JP4380611B2 - Drum head - Google Patents

Description

  The present invention relates to a drum head for a percussion instrument.

For example, there are inventions disclosed in Patent Document 1 and Patent Document 2 as inventions of percussion instruments that can obtain a hit feeling similar to that of an acoustic drum while suppressing the hitting sound at the time of hitting.
The percussion instrument disclosed in Patent Document 1 includes a net-like material obtained by laminating a first net and a second net woven by plain weave so that their weave directions are oblique to each other as a drum head. In the percussion instrument disclosed in Patent Document 1, when the drum head is struck with a stick, air passes through the opening of the mesh of the mesh material, so that the percussion sound when the drum head is struck becomes small.
On the other hand, the percussion instrument disclosed in Patent Document 2 includes a punching sheet having a large number of opening holes as a drum head. In the percussion instrument disclosed in Patent Document 2, when the drum head is hit with a stick, the propagation of the vibration of the drum head to the air is reduced by a large number of opening holes, so that the hitting sound is reduced. In addition, since the punching sheet has a large rebound of the stick at the time of striking compared to the net-like drum head, it is possible to obtain a striking feeling close to that of a normal acoustic drum.
Japanese Patent Laid-Open No. 10-20854 JP 2001-142459 A

  By the way, since the drum head is a consumable item, it must also have durability. In order to improve the durability of the drum head in the percussion instrument disclosed in Patent Document 1, it is conceivable to shorten the distance between the fibers of the plain weave. However, if the distance between the fibers is shortened, the opening becomes narrower. There arises a problem that the silencing performance is deteriorated. In order to improve the durability of the drum head in the electronic musical instrument disclosed in Patent Document 2, it is conceivable to increase the thickness of the punching sheet. However, if the punching sheet is made thick, the rigidity of the drum head stretched on the body becomes high and the sinking of the stick tip into the head is small, so that the hit feeling is similar to hitting a plate. As a result, a good feeling of hitting cannot be obtained.

  The present invention has been made under the above-described background, and an object thereof is to provide a drum head that has durability and sound deadening properties and can obtain a good hitting feeling.

In order to solve the above-described problems, the present invention provides a drum head that is stretched around the opening end of a drum body that is hollow and has an opening end, and a plurality of elastic films are stacked. A plurality of through-holes penetrating all the layers of the film, and the density of the through-holes is different between the central portion of the open end and the peripheral portion of the open end, and the density of the through-hole is the center of the open end towards the periphery of the open end than parts to provide a tight der Ru drumhead.

  According to the present invention, durability, silence, and good impact feeling are imparted to the drum head.

[First Embodiment]
Hereinafter, a percussion instrument according to a first embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is an external view of a percussion instrument 1 according to an embodiment of the present invention, and FIG. As shown in FIG. 1, the percussion instrument 1 includes a cylindrical body 10 and a drum head 30. As shown in FIG. 1, a lug case 20 is fixed to the outer peripheral surface of the cylindrical body 10 with a predetermined interval in the circumferential direction of the body 10 with screws. As shown in FIG. 2, the lug case 20 has a lug nut 22 with one end exposed to the outside through a hole provided in the lug case 20, and the lug nut 22 is urged in a direction protruding outward. A spring 23 is accommodated. The lug nut 22 is formed in a cylindrical shape, and a flange 22a for preventing removal is integrally provided on the outer peripheral surface. A screw hole into which the lug bolt 24 is screwed is formed in the center of the lug nut 22.

  The outer periphery of the drum head 30 is held by a head frame 31. When the fastening frame 32 provided on the outer periphery of the drum head 30 and the lug nut 22 are connected by the lug bolt 24 and the fastening frame 32 is pressed against the head frame 31 by the fastening operation of the lug bolt 24, tension is applied to the drum head 30. The drum head 30 is stretched around the opening end of the body 10.

  The drum head 30 is formed by laminating three layers of polyethylene terephthalate films as shown in the enlarged upper right part of FIG. 2, and the layers of the films are simply stacked. As shown in FIGS. 1 and 2, the drum head 30 is provided with a large number of through holes having a diameter of 0.5 mm to 3 mm, and the opening ratio (hole area / total area of the drum head) is 20. % To less than 50%. Note that opening a hole with a diameter of 0.5 mm or less requires a high level of processing technology and is costly. In this embodiment, the diameter of the through hole is set to 0.5 mm or more. If the diameter is 3 mm or more, the stick enters the through hole, and the drum head may be broken by the stick. Therefore, in the present embodiment, the diameter of the through hole is 3 mm or less. In this embodiment, the hole area ratio is set to 20% or more. However, if the hole area ratio is set to 20% or less, the amount of air passing through the through hole is small when the drum head 30 is hit with a stick. Thus, the vibration transmitted from the drum head 30 to the air does not decrease, and the hitting sound cannot be reduced. Therefore, the aperture ratio is set to 20% or more. In this embodiment, the hole area ratio is less than 50%. However, if the area ratio is 50% or more, the amount of film constituting the drum head 30 is reduced, and the tensile strength of the drum head 30 is insufficient. Is less than 50%.

  An impact sensor 41 is fixed to the back surface of the drum head 30. The impact sensor 41 is a sensor that detects an impact when the drum head 30 is hit with a stick, and outputs an electrical signal corresponding to the detected impact. The electrical signal output from the impact sensor 41 is input to a sound source unit (not shown) outside the trunk unit 10 via a signal line (not shown). When the electrical signal output from the impact sensor 41 is input to the sound source unit, the sound source unit outputs a striking sound based on the input electrical signal.

  Under this configuration, when the player strikes the drum head 30 with a stick, the air compressed inside the percussion instrument 1 by the percussion escapes from the plurality of through holes provided in the drum head 30 to the outside of the percussion instrument 1. . When the air compressed inside the percussion instrument 1 escapes to the outside of the percussion instrument 1, the air compression ratio near the upper and lower surfaces of the drum head is remarkably lowered and the propagation of vibration of the drum head 30 to the air is reduced. The hitting sound is reduced compared to the absence.

  In addition, if a drum head having an aperture ratio of 20% or more is to be configured, the drum head is increased in thickness in order to obtain sufficient tensile strength. However, if the drum head is increased in thickness, the rigidity of the drum head is increased. It becomes high and the problem that a hit feeling worsens arises. However, in this embodiment, the drum head is configured by laminating a plurality of films, and the films are not bonded to each other. For this reason, displacement occurs between the films at the time of impact, and the amount of deformation increases compared to the case where the thickness is a single layer. Therefore, even if the drum head is thickened to obtain tensile strength, the impact feeling is poor. Never become.

[Second Embodiment]
Next, a percussion instrument according to a second embodiment of the present invention will be described with reference to the drawings. In addition, in 2nd Embodiment demonstrated below, the same code | symbol as 1st Embodiment is attached | subjected about the part which has the same structure as 1st Embodiment, and the description is abbreviate | omitted.

  As shown in FIG. 3, the percussion instrument 1 </ b> A according to the second embodiment of the present invention is different from the first embodiment in the configuration for detecting the impact of hitting with a stick. As shown in FIG. 3, the percussion instrument 1 </ b> A includes a cushion material 40, an impact sensor 41, a pedestal member 42, impact buffer devices 43-1 to 43-3, and adjustment screws 44-1 to 44-3. I have. The pedestal member 42 includes an impact sensor 41 in the recess 42a, is supported by the impact buffering devices 43-1 to 43-3, and is pressed toward the drum head 30 by the impact buffering devices 43-1 to 43-3. Has been.

  The substantially spherical cushioning material 40 that transmits the impact generated in the drum head 30 to the impact sensor 41 is made of foamed polyurethane, for example, and is sandwiched between the drum head 30 and the impact sensor 41. Since the cushion material 40 has a substantially spherical shape, the contact area between the cushion material 40 and the drum head 30 is small when the impact of the impact with the stick is small, and the impact applied to the impact sensor 41 is also small. On the other hand, when the impact of the impact by the stick is large, the contact area between the cushion material 40 and the drum head 30 is increased, so the impact applied to the impact sensor 41 is also large, and the impact detection with high accuracy according to the impact impact is large. Is possible. In addition, even when the impact of hitting with the stick is large, the contact area between the cushion material 40 and the drum head 30 is increased, so that the vibration of the drum head 30 is absorbed by the cushion material 40 and the silencing effect is enhanced.

The impact sensor 41 is a sensor that detects an impact transmitted through the cushion material 40, and outputs an electrical signal corresponding to the detected impact.
Each of the shock absorbing devices 43-1 to 43-3 includes a spring and a damper device (both not shown) along the axial direction. One end of each of the shock absorbing devices 43-1 to 43-3 is fixed to the pedestal member 42, and the other end is an adjustment screw (wing screw) 44-1 to 44- penetrating through the bottom surface of the body 10. 3 is attached. The electrical signal output from the impact sensor 41 is input to a sound source unit (not shown) outside the trunk unit 10 via a signal line (not shown). When the electrical signal output from the impact sensor 41 is input to the sound source unit, the sound source unit outputs a striking sound based on the input electrical signal.

The adjustment screws 44-1 to 44-3 are screws for adjusting the position of the base member 42. When the adjusting screws 44-1 to 44-3 are rotated, the distance from the bottom surface of the body portion 10 to the end portions of the shock absorbing devices 43-1 to 43-3 is changed, and the shock absorbing devices 43-1 to 43-3 are changed. Move.
When the shock absorbing devices 43-1 to 43-3 are moved, the position of the pedestal member 42 is moved along with the movement, and the force with which the shock sensor 41 provided on the pedestal member 42 presses the cushion material 40 changes. . That is, when the adjusting screws 44-1 to 44-3 are rotated, the force with which the impact sensor 41 presses the cushion material 40 is adjusted, and thereby the contact area between the cushion material 40 and the drum head 30 is adjusted. When the contact area changes, the impact transmitted to the impact sensor 41 changes even if the drum head 30 is hit with the same strength. That is, the sensitivity for detecting the impact is adjusted by rotating the adjusting screws 44-1 to 44-3.

  Under this configuration, when the performer strikes the drum head 30 with a stick, the base member 42 including the impact sensor 41 is supported by the impact cushioning devices 43-1 to 43-3 and is not in contact with the trunk portion 10. Therefore, only the impact transmitted from the drum head 30 via the cushion material 40 is transmitted to the impact sensor 41. In addition, vibrations caused by the player touching the torso 10 and vibrations caused by the stick touching a part other than the drum head 30 are absorbed by the shock absorbing devices 43-1 to 43-3. The signal output from the impact sensor 41 represents a hit with a stick and is less affected by external vibration.

[Modification]
As mentioned above, although embodiment of this invention was described, this invention is not limited to embodiment mentioned above, It can implement with another various form. For example, the present invention may be implemented by modifying the above-described embodiment as follows.

  In the above-described embodiment, the material of the drum head 30 is polyethylene terephthalate. However, the material of the drum head is not limited to polyethylene terephthalate. For example, other materials such as polyimide and polyethylene naphthalate may be used. Good. In the drum head 30, three or more films may be laminated, or two layers instead of three layers. Moreover, you may make it change the thickness of the film to laminate | stack according to the material of a film. Further, the thickness of the film constituting the drum head 30 may be made different for each layer to be laminated. In the above-described embodiment, the diameter of the through hole provided in the drum head 30 is 0.5 mm to 3 mm. However, when the material of the film constituting the drum head is strong, the diameter may be 3 mm or more. Further, the layers of the drum head may be bonded using an adhesive having a weak adhesive force.

  In each of the embodiments described above, as shown in FIG. 4, a doughnut-shaped film 45 may be bonded to the back surface of the drum head 30 and a through hole penetrating the film and the drum head 30 may be opened. Note that the donut-shaped film attached to the drum head 30 may have a configuration in which a plurality of films are laminated instead of a single layer. In the above-described embodiment, the density of the through holes in the center portion of the drum head (the number of through holes per unit area) is rough, and the density of the through holes in the vicinity of the outer peripheral portion of the drum head is made dense. May be. According to these configurations, a high-order vibration mode having many vibration antinodes around the drum head is reduced, and vibrations around the drum head are suppressed, and high-frequency silence is increased. Further, the diameter of the through hole in the center part of the drum head may be different from the diameter of the through hole in the peripheral part of the drum head.

  In the second embodiment described above, the shape of the cushion material 40 is substantially spherical, but the shape of the cushion material 40 is not limited to a spherical shape. For example, you may make it use what fixed the bottom surfaces of two cone-shaped cushion materials (or cushion materials in the shape of polygonal pyramids, such as a triangular pyramid and a square pyramid). In the case of this shape, one end of the fixed cone (or polygonal pyramid) is in contact with the drum head 30, and the other cone (or polygonal pyramid) is in contact with the shock sensor 41 so that the apex of the other cone (or polygonal pyramid) is in contact with the impact sensor 41. The cushion material is held between the shock sensor 41 and the shock sensor 41. In the embodiment described above, the cushion material 40 is held between the drum head 30 and the impact sensor 41. However, the cushion material 40 is stuck to the drum head 30, and the impact sensor 41 presses the cushion material 40. In this manner, the cushion material 40 may be sandwiched.

  In the above-described embodiment, the shock absorbing devices 43-1 to 43-3 are provided with a spring and a damper device inside, but are configured so as not to transmit vibration and shock from the body portion 10 to the shock sensor 41. Is not limited to this configuration. For example, vibrations and shocks from the body 10 may be absorbed only by a spring, or vibrations and shocks may be absorbed by an elastic body other than the spring. The number of shock absorbing devices is not limited to three, and may be four as long as it is a position and number that can stably support the base member 42.

  In the above-described embodiment, the vibration of the drum head 30 may be detected by a vibration sensor, and a striking sound may be output from the sound source unit based on the detected vibration.

1 is an external view of a percussion instrument according to an embodiment of the present invention. 1 is a cross-sectional view of a percussion instrument according to a first embodiment of the present invention. It is sectional drawing of the percussion instrument which concerns on 2nd Embodiment of this invention. It is a figure explaining the drum head which concerns on the modification of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Percussion instrument, 10 ... Torso part, 20 ... Lug case, 22 ... Lug nut, 22a ... 鍔, 23 ... Spring, 24 ... Lug bolt, 30 ... Drum head, DESCRIPTION OF SYMBOLS 31 ... Head frame, 32 ... Clamping frame, 40 ... Cushion material, 41 ... Impact sensor, 42 ... Base member, 43-1 to 43-3 ... Impact buffering device, 44 -1 to 44-3 ... adjusting screw, 45 ... film.

Claims (1)

A drum head stretched around the open end of a drum body that is hollow and has an open end,
A plurality of films having elasticity are laminated, and a plurality of through-holes penetrating all the layers of the laminated film are provided , and the density of the through-holes in the central part of the open end and the peripheral part of the open end is Unlike the density of the through hole, the open end center the open end peripheral portion closely der Ru drumhead better of more of.

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