WO2018211741A1

WO2018211741A1 - Electronic drum

Info

Publication number: WO2018211741A1
Application number: PCT/JP2018/001755
Authority: WO
Inventors: 良彰森; 一晃井上
Original assignee: Ａｔｖ株式会社
Priority date: 2017-05-16
Filing date: 2018-01-22
Publication date: 2018-11-22
Also published as: JP2018194631A; JP6283137B1

Abstract

Provided is an electronic drum which makes it possible to improve the accuracy of detection of the first vibration produced directly by striking a head. An electronic drum 100 is provided with an annular hoop 106 on a cylindrical shell 103 that supports a head 101. A sensor support body 120 is provided in a detachable manner on an upper rim of the hoop 106. The sensor support body 120 is formed in the shape of a box that opens to the head 101 side, and is provided with a strike sensor 122 and a shock-absorbing body 123 each in the interior of the sensor support body. The strike sensor 122 is constituted of a light sensor that detects vibration of the head 101. The shock-absorbing body 123 is formed in a cylindrical shape surrounding the entire circumference of the strike sensor 122, and the distal end thereof is in contact with an upper drumhead surface 101a of the head 101. The shock-absorbing body 123 is formed from an elastomer material that is elastic.

Description

Electronic drum

The present invention relates to an electronic drum that generates an electronic musical sound by detecting the impact of a head struck by a hand, a stick or a beater.

Conventionally, there are electronic drums that generate electronic musical sounds by detecting the impact of a head struck with a hand, stick or beater. For example, Patent Document 1 below discloses a snare drum type electronic drum provided with a hitting surface sensor for detecting head vibration at the center of the back surface of the head hit by a player.

JP 2014-130373 A

However, in the electronic drum described in Patent Document 1, the vibration generated by the hitting of the head is reflected by the outer edge portion of the head, so that complicated vibration continues in the head for a long time. In the case of repeated hits, there was a problem that the detection accuracy of the first vibration directly generated by hitting the head was lowered.

The present invention has been made to cope with the above problem, and an object of the present invention is to provide an electronic drum capable of improving the detection accuracy of the first vibration directly generated by hitting the head.

In order to achieve the above object, the present invention is characterized in that a head formed only by a sheet material in which a striking surface to be hit by a player is stretched in a film shape is provided outside the center portion of the head. A tapping sensor that detects vibration generated by tapping the head and outputs a detection signal corresponding to the tapping vibration, and a cylinder that surrounds the outer circumference of the tapping sensor in contact with the head at a position on the center side of the head with respect to the tapping sensor And a shock absorber which is formed in a C shape surrounding at least 1/3 of the outer periphery or the outer periphery and blocks a part of vibration propagating from the central part and propagates the other part. The body is provided only between the central portion and the outer edge portion of the head.

In order to achieve the above object, the present invention is characterized in that a head composed only of a sheet material in which a striking surface to be hit by a performer is stretched in a film shape, and the head is hit by a pedal operation by the performer. A beater that is provided at a position different from the hitting position of the beater in the head, detects a vibration generated by the hitting of the head, and outputs a detection signal corresponding to the vibration. The beater is in contact with the head. It is formed of a bass drum that is formed in a cylindrical shape that surrounds the entire circumference of the tapping sensor without including the tapping position of the tapping sensor, and includes a buffer that blocks a part of vibration propagating from the surroundings and propagates the other part. There is in being.

According to the features of the present invention configured as described above, the electronic drum has a buffer that contacts the head at least one third or the entire circumference of the central portion of the percussion sensor that detects the vibration of the head. Since part of the vibration that is surrounded by the body and propagates from the center side is cut off and the other part is propagated backward, one of the vibrations that propagate from the center side of the head, which is the hitting part, to the tapping sensor side The part is attenuated by the buffer and propagates to the outer edge of the head, and the vibration reflected by the outer edge of the head propagating from the hitting part can also be attenuated by the buffer. Thereby, in the electronic drum according to the present invention, it is possible to improve the detection accuracy of the first vibration directly generated by the hitting of the head. Further, in the electronic drum according to the present invention, the head is composed only of a sheet material stretched in a film shape very close to the head of the acoustic drum, and a tapping sensor and a central portion which is a main tapping portion of the head are provided. By configuring so that no shock absorber is provided, the player is given a tapping feeling closer to the tapping feeling of the head of the acoustic drum, and a stable vibration of the same component is generated regardless of the tapping position, and the propagation of this vibration is also improved. While suppressing the complication, a cylindrical or C-shaped buffer covering the tapping sensor is provided outside the central portion of the film-shaped head so as to face the central portion, thereby sensing vibration. Unnecessary high-frequency components can be attenuated to improve the detection accuracy of the first vibration directly generated by hitting the head. The electronic drum according to the present invention includes an electronic bass drum, a snare drum, a tom tom and a floor tom. Further, the vibration of the head detected by the tapping sensor includes a case where the head is bent and deformed into a convex shape or a concave shape.

Further, according to the feature of the present invention, the electronic drum prevents the propagation of the reflected vibration wave reflected from the edge of the head in all directions when the buffer is configured in a cylindrical shape surrounding the entire circumference of the tapping sensor. can do.

According to another aspect of the present invention, the electronic drum further includes a hoop that protrudes in an annular shape upward from the peripheral edge of the head, and a sensor support that holds the tapping sensor and the shock absorber. The support body is detachably attached to an arbitrary position of the hoop by sandwiching the hoop, and the tapping sensor and the buffer body are arranged to face the hitting surface of the head. According to the other feature of the present invention configured as described above, the electronic drum can take the tapping sensor and the shock absorber to the head with a simple operation, and the performer can be placed at his / her preferred position on the hoop. A sensor support body can be attached and a sensor support body can be provided in the position which does not become an obstacle of performance.

According to another aspect of the present invention, the electronic drum further includes a shell formed in a cylindrical shape and having one end closed by the head, and a tapping sensor, a shock absorber, and a tapping sensor detection signal. A sensor support for holding each of the phone terminals. The sensor support is attached to the inner peripheral surface of the shell with the phone terminal exposed on the outer peripheral surface of the shell, and the tapping sensor and the shock absorber are attached to the head of the head. It is to be arranged opposite to the surface. According to another aspect of the present invention configured as described above, the electronic drum can prevent the sensor support 401 from being an obstacle to performance by disposing the sensor support in the shell, and can be aesthetically pleasing to the electronic drum. Can be improved. In addition, since the tapping sensor, buffer body, and phone terminal are integrally provided on the sensor support body of the electronic drum, the tapping sensor and buffer body can be attached to the head with a simple operation and the phone terminal is exposed to the shell. It can be attached in the state of being let.

Another feature of the present invention is that, in the electronic drum, the tapping sensor optically detects the deflection deformation of the head.

According to another feature of the present invention configured as described above, since the electronic drum can detect the bending deformation of the head, in addition to the normal performance method of hitting the head with a beater by one hitting sensor, the beater It is possible to express the difference in timbre by detecting the closed performance method in which the head is pressed and the open performance method in which the beater is released immediately after hitting. Further, the tapping sensor is configured by a non-contact type sensor that optically detects head vibration, so that vibration can be detected with higher accuracy than the contact type sensor even when the vibration is attenuated by the buffer. .

Another feature of the present invention is that, in the electronic drum, the buffer body is formed thick in a direction away from the head.

According to another aspect of the invention configured as described above, in the electronic drum, in the buffer, the thickness of the distal end portion on the side in contact with the head is thinner than the thickness of the proximal end portion on the side opposite to the distal end portion. Because it is formed, it can accurately follow the vibration of the head to suppress the vibration absorption and the player's feeling of tapping, and the base end has a thick thickness to cushion it. The rigidity of the body can be increased and the vibration absorption and durability can be improved.

Further, in these cases, in the electronic drum, the buffer body can be constituted by a dark color at least on the tapping sensor side. In this case, the dark color is a color that hardly reflects light, such as dark red, dark blue, dark brown, or dark purple, similar to black or black. According to this, since the electronic drum has a dark color on at least the tapping sensor side of the buffer body, the detection accuracy can be improved by suppressing the influence of external light in the tapping sensor that optically detects vibration. .

In these cases, in the electronic drum, the tapping sensor and the shock absorber can be integrally formed and provided on the striking surface side. According to this, since the tapping sensor and the buffer body are integrally configured and provided on the striking surface side, the electronic drum can facilitate assembly work and maintenance work.

The electronic drum is provided with a head constituting a hitting surface to be hit by the performer, and a detection signal corresponding to the vibration by detecting vibration generated by hitting the head provided outside the center of the head. A tapping sensor for output and vibration that is provided in contact with the head at a position on the center side of the head with respect to the tapping sensor and that propagates from the center portion facing at least one third of the outer periphery of the tapping sensor. And a buffer for propagating the other part and blocking the other part. The electronic drum has a head that forms a hitting surface to be hit by the performer, and a hitting that is provided at the center of the head and detects a vibration generated by the hitting of the head and outputs a detection signal corresponding to the vibration. A sensor and a buffer that surrounds the entire circumference of the tapping sensor in contact with the head and blocks a part of the vibration propagating from the surroundings and propagating the other part can be configured.

It is a perspective view showing the outline of the appearance composition of the electronic drum concerning one embodiment of the present invention. It is the top view which showed the outline of the external appearance structure of the electronic drum shown in FIG. It is sectional drawing which shows the outline of the internal structure of the electronic drum seen from the 3-3 line shown in FIG. It is sectional drawing which shows the outline of the internal structure of the electronic drum which concerns on the modification of this invention. It is the top view which showed the outline of the external appearance structure of the electronic drum which concerns on the other modification of this invention. FIG. 6 is a cross-sectional view showing an outline of the internal configuration of the electronic drum as seen from line 6-6 shown in FIG. It is sectional drawing which shows the outline of the internal structure of the electronic drum which concerns on the other modification of this invention. It is a perspective view which shows the outline of a sensor support body external appearance structure with which the electronic drum shown in FIG. 7 is provided. It is sectional drawing which shows the outline of the internal structure of the electronic drum which concerns on the other modification of this invention.

Hereinafter, an embodiment of an electronic drum according to the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing an outline of an external configuration of an electronic drum 100 according to the present invention. 2 is a plan view showing an outline of the external configuration of the electronic drum 100 shown in FIG. FIG. 3 is a cross-sectional view showing an outline of the internal configuration of the electronic drum 100 as viewed from line 3-3 shown in FIG. Note that the drawings referred to in this specification are schematically shown by exaggerating some of the components in order to facilitate understanding of the present invention. For this reason, the dimension, ratio, etc. between each component may differ. The electronic drum 100 is a snare drum type electronic percussion instrument that generates an electronic musical tone by detecting the impact of a hitting surface 101a hit by a performer (not shown) via a stick (not shown).

(Configuration of electronic drum 100)
The electronic drum 100 includes a head 101. The head 101 is a component that vibrates and elastically deforms when hit by a stick operation by a player, and is configured by forming a cloth material or a resin material into a sheet shape or a thin plate shape. Specifically, the head 101 is composed of a transparent or translucent resin sheet material or thin plate material, or a cloth material or resin material formed in a mesh shape. In the present embodiment, the head 101 is configured by forming a mesh-like sheet body into a circle in a plan view. The outer edge of the head 101 is held by a head frame 102.

The head frame 102 is a component for arranging the head 101 on the shell 103 in a tensioned state, and is configured by forming a metal material or a resin material in an annular shape. The head frame 102 is fitted to the outer periphery of the shell 103 while holding the outer edge of the head 101. In this case, the upper surface of the head frame 102 is pressed by the hoop 106.

The shell 103 is a component that supports the head 101, and is configured by forming a metal material, a resin material, or wood into a cylindrical shape. One end (upper side in the figure) of the shell 103 is closed by the head 101, and the other end (lower side in the figure) is closed by the shell cover 110. Thus, in the head 101, the surface exposed to the outside of the shell 103 constitutes the striking surface 101a, and the surface facing the inside of the shell 103 constitutes the back surface 101b. On the outer peripheral surface of the shell 103, a lug 104, a cover lug 105, and a main body fixture 108 are provided.

The lug 104 is a part for pressing the hoop 106 against the upper surface of the head frame 102, and is provided in a state of overhanging on the outer peripheral surface of the shell 103. More specifically, the lug 104 is composed of a metal block body extending in the axial direction in a state of projecting outward in the radial direction of the shell 103, and an end surface of the block body on the head frame 102 side (the upper side in the drawing). A female screw (not shown) is formed in a hole extending in the axial direction of the shell 103. That is, the lug 104 fixedly supports the hoop 106 by the tension bolt 107 penetrating the hoop 106 being screwed into the female screw.

In addition, the lug 104 has two cylindrical boss portions (not shown) that fit on the side surface of the shell 103 on the surface facing the shell 103, and the sensor support 120 is inserted through the boss portion. It is supported. In the present embodiment, eight lugs 104 are formed at substantially equal intervals along the circumferential direction of the shell 103 in the present embodiment.

Similarly to the lug 104, the cover lug 105 is a part for pressing a later-described cover hoop 112 against the upper surface of the cover frame 111, and is provided in a state of protruding on the outer peripheral surface of the shell 103. More specifically, the cover lug 105 is composed of a metal block body that extends in the axial direction in a state of projecting outward in the radial direction of the shell 103, and is formed on an end surface of the block body on the cover frame side (the upper side in the drawing). A female screw (not shown) is formed in a hole extending in the axial direction of the shell 103. In the present embodiment, eight cover lugs 105 are formed at positions adjacent to the lugs 104 at substantially equal intervals along the circumferential direction of the shell 103.

The hoop 106 is a component for pushing the upper surface of the head frame 102 to stretch the head 101 on the shell 103, and is configured by forming a metal material into a stepped cylindrical shape. More specifically, the hoop 106 has one end (upper side in the drawing) extending from the upper surface of the head 101 so as to protrude upward in the drawing, and the other (lower side in the drawing) is projecting radially outward to the head frame. It is formed in a cylindrical shape covering the outer surface of 102. A sensor support 120 described later is provided on the upper portion of the hoop 106. The hoop 106 is attached to the lug 104 via a tension bolt 107 at a portion projecting radially outward on the other end side. The annular upper end of the hoop 106 is a rim that is hit by the player.

The tension bolt 107 is a part for pressing the hoop 106 against the upper surface of the head frame 102, and is composed of a bolt having a male screw formed on the outer periphery of a metal shaft. The tension bolt 107 is fastened to the female screw portion of the lug 104 in a state where the tension bolt 107 penetrates a portion where the outer diameter of the hoop 106 protrudes. As a result, the head 101 is pressed against the end of the shell 103 by the head frame 102 being pulled toward the lug 104 and is stretched into a flat film shape.

The main body fixture 108 is a component for attaching the electronic drum 100 to a stand (not shown), and has a female block (not shown) extending in the axial direction of the shell 103 on a metal block body. Has been.

The shell cover 110 is a component for covering the opposite side of the shell 103 to the head 101 side, and is configured by forming a cloth material or a resin material into a sheet shape or a thin plate shape. In the present embodiment, the shell cover 110 is configured by forming a mesh-like sheet body in a circular shape in plan view, like the head 101. The outer edge of the shell cover 110 is held by a cover frame 111.

Similar to the head frame 102, the cover frame 111 is a component for placing the shell cover 110 on the shell 103 in a tensioned state, and is configured by forming a metal material or a resin material in an annular shape. . The cover frame 111 is fitted to the outer peripheral portion of the shell 103 while holding the outer edge portion of the shell cover 110. In this case, the cover frame 111 has an annular lower surface pressed by the cover hoop 112.

Similar to the hoop 106, the cover hoop 112 is a part for pushing the lower surface of the cover frame 111 to stretch the shell cover 110 on the shell 103, and is configured by forming a metal material into a stepped cylindrical shape. . More specifically, the cover hoop 112 has one end (the lower side in the figure) extending from the lower surface of the shell cover 110 so as to protrude downward in the figure, and the other end (the upper side in the figure) projecting radially outward. It is formed in a cylindrical shape that covers the outer surface of the cover frame 111. The cover hoop 112 is attached to the cover lug 105 via a cover tension bolt 113 at a portion projecting radially outward on the other end side.

Similar to the tension bolt 107, the cover tension bolt 113 is a part for pressing the cover hoop 112 against the lower surface of the cover frame 111. The cover tension bolt 113 is a bolt having a male shaft formed on the outer periphery of a metal shaft. Has been. The cover tension bolt 113 is fastened to the female screw portion of the cover lug 105 in a state of passing through a portion where the outer diameter of the cover hoop 112 protrudes. As a result, the shell cover 110 is pressed against the end of the shell 103 by the cover frame 111 being pulled toward the cover lug 105 and is in a state of being stretched into a flat film.

The sensor support 120 is a rigid part made of a resin material or a metal material that holds the tapping sensor 122, the buffer body 123, and the phone terminal 124, respectively, and extends in the radial direction of the head 101 (on the lower side in the drawing). It is formed in the shape of a box that is open toward. The sensor support 120 is formed with a notch 120a into which the hoop 106 is inserted at the center of the portion extending in the radial direction of the head 101. The tapping sensor 122 is located on the head 101 side with respect to the notch 120a. And a buffer 123 and a phone terminal 124 and a mounting bolt 121 on the outside of the head 101 with respect to the notch 120a.

The mounting bolt 121 is a part for detachably mounting the sensor support 120 to the upper end portion of the hoop 106, and is composed of a male male screw. The mounting bolt 121 is screwed to the side wall of the sensor support 120 and is screwed into the side wall to hold the upper end portion of the hoop 106 between the side wall of the notch 120a.

The tapping sensor 122 is a detector for optically detecting the vibration of the head 101, and outputs a detection signal including an electric signal corresponding to the vibration of the head 101 to the phone terminal 124. In the present embodiment, the tapping sensor 122 includes a light emitting element (not shown) that emits light toward the hitting surface 101a and a light receiving element (not shown) that outputs an electrical signal corresponding to the amount of received light. For example, a phototransistor). The tapping sensor 122 is fixedly provided on the back surface of the sensor support 120 facing the hitting surface 101a.

Thereby, the tapping sensor 122 is positioned on the outer edge side between the central portion S and the outer edge portion of the head 101. Here, the central portion S of the head 101 is a portion where the performer mainly strikes the stick, and has a diameter of 1/3 to 1/2 of the diameter of the head 101 with the center of the head 101 as the center. The range of the circle. In FIG. 2, the central portion S is indicated by a two-dot chain line.

The buffer 123 is a component that propagates while attenuating part of the vibration of the head 101 in contact with the head 101, and is made of an elastomer material having elasticity that follows the vibration of the head 101. Here, the elastomer material is a rubber material or a resin material having elasticity to follow the vibration of the head 101, and more specifically, a thermosetting elastomer material (for example, vulcanized rubber, urethane rubber, silicone rubber, Fluoroelastomer) and thermoplastic elastomer materials (for example, styrene-based, olefin-based, vinyl chloride-based, urethane-based or amide-based resins). In other words, the buffer body 123 is configured to have elasticity that can attenuate a part of vibration propagating on the head 101 and attenuate and / or reflect part of the vibration to propagate the other part. . In the present embodiment, the buffer body 123 is made of a low-resilience urethane foam material having a resilience modulus of 50% or less.

The buffer body 123 is formed in a cylindrical shape that covers the perimeter of the tapping sensor 122. In the present embodiment, the buffer body 123 is formed in a cylindrical shape. In this case, the inner diameter of the buffer body 123 may be at least large enough to detect the vibration of the head 101 by the tapping sensor 122. The length of the buffer 123 is formed such that the back surface of the sensor support 120 provided with the tapping sensor 122 contacts the hitting surface 101a.

Further, the thickness of the buffer body 123 is formed so that the thickness decreases from the base end portion which is the back surface side of the sensor support body 120 toward the tip end portion side which contacts the hitting surface 101a. In this case, the thickness of the buffer 123 is appropriately set according to the size of the head 101, but is preferably 2 mm or more and 30 mm or less. Furthermore, the whole buffer body 123 is formed in black. This shock absorber 123 absorbs and / or reflects a part of the vibration propagating on the head 101 so as to be attenuated and propagate the other part with a pressing force enough to propagate the other part. The sensor support 120 is fixed to the back surface of the sensor support 120 with an adhesive while being pressed against 101a.

The phone terminal 124 is used for detachably connecting the tapping sensor 122 and the signal processing device via a signal cable (not shown) in order to output the detection signal output from the tapping sensor 122 to an external device such as a signal processing device. This is a jack-type interface part. The phone terminal 124 is attached to the sensor support 120 in a state of being exposed on the side surface of the sensor support 120.

Here, the signal processing device includes a microcomputer provided separately from the electronic drum 100, and is an electronic circuit that outputs a musical sound signal based on a detection signal output from the tapping sensor 122, that is, It is a sound source. An external speaker (not shown) is connected to this signal processing device.

(Operation of electronic drum 100)
Next, the operation of the electronic drum 100 configured as described above will be described. First, the performer prepares the electronic drum 100, a signal processing device (not shown), and an external speaker (not shown), and then electrically connects the electronic drum 100 and the signal processing device and performs signal processing. The apparatus and the external speaker are electrically connected.

Next, the performer adjusts the position of the sensor support 120 and the contact pressure state of the buffer 123 to the head 101, respectively. Specifically, the performer adjusts the position of the sensor support 120 on the hoop 106 and the contact pressure of the buffer 123 with respect to the head 101 by loosening the screw fitting of the mounting bolt 121 on the sensor support 120. . In this case, the performer can attach the sensor support 120 to his / her preferred position on the hoop 106. Thus, the performer can provide the sensor support 120 at a position that does not hinder performance.

Also, the performer adjusts the vertical position of the sensor support 120 to adjust the pressure at which the buffer 123 contacts the striking surface 101a of the head 101 to his or her favorite pressure. That is, the player can increase the amount of vibration attenuation of the hitting surface 101a by strongly bringing the tip of the shock absorber 123 into contact with the hitting surface 101a, and weakens the tip of the shock absorber 123 to the hitting surface 101a. By making contact, the amount of vibration attenuation of the hitting surface 101a can be reduced.

Next, the performer sets the performance mode in which the signal processing device can be operated by turning on the power of the signal processing device and then operating the signal processing device. In this case, the tapping sensor 122 of the electronic drum 100 is supplied with electric power from the signal processing device, and the light emitting element starts to emit light. In this case, the emitted light emitted from the light emitting element is reflected by the striking surface 101a of the head 101 and part thereof is guided to the light receiving element. That is, the tapping sensor 122 continuously outputs a detection signal corresponding to the amount of reflected light from the head 101 to the signal processing device. Thereby, the electronic drum 100 becomes a state which can output a musical sound from a speaker via a signal processing apparatus.

Next, the performer starts playing the electronic drum 100. Specifically, the performer strikes the hitting surface 101a of the head 101 using a stick or the like. Thus, in the electronic drum 100, the head 101 vibrates according to the performance operation by the performer, and the tapping sensor 122 outputs a detection signal corresponding to the vibration of the head 101 to the signal processing device. In this case, the vibration propagated to the buffer body 123 is attenuated by the buffer body 123 and propagates to the head 101 inside the buffer body 123. In this case, the buffer 123 mainly absorbs high frequency components in the propagated vibration.

Therefore, the tapping sensor 122 processes a detection signal based on the vibration attenuated by the buffer 123, that is, a detection signal having a smaller output and a lower high-frequency component than the detection signal due to the vibration when the buffer 123 is not provided. Output to the device. In this case, the tapping sensor 122 detects the vibration of the head 101 without being affected by external light because the buffer 123 completely covers the perimeter of the tapping sensor 122 and the inner peripheral surface is black. Thus, a detection signal can be output.

Thereby, the signal processing device generates a musical tone signal corresponding to the detection signal input from the tapping sensor 122 and outputs it to the external speaker. In this case, even if the output value of the detection signal is slightly reduced by the buffer body 123, the signal processing device mainly uses a low frequency component for the first vibration due to the tapping, and the vibration is not greatly attenuated by the buffer body 123. Can be accurately detected. Therefore, the external speaker generates a tone corresponding to the hit by the performer.

On the other hand, the vibration generated by hitting the head 101 spreads concentrically around the hit portion and propagates, then reflects off the outer edge of the head 101 and part of the vibration propagates again to the buffer 123. In this case, the buffer body 123 is generated not only by vibrations primarily reflected by the outer edge portion of the head 101 but also by vibrations secondarily or tertiaryly reflected by the outer edge portion of the head 101 and by the next tapping by the player. Each vibration propagates. Therefore, the buffer body 123 attenuates each propagated vibration. Thereby, the tapping sensor 122 outputs a detection signal based on each vibration attenuated by the buffer body 123 to the signal processing device as described above.

Even in this case, since the vibration reflected by the outer edge portion of the head 101 is attenuated by the buffer 123, the signal processing apparatus can prevent erroneous detection of the hit due to the reflected vibration and perform the next hit by the performer. It can be detected accurately.

Next, when the performer finishes the performance, the power source of the signal processing device is turned off, and then the electrical connection between the electronic drum 100 and the signal processing device is canceled, and the signal processing device and the external speaker are removed. And eliminate the electrical connection. Thereby, the performer can end the performance of the electronic drum 100.

As can be understood from the above description of the operation, according to the above embodiment, the electronic drum 100 is centered by surrounding the entire circumference of the tapping sensor 122 that detects the vibration of the head 101 with the buffer 123 that contacts the head 101. Since part of the vibration propagating from the part side is cut off and the other part is propagated backward, a part of the vibration propagating from the central part S side of the head 101 serving as the tapping part to the tapping sensor 122 side is Vibration attenuated by the buffer body 123 and propagated to the outer edge portion of the head 101 and also reflected by the outer edge portion of the head 101 propagated from the hitting portion side can be attenuated by the buffer body 123. Thereby, in the electronic drum 100 according to the present invention, it is possible to improve the detection accuracy of the first vibration directly generated by the hit of the head 101. In the electronic drum 100, the head 101 is composed only of a sheet material stretched in a film shape very close to the head of the acoustic drum, and the tapping sensor 122 and the central portion S which is the main tapping portion of the head 101 are provided. By configuring so that the shock absorber 123 is not provided, the player feels a tapping feeling closer to the tapping feeling of the head of the acoustic drum, generates a stable vibration of the same component regardless of the tapping position, and propagates this vibration. On the other hand, vibration sensing is provided by providing a cylindrical buffer body 123 that covers the tapping sensor 122 in a state facing the central portion S outside the central portion S with respect to the film-like head 101. It is possible to improve the accuracy of detection of the first vibration directly generated by hitting the head 1-1 by attenuating unnecessary high frequency components. Kill.

Furthermore, the implementation of the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the object of the present invention. In the following modifications, the same reference numerals are given to the same components as those in the above embodiment, and the description thereof is omitted.

For example, in the above-described embodiment, the tapping sensor 122 is a non-contact sensor made of an optical sensor. However, the tapping sensor 122 is not necessarily a non-contact sensor as long as the vibration of the head 101 can be detected. That is, the tapping sensor 122 can be configured with a contact sensor. For example, the electronic drum 200 shown in FIG. 4 includes a piezoelectric element in which the tapping sensor 122 has electrodes disposed on both sides of the piezoelectric ceramic and a metal plate is disposed on one of these electrodes. In this case, the tapping sensor 122 is fixed to the back surface of the sensor support 120 with respect to the head 101 via the cushion body 201.

The cushion body 201 is a component for accurately transmitting vibration to the tapping sensor 122 while protecting the tapping sensor 122 from vibration of the head 101, and is configured by forming a rubber material or a resin material having elasticity into a truncated cone shape. Has been. In this case, the cushion body 201 has a small-diameter tip portion pressed against the striking surface 101a of the head 101, and a tapping sensor 122 is attached to a large-diameter lower surface portion via a double-sided tape or an adhesive (not shown).

In the above embodiment, the buffer 123 is formed in a cylindrical shape surrounding the entire circumference of the tapping sensor 122. However, the buffer 123 is provided on the center S side of the head 101 with respect to the tapping sensor 122 in contact with the head 101 and is formed to face at least one third of the outer periphery of the tapping sensor. That's fine. In other words, the buffer body 123 only needs to be formed extending in a direction intersecting with a straight line connecting the center of the central portion S of the head 110 and the tapping sensor 122. The buffer body 123 can be formed in an arc shape, a flat plate shape, a polygonal cylindrical shape, or an elliptical cylindrical shape. For example, the buffer 123 can be formed in an arc shape that is curved in a convex shape with a portion intersecting a straight line connecting the center of the central portion S of the head 110 and the tapping sensor 122 as a vertex and surrounds the tapping sensor 122.

Further, for example, in each of the electronic drums 300 shown in FIGS. 5 and 6, the buffer body 301 has a C-shaped cross section that swells in an arc shape that is convex with respect to the central portion S of the head 101. That is, the buffer 301 is open to the outer edge side of the head 101. According to this, since the vibration propagating from the central portion S side of the head 101 to the buffer body 123 is attenuated by the buffer body 301 and propagates to the outer edge portion of the head 101, the vibration reflected by the outer edge portion is reduced. Can do. In FIG. 5, the central portion S is indicated by a two-dot chain line.

In the above-described embodiment, the buffer body 123 is formed such that the thickness of the tip portion contacting the head 101 is thinner than the base end portion on the sensor support body 120 side. However, the thickness of the buffer 123 may be a constant thickness from the base end portion to the tip end portion, or the base end portion may be formed thinner than the tip end portion. Moreover, the buffer 123 can also provide an opening between a base end part and a front-end | tip part.

In the above embodiment, the buffer body 123 is entirely black. Thereby, the buffer 123 can improve the detection accuracy of the vibration of the tapping sensor 122 made of an optical sensor. However, the buffer body 123 can be expected to have the same effect as long as at least the inner peripheral surface is composed of a dark color. The tapping sensor 122 can detect vibration even if the buffer 123 is a color other than dark. Therefore, the buffer 123 can also be configured in a color other than a dark color, for example, a light color such as white or gray.

In the above embodiment, the buffer body 123 is configured to come into contact with the head 101. However, the buffer 123 can be fixed to the head 101 with an adhesive or the like. According to this, the buffer 123 can follow the vibrating head 101 with high accuracy.

In the above embodiment, the buffer 123 is made of an elastomer material. However, the buffer 123 only needs to be configured to absorb and / or reflect and block a part of vibration propagating on the head 101 and to propagate the other part. In addition to a winding spring or a leaf spring made of a resin material and a bellows (bellows), it can also be made of a resin material made of a hard or rigid body that does not elastically deform, a wood material, or a metal material. It should be noted that the elasticity and hardness of the buffer 123 and the degree of the pressing force to the head 101 are experimentally selected in advance so as to block a part of vibration propagating on the head 101 and propagate another part. .

In the above embodiment, the tapping sensor 122 and the buffer 123 are integrally configured by being attached to the sensor support 120 made of a rigid body. However, the tapping sensor 122 and the buffer body 123 can also be configured separately by being attached to different parts.

In the above embodiment, the tapping sensor 122 and the buffer 123 are configured to be detachable from the hoop 106 through the sensor support 120. However, the tapping sensor 122 and the shock absorber 123 can be provided directly or indirectly on parts other than the hoop 106, for example, the lug 104 or the shell 103, and are fixed to these parts including the hoop 106 or It can also be provided detachably.

In the above embodiment, the tapping sensor 122 and the buffer body 123 are provided above the head 101. However, the tapping sensor 122 and the buffer 123 can be provided below the head 101. For example, in the electronic drum 400 shown in each of FIGS. 7 and 8, the tapping sensor 122, the buffer 123, and the phone terminal 124 are attached to a sensor support 401 formed in a box shape that opens toward the inner peripheral surface of the shell 103. It is prepared for. In this case, the sensor support 401 is attached to the inner peripheral surface of the shell 103 with a screw (not shown) with the phone terminal 124 exposed on the outer peripheral surface of the shell 103.

Thus, the tapping sensor 122 and the buffer body 123 are provided in a state where the tapping sensor 122 is disposed opposite to the back surface 101b of the head 101 and the buffer body 123 is in contact with the back surface 101b of the head 101. According to this, since the sensor support 401 is accommodated in the shell 103, the electronic drum 400 can prevent the sensor support 401 from obstructing performance and improve the aesthetics of the electronic drum 100. it can.

Further, in the above embodiment, the tapping sensor 122 and the buffer body 123 are disposed between the central portion S and the outer edge portion of the head 101. However, the tapping sensor 122 and the buffer 123 can be provided in the central portion S of the head 101 if the buffer 123 is formed in a cylindrical shape surrounding the entire circumference of the tapping sensor 122. In this case, the tapping sensor 122 and the buffer body 123 are supported on a member laid in the radial direction inside the shell 103 and disposed on the back surface 101 b side of the head 101.

In the above embodiment, the electronic drum 100 is a snare drum type. However, the electronic drum 100 can be composed of an electronic bass drum, snare drum, tom tom, floor tom, and the like. For example, an electronic drum 500 shown in FIG. 9 is a bus having a head 502, a head frame 503, and a hoop 504 attached to a cylindrical shell 501, and a beater 506 that operates the head 502 with a pedal 505 in front of the head 502. Consists of drums. In this case, beater 506 strikes slightly above the center of head 502. In FIG. 9, the state where the beater 506 strikes the striking surface 502a of the head 502 is indicated by a two-dot chain line.

In the electronic drum 500, a disk-like support base 507 is attached to the inside of the shell 501 in a posture parallel to the head 502, and a sensor base 508, a buffer 510 and a phone terminal 511 are respectively attached to the support base 507. It is attached. The sensor base 508 supports the tapping sensor 509 so as to face a position separated from the head 502. The tapping sensor 509 is an optical sensor that detects the vibration of the head 502 and is disposed at the center of the head 502 below the tapping position of the beater 506.

The buffer 510 is formed of an elastomer cylinder surrounding the sensor base 508, and is fixed on the support base 507 in contact with the head 502. In this case, the buffer 510 is formed of a cylindrical body having a constant inner diameter and outer diameter. Further, although the buffer 510 is disposed below the hitting position of the beater 506, it may be formed in a cylindrical shape having an inner diameter including the hitting position. The phone terminal 511 is an interface for outputting a detection signal output from the tapping sensor 509 to the signal processing device.

In the electronic drum 500 configured as described above, the same effect as that of the electronic drum 100 can be expected. In the electronic drum 500, in addition to a normal performance method of hitting the head 502 with the beater 506, a closed performance method in which the head 502 is pressed by the beater 506 to perform and an open performance method in which the beater 506 is released immediately after the hitting are detected. Can express differences in timbre. In other words, the tapping sensor 509 and the tapping sensor 122 can detect not only the vibration of the head 502 and the head 101 but also the bending deformation.

In the above embodiment, the electronic drum 100 is configured such that the shell cover 110 is not snapped. However, the electronic drum 100 may be configured with a snappy attached to the shell cover 110. In this case, since the snappy vibrates vigorously when the player hits the head 101, the vibration of the head 101 becomes large and long, but the erroneous detection of the hit can be effectively prevented by the attenuation of the vibration by the buffer 123.

S ... the center of the head,
100, 200, 300, 400, 500 ... electronic drum,
DESCRIPTION OF SYMBOLS 101 ... Head, 101a ... Hitting surface, 101b ... Back surface, 102 ... Head frame, 103 ... Shell, 104 ... Lug, 105 ... Cover lug, 106 ... Hoop, 107 ... Tension bolt, 108 ... Main body fixture,
110 ... Shell cover, 111 ... Cover frame, 112 ... Cover hoop, 113 ... Cover tension bolt,
DESCRIPTION OF SYMBOLS 120 ... Sensor support body, 120a ... Notch, 121 ... Mounting bolt, 122 ... Tapping sensor, 123 ... Buffer body, 124 ... Phone terminal,
201 ... cushion body,
301 ... buffer,
401 ... sensor support,
501 ... shell, 502 ... head, 502a ... hitting surface, 503 ... head frame, 504 ... hoop, 505 ... pedal, 506 ... beater, 507 ... support base, 508 ... sensor base, 509 ... tapping sensor, 510 ... buffer, 511: Phone terminal.

Claims

A head composed only of a sheet material in which a striking surface struck by a performer is stretched in a film shape;
A tapping sensor that is provided outside the center of the head and detects a vibration generated by tapping the head and outputs a detection signal corresponding to the vibration;
A cylindrical shape surrounding the outer periphery of the tapping sensor or a C-shape surrounding at least one third of the outer periphery of the tapping sensor at a position on the center side of the head with respect to the tapping sensor. A buffer that blocks a part of the vibration propagating from the central portion and propagates the other part;
The tapping sensor and the buffer are:
An electronic drum provided only between a central portion and an outer edge portion of the head.
The electronic drum according to claim 1, further comprising:
A hoop projecting in an annular shape upward from the peripheral edge of the head;
A sensor support for holding the tapping sensor and the buffer, respectively.
The sensor support is
An electronic drum, wherein the tapping sensor and the cushioning body are disposed to face the striking surface of the head by being detachably attached to an arbitrary position of the hoop by sandwiching the hoop.
The electronic drum according to claim 1, further comprising:
A shell formed in a cylindrical shape and having one end closed by the head;
A sensor support for holding each of the tapping sensor, the buffer, and a phone terminal that outputs a detection signal of the tapping sensor;
The sensor support is
An electronic drum, wherein the phone terminal is exposed on the outer peripheral surface of the shell, is attached to the inner peripheral surface of the shell, and the tapping sensor and the shock absorber are arranged to face the hitting surface of the head.
A head composed only of a sheet material in which a striking surface struck by a performer is stretched in a film shape;
A beater that strikes the head by a pedal operation by the performer;
A tapping sensor that is provided at a position different from the beating position of the beater in the head and detects a vibration caused by the tapping of the head and outputs a detection signal corresponding to the vibration;
It is formed in a cylindrical shape that surrounds the entire circumference of the tapping sensor without including the hitting position of the beater in contact with the head, and blocks a part of the vibration propagating from the surroundings and transmits the other part. An electronic drum comprising a bass drum provided with a buffer.
The electronic drum according to claim 4,
The tapping sensor is
An electronic drum characterized by optically detecting deflection deformation of the head.
The electronic drum according to any one of claims 1 to 5,
The buffer is
An electronic drum, wherein the thickness of the electronic drum is increased in a direction away from the head.