JP2008224880A - Drum head and electronic drum equipped with the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a drum head and an electronic drum equipped with the same, capable of obtaining excellent percussion feeling with rebound feeling. <P>SOLUTION: The electronic drum comprises: the drum head 10 in which a coating layer 111a (111b) is formed on at least one face of polyester film object 110; an extension mechanism 30 for extending the drum head 10 to a shell section 20 so as to cover the drum head 10, a shell section 20 with high stiffness property and an aperture face of the shell section; and a percussion sensor 42 for detecting vibration of the drum head 10. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a drum head and an electronic drum including the drum head.

  The electronic drum detects the vibration of the striking surface with a sensor when the drum head constituting the striking surface is struck with a beater such as a stick or a kick pedal, and generates a musical sound corresponding to the striking based on the detection signal It is configured.

  In the conventional typical type electronic drum, for example, as disclosed in Patent Document 1, a drum head is formed by covering the surface of an iron plate with a rubber layer. Then, by setting the rubber layer to be thick, the hit feeling is made as close as possible to the acoustic drum. However, due to the rigidity of the iron plate, there is no rebound feeling when hitting the drum head of the acoustic drum by the film body, and the hit feeling obtained by adjusting the thickness of the rubber layer is limited.

As another type of conventional electronic drum, a drum head equipped with a leather or plastic sheet is attached to the opening edge of the shell portion, and the vibration of the head is transmitted to the sensor via a buffer member. It has been proposed (for example, Patent Document 2).
However, the leather or plastic headsheet stretched on the shell portion has a large hitting sound generated by the head itself, and the quietness characteristic of the electronic drum is impaired. In order to deal with this, there is a sound absorbing material such as a sponge inside, but this requires a material and a mounting structure, and the cost is increased. Furthermore, the sound of the head itself interferes with the electronic sound emitted from the speaker, and tends to give the player and audience a sense of discomfort.
JP 2006-72063 A JP 2003-173186 A

  The present invention eliminates these problems of the prior art, provides a good impact feeling with a good rebound, and produces a low impact sound of the head itself so that it does not impair the design image when used in an electronic drum. An object is to provide a head and an electronic drum including the drum head.

In order to achieve the above object, the present invention provides a drum head characterized in that a rubber coating layer is formed on at least one surface of a polyester film-like body. (First invention)
In order to achieve the above object, the present invention also provides the drum head, a highly rigid shell portion, and a tensioning device for stretching the drum head so as to cover the opening surface of the shell portion. An electronic drum comprising a mechanism and an impact sensor for detecting vibration of the drum head is provided. (Second invention)

  In the drum head according to the first aspect of the present invention, the rubber coating layer is formed on at least one surface of the polyester film-like body. Therefore, the drum head is attached so as to cover the opening surface of the shell portion of the electronic drum. The state-like body gives an excellent rebound feeling against hitting with a stick or the like, and a good hitting feeling can be obtained. Further, the polyester film-like body exhibits excellent durability against impact. Since a rubber coating layer is formed on at least one surface of the film-like body, much of the impact energy is absorbed by the rubber layer. As a result, the sound volume produced by the head itself is small and does not give a sense of incongruity due to interference with the electronic sound emitted from the speaker. Moreover, the rubber-coated head is close to the design image of a typical conventional electronic drum and does not spoil the image. Furthermore, by matching the structure of the surroundings such as the fresh hoop of the head, it can be stretched around the shell of the acoustic drum, and can be used as a silent drum or a drum close to this, making use of a small sound output.

  An electronic drum according to the second aspect of the invention includes the drum head, a highly rigid shell portion, and a tension mechanism for tightening the drum head to the shell portion so as to cover the opening surface of the shell portion. The drum head includes a striking sensor for detecting vibrations of the drum head, so that a good striking feeling rich in repulsion can be obtained by utilizing the characteristics of the drum head, and the head itself emits. The sound volume is small and does not give a sense of incongruity due to interference with an electronic sound, and does not impair the design image of a conventional typical type electronic drum.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. The same or similar parts in the drawings may be denoted by the same reference numerals and description thereof may be omitted.

  FIG. 1 is a longitudinal sectional view of an electronic drum provided with a drum head according to an embodiment of the present invention, and FIG. 2 is a plan view thereof. This electronic drum is a snare drum, and the head 10 is attached so as to cover the opening of the shell portion 20, and is tightly stretched by the tension mechanism 30. A sensor unit 40 for detecting vibration of the head at the time of impact is attached to the shell portion 20.

  The head 10 is obtained by fixing a fresh hoop 12 around the head sheet 11 as shown in a partially enlarged view in FIG. The fresh hoop 12 is made of metal or resin. In this embodiment, the edge of the head sheet 11 is wound around the fresh hoop 12 and bonded to fix both. In addition to this, as shown in FIG. 4 (a), the edge of the head sheet 11 is inserted and bonded to the groove of a fresh hoop 12a having a U-shaped cross section, or as shown in FIG. 4 (b). As described above, a fresh hoop 12b comprising a hoop main body 120 having a U-shaped cross section and a ring-shaped core metal 121 is used, and the head sheet 11 and the edge 121 of the core metal are inserted into the groove of the hoop main body 120, and the hoop main body 120 is By caulking (plastically deforming by pressing), the whole can be integrated. In addition, various fixing structures of other conventional head sheets and fresh hoops can be employed for the fixing.

  The shell portion 20 has a shallow bowl shape and is made of a highly rigid material such as metal, resin or wood so that the head sheet 11 can be held tightly. The head sheet 11 is formed at the edge 21 around the opening. To touch.

  The tension mechanism 30 includes a hoop 31 applied to the flange 21 projecting outward from the side wall of the shell portion 20, and a tension bolt 32 that fixes the hoop to the flange 21. The hoop 31 has an annular shape and has a substantially Z-shaped cross section. The upper portion 310 engages with the fresh hoop 12 of the head 10 at the upper portion 310, and the lower portion 311 contacts the flange 21. A plurality of through holes are formed in the lower part 311, and the tension bolt 32 is screwed into a female threaded hole provided in the flange 21 through the through hole. By tightening the tension bolt 32 tightly, the fresh hoop 12 is pulled downward, and the head sheet 11 is stretched with a predetermined tension while being supported by the edge 21 of the shell portion 20. . By adjusting the degree of fastening of the tension bolt 32, the tension of the head 10 can be tensioned. In addition, the tensioning mechanism 30 can also be provided with an adjustment unit for adjusting the tension of the head sheet 11 separately.

  FIG. 5 shows an example of the adjustment unit. This tensioning mechanism 30 a has a structure in which a shell-like lug 301 is fixed to a side surface of the shell portion with a screw 201 extending from the inside of the shell portion 20, and a lug nut 302 is passed through a hole 301 a on the upper wall of the lug 301. The lower end of the lug nut 302 is received by the support piece 202 locked to the shell portion 20. Further, a pressing hoop 303 is put on the upper side of the fresh hoop 12 fitted in the shell portion 20, a tension bolt 304 is passed through the through hole 303 a of the hoop 303, and the tip thereof is screwed into the lug nut 302. To do. The lug nut 302 is expanded in diameter at the lower end so that the lug nut 302 cannot be pulled upward from the through hole 301a. Therefore, by rotating the tension bolt 304 and entering the lug nut 302, the hoop 303 can be drawn downward to increase the tension of the head sheet 11, and the tension of the head sheet 11 can be decreased by reverse rotation. Can do.

  The sensor unit 40 used in this embodiment includes a holder 41 fixed to the flange 21 of the shell portion 20, and a striking sensor 42 made of a piezoelectric element supported by the holder 41. The holder 41 is fixed to the flange 21 by mounting bolts 43, and the impact sensor 42 is supported by the holder 41 via an appropriate cushioning material 44.

  The head sheet 11 includes a polyester film-like body 110 and a rubber coating layer 111. In this embodiment, coating layers 111a and 111b are provided on both the striking side and the opposite side of the film-like body 110. Is formed.

  The polyester film-like body 110 has a circular shape or a shape close to this, and can be a film-like body having various forms such as a continuous film, a woven fabric, a knitted fabric, and a non-woven fabric. The film-like body 110 can be a non-porous continuous film. However, in order to increase the bonding strength with the rubber coating layer, a large number of pores are provided in the continuous film, or the surface of the continuous film is roughened. It is desirable to make it face, or to form the film-like body with a woven fabric, a knitted fabric or a non-woven fabric. The surface of the continuous film can be roughened by chemical etching with a caustic agent or the like, or grinding with a file such as cloth, paper or metal. When the film-like body 110 is a knitted fabric, it is desirable to use, for example, 50 to 75 dtex yarn. Moreover, when making the film-like body 110 into a perforated or non-porous continuous film, the thickness can be, for example, 0.5 to 0.8 mm.

  Further, when the coating layers 111a and 111b are formed on both surfaces of the film-like body 110 as in this embodiment, the coating layers 111a and 111b are passed through a large number of pores provided in the continuous film, or the stitches or weaves of the knitted fabric. It is desirable that 111b penetrates the film-like body 110 and is joined to each other at a number of locations. Thereby, strong integration with a film-like body and a coating layer is obtained.

  In the case where the membrane 110 is a woven fabric, in order to obtain the joining through the rubber, the knitted fabric membrane 110 is preferably a mesh (mesh). It is desirable to use a weaving method such as weaving or plain weaving. Also, a plurality of knitted fabrics can be laminated so that the direction of the weave or the stitch is oblique, thereby obtaining isotropic strength against impact.

When the film-like body 110 is a film body provided with a large number of pores, it is desirable that the diameter of the pores be 2 to 5 mm in order to obtain bonding by penetration of the rubber. If the diameter of the pore is smaller than this lower limit, the joint strength between the rubbers on both sides of the film-like body 110 cannot be sufficiently improved. The difference becomes large and unevenness is likely to occur on the surface. From this viewpoint, the pores are more preferably 3 to 4 mm.
Further, the arrangement density of the pores is desirably 1000 to 1500 / m ² . If the pore density is lower than this lower limit, there is a case where appropriate improvement in bonding strength cannot be obtained. Moreover, when the pore density is higher than the upper limit, the strength of the film-like body may be lowered.

As the rubber forming the coating layers 111a and 111b, materials such as ethylene propylene rubber, natural rubber, butadiene rubber, urethane rubber, fluoro rubber, EVA and other elastomers can be used.
Further, the thickness of the coating layer is desirably 0.5 to 2 mm. If the thickness of the coating layer is thinner than this lower limit, the coating tends to be non-uniform. If the coating layer is thicker than the upper limit, the repulsive force of the striking surface will be reduced, and the feeling of hitting especially at the time of weak hitting will be reduced. From this viewpoint, the coating layer is more preferably 0.5 to 1 mm.

  Further, it is desirable that the coating layer 111b on the side opposite to the striking side of the head sheet 11 is kept within a range from the edge of the head 10 to a certain extent inside as shown in FIG. Thereby, it can avoid that the coating layer 111b peels from the film-like body 110 by friction with the edge part 21 of the shell part 20. FIG. However, if the problem of peeling does not occur, the coating layer 111b may be provided up to the edge of the head sheet 11.

  In order to obtain the head sheet 11 by forming the coating layers 111a and 111b on the polyester film-like body 110, for example, a large-sized polyester sheet is coated with a rubber material mixed with a roll coater to have a predetermined thickness. By vulcanization, a large rubber-coated sheet can be produced and cut into a predetermined size and shape.

  As described above, since the head 10 includes the film-like body 110, the film-like body is elastically bent with respect to a hit with a stick or the like, and has an excellent repulsion feeling by being stretched on the shell portion 20. Gives a good feeling of hitting. In FIG. 3, the bending state at the time of impact is indicated by a broken line (the amount of bending is increased from the normal amount for the sake of clarity). Moreover, since polyester is used for the film-like body 110, durability against impact is high. In addition, since a rubber coating layer is formed on the surface of the film-like body 110, much of the striking energy is absorbed by the rubber layer, and the volume emitted by the head itself can be kept small. In addition, since the head is rubber-coated, a design image close to the conventional typical type of electronic drum can be obtained. In addition, since the tension on the shell portion 20 can be adjusted by the tension mechanism 30, the head 10 can be adjusted to a desired tension by the user himself, and the head 10 can be replaced by the user himself. Can do.

  Further, since the rebound feeling at the time of hitting is obtained by the film-like body, a good hitting feeling can be obtained even if the rubber coating layer is thin as described above. On the other hand, a conventional type drum head whose iron plate surface is covered with a rubber layer requires a thick rubber layer of 5 to 6 mm in order to obtain a desired feeling of hitting, and as a result, the molding time for rubber coating becomes longer. There were drawbacks. On the other hand, the drum head according to the present invention has a thin rubber coating layer, so that the coating process can be completed in a very short time, and high productivity can be obtained. In addition, since the amount of rubber used is small, the manufacturing cost is also reduced.

  The present invention is not limited to the above embodiment, and various modifications can be made. The coating layer can be provided on both sides of the film-like body 110 as in the above embodiment, or can be provided only on either the striking side or the opposite side. In order to reduce sound generation at the time of impact, it is desirable to provide a coating layer at least on the impact side of the film-like body. The striking sensor can be provided on the opposite side of the striking side, and in addition to the piezoelectric element, a pressure (pressure-sensitive) sensor, a sensor using a photoelectric conversion element, a magnetic sensor, or the like can be used, and its form is also in a block shape, It can be a film or the like. In addition to the saddle shape, the shell portion can have various forms that can support the head in a state where a gap is formed between the shell portion and the head sheet so as to allow bending at the time of impact.

  The above embodiment is an example of a snare drum, but the present invention can also be applied to various electronic drums such as a tom tom type, a bass drum type, and a floor tom type. In particular, a drum hitting with a kick pedal beater, such as a bass drum type electronic drum, easily wears the felt of the beater when the hitting surface is made of polyester fiber, but the invention is provided with a rubber coating layer on the hitting surface. There is no such problem.

It is a longitudinal cross-sectional view of the electronic drum provided with the drum head which concerns on one Embodiment of this invention. It is a top view of the electronic drum shown in FIG. It is sectional drawing which expands and shows the edge part of the drum head used for the electronic drum shown in FIG. It is sectional drawing which shows the example of the drum head edge part different from FIG. It is sectional drawing which shows the example of the tension mechanism of the head seat different from what was shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Drum head 11 Head sheet 12 Fresh hoop 20 Shell part 30, 30a Adjustment mechanism 31, 303 Hoop 32, 304 Tension bolt 40 Sensor unit 42 Impact sensor 110 Polyester film-like body 111a, 111b Coating layer

Claims (5)

A drum head characterized in that a rubber coating layer is formed on at least one surface of a polyester film-like body. The drum head according to claim 1, wherein the film-like body is a knitted fabric of polyester fibers. The drum head according to claim 1, wherein the film-like body is a polyester continuous film provided with a large number of pores. 4. The rubber coating layer is formed on both surfaces of the film-like body, and the coating layer penetrates the film-like body and is bonded to each other at a number of locations. Drum head as described. A drum head according to any one of claims 1 to 4, a highly rigid shell portion, and a tensioning mechanism for tensioning the drum head on the shell portion so as to cover an opening surface of the shell portion. An electronic drum comprising an impact sensor for detecting vibration of the drum head.

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