Electronic percussion instrument, detection method using the same, and manufacturing method thereof

Abstract

The present invention provides an electronic percussion instrument, a detection method using the same, and a manufacturing method thereof, which can easily determine the contact between the detected conductor and the drum skin. The electronic percussion instrument includes a cylindrical main body with an open end face in the axial direction, a drum skin covering the struck surface through the open end face in the axial direction of the main body, and an electrostatic capacitance sensor with an electrode arranged on the back side of the drum skin, wherein the drum skin includes an electrically isolated conductive drum skin, and there is no conductor connected to a reference potential point between the surface of the drum skin and the electrode. Thus, the contact between the detected conductor and the drum skin can be easily determined.

Description

Technical Field

[0001] The present invention relates to an electronic percussion instrument, a detection method and a manufacturing method, which can easily determine the contact between a detected conductor and a drum head. Background Art

[0002] Conventionally, electronic percussion instruments imitating percussion instruments such as acoustic drums have been known in which electrodes of electrostatic capacitance sensors are arranged on the back side of drum skins (Patent Document 1). In the electronic percussion instruments, the electrostatic capacitance sensor detects a change in electrostatic capacitance corresponding to the distance between a detected conductor such as a player's hand and the electrode, and determines that the detected conductor has approached the drum skin based on the detection value of the electrostatic capacitance sensor.

[0003] [Prior art literature]

[0004] [Patent Document]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 2017-146461 Summary of the invention

[0006] [Problems to be solved by the invention]

[0007] However, compared with the above-mentioned conventional technology, the industry expects to easily determine the contact between the detected conductor and the drumhead.

[0008] The present invention is made to meet the above-mentioned needs, and its purpose is to provide an electronic percussion instrument and a detection method that can easily determine the contact between the detected conductor and the drum skin.

[0009] [Technical means to solve the problem]

[0010] In order to achieve the above-mentioned purpose, the electronic percussion instrument of the present invention includes a cylindrical main body with an opening at one end face in the axial direction, a drum skin covering the surface to be struck through the opening at one end face in the axial direction of the main body, and an electrostatic capacitance sensor with an electrode arranged on the back side of the drum skin, wherein the drum skin includes an electrically isolated conductive drum skin, and there is no conductor connected to a reference potential point between the surface of the drum skin and the electrode.

[0011] Furthermore, the detection method of the present invention is a detection method using an electronic percussion instrument, wherein the electronic percussion instrument includes an electrically isolated and conductive drum skin, and an electrostatic capacitance sensor arranged on the back side of the drum skin. The detection method is based on the rate of change of the electrostatic capacitance between the electrostatic capacitance sensor and the detected conductor corresponding to the distance between the detected conductor and the drum skin, and determines that the detected conductor is closer to the drum skin than a specified distance. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is an exploded perspective view of the electronic percussion instrument according to the first embodiment.

[0013] Figure 2 It is a cross-section diagram of an electronic percussion instrument.

[0014] Figure 3 It is magnified Figure 2 A partial enlarged cross-sectional view of the electronic percussion instrument in Part III.

[0015] Figure 4 It is a schematic diagram showing the positional relationship between the conductive drum head and each electrode.

[0016] Figure 5 It is a graph showing the detection value of the electrostatic capacitance sensor corresponding to the height of the hand from the drum head.

[0017] Figure 6 It is a graph showing the detection value of the electrostatic capacitance sensor corresponding to the contact position of the hand.

[0018] Figure 7 It is a cross-sectional view of an electronic percussion instrument according to a second embodiment.

[0019] Figure 8 It is a schematic diagram showing the positional relationship between the conductive drum head and each electrode.

[0020] Fig. 9 It is a graph showing the detection value of the electrostatic capacitance sensor corresponding to the contact position of the hand.

[0021] [Explanation of Symbols]

[0022] 10, 60: Electronic percussion instruments

[0023] 11: Main body

[0024] 20: Drumhead

[0025] 20a: Surface

[0026] 20b: Back

[0027] 21: Frame

[0028] 22: First Drum Head

[0029] 23: Second drum head

[0030] 24: Conductive drumhead

[0031] 26: Conductive part

[0032] 27: Non-conductive part

[0033] 40, 61: Electrostatic capacitance sensor

[0034] 41, 62: First electrode (part of the electrode)

[0035] 42, 63: Second electrode (part of the electrode)

[0036] 43: Third electrode (part of the electrode) DETAILED DESCRIPTION

[0037] Hereinafter, the preferred embodiment will be described with reference to the accompanying drawings. Figure 1 , Figure 2 , Figure 3 and Figure 4 The electronic percussion instrument 10 will be described. Figure 1 It is an exploded perspective view of the electronic percussion instrument 10 according to the first embodiment. Figure 2 is a cross-sectional view of the electronic percussion instrument 10 . Figure 3 It is magnified Figure 2 A partial enlarged cross-sectional view of part III of the electronic percussion instrument 10. Figure 4 Schematic diagram showing the positional relationship between the conductive drum head 24 and the electrodes 41, 42, and 43. Figure 1 The upper side of the paper is set as the upper side of the electronic percussion instrument 10. Figure 1 The description will be given with the lower side of the paper being assumed to be the lower side of the electronic percussion instrument 10 .

[0038] like Figure 1 and Figure 2 As shown, the electronic percussion instrument 10 is an electronic musical instrument that imitates a drum played by a player using a drum stick, etc. The electronic percussion instrument 10 includes a body 11 , a drumhead 20 , a rim 17 , a fixing portion 18 , a sensor portion 30 , and an electrostatic capacitance sensor 40 .

[0039] The electronic percussion instrument 10 is a device in which a performer uses a drumstick or the like (not shown) to strike the drum skin 20 or the drum edge 17, and the detection result from the sensor unit 30 based on the strike is output to a sound source device (not shown). Furthermore, the detection result from the electrostatic capacitance sensor 40 is output to the sound source device. Then, a musical sound signal based on these detection results is generated by the sound source device. The musical sound signal is output to a speaker (not shown) via an amplifier (not shown), and electronic musical sound based on the musical sound signal is emitted from the speaker. Furthermore, the sound source device or the speaker may be provided on the electronic percussion instrument 10, or the sound source device or the speaker may be provided as an external device.

[0040] The main body 11 is a substantially cylindrical member having a first end 11a and a second end 11b in the axial direction and having both end surfaces opened. The main body 11 includes a shell 12 and a frame 13. The shell 12 includes a cylindrical metal (conductor) with both end surfaces in the axial direction opened. The lower end of the shell 12 is the second end 11b.

[0041] The frame 13 is a bowl-shaped member made of synthetic resin (insulator). Various members such as the sensor unit 30 and the electrostatic capacitance sensor 40 are mounted on the frame 13. The frame 13 includes a bottom 13a, a side wall 13b, a hook portion 13c, a plurality of protrusions 14, and a plurality of ribs 15.

[0042] The bottom 13a is a generally disk-shaped portion disposed at a predetermined distance from the drumhead 20. The side wall portion 13b is a generally cylindrical portion rising from the outer peripheral edge of the bottom 13a. The hook portion 13c is a generally annular portion provided at the upper edge of the side wall portion 13b. The frame 13 is mounted on the drum shell 12 by hooking the hook portion 13c on the upper end of the drum shell 12. The hook portion 13c constitutes the first end 11a of the main body 11.

[0043] The protrusion 14 is a shaft-shaped portion extending from the bottom 13a toward the drumhead 20. The sensor portion 30 or the electrostatic capacitance sensor 40 is mounted on the upper end of the protrusion 14. The rib 15 is a plate-shaped portion for ensuring the strength and rigidity of the frame 13. The rib 15 is formed integrally with the bottom 13a and the protrusion 14.

[0044] The drumhead 20 is a film-like member that covers the axial end surface of the first end 11a of the main body 11. The surface 20a of the drumhead 20 is struck by a drumstick or the like held by a performer. The back surface 20b of the drumhead 20 faces the main body 11.

[0045] like Figure 3 As shown, the drumhead 20 includes a frame 21, a first drumhead 22, a second drumhead 23, and a conductive drumhead 24. The frame 21 is an annular portion including a metal material or a resin material having a predetermined composition. The frame 21 is disposed on the outer peripheral side of the main body 11.

[0046] The first drumhead 22, the second drumhead 23, and the conductive drumhead 24 are circular films stacked one above the other. The first drumhead 22 forms the front surface 20a. The second drumhead 23 forms the back surface 20b. The first drumhead 22 and the second drumhead 23 include a film (e.g., a film-like member) or a mesh material made of a synthetic resin as an insulator. The first drumhead 22 and the second drumhead 23 are fixed at their outer edges to the frame 21, respectively.

[0047] The conductive drumhead 24 is sandwiched between the first drumhead 22 and the second drumhead 23. The diameter of the conductive drumhead 24 is smaller than the inner diameter of the frame 21. Figure 1As shown in FIG. 1 , a joint portion 25 is provided at the center of the conductive drum head 24 . The joint portion 25 is a portion for limiting relative displacement of the conductive drum head 24 with respect to the first drum head 22 and the second drum head 23 .

[0048] In this embodiment, the conductive drumhead 24 is joined to the first drumhead 22 by the joining portion 25. Furthermore, the conductive drumhead 24 may be joined to the second drumhead 23 by the joining portion 25. Furthermore, the conductive drumhead 24 may be joined to both the first drumhead 22 and the second drumhead 23 by the joining portion 25. Moreover, as a joining method performed by the joining portion 25, sewing, bonding, adhesion, welding, etc. may be exemplified.

[0049] like Figure 4 As shown, the conductive drumhead 24 includes a plain woven mesh material including fibers in a first direction A and fibers in a second direction B that are orthogonal to each other. The fibers in the first direction A are a combination of a conductive portion 26 and a non-conductive portion 27. The fibers in the second direction B are the non-conductive portion 27. Figure 4 In the embodiment, the fibers in the first direction A, that is, the non-conductive portion 27 and the conductive portion 26 are adjacent to each other, but the non-conductive portion 27 and the conductive portion 26 may be separated from each other.

[0050] The conductive portion 26 is a fiber including a conductor extending in the first direction A. As the fiber constituting the conductive portion 26, for example, carbon fiber can be used. The plurality of conductive portions 26 are separated from each other in the second direction B. Furthermore, as the fiber constituting the conductive portion 26, it is sufficient as long as the resistance value per 1 cm is about 100 kΩ or less.

[0051] The non-conductive part 27 includes fibers of an insulator such as nylon. The conductive drum head 24 is formed by weaving a plurality of conductive parts 26 into a mesh material including the plurality of non-conductive parts 27 and fixing them. By arranging the non-conductive part 27 between adjacent conductive parts 26, contact between adjacent conductive parts 26 can be prevented.

[0052] like Figure 2 and Figure 3 As shown, the rim 17 is a substantially annular member that applies tension to the drumhead 20. The rim 17 is disposed on the outer peripheral side of the main body 11. The rim 17 includes a frame contact portion 17a, an elastic member 17b, and a flange 17c.

[0053] The frame contact portion 17a is a substantially cylindrical portion whose lower end contacts the frame portion 21. The elastic member 17b is a substantially annular portion provided at the upper end of the frame contact portion 17a over the entire circumference. The elastic member 17b is made of an elastic material such as sponge, rubber, or thermoplastic elastomer, and is struck by the player. Thus, the striking sound when the drum edge 17 is struck can be reduced.

[0054] The flange 17c is an annular plate-shaped portion extending radially outward from the lower end of the frame contact portion 17a. The flange 17c is provided with a plurality of holes (not shown) for inserting the bolts 16. The flange 17c and the frame contact portion 17a together press the frame portion 21 downward (toward the second end 11b).

[0055] The fixing portion 18 is a member for fixing the rim 17 to the main body 11. The fixing portion 18 includes an annular portion 18a, a plurality of protruding portions 18b, and a plurality of cylindrical portions 18c. The annular portion 18a is fixed to the second end 11b of the main body 11 (see Figure 2 ) is an annular portion. The plurality of extension portions 18b are portions formed by extending radially outward from the annular portion 18a. The plurality of extension portions 18b are arranged at equal intervals in the circumferential direction of the annular portion 18a.

[0056] The plurality of cylinder portions 18c are cylindrical portions extending from the extension portion 18b toward the first end 11a. The cylinder portions 18c are disposed on the outer peripheral side of the main body portion 11. The cylinder portions 18c have internal threads on the inner peripheral surface thereof into which the bolts 16 are fitted.

[0057] The drumhead 20 is mounted on the main body 11 by placing the rim 17 on the frame 21 of the drumhead 20 covering the first end 11a of the main body 11 and inserting the bolt 16 penetrating the rim 17 into the tube 18c. The frame 21 is pressed downward by tightening the bolt 16. Thus, tension is applied to the first drumhead 22 and the second drumhead 23 whose outer edges are fixed to the frame 21.

[0058] At this time, since the outer edge of the conductive drum head 24 is not fixed to the frame 21, it is possible to prevent tension from being applied to the conductive drum head 24. In addition, the conductive drum head 24 is located radially inward of the contact position between the drum head 20 (second drum head 23) and the first end 11a of the body 11. This prevents the conductive drum head 24 from being sandwiched between the first drum head 22 and the first end 11a of the body 11 and from being subjected to tension. As a result, the durability of the conductive drum head 24 can be improved.

[0059] Since the conductive drum head 24 is sandwiched between the first drum head 22 and the second drum head 23 to which tension is applied, the position of the conductive drum head 24 can be fixed with a simple structure. In addition, since the relative displacement of the conductive drum head 24 with respect to the first drum head 22 and the second drum head 23 is restricted by the joint 25, the position of the conductive drum head 24 can be fixed even before tension is applied to the first drum head 22 and the second drum head 23. Thus, a part of the conductive drum head 24 can be prevented from being located outside the contact position between the drum head 20 and the first end 11a.

[0060] In addition, since only a portion of the center of the conductive drum head 24 is fixed to the first drum head 22 by the joint 25, it is possible to suppress the conductive drum head 24 from extending in the radial direction in accordance with the radial extension of the first drum head 22. This makes it more difficult to apply tension to the conductive drum head 24, so that the durability of the conductive drum head 24 can be further improved.

[0061] Furthermore, the first drumhead 22 and the second drumhead 23 include an insulator, so that the conductive drumhead 24 can be electrically isolated with a simple structure. The conductive drumhead 24 is sandwiched between the first drumhead 22 and the second drumhead 23 and does not contact the frame 21. As a result, the drumhead 20 having the electrically isolated conductive drumhead 24 can be easily manufactured. Furthermore, the so-called electrical isolation means a state in which there is no electrical connection with any part such as a reference potential point (ground) or various wirings, electronic components, etc. However, the following situations are excluded: when the hand H (refer to Figure 4 ) and other detected conductors are in direct contact with the conductive drum skin 24, so that the hand H and the conductive drum skin 24 are electrically connected.

[0062] like Figure 2 As shown, the sensor unit 30 is a sensor for detecting the electronic percussion instrument 10 being struck. The sensor unit 30 is installed at the center of the frame 13. The sensor unit 30 includes a plate 31, a drumhead sensor 33, a cushion 34, and a drum edge sensor 35.

[0063] A head sensor 33 is attached to the upper surface of the flat plate 31 attached to the front end of the protrusion 14 via double-sided tape 32. A rim sensor 35 is attached to the lower surface of the flat plate 31 via double-sided tape 32. The head sensor 33 and the rim sensor 35 are disc-shaped sensors including piezoelectric elements.

[0064] The vibration of the struck drumhead 20 is mainly transmitted to the drumhead sensor 33 via the cushion pad 34. The vibration of the struck drumhead 20 is mainly transmitted to the drumhead rim sensor 35 via the frame 13 etc. The detection results (output level ratio) of the drumhead sensor 33 and the drumhead rim sensor 35 are different due to the difference in the transmission paths, so that it can be determined which of the drumhead 20 or the drumhead rim 17 is struck.

[0065] like Figure 1 and Figure 2 As shown, the electrostatic capacitance sensor 40 is a self-capacitance type sensor that detects that a detected conductor such as a human body has approached the drum head 20. The electrostatic capacitance sensor 40 includes a first electrode 41, a second electrode 42, a third electrode 43, and a control substrate 44. The first electrode 41, the second electrode 42, and the third electrode 43 (hereinafter referred to as "each electrode 41, electrode 42, electrode 43") are electrically connected to the control substrate 44 via wiring (not shown).

[0066] Each electrode 41, electrode 42, electrode 43 is a fan-shaped conductor (for example, metal or conductive polymer, graphite) centered on the axis of the main body 11. Each electrode 41, electrode 42, electrode 43 has the same shape. As a result, the types of parts can be reduced and the part cost of each electrode 41, electrode 42, electrode 43 can be suppressed. In addition, each electrode 41, electrode 42, electrode 43 can be regarded as a circular electrode divided at equal intervals in the circumferential direction of the main body 11 when viewed from the top.

[0067] Each electrode 41, electrode 42, and electrode 43 is fixed to the front end of the protrusion 14, and is arranged at a predetermined distance from the bottom 13a and the drumhead 20. Each electrode 41, electrode 42, and electrode 43 is slightly inclined downward toward the center of the main body 11, but is arranged substantially parallel to the drumhead 20. Each electrode 41, electrode 42, and electrode 43 faces the drumhead 20.

[0068] The detection method of the electrostatic capacitance sensor 40 is described. First, the hand H of the player (see Figure 4 ) is not close to the drum skin 20, a specified electrostatic capacitance (parasitic capacitance) is generated between a conductor (wiring in the control substrate 44, etc.) connected to a reference potential point (not shown) in the control substrate 44, or a grounded portion such as the ground or a wall (connected to a reference potential point such as the earth) and each electrode 41, electrode 42, and electrode 43.

[0069] When the hand H is brought close to the drumhead 20, a new capacitor (condenser) having an electrostatic capacitance corresponding to the distance between each electrode 41, electrode 42, electrode 43 and the hand H is formed between each electrode 41, electrode 42, electrode 43 and the hand H. The electrostatic capacitance around each electrode 41, electrode 42, electrode 43 increases by an amount corresponding to the electrostatic capacitance of the new capacitor. The electrostatic capacitance sensor 40 detects the approach of the hand H to the drumhead 20 based on the change in the electrostatic capacitance.

[0070] However, when a conductor connected to the reference potential point exists between each electrode 41, electrode 42, electrode 43 and the surface 20a of the drumhead 20, since the conductor connected to the reference potential point functions as an electrostatic shielding portion, no new capacitor is formed between each electrode 41, electrode 42, electrode 43 and the hand H. For example, when the conductive drumhead 24 is connected to the reference potential point, changes in electrostatic capacitance between each electrode 41, electrode 42, electrode 43 and the conductive drumhead 24 caused by the vibration of the drumhead 20 are detected by the electrostatic capacitance sensor 40. That is, the electrostatic capacitance sensor 40 can detect a blow to the drumhead 20. However, in this case, the electrostatic capacitance sensor 40 cannot detect that the hand H has approached the drumhead 20, especially that the hand H is in contact with the drumhead 20.

[0071] On the other hand, when one or more selected from a conductor and an insulator not connected to the reference potential point is included between each electrode 41, electrode 42, electrode 43 and the surface 20a, a new capacitor can be formed between the first electrode 41 and the hand H. In the present embodiment, the first drumhead 22 and the second drumhead 23, which are insulators, and the electrically isolated conductive drumhead 24 (a composite of a conductor and an insulator) are located between each electrode 41, electrode 42, electrode 43 and the surface 20a. That is, in the present embodiment, there is no conductor connected to the reference potential point between each electrode 41, electrode 42, electrode 43 and the surface 20a, so it can be detected that the hand H has approached the drumhead 20 and that the hand H has come into contact with the drumhead 20.

[0072] The drum case 12 including a conductor is connected to a reference potential point via wiring (not shown). Thus, the drum case 12 functions as an electrostatic shield, thereby suppressing changes in capacitance detected by the capacitance sensor 40 due to changes in the distance between the main body 11 and the human body.

[0073] Secondly, refer to Figure 5 , explaining the change in the detection value of the electrostatic capacitance sensor 40 (the electrostatic capacitance between each electrode 41 , electrode 42 , electrode 43 and the hand H) caused by the presence or absence of the conductive drum head 24 . Figure 5 : is a graph showing the detection value of the electrostatic capacitance sensor 40 corresponding to the height of the hand H from the drumhead 20 .

[0074] Figure 5 The horizontal axis of the curve graph is the height of the hand H from the drum skin 20. The horizontal axis indicates that the hand H is farther away from the drum skin 20 (the hand H is at a high position) as it moves to the left from the contact position. The right side of the contact position indicates the amount of pressure when the hand H is pressed further from the contact position to the drum skin 20. The vertical axis is the detection value (electrostatic capacitance) of the electrostatic capacitance sensor 40. Figure 5, the solid line indicates the detection value of the electronic percussion instrument 10 having the conductive drumhead 24, and the dotted line indicates the detection value of the electronic percussion instrument 50 of the comparative example. The electronic percussion instrument 50 is configured similarly to the electronic percussion instrument 10 except that the conductive drumhead 24 is replaced with an insulator drumhead.

[0075] In the electronic percussion instrument 50, as the hand H approaches the drumhead 20, the detection value increases exponentially. On the other hand, in the electronic percussion instrument 10 having the conductive drumhead 24, the increase in the detection value is small before the drumhead 20 contacts the hand H, and the detection value increases suddenly when the drumhead 20 contacts the hand H. More specifically, the detection value increases suddenly when the distance between the drumhead 20 and the hand H is 1 mm to 2 mm. Furthermore, there is almost no case where the drumhead 20 and the hand H are not in contact by keeping the distance between the drumhead 20 and the hand H at 1 mm to 2 mm, so it can be regarded that the hand H has contacted the drumhead 20 when the distance between the drumhead 20 and the hand H becomes 1 mm to 2 mm.

[0076] The principle of the sudden increase in the detection value due to the conductive drum head 24 is described below. A capacitor is formed between the hand H and each of the electrodes 41, 42, and 43, and the electrostatic capacitance of the capacitor (the detection value of the electrostatic capacitance sensor 40) changes according to the distance between the hand H and each of the electrodes 41, 42, and 43. When the hand H and the drum head 20 are separated by about 2 mm or more, the influence of the conductive drum head 24 on the electrostatic capacitance of the capacitor between the hand H and each of the electrodes 41, 42, and 43 cannot be ignored.

[0077] If the distance between the hand H and the drum head 20 is 1 mm to 2 mm, the electrostatic capacitance between the hand H and the conductive drum head 24 increases, which is substantially the same as the case where charges are exchanged between the hand H and the conductive drum head 24. That is, even if the first drum head 22 is between the hand H and the conductive drum head 24, it is substantially the same as the state where the hand H and the conductive drum head 24 are electrically connected. Furthermore, if there is no first drum head 22, the hand H and the conductive drum head 24 are in contact, and the hand H and the conductive drum head 24 are in an electrically connected state.

[0078] When the hand H is electrically connected to the conductive drum head 24 (conductive portion 26), the conductive drum head 24 and the hand H together form electrodes facing each of the electrodes 41, 42, and 43. Therefore, the electrostatic capacitance of the capacitor between the hand H and each of the electrodes 41, 42, and 43 increases rapidly, similar to the case where the area of ​​the hand H (the electrode of the capacitor) increases rapidly when the distance between the hand H and the drum head 20 is 1 mm to 2 mm.

[0079] By detecting the sudden increase in the detection value of the electrostatic capacitance sensor 40 (a sudden change in the rate of increase of the detection value) by the control substrate 44 or the external device, the control substrate 44 or the external device determines that the hand H has come into contact with the drum head 20. As a result, it is easier to determine that the hand H has come into contact with the drum head 20 when the conductive drum head 24 is provided than when the conductive drum head 24 is not provided.

[0080] Furthermore, if the resistance value per cm of the fibrous conductive portion 26 is about 100 kΩ or less, the detection value can be increased sufficiently sharply when the hand H contacts the drum head 20 (when the distance between the drum head 20 and the hand H becomes 1 mm to 2 mm or less). Therefore, it can be easily determined that the hand H has contacted the drum head 20 from the sudden increase in the detection value.

[0081] Here, the detection value of the electrostatic capacitance sensor 40 for the distance between the drumhead 20 and the hand H varies depending on various conditions such as the area of ​​each electrode 41, electrode 42, and electrode 43, the size of the hand H, etc. Therefore, when determining that the hand H has contacted the drumhead 20 when the detection value of the electrostatic capacitance sensor 40 exceeds a predetermined threshold value, the threshold value of the detection value must be appropriately set according to various conditions.

[0082] In contrast, in the present embodiment, based on a sudden increase in the detection value of the electrostatic capacitance sensor 40, specifically, based on the first differential value (increase rate) of the electrostatic capacitance between the hand H and each of the electrodes 41, 42, and 43 exceeding a predetermined threshold value, it is determined that the hand H has touched the drumhead 20 (the distance between the drumhead 20 and the hand H becomes 1 mm to 2 mm or less). Since the increase rate of the electrostatic capacitance (detection value) changes little depending on various conditions, it is easy to set a threshold value for the increase rate of the electrostatic capacitance, and it is easy to determine that the hand H has touched the drumhead 20.

[0083] Furthermore, for example, when the hand H is brought into contact with the drum skin 20 to produce a mute, in most cases the hand H is covered on the drum skin 20 before and after the mute is produced. Even when the hand H directly strikes the drum skin 20 to produce a musical sound, in most cases the hand H is covered on the drum skin 20 before and after the strike. In this case, in the electronic percussion instrument 50, although the hand H is merely covered, it is sometimes determined that the hand H has contacted the drum skin 20. As a result, a mute is produced unexpectedly or a musical sound is produced. In contrast, in the electronic percussion instrument 10, it is easy to determine whether the hand H has contacted the drum skin 20 by means of the conductive drum skin 24, so that the unintentional production of a mute or a musical sound can be suppressed.

[0084] In the electronic percussion instrument 50, the inclination of the curve near the contact position is gentle, so the change of the detection position relative to the error of the detection value is large, and it is easy to make an erroneous judgment. On the other hand, in the electronic percussion instrument 10, the inclination of the curve near the contact position is steep, so the change of the detection position relative to the error of the detection value is small, and it is difficult to make an erroneous judgment.

[0085] As described above, in the electronic percussion instrument 10, even if the hand H does not directly touch the conductive drumhead 24, it touches the first drumhead 22 disposed on the surface 20a side of the conductive drumhead 24, thereby suddenly increasing the detection value of the electrostatic capacitance sensor 40. Thus, while protecting the conductive drumhead 24 from the drumstick or the hand H during the striking, it is easy to determine that the hand H has touched the drumhead 20.

[0086] Furthermore, when the hand H is brought into contact with the drumhead 20 and then the drumhead 20 is pressed by the hand H, the detection value of the electrostatic capacitance sensor 40 further increases according to the amount of pressing. Thus, it is possible to detect that the hand H has pressed the drumhead 20 after the drumhead 20 has been brought into contact with the drumhead 20, or the amount of pressing of the drumhead 20, by the electrostatic capacitance sensor 40. As a result, the electronic musical sound generated by the hand H bringing the drumhead 20 into contact with the drumhead 20 and by pressing the drumhead 20 can be made different, and the electronic musical sound can be changed according to the amount of pressing of the drumhead 20.

[0087] Secondly, refer to Figure 4 and Figure 6 , the positional relationship between the conductive portion 26 of the conductive drum head 24 and each of the electrodes 41 , 42 , and 43 will be described. Figure 6 : is a graph showing the detection value of the electrostatic capacitance sensor 40 corresponding to the position where the hand H contacts the drumhead 20 .

[0088] like Figure 4 As shown in the figure, the plurality of conductive portions 26 extending along the first direction A are arranged to be separated from each other in the second direction B. With respect to the plurality of conductive portions 26, the first electrode 41 and the second electrode 42 are arranged to be separated from each other in the second direction B in a manner of being located on both sides of a straight line parallel to the first direction A. That is, one electrode is divided into two in the second direction B in a manner of being located on both sides of a straight line parallel to the first direction A, and the first electrode 41 and the second electrode 42 are provided.

[0089] As described above, when the conductive portion 26 is provided parallel to the boundary line between the first electrode 41 and the second electrode 42 in top view, the hand H is moved closer to the drumhead 20 while changing the position of the hand H from directly above the second electrode 42 to directly above the first electrode 41 . Figure 6 Detection values ​​of the electrostatic capacitance sensor 40 with respect to the first electrode 41 when the hand H is brought into contact with the drumhead 20 at various positions are shown.

[0090] Figure 6 The vertical axis of the graph is the detection value of the electrostatic capacitance sensor 40 with respect to the first electrode 41 . Figure 6 The horizontal axis of the graph is the distance between the edge of the first electrode 41 and the front end of the hand H. Furthermore, the relationship between the edge of the first electrode 41 and the front end of the hand H is schematically illustrated at the lower part of the horizontal axis.

[0091] When the hand H is not directly above the first electrode 41 ( Figure 6 The detection value of the electrostatic capacitance sensor 40 remains almost unchanged when the hand H is located directly above the first electrode 41 (when the value of the horizontal axis is greater than 0 mm). On the other hand, when the hand H is located directly above the first electrode 41 (when the value of the horizontal axis is greater than 0 mm), the detection value of the electrostatic capacitance sensor 40 gradually changes as the front end of the hand H separates from the edge of the first electrode 41 (the area of ​​the hand H located directly above the first electrode 41 increases).

[0092] When the edge of the first electrode 41 is separated from the front end of the hand H by more than 20 mm (when the value of the horizontal axis is less than -20 mm), it is almost impossible to obtain the detection value of the electrostatic capacitance sensor 40 with respect to the first electrode 41. Furthermore, even if the distance between the first electrode 41 and the drumhead 20 is changed to change the detection value of the electrostatic capacitance sensor 40 as a whole, it is still almost impossible to obtain the detection value when the first electrode 41 is separated from the hand H by more than 20 mm.

[0093] In contrast, the following case is discussed: the conductive portion 26 is provided across the first electrode 41 and the second electrode 42 (the conductive portion 26 is provided not parallel to the boundary line between the first electrode 41 and the second electrode 42 when viewed from the top), and the hand H is located directly above the second electrode 42. In this case, if the plurality of conductive portions 26 located directly below the hand H form electrodes over the entire length, the conductive portions 26 face both the first electrode 41 and the second electrode 42. Therefore, depending on the height of the hand H, not only the detection value of the electrostatic capacitance sensor 40 regarding the second electrode 42 but also the detection value of the electrostatic capacitance sensor 40 regarding the first electrode 41 changes.

[0094] The detection value of each electrostatic capacitance sensor 40 depends on the area of ​​the portion where the plurality of conductive portions 26 that form electrodes over the entire length face each other, and the electrodes 41 and 42. Therefore, when the area of ​​the portion where the conductive portion 26 faces the first electrode 41 is the same as the area of ​​the portion where the conductive portion 26 faces the second electrode 42, the detection value of each electrostatic capacitance sensor 40 is substantially the same. Therefore, when the conductive portion 26 is not provided parallel to the boundary line between the first electrode 41 and the second electrode 42 when viewed from above, the position where the hand H touches the drumhead 20 cannot be detected.

[0095] Furthermore, regardless of whether the boundary line between the first electrode 41 and the second electrode 42 is parallel to the conductive portion 26 or not, the change in the detection value of the electrostatic capacitance sensor 40 regarding the second electrode 42 relative to the distance between the second electrode 42 and the hand H shows the same behavior as the change in the detection value of the electrostatic capacitance sensor 40 regarding the first electrode 41 relative to the distance between the first electrode 41 and the hand H. As a result, in this embodiment, by providing the conductive portion 26 in parallel with the boundary line between the first electrode 41 and the second electrode 42 when viewed from the top, the difference between the detection value of the first electrode 41 and the detection value of the second electrode 42 corresponding to the position where the hand H contacts the drumhead 20 can be increased. Thus, the position where the hand H contacts the drumhead 20 can be easily detected from the difference. In particular, it is easy to detect which of the first electrode 41 and the second electrode 42 is directly above the hand H that has contacted the drumhead 20.

[0096] When the first electrode 41 and the second electrode 42 are further divided into a plurality of electrodes in the second direction B, the contact position of the hand H can be detected in more detail from the difference in the detection values ​​of the divided electrodes. As described above, when the front end of the hand H contacting the drumhead 20 is separated from the edge of the first electrode 41 (each electrode) by more than 20 mm, the detection value of the electrostatic capacitance sensor 40 with respect to the electrode can hardly be obtained. Therefore, it can be determined that the hand H has contacted the drumhead 20 at a position separated from the electrode by more than 20 mm from which the detection value of the electrostatic capacitance sensor 40 can hardly be obtained.

[0097] By forming the shapes of the electrodes 41 and 42 (the shapes of the electrodes divided in the second direction B) to be the same, the detection sensitivity of the electrodes 41 and 42 can be made uniform. As a result, the detection accuracy of the contact position of the hand H based on the difference in the detection values ​​of the electrodes 41 and 42 can be improved. In addition, if the shapes of the electrodes 41 and 42 are the same, even if the hand H is located on the boundary line of the electrodes 41 and 42, the detection values ​​of the electrodes 41 and 42 can be made different according to the areas of the facing parts of the plurality of conductive parts 26 located directly below the hand H and the electrodes 41 and 42. As a result, even if the hand H is located on the boundary line of the electrodes 41 and 42, the position where the hand H touches the drumhead 20 can be easily detected.

[0098] If the hand H located on the boundary between the electrodes 41 and 42 is moved in the second direction B, one of the detection values ​​of the electrodes 41 and 42 increases and the other decreases. Thus, the movement of the hand H and the direction of movement can be detected.

[0099] Secondly, refer to Figure 7 , Figure 8 and Fig. 9The second embodiment is described. In the first embodiment, the case where the electrodes 41, 42, and 43 of the electrostatic capacitance sensor 40 are arranged to face the drumhead 20 is described. In contrast, in the second embodiment, the case where the first electrode 62 and the second electrode 63 (hereinafter referred to as "electrodes 62 and 63") of the electrostatic capacitance sensor 61 are arranged on the inner peripheral surface of the main body 11 is described. In addition, the same reference numerals are attached to the same parts as those in the first embodiment, and the following description is omitted.

[0100] First, refer to Figure 7 An electronic percussion instrument 60 according to a second embodiment will be described. Figure 7 60 is a cross-sectional view of the electronic percussion instrument. Figure 7 As shown, the electrostatic capacitance sensor 61 of the electronic percussion instrument 60 is a self-capacitance sensor that detects when a detected conductor such as a human body approaches the drumhead 20. The electrostatic capacitance sensor 61 includes a first electrode 62, a second electrode 63, and a control substrate 44. Each electrode 62 and electrode 63 is electrically connected to the control substrate 44.

[0101] Each electrode 62 and electrode 63 is a strip conductor attached to the inner peripheral surface of the main body 11 (side wall 13b of the frame 13) over half of the circumference. Thus, the protrusion 14 and rib 15 provided on a part of the frame 13 can be omitted.

[0102] Each electrode 62, 63 can be regarded as a member that divides an annular electrode in top view, which is attached to the entire circumference of the inner circumference of the main body 11, into two equal parts. Each electrode 62, 63 is inclined toward the center of the main body 11 as it goes downward.

[0103] Secondly, refer to Figure 8 and Fig. 9 The detection value of the electrostatic capacitance sensor 61 will be described. Figure 8 Schematic diagram showing the positional relationship between the conductive portion 26 of the conductive drum head 24 and the electrodes 62 and 63. Figure 8 As shown in FIG. 1 , the plurality of conductive portions 26 extending along the first direction A are arranged to be separated from each other in the second direction B. With respect to the plurality of conductive portions 26, the first electrode 62 and the second electrode 63 are arranged to be separated from each other in the first direction A in such a manner as to be located on both sides of a straight line parallel to the second direction B. That is, the annular electrode is divided into two in the first direction A, and the first electrode 62 and the second electrode 63 are provided.

[0104] Fig. 9 Indicated in Figure 8 The change in the detection value of the electrostatic capacitance sensor 61 with respect to the first electrode 62 corresponding to the height of the hand H from the drumhead 20 at positions 64 to 68 of the conductive drumhead 24 (drumhead 20) shown in FIG. Fig. 9 In FIG. 1 , the curve graph of the detection value at position 64 is represented by a solid line. Furthermore, the curve graphs of the detection values ​​at positions 65 and 66 are substantially the same as the curve graph of the detection value at position 64. Fig. 9 In FIG. 1 , the dashed line represents the curve diagram of the detection value at position 67. Fig. 9 In the graph, the detection value at position 68 is represented by a dashed line. Fig. 9 The horizontal axis of is the height of the hand H from the drumhead 20 , indicating that the hand H is located at a higher position as it moves to the left from the contact position. The vertical axis is the detection value of the electrostatic capacitance sensor 61 .

[0105] At all positions 64 to 68 , the increase in the detection value is small before the drumhead 20 contacts the hand H, and the detection value increases suddenly when the drumhead 20 contacts the hand H. As a result, similarly to the first embodiment, it is possible to easily determine that the hand H has contacted the drumhead 20 through the conductive drumhead 24 .

[0106] The detection value of the electrostatic capacitance sensor 61 when the hand H contacts the drumhead 20 is largest at positions 64 to 66, second largest at position 67, and smallest at position 68. That is, the closer to the first electrode 62, the larger the detection value when contacting the drumhead 20.

[0107] Furthermore, the change in the detection value of the electrostatic capacitance sensor 61 about the second electrode 63 shows the same behavior as the change in the detection value of the electrostatic capacitance sensor 61 about the first electrode 62. That is, in the graph of the detection value of the electrostatic capacitance sensor 61 about the second electrode 63, the positions 65, 66, and 68 are represented by solid lines, the position 67 is represented by a dotted line, and the position 64 is represented by a dashed line.

[0108] The reason why the detection value of the electrostatic capacitance sensor 61 changes as described above is that the conductive portion 26 located directly below the hand H serves as an electrode over the entire length, and the conductive portion 26 serving as the electrode extends to the vicinity of each electrode 62, 63. Therefore, even if each electrode 62, 63 is mounted on the inner circumferential surface of the main body 11, the detection value of the electrostatic capacitance sensor 61 can be changed according to the height of the hand H from the drum head 20 through the conductive drum head 24 (conductive portion 26).

[0109] In addition, the longer the distance from the position where the hand H touches the drumhead 20 to the first electrode 62, the greater the resistance of the conductive portion 26 therebetween. Moreover, in the second embodiment, the facing area between the conductive portion 26 and each electrode 62 and electrode 63 is smaller than in the first embodiment, so the detection value of the electrostatic capacitance sensor 61 is reduced as a whole. Therefore, the detection value of the electrostatic capacitance sensor 61 is prone to change according to the resistance of the conductive portion 26. As a result, the farther the position 64 to the position 68 are from each electrode 62 and electrode 63, the smaller the detection value of the electrostatic capacitance sensor 61. Thus, based on the difference between the detection value of the first electrode 62 and the detection value of the second electrode 63, it is possible to detect at which position in the first direction A of the drumhead 20 the hand H is in contact.

[0110] Furthermore, each electrode 62, 63 is divided into a plurality of electrodes in the second direction B so as to be located on both sides of a straight line parallel to the first direction A. As in the first embodiment, the detection values ​​of each divided electrode 62, 63 in the second direction B can be made different. As a result, the contact position of the hand H with the drumhead 20 in the second direction B can be detected.

[0111] The present invention has been described above based on the above-described embodiment, but the present invention is not limited to the above-described embodiment at all, and it can be easily inferred that various improvements and modifications can be made without departing from the scope of the present invention. For example, not only the case where each electrode 41, electrode 42, electrode 43, electrode 62, electrode 63 is inclined relative to the drumhead 20, but the drumhead 20 and each electrode 41, electrode 42, electrode 43, electrode 62, electrode 63 can also be made completely parallel. In addition, the drumhead 20 and each electrode 62, electrode 63 can also be made completely perpendicular. In addition, it is also possible to provide each electrode 41, electrode 42, electrode 43 and each electrode 62, electrode 63 together.

[0112] In the above-mentioned embodiments, the electronic percussion instrument 10 and the electronic percussion instrument 60 imitating the drum have been described, but they are not necessarily limited thereto. It is also possible to have an opening at least at one of the two ends of the cylindrical main body 11 in the axial direction, and to cover the opening with the drum skin 20 to imitate an electronic percussion instrument other than a drum, and to provide a conductive drum skin 24 and an electrostatic capacitance sensor 40 and an electrostatic capacitance sensor 61. As percussion instruments other than drums, for example, cajon, conga, bongo, timbales, tympani, etc. can be cited.

[0113] Furthermore, the main body 11 may be formed into a cylindrical shape other than a cylindrical shape according to the percussion instrument to be imitated. The shapes of the frame 13, the drum skin 20, the drum rim 17, the electrodes 41, 42, 43, 62, 63, etc. may be determined in accordance with the shape of the main body. Furthermore, a part of the human body (such as a foot) other than the hand H may be set as a conductor to be detected according to the percussion instrument to be imitated. When a drumstick or the like is brought into contact with the drum skin 20, the drumstick or the like may be connected to a reference potential point such as the human body or a ground wire, and the drumstick or the like may be set as a conductor to be detected.

[0114] In the first embodiment, the conductive drumhead 24 is described as including a plain weave mesh material, but the present invention is not necessarily limited thereto. The conductive drumhead 24 may be formed of a twill weave (twill structure) or satin weave mesh material. Furthermore, the conductive drumhead 24 may be formed of a film (e.g., a film-like member) made of a synthetic resin having conductivity, or a rubber plate, a metal plate, a metal foil, or the like. The conductive drumhead 24 may be formed by fixing a plurality of conductive parts 26 to a non-conductive part 27 including an insulator such as a film or a textile or a knitted fabric by bonding or the like. The plurality of conductive parts 26 may be arranged in the first direction A and the second direction B, respectively. Furthermore, the plurality of conductive parts 26 extending in the first direction A may be brought into contact in the second direction B. Furthermore, the conductive drumhead 24 may be formed by setting all fibers as the conductive parts 26. Furthermore, the conductive part 26 is not limited to carbon fibers, and metal wires or metal fibers, conductive polymer fibers, fibers obtained by coating the surface of fibers including an insulator with a conductor, or the like may be used.

[0115] In the first embodiment, a part of the center of the conductive drum head 24 is bonded to at least one of the first drum head 22 and the second drum head 23 via the bonding portion 25, but the present invention is not necessarily limited to this. The bonding portion 25 may be provided on substantially the entire surface of the conductive drum head 24, or the bonding portion 25 may be provided continuously or intermittently on the outer edge of the conductive drum head 24. Furthermore, the first drum head 22 and the second drum head 23 on the outer side of the conductive drum head 24 may be bonded via the bonding portion 25. In this case, the conductive drum head 24 may not be bonded to the first drum head 22 or the second drum head 23, but the movement of the conductive drum head 24 relative to the first drum head 22 and the second drum head 23 may be restricted by the bonding portion 25.

[0116] Furthermore, the joint portion may be omitted. In addition, the joint portion may be omitted while the insulator is integrated with at least a portion of the outer edge of the conductive drumhead 24. By fixing the insulator to the frame 21, the conductive drumhead 24 can be fixed to the frame 21 while preventing the conductive drumhead 24 from contacting a conductor such as the frame 21.

[0117] In the first embodiment, the drumhead 20 in which the conductive drumhead 24 is sandwiched between the first drumhead 22 and the second drumhead 23 has been described, but the present invention is not necessarily limited to this. One or both of the first drumhead 22 and the second drumhead 23 may be omitted. In this case, the outer edge of the conductive drumhead 24 or an insulator integrated with the outer edge is fixed to the frame 21. However, when the first drumhead 22 or the second drumhead 23 is provided, the substantially entire surface or the outer edge of the conductive drumhead 24 may be joined to the first drumhead 22 or the second drumhead 23 by the joining portion 25.

[0118] In the first embodiment, the following situation has been described, that is, the electrodes 41, 42, and 43 are provided in a manner that the electrodes that are circular when viewed from the top are divided into three equal parts in the circumferential direction. In the second embodiment, the following situation has been described, that is, the electrodes 62 and 63 are provided in a manner that the electrodes that are annular when viewed from the top are divided into two equal parts in the circumferential direction. However, it is not necessarily limited to this. The number of electrode divisions, the direction of division, the shape of each divided electrode, etc. can also be appropriately changed. In addition, the circular or annular electrode can also be used without being divided.

[0119] In the above-mentioned embodiments, the electrostatic capacitance sensor 40 and the electrostatic capacitance sensor 61 are described as being of the self-capacitance type, but they are not necessarily limited to this. A mutual capacitance type electrostatic capacitance sensor may also be used. The mutual capacitance type electrostatic capacitance sensor supplies electric charge to one of a pair of electrodes, forms an electric field (generates electrostatic capacitance) between the pair of electrodes via the conductive drum skin 24, and detects a decrease in the electrostatic capacitance between the pair of electrodes, which is caused by the hand H approaching the conductive drum skin 24 so that a part of the electric field moves toward the hand H. In the mutual capacitance type electrostatic capacitance sensor, a pair of electrodes are required to form an electric field, so the pattern of the electrodes or the control circuit becomes complicated. In contrast, in the self-capacitance type electrostatic capacitance sensor 40 and the electrostatic capacitance sensor 61, the electrodes and the control circuit can be simplified.

[0120] In the first embodiment, the drum shell 12 is described as a conductor, but it is not necessarily limited to this. The drum shell 12 may be formed of an insulator such as wood or synthetic resin. The smaller the dielectric constant of the insulator forming the drum shell 12, the smaller the change in electrostatic capacitance detected by the electrostatic capacitance sensor 40 caused by the human body or the like approaching the drum shell 12.

[0121] Furthermore, when the drum case 12 is formed of an insulator, a conductive film may be attached to at least one of the inner and outer peripheral surfaces of the drum case 12, or one of the inner and outer peripheral surfaces of the drum case 12 may be coated with a conductive paint, or a conductive plate may be disposed between each of the electrodes 41, 42, 43 and the drum case 12. By connecting these conductive films, conductive paints, or conductive plates to a reference potential point, the conductive films, conductive paints, or conductive plates function as an electrostatic shielding portion.

[0122] Furthermore, by forming at least a portion of the frame 21 or the frame contact portion 17a, the flange 17c, the cylinder 18c, the bolt 16, and the frame 13 with a conductor and connecting to a reference potential point, the conductor connected to the reference potential point functions as an electrostatic shield.

[0123] In the first embodiment, the drum skin sensor 33 and the drum edge sensor 35 are described as sensors formed by piezoelectric elements, but they are not necessarily limited to this. Of course, vibration sensors formed by elements other than piezoelectric elements can be used. In addition, a drum skin sensor that detects the pressing force from the cushion 34 can also be formed by a pressure sensor such as a membrane switch. In addition, a drum edge sensor can also be formed by a pressure sensor such as a membrane switch, and the membrane switch is configured to be pressed by the elastic deformation of the elastic member 17b of the drum edge 17. Furthermore, the drum skin sensor 33 and the drum edge sensor 35 can also be omitted.

[0124] In the first embodiment, the following situation has been described, that is, when the first differential value of the electrostatic capacitance (detection value) between the hand H and each electrode 41, electrode 42, and electrode 43 exceeds a predetermined threshold value, it is determined that the hand H has touched the drum skin 20 (the distance between the drum skin 20 and the hand H becomes less than 1 mm to 2 mm), but it is not necessarily limited to this. For example, the increase rate of the electrostatic capacitance can be obtained as the difference between the electrostatic capacitance before and after a predetermined time instead of the first differential value of the electrostatic capacitance. In addition, after the electrostatic capacitance increases continuously, when the electrostatic capacitance suddenly increases in a manner that greatly deviates from the continuous increase trend (when the increase trend of the electrostatic capacitance has changed), it can be determined that the hand H has touched the drum skin 20.

[0125] It is also possible to determine that the hand H has touched the drumhead 20 based on the fact that a higher-order differential value such as a second-order differential value or a third-order differential value of the electrostatic capacitance exceeds a predetermined threshold value. The higher-order differential value indicates the manner in which the rate of increase of the electrostatic capacitance increases, and the higher-order differential value also increases suddenly due to the sudden increase in the electrostatic capacitance caused by the provision of the conductive drumhead 24. That is, it can be said that even when using a higher-order differential value, it is possible to determine that the hand H has touched the drumhead 20 based on the rate of increase of the electrostatic capacitance.

[0126] Furthermore, the value of the electrostatic capacitance during the period from when the distance between the drumhead 20 and the hand H becomes less than 1 mm to 2 mm and the hand H contacts the drumhead 20 may be set as a threshold value, and when the electrostatic capacitance exceeds the threshold value, it is determined that the hand H contacts the drumhead 20. In this case, it is possible to prevent the following situation: the rate of increase of the electrostatic capacitance increases due to the movement of the hand H, and the hand H is determined to contact the drumhead 20 even though the hand H is separated from the drumhead 20. Furthermore, a plurality of various conditions for determining that the hand H contacts the drumhead 20 may be combined.

Claims

1. An electronic percussion instrument, characterized in that: include: A cylindrical main body with an open end in the axial direction; A drumhead covering an axial end surface of the main body through the opening and being struck; as well as an electrostatic capacitance sensor disposed on the back side of the drum head and having an electrode; and The drumhead comprises an electrically isolated conductive drumhead, There is no conductor connected to a reference potential point between the surface of the drum head and the electrode.

2. The electronic percussion instrument according to claim 1, characterized in that: The drumhead includes a first drumhead including an insulator and arranged on a surface side of the conductive drumhead.

3. The electronic percussion instrument according to claim 2, characterized in that: include: An annular drum edge is fixed to the outer peripheral side of the main body; and The drumhead comprises: A second drumhead, disposed on the back side of the conductive drumhead, comprising an insulator; as well as The annular frame portion fixes the outer edges of the first drumhead and the second drumhead respectively, and is pressed toward the drum edge to apply tension to the first drumhead and the second drumhead; The conductive drum head is disposed at a position further inward than a contact position between the second drum head and the main body.

4. The electronic percussion instrument according to claim 1, characterized in that: The conductive drum head comprises: A plurality of conductive parts are arranged to extend along a first direction and include conductors; and a non-conductive part, fixing the plurality of conductive parts, comprising an insulator; and The plurality of conductive portions are separated from each other in a second direction orthogonal to the first direction, The electrode is divided into a plurality of electrodes in the second direction so as to be located on both sides of a straight line parallel to the first direction.

5. An electronic percussion instrument, characterized in that: include: A cylindrical main body with an open end in the axial direction; A drumhead covering an axial end surface of the main body through the opening and being struck; An annular drum edge is fixed to the outer peripheral side of the main body; an annular frame portion, fixing the outer edge of the drum skin and being pressed toward the drum edge to apply tension to the drum skin; and an electrostatic capacitance sensor disposed on the back side of the drum head and having an electrode; and The drumhead is provided so that a conductive drumhead is sandwiched between a first drumhead which is an insulator and a second drumhead which is an insulator, so that the conductive drumhead is electrically isolated.

6. The electronic percussion instrument according to claim 5, characterized in that: The conductive drum head is provided with a joint portion that restricts relative displacement of the conductive drum head with respect to the first drum head and the second drum head.

7. The electronic percussion instrument according to claim 5, characterized in that: The conductive drum head has a diameter smaller than an inner diameter of the frame.

8. The electronic percussion instrument according to claim 5, characterized in that: The conductive drum head is disposed at a position further inward than a contact position between the second drum head and the main body.

9. The electronic percussion instrument according to claim 5, characterized in that: The conductive drum skin includes a plain weave mesh material, wherein the plain weave mesh material includes first fibers extending in a first direction and second fibers extending in a second direction orthogonal to the first direction. Each of the second fibers is a fiber constituting a non-conductive portion, Each of the first fibers is a combined fiber of a conductive portion and a non-conductive portion, and the conductive portions are separated from each other in the second direction by disposing the non-conductive portion between adjacent conductive portions.

10. A detection method using an electronic percussion instrument, the electronic percussion instrument comprising an electrically isolated and conductive drumhead and an electrostatic capacitance sensor disposed on the back side of the drumhead, the detection method being characterized in that: Based on the rate of change of the electrostatic capacitance between the electrostatic capacitance sensor and the detected conductor corresponding to the distance between the detected conductor and the drum head, it is determined that the detected conductor is closer to the drum head than a predetermined distance.

11. An electronic percussion instrument, characterized in that: include: The drumhead, including the struck surface, is electrically conductive and electrically isolated; as well as an electrostatic capacitance sensor disposed on the back side of the drum head and generating an electrostatic capacitance corresponding to the distance between the electrostatic capacitance sensor and a detection conductor located on the surface side of the drum head; and The drumhead is provided so that when the detected conductor comes into contact with the drumhead, the drumhead and the detected conductor become electrodes facing the electrode of the electrostatic capacitance sensor.

12. An electronic percussion instrument, characterized in that: include: a drumhead of a struck surface, the drumhead comprising an electrically isolated conductive drumhead; as well as an electrostatic capacitance sensor disposed on the back side of the drum head; and The area of ​​the portion of the conductive drumhead facing the electrode is larger than the area of ​​the hand.

13. An electronic percussion instrument, characterized in that: include: The film-like member, including the struck surface, is electrically conductive and electrically isolated; as well as an electrostatic capacitance sensor disposed on the back side of the film-like member and generating an electrostatic capacitance corresponding to the distance between the electrostatic capacitance sensor and the detection conductor located on the front side of the film-like member; and The film-like member is provided so that when the detected conductor comes into contact with the film-like member, the film-like member and the detected conductor become electrodes facing the electrodes of the electrostatic capacitance sensor.

14. An electronic percussion instrument, characterized in that: include: The drumhead, including the struck surface, is electrically conductive and electrically isolated; a sensor portion for detecting a blow to the drum skin; as well as The electrostatic capacitance sensor is disposed on the back side of the drum head and detects electrostatic capacitance that determines the distance between the electrostatic capacitance sensor and a detection target conductor located on the front side of the drum head.

15. A method for manufacturing an electronic percussion instrument, characterized in that: include: providing a drumhead, the drumhead including a struck surface, being conductive and electrically isolated; Disposing an electrostatic capacitance sensor on the back side of the drum head; in The electrostatic capacitance sensor is configured to detect an electrostatic capacitance corresponding to a distance between the electrostatic capacitance sensor and a detection conductor located on a surface side of the drum head, and The drumhead is provided so that when the detected conductor comes into contact with the drumhead, the drumhead and the detected conductor become electrodes facing the electrode of the electrostatic capacitance sensor.

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