced and the cost can be reduced, and the weight of the upper case 2 can be reduced to reduce the weight of the musical instrument case. 1 can be easily carried.

In this keyboard instrument, a frame-shaped second reinforcing rib 26 elongated along the direction in which the keys 7 are arranged is provided on the keyboard chassis 6 to support the rear portions of the keys 7 in a rotatable manner. 12, when the musical instrument case 1 is assembled by stacking the upper case 2 on the lower case 3, the frame-shaped second reinforcing rib is supported by the key supporting portion 12 of the keyboard chassis 6. As a result, the upper case 2 can be reinforced, and the entire musical instrument case 1 can be reinforced.

In this case, the plurality of key support portions 12 provided on the keyboard chassis 6 protrude upward from the rear portions of the plurality of keys 7, so that frame-shaped second reinforcing ribs 26 are arranged at the upper ends of the respective keys. However, the rotation of the plurality of keys 7 is not hindered by the second reinforcing ribs 26, so that the plurality of keys 7 can be satisfactorily depressed.

Further, in this keyboard instrument, a sound escape portion 27 in which the second reinforcing ribs 26 do not exist in a partial region of the second reinforcing ribs 26 corresponding to the second sound emitting portion 24 provided with a plurality of sound emitting holes 24a. is provided, even if the sound generated by the speaker 5 is blocked by the second reinforcing rib 26, the sound generated by the speaker 5 passes through the sound escape portion 27 provided on the second reinforcing rib 26. The sound emission part 27 improves the sound emission, and the sound of the speaker 5 can be favorably emitted from the plurality of sound emission holes 24 a of the second sound emission part 24 .

In this case, the sound escape portion 27 is provided in a region located on the central side of the front surface portion 23 of the upper case 2 in the region corresponding to the second sound emitting portion 24, so that the sound generated by the speaker 5 is passes through the sound escape part 27 and is emitted to the front side of the upper case 2, the sound generated by the speaker 5 can be reliably and favorably emitted toward the performer.

Further, when the length of the sound escape portion 27 in the left-right direction is long, a frame-shaped auxiliary reinforcing rib 27a having a short length in the left-right direction is provided in the intermediate portion of the sound escape portion 27, thereby reducing the length of the second reinforcing rib. A decrease in the strength of the upper case 2 due to 26 can be prevented by the auxiliary reinforcing ribs 27a. In this case also, when the upper case 2 is placed on top of the lower case 3, the auxiliary reinforcing rib 27a is supported by the key support portion 12 of the keyboard chassis 6, like the second reinforcing rib 26. , the strength of the upper case 2 at the portion corresponding to the sound escape portion 27 can be ensured.

Further, in this keyboard instrument, since the plurality of first reinforcing ribs 25 are provided corresponding to the black keys 11 of the plurality of keys 7, when the musical instrument case 1 is viewed from the front, the second sound emitting portion Even if the plurality of sound emitting holes 24a of 24 are visible from between the black keys 11, the plurality of first reinforcing ribs 25 can be hidden by the plurality of black keys 11, so that the appearance of the entire musical instrument case 1 can be improved. Designability can be improved.

That is, in this keyboard instrument, since the second sound emitting portion 24 and the black keys 11 are substantially at the same height, when the musical instrument case 1 is viewed from the front, the plurality of black keys 11 provide a plurality of first reinforcements. The rib 25 can be reliably hidden. In this case, since the front side of the black key 11 is at the same height as the second sound emitting portion 24 and is inclined so as to gradually decrease toward the rear side, the musical instrument case 1 is viewed from the front. In this case, the plurality of first reinforcing ribs 25 can be reliably hidden by the front side of the tall black key 11 .

Furthermore, in this keyboard instrument, felt 28 is stretched horizontally under the plurality of first reinforcing ribs 25, so that the plurality of keys 7 come into direct contact with the lower end of the front surface 23 of the upper case 2. In addition to preventing contact and buffering, it is possible to reduce foreign matter such as dust entering the musical instrument case 1 from the plurality of sound emitting holes 24 a of the second sound emitting portion 24 .

In this case, each of the plurality of first reinforcing ribs 25 is provided with a position restricting portion 25a that restricts the position of the felt 28 in the front-rear direction. Since the front and rear positions of the felt 28 can be regulated, the front end of the felt 28 can be accurately and favorably aligned with the front portion 23 of the upper case 2, thereby improving the appearance and design. .

In the above-described embodiment, the case where the felt 28 is stretched between the lower end of the front surface portion 23 of the upper case 2 and the lower ends of the plurality of first reinforcing ribs 25 has been described, but the present invention is not limited to this. Alternatively, a structure in which a sound emitting net is stretched between the lower end portion of the front surface portion 23 of the upper case 2 and the lower end portions of the plurality of first reinforcing ribs 25 may be used.

Although one embodiment of the present invention has been described above, the present invention is not limited to this, and includes the invention described in the claims and the scope of equivalents thereof.
The invention described in the claims of the present application will be additionally described below.

(Appendix)
The invention according to claim 1 is characterized by a keyboard having a plurality of keys, a front portion provided with a sound emitting hole for emitting the sound of the speaker forward on the rear end side of the plurality of keys, and a case having at least one first reinforcing rib provided corresponding to the sound emission hole inside the front surface, wherein the at least one first reinforcing rib is provided for the plurality of keys. It is a keyboard instrument in which the length of the keys in the front-rear direction is longer than the length in the arrangement direction of the keys.

The invention according to claim 2 is the keyboard instrument according to claim 1, wherein the case is arranged behind the at least one first reinforcing rib so as to extend in the direction of arrangement of the plurality of keys from the length of the keys in the front-rear direction. A keyboard instrument comprising a frame-shaped second reinforcing rib having a long length, wherein the at least one first reinforcing rib and the second reinforcing rib are connected.

The invention according to claim 3 is the keyboard instrument according to claim 2, wherein the second reinforcing rib is a key supporting portion provided on the keyboard side for rotatably supporting the plurality of keys. It is a keyboard instrument provided corresponding to

The invention according to claim 4 is the keyboard instrument according to claim 2 or claim 3, wherein a plurality of the second reinforcing ribs are provided along the arrangement direction of the plurality of keys, The rib is a keyboard instrument that is not provided in a part of the area corresponding to the sound emission hole.

The invention according to claim 5 is the keyboard instrument according to claim 4, wherein the partial region is included in a region located on the center side of the case, in the region corresponding to the sound emission hole. It is a keyboard instrument.

The invention according to claim 6 is the keyboard instrument according to any one of claims 1 to 5, wherein the at least one first reinforcing rib is provided corresponding to a black key. be.

The invention according to claim 7 is the keyboard instrument according to any one of claims 1 to 6, wherein the at least one first reinforcing rib extends from the inner surface side of the upper surface of the case to the lower part of the front surface. It is a keyboard instrument that stretches across.

The invention according to claim 8 is the keyboard instrument according to any one of claims 1 to 7, wherein a plurality of the sound emitting holes are arranged in the vertical direction on the front surface. .

The invention according to claim 9 is the keyboard instrument according to any one of claims 1 to 8, wherein the lower part of the at least one first reinforcing rib is made of at least one of felt and a sound emitting member. A keyboard instrument provided with a position regulating portion that regulates the position.

1 musical instrument case 2 upper case 3 lower case 4 keyboard part 5 speaker 6 keyboard chassis 7 key 8 hammer member 9 switch part 10 white key 11 black key 12 key support part 23 front part 24 second sound emitting part 24a sound emitting hole 25 second 1 reinforcing rib 25a position restricting portion 26 second reinforcing rib 26a long side portion 26b short side portion 27 sound escape portion 27a auxiliary reinforcing rib 28 felt

Claims (8)

a keyboard having a plurality of keys;
The keyboard is housed so that the operating surfaces of the plurality of keys are exposed, and sound is emitted from a speaker forward at a position higher than the operating surface on the rear end side of the plurality of keys. a case having a front face provided with a hole;
with
The case has a first reinforcing rib that is connected to the front portion and extends rearward of the front portion, and a second reinforcing rib that is connected to the first reinforcing rib and extends in the direction in which the plurality of keys are arranged. , keyboard instrument. 2. The second reinforcing rib is a frame-shaped rib that is connected to the rear end of the first reinforcing rib and has a length in the direction in which the plurality of keys are arranged that is longer than the length in the front-rear direction of the key. The keyboard instrument described in . The case has a plurality of first reinforcing ribs respectively connected to different positions in the arrangement direction of the plurality of keys on the front surface,
3. The keyboard instrument according to claim 1, wherein said second reinforcing ribs are connected to said plurality of first reinforcing ribs at different positions in the arrangement direction of said plurality of keys. a keyboard having a plurality of keys including white keys and black keys;
The keyboard is housed so that the operating surfaces of the plurality of keys are exposed, and sound is emitted from a speaker forward at a position higher than the operating surface on the rear end side of the plurality of keys. a case having a front face provided with a hole;
with
The case has a first reinforcing rib connected to the front surface portion and extending rearward of the front surface portion,
A keyboard instrument, wherein a plurality of the first reinforcing ribs are provided at positions corresponding to the plurality of black keys. a keyboard having a plurality of keys;
The keyboard is housed so that the operating surfaces of the plurality of keys are exposed, and sound is emitted from a speaker forward at a position higher than the operating surface on the rear end side of the plurality of keys. a case having a front face provided with a hole;
with
The case has a first reinforcing rib connected to the front surface portion and extending rearward of the front surface portion,
A keyboard instrument, wherein a position regulating portion for regulating the position of the felt is provided below the first reinforcing rib. 4. The keyboard instrument according to claim 1, wherein said case is provided with a plurality of said second reinforcing ribs at different positions in the arrangement direction of said plurality of keys. 4. The case according to any one of claims 1 to 3, wherein the case has a plurality of the first reinforcing ribs connected to the second reinforcing ribs and a plurality of the first reinforcing ribs not connected to the second reinforcing ribs. A keyboard instrument as described. 8. The keyboard instrument according to any one of claims 1 to 7, wherein said case has a rear sound emitting portion provided with a sound emitting hole for emitting sound of said speaker backward.

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