JPH0830264A - Soundboard and piano - Google Patents

Abstract

PURPOSE:To provide the soundboard and piano which can adjust sound effects with simple constitution. CONSTITUTION:A through hole 22 is formed at a right upper position in the figure of the soundboard 4, i.e., between an upper low-tone side sound rod 17b and a sound rod 17c to make a communication between the space in the piano 2 and the external space on the back side of the piano 2. Consequently, the attenuation quantity of a sound is increased by 3 to 4% and improved, specially, on the high-tone side where a key number is 55 to 70. The piano 2 equipped with the soundboard 4 requires only easy operation such as the boring of the through hole 22 and adjustments in shape and diameter for acoustic adjustments at the time of manufacture, and is advantageous in manufacturing cost, so that there is no problem. Further, the through hole 22 is only bored in the soundboard 4, so the piano is actualized by altering the design of a conventional piano a little.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a soundboard which can be adjusted to enhance sound effects and a piano equipped with the soundboard.

[0002]

2. Description of the Related Art A grand type piano or an upright type piano is provided with a frame for supporting the tension of strings. This frame vibrates together with the strings and subtly affects the sound quality. Therefore, the shape and strength of the frame have been modified to improve the acoustic characteristics. In addition to this, there is a soundboard that affects the acoustic characteristics, and this also makes the strength distribution of the soundboard high, especially on the treble side, due to the strength and spacing of the soundbars fixed on the back side. Adjusting the acoustic effect.

[0003]

Further, in order to adjust the acoustic effect, some kind of ingenuity has been desired. However, it is not possible to add a complicated structure such as the above-mentioned frame, sound board, and sound stick. It is difficult in terms of space, and further, the deterioration of manufacturing cost becomes a problem. Therefore, it has been desired to add a configuration capable of adjusting the acoustic effect with a simple configuration.

The present invention focuses on the soundboard and has a simple structure.
(EN) A soundboard whose acoustic effect can be adjusted and a piano using the soundboard.

[0005]

According to the first aspect of the present invention,
The soundboard is characterized by having a through hole that connects the inside of the piano and the outside of the back of the piano.

The invention according to claim 2 is the soundboard according to claim 1, wherein the piano is an upright type piano, and the through hole is provided in an upper portion on the bass side. The invention according to claim 3 is
The soundboard according to claim 1, wherein the through hole is circular or elliptical.

The invention according to claim 4 is a piano provided with the soundboard according to any one of claims 1 to 3.

[0008]

The soundboard according to the present invention is characterized in that the soundboard is provided with a through hole that connects the inside of the piano and the outside of the rear side of the piano. Since the soundboard has the through hole, the inside of the piano and the outside of the piano rear side can be connected to each other when the soundboard is incorporated in the piano. This makes it easier for acoustic vibrations inside the piano to escape to the outside. With this,
The acoustic characteristics of the entire piano change. Therefore, the acoustic characteristics can be adjusted by adjusting the shape, size, position, number, etc. of the through holes, and the acoustic characteristics can be improved. There is no problem in terms of space in the through hole, and since the through hole can be easily formed, there is no problem in terms of manufacturing cost.

This effect is obtained especially when the through-hole is provided in the upper part of the low tone side in the upright type piano and in the position near the keyboard of the low tone side in the grand type piano, especially in the high tone side. It produces an excellent effect that the sound is less likely to be attenuated. The shape of the through hole may be any shape. For example, it may be circular, oval, triangular,
It may be a polygon such as a quadrangle, a pentagon or a hexagon. When the size is, for example, one or two through holes, for example, a through hole having a diameter of about 65 mm ± 5 mm is formed. A large number may be provided with a small number, or one or two large numbers may be provided, but it is preferable to provide a smaller number than a large number because the ability to adjust the acoustic characteristics is greater.

When two through holes are provided, for example, in an upright type piano, two holes may be provided in the upper part on the bass side, but they may be provided separately in the upper part on the bass side and the lower part on the treble side. In the piano equipped with the soundboard, acoustic adjustment is easy in manufacturing, and there is no problem in manufacturing cost. Since only a through hole is opened in the soundboard, it can be realized without changing the design of the conventional piano. It can also be used for grand type and upright type pianos.

[0011]

Embodiments Next, embodiments will be described with reference to the drawings. [Embodiment 1] FIG. 1 is a rear view of an upright piano 2 of the first embodiment. FIG. 2 is an AA enlarged sectional view thereof.

On the rectangular soundboard 4 of the piano 2, diagonally 7
The sound sticks 17a to 17g of the book are fixed with an adhesive. In the sound sticks 17a to 17g, the interval on the low tone side (the interval between the sound stick 17a and the sound stick 17b) is the interval on the high sound side (the sound stick 17f and the sound stick 1b).
The distance between the sound rods 17b to 17f is gradually increased from the treble side to the bass side. In particular, the sound rods 17b, 17
c and 17d are on the low-pitched side in the upper part and on the high-pitched side in the lower part, and are arranged over a wide range from the low-pitched sound side to the high-pitched sound side. This point is the most characteristic of the sound stick 17c.

Further, the height of each sound bar 17a to 17g, that is, the height of protrusion from the surface of the sound board 4 is gradually increased on the low-pitched sound side, and is set to a constant height on the low-pitched sound side. On the back surface of the soundboard 4, a long piece 19 and a short piece 21 for transmitting vibration from a string (not shown) to the soundboard 4 are fixed with an adhesive.

The sound bar 17b, which is located at the upper right position of FIG. 1 of the sound board 4, that is, at the upper part of the bass side, has the above-mentioned characteristic sound bar 17b.
And a sound bar 17c, a through hole 22 is provided to connect the space SI inside the piano 2 and the external space SO on the back side of the piano 2. The diameter of the through hole 22 is 65 mm in this embodiment.

In addition, around the soundboard 4, columns 23a,
23b, claws 24a provided on the columns 23a and 23b,
24b, girder sticking 25, base 27, roof 29 and parent board 31
a and 31b are arranged. Inside the girder sticker 25, two girders 32a and 32b are horizontally arranged.

Supports 23a, 23b, base 27 and girder 3
2a and 32b are assembled as shown in FIG. 1 and are bonded together at their contact surfaces to be integrated. Of course, on the front side, although not shown, pedals such as a keyboard and an action mechanism necessary for the function of the piano are provided.

Since the piano 2 uses the soundboard 4 having the above-described through hole 22, the acoustic characteristics of the piano 2 are 0. The amount of attenuation in the range of 4 seconds (the range which is the most sensually recognizable) is improved by 3 to 4%. On the bass side, on the other hand, there are some keys that are slightly lowered, but for the piano 2, the bass side has almost no problem in terms of acoustic effect, and the treble side is greatly improved in acoustic effect. So overall, it is acoustically improved.

In addition to the through hole 22, if a through hole 22a is further provided at the lower left position of the sound board 4 in FIG. 1, that is, between the lower sound stick 17d and the sound stick 17e on the treble side, The acoustic effect is almost the same as the case where there is one through hole 22. The piano 2 provided with the soundboard 4 is an easy work for acoustic adjustment at the time of manufacturing, such as opening the through holes 22 and 22a and adjusting the shape and diameter, and there is no problem in manufacturing cost. Also,
Since only the through hole 22 is opened in the soundboard 4, it can be realized with almost no design change of the conventional piano.

[Embodiment 2] Next, a grand type piano 50.
Examples of are shown in FIGS. FIG. 3 shows a grand type piano 50.
4 is a plan view of only the soundboard 52 portion of FIG. 4, and FIG. 4 is a partial cross-sectional view of the grand type piano 50.

Ten sound sticks 54a to 54j are obliquely fixed to the lower surface of the sound board 52 with an adhesive. A long piece 56 and a short piece 58 that transmit vibration from a string (not shown) to the soundboard 52 are fixed to the upper surface of the soundboard 52 with an adhesive. FIG.
Of the sound board 52 on the left front side, that is, near the keyboard on the low tone side, a through hole 60 is provided between the sound stick 54f and the sound stick 54g, and a space SU above the piano 50 and a space SD below the piano 50 are provided. Have been in contact with. The diameter of the through hole 60 is 65 mm in this embodiment.

Since the piano 50 uses the soundboard 52 provided with the above-mentioned through hole 60, the same acoustic characteristic as that of the first embodiment is obtained. [Others] In each of the above embodiments, the through holes 22, 22
The shapes of a and 60 were circular or elliptical, but may be any shape other than this. For example, it may be a polygon such as a triangle, a quadrangle, a pentagon, or a hexagon, or an irregular shape. Moreover, the size is, for example, 65 m in diameter.
Although the through hole has a diameter of m, many holes having a smaller diameter may be provided. However, it is preferable to provide a large number of small ones rather than a large number of small ones because the ability to adjust the acoustic characteristics is large.

Even when two through holes are provided, in the first embodiment, one is provided in each of the upper part on the bass side and the lower part on the treble side, but two holes may be provided in the upper part on the bass side.

[Brief description of drawings]

FIG. 1 is a rear view of an upright piano according to an embodiment.

FIG. 2 is an AA enlarged cross-sectional view thereof.

FIG. 3 is a plan view of only a soundboard portion of a grand type piano of one embodiment.

FIG. 4 is a partial sectional view of the grand type piano.

[Explanation of symbols]

2 ... Upright type piano 4, 52 ... Soundboard 22, 22a, 60 ... Through hole 50 ... Grand type piano

Claims (4)

[Claims] 1. A soundboard comprising a through hole for connecting the inside of the piano and the outside of the back of the piano. 2. The soundboard according to claim 1, wherein the piano is an upright type piano, and the through hole is provided in an upper portion on a bass side. 3. The through hole is circular or elliptical.
Or the soundboard according to 2. 4. A piano equipped with the soundboard according to claim 1.