Patent Publication Number: US-10777179-B2

Title: Electronic percussion instrument

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This application claims the priority benefit of Japan Application No. 2018-031630, filed on Feb. 26, 2018. The entirety of the above-mentioned patent application is hereby incorporated by reference herein and made a part of this specification. 
     BACKGROUND 
     Technical Field 
     The disclosure relates to an electronic percussion instrument, and particularly, to an electronic percussion instrument that can efficiently transmit vibration generated when a rim is struck to a rim sensor. 
     Description of Related Art 
     An electronic percussion instrument including a rim cover that protects a rim from being struck by a performer and a rim sensor configured to detect vibration generated when the rim cover is struck is known. For example, in Patent Document 1, an electronic percussion instrument including an annular outer peripheral part which is connected to a head support member of a body part and disposed on the outer circumferential side relative to a hoop and in which a rim cover is fitted to an upper end of the outer peripheral part is described. According to this electronic percussion instrument, since an upper end of the rim cover is positioned above the hoop, the hoop can be protected from being struck by the rim cover. 
     However, in this related art, the outer peripheral part to which the rim cover is fitted is formed to protrude radially outward from the head support member of the body part and extend upward, and the rim sensor configured to detect vibration generated when the outer peripheral part (rim cover) is struck is supported on the inner circumferential side of the head support member. Therefore, since vibration generated when the rim cover is struck is transmitted to the rim sensor through the outer peripheral part, there is a problem that a vibration transmission path (distance) from the rim cover to the rim sensor becomes longer and it is difficult to transmit vibration generated when the rim (rim part) is struck to the rim sensor. 
     On the other hand, the applicant proposes use of a configuration in which a rim is disposed on the inner circumferential side of a hoop in the electronic percussion instrument of the related art. Here, a configuration of an electronic percussion instrument  101  of the related art will be described with reference to  FIG. 3 .  FIG. 3  is a cross-sectional view of the electronic percussion instrument  101  of the related art. The symbol  120  ( 102 ) in  FIG. 3  means the cylindrical part  120  of the body part  102 , the other symbols marked as the same way are the same meanings. 
     The electronic percussion instrument  101  includes a body part  102  having an opening on the upper end side, a head  103  that covers the opening of the body part  102 , a hoop  104  that applies tension to the head  103 , and a rim  105  that protects the hoop  104  from being struck and is disposed on the inner circumferential side of the hoop  104 . 
     The body part  102  includes a cylindrical part  120  having a cylindrical shape of which a lower end side is blocked and a fixing part  121  that protrudes radially outward from the outer circumferential surface of the lower end side of the cylindrical part  120 . When a bolt B inserted into a through-hole of the hoop  104  is screwed into the fixing part  121 , the hoop  104  is fastened and fixed to the fixing part  121 . 
     The head  103  includes a disk-shaped film part  130  constituting a struck surface and an annular frame part  131  that is connected to the outer edge of the film part  130 . When the film part  130  is connected to the upper surface on the inner circumferential side of the frame part  131 , the upper surface on the outer circumferential side of the frame part  131  is exposed. When this exposed part is pushed downward by the hoop  104  (the hoop  104  is fastened and fixed to the fixing part  121 ), tension is applied to the film part  130 . 
     The rim  105  includes an annular struck part  150  formed with a substantially U-shaped cross section and a clamped part  151  that protrudes radially outward from the outer edge of the struck part  150  and is formed using a rubber-like elastic component. The clamped part  151  is intermittently formed in the circumferential direction of the rim  105 . When the clamped part  151  is clamped between the upper surface of the frame part  131  and the hoop  104 , the struck part  150  is fixed along the inner circumferential surface of the hoop  104 . 
     Since the upper end of the struck part  150  is positioned above the upper end of the hoop  104 , the hoop  104  can be protected from being struck by the rim  105 . In addition, since the struck part  150  is formed in a U-shaped cross section (hollow shape) using a rubber-like elastic component, it is possible to reduce a striking sound generated by striking the struck part  150 . 
     PATENT DOCUMENTS 
     [Patent Document 1] Japanese Unexamined Patent Application Publication No. 2007-249141 (for example, 0025, 0038, and 0039,  FIG. 5 ( b ) ) 
     However, the above electronic percussion instrument  101  of the related art includes a head sensor S on the inner circumferential side of the cylindrical part  120 , but it does not have a rim sensor. In addition, even if a rim sensor is supported on the cylindrical part  120  of the electronic percussion instrument  101  of the related art, it is not possible to efficiently transmit vibration generated when the rim  105  is struck to the rim sensor. 
     That is, a part on the inner circumferential side of the struck part  150  is supported on the cylindrical part  120  via the film part  130  on the outer circumferential side relative to the upper end of the cylindrical part  120 , and a part on the outer circumferential side of the struck part  150  is supported on the upper surface of the frame part  131 . Therefore, since a part of vibration generated when the rim  105  is struck is transmitted to the cylindrical part  120  through the frame part  131  and the film part  130 , it is not possible to efficiently transmit vibration generated when the rim  105  is struck to the cylindrical part  120 . 
     In addition, while a part of vibration generated when the rim  105  is struck is transmitted to the cylindrical part  120  of the body part  102  from the struck part  150  through the film part  130 , since a part on the inner circumferential side of the struck part  150  is positioned on the outer circumferential side relative to the upper end of the cylindrical part  120 , it is difficult to directly transmit vibration generated when the struck part  150  is struck to the cylindrical part  120 . In addition, since the struck part  150  is formed with a U-shaped cross section (hollow shape) using a rubber-like elastic component, the struck part  150  is easily elastically deformed by striking, and a striking force is buffered by the struck part  150 . Therefore, it is not possible to efficiently transmit vibration generated when the rim  105  is struck to the cylindrical part  120 . 
     That is, the above techniques of the related art have a problem that it is not possible to efficiently transmit vibration generated when a rim is struck to a rim sensor. 
     SUMMARY 
     An electronic percussion instrument includes: a body part having an opening on at least one end side of the body part; a head that covers the opening of the body part; a hoop for applying tension to the head, a rim which is disposed on an inner circumferential side of the hoop and of which an upper end is positioned above an upper end of the hoop and of which a bottom surface is supported on an edge of the opening of the body part via the head; and a rim sensor that detects vibration generated when the rim is struck and is disposed in the body part. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is an exploded perspective view of an electronic percussion instrument in one embodiment. 
         FIG. 2  is a cross-sectional view of the electronic percussion instrument. 
         FIG. 3  is a cross-sectional view of an electronic percussion instrument of the related art. 
     
    
    
     DESCRIPTION OF THE EMBODIMENTS 
     One of the embodiments of the disclosure provides an electronic percussion instrument that can efficiently transmit vibration generated when a rim is struck to a rim sensor. 
     Preferable embodiments will be described below with reference to the appended drawings. First, a configuration of an electronic percussion instrument  1  will be described with reference to  FIG. 1 .  FIG. 1  is an exploded perspective view of the electronic percussion instrument  1  in one embodiment. 
     As shown in  FIG. 1 , the electronic percussion instrument  1  is an electronic percussion instrument that simulates a drum, and includes a cylindrical body part  2 , a head  3  that covers an opening of the body part  2 , a hoop  4  that applies tension to the head  3 , and a rim  5  that protects the hoop  4  being struck and is clamped between the head  3  and the hoop  4 . 
     The body part  2  includes a cylindrical part  20  having a cylindrical shape of which both upper and lower ends are open, an annular fixing part  21  that protrudes radially outward from the outer circumferential surface on the lower end side of the cylindrical part  20 , a box-shaped first support part  22  which protrudes from the inner circumferential surface of the cylindrical part  20  toward the axis of the cylindrical part  20  and of which the upper end side is open, and a box-shaped second support part  23  surrounding the first support part  22  which protrudes from the inner circumferential surface of the cylindrical part  20  toward the axis of the cylindrical part  20  and of which the upper end side is open, and is formed using a resin material (in the present embodiment, glass reinforced nylon). 
     The cylindrical part  20  is a part for supporting the head  3 , and the fixing part  21  is a part for fastening and fixing the hoop  4  with a bolt B. A female screw hole  21   a  that vertically extends and has a female screw on its inner circumferential surface is formed on the upper surface of the fixing part  21 . A plurality of (in the present embodiment, 8) female screw holes  21   a  are formed at equal intervals in the circumferential direction. 
     A rim sensor S 1  and a first head sensor S 2  are supported on the first support part  22 , and a second head sensor S 3  is supported on the second support part  23 . In addition, a substrate (not shown) for processing signals detected by sensors and the like are supported on the first support part  22  and the second support part  23 . 
     The rim sensor S 1  is a sensor configured to detect vibration of the cylindrical part  20 . The rim sensor S 1  is configured as a piezoelectric element that is adhered to the bottom surface of the first support part  22  using cushioning double-sided tape. 
     The first head sensor S 2  is a sensor configured to detect vibration of striking on the struck surface edge side of the head  3  (a film part  30 ). The first head sensor S 2  includes a plate fixed to a pair of columnar parts that stand up from the bottom surface of the first support part  22 , a piezoelectric element that is adhered to the upper surface of the plate using cushioning double-sided tape, and a cushion member that is adhered to the upper surface of the piezoelectric element. 
     The second support part  23  is detachably fixed to the first support part  22  with a bolt (not shown) and extends from the inner circumferential surface of the cylindrical part  20  to a region including the axis of the cylindrical part  20 . The second head sensor S 3  is supported on the extension tip side of the second support part  23  and disposed at a position overlapping the axis of the cylindrical part  20 . 
     The second head sensor S 3  is a sensor configured to detect vibration of striking in the vicinity of the center of the struck surface of the head  3  (the film part  30 ). The second head sensor S 3  includes a plate fixed to a plurality of columnar parts that stand up from the bottom surface of the second support part  23 , a piezoelectric element that is adhered to the upper surface of the plate using cushioning double-sided tape, and a cushion member that is adhered to the upper surface of the piezoelectric element. 
     The head  3  includes the disk-shaped film part  30  whose upper surface is configured as a struck surface, an annular frame part  31  that is connected to the outer edge of the film part  30  and applies tension to the film part  30 . The film part  30  is formed using a mesh-like material obtained by knitting synthetic fibers or a synthetic resin, and the frame part  31  is formed using a metal material (or a resin material). When the frame part  31  is pressed downward by the hoop  4 , tension is applied to the film part  30 . 
     The hoop  4  includes an annular part  40  having an annular shape and a fixed part  41  that protrudes radially outward from the outer circumferential surface of the annular part  40  and is continuously formed in the circumferential direction of the annular part  40 , and is formed using a resin material (in the present embodiment, glass reinforced nylon). 
     In the fixed part  41 , a plurality of (in the present embodiment, 8) through-holes  41   a  that vertically extend are formed at equal intervals in the circumferential direction. When the bolt B inserted into the through-hole  41   a  is screwed into the female screw hole  21   a  of the fixing part  21 , the hoop  4  is fixed to the body part  2 . 
     In the annular part  40  of the hoop  4 , a housing part  40   a  recessed from its inner circumferential surface directed outward in the radial direction is formed and a clamped part  51  of the rim  5  can be housed in the housing part  40   a . The housing part  40   a  is configured as recesses with a shape (in the present embodiment, a rectangular parallelepiped) corresponding to the outer shape of the clamped part  51  and a plurality of (in the present embodiment, 16) housing parts are formed at equal intervals in the circumferential direction of the annular part  40 . 
     The rim  5  is a member for striking when a performer performs a technique simulating a rim shot and also protects the hoop  4  being struck. The rim  5  includes an annular struck part  50  and the substantially rectangular parallelepiped clamped part  51  that protrudes radially outward from the outer circumferential surface of the struck part  50  and is suspended downward and is formed using a rubber-like elastic component. 
     A plurality of (in the present embodiment, 16) clamped parts  51  are formed at equal intervals in the circumferential direction, and the clamped part  51  has recesses  51   a  recessed on the outer circumferential surface of the clamped part  51  toward an inside in the radial direction of the clamped part  51 . A plurality of (in the present embodiment, 4) recesses  51   a  are formed in the upper end part of the clamped part  51  and formed on the outer circumferential surface of the clamped part  51  in the circumferential direction. As will be described below, when the recesses  51   a  are formed in the clamped part  51 , elastic deformation of the clamped part  51  is allowed. 
     Next, a detailed configuration of the electronic percussion instrument  1  will be described with reference to  FIG. 2 .  FIG. 2  is a cross-sectional view of the electronic percussion instrument  1 . Here, a cross section cut in a plane along the axis of the cylindrical part  20  is shown in  FIG. 2 . A cross section cut at a position at which the clamped part  51  (the recesses  51   a ) of the rim  5  is formed is shown on the left side in  FIG. 2 , and a cross section cut at a position at which the bolt B is fastened is shown on the right side in  FIG. 2 . The symbol  50  ( 5 ) in  FIG. 2  means the struck part  50  of the rim  5 , the other symbols marked as the same way are the same meanings. 
     As shown in  FIG. 2 , since the inner diameter (the outer diameter of the film part  30 ) of the frame part  31  of the head  3  is set to be larger than the outer diameter of the cylindrical part  20 , when an opening of the cylindrical part  20  is covered with the film part  30 , the frame part  31  is disposed on the outer circumferential side of the cylindrical part  20 . 
     When the film part  30  is connected to the upper surface on the inner circumferential side of the frame part  31 , a part of the upper surface on the outer circumferential side of the frame part  31  is exposed. Since the inner diameter of the annular part  40  (a part in which the housing part  40   a  is not formed) of the hoop  4  is set to be smaller than the outer diameter of the frame part  31 , when the exposed part of the upper surface of the frame part  31  is pushed downward by the annular part  40  (the fixed part  41  is fastened and fixed to the fixing part  21  with the bolt B), tension is applied to the film part  30 . 
     In this case, when the fixed part  41  is fixed to the fixing part  21  while the clamped part  51  is housed in the housing part  40   a  of the annular part  40 , the clamped part  51  is clamped between the film part  30  positioned on the outer circumferential side of the cylindrical part  20  and the housing part  40   a . Therefore, the struck part  50  is fixed to the inner circumferential side of the hoop  4 . 
     Here, a state in which tension is applied to the film part  30  is defined as a “tensioned state.” In the tensioned state, the first head sensor S 2  and the second head sensor S 3  are in contact with the lower surface of the film part  30  and vibration generated when the upper surface (struck surface) of the film part  30  is struck is detected by the first head sensor S 2  and the second head sensor S 3 . 
     In addition, in the tensioned state, since the struck part  50  is supported on the cylindrical part  20  via the film part  30 , vibration generated when the struck part  50  is struck is transmitted to the rim sensor S 1  through the film part  30 , the cylindrical part  20 , and the first support part  22 . 
     Results of detection by the rim sensor S 1  and the first and second head sensors S 2  and S 3  are output to a sound generator (not shown), and a musical tone signal based on the detection results is generated by the sound generator. When this musical tone signal is output to an amplifier or a speaker (both are not shown), an electronic musical sound based on the musical tone signal is emitted from the speaker. 
     In this case, since the upper end of the struck part  50  is positioned above the upper end of the annular part  40  in the tensioned state, when a performer performs a technique simulating a rim shot, the struck part  50  can be struck. Therefore, the hoop  4  (the annular part  40 ) can be protected from being struck by the struck part  50 . In addition, since the rim  5  is formed using a rubber-like elastic component, it is possible to reduce a striking sound when the struck part  50  is struck. 
     Since the inner diameter of the struck part  50  is set to be (for example, 4 mm) slightly smaller than the diameter of the cylindrical part  20 , and the outer diameter of the struck part  50  is set to be (for example, 4 mm) slightly larger than the diameter of the cylindrical part  20 , the bottom surface of the struck part  50  and the edge of the opening of the cylindrical part  20  are disposed at vertically overlapping positions. That is, since the inner edge of the bottom surface of the struck part  50  is positioned on the inner circumferential side of the cylindrical part  20  and the outer edge of the bottom surface of the struck part  50  is positioned on the outer circumferential side of the cylindrical part  20 , the bottom surface of the struck part  50  is supported on the edge of the opening of the cylindrical part  20  via the film part  30 . Therefore, vibration generated when the struck part  50  is struck is easily directly transmitted to the cylindrical part  20  through the film part  30 . 
     In addition, since the diameter of the struck part  50  and the diameter of the edge of the opening of the cylindrical part  20  are set to be substantially the same, vibration generated when the struck part  50  is struck is easily directly transmitted to the cylindrical part  20  through the film part  30 . Here, the “diameter” is a value obtained by averaging the inner diameter and the outer diameter of the cylindrical part  20  (the struck part  50 ). 
     In addition, in the struck part  50 , a part on the lower end side has a solid form with a substantially rectangular cross-section, and the bottom surface of the struck part  50  in a region positioned above the cylindrical part  20  with the film part  30  therebetween is formed flat (a shape along the upper surface of the film part  30 ). Therefore, compared to a case in which recesses are formed in a struck part as in the related art, it is possible to reduce elastic deformation of the struck part  50  according to striking. Therefore, since it is possible to reduce a striking force applied to the struck part  50  being buffered by the struck part  50 , vibration generated when the struck part  50  is struck is easily directly transmitted to the cylindrical part  20  through the film part  30 . 
     In addition, since the outer diameter of the struck part  50  is set to be the same as the inner diameter of the annular part  40  (or slightly larger than (for example, 2 mm) thereof), the entire struck part  50  (or a part thereof) is in contact with the inner circumferential surface of the annular part  40 . In addition, the housing part  40   a  is formed in a shape corresponding to the clamped part  51 , and in the tensioned state, the upper end of the clamped part  51  is in contact with the upper surface of the housing part  40   a.    
     Here, in the case of a configuration in which recesses are formed in a rim cover as in the related art (Japanese Unexamined Patent Application Publication No. 2007-249141) and the recesses are fitted to a frame to fix the rim cover, in order to secure releasability when the recesses in the rim cover are released from a mold during molding and workability for fitting the recesses in the rim cover to the frame, it is necessary to use a rubber material having a relatively low JIS-A hardness (hardness based on a JIS type A durometer in JIS K6253 (2012 edition), hereinafter, simply referred to as “hardness”) (for example, a hardness is less than 70). Therefore, a feeling of striking when the rim cover is struck becomes too soft compared to an acoustic drum and the rim cover is easily damaged according to striking. 
     On the other hand, in the present embodiment, since the clamped part  51  is clamped between the housing part  40   a  and the film part  30  and thus the struck part  50  can be fixed to the inner circumferential side of the hoop  4 , it is not necessary to form recesses as in the related art in the struck part  50  (the struck part  50  can have a solid form). Therefore, even if the struck part  50  is formed using a rubber material with a relatively high hardness (for example, a hardness of 90), it is possible to reduce deterioration of the releasability during molding and the workability for a fitting operation. That is, since the struck part  50  can be formed using a rubber material with a higher hardness than that of the related art, a feeling of striking when the struck part  50  is struck is similar to that of an acoustic drum and it is possible to prevent damage to the struck part  50  according to striking. 
     In addition, since the struck part  50  can have a solid form using a rubber material with a relatively high hardness, it is possible to more effectively reduce a striking force applied to the struck part  50  being buffered by the struck part  50 . Therefore, since vibration generated when the struck part  50  is struck is easily directly transmitted to the cylindrical part  20  through the film part  30 , the vibration can be efficiently transmitted to the rim sensor S 1 . 
     Here, for example, a configuration in which the first support part  22  is continuously formed in the circumferential direction of the inner circumferential surface of the cylindrical part  20  can be used. However, in such a configuration, since the first support part  22  easily picks up noise (for example, a musical sound (air vibration) from an instrument or a speaker near the electronic percussion instrument  1  and air vibration generated when the film part  30  is struck), there is a risk of such noise being erroneously detected by the rim sensor S 1 . 
     On the other hand, in the present embodiment, the first support part  22  is connected to a partial region (for example, a region that is ⅛ or less of the circumferential length of the inner circumferential surface of the cylindrical part  20 ) in the circumferential direction of the inner circumferential surface of the cylindrical part  20  (the rim sensor S 1  in a cantilevered state is supported on the inner circumferential surface of the cylindrical part  20  by the first support part  22 ). Therefore, since it is possible to reduce picking up of noise by the first support part  22 , it is possible to reduce erroneous detection of noise by the rim sensor S 1 . In addition, since the first support part  22  can be reduced in size compared to when the first support part  22  is continuously formed in the circumferential direction of the inner circumferential surface of the cylindrical part  20 , it is possible to reduce the product cost (an amount of a resin used) of the body part  2 . 
     On the other hand, when the first support part  22  is connected to a partial region of the inner circumferential surface of the cylindrical part  20 , vibration generated when the struck part  50  is struck at a position away from the first support part  22  (the rim sensor S 1 ) is not easily transmitted to the rim sensor S 1 . However, as described above, the present embodiment has a configuration in which the struck part  50  is disposed above the edge of the opening of the cylindrical part  20 , and vibration generated when the struck part  50  is struck is easily directly transmitted to the cylindrical part  20  through the film part  30 . 
     Therefore, even if the first support part  22  is connected to a partial region of the inner circumferential surface of the cylindrical part  20 , vibration generated when the struck part  50  is struck at a position away from the first support part  22  (the rim sensor S 1 ) can be efficiently transmitted to the rim sensor S 1 . Therefore, it is possible to reduce erroneous detection of noise by the rim sensor S 1  and it is possible to easily detect vibration generated when the struck part  50  is struck by the rim sensor S 1 . Thus, it is possible to accurately generate a musical sound based on striking the film part  30  and the struck part  50 . 
     Here, as described above, the housing part  40   a  is formed in a shape corresponding to the clamped part  51 , and in the tensioned state, the upper end of the clamped part  51  is in contact with the upper surface of the housing part  40   a . Therefore, the clamped part  51  may be pressed downward by the hoop  4  depending on a degree of tension applied to the film part  30 . 
     Therefore, for example, in a configuration in which the recesses  51   a  are not formed in the clamped part  51 , when the clamped part  51  is pressed downward by the hoop  4 , there is a risk of an excessive load being applied to a part connecting the struck part  50  and the clamped part  51  and there is a risk of downward displacement of the hoop  4  being inhibited due to a reaction force of the clamped part  51 . Therefore, there is a risk of the rim  5  being damaged and desired tension not being applied to the film part  30 . 
     On the other hand, in the present embodiment, since the clamped part  51  has recesses  51   a  recessed on the outer circumferential surface of the clamped part  51  toward an inside in the radial direction of the clamped part  51 , it is possible to secure a crushing margin for the clamped part  51 . That is, since the recesses  51   a  are formed as recesses obtained by cutting out the clamped part  51  in a slit shape and are formed by cutting from the outer circumferential surface of the clamped part  51  to the outer circumferential surface of the struck part  50 , when the clamped part  51  is pressed downward by the hoop  4 , the clamped part  51  (a part in which the recesses  51   a  are formed) can be elastically deformed. 
     Therefore, it is possible to reduce an excessive load applied to a part connecting the struck part  50  and the clamped part  51  and reduce inhibition of downward displacement of the hoop  4  due to a reaction force of the clamped part  51 . Therefore, it is possible to prevent damage to the rim  5  and it is possible to apply desired tension to the film part  30 . 
     In this case, if only for the purpose of making the clamped part  51  to be easily elastically deformed, for example, a configuration in which the recesses  51   a  are continuously formed from the upper end to the lower end of the clamped part  51  may be used. However, in such a configuration, the clamped part  51  is easily pulled out from between the housing part  40   a  and the film part  30  due to an external force. 
     On the other hand, in the present embodiment, the recesses  51   a  are formed only in a partial region on the upper end side of the clamped part  51  and the recesses  51   a  are not formed in a region on the lower end side of the clamped part  51 . Therefore, even if an external force with which the clamped part  51  falls out from between the housing part  40   a  and the film part  30  is applied to the struck part  50 , since a part (a part in which the recesses  51   a  are not formed) on the lower end side of the clamped part  51  is caught on the upper surface of the housing part  40   a , it is possible to prevent the clamped part  51  from being pulled out from between the housing part  40   a  and the film part  30 . 
     In order to more effectively prevent the clamped part  51  from being pulled out, for example, a configuration in which the clamped part  51  is continuously formed in the circumferential direction of the struck part  50  can be used. However, in such a configuration, the housing part  40   a  needs to be formed also in a region in which the bolt B is inserted (refer to an enlarged part on the right side in  FIG. 2 ). Since it is necessary to secure the rigidity of the hoop  4  in the region in which the bolt B is inserted, when the housing part  40   a  is formed in such a region, the thickness of the annular part  40  in the radial direction needs to be increased accordingly. Therefore, the electronic percussion instrument increases in size. 
     On the other hand, in the present embodiment, the clamped part  51  is intermittently formed in the circumferential direction of the struck part  50 . Therefore, the housing part  40   a  is intermittently formed in the circumferential direction of the annular part  40  and the housing part  40   a  is formed in a region not overlapping the bolt B in the circumferential direction (the housing part  40   a  is formed at a position not overlapping the bolt B (the through-hole  41   a ) when viewed in the radial direction from the inner circumferential side of the hoop  4 ). Therefore, it is possible to secure the rigidity of the annular part  40  in the region in which the bolt B is inserted. 
     Therefore, since it is not necessary to form the thickness of the annular part  40  in the radial direction to be thicker than necessary in order to secure the rigidity of the hoop  4 , it is possible to reduce the size of the electronic percussion instrument  1  in the radial direction. In addition, since the clamped part  51  and the housing part  40   a  are intermittently formed in the circumferential direction, rotation of the struck part  50  in the circumferential direction can be restricted according to engagement between the clamped part  51  and the housing part  40   a.    
     In addition, the thickness dimension of the clamped part  51  in the radial direction is set to be smaller than the thickness dimension of the frame part  31  in the radial direction, and the outer circumferential surface of the clamped part  51  is positioned radially inward from the outer circumferential surface of the frame part  31 . Therefore, the inner surface of the housing part  40   a  that faces the outer circumferential surface of the clamped part  51  can be positioned radially inward from the outer circumferential surface of the frame part  31 . 
     Therefore, it is possible to secure a contact area between the lower surface of the annular part  40  and the upper surface of the frame part  31  also in a region in which the housing part  40   a  is formed. That is, even if the housing part  40   a  is formed in the annular part  40 , since the entire circumference of the frame part  31  can be pushed by the annular part  40 , tension can be uniformly applied to the entire film part  30 . 
     In addition, since the clamped part  51  is clamped between the film part  30  and the housing part  40   a , compared to when a clamped part  151  is clamped between a hoop  104  and a frame part  131  as in an electronic percussion instrument  101  of the related art (refer to  FIG. 3 ), it is possible to prevent a force of the hoop  4  (a fastening force of the bolt B) that presses the frame part  31  downward from being applied to the clamped part  51 . Therefore, it is possible to reduce an excessive load applied to the clamped part  51  and reduce inhibition of downward displacement of the hoop  4  due to a reaction force of the clamped part  51 . Therefore, it is possible to prevent damage to the rim  5  and it is possible to apply desired tension to the film part  30 . 
     While the disclosure has been described above based on the above embodiment, the disclosure is not limited to the above embodiment, and it can easily understood that various modifications and alternations can be made without departing from the spirit and scope of the disclosure. 
     While a case in which the body part  2  and the hoop  4  are formed using a resin material (glass reinforced nylon) has been described in the above embodiment, the disclosure is not necessarily limited thereto. For example, a configuration in which the body part  2  and the hoop  4  are formed using another resin material, metal material, wood material, or the like may be used. 
     While a case in which the rim  5  is formed using rubber with a hardness of 90 has been described in the above embodiment, the disclosure is not necessarily limited thereto. For example, the rim  5  may be formed using a soft (for example, a hardness of less than 70) rubber material or another resin material (for example, a hard elastomer), but the rim  5  is preferably formed using a hard rubber material with a hardness of 70 or more and 95 or less. 
     When the rim  5  is formed using a rubber material with a hardness of 70 or more, it is possible to reduce a striking force being buffered by the struck part  50  and it is possible to efficiently transmit vibration to the rim sensor S 1 . In addition, when the rim  5  is formed using a rubber material with a hardness of 95 or less, it is possible to reduce a striking sound generated when the struck part  50  is struck. 
     While a case in which the clamped part  51  is clamped between the film part  30  and the housing part  40   a  and thus the rim  5  (the struck part  50 ) is fixed to the inner circumferential side of the hoop  4  has been described in the above embodiment, the disclosure is not necessarily limited thereto. For example, a configuration in which the rim  5  (the struck part  50 ) is adhered to the inner circumferential surface of the hoop  4  may be used. In this case, the housing part  40   a  of the hoop  4  and the clamped part  51  of the rim  5  may be omitted. 
     While a case in which the struck part  50  has a solid form has been described in the above embodiment, the disclosure is not necessarily limited thereto. For example, the inside of the struck part  50  may have a hollow shape, and when at least the bottom surface of the struck part  50  is supported on the edge of the opening of the cylindrical part  20  via the film part  30 , it is possible to efficiently transmit vibration generated when the struck part  50  is struck to the rim sensor S 1 . 
     While a case in which the clamped part  51  is formed in a substantially rectangular parallelepiped has been described in the above embodiment, the disclosure is not necessarily limited thereto. For example, the clamped part  51  may be formed in any polyhedron shape, a columnar shape, or a prismatic shape as long as the shape can prevent falling out from between the housing part  40   a  and the film part  30 . Irrespective of the shape of the clamped part  51 , the housing part  40   a  may be formed in a shape corresponding (engageable with) to the shape. 
     While a case in which the clamped parts  51  and the housing parts  40   a  are formed at equal intervals in the circumferential direction of the struck part  50  has been described in the above embodiment, the disclosure is not necessarily limited thereto. For example, the clamped parts  51  and the housing parts  40   a  may be formed at unequal intervals in the circumferential direction. In addition, a configuration in which the clamped parts  51  and the housing parts  40   a  are continuously formed in the circumferential direction may be used. 
     While a case in which the slit-shaped recesses  51   a  are formed in a part on the upper end side of the clamped part  51  and the recesses  51   a  are formed by cutting out from the outer circumferential surface of the clamped part  51  to the outer circumferential surface of the struck part  50  has been described in the above embodiment, the disclosure is not necessarily limited thereto. A configuration in which the formation position, the shape, and the cut-out depth of the recesses  51   a  can be appropriately set and the recesses  51   a  are not formed may be used. Therefore, for example, a configuration in which the recesses  51   a  are continuously formed from the upper end to the lower end of the clamped part  51  may be used, and the recesses  51   a  may be formed in a partial region such as the lower end side or the center in the vertical direction of the outer circumferential surface of the clamped part  51 . 
     While a case in which the first support part  22  is connected to a partial region of the inner circumferential surface of the cylindrical part  20  in the circumferential direction has been described in the above embodiment, the disclosure is not necessarily limited thereto. For example, a configuration in which the first support part  22  is continuously connected to the inner circumferential surface of the cylindrical part  20  in the circumferential direction may be used. 
     While a case in which the second head sensor S 3  is disposed in the second support part  23  has been described in the above embodiment, the disclosure is not necessarily limited thereto. For example, a configuration in which the second support part  23  and the second head sensor S 3  are omitted may be used. In addition, a configuration in which the second support part  23  and the second head sensor S 3  are included and the first head sensor S 2  is omitted may be used. 
     In addition, a configuration in which an opening on the lower end side of the cylindrical part  20  is blocked to form a bottom surface and the rim sensor S 1 , the first head sensor S 2 , and the second head sensor S 3  are supported on the bottom surface may be used. In this case, the first head sensor S 2  may be omitted and the rim sensor S 1  may be disposed at the center of the bottom surface. 
     While a case in which the rim sensor S 1  is disposed in the first support part  22  has been described in the above embodiment, the disclosure is not necessarily limited thereto. For example, a configuration in which the rim sensor S 1  is disposed on the inner circumferential surface of the cylindrical part  20  or the fixing part  21  may be used. 
     While a case in which the rim sensor S 1  is configured as a piezoelectric element has been described in the above embodiment, the disclosure is not necessarily limited thereto. For example, another sensor configured to detect vibration (for example, an electrodynamic or electrostatic capacity type sensor) may be used to constitute the rim sensor S 1 . 
     While a case in which the first and second head sensors S 2  and S 3  include a piezoelectric element has been described in the above embodiment, the disclosure is not necessarily limited thereto. For example, a pressure sensor, an electrostatic sensor, a laser sensor, or a magnet sensor may be used to constitute the first and second head sensors S 2  and S 3 .