JP2022032931A - Japanese harp with double sound board - Google Patents

Abstract

To provide a Japanese harp with a double sound board.SOLUTION: A Japanese harp with a double sound board includes a resonance box. The box body of the resonance box is obtained by laminating a surface plate (1), a bottom plate (2) and a side plate (3). A resonance body is provided within the box body. Two upper soundboards (6) are provided to be fixed side by side in an inner wall of the surface plate (1). In the inner wall of the surface plate (1), a first groove (8) is provided, and an upper sound port is formed.SELECTED DRAWING: Figure 9

Description

The present invention relates to a plucked string instrument, and particularly to a double soundboard Japanese koto.

The Japanese koto is a plucked string instrument, and at the beginning of the 8th century, the 13-string koto was introduced to Japan from China's Tang, and has evolved into traditional Japanese instruments such as the music koto, Tsukushi koto, and folk koto. The structure of the three is basically the same, 13 strings are stretched on the surface of a rectangular sound box made of paulownia wood, and each string is supported by one pillar. The names of the strings are called "1, 2, 3, 4, 5, 6, 7, 8, 9, 10, Doo, Tame, Width" from the other side of the instrument when viewed from the performer's side, and the main body is straight. Is. The length of the Japanese koto is about 180 cm, it has 13 strings, and the strings are erected with 13 movable pillars, and the performer adjusts the pitch by moving the position of the pillars as needed. can do. At the time of performance, put a "koto claw" on the thumb, index finger, and middle finger and pull the strings to play.

The earliest standard Japanese koto has 13 strings. Currently, 17-string koto is also used, and there is also a 25-string koto. Naturally, the main body is basically similar to the Chinese koto, and the main material of the main body is paulownia wood. 1 to 7 will be referred to. The box body of the Japanese koto body is mainly made by laminating a surface plate 1, a bottom plate 2 and a side plate 3, a front sealing plate 4 is installed at one end of the box body, and a rear sealing plate 5 is installed at the other end. The space surrounded by the surface plate 1, the bottom plate 2, the side plate 3, the front sealing plate 4 and the rear sealing plate 5 is a resonance cylinder, and three sound plates 24 are installed laterally in the resonance cylinder. There is.

The pitch of the Japanese koto with 13 strings is divided into two octaves, and there is a problem that the timbre of the treble and bass is not good. Specifically, the treble range is not bright and the bass range is not thick enough. In addition, the penetrating power of the Japanese koto koto is weak, and further improvement is needed. The main reason is that the Japanese sound box cannot meet the demands of good resonance and vibration from the high range to the low range, that is, it adapts to a wide range of frequency changes in the high range, midrange and low range at the same time. Unable to satisfy resonance and vibration. Further research has shown that there are many factors that affect resonance and vibration in the sound box, and that in addition to the material and thickness of the surface and bottom plates, the internal structure and mechanism of the sound box also have a large effect. Since the design of the conventional Japanese koto sound box is not rational, it is difficult to exhibit good sound resonance and vibration from the high range to the low range.

In view of these, it is a research subject of the present invention how to improve the resonance cylinder of the conventional Japanese koto, and particularly to improve the internal structure and mechanism of the resonance cylinder.

The present invention provides a double soundboard Japanese koto, and an object of the present invention is to solve the problem that the resonance cylinder of a conventional Japanese koto cannot have a good resonance tone and penetrating power at the same time in the high, middle and low range. ..

In order to achieve the above object, the technical solution used in the present invention is a double soundboard Japanese sword, which includes a resonance box, and the box body of the resonance box is made by laminating a surface plate, a bottom plate and a side plate. A front sealing plate is installed at one end of the box, a rear sealing plate is installed at the other end, and the space surrounded by the surface plate, bottom plate, side plate, front sealing plate, and rear sealing plate resonates. It is a body, and the innovation point is that two sound boxes are installed in the sound box, the sound box is a long sound box member, and one side of the two sound boxes is a surface plate. Closely fixed to the inner wall, the other side of the two sound boxes hangs inside the sound box with respect to the bottom plate, and the longitudinal direction of the two sound boxes coincides with the longitudinal direction of the resonance box, and the resonance box. When observed from the width direction of, the two sound boxes are in parallel and are separated from each other by a certain distance.

A first groove is installed on the inner wall of the surface plate corresponding to the sound box, the first groove is opened along the width direction of the resonance box, and a second groove is installed on the inner wall of the surface plate corresponding to the sound box. , The second groove is opened along the longitudinal direction of the resonance box, the first groove and the second groove are arranged so as to intersect the inner wall of the surface plate and penetrate each other, and the second groove is between the two soundboards. Located, the longitudinal direction of the second groove coincides with the longitudinal direction of the soundboard, and the first groove straddles the two soundboards in the width direction of the resonance box and forms an upper horizontal sound box on the inner wall of the surface plate. However, the second groove forms an upper longitudinal resonance port on the inner wall of the surface plate.

The explanation for the related contents in the above technical solution is as follows.
1. 1. In the above solution, the subject is "Japanese koto", but since the content of the innovation is concentrated on the "resonance box" of Japanese koto, other structures other than the resonance box are not explained. It is considered that the structure other than the resonance box in the Japanese koto according to the present invention is realized by using the conventional Japanese koto technique.

2. 2. In the above-mentioned solution, the "resonance box" refers to a main body made by laminating a surface plate, a bottom plate and a side plate. The longitudinal direction of the resonance box of the Japanese koto points to the direction that substantially coincides with the strings, and the width direction of the resonance box refers to the direction perpendicular to the longitudinal direction. "Inner wall" refers to the inner wall surface of the sound box, for example, the inner wall of the surface plate refers to the wall surface close to the inside of the surface plate of the sound box, and the inner wall of the bottom plate refers to the wall surface close to the inside of the bottom plate of the sound box.

3. 3. In the above solution, two soundboards may be installed in the sound box, the soundboard is a long soundboard member, and one side of the two soundboxes is on the inner wall of the bottom plate. Closely fixed, the other side of the two sound boxes extends into the sound box with respect to the surface plate, the longitudinal direction of the two sound boxes coincides with the longitudinal direction of the resonance box, and the resonance box. When observed from the width direction of, the two sound boxes are in parallel and are separated by a certain distance.

A third groove is installed on the inner wall of the bottom plate corresponding to the sound box, the third groove is opened along the width direction of the resonance box, and a fourth groove is installed on the inner wall of the bottom plate corresponding to the sound box. The four grooves are opened along the longitudinal direction of the resonance box, the third groove and the fourth groove are arranged so as to intersect the inner wall of the bottom plate and penetrate each other, and the fourth groove is located between the two soundboards. The longitudinal direction of the 4th groove coincides with the longitudinal direction of the sound box, and the 3rd groove straddles the two sound boxes in the width direction of the resonance box to form a lower transverse sound port on the inner wall of the bottom plate. The groove forms a lower longitudinal sound box on the inner wall of the bottom plate.

4. In the above-mentioned solution, a sound box may be installed in the sound box, the sound board is in the form of a sheet, the sound board is arranged at the position of the first groove, and the central surface of the second groove is used as a reference. The top of the sound box is connected to be fixed to the surface plate, the bottom of the sound box is connected to be fixed to the bottom plate, and the side of the sound box is the side plate of the corresponding side. It is connected so as to be fixed to.

5. In the above solution, an upper piece may be installed on the upper soundboard, one side of the upper soundboard of the upper piece is a notch, and the upper soundboard is formed with an upper piece type soundboard structure. It is erected in the first groove. The lower bridge may be installed on the lower bridge, one side of the lower bridge is a notch, the lower bridge forms a lower bridge type soundboard structure, and the lower bridge is erected in the third groove. do.

6. In the above-mentioned solution, an upper reinforcing plate may be installed between the two upper soundboards, and a lower reinforcing plate may be installed between the two upper soundboards so that the upper reinforcing plate is fixed between the two upper soundboards. The lower reinforcing plate may be erected so as to be fixed between the two upper soundboards.

7. In the above solution, the soundboard is arranged laterally in the sound box, and a string hole is provided in the center of the sound box. A first notch is installed on the connecting side of the soundboard and the surface plate and the side plate, and a first half-moon hole is formed between the first notch and the inner wall of the surface plate and the side plate in the assembled state, and the soundboard and the side plate are formed. A second notch is installed on the connecting side of the bottom plate and the side plate, and a second half-moon hole is formed between the second notch and the inner wall of the bottom plate and the side plate in the assembled state.

8. In the above-mentioned solution, it is optimal that the first groove, the second groove, the third groove and the fourth groove are all arcuate grooves.

For Japanese koto, there are many factors that affect the tone and penetration, for example, the material, thickness, and internal structure of the resonance box. In the present invention, in order to solve the problem that the resonance cylinder of the conventional Japanese koto cannot consider good resonance tone and penetration force at the same time in the high, middle and low frequencies, the angle of the internal mechanism of the resonance box, especially the resonance cylinder is mainly used. The Japanese koto has been thoroughly improved. Specifically, it is embodied in the following several aspects. 1. Two soundboards are installed in parallel on the inner wall of the surface plate inside the sound box, and 2. Grooves (that is, first groove and second groove) are installed on the inner wall of the surface plate inside the sound box. ) Has been established, and an upper horizontal sound box and an upper vertical sound box are formed on the inner wall of the surface plate in the groove. The present invention solves the problem that the treble range of the conventional Japanese sardine is not bright, the bass range is not thick enough, and the penetration force of the kotone is low. The mechanism was examined and studied in detail, and the main reason for the low tone and volume of the conventional Japanese sardine in the high and low frequencies and the low penetration force is that the design of the resonance box, especially the sound box, is not rational. It was found that the sound box cannot generate good resonance and vibration in the sound box during performance. Thereby, the inventor breaks the limitation of the traditional resonance box (especially sound box) design of the conventional Japanese koto, and proposes an improved design method of the present invention. This solves the problem that the high range of the Japanese koto is not bright due to the angles of vibration, resonance, and sound output, the low range is not thick enough, and the penetration of the koto is low. The improved design method has outstanding substantive features and remarkable technological progress, and has been proved by practice to obtain a clear technical effect.

Since the above technical solution is used, the present invention has the following advantages and effects as compared with the conventional resonance box of Japanese koto (described by using the optimum embodiment, that is, the content of the embodiment of the present invention). ..
1. 1. In one embodiment of the present invention, a double soundboard structure is installed in the center of both the surface plate and the bottom plate (that is, two upper soundboards are installed in parallel on the inner wall of the surface plate, and the inner wall of the bottom plate is equipped with two soundboards. Two soundboards are installed in parallel). Since the bass has a larger amplitude and a lower frequency than the treble, the bass resonance is concentrated in the central region of the resonance box, and the treble resonance is concentrated in the peripheral edge region of the resonance box. Strengthening the strength of the central region of the surface and bottom plates plays an important role in improving bass tone and penetration. On the other hand, strengthening the strength of the central region of the surface plate and the bottom plate changes the thickness discrimination between the central region and the peripheral edge region of the resonance box, and for the improvement of the timbre and penetration in the high frequency range. Also works well.

2. 2. In one embodiment of the present invention, three grooves along the width direction of the resonance box and one groove along the longitudinal axis (that is, the first groove and the second groove) are formed on the inner wall of the surface plate, and these are formed. The groove actually forms a sound box on the inner wall of the surface plate. At the same time, three grooves along the width direction of the resonance box and one groove along the length intersecting these grooves (that is, the third groove and the fourth groove) are opened on the inner wall of the bottom plate, and these grooves are actually the bottom plate. A sound box is formed on the inner wall of the building. Bass has a larger amplitude and lower frequency than treble, so bass resonance is concentrated in the central region of the resonance box, treble resonance is concentrated in the peripheral edge region of the resonance box, and string vibrations intersect the sound box. It converges from the central region and quickly propagates around the sound box through the two upper and lower sound boxes (ie, the sound tunnel), which plays an important role in improving the timbre and penetration of the high frequency range, and at the same time, the low frequency range. It has a good effect on improving the tone and penetration.

3. 3. In one embodiment of the present invention, the soundboard is designed to have a piece-type soundboard structure, and in particular, a notch is designed on one side of the soundboard, so that the soundboard looks like an arch structure. Such a soundboard is erected in the sound box and is more useful for the transmission of vibration by the sound box, and at the same time, it is more useful for the resonance of the resonance box.

4. In one embodiment of the present invention, the design of three laterally arranged soundboards is utilized. When looking down on the resonance box, these soundboards are combined with two soundboards to divide the space corresponding to the inner wall of the surface plate into eight resonance regions, and at the same time these soundboards are two. In combination with the soundboard, the space corresponding to the inner wall of the bottom plate is divided into eight resonance regions to form a total of 16 resonance regions. When playing Japanese sushi, the vibration of the strings is first transmitted to the central region where the sound boxes intersect, and then transmitted to the 16 resonance regions by the sound boxes, causing resonance and vibration, which causes the sound of the strings to be transmitted to the resonance box. Amplifies to the resonance sound of. Before the improvement, when playing Japanese sine, only 6 sound waves can be generated, that is, 3 soundboards divide the sound box into 4 resonance regions, and each resonance region produces 1 sound wave. One chord wave amount is added, and one emission wave amount is further added, so that there are a total of six sound wave amounts. After the improvement, 18 sound waves can be generated when playing the Japanese sardine according to the present invention, 16 resonance regions generate 16 sound waves, 1 chord wave amount is added, and further. There are a total of 18 sound wave volumes, including one emission wave amount. The sound wave amount is the number of sound waves, that is, for a specific resonance box stringed instrument, it is mainly determined by the number of resonance regions in the resonance box, excluding one string wave amount and one emission wave amount. Generally, the instrument generates one sound wave amount in each resonance region when playing, and the number of resonance regions and the generated sound wave amount are the same. In addition, the amount of sound wave directly affects the timbre, penetration and volume of the musical instrument. Therefore, the design of the present invention can clearly improve the timbre of the high and low frequencies and increase the penetrating power of the high and low frequencies.

5. The string hole and the crescent hole between the soundboard and the surface plate and the bottom plate of the soundboard according to the embodiment of the present invention are passages between each resonance region in the sound box, and the design of such a passage is provided. Is useful for mutual transmission of sound, resonance and vibration.

6. In one embodiment of the present invention, an upper reinforcing plate is erected between two upper soundboards, a lower reinforcing plate is installed between the two upper soundboards so that the upper reinforcing plate is fixed, and two lower reinforcing plates are provided between the two lower soundboards. Install so that the lower reinforcing plate is fixed between the lower soundboards of the book. As its action, one can increase the strength in the central region of the surface plate and the bottom plate, especially between the soundboard and the soundboard, and two can increase the strength between the two soundboards and the two soundboards. The load can be increased, and the tone and volume of the bass range can be improved. On the other hand, increasing the central region of the sound box and, relatively speaking, increasing the difference in strength from the peripheral edge region of the resonance box is also useful for improving the timbre and penetrating power in the high frequency range.

7. In one embodiment of the present invention, arcuate grooves are used for the first groove, the second groove, the third groove, and the fourth groove, so that the change in the thickness of the surface plate and the bottom plate can be minimized. Affects the resonance and vibration of the resonance box.

Both of the above advantages and effects will be explained in the optimum form, but it is particularly important to emphasize that for the present invention, the measures for installing the double soundboard structure on the inner wall of the surface plate and opening the groove are the same for the inner wall of the bottom plate. It is more important than using measures, and relatively better in action and effect. The reason is that the strings are installed on the front plate and the bottom plate does not connect directly to the strings. Therefore, installing a double soundboard structure on the inner wall of the surface plate and opening a groove is an important point for solving the technical problem of the present invention, and installing the double soundboard structure on the inner wall of the bottom plate, The opening of the groove serves as an auxiliary to the present invention and can be easily understood by those skilled in the art.

It is a front view of the conventional Japanese koto resonance box. It is a block diagram of the inner wall of the surface plate of the conventional Japanese koto resonance box. It is a block diagram of the inner wall of the bottom plate of the conventional Japanese koto resonance box. It is sectional drawing of the conventional Japanese koto resonance box. It is a figure which shows the box body of the resonance box in FIG. It is a figure which shows the sound board of the resonance box in FIG. It is a left side view of FIG. It is a front view of the Japanese koto resonance box which concerns on embodiment of this invention. It is a front view of the inner wall of the surface plate of the Japanese koto resonance box which concerns on embodiment of this invention. It is a front view of the inner wall of the bottom plate of the Japanese koto resonance box which concerns on embodiment of this invention. It is sectional drawing of the Japanese koto resonance box which concerns on embodiment of this invention. 11 is a cross-sectional view of the box body of the resonance box in FIG. 11. It is a front view of the horizontal sound board of a Japanese koto which concerns on embodiment of this invention. It is a left side view of the horizontal sound board of the Japanese koto which concerns on embodiment of this invention. It is a front view of the soundboard of a Japanese koto which concerns on embodiment of this invention. It is a left side view of the soundboard of a Japanese koto which concerns on embodiment of this invention. It is a front view of the lower soundboard of a Japanese koto which concerns on embodiment of this invention. It is a left side view of the lower soundboard of a Japanese koto which concerns on embodiment of this invention.

Hereinafter, the present invention will be further described in combination with drawings and examples.
Example: Double soundboard Japanese koto Since all the innovations of the present invention are concentrated in the resonance box, this embodiment will focus on the structure and mechanism of the resonance box of the Japanese koto, and the other structures will be the prior art. Therefore, the description thereof will be omitted in this embodiment.

As shown in FIGS. 8 to 18, the structure and mechanism of the resonance box of the Japanese sardine according to this embodiment are such that the box body of the resonance box has a surface plate 1, a bottom plate 2 and a side plate 3 bonded together (see FIG. 12). A front sealing plate 4 is installed at one end of the box body, and a rear sealing plate 5 is installed at the other end (see FIG. 8). The space surrounded by the rear sealing plate 5 is a sound box (see FIG. 8).

Two soundboards 6 and two soundboards 7 are installed in the sound box (see FIG. 11), and both the soundboard 6 and the soundboard 7 are long soundboard members. Yes (see FIGS. 15-18). An upper piece 12 is installed on the upper soundboard 6, and one side of the upper soundboard 6 of the upper piece 12 is a notch, and the upper soundboard 6 is formed with an upper piece type soundboard structure (see FIG. 15). ), The upper piece 12 is erected in the first groove 8 (see FIG. 9). The lower bridge 13 is installed on the lower bridge 7, and one side of the lower bridge 7 of the lower bridge 7 is a notch, and the lower bridge 7 forms a lower bridge type soundboard structure (see FIG. 17). , The lower bridge 13 is erected in the third groove 10 (see FIG. 10). One side of the two soundboards 6 is closely fixed to the inner wall of the surface plate 1 (see FIG. 11), and the other side of the two soundboards 6 hangs in the sound box with respect to the bottom plate 2. The longitudinal direction of the two soundboards 6 coincides with the longitudinal direction of the resonance box, and when observed from the width direction of the resonance box, the two soundboards 6 are parallel and separated by a certain distance (). See FIG. 9). One side of the two soundboards 7 is closely fixed to the inner wall of the bottom plate 2 (see FIG. 11), and the other side of the two soundboards 7 extends into the sound box with respect to the surface plate 1. The longitudinal direction of the two soundboards 7 coincides with the longitudinal direction of the resonance box, and when observed from the width direction of the resonance box, the two soundboards 7 are parallel and separated by a certain distance. (See FIG. 10).

Three first grooves 8 are installed on the inner wall of the surface plate 1 corresponding to the sound box (see FIG. 9), and all three first grooves 8 are opened along the width direction of the resonance box. The first grooves 8 are arranged at intervals in the longitudinal direction of the resonance box. At the same time, one second groove 9 is installed on the inner wall of the surface plate 1 corresponding to the sound box (see FIG. 9), and the second groove 9 is opened along the longitudinal direction of the resonance box, and the second groove 9 is formed. Is located in the center of the width direction of the resonance box. The three first grooves 8 and the one second groove 9 penetrate each other in the inner wall of the surface plate 1, the second groove 9 is located between the two soundboards 6, and the longitudinal direction of the second groove 9 is. Consistent with the longitudinal direction of the soundboard 6, the three first grooves 8 straddle the two soundboards 6 in the width direction of the resonance box, and form three upper horizontal sound ports on the inner wall of the surface plate 1. The second groove 9 forms an upper longitudinal sound box on the inner wall of the surface plate 1 (see FIG. 9).

The length of the first groove 8 is smaller than the length of the position where the surface plate 1 in the resonance cylinder corresponds to the first groove 8 (see FIG. 9), and both ends of the first groove 8 and the inner wall of the surface plate 1 A smooth transition surface is installed between them. The length of the second groove 9 is smaller than the length of the position where the surface plate 1 in the resonance cylinder corresponds to the second groove 9, and both ends of the second groove 9 and the inner wall of the surface plate 1 are smooth. A transitional surface is installed (see FIG. 9).

Three third grooves 10 are installed on the inner wall of the bottom plate 2 corresponding to the sound box (see FIG. 10), and all three third grooves 10 are opened along the width direction of the resonance box, and the three third grooves 10 are provided. The three grooves 10 are arranged at intervals in the longitudinal direction of the resonance box. At the same time, one fourth groove 11 is installed on the inner wall of the bottom plate 2 corresponding to the sound box (see FIG. 10), the fourth groove 11 is opened along the longitudinal direction of the resonance box, and the fourth groove 11 is It is located in the center of the width direction of the resonance box. The three third grooves 10 and the one fourth groove 11 penetrate each other in the inner wall of the bottom plate 2 (see FIG. 10), and the fourth groove 11 is located between the two soundboards 7 and is the fourth groove. The longitudinal direction of 11 coincides with the longitudinal direction of the lower soundboard 7, and the three third grooves 10 straddle the two lower soundboards 7 in the width direction of the resonance box, and the three lower horizontal sound openings on the inner wall of the bottom plate 2. The fourth groove 11 forms a lower longitudinal sound box on the inner wall of the bottom plate 2 (see FIG. 10).

The length of the third groove 10 is smaller than the length of the position where the bottom plate 2 in the resonance cylinder corresponds to the third groove 10 (see FIG. 10), and between both ends of the third groove 10 and the inner wall of the bottom plate 2. All have a smooth transition surface. The length of the fourth groove 11 is smaller than the length of the position where the bottom plate 2 in the resonance cylinder corresponds to the fourth groove 11 (see FIG. 10), and between both ends of the fourth groove 11 and the inner wall of the bottom plate 2. All have a smooth transition surface.

The shape formed by the first groove and the second groove on the inner wall of the surface plate 1 and the shape formed by the third groove and the fourth groove on the inner wall of the bottom plate 2 correspond to each other in the height direction of the resonance box. .. The soundboard 16 is provided at six positions of the three horizontal left halves and the three horizontal right halves in the shape formed by the first groove and the second groove and the shape formed by the third groove and the fourth groove, respectively. Installed (see FIG. 9), each of the six soundboards 16 is in the form of a sheet (see FIGS. 13 and 14), and the upper part of each soundboard 16 is in the portion corresponding to the surface plate 1. Connected to be fixed, the bottom of each soundboard 16 is connected to be fixed to the part corresponding to the bottom plate 2, and the side part of each soundboard 16 is connected to be fixed to the part corresponding to the side plate 3. (See FIG. 11). The soundboard 16 is arranged laterally in the sound box, and a string hole 23 is provided in the center of the sound box 16 (see FIG. 13). A first notch 19 is installed on the connecting side of the soundboard 16 and the surface plate 1 and the side plate 3 (see FIG. 13), and is between the first notch 19 and the inner wall of the surface plate 1 and the side plate 3 in the assembled state. The first half-moon hole 20 is formed in (see FIG. 11). A second notch 21 is installed on the connecting side of the soundboard 16 and the bottom plate 2 and the side plate 3 (see FIG. 13), and in the assembled state, a second notch 21 is provided between the second notch 21 and the inner wall of the bottom plate 2 and the side plate 3. Two half-moon holes 22 are formed (see FIG. 11).

An upper reinforcing plate 17 is erected between the two soundboards 6 so as to be fixed between the two soundboards (see FIGS. 9 and 11), and between the two soundboards 7. The lower reinforcing plate 18 is erected so as to be fixed between the two lower sounding plates (see FIGS. 10 and 11). The first groove 8, the second groove 9, the third groove 10, and the fourth groove 11 are all arcuate grooves.

Hereinafter, the other implementation status and structural changes of the present invention will be described as follows.
1. 1. In the above embodiment, when observed from the width direction of the resonance box, the two soundboards 6 are parallel and parallel (see FIG. 9). The two soundboards 7 are parallel and parallel (see FIG. 10). However, the present invention is not limited to these, and the two upper soundboards 6 are not always parallel, and the two lower soundboards 7 are not always parallel, but they are installed in parallel. It is best to be there. It is easy for those skilled in the art to understand and accept.

2. 2. In the above embodiment, a double soundboard structure is installed on the inner walls of the surface plate 1 and the bottom plate 2, and measures such as grooves are provided in each of them. However, the present invention is not limited to these, and measures such as the double soundboard and the groove used for the inner wall of the bottom plate 2 may be canceled or changed to other structural forms, except that the effect is slightly worse. , Only the technical measures installed on the inner wall of the surface plate 1 may be withheld. The surface plate 1 is more important than the bottom plate 2 for the resonance box of the Japanese koto. The reason is that the strings are installed on the surface plate 1 and the bottom plate 2 is not directly related to the strings. It is easy for those skilled in the art to understand and accept.

3. 3. In the above embodiment, a double soundboard structure is installed on the inner walls of the surface plate 1 and the bottom plate 2. That is, two upper soundboards 6 are installed on the surface plate 1, and two lower soundboards 7 are installed on the bottom plate 2. However, the present invention is not limited to these, and in the form, two soundboards 6 can be changed to four soundboards 6 and used in parallel. For the present invention, the four soundboards 6 and the two soundboards 6 differ in number and form, but are essentially the same. When the two outer soundboards in the four upper soundboards 6 are close to the two inner soundboards, it can be equivalent to a double soundboard. Therefore, it should be understood that such changes are not considered to have any unexpected effect and are substantially equivalent. Similarly, the double soundboard structure of the bottom plate 2 should include such changes. Since the double soundboard in the present invention includes the meaning that even-numbered soundboards are arranged symmetrically, it is also within the scope of the equivalent modification of the present invention that the six soundboards are arranged symmetrically. It is easy for those skilled in the art to understand and accept.

4. In the above embodiment, three first grooves 8 are installed on the inner wall of the surface plate 1 (see FIG. 9), and three third grooves 10 are installed on the inner wall of the bottom plate 2 (FIG. 10). reference). However, the present invention is not limited to these, and the number of the first groove 8 and the third groove 10 may be one, two, four, five, or the like. Such changes can be determined according to the actual situation. In essence, the number of the first groove 8 and the third groove 10 is at least one.

5. In the above embodiment, six soundboards 16 are provided (see FIG. 9). The six soundboards 16 are divided into three sets, and each of the two soundboards 16 in each set is symmetrical with respect to the central surface of the second groove 9 (see FIG. 9). However, the present invention is not limited to these, and each set of two soundboards 16 can be combined into one soundboard 16 by interconnection, which is easy for those skilled in the art to understand and accept.

6. In the above embodiment, the upper piece 12 is installed on the upper soundboard 6, and the lower piece 13 is installed on the lower soundboard 7. However, the present invention is not limited to these, and the upper piece 12 does not have to be installed, the lower piece 13 does not have to be installed, and only one of the upper soundboard 6 and the lower soundboard 7 is pulled. You may install a piece in. It is easy for those skilled in the art to understand and accept.

7. In the above embodiment, an upper reinforcing plate 17 is erected between the two soundboards 6 so as to be fixed between the two soundboards (see FIG. 11), and between the two soundboards 7. A lower reinforcing plate 18 is erected in the room so as to be fixed between the two lower sounding plates (see FIG. 11). However, the present invention is not limited to these, and two upper sounding plates 6 may be hung inside the resonance box without installing the upper reinforcing plate 17. Similarly, the lower reinforcing plate 18 may not be installed, and the two lower sounding plates 7 may be extended inside the resonance box. The upper reinforcing plate 17 and the lower reinforcing plate 18 not only increase the central area of the surface plate and the bottom plate, and particularly increase the strength between the upper sound plate and the lower sound plate, but also increase the strength between the upper sound plate and the lower sound plate, as well as two upper sound plates and two lower resonance plates. The load at the time of resonance of the plate can be increased.

8. In the above embodiment, the first groove 8, the second groove 9, the third groove 10, and the fourth groove 11 are all arcuate grooves. However, the present invention is not limited to these, and the groove may be designed into other shapes having a concave structure such as a V shape, a U shape, and a W shape. It is easy for those skilled in the art to understand and accept.

9. In the above embodiment, when observed from the cross section of the resonance box, the positions of the two lower soundboards 7 and the two upper soundboards 6 in the vertical direction are correspondingly arranged (see FIG. 11). However, the present invention is not limited to these, and may be arranged so as not to be aligned, but the effect is optimal when arranged so as to be aligned. It is easy for those skilled in the art to understand and accept.

10. In the above embodiment, the shape and size of the two soundboards 6 are the same (see FIG. 15). The shape and size of the two soundboards 7 are the same (see FIG. 17). However, the present invention is not limited to these, and the shape and size of the two soundboards 6 may be different, and the shape and size of the two soundboards 7 may be different. Specifically, it can be determined when the resonance box adjusts the timbre and sound quality. It is easy for those skilled in the art to understand and accept.

The above-mentioned embodiment merely explains the technical idea and features of the present invention, and an object thereof is to make a person skilled in the art understand the contents of the present invention and to implement the present invention, thereby limiting the scope of protection of the present invention. I can't. Equivalent changes or modifications made in spirit and substance of the invention should be included within the scope of protection of the invention.

1 Surface plate 2 Bottom plate 3 Side plate 4 Front sealing plate 5 Rear sealing plate 6 Upper sound plate 7 Lower sound plate 8 1st groove 9 2nd groove 10 3rd groove 11 4th groove 12 Upper piece 13 Lower piece 16 Horizontal sound Plate 17 Upper reinforcing plate 18 Lower reinforcing plate 19 1st notch 20 1st half-moon hole 21 2nd notch 22 2nd half-moon hole 23 String hole 24 Soundboard

Claims (10)

The box body of the resonance box including the resonance box is formed by laminating a surface plate, a bottom plate and a side plate, and a front sealing plate is installed at one end of the box body and a rear sealing plate is installed at the other end. The space surrounded by the surface plate, the bottom plate, the side plate, the front sealing plate, and the rear sealing plate is a double soundboard Japanese koto which is a resonance cylinder.
Two sound boxes are installed in the sound box, the sound board is a long soundboard member, and one side of the two sound boxes is closely attached to the inner wall of the surface plate. The other side of the two soundboards is fixed and hangs in the sound box with respect to the bottom plate, and the longitudinal direction of the two sound boxes coincides with the longitudinal direction of the resonance box. When observed from the width direction of the resonance box, the two soundboards are in parallel and separated from each other by a certain distance.
A first groove is installed in the inner wall of the surface plate corresponding to the sound box, and the first groove is opened along the width direction of the resonance box, and the inner wall of the surface plate corresponding to the sound box is formed. A second groove is installed in the room, the second groove is opened along the longitudinal direction of the resonance box, and the first groove and the second groove are arranged so as to intersect the inner wall of the surface plate and are arranged with each other. Penetrating, the second groove is located between the two soundboards, the longitudinal direction of the second groove coincides with the longitudinal direction of the soundboard, and the first groove is in the width direction of the resonance box. The upper sound box is formed on the inner wall of the surface plate by straddling the two sound boxes, and the second groove forms the upper longitudinal sound box on the inner wall of the surface plate.
A Japanese koto characterized by that. Two sound boxes are installed in the sound box, the sound board is a long sound board member, and one side of the two sound boxes is closely fixed to the inner wall of the bottom plate. The other side of the two sound boxes hangs in the sound box with respect to the surface plate, and the longitudinal direction of the two sound boxes coincides with the longitudinal direction of the resonance box. When observed from the width direction of the resonance box, the two soundboards are in parallel and separated from each other by a certain distance.
A third groove is installed in the inner wall of the bottom plate corresponding to the sound box, the third groove is opened along the width direction of the resonance box, and the inner wall of the bottom plate corresponding to the sound box has a third groove. Four grooves are installed, the fourth groove is opened along the longitudinal direction of the resonance box, and the third groove and the fourth groove are arranged so as to intersect the inner wall of the bottom plate and penetrate each other. The fourth groove is located between the two soundboards, the longitudinal direction of the fourth groove coincides with the longitudinal direction of the soundboard, and the third groove is the two grooves in the width direction of the resonance box. The Japan according to claim 1, wherein a lower transverse sound box is formed on the inner wall of the bottom plate across the lower sound plate, and the fourth groove forms a lower longitudinal sound box on the inner wall of the bottom plate. Resonance. A sound box is installed in the sound box, the sound board is in the shape of a sheet, the sound board is arranged at the position of the first groove, and left and right with respect to the central surface of the second groove. Symmetrically, the top of the soundboard is connected to be fixed to the surface plate, the bottom of the soundboard is connected to be fixed to the bottom plate, and the sides of the soundboard are the corresponding sides. The Japanese koto according to claim 1, wherein the koto is connected so as to be fixed to the side plate of the above. An upper piece is installed on the upper soundboard, and one side of the upper piece on the upper soundboard is a notch so that the upper soundboard forms an upper piece type soundboard structure, and the upper piece is the first. It is erected in one groove,
A lower piece is installed on the lower soundboard, and one side of the lower piece on the lower soundboard is a notch so that the lower soundboard forms a lower piece type soundboard structure, and the lower piece is the first piece. The Japanese koto according to claim 2, wherein the koto is erected in three grooves. The second aspect of claim 2, wherein the upper reinforcing plate is erected between the two upper soundboards and the lower reinforcing plate is fixed between the two lower soundboards. Japanese koto. The length of the first groove is smaller than the length of the position where the surface plate in the resonance cylinder corresponds to the first groove, and both ends of the first groove and the inner wall of the surface plate are both located. A smooth transition surface is installed, the length of the second groove is smaller than the length of the position where the surface plate in the resonance cylinder corresponds to the second groove, and both ends of the second groove and the surface plate of the surface plate. The Japanese koto according to claim 1, wherein a smooth transition surface is installed between the inner wall and the inner wall. The length of the third groove is smaller than the length of the position where the bottom plate in the resonance cylinder corresponds to the third groove, and a smooth transition is made between both ends of the third groove and the inner wall of the bottom plate. A surface is installed, the length of the fourth groove is smaller than the length of the position where the bottom plate corresponds to the fourth groove in the resonance cylinder, and between both ends of the fourth groove and the inner wall of the bottom plate. The Japanese koto according to claim 2, wherein each of the koto has a smooth transition surface. The Japanese koto according to claim 3, wherein the horizontal sound board is arranged in the lateral direction in the resonance cylinder, and a string hole is provided in the center of the horizontal sound box. A first notch is installed on the connecting side of the soundboard and the surface plate and the side plate, and a first half-moon hole is provided between the first notch and the inner wall of the surface plate and the side plate in the assembled state. A second notch is provided on the connecting side of the soundboard and the bottom plate and the side plate, and a second half-moon hole is provided between the second notch and the inner wall of the bottom plate and the side plate in the assembled state. The Japanese koto according to claim 8, wherein the koto is formed. The Japanese koto according to claim 2, wherein the first groove, the second groove, the third groove, and the fourth groove are all arcuate grooves.

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