JPS5910994A - Sound plate for musical instrument - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tone plate for a musical instrument used in percussion instruments such as a xylophone, marimba, and vibraphone.

Traditionally, the tone plates of the above percussion instruments include Honduras rose,
Wood such as Ono-ore and Buttock, and fiber-reinforced plastics such as glass fiber-reinforced plastic and carbon fiber-reinforced plastic are used. However, although tone plates made of wood can produce a mellow and deep tone, they have the disadvantage that it is difficult to obtain a homogeneous product because they are natural products, and the tone and scale change depending on weather conditions. . On the other hand, tone plates made of fiber-reinforced plastic do not change the tone or scale depending on the weather conditions, produce a uniform product, and have the advantage that the internal loss of vibration energy is small and the sound extends well. However, the drawback is that the sound quality is very cold and hard. This is because when the sound plate of this harpoon is struck, the sound pressure level of higher harmonics is very banded.

Therefore, in order to make full use of the quality of the tone plates made of fiber-reinforced plastic and to make the sound feel soft and warm, we have made extensive efforts to develop the 8-Gin of the present invention. It was found that there is a proportional relationship between the elastic modulus (ET) of ET and the sound pressure level of diurnal overtones. That is, as the ET of the material forming the tone plates increases, the sound pressure level of the measured overtones increases, and the resulting sound becomes cold and hard.

Figures 1 to 4 show the input to the tone plate +-f (that is, the reaction from the tone plate) when a tone plate made of aluminum, carbon fiber reinforced plastic, Honduras rose, or Sitka spruce is struck. ), but for aluminum with an ET of 7200'@, the spectrum extends in the ~13KHz trench, but the E
T grows only to 80 (~3Kl]z in Sitka spruce. Honduras rose (Ei T, =
240\I) (r) Carbon fiber reinforced plastic with twice the ET (ET = 4so) ~l OK11
It can be seen that it has grown to Z Chengxing. As a result of various experiments, it has been found that in order to obtain the desired hearing sensation and impact feel, it is best to use a tone plate with an ET that extends the sound pressure level up to ~6 KHz, which corresponds to the Honduran Rose.

And the ET that satisfies this condition is 1oo-350Xz
I learned that it is within the range of It has also been found that this effect can be similarly obtained by using a material having an ET within the above range for the striking MIX surface of the tone plate, even if the tone plate is made of solid wood. In this case, it was also learned that the thickness of the surface portion should desirably be 1.0 mm or more from the perspective of O,L.

This invention was made based on the above knowledge, and has a good sound extension, a woody tone that is neither too hard nor too soft, and has uniform characteristics without changing the tone or scale depending on weather conditions. The object of the present invention is to provide a tone plate for a musical instrument having the following characteristics.

Hereinafter, the present invention will be described in detail with reference to the drawings.

FIGS. 5 to 7 show a first example of a tone plate for a musical instrument according to the present invention. This tone plate 1 has a multilayer structure consisting of a surface layer 2 and a base layer 3, which serve as the striking surface. As shown in an enlarged view in FIG. 7, the surface fm 2 consists of a wood veneer 4 and a fiber-reinforced plastic plate 5.
This is a book in which the sound plates 1 and 2 are alternately integrated in the width direction, and are arranged so that the laminated surface coincides with the longitudinal direction of the tone plate 1. Furthermore, the elastic modulus (
ET) is 100-350~, and Katsuzo's J learning is O
, l [71 or more, preferably 1.0 or more.

The above group) So3 is made of fiber-reinforced glass reinforced with glass fiber or carbon fiber, and the matrix resin used is epoxy 4M resin, unsaturated polyester resin, phenol resin, etc., and the shape of the fiber is uniform. It is preferable that the fiber axes are aligned in the same direction, but it is not limited to the lining. In addition, reinforcing fiber content 1iIG1.30
% or more, preferably 50% or more, ]DT is 300 to
For example, a carbon fiber-reinforced epoxy resin consisting of 5% carbon fiber and 45% epoxy resin is preferably used for base 1-3.

To explain the M member forming the surface 1M2 in a collaborative manner, for example, wood veneer 4 is made of Sitka spruce & (
A thin plate 5 made of fiber-reinforced glasstic and a carbon fiber-reinforced gelastic board (ET=80~) made of 60% epoxy resin and 60% carbon fiber and 40% epoxy resin were added. 480~), and a number of these single plates 4 and thin plates 5 are alternately laminated and integrated using an epoxy resin adhesive to be used as a member for forming the surface layer 2. In the above combination, the ET of the laminated member is 190.

In the tone plate 1 configured in this way, the Et of the surface layer 2 is 10
0 to 350 (rolling), the thickness is 01 or more, and the base layer 3 is made of fiber reinforced plastic, so as mentioned above, the sound pressure level of the measurement multiplication during impact is ~
It expands at 6KHzt, producing a warm tone with a woody texture, and a sound with good extension.

FIGS. 8 and 9 show a second example of the tone plate of the present invention. In this example, the tone plate 1 has a top UIn layer 2 made of onorekaba (T=260%j) and rosewood (ET
-240h ,
The above is the same as the tone plate of the first example except that it is preferably made of wood with a diameter of Get l mm or more. With the tone plate 1 of this example as well, it is possible to obtain a tone that has a woody feel and has good extension, similar to the tone plate of the first example.

In this way, the elasticity modulus ICT in the thickness direction of the surface layer 2 of the tone plate 1 is set to 100 to 350, and the thickness of the surface layer 2 is set to 0.
By setting it to 1 mm or more, preferably 1 mm or more,
It is possible to control the input debris vector (wave number range) when the tone plate 1 is hit. In other words, ET is 1OOk
If it is less than
"The spectrum where T exceeds 350~l OK Hz
This causes the sound to be too hard and too sharp.

Therefore, according to the tone plate of the present invention, it is possible to obtain a sound that is neither too hard nor too soft, has just the right amount of woody feel, and has good extension.

In addition, soft woods such as maple and spruce, which have traditionally been considered unsuitable for tone plates, can be used as the material for forming the surface layer, and narrow boards and thin boards can also be used. It is also possible to use wood that has previously been exposed, providing manufacturing advantages. Furthermore, since it has a product #II structure, an artistic effect can be obtained by changing the coloring of the surface layer and the group l-.

[Brief explanation of drawings]

Figures 1 to 4 are graphs showing the Fourier spectrum of the impact input signal when each material forming the tone plate is hit. Figure 1 is for aluminum, Figure 2 is for carbon fiber reinforced plastic, Figure 3 shows the spectrum of Honduras rose, and Figure 4 shows the spectrum of Sitka spruce. Figures 5 to 7 show a first example of the tone plate of the present invention.
Fig. 5 is a perspective view, Fig. 6 is a sectional view, Fig. 7 is an enlarged sectional view of main parts, and Figs. 8 and 9 are examples of the storage 2.
The figure is a perspective view, and FIG. 9 is a sectional view. 1...Tone plate, 2...Surface collapse, 3...
Base j-14...Wood veneer, 5...Thin plate made of fiber-reinforced plastic. Applicant Nippon Musical Instruments Manufacturing Co., Ltd. Agent Patent Attorney Masa Shiga Takepa. □ □ , Ino w, 2 Figure one round 1iL (KHz) One round slope mosquito (NiH2) Figure 5 9 Figure 6 Figure 7 Figure 8 Figure IJ9

Claims (2)

[Claims] (1) A surface layer made of a material having a modulus of elasticity in the thickness direction of 100 to 300 and having a thickness of 0.1 or more is provided on the surface of the base layer, which is similar to fiber-reinforced glass. A tone plate for musical instruments featuring the following. (2) The tone plate for a musical instrument according to claim 1, wherein the surface layer is formed by laminating and integrating a wood veneer and a thin plate of lKk reinforced plastic in the width direction.