JP4882416B2 - Resonance box for soundboard percussion instruments - Google Patents

Description

The present invention relates to co Nahako for tone plate percussion instrument.

  2. Description of the Related Art Conventionally, a resonance tube and a resonance box that are disposed and used in a sound board percussion instrument are known. For example, the resonance box applied to the sound board percussion instrument of Patent Document 1 below is different in type for each sound range, and a Helmholtz type, a closed tube type, and a collective type are adopted in order from the bass side. Each resonance chamber has an opening that opens to the sound plate side, and the opposite side of the sound plate is completely closed.

  Among these, the collective type has a single resonance chamber common to a plurality of sound plates. However, the Helmholtz type and the closed tube type have resonance chambers corresponding to a plurality of pitches, and each resonance chamber is unique so that the pitches (frequency) generated by the corresponding sound plates can be effectively resonated. It is comprised so that it may have the following resonance frequency.

For this reason, the closed tube type is configured so that the resonance chambers have different volumes by making the tube lengths different from each other, thereby making the resonance frequencies different from each other. Further, in the Helmholtz type, the resonance frequency can be adjusted by the opening area (port) of the opening (port) that opens to the sound board side, and therefore, in the sound board percussion instrument of the following Patent Document 1, the combination of the tube length and the opening area of the port is used. The resonance frequencies of the resonance chambers are different from each other.
Japanese Utility Model Publication No. 5-81895

  However, particularly in the closed tube type, the resonance frequency of each resonance chamber can be adjusted only by adjusting the volume of the resonance chamber. In addition, since it is necessary to make each resonance chamber correspond to the arrangement of the sound plates, the width of the resonance chambers in the direction in which the sound plates are arranged is limited, and as a result, the resonance frequency is adjusted only by changing the tube length. For this reason, the dimensions of each resonance chamber, particularly in the height direction, are determined, and there is a problem that the degree of freedom in design is low.

The present invention has been made in order to solve the above, the purpose is to enable adjusting the natural resonance frequency of co Nashitsu, tone plates percussion instrument it is possible to increase the freedom of design and to provide a co Nahako of use.

In order to achieve the above object, the resonance box for a soundboard percussion instrument according to claim 1 of the present invention is a resonance box (50) for a soundboard percussion instrument arranged in a soundboard percussion instrument having a plurality of soundboards. A resonance chamber (RM2, RM4) that is provided corresponding to each of the sound plates and resonates a musical tone of a specific pitch that is generated by the corresponding sound plate, and is connected to each of the resonance chambers, When a resonance box is disposed on the sound board percussion instrument, an opening (61) that opens to face the corresponding sound board, and when the resonance box is disposed on the sound board percussion instrument, the corresponding sound board And a lid member in which a through hole for each resonance chamber is formed, and each resonance chamber has at least one of a cross-sectional area and a depth of the through hole. The musical tone of the specific pitch that each corresponding sound board produces is resonated. And characterized in that it is.
To achieve the above object, a resonance box for a soundboard percussion instrument according to claim 4 of the present invention is a resonance box for a soundboard percussion instrument arranged in a soundboard percussion instrument having a plurality of soundboards, Resonance chambers provided corresponding to the respective sound plates for resonating musical tones with specific pitches generated by the corresponding sound plates, and connected to the respective resonance chambers, the resonance boxes being connected to the sound plate percussion instrument When disposed, the first opening that opens opposite to the corresponding sound board and the respective resonance chambers are provided, and when the resonance box is disposed in the sound board percussion instrument, A second opening opening on the opposite side of the sound plate, and each of the resonance chambers penetrates straight with a constant cross-sectional area from the inside of the resonance chamber to the outside of the second opening. the cross-sectional area of the regions, that are different from each other between the respective resonance chambers, be sounded are each corresponding tone plate Characterized in that it is configured to resonate tone of specific pitch.

Good Mashiku the shape and volume of the respective resonance chamber is common among a plurality of resonance chambers (claim 5).

  In addition, the code | symbol in the said parenthesis is an illustration.

According to the onset bright, with adjustable specific resonance frequency co Nashitsu, it is possible to increase the degree of freedom in designing the resonance box.

According to the fifth aspect , the resonance chamber can be shared among a plurality of pitches, and the types of parts constituting the resonance chamber can be reduced.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(First embodiment)
FIG. 1 is a cross-sectional view showing the internal configuration of the upper half of a keyboard instrument to which the resonance box according to the first embodiment of the present invention is applied. In brief, the keyboard instrument 10 is configured as a keyboard-type sound board percussion instrument, and is externally like an upright piano, but does not include strings. Instead, a sound board similar to the Celesta sound board is provided in the upper half 10a of the keyboard instrument 10, and the sound board is struck and vibrated to generate sound. It also has a box. Moreover, as a mechanism for hitting the sound board, a mechanism similar to an action mechanism for a grand piano is provided instead of an upright piano. Hereinafter, the player side of the keyboard instrument 10 is referred to as the front, and the left and right direction is referred to the player.

  As shown in FIG. 1, a gutter 15 is arranged on the shelf plate 14 at the lower part of the upper half 10 a, and a front gutter 16 is provided in the front part of the gutter 15. A support member 19 is provided on the heel 15, and a plurality of white keys 27 and black keys 28 of the keyboard KB swing in the vertical direction with the balance pins 62 and 63 provided on the support member 19 as fulcrums (seesaw motion). It is supported freely. A mouth bar portion 17 covers the front portion of the heel 16 over the entire key width.

  In addition, an action mechanism 20 is disposed in the upper part of the rear half of the basket 15 via an action bracket 22. The action bracket 22 and the action mechanism 20 are arranged corresponding to the keys 27 and 28, and the action mechanism 20 has the same configuration as the action mechanism of the grand piano. Further, above these action mechanisms 20, a sound source unit UNT including a wooden resonance box 50 and a plurality of sound plates 30 (sound plate group 30G) is disposed. The sound board 30 is provided corresponding to the keys 27 and 28. By pressing the corresponding keys 27 and 28, the hammer body 23 rotates upward, and the hammer felt 24 strikes the corresponding sound plate 30, so that the sound plate 30 vibrates and generates sound, and the sound is generated. Resonate in the resonance box 50. Below the action mechanism 20, the shelf plate 14 is provided with a sound emission hole 14 a.

  A damper pedal 12 is provided below the keyboard instrument 10. Further, above the rear ends of the keys 27, 28, a rotating member 64 is provided corresponding to each key 27, 28, and a damper felt 26 is provided on each rotating member 64 via a damper wire 25. Yes. A pedal connecting rod 13 is connected to the damper pedal 12. When the damper pedal 12 is stepped on, the entire damper felt 26 is lifted through the pedal connecting rod 13 and the entire damper wire 25. When the damper pedal 12 is not depressed, the damper felt 26 is in contact with the upper surface of the rear end portion of the corresponding sound plate 30. When the key is depressed, the damper felt 26 is separated from the sound plate 30 via the corresponding damper wire 25.

  FIG. 2 is a front view of the sound source unit UNT, and FIG. 3 is a plan view of the sound source unit UNT. As shown in FIG. 2, support portions 29 </ b> L and 29 </ b> R are fixed inside the side plates 18 </ b> L and 18 </ b> R constituting the left and right side portions of the keyboard instrument 10. The left and right ends of the resonance box 50 of the sound source unit UNT are screwed and fixed onto the support portions 29L and 29R with screws (not shown), so that the sound source unit UNT is accommodated in the upper half 10a.

  As shown in FIG. 3, the resonance box 50 includes a wooden front common wall 51 and a rear common wall 52 that extend over substantially the entire length in the key arrangement direction. The distance between the front common wall 51 and the rear common wall 52 increases toward the low frequency range, and has a “C” shape when viewed from the left.

  The sound board group 30G includes sound boards 30 corresponding to the number of keys. The sound plates 30 are arranged in parallel in the left-right direction, with the longitudinal direction being the front-rear direction. Each of the sound plates 30 is rectangular in cross section, but the shape such as the overall length is individually different, and the sound plate 30 is struck and vibrated by the corresponding hammer felt 24 to generate a sound with a specific pitch. Yes. The sound plates 30 are adjacent to each other and have adjacent specific pitches.

  At both ends in the longitudinal direction of each sound board 30, support holes (not shown) through which the connecting cords 44 (see FIG. 2) are passed are formed, and the front common wall 51 and the rear common wall 52 of the resonance box 50 are formed. A large number of fasteners 40 having locking portions for locking to the connecting straps 44 are attached to each lower surface. Each sound board 30 is attached to the resonance box 50 in a suspended state so as to be able to vibrate via a connecting string 44 and a number of fasteners 40.

  The resonance box 50 of the sound source unit UNT is composed of a bass part 50A, a middle tone part 50B, and a treble part 50C, which are different from each other in order from the bass side (see FIG. 2). The low sound region portion 50 </ b> A is a Helmholtz type and has the same number of resonance chambers RM <b> 1 as the sound plates 30 corresponding to the sound plates 30. The middle sound range portion 50B is a semi-closed tube type (the significance of the semi-closed tube type will be described later with reference to FIG. Further, the high sound region portion 50 </ b> C is a collective resonance box, and has one resonance chamber RM <b> 3 common to the plurality of sound plates 30.

  As shown in FIG. 3, in the resonance box 50, the front common wall 51 and the rear common wall 52 are connected by a plurality of partition plates 53 having different lengths. The partition plate 53 is a flat plate parallel to each other in the front-rear direction and the up-down direction, and is provided from the lower opening 61 to the upper end of each resonance chamber RM, as shown in FIG. The front and rear portions of the partition plate 53 are fixed to the front common wall 51 and the rear common wall 52 by adhesion or the like, respectively.

  As shown in FIG. 3, in the low sound region portion 50A and the middle sound region portion 50B, two sound plates 30 correspond to each other between the adjacent partition plates 53 in the key arrangement direction. In addition, the adjacent partition plates 53 are connected by diagonal plates 54 and 55, and between the adjacent partition plates 53, two resonance chambers RM 1 are formed by the diagonal plates 54, and two resonance chambers RM 2 are formed by the diagonal plate 55. Is done.

  As shown in FIG. 2, one lid member 56 common to the low frequency range portion 50 </ b> A is provided at the upper end of the partition plate 53 in the low frequency range portion 50 </ b> A and the upper ends of the step common portions inside the front common wall 51 and the rear common wall 52. The upper portions of all the resonance chambers RM1 are closed together by being fixed. In addition, one lid member 58 common to the high sound region portion 50C is fixed to the upper end of the step portion inside the front common wall 51 and the rear common wall 52 in the high sound region portion 50C, and the upper portion of the resonance chamber RM3 is closed. Has been.

  The mid-range part 50B is classified into five blocks depending on the height difference between the partition plate 53 and the resonance chamber RM2. In the mid-range part 50B, one lid member 57 for each block is fixed to the upper end of the partition plate 53 and the upper ends of the stepped parts inside the front common wall 51 and the rear common wall 52, respectively. The upper part of the chamber RM2 is substantially closed. However, a through hole 91 having a diameter corresponding to each resonance chamber RM2 is provided in the lid member 57 so as to be connected to each resonance chamber RM2 corresponding to each resonance chamber RM2. Not. Therefore, as described above, the mid-range part 50B is referred to as a “semi-closed tube type” instead of a closed tube type.

  Furthermore, the diagonal plates 54 and 55 are both flat plates along the vertical direction, and the diagonal plates 54 are parallel to each other, and the diagonal plates 55 are also parallel to each other. Since the structures and functions of the oblique plates 54 and 55 are basically the same, the structures of the oblique plate 55 and the resonance chamber RM2 of the mid-range part 50B will be mainly described.

  FIG. 4 is a partial horizontal sectional view of the mid-range 50B of the sound source unit UNT. Here, since the two resonance chambers RM2 will be described as a representative, the resonance chamber RM2 and the partition plate 53 and the sound plate 30 corresponding to the resonance chambers RM2 are given parentheses “(1), (2)”, respectively. To distinguish. The diagonal plate 55 that connects the two partition plates 53 (1) and 53 (2) has a rear portion from the center in the front-rear direction of the partition plate 53 (1), and a front portion from the center in the front-rear direction of the partition plate 53 (2). It is fixed with adhesive etc.

  On the other hand, in the sound source unit UNT, the front and rear and left and right center positions of the hammer felt 24 (see FIG. 1) coincide with the antinode center 31P corresponding to the antinode in vibration in the longitudinal center portion of the corresponding sound plate 30. . Further, the antinode centers 31P of all the sound boards 30 have the same position in the front-rear direction.

  As shown in FIG. 4, the sound plates 30 (1) and 30 (2) are arranged between the partition plates 53 (1) and 53 (2). Of the space between the partition plates 53 (1) and 53 (2), the front portion of the oblique plate 55 is the resonance chamber RM 2 (1), and the rear portion is the resonance chamber RM 2 (2). In plan view, the antinode 31P of the sound board 30 (1) is included in the resonance chamber RM2 (1), and the antinode 31P of the sound board 30 (2) adjacent to the high sound side of the sound board 30 (1) is It is included in the resonance chamber RM2 (2). Therefore, the sounds of the sound plates 30 (1) and 30 (2) resonate in the resonance chambers RM2 (1) and RM2 (2) that correspond one-on-one. Thus, the abdominal centers 31P of all the sound plates 30 are located in the corresponding resonance chambers RM in plan view.

  In the low sound region portion 50A, the angle and length of the oblique plate 54 are different from those of the oblique plate 55 due to the difference in the width of the sound plate 30 compared to the middle sound region portion 50B (see FIG. 3). The basic configuration is the same. As shown in FIGS. 2 and 3, in the low sound region portion 50 </ b> A, a port forming member 60 is provided below each resonance chamber RM <b> 1. A port is formed by the two partition plates 53, the oblique plate 54, and the port forming member 60 in the opening 61 of each resonance chamber RM <b> 1 (except for the left end portion). In general, in a Helmholtz type resonance box, not only the volume of a resonance chamber but also the length and cross-sectional area of a port affect the pitch of resonance. For example, even in a resonance chamber having the same volume, when the length of the port is increased or the cross-sectional area is decreased, the resonance pitch (resonance frequency) is lowered. Also in the present embodiment, by appropriately setting the shape of the port forming member 60, the length and cross-sectional area of the port corresponding to each resonance chamber RM1 are adjusted, and the sound of the pitch of the corresponding sound plate 30 is adjusted. Are configured to resonate well.

  On the other hand, in the middle sound range portion 50B, as described below, not only the volume of each resonance chamber RM2 but also the opening area of the through hole 91 located on the opposite side of the sound plate 30 is set individually. The resonance chamber RM2 is configured to have a specific resonance frequency.

  FIG. 5A is a partial plan view of the mid-range part 50B of the sound source unit UNT. FIG.5 (b) is sectional drawing which follows the AA line of Fig.5 (a). Of the five blocks (see FIG. 2) of the mid-range 50B, the second block 50Ba from the treble side is shown in FIG. 5 (a). In FIG. 3, FIG. 5 (a), (b), only the thing of the block 50Ba among several through-holes 91 is attached | subjected, and the code | symbol of serial number 91A1-91A6 is attached | subjected for description. In addition, among the lid members 57, when the block member 50Ba is particularly distinguished, it is referred to as “lid member 57A”.

  As shown in FIG. 5A, the through holes 91A1 to 91A6 are formed at positions corresponding to the upper portions of the six resonance chambers RM2 (RM2-1 to RM2-6) of the block 50Ba in the lid member 57A. Has been. As shown in FIG. 5B, the lid member 57A has a uniform thickness throughout, and the through holes 91A1 to 91A6 have the same depth (length in the vertical direction).

  Here, the present applicant has not only the volume described above as a parameter related to the resonance frequency of each resonance chamber RM2, that is, the pitch that can be resonated, in the semi-closed tube-type midrange 50B. The present inventors have determined that the hole diameter (opening area) of the through hole 91 and the depth of the through hole 91 exist. Specifically, in order to resonate a higher frequency, the opening area of the through hole 91 which is the opening on the opposite side of the sound plate 30 is set large, and the depth of the through hole 91 is set shallow. I found out what I should do. Incidentally, the resonance frequency can be increased by reducing the volume of the resonance chamber RM2.

  In the present embodiment, since the depth of the through hole 91 is common, an appropriate resonance that matches the specific pitch of the corresponding sound plate 30 depending on the combination of the volume of each resonance chamber RM2 and the hole diameter of the through hole 91. It was configured to have a frequency.

  For example, as shown in FIG. 5A, the resonance chamber RM2-1 and the resonance chamber RM2-2 have the same volume. Further, the through hole 91A2 corresponding to the resonance chamber RM2-2 has a larger opening area than the through hole 91A1 corresponding to the resonance chamber RM2-1. Accordingly, the resonance frequency of the resonance chamber RM2-2 is higher than that of the resonance chamber RM2-1 although the volume is the same. The relationship between the resonance chamber RM2-3 and the resonance chamber RM2-4, and the relationship between the resonance chamber RM2-5 and the resonance chamber RM2-6 are the same.

  In order to manufacture the sound source unit UNT, first, the partition plate 53 is fixed to the front common wall 51 and the rear common wall 52 by bonding or the like, and the oblique plates 54 and 55 are fixed between the adjacent partition plates 53 by bonding or the like. . On the other hand, an appropriate through hole 91 is formed in the lid member 57 in advance, and the lid members 56 to 58 are covered from above, and are adhered to the partition plate 53, the front common wall 51, the rear common wall 52, and the like. Fix with etc. In addition, about the cover member 57, after adhering and fixing, you may make it drill the appropriate through-hole 91. FIG.

  FIG. 6 is a partial plan view of the mid-range 50B of the sound source unit UNT. The lid member 57 is made of wood, for example, and the through hole 91 is opened with a drilling tool such as a drill. At this time, if the resonance frequency is deviated from the target, fine adjustment is performed as follows.

  For example, as shown in the figure, when the resonance frequency of the resonance chambers RM2-3 is lower than the target, a chamfer 93 is provided above the through hole 91A3. Thereby, since the substantial depth of through-hole 91A3 becomes shallow, the resonant frequency of resonance chamber RM2-3 becomes high. When the resonance frequency of the resonance chamber RM2-4 is higher than the target, the plate piece 92 is fixed to the lid member 57A so as to cover a part of the through hole 91A4. Thereby, since the substantial opening area of through-hole 91A4 becomes small, the resonant frequency of resonance chamber RM2-4 becomes low.

  In this way, the additional adjustment of the chamfer 93 with respect to the through hole 91 or the arrangement of the plate piece 92 makes it possible to easily finely adjust the resonance frequency individually for each resonance chamber RM2, and to provide a more appropriate resonance frequency. Easy setting can be made possible.

  According to the present embodiment, in the mid-range part 50B of the sound source unit UNT, the through holes 91 that are located on the opposite side of the corresponding sound board 30 and are opened are provided in connection with the corresponding resonance chambers RM2, By appropriately setting the opening area of the through hole 91, a musical tone having a specific pitch generated by the corresponding sound board 30 is resonated. Thereby, by setting the opening area of the through hole 91, the resonance frequency unique to each resonance chamber RM2 can be adjusted, and the degree of freedom in designing the resonance box 50 can be increased.

  Note that the present invention can be applied even if the resonance chambers RM have a configuration in which the resonance plates RM are arranged in parallel correspondingly.

(Second Embodiment)
In the first embodiment, the front common wall 51 and the rear common wall 52 of the resonance box 50 have a “C” shape (see FIG. 3 and the like), and the volume of the resonance chamber RM adjacent in the left-right direction. Was different. On the other hand, in the second embodiment of the present invention, the shape and volume of the plurality of resonance chambers RM arranged in the left-right direction are made common.

  FIG. 7A is a partial plan view of a mid-range part in the resonance box according to the second embodiment. FIG. 7B is a partial front view of the same midrange part.

  In this resonance box, the front common wall 151 and the rear common wall 152 corresponding to the front common wall 51 and the rear common wall 52 are parallel to each other. The front common wall 151 and the rear common wall 152 do not have to be parallel over the entire resonance box. For example, the common common wall 151 and the rear common wall 152 may be provided for each block having the same height of the resonance chamber RM in the middle range. . One lid member 94 corresponding to the lid member 57 is different only in plan view shape, and the configuration of the through hole 91 is the same as that of the first embodiment.

  In one block, there are six spaces defined by the front common wall 151 and the rear common wall 152, the partition plate 53, the partition plate 96 corresponding to the oblique plate 55, the oblique plate 95, and the lid member 94. The resonance chamber RM4 (RM4-1 to RM4-6) corresponds to the resonance chamber RM2.

  As shown in FIGS. 7A and 7B, these six resonance chambers RM4 have the same height and the same width in the front-rear and left-right directions, and thus have the same shape and volume. However, the through hole 91 differs between the resonance chambers RM4. Further, since the thickness of the lid member 94 is uniform, the depth of each through hole 91 is the same.

  Therefore, the resonance frequency RM4 having a larger diameter of the through hole 91 has a higher resonance frequency, and the resonance frequency of the resonance chamber RM4-6 is the highest in the block. In this way, the resonance chambers RM4 share the same shape and volume, but have different opening areas of the through holes 91, so that the pitches produced by the corresponding sound plates 30 can be satisfactorily resonated. can do.

  FIG. 7C is a partial plan view of a mid-frequency region in a modification of the resonance box of the second embodiment. FIG. 7D is a partial front view of the same midrange part.

  In this modification, the configuration of the lid member is different from the configuration of FIGS. 7 (a) and 7 (b). FIG. 7A and FIG. 7B show blocks on the higher sound side than the mid-range block shown in FIG. 7, and the shape and arrangement angle of the oblique plate 97 are compared to the oblique plate 95 according to the sound range. Although different, the basic configuration is the same. The lid member 99 in this modification example has a narrower width in the front-rear direction as it goes to the high sound side.

  In plan view, an opening 98 is formed between the partition plate 96, the lid member 99, and the front common wall 151 or the rear common wall 152. The opening 98 of each resonance chamber RM4 is larger as it is higher. Although not clearly shown in the drawings, the openings 98 of the resonance chambers RM4-2, 4, and 6 are slightly wider than the openings 98 of the resonance chambers RM4-1, 3, and 5. .

  In this way, instead of the through-hole 91, the shape of the lid member 99 is devised to make the opening area of each resonance chamber RM4 different, so that each resonance chamber RM4 has the same shape and volume, but can cope with each. The pitch produced by the sound board 30 can be configured to resonate.

  According to the present embodiment, the same effects as those of the first embodiment can be obtained. Moreover, since the shape and volume of each resonance chamber RM4 are made common in the same block, the types of components (partition plate 96, diagonal plate 95, or diagonal plate 97) constituting the resonance chamber RM4 can be reduced. In particular, in the configuration shown in FIGS. 7C and 7D, the process of drilling the through hole can be omitted, so that the manufacture is facilitated.

(Third embodiment)
In the third embodiment of the present invention, resonance tubes having resonance chambers are individually configured. Each resonance tube is configured to have a unique resonance frequency. In the keyboard instrument 10, a plurality of resonance tubes can be arranged instead of the resonance box 50.

  FIGS. 8A, 8C, 8E, and 8G are plan views of the resonance tube 100 (100A to 100D) according to the third embodiment of the present invention, and FIGS. ), (F), (h) are front views thereof. Since these four resonance tubes 100 differ only in the presence or absence of the through holes 104 (104B to 104D) and their diameters, and the other configurations are the same, the configurations of FIGS. 8C and 8D are representative. I will explain.

  8C and 8D, a resonance tube 100B includes two front and rear walls 102 and 102 that face each other, two left and right walls 101 and 101 that face each other, and a lid member that is fixed to the upper ends of the front and rear walls 102. 103B, and these define the resonance chamber RM5. When the resonance tube 100 is appropriately disposed on the keyboard instrument 10, the opening 61 that opens to the lower side of the resonance chamber RM 5 is in close proximity to the corresponding sound plate 30. In the resonance tube 100B, the front and rear walls 102 correspond to a part of the front common wall 51 and the rear common wall 52, and the lid member 103B corresponds to the lid member 57. One resonance tube 100 corresponds to one sound plate 30.

  The lid member 103B is provided with a through hole 104B corresponding to the through hole 91 (see FIGS. 5 and 7A). In the four types of resonance tubes 100 shown in FIG. 8, the resonance chamber RM5 has the same shape and volume, and the lid members 103 (103A to 103D) have the same thickness. Only the diameter of the through hole 104 is zero (substantially a closed tube) in FIGS. 8 (a) and 8 (b), and the largest in FIGS. 8 (g) and (h). Of these four types of resonance tubes 100, the larger the diameter of the through hole 104, the higher the resonance frequency, and the resonance tube 100D shown in FIGS. 8 (g) and 8 (h) has the highest resonance frequency.

  According to the present embodiment, by making the opening area of the through hole 104 different for each resonance tube 100, the sound produced by the corresponding sound plate 30 while the shape and volume of each resonance chamber RM5 are common. The height can be configured to resonate, and the degree of freedom in designing the resonance tube can be increased.

  Although four types of the resonance tube 100 are illustrated, four or more types can be manufactured by changing the opening area of the through hole 104. Further, when the resonance tubes 100 having different resonance frequencies are manufactured for the number of keys and assembled to the keyboard musical instrument 10, the plurality of resonance tubes 100 may be assembled as a resonance box and assembled.

(Fourth embodiment)
In the third embodiment, the desired resonance frequency is set by changing only the opening area of the through hole 104. However, in the fourth embodiment of the present invention, only the depth of the through hole is achieved. It is realized by making different.

  FIGS. 9A to 9D are front views of a resonance tube according to the fourth embodiment of the present invention. The basic configuration of these resonance tubes 200 (200A to 200D) is the same as that of the third embodiment (see FIG. 8), and the resonance chamber RM5 (RM5A) is placed under the lid member 106 (106A to 106D). ~ RM5D) is formed. Each lid member 106 is formed with through holes 105 (105A to 105D) having the same diameter. However, the thicknesses of the lid members 106 are different from each other, and the depths of the through holes 105 are different from each other accordingly. The shapes and volumes of the resonance chambers RM5A to RM5D are the same. Of these four types of resonance tubes 200, the one with the shallower through hole 105 (the one with the thinner cover member 106) has a higher resonance frequency, and the resonance tube 200D shown in FIG. The highest resonance frequency.

  According to the present embodiment, by making the depth of the through hole 105 different for each resonance tube 200, the sound produced by the corresponding sound plate 30 while sharing the shape and volume of each resonance chamber RM5. The height can be made to resonate, and the same effects as those of the third embodiment can be achieved with respect to increasing the degree of freedom in designing the resonance tube.

  As described above, the resonance frequency can be adjusted not only by the opening area and depth of the opening on the opposite side of the sound board 30 but also by setting the volume of the resonance chamber. For example, as illustrated in FIGS. 10A to 10D, even if the opening area of the through hole 107 and the thickness of the lid member 108 (the depth of the through hole 107) are the same, the resonance chamber RM6 (RM6A to RM6A). By making the heights of RM6D) different and making the volumes different from each other, the smaller the volume, the higher the resonance frequency can be made. The resonance tube shown in FIG. 10 (d) has the highest resonance frequency.

  Therefore, when each resonance tube is manufactured individually, these parameters related to the resonance frequency may be appropriately combined so as to have different resonance frequencies. In this case, for example, if the shape and volume of the resonance chamber RM are made common among the plurality of resonance tubes, the configuration of the components constituting the resonance chamber RM can be made common. If the diameter of the through hole is made common, the drilling tool can be made common, which leads to simplification of the drilling process. On the other hand, if the depth of the through hole is made common, the lid member in the stage before providing the through hole is made common, or one lid member having a uniform thickness is applied between the plurality of resonance chambers (first implementation) It is also easy to do this. In this way, the configuration and manufacturing process can be simplified.

  It should be noted that these methods of manufacturing a resonance tube with a combination of parameters related to the resonance frequency can be applied even when configured as a resonance box 50 having a plurality of resonance chambers as shown in the first embodiment. Is possible. Accordingly, the configuration of each resonance chamber and the corresponding through hole or lid member can be shared by a plurality.

  It is also possible to design many types of resonance tubes having the same resonance frequency or resonance chambers of the resonance box with different combinations of parameters. Therefore, it is easy to design the size of the resonance tube or the resonance chamber according to the type of the keyboard instrument, and the degree of freedom in designing the keyboard instrument is increased.

  Note that the resonance box in the first embodiment and the resonance tube in the second to fourth embodiments can be applied to Glockenspiel, and can also be applied to soundboard percussion instruments other than keyboard instruments. is there.

  In each of the above embodiments, the resonance box or the resonance tube is not limited to wooden. The same applies to the lid member. For example, when the lid member 57 or the like in the first embodiment is formed of resin, a through hole 91 (see FIGS. 3 and 5) or the like may be provided at the mold forming stage.

  The through hole in the resonance box or the resonance tube may not be circular, and the shape is not limited as long as it is open on the opposite side of the sound plate 30.

It is sectional drawing which shows the internal structure of the upper half part of the keyboard instrument to which the resonance box which concerns on the 1st Embodiment of this invention is applied. It is a front view of a sound source unit. It is a top view of a sound source unit. It is a partial horizontal sectional view of the midrange part of the sound source unit. FIG. 2 is a partial plan view (FIG. (A)) of a mid-range part of a sound source unit, and a cross-sectional view (FIG. (B)) taken along line AA in FIG. It is a partial top view of the mid range part of a sound source unit. The partial plan view (figure (a)), the partial front view (figure (b)) of the midrange part in the resonance box which relates to the 2nd execution form of this invention, the midrange part in the modification of the resonance box of the form They are a partial top view (figure (c)) and a partial front view (figure (d)). The top view (figure (a), (c), (e), (g)) of the resonance tube concerning a 3rd embodiment of the present invention, and those front views (figure (b), (d), (F), (h)). It is a front view (figure (a)-(d)) of a resonance pipe concerning a 4th embodiment of the present invention. It is a front view (figure (a)-(d)) of a resonance pipe which made volume of a resonance room differ.

Explanation of symbols

  10 keyboard instrument (sound percussion instrument), 30 sound board, 50 resonance box, 61 opening (first opening), 100, 200 resonance tube, 91, 104, 105, 107 through hole (second opening), RM Resonance chamber

Claims (5)

A resonance box for a sound board percussion instrument arranged in a sound board percussion instrument having a plurality of sound boards,
Resonance chambers that are provided corresponding to the respective sound plates, and that resonate a musical tone of a specific pitch that the corresponding sound plate generates,
When connected to each of the resonance chambers, when the resonance box is disposed on the sound board percussion instrument, an opening that opens to face the corresponding sound board;
When the resonance box is disposed on the sound board percussion instrument, the cover is located on the opposite side of the corresponding sound board and has a through hole for each resonance chamber,
Each of the resonance chambers resonates a musical tone having a specific pitch that is generated by the corresponding sound plate, because at least one of the cross-sectional area and the depth of the through hole is different between the resonance chambers. A resonance box for a soundboard percussion instrument characterized by being configured as described above.   A chamfer is provided on the opening side of the through hole of the lid member, and the resonance chambers have at least one of a cross-sectional area and a depth of the non-chamfered portion of the through hole between the resonance chambers. 2. A resonance box for a soundboard percussion instrument according to claim 1, wherein the soundboxes are configured so as to resonate the musical tones having a specific pitch generated by the corresponding soundboards.   The opening side of the through hole of the lid member is covered with another member to reduce the opening area, and each resonance chamber has at least one of the opening area of the through hole and the depth of the through hole. 2. The sound board percussion instrument according to claim 1, wherein the resonance chambers are configured to resonate musical tones having specific pitches generated by the corresponding sound boards by being different from each other. Resonance box. A resonance box for a sound board percussion instrument arranged in a sound board percussion instrument having a plurality of sound boards,
Resonance chambers that are provided corresponding to the respective sound plates, and that resonate a musical tone of a specific pitch that the corresponding sound plate generates,
A first opening that is connected to each of the resonance chambers and that opens to face the corresponding sound plate when the resonance box is disposed in the sound plate percussion instrument;
A second opening that is connected to each of the resonance chambers and that is open on the opposite side of the corresponding sound board when the resonance box is disposed on the sound board percussion instrument;
Each of the resonance chambers has a cross-sectional area of a region that penetrates straight with a constant cross-sectional area from the inside of the resonance chamber to the outside of the second opening , and the resonance chambers are different from each other. A resonance box for a musical plate percussion instrument, which is configured to resonate a musical tone having a specific pitch generated by a corresponding musical plate.   5. The resonance box for a soundboard percussion instrument according to claim 1, wherein a shape and a volume of each resonance chamber are common among a plurality of resonance chambers.

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