JP2020064147A - Keyboard musical instrument - Google Patents

Abstract

To provide a keyboard musical instrument capable of securing sufficient strength even if thickness of a case is thinned.SOLUTION: A keyboard musical instrument comprises: a keyboard part 4 having a plurality of keys 7; and a musical instrument case 1 having a front part where sound radiation holes 24a for radiating sound of a speaker 5 forward are arranged at a rear end side of the plurality of keys 7 and at least one first reinforcing rib 25 arranged correspondingly to the sound radiation holes 24a on an inner side of the front part. The at least one first reinforcing rib 25 has length in a back-and-forth direction of the keys 7 longer than length in an arranging direction of the plurality of keys 7. Since a plurality of first reinforcing ribs 25 can reinforce an upper case 2 and a second sound radiation part 24, strength of the upper case 2 and the second sound radiation part 24 can sufficiently be secured even if thickness of the upper case 2 is thinned.SELECTED DRAWING: Figure 5

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 emission holes that are long in the left-right direction are provided on the front surface of the rear upper side of the plurality of keys in a musical instrument case including a plurality of keys and a speaker. There is known a structure in which a sound emitting portion provided is provided and the sound of the speaker is emitted from the sound emitting portion toward the front of the musical instrument case.

JP, 2014-212618, A

  In such a keyboard instrument, since the sound emission holes of the sound emission section are long in the direction in which the keys are arranged and are arranged in the vertical direction, a plurality of partition ribs are provided in the sound emission holes. The sound emitting portion is reinforced by being provided at a predetermined interval.

  However, since such a keyboard instrument has a structure in which a plurality of partition ribs are provided in a plurality of sound output holes, the sound output section is sufficiently secured unless the instrument case is made thick. There is a problem that you can not.

  The problem to be solved by the present invention is to provide a keyboard instrument capable of ensuring sufficient strength even when the thickness of the case is thin.

  One aspect of the present invention is a keyboard having a plurality of keys, a front surface portion provided with a sound emission hole for emitting a sound of a speaker to the front at a rear end side of the plurality of keys, and the front surface. A case having at least one first reinforcing rib provided corresponding to the sound output hole inside the portion, and the at least one first reinforcing rib in the arrangement direction of the plurality of keys. It is a keyboard instrument whose key length is longer than its length.

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

It is a perspective view showing one embodiment of a keyboard instrument to which this invention was applied. It is a front view of the keyboard musical instrument shown in FIG. It is a rear view of the keyboard musical instrument shown in FIG. FIG. 3 is an enlarged front view showing a part of the keyboard musical instrument shown in FIG. 2. FIG. 3 is an enlarged cross-sectional view of the keyboard musical instrument shown in FIG. 2, taken along the line AA. FIG. 3 is an enlarged cross-sectional view showing a main part of the keyboard musical instrument shown in FIG. FIG. 2 is a perspective view showing an inner side of an upper case of the keyboard musical instrument shown in FIG. 1. FIG. 8 is a perspective view showing the upper case shown in FIG. 7. FIG. 9 is an enlarged front view of a main part of the upper case shown in FIG. 8 viewed 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 inner view showing a main part of the upper case shown in FIG. 11. It is an expanded sectional view of the upper case shown in FIG. It is an expanded sectional view in the DD arrow of the upper case shown in FIG.

An embodiment of a keyboard instrument to which the present invention is applied will be described below with reference to FIGS. 1 to 14.
As shown in FIGS. 1 to 3, this keyboard instrument includes a horizontally long instrument case 1 which is long in the left-right direction. The musical instrument case 1 includes 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 extending over substantially half or more of the front side and the upper portion of the front side, except for the rear side and both side portions on the upper surface. It is formed in a horizontally long, almost box-like shape with its side open. The lower case 3 is formed in a horizontally long box shape opened to the upper side. As a result, the musical instrument case 1 has a structure in which the lower outer circumference of the upper case 2 is arranged and joined to the upper outer circumference of the lower case 3. In this case, a volume switch SW1 and a plurality of push button switches SW2 are provided on the upper surface of the upper case 2.

  Further, inside the musical instrument case 1, as shown in FIGS. 1 to 7, a keyboard portion 4 and a plurality of speakers 5 are provided. As shown in FIG. 5, the keyboard portion 4 has 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 is provided with a plurality of hammer members 8 to be provided and a plurality of switch portions 9 each of which performs a switch operation in response to a key depression operation of a plurality of keys 7.

  The plurality of keys 7 include a plurality of white keys 10 and a plurality of black keys 11, as shown in FIGS. As shown in FIG. 5, a rear portion of each of the plurality of white keys 10 is rotatably attached to a key support portion 12 provided on a rear end portion of the keyboard chassis 6, and a front end portion thereof is attached to a front end portion of the keyboard chassis 6. The white key guide portions 13a of the keyboard chassis 6 are arranged and guided vertically.

  As shown in FIGS. 1, 2, and 4 to 6, each of the plurality of black keys 11 is formed such that the length in the front-rear direction is shorter than the length in the front-rear direction of the white key 10, and the height thereof excludes the rear portion. And is formed higher than the white key 10. That is, as shown in FIG. 5, the rear portions of the plurality of black keys 11 are at the same height as the rear portions of the plurality of white keys 10.

  As shown in FIG. 5, each of the plurality of black keys 11 has a rear portion rotatably attached to the key support portion 12 of the keyboard chassis 6 and a front portion of the black key 11 of the keyboard chassis 6, as with 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 so that its height is slightly higher than the rear portions of the white key 10 and the black key 11.

  As a result, when the plurality of keys 7 are arranged in the musical instrument case 1 as shown in FIG. 5, the rear part of each key 7 is arranged below the rear part of the upper case 2. The upper case 2 is exposed to the upper side in correspondence with the opening 2a. In this case, each of the plurality of black keys 11 is inclined so that the front side is high and the black keys 11 are gradually lowered toward the rear side. The height of the front side of each of the plurality of black keys 11 is equal to or slightly lower than the upper surface of the upper case 2.

  As shown in FIG. 5, 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, and the shaft portion 17 is rotatable with respect to the hammer support portion 14 of the keyboard chassis 6. Is attached to. In this case, the plurality of hammer members 8 include a hammer member 8a for a white key and a hammer member 8b for a black key. 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 attached to the hammer support portion 14 of the keyboard chassis 6 by the weight of the weight portion 16 so that the hammer body 15 is attached. Then, the lower end of the weight portion 16 contacts the lower limit stopper 20, and in this state, the key interlocking portion 18 pushes up the key 7 to regulate the position to the initial position.

  Further, as shown in FIG. 5, each of the plurality of hammer members 8 is operated by pressing the key 7, and the key interlocked portion 18 is pressed down against the weight of the weight portion 16 by the operated key 7. When the hammer body 15 is rotated, the hammer body 15 rotates clockwise around the shaft portion 17 attached to the hammer support portion 14 of the keyboard chassis 6 to apply an action load to the key 7 so that the upper end portion of the weight portion 16 becomes the upper limit. The stopper 21 is brought into contact with the stopper 21.

  As shown in FIG. 5, each of the plurality of switch parts 9 includes a switch board 9a provided on the keyboard chassis 6 and a bulging rubber 9b provided on the switch board 9a and corresponding to each key 7. I have it. In the plurality of switch portions 9, when the key 7 is depressed, the pressing portion 7a of the key 7 elastically deforms the bulging rubber 9b so that the movable contact in the bulging rubber 9b is located on the switch substrate 9a. A switch signal is output by contacting a fixed contact (neither is shown).

  By the way, as shown in FIG. 5 to FIG. 7, the plurality of speakers 5 are provided on both sides of the upper case 2 in the left-right direction toward the rear side of the upper case 2, respectively. That is, the plurality of speakers 5 are attached to the left and right rear surfaces inside the upper case 2, respectively. Thereby, each of the plurality of speakers 5 is arranged between the rear part of the keyboard chassis 6 of the keyboard part 4 and the rear surface of the upper case 2 toward the rear surface side of the upper case 2.

  In this case, as shown in FIGS. 3, 5 and 6, a first sound emitting portion 22 for emitting the musical sound generated by the speaker 5 is provided on the rear surface on the left and right sides of the upper case 2 with a plurality of speakers. 5 are provided corresponding to each. Each of the first sound emitting portions 22 is provided with a large number of holes. As a result, the first sound emitting unit 22 emits the musical sound generated by the speaker 5 from the back surface of the musical instrument case 1 toward the rear.

  Further, as shown in FIGS. 1, 4, 9, and 10, the front portion 23 has a plurality of front portions 23 at the front end portion in the upper portion of the upper case 2, that is, the edge portion on the rear side of the open portion 2a of the upper case 2. It is provided corresponding to the upper side of each rear part of the key 7. Second sound emitting portions 24 are provided on both left and right sides of the front surface portion 23. The second sound emitting portion 24 has slit-shaped sound emitting holes 24a that are long in the left-right direction and are arranged in two upper and lower stages.

  In this case, the second sound emitting unit 24 is provided longer than the length of the first sound emitting unit 22 in the left-right direction, as shown in FIGS. 1, 2, 4, and 6 to 9. That is, the second sound emitting portion 24 is provided with a length that is about twice the length of the speaker 5 in the left-right direction from the location corresponding to the speaker 5 toward the center side of the front surface portion 23 of the upper case 2. There is. On the inner surface of the front surface portion 23 of the upper case 2 provided with the second sound emitting portions 24, as shown in FIGS. 5 to 10, a plurality of first reinforcing ribs 25 are arranged along the arrangement direction of the plurality of keys 7. 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 key 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 in the vertical direction across the plurality of sound emission 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. , Extends toward the back surface of the upper case 2.

  In this case, the lower end portions of the plurality of first reinforcing ribs 25 are arranged at the same height and on the same plane as the lower end surface of the front surface portion 23 of the upper case 2, as shown in FIGS. 11 to 14. . Thus, the plurality of first reinforcing ribs 25 firmly reinforce the upper surface portion and the front surface portion 23 of the upper case 2 even if the upper surface portion and the front surface portion 23 of the upper case 2 are formed to be thin. Has become.

  In this case, among the plurality of first reinforcing ribs 25, the plurality of first reinforcing ribs 25 corresponding to the second sound emitting portions 24 are the meat of the front surface portion 23 of the upper case 2 as shown in FIGS. 11 to 14. Even if the second sound emitting portion 24 is formed to be thin and has a plurality of slit-shaped sound emitting holes 24a, it extends 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. The second sound emitting portion 24 is strongly reinforced by being provided so as to cross 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 have a plurality of black keys of the keyboard portion 4 as shown in FIGS. 4 to 6. 11 are provided corresponding to each. Thereby, in the plurality of first reinforcing ribs 25 corresponding to the second sound emitting portions 24, the second sound emitting portions 24 of the front surface portion 23 of the upper case 2 are arranged above the respective rear portions of the plurality of keys 7. Also, when the keyboard 4 is viewed from the front, it is hidden by the plurality of black keys 11 so as not to be seen from the front.

  Further, 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, as shown in FIGS. 11 to 14, a long frame-like shape is arranged along the arrangement direction of the plurality of first reinforcing ribs 25. Second reinforcing ribs 26 are provided. The 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 at a predetermined interval between the pair of long side portions 26a. By these, the whole is formed in an elongated frame shape.

  That is, as shown in FIGS. 11 to 14, the second reinforcing rib 26 has a horizontally long frame shape in which the length S3 (width) of the keys 7 in the front-rear direction is shorter than the length S4 of the keys 7 in the arrangement direction. It is 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 the second reinforcing ribs 26 further strongly reinforce the upper surface of the upper case 2 and the front surface portion 23, and bend the upper case 2 and the front surface portion 23. It is designed to prevent twisting.

  In this case, the second reinforcing ribs 26 are provided on the keyboard chassis 6 so that the plurality of keys 7 can be rotated when the upper case 2 overlaps the lower case 3, as shown in FIGS. 5 and 6. It is provided so as to correspond to the plurality of key support portions 12 that support it. As a result, the second reinforcing ribs 26 are arranged and supported on the upper ends of the plurality of key supporting portions 12 provided on the keyboard chassis 6. That is, since the plurality of key supporting portions 12 provided on the keyboard chassis 6 protrude above the respective rear portions of the plurality of keys 7, even if the second reinforcing ribs 26 are arranged at the respective upper end portions, It does not hinder the rotation operation of the key 7.

  Further, as shown in FIGS. 11 to 14, the second reinforcing rib 26 is positioned closer to the middle portion in the left-right direction in the front surface portion 23 of the upper case 2 than the speaker 5 in the second sound emitting portion 24. In a part of the area corresponding to the second sound emitting portion 24, the sound escape portion 27 where the second reinforcing rib 26 does not exist is provided. The sound dropout portion 27 is a portion where the second reinforcing rib 26 is not provided, and the sound generated by the speaker 5 is prevented from being blocked by the second reinforcement rib 26, thereby improving the sound dropout. .

  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 at an intermediate portion of the sound output portion 27. The auxiliary reinforcing ribs 27 a 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, and the upper case 2 overlaps the lower case 3. When arranged, like the second reinforcing rib 26, it is supported by the key supporting portion 12 of the keyboard chassis 6.

  Further, as shown in FIG. 5, a belt-shaped felt 28 is provided on the lower end of the front surface portion 23 of the upper case 2 and each lower end portion of the plurality of first reinforcing ribs 25 over the entire length of the front surface portion 23 of the upper case 2. It is pasted across. In this case, each of the lower ends of the plurality of first reinforcing ribs 25 is provided with a position restricting portion 25a that restricts the front-rear position of the felt 28, as shown in FIGS. As a result, the front and rear positions of the felt 28 are restricted by the position restricting portions 25 a of the first reinforcing ribs 25, so that the front end of the felt 28 is aligned with the front surface portion 23 of the upper case 2.

Next, the operation of such a keyboard instrument will be described.
When playing with this keyboard instrument, a plurality of keys 7 may be depressed. That is, when a plurality of keys 7 are depressed, the depressed keys 7 push down the key interlocking portion 18 of the hammer member 8 to rotate the hammer body 15 around the shaft portion 17 of the hammer member 8. An action load is applied to the key 7 that is pressed in accordance with the rotation operation of the member 8.

  At this time, since the pressing portion 7a of the depressed key 7 presses the bulging rubber 9b of the switch portion 9 to elastically deform it, the movable contact inside the bulging rubber 9b comes into contact with the fixed contact of the switch substrate 9a. Output a switch signal. Then, a sounding unit (not shown) generates musical sound data based on the switch signal of the switch 9 and causes the plurality of speakers 5 to generate musical sounds.

  At this time, the musical sound generated by the plurality of speakers 5 is emitted from the first sound emitting portion 22 provided on the back surface of the upper case 2 toward the rear of the musical instrument case 1, that is, toward the audience side. Further, at this time, the low tone of the musical tones generated by the plurality of speakers 5 is emitted from the plurality of sound emitting holes 24a of the second sound emitting portion 24 provided in the front surface portion 23 of the upper case 2 to the musical instrument case 1. The sound is emitted toward the front side, that is, the player side.

  As described above, when the sound of the speaker 5 is emitted from the plurality of sound emission holes 24 a of the second sound emission unit 24 provided in the front surface portion 23 of the upper case 2, the plurality of sound emission units 24 of the second sound emission unit 24 are emitted. Even if the sound hole 24a is formed in the front surface portion 23 of the upper case 2 in the shape of a slit in the left-right direction, the second sound emitting portion 24 is reinforced by the first reinforcing ribs 25. It is possible to prevent the generation of abnormal noise due to 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 dropout portion 27, even if a part of the musical sound generated by the speaker 5 is blocked by the second reinforcing rib 26, the speaker 5 does not. Another part of the generated musical sound is emitted from the plurality of sound emitting holes 24a of the second sound emitting portion 24 through the sound dropout portion 27, so that the musical sound generated by the speaker 5 is also emitted from the front side of the musical instrument case 1. Good sound is emitted toward the performer.

  By the way, on the inner surface of the front surface portion 23 of the upper case 2 of the musical instrument case 1, the first reinforcing ribs 25 are 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. The upper surface and the front surface 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, since the frame-shaped second reinforcing ribs 26 are provided on the inner surface of the upper surface of the upper case 2 along the arrangement direction of the plurality of first reinforcing ribs 25, the upper surface of the upper case 2 is reinforced. There is. Therefore, also by this, 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 a short side portion 26b provided at a predetermined interval between the pair of long side portions 26a. And the upper part of the upper case 2 is strongly reinforced by the frame-shaped second reinforcing ribs 26. Therefore, even if the thickness of the upper surface of the upper case 2 is reduced, the upper surface of the upper case 2 can be prevented from bending.

  In this case, since the plurality of first reinforcing ribs 25 are connected to the frame-shaped second reinforcing ribs 26, the entire upper case 2 is covered by the plurality of first reinforcing ribs 25 and the frame-shaped second reinforcing ribs 26. The strength of is further increased. Therefore, even if the thicknesses of the upper surface portion and the front surface portion 23 of the upper case 2 are reduced, the bending and twisting of the entire upper case 2 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 in the lower case 3 when the upper case 2 is arranged so as to overlap with the lower case 3. By doing so, the strength of the upper case 2 as well as the strength of the entire musical instrument case 1 are also secured by this.

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

  In addition, since the strength of the upper case 2 is ensured in this musical instrument case 1 because the upper case 2 is not provided with a sound emitting portion, damage to the musical instrument case 1 can be prevented and the inside of the musical instrument case 1 can be prevented. Dust ingress into the interior is reduced and the appearance is refreshed, improving the design.

  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 include the plurality of keys 7 having the same height as the upper surface of the upper case 2 among the plurality of keys 7. Since the plurality of sound emitting holes 24a of the second sound emitting portion 24 are seen from between the black keys 11 when the musical instrument case 1 is viewed from the front, the plurality of sound emitting holes 24a are provided corresponding to the black keys 11. 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 refreshed and the design is improved.

  Further, belt-like felts 28 are attached to the lower end of the front surface portion 23 of the upper case 2 and the lower end portions of the plurality of first reinforcing ribs 25 over the entire length of the front surface portion 23 of the upper case 2. Therefore, the plurality of keys 7 are prevented from directly contacting the lower end portion of the front surface portion 23 of the upper case 2 and are buffered, and foreign matter such as dust that has entered through the plurality of sound emitting holes 24a of the second sound emitting portion 24 is prevented. Intrusion into the musical instrument case 1 is reduced.

  In this case, the plurality of first reinforcing ribs 25 are respectively provided with the position restricting portions 25a that restrict the position of the felt 28 in the front-rear direction, so that the felt 28 is moved by the position restricting portions 25a of the first reinforcing ribs 25. Since 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, this also improves the appearance and design.

  As described above, according to this keyboard instrument, the keyboard portion 4 having the plurality of keys 7 and the sound emitting hole 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 surface portion 23 corresponding to the sound output hole 24a. The 1st reinforcing rib 25 secures sufficient strength even if the wall thickness of the upper case 2 is reduced because the length S1 in the front-back direction of the keys 7 is longer than the length S2 in the arrangement direction of the plurality of keys 7. be able to.

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

  Further, in this keyboard instrument, the second sound emitting section 24 has a plurality of sound emitting holes 24a, which are long in the arrangement direction of the keys 7 for emitting the sound of the peaker 5 forward of the upper case 2, on the front surface of the upper case 2. The sound generated by the peaker 5 is satisfactorily emitted to the front side of the upper case 2 through the plurality of sound emission holes 24a provided in the front surface portion 23 of the upper case 2 by arranging the portions 23 in the vertical direction. Therefore, the player can satisfactorily listen to the sound generated by the peaker 5.

  In this case, among the plurality of first reinforcing ribs 25, the plurality of first reinforcing ribs 25 corresponding to the second sound emitting portions 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. Since the plurality of sound emission holes 24a of the second sound emission portion 24 are provided across the plurality of sound emission holes 24a of the second sound emission unit 24 in the vertical direction, the plurality of sound emission holes 24a are formed in a slit shape that is long in the left and right direction. Even if it is provided, the second sound emitting portion 24 can be reliably and firmly reinforced by the plurality of first reinforcing ribs 25.

  Further, in this keyboard instrument, the length S4 of the keys 7 in the arrangement direction is more 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 also by the frame-shaped second reinforcing ribs 26. 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 ensured.

  That is, the frame-shaped second reinforcing ribs 26 have a pair of long side portions 26 a that are parallel to the front surface portion 23 of the upper case 2 and are long in the arrangement direction of the keys 7, and are equally spaced between the pair of long side portions 26 a. And a short side portion 26b of which the length S3 of the key 7 in the front-rear direction is shorter than the long side portion 26a, and the whole is formed in an elongated frame shape. Since the upper surface of the upper case 2 can be reliably and strongly reinforced by the two reinforcing ribs 26, even if the thickness of the upper case 2 is reduced, the upper case 2 can be prevented from bending.

  In this case, since the plurality of first reinforcing ribs 25 are connected to each other, the frame-shaped second reinforcing ribs 26 are connected by the plurality of first reinforcing ribs 25 and the frame-shaped second reinforcing ribs 26. 2 and the front surface portion 23 can be reinforced more reliably and firmly, so that even if the thicknesses of the upper case 2 and the front surface portion 23 are reduced, the bending of the upper case 2 and the front surface portion 23 can be prevented. Twist 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-shaped second reinforcing ribs 26. By reducing the wall thickness, 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. 1 can be easily carried.

  Further, in this keyboard instrument, a frame-shaped second reinforcing rib 26 that is long in the arrangement direction of the plurality of keys 7 is provided on the keyboard chassis 6 and rotatably supports the rear portions of the plurality of keys 7. Since it is provided corresponding to 12, when the upper case 2 is placed on the lower case 3 to assemble the musical instrument case 1, the key supporting portion 12 of the keyboard chassis 6 supports the frame-shaped second reinforcing ribs. Therefore, the upper case 2 can be reinforced also by this, and the entire instrument case 1 can be reinforced.

  In this case, the plurality of key supporting portions 12 provided on the keyboard chassis 6 protrude above the respective rear portions of the plurality of keys 7, so that the frame-shaped second reinforcing ribs 26 are arranged at the respective upper end portions. However, since the second reinforcing ribs 26 do not hinder the rotation operation of the plurality of keys 7, the plurality of keys 7 can be favorably pressed.

  In addition, in this keyboard instrument, the sound escape portion 27 in which the second reinforcing rib 26 does not exist in a part of the second reinforcing rib 26 corresponding to the second sound emitting portion 24 provided with the plurality of sound emitting holes 24a. Since the sound generated by the speaker 5 is blocked by the second reinforcing ribs 26, the sound generated by the speaker 5 can pass through the sound dropout portion 27 provided on the second reinforcing ribs 26. The sound output section 27 can improve the sound output, and the sound of the speaker 5 can be satisfactorily output from the plurality of sound output holes 24 a of the second sound output section 24.

  In this case, the sound dropout portion 27 is provided in a region located on the center 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 generated. Is emitted to the front side of the upper case 2 through the sound passage portion 27, so that the sound generated by the speaker 5 can be reliably and satisfactorily emitted toward the player.

  Further, when the length of the sound escape portion 27 in the left-right direction is long, a second frame-shaped auxiliary reinforcement rib 27a having a short length in the left-right direction is provided in the middle portion of the sound escape portion 27. The lowering of the strength of the upper case 2 due to 26 can be prevented by the auxiliary reinforcing rib 27a. Also in this case, the auxiliary reinforcing ribs 27a are supported by the key supporting portion 12 of the keyboard chassis 6 when the upper case 2 is placed on the lower case 3 in the same manner as the second reinforcing ribs 26. Therefore, the strength of the upper case 2 at the portion corresponding to the sound output portion 27 can be secured.

  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 instrument case 1 is viewed from the front side, the second sound emitting section is provided. Even if the plurality of sound output 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 refreshed. The designability can be improved.

  That is, in this keyboard instrument, since the second sound emitting portion 24 and the black key 11 have substantially the same height, when the instrument case 1 is viewed from the front, the plurality of first reinforcements are provided by the plurality of black keys 11. The rib 25 can be surely hidden. In this case, the black key 11 is formed such that the front side is at the same height as the second sound emitting section 24 and is inclined so as to be gradually lowered toward the rear side, so that the musical instrument case 1 is viewed from the front. At this time, the plurality of first reinforcing ribs 25 can be surely hidden by the front side of the high-height black key 11.

  Further, in this keyboard instrument, the felts 28 are horizontally stretched under the plurality of first reinforcing ribs 25, so that the plurality of keys 7 directly contact the lower end portion of the front surface portion 23 of the upper case 2. In addition to being able to prevent contact and buffering, it is possible to reduce foreign matter such as dust that has entered through the plurality of sound emitting holes 24a of the second sound emitting unit 24 from entering the musical instrument case 1.

  In this case, the plurality of first reinforcing ribs 25 are respectively provided with the position restricting portions 25a that restrict the position of the felt 28 in the front-rear direction, so that the felt 28 is moved by the position restricting portions 25a of the first reinforcing ribs 25. 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 surface portion 23 of the upper case 2, which also improves the appearance and design. .

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

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 an equivalent range thereof.
The inventions described in the claims of the present application will be additionally described below.

(Appendix)
The invention according to claim 1 is a keyboard having a plurality of keys, and a front surface portion provided on a rear end side of the plurality of keys with a sound emission hole for emitting a sound of a speaker forward, A case having at least one first reinforcing rib provided corresponding to the sound output hole inside the front surface portion, and the at least one first reinforcing rib includes 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.

  According to a second aspect of the present invention, in the keyboard musical instrument according to the first aspect, the case is arranged behind the at least one first reinforcing rib in a direction in which the plurality of keys are arranged from a longitudinal length of the keys. Is a keyboard instrument having a frame-shaped second reinforcing rib having a long length, and the at least one first reinforcing rib and the second reinforcing rib are connected to each other.

  According to a third aspect of the present invention, in the keyboard musical instrument according to the second aspect, the second reinforcing rib is provided on the keyboard side for rotatably supporting the plurality of keys. It is a keyboard instrument provided in correspondence with.

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

  According to a fifth aspect of the present invention, in the keyboard musical instrument according to the fourth aspect, the partial region is included in a region located on a center side of the case in a region corresponding to the sound output 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. is there.

  According to a seventh aspect of the invention, in the keyboard musical instrument according to any one of the first to sixth aspects, the at least one first reinforcing rib extends from an inner surface side of an upper surface of the case to a lower portion of the front surface portion. It is a keyboard instrument that extends all over.

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

  The invention according to claim 9 is the keyboard musical instrument according to any one of claims 1 to 8, wherein at least one of the felt and the sound emitting member is provided under the at least one first reinforcing rib. The keyboard musical instrument is provided with a position regulating section for regulating the position.

1 musical instrument case 2 upper case 3 lower case 4 keyboard section 5 speaker 6 keyboard chassis 7 key 8 hammer member 9 switch section 10 white key 11 black key 12 key support section 23 front section 24 second sound emitting section 24a sound emitting hole 25th 1 Reinforcement Rib 25a Position Control Part 26 Second Reinforcement Rib 26a Long Side 26b Short Side 27 Sound Escape 27a Auxiliary Reinforcement Rib 28 Felt

Claims (9)

A keyboard with multiple keys,
A front surface portion is provided on the rear end side of the plurality of keys for emitting the sound of the speaker forward, and a front surface portion is provided inside the front surface portion so as to correspond to the sound emission hole. A case having at least one first reinforcing rib,
Equipped with
The at least one first reinforcing rib is a keyboard instrument in which the length of the keys in the front-rear direction is longer than the length of the keys in the arrangement direction. 2. The keyboard musical instrument according to claim 1, wherein the case is a frame-shaped first rear portion of the at least one first reinforcing rib in which the length of the plurality of keys in the arrangement direction is longer than the length of the keys in the front-rear direction. With 2 reinforcing ribs,
A keyboard instrument in which the at least one first reinforcing rib and the second reinforcing rib are connected to each other.   The keyboard musical instrument according to claim 2, wherein the second reinforcing rib is provided corresponding to a key support portion provided on the keyboard side for rotatably supporting the plurality of keys. Keyboard instrument.   The keyboard instrument according to claim 2 or 3, wherein a plurality of the second reinforcing ribs are provided along an arrangement direction of the plurality of keys, and the second reinforcing ribs correspond to the sound output holes. A keyboard instrument that is not provided in a part of the area to be played.   The keyboard musical instrument according to claim 4, wherein the partial region is included in a region located on the center side of the case in a region corresponding to the sound output hole.   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.   The keyboard instrument according to any one of claims 1 to 6, wherein the at least one first reinforcing rib extends from an inner surface side of an upper surface of the case to a lower portion of the front surface portion.   The keyboard instrument according to any one of claims 1 to 7, wherein a plurality of the sound output holes are arranged in the vertical direction on the front surface portion.   In the keyboard musical instrument according to any one of claims 1 to 8, a position control part which controls a position of at least one of felt and a sound emitting member is under the at least one 1st reinforcement rib. A keyboard instrument provided.

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