Percussion instrument and tension application method

Abstract

To provide a percussion instrument in which thickness of a housing can be reduced and a tension application method.SOLUTION: Since a fixing part 72 of a lug 7 extends to an inner peripheral side from an outer peripheral face of a body part 30 (housing 1) and is fixed to a lower face of a bottom frame 2 (housing 1) by a fixing bolt B2, a tension bolt B1 for applying tension to a head 4 and a fixing bolt B2 for fixing the lug 7 to the bottom frame 2 can be arranged by shifting them in a radial direction. Thus, a dimension in a vertical direction of the lug 7 can be reduced, and thickness of the bottom frame 2 (housing 1) can be reduced.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a percussion instrument and a method of imparting tension, and more particularly to a percussion instrument and a method of imparting tension that enable a thinner housing. [Background technology]

[0002] There is known a percussion instrument in which tension is applied to the head by fastening (screwing) a tension bolt to a lug provided on the outer circumferential surface of the housing. For example, Patent Document 1 describes a technique for fixing a fastening portion 20 (lug) to the outer circumferential surface of a shell 2 (housing) with a bolt. Patent Document 2 describes a technique for providing a back hoop 5 on the lower surface side of a cylindrical member 2 (housing) and fastening a second screw rod 63 inserted from below the back hoop 5 to a connecting portion 6 (lug). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2021-105702 A (for example, FIG. 2) [Patent Document 2] JP 2014-130373 A (for example, paragraphs 0034 and 0037, FIG. 4) Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the technology of Patent Document 1, the fastening portion 20 is screwed at two points separated vertically, so that the shell 2 needs to be made thicker (longer vertically). Also, in the technology of Patent Document 2, the connecting portion 6 needs to be made longer in order to fasten the second screw rod 63, and therefore the cylindrical member 2 also needs to be made thicker. In other words, these conventional technologies have a problem in that the housing of the percussion instrument cannot be made thinner.

[0005] The present invention has been made to solve the above-mentioned problems, and has an object to provide a percussion instrument and a method of applying tension that enable a thinner body. [Means for solving the problem]

[0006] To achieve this objective, the percussion instrument of the present invention comprises a case having a cylindrical body, a head covering an opening on the upper side of the body, a tension bolt for pulling the outer edge of the head downward to apply tension, a lug to which the tension bolt is fastened, and a first bolt for securing the lug to the case, the lug having a fastening portion to which the tension bolt is fastened, and a fixing portion extending inward beyond the fastening portion and fixed to the underside of the case by the first bolt.

[0007] The present invention provides a method of applying tension to a head of a percussion instrument comprising a casing having a cylindrical body, a head covering the opening at the upper end of the body, a tension bolt for pulling the outer edge of the head downward, a lug to which the tension bolt is fastened, and a first bolt for fixing the lug to the casing, the lug having a fastening portion and a fixing portion extending more inward than the fastening portion and fixed to the underside of the casing by the first bolt, wherein tension is applied to the head by fastening the tension bolt to the fastening portion. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is an exploded perspective view of a percussion instrument according to a first embodiment. [Diagram 2] 1A is a perspective view of the bottom frame as viewed from the bottom side, and FIG. 1B is a perspective view of the lugs and the anti-loosening mechanism. [Diagram 3] FIG. 2 is an exploded perspective view of the housing of the percussion instrument. [Figure 4] 4(a) is a partially enlarged cross-sectional view of the percussion instrument taken along line IVa-IVa in FIG. 3, and FIG. 4(b) is a cross-sectional view of the radiating portion taken along line IVb-IVb in FIG. 4(a). [Diagram 5]4 is a partially enlarged cross-sectional view of the percussion instrument taken along line VV in FIG. 3. [Figure 6] FIG. 11 is a partially enlarged cross-sectional view of the percussion instrument of the second embodiment. [Figure 7] FIG. 11 is a perspective view of a percussion instrument according to a third embodiment. [Figure 8] 8 is a partially enlarged cross-sectional view of the percussion instrument taken along line VIII-VIII in FIG. 7. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Preferred embodiments will now be described with reference to the accompanying drawings. First, the overall configuration of a percussion instrument 100 according to a first embodiment will be described with reference to Fig. 1. Fig. 1 is an exploded perspective view of the percussion instrument 100 according to the first embodiment. In order to simplify the drawing, Fig. 1 only shows a protrusion 29 (a portion supporting a head sensor 10) (to be described later) of the internal structure of the bottom frame 2 hidden by a support portion 31 of a top frame 3.

[0010] As shown in Fig. 1, percussion instrument 100 is an electronic percussion instrument that imitates an acoustic drum, and includes a housing 1 that constitutes its main body. Housing 1 includes a substantially disk-shaped bottom frame 2 that constitutes its bottom surface, and a top frame 3 that is placed on top of bottom frame 2. The bottom frame 2 and top frame 3 are frames for supporting a head sensor 10 and a rim sensor 11, and the support structures for these sensors 10, 11 will be described later with reference to Figs. 5 and 6.

[0011] The top frame 3 includes a cylindrical body portion 30 and a support portion 31 that supports the rim sensor 11 on the inner circumferential side of the body portion 30, and these portions 30, 31 are integrally formed using a resin material. In the following explanation, the direction perpendicular to the axis of the cylindrical body portion 30 is referred to as the radial direction, and the direction around the axis of the body portion 30 is referred to as the circumferential direction.

[0012] The opening on the upper surface of the body 30 is covered with the membrane-like head 4, and the upper surface of the head 4 becomes the striking surface of the percussion instrument 100. The head 4 is formed into a disk shape using a mesh woven from synthetic fibers, and a circular head frame 40 is fixed to the outer edge of the head 4.

[0013] The head frame 40 is made of a resin material, and the head 4 and the head frame 40 are integrally molded by die molding. The head frame 40 may be made of a material other than resin (for example, metal or wood), and the head frame 40 may be joined to the head 4 by adhesion or the like.

[0014] The head 4 is attached to the housing 1 by the hoop 6 together with the annular rim 5, and in this attached state, the entire outer edge of the head 4 is surrounded by the rim 5. The rim 5 is a member for performing a rim shot in which the player strikes the head 4 and rim 5 simultaneously, or a rim-only shot in which only the rim 5 is struck. The rim 5 comprises an annular struck portion 50 that receives the strike by the player, and a roughly rectangular parallelepiped clamped portion 51 formed on the outer circumferential surface of the struck portion 50, and these portions 50, 51 are integrally formed using a resin material (such as rubber or elastomer) that is softer than the hoop 6.

[0015] The clamped portions 51 are formed at multiple locations (16 locations in this embodiment) at equal (or unequal) intervals in the circumferential direction of the struck portion 50, and multiple accommodating portions 60 are formed on the inner peripheral surface of the hoop 6 at positions corresponding to the clamped portions 51. The accommodating portions 60 are recesses having a shape corresponding to the clamped portions 51, and when the rim 5 is attached to the upper surface of the head 4, the clamped portions 51 are accommodated in the accommodating portions 60. Note that the attachment structure of the rim 5 can be a known structure and will not be described in detail, but an example of a known structure is the attachment structure of the rim 5 disclosed in JP 2019-148623 A.

[0016] The hoop 6 has through holes 61 (see Figure 4(a)) for inserting the tension bolts B1 formed at equal intervals around the circumferential direction, and the housing 1 has a plurality of lugs 7 (six in this embodiment) for fastening (screwing) the tension bolts B1 at equal intervals around the circumferential direction.

[0017] The lug 7 includes a fastening portion 70 that is disposed on the outer periphery side of the body portion 30 of the top frame 3, and a vertically extending female threaded hole 70a is formed in the fastening portion 70. With the clamped portion 51 of the rim 5 fitted into the housing portion 60 of the hoop 6 and the head frame 40 of the head 4 hooked onto the hoop 6, tension is applied to the head 4 by fastening a tension bolt B1 into the female threaded hole 70a of the lug 7. Next, a detailed configuration of the housing 1 will be described with reference to Figs. 2 and 3.

[0018] Fig. 2(a) is a perspective view of the bottom frame 2 as viewed from below, and Fig. 2(b) is a perspective view of the lugs 7 and the locking mechanism 8. Fig. 3 is an exploded perspective view of the body 1 of the percussion instrument 100.

[0019] As shown in Figures 2 and 3, the bottom frame 2 of the housing 1 has a circular (approximately disk-shaped) central portion 20 that forms its central part, a plurality of radiating portions 21 extending radially from the central portion 20, and an annular outer peripheral portion 22 that connects the outer edges of the plurality of radiating portions 21, and each of these portions 20-22 is integrally formed using a resin material.

[0020] The central portion 20 is a portion provided in a region including the axis of the body portion 30. Note that the central portion 20 is provided with a plurality of recesses (plate-like ribs that divide the central portion 20) and electronic components such as a circuit board, but in Fig. 2, these recesses and electronic components are omitted from the illustration in order to simplify the drawing.

[0021] The radiating portion 21 extends radially from the central portion 20 toward the outer periphery. A plurality of (six in this embodiment) radiating portions 21 are arranged at equal intervals in the circumferential direction, and therefore a plurality of (six in this embodiment) substantially triangular sound emission holes 23 that penetrate the bottom frame 2 from top to bottom are formed between the plurality of radiating portions 21.

[0022] Although the configuration for forming such sound emission holes 23 is publicly known (for example, JP 2004-198657 A), forming a plurality of sound emission holes 23 in the bottom frame 2 makes it easier for vibrations generated when the head 4 (see FIG. 1) is struck to be emitted to the outside through the sound emission holes 23, but also makes it easier for the rigidity of the bottom frame 2 to decrease. In contrast, in this embodiment, recesses 24a to 24c for reinforcing the bottom frame 2 are formed in the radiation portion 21 (see FIG. 2). These recesses 24a to 24c are portions for fixing the lugs 7 (see FIG. 2(b)).

[0023] The recesses 24a to 24c formed on the lower surface of the radiating portion 21 are formed in a groove shape extending from the central portion 20 side of the bottom frame 2 to the outer periphery (along the radial direction). This makes it possible to eliminate the need to form ribs (for example, rib 34 in JP 2021-105702 A) as in the conventional technology for the radiating portion 21 of the bottom frame 2, or to reduce the number of ribs to be formed, while ensuring the rigidity of the bottom frame 2 (radiating portion 21) by the recesses 24a to 24c. Therefore, even if the bottom frame 2 is molded from resin, it is possible to suppress the occurrence of sink marks in the radiating portion 21, and improve the appearance of the percussion instrument 100 while reinforcing the bottom frame 2 with the recesses 24a to 24c.

[0024] The recess 24a is a recess extending from the central portion 20 side toward the outer periphery, and the recess 24b is a recess formed so as to be continuous with the end portion on the outer periphery side of the recess 24a. These recesses 24a, 24b are formed in a region including the center of the radiation portion 21 in the circumferential direction, and in the region where the recess 24a is formed, the width dimension of the radiation portion 21 in the circumferential direction (the thickness of the radiation portion 21 in the circumferential direction) is gradually formed to be smaller toward the recess 24b. Also, in the region where the recess 24b (recess 24c) is formed, the width dimension of the radiation portion 21 in the circumferential direction is gradually formed to be larger toward the outer periphery.

[0025] In contrast, the width dimension of the recess 24a in the circumferential direction (the opening width of the recess 24a in the circumferential direction) is also gradually made smaller toward the recess 24b, and the width dimension of the recess 24b in the same direction is also gradually made larger toward the outer periphery. This makes it possible to uniformly increase the rigidity of the radiating portion 21 in its longitudinal direction (the region where the recesses 24a, 24b are formed). Also, by similarly changing the width dimensions of the recesses 24a, 24b in accordance with the change in the width dimension of the radiating portion 21, the appearance of the percussion instrument 100 can be improved.

[0026] The bottom surface (surface facing downward) of the recess 24a is a flat surface that slopes downward toward the outer periphery (see FIG. 4(a)), and the bottom surface 21a of the radiation portion 21 is a curved surface that slopes gradually upward toward the outer periphery (see FIG. 4(a)). Therefore, the depth of the recess 24a relative to the bottom surface 21a of the radiation portion 21 is formed to be gradually shallower from the central portion 20 side toward the outer periphery. Hereinafter, the depth of the recesses 24a to 24c relative to the bottom surface 21a of the radiation portion 21 will be simply described as the "depth of the recess 24a" or the like.

[0027] The depth of the inner edge portion (end portion on the inner periphery side) of the recess 24b is formed deeper than the depth of the outer edge portion (end portion on the outer periphery side) of the recess 24a, and a step is formed at the boundary portion (connection portion) of these recesses 24a and 24b. By forming such a step, the rigidity of the radiation portion 21 can be effectively improved.

[0028] The bottom surface of the recess 24b is composed of a horizontal surface extending from the inner edge toward the outer edge, and an inclined surface connected to the outer edge of the horizontal surface and inclined upward toward the outer periphery. The depth of the recess 24b also becomes gradually shallower from the inner periphery toward the outer periphery.

[0029] The inner edge of the recess 24c is located on the outer periphery side of the inner edge of the recess 24b, and the recess 24c is formed in a region including the circumferential center of the bottom surface of the recess 24b. That is, the recess 24c is a groove that is recessed deeper than the bottom surface of the recess 24b, so that the step formed by these recesses 24b, 24c can also effectively improve the rigidity of the radiation portion 21.

[0030] The recesses 24b and 24c each extend to the outer edge of the bottom frame 2, and the lug 7 is fixed by utilizing these recesses 24b, 24c.

[0031] The lug 7 comprises a lower surface portion 71 that extends inward from the lower end of the fastening portion 70 and forms the lower surface of the lug 7, and a fixing portion 72 that rises from the lower surface portion 71 and is fixed to the bottom frame 2, and each of these portions 70 to 72 is integrally formed using metal.

[0032] The fastening portion 70 is formed with a cavity 70c having an opening 70b on the inner circumferential side (inner peripheral surface) of the fastening portion 70, and the above-mentioned female screw hole 70a is connected to this cavity 70c. The lower surface portion 71 of the lug 7 is formed in a plate shape extending from the lower edge of the fastening portion 70 (cavity 70c) to the inner circumferential side, and the fixing portion 72 protrudes upward from a region including the center of the lower surface portion 71 in the circumferential direction. In other words, the lower surface portion 71 protrudes in a flange shape from the side surface (surface facing the circumferential direction) of the fixing portion 72 and the lower end of the inner circumferential surface.

[0033] A locking device 8 for preventing loosening of the tension bolt B1 (see FIG. 1) is inserted into the cavity 70c of the fastening portion 70. The locking device 8 includes a main body 80 having a shape (approximately semi-cylindrical) corresponding to the internal space of the cavity 70c of the fastening portion 70, and a pair of legs 81 protruding downward from the bottom surface of the main body 80, and these parts 80, 81 are integrally formed using a resin material.

[0034] The main body 80 has a threaded hole 82 extending vertically, so that when the anti-loosening device 8 is inserted into the cavity 70c and the tension bolt B1 is fastened to the threaded hole 70a of the fastening portion 70, the tension bolt B1 is also fastened to the threaded hole 82 of the anti-loosening device 8 (see Figure 4(a) for the state in which the tension bolt B1 is fastened to the anti-loosening device 8).

[0035] The fixing portion 72 is formed in a generally rectangular parallelepiped shape whose radial dimension is longer than its circumferential dimension, and this generally rectangular parallelepiped fixing portion 72 extending radially extends into the cavity 70c of the fastening portion 70. When the main body 80 of the loosening prevention device 8 is inserted into the cavity 70c, a pair of legs 81 spaced apart in the circumferential direction are disposed to sandwich the fixing portion 72. Therefore, even if the loosening prevention device 8 attempts to rotate when the tension bolt B1 is fastened into the female threaded hole 82, the rotation is restricted by the engagement between the pair of legs 81 and the fixing portion 72.

[0036] In this way, by hooking the pair of legs 81 onto the fixing portion 72 that extends into the cavity 70c, the fixing portion 72 can be used to restrict rotation of the locking device 8. Furthermore, by sliding the locking device 8 toward the cavity 70c with the pair of legs 81 hooked onto the fixing portion 72 (with the main body 80 placed on the fixing portion 72), the insertion of the locking device 8 into the cavity 70c can be guided by the fixing portion 72. This improves the ease of assembly of the lug 7.

[0037] The outer shape (upper and side surfaces) of the lower surface portion 71 is formed to match the bottom surface and side surfaces (surfaces surrounding the bottom surface) of the recess 24b described above, and the outer shape of the fixing portion 72 is also formed to match the recess 24c. A pair of female screw holes 73, 74 aligned in the radial direction (longitudinal direction of the fixing portion 72) are formed in the fixing portion 72 of the lug 7. The pair of female screw holes 73, 74 are for fixing the lug 7 to the lower surface of the bottom frame 2, and when fixing the lug 7 to the bottom frame 2, the fixing portion 72 and the lower surface portion 71 of the lug 7 are fitted into the recess 24b and the recess 24c.

[0038] When the lug 7 is fitted into the recesses 24b and 24c, the recesses 24b and 24c are covered by the lug 7, whereas the recess 24a is exposed to the lower surface side of the bottom frame 2 without being covered by the lug 7. In this case, for example, if a rib (a plate-shaped wall extending in the circumferential direction) is formed to divide the recess 24a, the rigidity of the radiating portion 21 is increased, but the rib is exposed to the lower surface side of the percussion instrument 100, deteriorating the appearance.

[0039] In contrast, in this embodiment, the recess 24a is formed as a single groove that continues in the radial direction. In other words, the recess 24a does not have a rib as described above, and the radiating portion 21 is reinforced by the steps that are generated by forming the recesses 24a to 24c. This makes it possible to improve the appearance of the percussion instrument 100 while ensuring the rigidity of the bottom frame 2.

[0040] Next, a detailed configuration of the housing 1 including the mounting structure of the lug 7 will be described with reference to Fig. 3 and Fig. 4. Fig. 4(a) is a partially enlarged cross-sectional view of the percussion instrument 100 taken along line IVa-IVa in Fig. 3, and Fig. 4(b) is a cross-sectional view of the radiating portion 21 taken along line IVb-IVb in Fig. 4(a). Note that Fig. 4(a) illustrates a cut end surface cut along a plane including the axis of the body 30 and the tension bolt B1, and Fig. 4(b) illustrates the cut end surface of the radiating portion 21, but Fig. 4(a) illustrates the bottom surface 21a of the radiating portion 21 located behind the cut surface (in the direction perpendicular to the paper) by a solid line.

[0041] As shown in Figures 3 and 4, a pair of through holes 25, 26 aligned radially are formed in the radiation part 21 and the outer peripheral part 22 of the bottom frame 2 at positions corresponding to the female screw holes 73, 74 of the lug 7. The pair of through holes 25, 26 vertically penetrate the radiation part 21 and the outer peripheral part 22 and are connected to the bottom surface of the recess 24c. The pair of through holes 25, 26 are holes for screwing the lug 7 with the fixing bolt B2, and the reinforcing frame 9 is also fastened together with the fixing bolt B2. The reinforcing frame 9 is a frame that forms the skeleton of the housing 1 together with the bottom frame 2 and the top frame 3.

[0042] The reinforcing frame 9 comprises a circular ring portion 90 (see Figure 3) that is overlapped on the outer circumferential portion 22 of the bottom frame 2, and a protrusion portion 91 that protrudes from the circular ring portion 90 toward the inner circumferential side, and each of these portions 90, 91 is integrally formed using a metal plate.

[0043] A pair of through holes 92, 93 (see FIG. 4(a)) are formed in the annular portion 90 and the protruding portion 91 of the reinforcing frame 9 at positions corresponding to the through holes 25, 26 of the bottom frame 2. The bottom frame 2 and the reinforcing frame 9 are fastened together to the lug 7 by fastening a fixing bolt B2 inserted into each of the through holes 25, 26, 92, 93 of the bottom frame 2 and the reinforcing frame 9 into the female threaded holes 73, 74 of the lug 7.

[0044] As described above, in this embodiment, the reinforcing frame 9 (annular portion 90) formed using a material (metal plate) harder than the bottom frame 2 is fixed to the outer periphery 22 of the bottom frame 2. The reinforcing frame 9 includes the protruding portion 91 that protrudes from its inner periphery and is fixed (screwed) to the radiating portion 21, so that the rigidity of the radiating portion 21 can be effectively increased by the protruding portion 91.

[0045] Furthermore, since the fixing portion 72 of the lug 7 extends inward from the outer circumferential surface of the body 30 (housing 1) and is fixed to the bottom surface of the bottom frame 2 (housing 1) by the fixing bolt B2, the tension bolt B1 (see FIG. 4(a)) for applying tension to the head 4 and the fixing bolt B2 for fixing the lug 7 to the bottom frame 2 can be arranged with a radial offset. This makes it possible to reduce the vertical dimension of the lug 7 compared to a structure in which a bolt for fixing the lug to the housing is fastened from below the lug, as in the prior art (for example, JP 2014-130373 A). This allows the bottom frame 2 (housing 1) to be made thinner.

[0046] Furthermore, since the fixing bolt B2 inserted into the bottom frame 2 (reinforcement frame 9) from above is fastened to the fixing portion 72, the head of the fixing bolt B2 is prevented from being exposed on the underside of the lug 7. This improves the appearance of the percussion instrument 100.

[0047] Here, the lug 7 (fixing portion 72) is screwed to the underside of the bottom frame 2 by the fixing bolt B2, and the load applied when fastening the tension bolt B1 to the fastening portion 70 acts on the underside of the bottom frame 2 (housing 1) via the fixing bolt B2.

[0048] More specifically, if the contact point between the outer edge of the bottom frame 2 (the bottom surface of the recess 24c) and the fixed portion 72 of the lug 7 is defined as contact point P (see Figure 4(a)), when the tension bolt B1 is fastened to the fastening portion 70, a moment is generated that pulls the fastening portion 70 upward with contact point P as the center (fulcrum), while pulling the fixed portion 72 and the fixing bolt B2 downward, and as a result, a load acts on the underside of the bottom frame 2 (housing 1) via the fixing bolt B2.

[0049] In contrast, in this embodiment, the lug 7 (fixing portion 72) is screwed to the underside of the bottom frame 2 by two fixing bolts B2 arranged radially, so that the load acting on the bottom frame 2 when the tension bolt B1 is fastened can be dispersed to two locations in the radial direction. This makes it possible to make the bottom frame 2 thinner while ensuring the durability of the bottom frame 2 (housing 1) against the load when the tension bolt B is fastened.

[0050] As described above, the annular reinforcing frame 9 made of a material harder than the bottom frame 2 is placed on top of the bottom frame 2, and the frames 2, 9 and the fixing portion 72 are fastened together by the fixing bolt B2. This allows the reinforcing frame 9 to effectively reinforce the vicinity of the fixing bolt B2, where the load applied most when the tension bolt B1 is fastened, by the fixing frame 9. This also makes it possible to make the bottom frame 2 thinner while ensuring the durability of the bottom frame 2 (housing 1) against the load applied when the tension bolt B is fastened.

[0051] Furthermore, since the fastening portions 70 are provided on the outer periphery (at positions aligned in the radial direction) of the radial portion 21 where the recesses 24a to 24c are formed, the load generated when the tension bolt B1 is fastened can be received in an area of ​​the bottom frame 2 where the rigidity is relatively high. Therefore, the durability of the bottom frame 2 (housing 1) against the load generated when the tension bolt B is fastened can be ensured while making the bottom frame 2 thinner.

[0052] Furthermore, the lugs 7 (lower surface portion 71 and fixed portion 72) are fitted into the recesses 24b, 24c formed on the lower surface of the bottom frame 2 (housing 1), so that the rigidity of the bottom frame 2 (housing 1) around the fixed portion 72 can be effectively improved by the recesses 24b, 24c. Furthermore, by fitting the lugs 7 into the recesses 24b, 24c, steps occurring on the lower surface side of the bottom frame 2 can be filled with the lugs 7, so that the appearance of the percussion instrument 100 can be improved.

[0053] As described above, the bottom frame 2 and the reinforcing frame 9 are fastened together to the lug 7 by the fixing bolt B2, while the bottom frame 2 and the top frame 3 are screwed to the reinforcing frame 9 by the fixing bolts B3 and B4.

[0054] Specifically, a pair of female threaded holes 94, 95 aligned in the radial direction are formed between the through holes 92, 93 of the reinforcing frame 9. A through hole 27 is formed in the radiation portion 21 of the bottom frame 2 at a position corresponding to the female threaded hole 94, and a through hole 32 (see FIG. 4(a)) is formed in the support portion 31 (annular portion 31c described later) of the top frame 3 at a position corresponding to the female threaded hole 95.

[0055] A fixing bolt B3 inserted into the through hole 27 from the lower side of the bottom frame 2 (radiating portion 21) is fastened to the female threaded hole 94 of the reinforcing frame 9, and a fixing bolt B4 inserted into the through hole 32 from the upper side of the top frame 3 (support portion 31) is fastened to the female threaded hole 95. These fixing bolts B3, B4 are aligned in the radial direction together with the pair of fixing bolts B2. This effectively reinforces the housing 1 consisting of the bottom frame 2, the top frame 3, and the reinforcing frame 9 in the vicinity of the fixing bolt B2 where the load applied when the tension bolt B1 is fastened acts most. This ensures the durability of the housing 1 against the load applied when the tension bolt B1 is fastened while making the housing 1 thinner.

[0056] In this manner, in this embodiment, the bottom frame 2 and the top frame 3 are screwed to the reinforcing frame 9 formed using a metal plate, so that the function of ensuring the rigidity of the housing 1 can be mainly assigned to the reinforcing frame 9, and accordingly the thicknesses of the bottom frame 2 and the top frame 3 can be reduced. Therefore, the housing 1 can be made thinner while ensuring its rigidity.

[0057] Next, a configuration in which the head sensor 10 and the rim sensor 11 detect vibrations generated when the head 4 and the rim 5 are struck will be described with reference to Figures 3 to 5. Figure 5 is a partially enlarged cross-sectional view of the percussion instrument 100 taken along line VV in Figure 3. Note that Figure 5 illustrates a cut end surface of the percussion instrument 100 cut along a plane including the axis of the body 30 and the protrusion 29, and also illustrates a single first connection portion 31b (see Figure 3) located behind the cut surface (on the far side in the direction perpendicular to the paper surface).

[0058] First, we will explain the impact on the rim 5. As shown in Fig. 4(a), the rim 5 is supported above the body 30 of the top frame 3 via the head 4, so that the vibration generated when the rim 5 is impacted is transmitted mainly via the body 30 to the support part 31.

[0059] In the following explanation, the portion of the plate-shaped support portion 31 that supports the rim sensor 11 in the region including the axis of the body portion 30 is referred to as the central portion 31a, the portion extending radially from the central portion 31a is referred to as the first connecting portion 31b, and the portion that connects the outer edges of multiple (six in this embodiment) first connecting portions 31b arranged circumferentially in a circular manner is referred to as the annular portion 31c (see Figure 3).

[0060] The first connection portion 31b connects the central portion 31a and the annular portion 31c of the top frame 3 along the radial direction (straight line), and vibrations generated when the rim 5 is struck are transmitted to the rim sensor 11 via the body portion 30, the annular portion 31c, the first connection portion 31b, and the central portion 31a. The rim sensor 11 is a disc-shaped piezoelectric element, and is adhered to the central portion 31a via cushioned double-sided tape (see FIG. 5).

[0061] When vibration is detected by the rim sensor 11, a musical sound signal based on the detection result is generated by a sound source (not shown), and the musical sound signal is output to an amplifier and a speaker (neither of which are shown), causing electronic musical sounds to be emitted from the speaker (the same applies to the head sensor 10 described below).

[0062] The support part 31 (a frame composed of a central part 31a, a first connection part 31b, and annular part 31c) that supports the rim sensor 11 is connected to the body part 30 (via the annular part 31c) over its entire circumferential direction. This makes it possible for vibrations caused by an impact to be easily transmitted to the rim sensor 11 in the central part 31a via the first connection part 31b, regardless of where in the circumferential direction the rim 5 is struck.

[0063] Furthermore, the support structure of the head sensor 10 by the bottom frame 2 (see FIG. 5) will be described in detail later, but the bottom frame 2 that supports the head sensor 10 and the top frame 3 that supports the rim sensor 11 are separate components. This prevents the head sensor 10 from erroneously detecting vibrations when the rim 5 is struck, and prevents the rim sensor 11 from erroneously detecting vibrations when the head 4 is struck, thereby improving the accuracy of detecting strikes on the rim 5.

[0064] In addition, since the first connection parts 31b connecting the body part 30 (annular part 31c) and the central part 31a are arranged in a plurality of rows in the circumferential direction, through holes are formed between the first connection parts 31b. By forming such through holes, it is possible to suppress the vibration generated when the head 4 is struck from reverberating in the support part 31. Furthermore, by forming through holes between the first connection parts 31b of the support part 31 and also forming the sound emission hole 23 in the bottom frame 2, it becomes easier for the vibration generated when the head 4 is struck to be released to the outside through the through holes in the support part 31 and the sound emission hole 23 in the bottom frame 2. Therefore, it is possible to reduce the volume of sound generated when the head 4 is struck.

[0065] Furthermore, because the body 30 is integrally formed with the support part 31 including the first connection part 31b, vibrations generated when the rim 5 is struck are easily transmitted from the body 30 to the first connection part 31b. This makes it easier for the rim sensor 11 in the central part 31a to detect vibrations generated when the rim 5 is struck, improving the accuracy of detecting a strike on the rim 5.

[0066] As described above, the bottom frame 2 is screwed to the underside of the top frame 3 via the reinforcing frame 9 (by the fixing bolts B2 to B4), but it is also possible to screw the bottom frame 2 and the reinforcing frame 9 to the first connecting portion 31b, for example. However, if the bottom frame 2 and the reinforcing frame 9 are screwed to the first connecting portion 31b, the vibration (deflection) of the first connecting portion 31b will be hindered by the screwed portion.

[0067] In contrast, in this embodiment, the bottom frame 2 and the reinforcing frame 9 are screwed (by the fixing bolts B4) to the underside of the top frame 3 on the outer circumferential side of the first connection portion 31b, so that the screwed portion is prevented from impeding the vibration of the first connection portion 31b. Therefore, the first connection portion 31b is more likely to vibrate when the rim 5 is struck, and therefore the vibration when the rim 5 is struck is more likely to be detected by the rim sensor 11.

[0068] It is also possible to omit the reinforcing frame 9 and screw the top frame 3 directly to the bottom frame 202, as in a percussion instrument 200 of a second embodiment (see FIG. 6) described later, but a structure in which the resin frames 202, 3 are screwed together reduces the rigidity of the screwed portions. If the rigidity of these screwed portions is low, the bottom frame 2 is more likely to vibrate due to the impact of a strike on the rim 5, and the vibrations are damped by the screwed portions, which have low rigidity, and therefore the vibrations generated when the rim 5 is struck cannot be efficiently transmitted to the rim sensor 11 via the first connection portion 31b.

[0069] In contrast, in this embodiment, the reinforcing frame 9, which is harder than the bottom frame 2 and the top frame 3, is screwed between the bottom frame 2 and the top frame 3, which increases the rigidity of the connecting portions of the frames 2, 3, and 9. This makes it possible to prevent the bottom frame 2 from vibrating due to the impact of a strike on the rim 5, and to prevent the vibration from being attenuated at the connecting portions of the frames 2, 3, and 9. Therefore, the vibration caused when the rim 5 is struck can be efficiently transmitted to the rim sensor 11 via the first connection portion 31b.

[0070] Further, a second connection portion 31d (see FIG. 3) branching off from the first connection portion 31b is formed in the support portion 31. The second connection portion 31d extends linearly at an inclined angle with respect to the radial direction, and connects a substantially central portion of the first connection portion 31b (a portion closer to the center than both ends of the first connection portion 31b in the radial direction) to the annular portion 31c by the second connection portion 31d.

[0071] In this way, by connecting the second connection portion 31d branching off from the first connection portion 31b on the outer circumferential side of the central portion 31a to the body portion 30 (annular portion 31c), the vibration transmission path connecting the body portion 30 to the first connection portion 31b can be increased by the second connection portion 31d. Therefore, vibrations generated when the rim 5 is struck are more easily transmitted to the rim sensor 11, improving the accuracy of detecting a strike on the rim 5.

[0072] In this embodiment, the two second connection portions 31d are symmetrical with respect to each of the first connection portions 31b arranged in the circumferential direction with respect to the first connection portion 31b. That is, in top view, the two second connection portions 31d are symmetrical with respect to a straight line along the radial direction (first connection portions 31b) as the axis of symmetry, but the two second connection portions 31d may be formed asymmetrically.

[0073] The second connection portions 31d are formed on both circumferential sides of each first connection portion 31b (two second connection portions 31d branch off from each first connection portion 31b), so that in the circumferential direction of the top frame 3, there are regions where the first connection portions 31b and the second connection portions 31d are adjacent to each other, and regions where the second connection portions 31d are adjacent to each other.

[0074] The second connection portions 31d adjacent to each other in the circumferential direction are connected to each other in the circumferential direction by the third connection portion 31e. The third connection portion 31e extends in an arc shape along the circumferential direction and connects approximately central portions of the second connection portions 31d (portions closer to the center than both ends of the second connection portions 31d in the radial direction).

[0075] By connecting the second connection portions 31d adjacent to each other in the circumferential direction with the third connection portion 31e, the vibration transmission path connecting the body portion 30 to the first connection portion 31b can be further increased by the third connection portion 31e. Therefore, vibrations generated when the rim 5 is struck are more easily transmitted to the rim sensor 11, improving the accuracy of detecting a strike on the rim 5.

[0076] Each of the first connection parts 31b arranged in the circumferential direction is formed at a position overlapping with the sound emission hole 23 (see FIG. 3) of the bottom frame 2 in the up-down direction. That is, although not shown, when the bottom frame 2 is viewed from below, the first connection parts 31b are arranged in an area including the circumferential center of the sound emission hole 23. On the other hand, the two second connection parts 31d branching from the first connection part 31b are arranged along the edge of the sound emission hole 23 (radiation part 21) extending in the radial direction. In this way, by forming each of the connection parts 31b, 31d in a shape corresponding to the sound emission hole 23 (radiation part 21), the appearance of the percussion instrument 100 when viewed from below can be improved.

[0077] Here, when the purpose is to increase the transmission path of vibration from the body 30 (annular portion 31c) to the central portion 31a, for example, a configuration in which one end of the second connecting portion 31d is connected to the central portion 31a instead of the first connecting portion 31b, or a configuration in which an additional connecting portion is provided to connect the third connecting portion 31e and the central portion 31a can be adopted. However, with such a configuration, although the transmission path of vibration can be increased, the number of points that restrict the vibration of the central portion 31a itself (the vertical displacement of the central portion 31a due to the bending of the first connecting portion 31b) increases. As a result, the sensitivity of the rim sensor 11 to the impact on the rim 5 is likely to decrease.

[0078] In contrast, in this embodiment, only the first connection portion 31b extending in the radial direction is connected to the central portion 31a. This reduces the number of points that restrict the vibration of the central portion 31a itself, while forming a large number of vibration transmission paths in the vicinity of the body portion 30 (annular portion 31c). This improves the sensitivity of the rim sensor 11 to impacts on the rim 5.

[0079] Next, the impact on the head 4 will be described, but first the support structure of the head sensor 10 will be described. As described above, the recesses 24a to 24c are formed on the bottom surface 21a of the radiation portion 21 of the bottom frame 2, and with the formation of these recesses 24a to 24c, a protrusion is formed on the upper surface side of the radiation portion 21. In the following explanation, the configuration of the protrusion 28 corresponding to the recess 24a will be described.

[0080] 4 and 5, in the region where the recess 24a is formed, the radiation portion 21 is formed in a plate shape of approximately constant thickness, and therefore a protrusion 28 corresponding to the recess 24a is formed on the upper surface side of the radiation portion 21. More specifically, the radiation portion 21 includes a first plate 21b whose lower surface is the bottom surface of the recess 24a (whose upper surface is the upper surface of the protrusion 28), and a pair of second plates 21c extend downward from both ends of the first plate 21b in the circumferential direction (left and right direction in FIG. 4(b)). The inner edge (the end on the right side in FIG. 4(a)) of the space surrounded by the first plate 21b and the second plate 21c is closed by a third plate 21d, and the recess 24a is formed by these first to third plates 21b to 21d.

[0081] A pair of fourth plates 21e (see FIG. 4(b)) extend radially outward (away from each other) from the lower ends of the pair of second plates 21c, and a fifth plate 21f extends upward from the radially outer ends (opposite the second plates 21c) of the pair of fourth plates 21e. The fourth plate 21e is a portion that constitutes the bottom surface 21a of the radiation portion 21, and the fifth plate 21f is a portion that constitutes the side surface of the radiation portion 21 that faces the circumferential direction.

[0082] In this manner, as the recess 24a is formed by the first to third plates 21b to 21d of the radiating portion 21, a protrusion 28 is formed on the upper surface side of the radiating portion 21, and a pair of protrusions 29 standing up like columns are integrally formed on the upper surface of this protrusion 28 (see Figures 3 and 5).

[0083] As shown in FIG. 5, the protrusion 29 passes between each of the first connection portions 31b (portions located more inward than the second connection portions 31d) and protrudes upward beyond the first connection portions 31b, and the head sensor 10 is attached to the upper surface of this protrusion 29 via the plate 12.

[0084] In this manner, in this embodiment, the head sensor 10 is attached to the protrusions 29 extending upward from the top frame 3 through between the first connection portions 31b. This makes it possible to place the top frame 3 on top of the bottom frame 2 supporting the head sensor 10 (connecting the support portion 31 supporting the rim sensor 11 to the body portion 30 above the bottom frame 2) while allowing the head sensor 10 to come into contact with the head 4.

[0085] By overlapping the top frame 3 supporting the rim sensor 11 on the bottom frame 2 supporting the head sensor 10, the vibration transmission path from the rim 5 to the rim sensor 11 can be shortened, while the vibration transmission path from the rim 5 to the head sensor 10 can be lengthened. This makes it easier for the rim sensor 11 to detect vibrations when the rim 5 is struck, while also preventing erroneous detection by the head sensor 10 of vibrations when the rim 5 is struck. This allows strikes on the rim 5 to be detected with high accuracy.

[0086] The pair of protrusions 29 are aligned in the radial direction, and if a pair of protrusions 29 is considered as one set, a total of four sets of protrusions 29 are provided at equal intervals in the circumferential direction (see FIG. 3). That is, in this embodiment, vibrations generated when the head 4 is struck are detected by the four head sensors 10.

[0087] A threaded hole 29a is formed in each of the pair of protrusions 29, and a through hole 12a is formed in the plate 12 at a position corresponding to the threaded hole 29a. The plate 12 is fixed (supported) on the upper surface of the protrusion 29 by fastening a fixing bolt B5 inserted into the through hole 12a to the threaded hole 29a of the protrusion 29.

[0088] A disk-shaped sensor 10b (piezoelectric element) is attached to the upper surface of the plate 12 with a cushioning double-sided tape 10a, and a cushion 10c is attached to the upper surface of the sensor 10b. The head sensor 10 is composed of the double-sided tape 10a, the sensor 10b, and the cushion 10c.

[0089] The cushion 10c is a truncated cone-shaped buffer material made of a flexible material such as sponge, rubber, or thermoplastic elastomer.

[0090] The plate 12 is a generally rectangular (or generally elliptical) plate whose radial dimension (longitudinal direction) is larger than its circumferential dimension (width direction), and one end side in the longitudinal direction (hereinafter referred to as the “base end side”) is supported by the protrusion 29. On the other hand, the other end side in the longitudinal direction (hereinafter referred to as the “tip side”) of the plate 12 is not supported by the bottom frame 2.

[0091] That is, since the head sensor 10 is supported in a cantilevered state by the plate 12, the plate 12 is deformed so as to bend when the head 4 is struck in the vicinity of directly above the cushion 10c. This bending of the plate 12 can absorb the impact when the head 4 is struck, so that it is possible to prevent the output value of the sensor 10b from becoming extremely large (the occurrence of a so-called hot spot) when the vicinity of directly above the head sensor 10 (cushion 10c) is struck. This makes it possible to prevent variation in the sensitivity of the sensor 10b between the striking surface area close to directly above the head sensor 10 and the striking surface area far from the head sensor 10. Therefore, it is possible to uniform the sensitivity distribution of the head sensor 10 to strikes on the head 4.

[0092] Here, for example, if the plate 12 (head sensor 10) is configured to be cantilevered in an area of ​​the bottom frame 2 with relatively low rigidity, the impact caused by a strike directly above the head sensor 10 is also easily absorbed by the bending of the bottom frame 2. In such a configuration, an error in the thickness (rigidity) of the bottom frame 2 during molding may cause the bottom frame 2 to bend more than necessary, resulting in excessive absorption of the striking force, which may easily cause an error in the sensitivity of the head sensor 10 (making it difficult to obtain the desired output value).

[0093] In contrast, in this embodiment, a recess 24a is formed on the lower surface of the bottom frame 2 (radiating portion 21), thereby increasing the rigidity of the portion supporting the head sensor 10. That is, a protrusion 28 having a shape corresponding to the recess 24a is formed on the upper surface side of the bottom frame 2 (radiating portion 21), and the plate 12 is attached to a protrusion 29 provided on this protrusion 28, so that the head sensor 10 is supported in an area of ​​the bottom frame 2 that has a relatively high rigidity. This makes it possible to prevent the bottom frame 2 (protrusion 28) from bending due to the impact of a strike near directly above the head sensor 10.

[0094] Moreover, since the plate 12 is fixed to a pair of protrusions 29 aligned along the longitudinal direction of the plate 12, the rigidity of the bottom frame 2 (protrusion 28) can also be improved by the pair of protrusions 29. Therefore, it is possible to prevent the bottom frame 2 (protrusion 28) from being deflected by the impact of hitting directly above the head sensor 10.

[0095] Furthermore, of the pair of protrusions 29 aligned in the radial direction, the protrusion 29 located on the center side of the bottom frame 2 is formed at a position overlapping in the vertical direction with the third plate 21d constituting the inner circumferential surface of the protrusion 28. Although not shown, the pair of protrusions 29 are formed at a position overlapping in the vertical direction with the second plate 21c (see FIG. 4(b)) constituting the side surface of the protrusion 28 facing the circumferential direction. By forming the protrusions 29 directly above the second plate 21c and the third plate 21d, it is possible to effectively prevent the bottom frame 2 (protrusion 28) from being deflected by the impact of hitting directly above the head sensor 10.

[0096] In this way, by suppressing the bending of the bottom frame 2 (protrusion 28) when the area directly above the head sensor 10 is struck, the impact of such a strike is easily absorbed by only the bending of the plate 12. Therefore, errors are less likely to occur in the sensitivity of the head sensor 10 (making it difficult to obtain the desired output value), and strikes to the head 4 can be detected with high accuracy.

[0097] Furthermore, since the plate 12 is fixed to a pair of protrusions 29 aligned along the longitudinal direction of the plate 12, the plate 12 can be firmly fixed to the bottom frame 2. This allows the impact on the head 4 to be detected with high accuracy.

[0098] Here, in this embodiment, multiple head sensors 10 (four in this embodiment) are provided on the percussion instrument 100, but it is also possible, for example, to support these four head sensors 10 on one plate 12. One example of such a configuration is a configuration in which the center of the cross-shaped plate 12 is fixed to the protrusion 29, while the head sensors 10 are attached to the four tip portions of the cross-shaped plate 12. Even in this configuration, the head sensor 10 is supported at the tip portion of the plate 12 in a cantilevered state, so that strikes near directly above each head sensor 10 can be absorbed by the flexure of the plate 12.

[0099] However, in a configuration in which multiple head sensors 10 are attached to one plate 12, when any of the head sensors 10 is struck directly above, the vibration caused by the strike is transmitted to the other head sensor 10 (sensor 10b) via the plate 12. When such vibration interference occurs, the strike on the head 4 cannot be detected with high accuracy.

[0100] In contrast, in this embodiment, one head sensor 10 is attached to the tip side of one plate 12. As a result, when a strike is applied to the vicinity directly above any one of the multiple head sensors 10, it is possible to prevent the vibration caused by the strike from being transmitted to the other head sensors 10 (sensor 10b). As a result, it is possible to accurately detect a strike on the head 4.

[0101] In addition, since the base end side in the longitudinal direction of the plate 12 is fixed to the bottom frame 2, while the head sensor 10 is supported on the upper surface of the tip side of the plate 12, the plate 12 is easily bent when the head 4 is struck in the vicinity of directly above the cushion 10c. This makes it easier to absorb the impact when the head 4 is struck, and effectively suppresses the vibration caused by the strike from being transmitted to other head sensors 10 via the plate 12 and the bottom frame 2.

[0102] In this way, the vibrations generated when the head 4 is struck are detected by the head sensor 10, and the strength (velocity) and strike position of the strike are calculated based on the sum of the output values ​​of each head sensor 10. Examples of methods for calculating this sum include a configuration in which the sum is the sum of the peak values ​​of the output waveforms of each head sensor 10 (or the average value obtained by dividing this value by the number of sensors), or a configuration in which the output waveforms of each head sensor 10 are combined and the peak value of the combined waveform is used as the sum.

[0103] When calculating the strength of the impact on the head 4 or the impact value based on the magnitude of the sum of the output values ​​of the head sensors 10, it is preferable to place the head sensors 10 as close as possible to each other. This is because the closer the head sensors 10 are, the less likely it is that differences will occur in the output values ​​(phase and peak value of the output waveform) of the head sensors 10 when the head 4 is impacted.

[0104] Therefore, in this embodiment, the four head sensors 10 are cantilevered and positioned as close as possible by butting the tips of the four plates 12 together and facing the center of the bottom frame 2. The head sensors 10 are connected in series on a circuit board (not shown), and the output waveforms of the head sensors 10 are synthesized, and the strength and position of the impact on the head 4 are calculated based on the magnitude of the peak value of the synthesized waveform (the sum of the output values ​​of the head sensors 10).

[0105] By using the combined output value of each head sensor 10, even if the output value of any one of the head sensors 10 becomes extremely large, the large output value is leveled out by the output values ​​of the other head sensors 10, so that the strength and position of the impact on the head 4 can be calculated with high accuracy.

[0106] Next, a percussion instrument 200 according to a second embodiment will be described with reference to Fig. 6. The same parts as those in the first embodiment are designated by the same reference numerals and will not be described. Fig. 6 is a partially enlarged cross-sectional view of the percussion instrument 200 according to the second embodiment. Note that Fig. 6 illustrates the cut end surface of the percussion instrument 200, but also illustrates a schematic diagram of one first connection portion 31b located behind the cut surface (in the direction perpendicular to the paper).

[0107] As shown in FIG. 6, in a housing 201 of a percussion instrument 200 of the second embodiment, the reinforcing frame 9 of the first embodiment is omitted, and a top frame 3 is directly placed on a bottom frame 202.

[0108] A threaded hole 220 is formed in the bottom frame 202 at a position corresponding to the through hole 32 of the top frame 3, and the top frame 3 is fixed to the bottom frame 202 by fastening a fixing bolt B4 inserted into the through hole 32 to the threaded hole 220.

[0109] A fastening portion 221 corresponding to the lug 7 (see FIG. 2) having the fastening portion 70, the lower surface portion 71, the fixing portion 72, etc. of the first embodiment is integrally formed on the lower surface of the bottom frame 202. Of the recesses 24a to 24c (see FIG. 2) described in the first embodiment, the recesses 24b and 24c are filled by the fastening portion 221, while the recess 24a is formed on the inner side (the right side in FIG. 6) of the fastening portion 221.

[0110] Although not shown, the percussion instrument 200 of this embodiment also has a plurality of radiating parts 21 (see FIG. 2) arranged in the circumferential direction similar to the first embodiment, and a recess 24a is formed on the lower surface of the radiating part 21. This makes it possible to eliminate the need to form ribs on the radiating part 21 or to reduce the number of ribs to be formed, while ensuring the rigidity of the bottom frame 202 (radiating part 21) by the recess 24a. Therefore, even if the bottom frame 202 is molded from resin, it is possible to suppress the occurrence of sink marks in the radiating part 21, and the appearance of the percussion instrument 200 can be improved while reinforcing the bottom frame 202 by the recess 24a. In addition, since the recess 24a is formed in the shape of a single groove that is continuous in the radial direction, the rigidity of the bottom frame 202 can be ensured while improving the appearance of the percussion instrument 100.

[0111] The fastening portion 221 is formed with a female threaded hole 222 for fastening the tension bolt B1, and this female threaded hole 222 is formed on the outer circumferential side of the recess 24a (at a position aligned radially with the recess 24a). By providing the fastening portion 221 (female threaded hole 222) to which the tension bolt B1 is fastened on the outer circumferential side of the radial portion 21 in which the recess 24a is formed, the load applied when the tension bolt B1 is fastened can be received in an area with high rigidity. Therefore, the bottom frame 202 (housing 201) can be made thinner while ensuring the durability of the bottom frame 202 against the load applied when the tension bolt B1 is fastened.

[0112] 6, one first connection portion 31b is illustrated, but multiple first connection portions 31b are arranged in the circumferential direction, as in the first embodiment. This makes it easier for vibrations caused by an impact to be transmitted to the rim sensor 11 in the central portion 31a via the first connection portion 31b, regardless of where the rim 5 is struck in the circumferential direction. In addition, the bottom frame 202 supporting the head sensor 10 and the top frame 3 supporting the rim sensor 11 are separate components. This makes it possible to prevent an impact on the rim 5 from being erroneously detected by the head sensor 10, and to prevent an impact on the head 4 from being erroneously detected by the rim sensor 11, thereby improving the detection accuracy of an impact on the rim 5.

[0113] Also in this embodiment, the head sensor 10 (sensor 10b and cushion 10c) is attached to the tip side of the plate 12 supported in a cantilevered state by the bottom frame 202, so that the impact when the head 4 is struck can be absorbed by the flexure of the plate 12. This makes it possible to prevent the output value of the sensor 10b from becoming extremely large when the head sensor 10 (cushion 10c) is struck directly above it. This makes it possible to uniformize the sensitivity distribution of the head sensor 10 to strikes on the head 4.

[0114] As described above, the recess 24a is provided on the lower surface of the bottom frame 202 (radiating portion 21), and therefore the protrusion 28 corresponding to the recess 24a is formed on the upper surface side of the bottom frame 202 (radiating portion 21). The plate 12 is attached to the protrusion 28 with increased rigidity via the protrusion 29, so that it is possible to prevent the bottom frame 202 (protrusion 28) from bending due to the impact of a strike directly above the head sensor 10. By preventing the bottom frame 202 (protrusion 28) from bending, the impact of a strike directly above the head sensor 10 is easily absorbed by the bending of the plate 12 alone, and therefore the strike on the head 4 can be detected with high accuracy.

[0115] Next, a percussion instrument 300 according to a third embodiment will be described with reference to Figures 7 and 8. The same parts as those in the above-mentioned embodiments are given the same reference numerals and their description will be omitted. Figure 7 is a perspective view of the percussion instrument 300 according to the third embodiment, and Figure 8 is an enlarged partial cross-sectional view of the percussion instrument 300 taken along line VIII-VIII in Figure 7. Note that Figure 7 shows the percussion instrument with the head 4 (see Figure 8) removed.

[0116] As shown in Figures 7 and 8, the percussion instrument 300 of the third embodiment has a cylindrical shell 301 (body) that forms its housing part, and the opening portion at the axial end of this shell 301 is covered by a head 4 (see Figure 8).

[0117] The head 4 is attached to the shell 301 by an annular hoop 306. The hoop 306 has through holes 360 (see FIG. 8) formed at multiple locations in the circumferential direction, and tension bolts B1 are inserted into the through holes 360. A plurality of lugs 307 are fixed to the outer circumferential surface of the shell 301 by fixing bolts B6, and tension is applied to the head 4 by fastening the tension bolts B1 into female threaded holes 370 of the lugs 307 with the head frame 40 hooked onto the hoop 306.

[0118] A first frame 302 that supports the head sensor 10 and a second frame 303 that supports the rim sensor 11 are fixed to the inner periphery side of the shell 301. The first frame 302 is composed of a mounting frame 320 to which the head sensor 10 is attached, and a fixing bracket 321 for fixing the mounting frame 320 to the inner periphery surface of the shell 301.

[0119] Fixing bracket 321 is an L-shaped metal fitting that is screwed to the inner peripheral surface of shell 301, and mounting frame 320 is a resin frame that extends in the radial direction of shell 301. Mounting frame 320 is formed in the shape of a channel steel having webs and flanges, and both longitudinal ends of mounting frame 320 are bent downward and fixed (screwed) to fixing bracket 321.

[0120] A rib 320a is integrally formed at the widthwise center of the mounting frame 320. The rib 320a is formed in a plate shape extending in the longitudinal direction (radial direction) of the mounting frame 320, and the rigidity of the mounting frame 320 can be improved by this rib 320a.

[0121] A pair of columnar projections 320b aligned in the longitudinal direction are integrally formed on the mounting frame 320, and the plate 312 is fixed to the pair of projections 320b. The plate 312 is formed in a substantially elliptical shape, and both ends in the longitudinal direction are screwed to the pair of projections 320b. The head sensor 10 supported by the plate 312 includes a double-sided tape 10a, a sensor 10b, and a cushion 10c, similar to the first embodiment.

[0122] The second frame 303 includes a central portion 330 that supports the rim sensor 11, and a connecting portion 331 that extends radially from the central portion 330 and is connected to the inner peripheral surface of the shell 301, and these portions 330, 331 are integrally formed using a resin material. The outer edge portion of the connecting portion 331 is screwed to the inner peripheral surface of the shell 301 by fixing bolts B6.

[0123] A ring-shaped rubber rim cover 305 is attached to the top of the hoop 306, and vibrations generated when the rim cover 305 is struck are transmitted mainly via the head 4 (head frame 40) and the shell 301 to the connection part 331 of the second frame 303.

[0124] The second frame 303 supporting the rim sensor 11 is connected to the shell 301 at multiple points in the circumferential direction (via multiple connection parts 331), so no matter where in the circumferential direction the rim cover 305 is struck, the vibration caused by the strike is easily transmitted to the rim sensor 11 in the central part 330 via the connection parts 331. Also, because the first frame 302 supporting the head sensor 10 and the second frame 303 supporting the rim sensor 11 are separate parts, it is possible to prevent the head sensor 10 (rim sensor 11) from erroneously detecting the vibration caused by a strike on the rim cover 305 (head 4). This improves the accuracy of detecting a strike on the rim cover 305.

[0125] Furthermore, by arranging a plurality of (six in this embodiment) connecting portions 331 connecting the central portion 330 of the second frame 303 and the shell 301 in the circumferential direction, through holes are formed between the connecting portions 331. By forming such through holes, vibrations generated when the head 4 is struck can be easily released to the outside through the through holes. Therefore, the sound volume generated when the head 4 is struck can be reduced.

[0126] In this embodiment, the second frame 303 (connection portion 331) is connected to the shell 301 above the connection position (the fixed position of the fixing metal fitting 321 to the shell 301) between the shell 301 and the first frame 302. This makes it possible to shorten the vibration transmission path from the rim cover 305 to the rim sensor 11, while lengthening the vibration transmission path from the rim cover 305 to the head sensor 10.

[0127] The first frame 302 includes a mounting frame 320 that extends from the lower side of the second frame 303 to the upper side of the second frame 303 through the connecting portions 331 and to which the head sensor 10 is attached. This makes it possible to position the connection position between the shell 301 and the second frame 303 above the connection position between the shell 301 and the first frame 302, while allowing the head sensor 10 to come into contact with the head 4.

[0128] As described above, vibrations caused when the rim cover 305 is struck are mainly transmitted to the second frame 303 via the head 4 (head frame 40) and the shell 301, but some vibrations are also transmitted to the shell 301 via the tension bolt B1 and the lug 307. In this embodiment, the connection portion 331 of the second frame 303 and the shell 301 are fastened together to the lug 307 by the fixing bolt B6 (see FIG. 8). This makes it easier for vibrations transmitted to the shell 301 via the tension bolt B1 and the lug 307 when the rim cover 305 is struck to be transmitted to the rim sensor 11 via the connection portion 331, thereby improving the accuracy of detecting an impact on the rim cover 305.

[0129] The above has been explained based on the above embodiment, however, the present invention is in no way limited to the above embodiment, and it can be easily inferred that various improvements and modifications are possible within the scope that does not deviate from the spirit of the present invention.

[0130] In the above-mentioned embodiments, the percussion instruments 100, 200, 300 are described as electronic percussion instruments, but the present invention is not limited to this. For example, the configuration in which the fixing portion 72 extending inward from the fastening portion 70 of the lug 7 is fixed to the lower surface of the bottom frame 2 (housing 1), and the configuration in which the recesses 24a to 24c are formed on the lower surface of the radiating portion 21 extending radially from the central portion 20 of the bottom frame 2 (bottom of the housing 1) can also be applied to acoustic percussion instruments (drums).

[0131] In each of the above embodiments, the case has been described in which the connection position between the torso (the torso 30 and the shell 301) and the frame supporting the head sensor 10 (the bottom frame 2, 202 and the second frame 303) is located above the connection position between the torso (the torso 30 and the shell 301) and the frame supporting the rim sensor 11 (the support 31 and the first frame 302), but this is not necessarily limited to this. For example, a configuration in which the relationship of such connection positions is reversed is also acceptable.

[0132] As an example of such a configuration, in the first and second embodiments, a configuration is exemplified in which the head sensor 10 attached to the support portion 31 (center portion 31a) is brought into contact with the head 4, while the rim sensor 11 is attached to the bottom frame 2, 202. As another example, in the third embodiment, a configuration is exemplified in which the fixing metal fitting 321 is fixed to the inner circumferential surface of the shell 301 above the connection position between the shell 301 and the connection portion 331.

[0133] In the above first and second embodiments, the recesses 24a are formed in the shape of a groove that continues in the radial direction, but this is not necessarily limited to this. For example, a configuration in which a rib (a plate-shaped wall extending in the circumferential direction) that divides the recesses 24a is formed, that is, a configuration in which a plurality of recesses that are intermittently arranged in the radial direction are formed on the lower surface of the bottom frame 2, 202 (radiating portion 21) may be used.

[0134] In the above first and second embodiments, the fastening parts 70, 221 to which the tension bolt B1 is fastened are provided on the outer periphery of the recesses 24a-24c (radiation part 21), but this is not necessarily limited to this. For example, the fastening parts 70, 221 may be provided on the outer periphery of the sound emission hole 23 (at a position aligned radially with the sound emission hole 23).

[0135] In the above first and second embodiments, the protrusion 29 is provided on the convex portion 28 formed on the upper surface side of the bottom frame 2, 202, and the head sensor 10 is attached to the protrusion 29, but this is not necessarily limited to this. For example, the protrusion 29 may be formed in a portion of the bottom frame 2, 202 where the protrusion 28 is not formed (for example, the central portion 20).

[0136] In the above first and second embodiments, a portion is formed in which the width dimension of the radiation portion 21 gradually becomes smaller or larger toward the outer periphery, and the width dimensions of the recesses 24a, 24b are gradually made smaller or larger toward the outer periphery in response to the width dimension of the radiation portion 21, but this is not necessarily limited to the above. For example, the width dimension of either the radiation portion 21 or one (or both) of the recesses 24a, 24b may be constant from the inner periphery to the outer periphery. That is, the width dimensions (shapes) of the radiation portion 21 and the recesses 24a, 24b can be set appropriately.

[0137] In the above first and second embodiments, the support portion 31 to which the rim sensor 11 is attached is connected to the body portion 30 (via the annular portion 31c) over the entire circumferential direction, but this is not necessarily limited to this. For example, the annular portion 31c may be omitted, and the first connection portion 31b may be directly connected to the body portion 30. Even in this configuration, no matter where in the circumferential direction the rim 5 is struck, vibrations caused by the strike are easily transmitted to the rim sensor 11 in the central portion 31a via the first connection portion 31b.

[0138] In the above first and second embodiments, a case where a plurality of through holes are formed between the connecting parts 31b, 31d, and 31e has been described, but this is not necessarily limited to this. For example, the through holes between the connecting parts 31b, 31d, and 31e may be omitted, and the support part 31 may be a single plate-shaped frame. In this case, the support part 31 may support the head sensor 10 and bring it into contact with the head 4, while the bottom frame 2 may support the rim sensor 11. Even in this configuration, the bottom frame 2 supporting the rim sensor 11 is connected to the body part 30 (through the reinforcing frame 9) over its entire circumference in the circumferential direction, so that vibrations caused by the strike are easily transmitted to the rim sensor 11 no matter where the rim 5 is struck in the circumferential direction.

[0139] In the above first and second embodiments, the support portion 31 that supports the rim sensor 11 is formed integrally with the body portion 30. However, the body portion 30 and the support portion 31 may be separate components.

[0140] In the above first and second embodiments, the trunk portion 30 (annular portion 31c) and the first connecting portion 31b are connected by the second connecting portion 31d, and the second connecting portions 31d adjacent to each other in the circumferential direction are connected by the third connecting portion 31e. However, this is not necessarily limited to this. For example, some or all of the second connecting portions 31d and the third connecting portion 31e may be omitted, or the annular portion 31c may be omitted and the first connecting portion 31b may be directly connected to the trunk portion 30.

[0141] Furthermore, when the second connection portion 31d is omitted, a connection portion (fourth connection portion) that connects the first connection portions 31b adjacent to each other in the circumferential direction may be provided. With such a configuration, the number of points that restrict the bending of the first connection portions 31b is reduced, and the first connection portions 31b lined up in the circumferential direction are more likely to bend together, so that vibrations generated when the rim 5 is struck are more easily transmitted to the rim sensor 11.

[0142] Also, a portion connecting the first connecting portion 31b and the second connecting portion 31d, and a portion connecting the central portion 31a and the second connecting portion 31d may be provided. Also, a portion connecting the central portion 31a and the third connecting portion 31e, and a portion connecting the third connecting portion 31e and the annular portion 31c may be provided.

[0143] In the above first and second embodiments, the sections 31a to 31e of the support section 31 are integrally formed. However, some or all of these sections 31a to 31e may be formed separately from the other sections.

[0144] In the above first and second embodiments, the first connection parts 31b are located above the sound emitting holes 23, and the second connection parts 31d are arranged along the edges of the sound emitting holes 23 (radiation part 21). However, for example, the first connection parts 31b and the second connection parts 31d may be arranged above the radiation part 21. In other words, the configuration of the support part 31 that supports the rim sensor 11 is not limited to the above-described form, and can be changed as appropriate.

[0145] In the above first and second embodiments, the plate 12 is fixed to a pair of protrusions 29. However, the present invention is not limited to this. For example, the plate may be fixed to one or three or more protrusions 29.

[0146] In the above first and second embodiments, a case has been described in which a plurality of head sensors 10 are provided, with one head sensor 10 attached to the tip side of one plate 12, but this is not necessarily limited to this. For example, the number of head sensors 10 may be one or more. Also, the plate 12 may be formed in a circular or polygonal shape according to the number of head sensors 10, and a plurality of head sensors 10 may be supported on the single plate 12.

[0147] One example of such a configuration is one in which the central portion of plate 12 formed in a circular or polygonal (e.g., cross) shape is fixed to protrusion 29, while head sensor 10 is attached to a portion of plate 12 closer to the outer edge than the fixed portion (a tip portion that protrudes from the fixed portion and is in a cantilevered state). With such a configuration, multiple head sensors 10 can be supported in a cantilevered state on plate 12 while reducing the number of parts.

[0148] In the above first and second embodiments, the leading end of each of the multiple plates 12 is directed toward the center of the bottom frame 2, but this is not necessarily limited to this. For example, the leading end of each of the plates 12 may be directed toward the outer periphery of the bottom frame 2.

[0149] In the above first embodiment, the fixing bolt B2 inserted into the bottom frame 2 (reinforcement frame 9) from above is fastened to the fixing portion 72, but this is not necessarily limited to this. For example, the fixing bolt B2 inserted from the lower side of the lug 7 may be fastened to the bottom frame 2 (reinforcement frame 9).

[0150] In the above first embodiment, a case has been described in which an annular reinforcing frame 9 made of a material harder than the bottom frame 2 is placed on top of the bottom frame 2, and the frames 2, 9 and the lugs 7 (fixing portions 72) are fastened together by the fixing bolts B2, but this is not necessarily limited to the above. For example, it is of course possible to fasten the reinforcing frame 9 and the lugs 7 to the bottom frame 2 with separate bolts. It is also possible to fasten the top frame 3, reinforcing frame 9, and bottom frame 2 together to the lugs 7 by the fixing bolts B4.

[0151] In the first embodiment, the fixing bolts B2 to B4 are arranged in a radial direction, but the fixing positions of the fixing bolts B2 to B4 may be shifted in the circumferential direction. It is also possible to omit one of the two fixing bolts B2 arranged in a radial direction, or to omit the fixing bolt B3.

[0152] When omitting one of the two fixing bolts B2 arranged in the radial direction, it is preferable to leave the fixing bolt B2 located on the inner circumference side (the right side of FIG. 4(a)) (omit the fixing bolt B2 on the outer circumference side). This is because the load acting on the fixing bolt B2 on the inner circumference side, which is relatively far from the contact point P, when the tension bolt B1 is fastened is relatively small.

[0153] In the first embodiment, the bottom frame 2 and the reinforcing frame 9 are screwed to the underside of the top frame 3 (annular portion 31c) on the outer circumferential side of the first connecting portion 31b, but the bottom frame 2 and the reinforcing frame 9 may be screwed to the first connecting portion 31b or the second connecting portion 31d, for example. In other words, the fixing structure between the frames 2, 3, 9 and between the lugs 7 is not limited to the above embodiment and can be changed as appropriate.

[0154] In the above first embodiment, the protruding portion 91 protrudes from the annular portion 90 of the reinforcing frame 9 to the inner circumferential side, but this is not necessarily limited to this. For example, the protruding portion 91 may be omitted, and only the annular portion 90 may be screwed to the outer circumferential portion 22 of the bottom frame 2.

[0155] In the above third embodiment, the second frame 303 supporting the rim sensor 11 is connected to the shell 301 at multiple points in the circumferential direction (through multiple connection parts 331), but this is not necessarily limited to this. For example, the through holes between the connection parts 331 may be omitted and the second frame 303 may be a single plate-shaped frame. In this case, the shell 301 and the first frame 301 may be connected to each other above the connection position between the shell 301 and the second frame 303. With this configuration, the second frame 303 can be connected to the shell 301 over its entire circumference in the circumferential direction, so that vibrations caused by the impact are easily transmitted to the rim sensor 11 via the second frame 303, regardless of which position in the circumferential direction the rim cover 305 is struck. [Explanation of symbols]

[0156] 100 Percussion Instruments 1 Case 2 Bottom frame (part of the housing) 24a~24c Recess 3 Top frame (part of the housing) 30 Torso 4 Head 7 Rug 70 Fastening Part 70b aperture 70c hollow 72 Fixed part 8 Anti-loosening 80 Main body 81 Legs 9 Reinforcement frame 9 (part of the housing) B1 Tension bolt B2 Fixing bolt (first bolt) B3 Fixing bolt (second bolt) B4 Fixing bolt (third bolt)

Claims

1. a housing having a cylindrical body, a head covering an opening at an upper end side of the body, a tension bolt for pulling an outer edge of the head downward to apply tension, a lug to which the tension bolt is fastened, and a first bolt for fixing the lug to the housing, A percussion instrument characterized in that the lug has a fastening portion into which the tension bolt is fastened, and a fixing portion extending inward from the fastening portion and fixed to the underside of the housing by the first bolt.

2. 2. The percussion instrument according to claim 1, wherein the first bolt is inserted from an upper side of the housing and fastened to the fixing portion.

3. 2. The percussion instrument according to claim 1, wherein the fixing portion is fixed to the housing by a plurality of the first bolts arranged in a radial direction of the body portion.

4. the housing includes a bottom frame that constitutes a bottom of the housing and has an underside to which the fixing portion is fixed, and an annular reinforcing frame that is formed using a material harder than the bottom frame and is superimposed on the bottom frame; 2. The percussion instrument according to claim 1, wherein the bottom frame, the reinforcing frame, and the fixing portion are fastened together by the first bolt.

5. a second bolt that fastens the bottom frame to the reinforcing frame; a top frame that is overlaid on the reinforcing frame and has the body portion; and a third bolt that fastens the top frame to the reinforcing frame, 5. The percussion instrument according to claim 4, wherein the first bolt, the second bolt, and the third bolt are aligned along a radial direction of the body portion.

6. 2. The percussion instrument according to claim 1, wherein the housing has a recess extending from a center side of a lower surface of the housing to an outer edge of the housing and into which the fixing portion is fitted.

7. a body portion to which the tension bolt is fastened and a pair of legs protruding from a lower surface of the body portion; and a locking device inserted into an internal cavity of the fastening portion; An opening of the cavity is formed on the inner circumferential side of the fastening portion, 2. The percussion instrument according to claim 1, wherein rotation of the locking member is restricted by engagement between the pair of legs and the fixing portion that extends through the opening into the cavity.

8. a housing having a cylindrical body, a head covering an opening on an upper surface side of the body, a tension bolt for pulling an outer edge of the head downward, a lug to which the tension bolt is fastened, and a first bolt for fixing the lug to the housing, a fastening portion, the fastening portion extending radially inward from the fastening portion and fixed to a bottom surface of the housing by the first bolt, A method of applying tension, comprising the steps of: applying tension to the head by fastening the tension bolt to the fastening portion.

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