JP2002341860A - Pedestal for piano - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pedestal for a piano which can realize the emission of excellent timbres by the piano and can minimize the expenses and time required for the same. SOLUTION: Porcelain ceramics is used for the material of the pedestal 20 for the piano and the segment in contact with a floor surface is provided with a buffer layer 3 consisting of closed cell foamed plastic.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a pedestal for a piano.

[0002]

2. Description of the Related Art Conventionally, when a piano is installed, a moving roller provided on the bottom surface of the piano is mounted on a pedestal for the piano. The piano pedestal is used exclusively for the purpose of preventing the piano from moving, and is made of wood or resin.

[0003]

However, in the above-mentioned conventional pedestal for a piano, the influence of the pedestal for the piano on the tone of the piano has hardly been considered. For this reason, in order to realize the tone of the piano desired by the player and the audience of the piano, changing to a piano emitting a superior tone and improving the acoustic environment of the room where the piano is installed have been performed. However, such measures require a lot of expense and a lot of time.

The present invention has been made in view of the above-mentioned conventional circumstances, and makes it possible to realize an excellent tone of a piano, thereby reducing the cost and time required for the piano. Providing a pedestal is an issue to be solved.

[0005]

Means for Solving the Problems In order to solve the above-mentioned problems, the present inventors have prepared a piano pedestal from many materials,
We conducted intensive research on the relationship between the material and the tone of the piano. As a result, it has been found that the above-mentioned problems can be solved by using ceramics as the material of the piano pedestal. Further, the present inventors have found that the above-mentioned problems can be solved even if a material having the same density and rigidity as the ceramic is used instead of ceramics, and have completed the invention.

That is, the piano pedestal of the present invention is characterized by being made of ceramics or a material having the same density and rigidity as these.

According to the test of the inventors, if the material of the pedestal for the piano is made of ceramics or a material having the same density and rigidity as that of the ceramics, the frequency characteristic is higher than when a material different from that is used. Becomes sharper, and the sound generated from the strings when the piano keys are hit can be reproduced more faithfully. This tendency is particularly noticeable in the middle to high range of the piano. And also in the sensory test, it was demonstrated that when the piano pedestal of the present invention was used, the contour of the sound became clear and the sound of the piano was improved.

Therefore, the use of the piano pedestal of the present invention makes it possible to realize the piano tone desired by a piano player or an audience. In addition, the cost required for this is significantly lower than the cost of changing the piano or improving the acoustic environment of the room in which the piano is installed. Further, since the work is completed only by replacing the piano pedestal, the work can be completed in an extremely short time.

Therefore, by using the piano pedestal of the present invention, it is possible to realize that the piano emits an excellent tone, and the cost and time required for that can be reduced.

The material of the piano pedestal of the present invention may be ceramics, ceramics, porcelain ceramics, or porous ceramics. Further, as the material of the piano pedestal of the present invention, a material obtained by impregnating a porous ceramic with a resin, a material obtained by combining a metal, a filler such as a fiber with a metal, or the like can be used. According to the tests by the inventors, the effects of the present invention can be obtained if the material has the same density and rigidity as ceramics.

Among these, it is particularly preferable to use porcelain ceramics. In this case, the effects of the present invention can be obtained most, and the strength can be made sufficient as a piano pedestal, and the design can be excellent. In particular, when the glaze layer is formed on the surface, it is possible to freely decorate, and it is also possible to realize a design according to the preference of the player and the audience of the piano.

[0012] As the porcelain ceramic, a base material having a composition within the following range can be adopted. <Mixing ratio of base material (parts by mass)> Kaolin mineral: 30 to 70 Quartz: 30 to 60 Feldspar: 5 to 25

[0013] The piano pedestal of the present invention is preferably provided with a cushioning layer made of a foam at a portion in contact with the floor surface. In this case, the rate of sound propagation from the piano to the floor can be reduced, and the reflection of the piano sound reflected on the floor can be prevented from causing discomfort to the piano player or the audience. it can. In addition, as the buffer layer, an elastic body such as rubber is also conceivable, but according to the test of the inventors, the elastic body without bubbles has a higher sound absorbing effect than the foam, so the foam is superior. .

The foam is preferably a single-cell foamed plastic. According to the tests by the inventors, if a single-cell foamed plastic is used as the foam, the frequency characteristics become particularly sharp, and the sound generated from the strings of the piano can be reproduced more faithfully. And also in the sensory test, it was proved that the outline of the sound became clearer and the sound of the piano became better.

[0015]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing an embodiment of the present invention; FIG.

(Embodiment) First, as shown in FIGS. 1 and 2, a piano pedestal main body 1 made of a base having the following composition is prepared. The piano pedestal main body 1 has a substantially truncated cone shape having a diameter of 190 mm and a height of 25 mm, and a circular recess 11 having a diameter of 80 mm and a depth of 16 mm is formed concentrically at the upper center. A peripheral surface 12 is provided to be inclined downward in a radially outward direction from the outer periphery of the concave portion 11, and a peripheral edge 13 of the peripheral surface 12 protrudes toward the bottom surface in the axial direction. The bottom surface 11a on the back side of the concave portion 11 and the bottom surface 13a of the peripheral edge 13 are flush with each other. It should be noted that the peripheral surface 12 was prepared not only with no pattern but also with a relief pattern formed by pressing.

<Mixing ratio of base material (parts by mass)> Kaolin mineral: 50 Quartz: 45 Feldspar: 15

A glaze is applied only to the surface of the pedestal base 1, and after drying, it is sintered at about 1210 ° C. In this way, as shown in FIG. 3, a pedestal 10 made of a porcelain ceramic having the glaze layer 2 was manufactured. The glaze layer 2 was black and blue when the peripheral surface 12 of the piano pedestal main body 1 had no pattern, and was colored when the peripheral pattern 12 had a relief pattern.

Further, the bottom surface 1 of the obtained piano pedestal 10
A 3 mm-thick urethane foam having a thickness of 3 mm is attached to 1 a and the bottom surface 13 a with an adhesive to form a buffer layer 3.
Thus, the piano pedestal 20 of the embodiment shown in FIG. 4 is obtained.

Comparative Example A commercially available plastic pedestal for piano having substantially the same shape as that of the embodiment (Yamaha Corporation)
Product name: Piano N3-M accessory insulator) was prepared and used as a comparative product.

(Test) Regarding the above-mentioned actual product and comparative product,
Using a domestic upright piano, a frequency characteristic test, a reverberation characteristic test, and a sensory evaluation test were performed.

The frequency characteristic test and the reverberation characteristic test were performed using a sound level meter capable of frequency analysis. That is, the measurement microphone is 90 cm from the floor and 100 mm from the piano.
cm, and hit the keyboard of the piano.
Low tone (28 Hz), medium tone (262 Hz) and high tone (41
The test was performed by generating three sounds of 86 Hz each. The setting of the sound level meter was such that the sampling time was 50 ms and the trigger level was 40 dB. The frequency characteristic test was performed by measuring each frequency sound pressure distribution at a timing indicating the maximum value of the sampled data. Further, the reverberation measurement test was performed by measuring a time change of an average sound pressure in a measurement frequency range.

In the sensory evaluation test, three sounds, a low tone (28 Hz), a middle tone (262 Hz) and a high tone (4186 Hz), are generated independently by striking a piano keyboard, and these sounds are A, B and C. The evaluation was performed by three subjects. The evaluation method was evaluated in five steps from 1 of the lowest evaluation to 5 of the highest evaluation, assuming that the evaluation using the pedestal for piano of the comparative product was 3.

(Evaluation) <Frequency Characteristics Test> The test results are shown in FIGS.

As can be seen from FIGS. 5 and 6, in the case of high and medium tones, the frequency characteristics are sharper in the case of using the embodiment product than in the case of using the comparison product, and when the piano keyboard is hit. It can be seen that the sound generated from the strings can be reproduced more faithfully. However, as shown in FIG. 7, there was no significant difference between the two in the bass. From these facts, it can be understood that the frequency characteristics of the embodiment product, especially in the middle to high frequency range, are improved.

Therefore, it can be understood that the use of the piano pedestal 20 of the embodiment makes it possible to realize the piano tone desired by the piano player and the audience. Further, the cost required for this is very small, and the work of replacing the piano pedestal can be completed in a very short time.

<Reverberation Characteristics Test> The test results are shown in FIGS.

As can be seen from FIGS. 8 to 10, no significant difference was observed in the reverberation characteristics between the actual product and the comparative product.

<Sensory Evaluation Test> The test results are shown in FIGS.
Shown in

As can be seen from FIGS. 11 to 13, two out of three persons had a rating of 4 for the low and medium sounds, and the other had a rating of 3. In the case of the treble, one of the three had a rating of 4, and the other two had a rating of 3. From the above results, it was found that the tone was sensually superior when using the comparative product, even when using the comparative product, in any of the high range, middle tone, and low range.

[Brief description of the drawings]

FIG. 1 is a plan view of a piano pedestal main body of an embodiment.

FIG. 2 is a cross-sectional view of a main body of the piano pedestal according to the embodiment.

FIG. 3 is a sectional view of a piano pedestal.

FIG. 4 is a sectional view of a piano pedestal according to an embodiment.

FIG. 5 is a graph showing a relationship between a frequency and a sound pressure in a treble sound of the example and the comparative example.

FIG. 6 is a graph showing the relationship between the frequency and the sound pressure in the middle sound of the example and the comparative example.

FIG. 7 is a graph showing a relationship between a frequency and a sound pressure in a low sound of the example and the comparative example.

FIG. 8 is a graph showing a relationship between an average sound pressure in a measurement frequency range and a time in a treble of Examples and Comparative Examples.

FIG. 9 is a graph showing the relationship between the average sound pressure in the measurement frequency range and the time in the middle sound of the example and the comparative example.

FIG. 10 is a graph showing the relationship between the average sound pressure in the measurement frequency range and the time in the low range of the example and the comparative example.

FIG. 11 is a graph showing the results of a sensory evaluation test on treble in Examples and Comparative Examples.

FIG. 12 is a graph showing the results of a sensory evaluation test on middle sounds of Examples and Comparative Examples.

FIG. 13 is a graph showing the results of a sensory evaluation test on bass in Examples and Comparative Examples.

[Explanation of symbols]

 10, 20: pedestal for piano 2: glaze layer 3: buffer layer

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Kato Ishida 5-1-1 Koie Honcho, Tokoname, Aichi Prefecture Inax Corporation (72) Inventor Kazuo Takeuchi 5-1-1 Koie Honcho, Tokoname, Aichi Co., Ltd. Inax (72) Inventor Keisuke Yamamoto 5-1-1 Koie Honcho, Tokoname, Aichi Pref. Inax Co., Ltd. (72) Inventor Takeshi 5-1-1 Koie Honcho, Tokoname, Aichi Pref. Inax Co., Ltd.

Claims (5)

[Claims] 1. A piano pedestal made of ceramics or a material having the same density and rigidity as the ceramics. 2. The piano pedestal according to claim 1, wherein the pedestal is a porcelain ceramic. 3. The piano pedestal according to claim 2, wherein a glaze layer is formed on the surface. 4. The pedestal for a piano according to claim 1, wherein a cushioning layer made of a foam is provided at a portion in contact with the floor surface. 5. The pedestal for a piano according to claim 4, wherein the foam is a single-cell foam plastic.