JPH10240236A - Soundboard structure for upright piano - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a soundboard structure for an upright piano which is improved in timbre and sound volume. SOLUTION: The soundboard structure of the upright piano 10 is equipped with a 1st soundboard 11 which is provided on the piano front side of a column framework 41, a 2nd soundboard 21 which is provided on the piano back side of the column framework 41, and a vibration transmission member 31 which connects both the soundboards 11 and 21 together. This piano 10 has soundboard area equal to the sum of the area of the 1st soundboard 11 and the area of the 2nd soundboard 21, so a timbre and sound volume which are as rich as or richer than those of an ordinary piano can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a soundboard structure for an upright piano.

[0002]

2. Description of the Related Art Conventionally, in an upright piano 100,
Strike 11 on the front side of the pillar 111, that is, on the piano player side.
A sound board 107 is provided through the sound board 3, and a piece 106 for transmitting vibration of a string to the sound board 107 is provided on the sound board 107. A frame 115 is provided on the front side of the soundboard 107.
The string 105 is stretched between the tuning pin 117 and the hitch pin 119 provided on the frame 115.

The tuning pin 117 is provided on the tuning pin side 115a of the frame 115, and the hitch pin 119 is provided on the hitch pin side 115b of the frame 115.
It is provided in. In the upright piano 100, when the keyboard 101 is pressed, a rotational force is applied to the hammer 103 via the action mechanism 102, and the hammer 1
03 rotates and the hammer 103 is let off (that is, separates from the action mechanism 102).
Hit 05. Then, the string 105 vibrates, and the string vibration is transmitted to the soundboard 107 by the piece 106, and the soundboard 107 vibrates to generate a musical sound.

[0004]

In recent years, it has been desired to reduce the size and weight of upright pianos. Therefore, the size of pianos and the weight of heavy parts have been reduced.

However, in the structure of the conventional upright piano 100, when the size of the piano is reduced, the area of the sound board 107 is reduced, so that the sound board 107 sufficiently fulfills functions such as converting string vibration into air vibration. It became difficult, and there was a slight dissatisfaction in terms of tone and volume.

In order to reduce the weight of the frame 115, which is a heavy component, for example, the tuning pin side 115a
When the frame area is reduced by omitting the above, there is also a problem that the tension of the strings becomes small, and there is a difference in tone and volume from a normal piano.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a soundboard structure of an upright piano having improved timbre and volume.

[0008]

In order to solve the above-mentioned problems, a soundboard structure of an upright piano according to the present invention comprises a first soundboard attached to a front side of a support, and a back face of the support. And a second soundboard attached to the second soundboard, wherein string vibration of a piano is transmitted to the first soundboard and the second soundboard is transmitted to the second soundboard.
It is also transmitted to the soundboard.

In such an upright piano, when a hammer strikes a string by pressing a key, string vibration is transmitted to the first soundboard and further transmitted to the second soundboard. According to the soundboard structure of such an upright piano, even if the piano size is small, the area of the soundboard becomes the size obtained by adding the area of the second soundboard to the area of the first soundboard. It can sufficiently fulfill the function of changing to air vibration, and has the effect that a rich tone and volume equal to or higher than that of a normal piano can be obtained. On the other hand, when this configuration is adopted for a normal piano, an effect is obtained that a richer tone and volume can be obtained as the sound board area increases.

In the present invention, even if the first sound board and the second sound board are not connected, the vibration of the first sound board is transmitted to the second sound board by, for example, air vibration. However, when the first sound board and the second sound board are connected by the vibration transmitting member,
This is preferable in that the vibration of the soundboard is efficiently transmitted to the second soundboard via the vibration transmission member. As a vibration transmission member,
Although not particularly limited, for example, a wood piece, a metal piece and the like can be mentioned.

It is preferable that the vibration transmitting member connects the first sound board and the second sound board at a position of a piece (long piece or short piece) joined to the first sound board. In this case, since the piece transmits the vibration of the strings to the first soundboard and also transmits the vibration to the second soundboard via the vibration transmitting member, the vibration characteristics of the first soundboard and the second soundboard become substantially the same, and This is preferable in that a richer tone and volume can be obtained. The vibration transmitting member may be provided in the form of a spot, or may be provided in substantially the same shape as the piece.

Further, in the present invention, the piano frame may have a shape in which only the hitch pin side is omitted and the tuning pin side is omitted. Generally, one of the functions of a piano frame is to support string tension. In this regard, the piano frame with the tuning pin side omitted is
Compared with a normal piano frame having a hitch pin side and a tuning side, the force for supporting the string tension is weakened, and the tone and volume tend to be inferior. However, even when a piano frame in which the tuning pin side is omitted is used, if the configuration of the present invention, that is, the structure including the second soundboard in addition to the first soundboard, is adopted, the tone and volume are the same as those of a normal piano. This has the effect of being further improved.

The hitch pin is a pin for fixing the string, and the tuning pin is a pin for adjusting the tension of the string. That is, the string is stretched between the hitch pin and the tuning pin, and the tension is changed by operating the tuning pin.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view of an upright piano (hereinafter simply referred to as “piano”) according to the present embodiment.
FIG. 1 is a diagram viewed from A in FIG. 1, and FIG. 3 is a schematic explanatory diagram of the first and second sound boards.

The piano 10 of this embodiment is manufactured smaller than the size of a conventional piano (height: about 120 cm × width: about 150 cm × depth: about 60 cm). The soundboard structure of the piano 10 is the same as the first soundboard 11 provided on the front side (right side in FIG. 1, the same applies hereinafter) of the column assembly 41.
A second soundboard 21 provided on the back side of the piano of the strut assembly 41 (the left side in FIG. 1, the same applies hereinafter);
And a vibration transmitting member 31 for connecting the two. The column assembly 41 is composed of a plurality of columns 42 erected in the vertical direction, a girder 43, a box 44, and a base 45 spanned in the horizontal direction, and supports the string tension and holds the piano case. It fulfills.

The first soundboard 11 is composed of spruce, German cypress,
It is made by using wood such as pine to cut a straight-grained board diagonally across the side and into a generally rectangular shape. The first soundboard 11 has a shape that is raised toward the front of the piano, that is, has a thickness. The four sides of the outer circumference of the first soundboard 11 are connected to the box 44 of
It is attached to the base 45 and the columns 42 on both left and right sides.

A piece 6 (a long piece 6a and a short piece 6b, see FIG. 2) is adhered to the front side of the piano of the first sound board 11. The bridge 6 controls the vibration of the string 5 supported by the bridge pin 18 as the first vibration.
It plays a role of transmitting to the soundboard 11. The string 5 is stretched between a tuning pin 17 screwed into a pin plate 16 and a hitch pin 19 fixed to a metal plate 15 of a conventional piano frame having a tuning pin side omitted and only the hitch pin side left. ing. The stretched string 5 has a string holder 46, a pin plate 1
The fore-side bearing 47 and the bridge 6 provided directly on the metal plate 6 and the back-side bearing 48 provided on the metal plate 15 provide a torsion force and are set at a position facing the hammer 3 of the action mechanism 2.

On the back surface of the first sound board 11, a plurality of first sound bars 13 for transmitting string vibrations quickly to the entire first sound board 11 are arranged in an oblique direction. On the other hand, the second soundboard 21
Is made in the same manner as the first soundboard 11, and its four outer peripheries are connected to the spar 4
3. It is attached to the base 45 and the columns 42 on both left and right sides. On the back surface of the second sound board 21, a plurality of second sound bars 23 for transmitting string vibrations quickly to the entire second sound board 21 are arranged in an oblique direction.

The vibration transmitting member 31 includes the first soundboard 11 and the second soundboard 11.
The sound of the first sound board 11 is connected to the second sound board 2
It plays a role of communicating to the first party. This vibration transmission member 31 is formed of the same material as the first soundboard 11,
As shown in the figure, a plurality of spots are provided along the shape of the long piece 6a and the short piece 6b.

The vibration transmitting member 31 may be formed in a curved shape along the shape of the long piece 6a and the short piece 6b as shown in FIG. 4. In this case, the vibration of the first sound board 11 is reduced. Second
Transmission to the soundboard 21 is further facilitated. The operation of the piano 10 having the above configuration will be described with reference to FIG. When the keyboard 1 of the piano 10 is pressed, a rotational force is applied to the hammer 3 via the action mechanism 2. Then, after the hammer 3 rotates and let-off in the middle thereof, the string striking portion 3a strikes the string 5. Then, the string 5 vibrates, and this vibration is transmitted to the first soundboard 11 by the piece 6. At this time, the string vibration is quickly transmitted to the entire first sound board 11 by the first sound bar 13. As a result, a musical sound is generated from the first soundboard 11.

The string vibration transmitted to the piece 6 is also transmitted to the second sound board 21 via the vibration transmitting member 31. In addition, the vibration of the first sound board 11 is transmitted via air to the second sound board 21. Is transmitted to At this time, the string vibration is quickly transmitted to the entire second sound board 21 by the second sound bar 23. As a result, the second soundboard 2
1 produces a musical sound.

As described above, according to the piano 10 of the present embodiment, the area of the sound board is equal to the area of the first sound board 11 and the area of the second sound board 21 even though the size of the piano is smaller than that of the prior art. , The effect of obtaining a rich tone and volume equal to or higher than that of a normal piano is achieved.

Since the first sound board 11 and the second sound board 21 are connected by the vibration transmitting member 31, the first sound board 11
Is transmitted to the second soundboard 21 not only through the air but also through the vibration transmission member 31. Therefore, the vibration of the first soundboard 11 is transmitted to the second soundboard 21 more efficiently, and an effect that a richer tone and volume can be obtained is obtained.

Further, since the vibration transmitting member 31 connects the first sound board 11 and the second sound board 21 at the position of the piece 6 joined to the first sound board 11, the piece 6 controls the vibration of the string 5. The sound is transmitted to the first soundboard 11 and also transmitted to the second soundboard 21 via the vibration transmission member 31. For this reason, the vibration characteristics of the first sound board 11 and the second sound board 21 become substantially the same, and an effect that an even richer tone and volume can be obtained is obtained.

Further, in this embodiment, the weight is reduced by using a metal plate 15 which is approximately half in weight instead of the conventional piano frame. For this reason, the force for supporting the string tension is weaker than when a conventional piano frame is used. However, by adopting the structure including the second soundboard 21 in addition to the first soundboard 11, the tone and volume are reduced. It has the effect of being improved to be equal to or better than a normal piano.

It should be noted that the embodiments of the present invention are not limited to the above-described embodiments at all, and it goes without saying that various forms can be adopted as long as they fall within the technical scope of the present invention.
For example, in the above-described embodiment, a piano having a size smaller than that of a conventional piano is used. In this case, there is an effect that a richer tone and volume can be obtained as compared with a conventional piano.

The vibration transmitting member 31 is not necessarily
Need not be provided along, for example, may be provided regardless of the position of the piece 6. Further, it is not always necessary to provide the vibration transmitting member 31, and the vibration transmitting member 31 may be omitted. In this case, the vibration of the first soundboard 11 is transmitted to the second soundboard 21 via air.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an upright piano of the present embodiment.

FIG. 2 is a view as viewed from A in FIG.

FIG. 3 is a schematic explanatory diagram of first and second sound boards.

FIG. 4 is a schematic explanatory diagram of first and second sound boards.

FIG. 5 is a sectional view of a conventional upright piano.

FIG. 6 is a view as viewed from B in FIG. 5;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Keyboard, 2 ... Action mechanism, 3 ... Hammer, 3a ... Stringing part, 5 ... String, 6 ... Piece,
6a ... long piece, 6b ... short piece, 10 ... upright piano, 11 ... first soundboard, 12 ... first hit, 13 ... first sound stick, 15 ... Metal plates, 1
6 ... Pin plate, 17 ... Tuning pin, 18
..Pin pin, 19: hitch pin, 21: second soundboard, 22: second hit, 23 ... second sound stick, 31
... Vibration transmitting member, 41 ... Strut assembly, 42 ...
Prop, 43 ... girder, 44 ... box, 45 ... base,
46 ... string holding, 47 ... fore side bearing,
48 Back side bearing.

Claims (4)

[Claims] 1. A first soundboard attached to a front side of a support, and a second soundboard attached to a back side of the support, wherein string vibration of a piano is transmitted to the first soundboard. The soundboard structure of an upright piano, wherein the soundboard structure is also transmitted to the second soundboard. 2. The soundboard structure of an upright piano according to claim 1, wherein said first soundboard and said second soundboard are connected by a vibration transmitting member. 3. The sound transmission member according to claim 2, wherein the vibration transmission member connects the first sound board and the second sound board at a position of a piece joined to the first sound board. Upright piano soundboard structure. 4. The sound of an upright piano according to claim 1, wherein the piano frame has a shape in which only the hitch pin side is omitted and the tuning pin side is omitted. Board structure.