A type of double-sounding Japanese koto

Abstract

A double-sound-beam Japanese zither, comprising a resonance box, the box body of which is assembled by a panel, a bottom plate and side plates, and a resonance cavity is arranged inside the box body. It is characterized in that: two upper sound beams are fixedly arranged in parallel on the inner wall of the panel; two lower sound beams are fixedly arranged in parallel on the inner wall of the bottom plate; an upper "Feng" character-shaped groove is formed on the inner wall of the panel to form an upper "Feng" character-shaped sound tunnel; a lower "Feng" character-shaped groove is formed on the inner wall of the bottom plate to form a lower "Feng" character-shaped sound tunnel; a transverse sound beam is arranged horizontally in the resonance cavity, and the transverse sound beam is arranged at the positions of the left half and the right half of the groove body of the "Feng" character-shaped groove. This solution breaks the shackles of the traditional design of the internal structure of the resonance box of the previous Japanese zither, boldly proposes a new improved design solution, and solves the problems that the high-pitched area cannot be brightened, the low-pitched area is not thick and mellow enough, and the penetration of the sound is not strong enough when playing the previous Japanese zither.

Description

Technical Field

[0001] The invention relates to a plucked string instrument, in particular to a double-beam Japanese zither. Background Art

[0002] The Japanese koto is a plucked string instrument. In the early eighth century, the thirteen-stringed koto from the Tang Dynasty in China was introduced to Japan, and has evolved into traditional Japanese instruments such as the music koto, the tsukiko, and the sekoto. The three instruments have basically the same structure: 13 strings are stretched on the rectangular sound box made of paulownia wood, and each string is supported by a pillar. The names of the strings are called one, two, three, four, five, six, seven, eight, nine, ten, dou, wei, and jin from far to near, and the body of the instrument is straight. The Japanese koto is about 180 cm long and has thirteen strings. The strings are supported by thirteen movable pillars. The player can move the position of the pillars according to the needs to tune the instrument. When playing, the thumb, index finger, and middle finger are used to pluck the strings to play.

[0003] The earliest standard Japanese guzheng had 13 strings. The ones used today are basically 17-string guzhengs, and there are also 25-string guzhengs. Of course, the body of the guzheng is basically similar to that of the Chinese guzheng, with Paulownia wood as the main material of the body. Figure 1 -Attached Figure 7 The body of the Japanese koto is mainly composed of a panel 1, a bottom panel 2 and a side panel 3. A front cover 4 is provided at one end of the body, and a rear cover 5 is provided at the other end. The space enclosed by the panel 1, the bottom panel 2, the side panel 3, the front cover 4 and the rear cover 5 is a resonance chamber, and three sound beams 24 are horizontally provided in the resonance chamber.

[0004] The Japanese zither with 13 strings has a range of two octaves. The existing problems are: the timbre of the treble and bass areas is not good, specifically, the treble area is not bright, and the bass area is not thick and round enough. In addition, the penetration of the Japanese zither sound is not strong, which needs to be further improved. The main reason is that the resonance cavity of the Japanese zither cannot meet the requirements of good resonance and vibration from the treble area to the bass area, that is, it cannot adapt to the resonance and vibration of the wide frequency changes in the treble area, the middle area and the bass area at the same time. Further research shows that there are many factors that affect the resonance and vibration in the resonance cavity. In addition to the material and thickness of the panel and the bottom plate, the internal structure and construction of the resonance cavity have a greater impact. However, the resonance cavity of the existing Japanese zither is not conducive to the good sound wave resonance and vibration from the treble area to the bass area due to unreasonable design.

[0005] In view of this, how to improve the resonance box of the existing Japanese zither, especially to improve the internal structure and construction of the resonance cavity is the subject of the present invention. Summary of the invention

[0006] The invention provides a double-beam Japanese zither, and aims to solve the problem that the existing Japanese zither resonance cavity cannot take into account the high, middle and low frequency ranges and have good resonance timbre and penetration.

[0007] To achieve the above object, the technical solution adopted by the present invention is: a double-beam Japanese zither, comprising a resonance box, the box body of which is composed of a panel, a bottom plate and a side plate, a front sealing plate is arranged at one end of the box body, and a rear sealing plate is arranged at the other end, and the space enclosed by the panel, the bottom plate, the side plate, the front sealing plate and the rear sealing plate is a resonance cavity, and its innovation lies in:

[0008] Two upper sound beams are arranged in the resonance cavity. The upper sound beams are long sound beam components. One side of the two upper sound beams is tightly fixed on the inner wall of the panel, and the other side of the two upper sound beams is suspended in the resonance cavity relative to the bottom plate. The length direction of the two upper sound beams is consistent with the length direction of the resonance box. In the width direction of the resonance box, the two upper sound beams are parallel and separated by a distance.

[0009] A first groove is provided on the inner wall of the panel corresponding to the resonance cavity, and the first groove is opened along the width direction of the resonance box; a second groove is provided on the inner wall of the panel corresponding to the resonance cavity, and the second groove is opened along the length direction of the resonance box; the first groove and the second groove are cross-arranged on the inner wall of the panel and penetrate each other, wherein the second groove is located between the two upper sound beams, and the length direction of the second groove is consistent with the length direction of the upper sound beams; the first groove spans the two upper sound beams in the width direction of the resonance box and forms an upper transverse sound tunnel on the inner wall of the panel, and the second groove forms an upper longitudinal sound tunnel on the inner wall of the panel.

[0010] The relevant contents in the above technical solution are explained as follows:

[0011] 1. In the above scheme, the theme is "Japanese zither", and the innovation is concentrated on the "resonance box" of the Japanese zither, so other structures except the resonance box are not described. It can be considered that other structures of the Japanese zither of the present invention except the resonance box are realized by using the original Japanese zither technology.

[0012] 2. In the above scheme, the "resonance box" refers to the body of the zither composed of the top plate, the bottom plate and the side plates. The length direction of the resonance box of the Japanese koto refers to the direction roughly consistent with the strings, and the width direction of the resonance box is the direction perpendicular to the length direction. The "inner wall" for the resonance cavity refers to the inner wall surface, for example, the inner wall of the top plate refers to the wall surface on the inner side of the resonance cavity top plate, and the inner wall of the bottom plate refers to the wall surface on the inner side of the resonance cavity bottom plate.

[0013] 3. In the above scheme, two lower sound beams can be provided in the resonance chamber, and the lower sound beams are long strip-shaped sound beam components. One side of the two lower sound beams is tightly fixed on the inner wall of the bottom plate, and the other side of the two lower sound beams is suspended in the resonance chamber relative to the panel. The length direction of the two lower sound beams is consistent with the length direction of the resonance box. In the width direction of the resonance box, the two lower sound beams are parallel and separated by a distance.

[0014] A third groove is provided on the inner wall of the bottom plate corresponding to the resonance cavity, and the third groove is opened along the width direction of the resonance box; a fourth groove is provided on the inner wall of the bottom plate corresponding to the resonance cavity, and the fourth groove is opened along the length direction of the resonance box; the third groove and the fourth groove are cross-arranged on the inner wall of the bottom plate and penetrate each other, wherein the fourth groove is located between the two lower sound beams, and the length direction of the fourth groove is consistent with the length direction of the lower sound beams; the third groove spans the two lower sound beams in the width direction of the resonance box and forms a lower horizontal sound tunnel on the inner wall of the bottom plate, and the fourth groove forms a lower longitudinal sound tunnel on the inner wall of the bottom plate.

[0015] 4. In the above scheme, a transverse beam can be provided in the resonance chamber. The transverse beam is in the shape of a plate. The transverse beam is arranged at the position of the first groove and is symmetrical with respect to the central plane of the second groove. The top of the transverse beam is fixedly connected to the panel, the bottom of the transverse beam is fixedly connected to the bottom plate, and the side of the transverse beam is fixedly connected to the side plate on the corresponding side.

[0016] 5. In the above scheme, an upper bridge hole can be provided on the upper sound beam, the upper bridge hole is a hole on one side of the upper sound beam and forms an upper bridge type sound beam structure, and the upper bridge hole is mounted on the first groove. A lower bridge hole can also be provided on the lower sound beam, the lower bridge hole is a hole on one side of the lower sound beam and forms a lower bridge type sound beam structure, and the lower bridge hole is mounted on the third groove.

[0017] 6. In the above solution, an upper reinforcing plate may be fixedly mounted between the two upper sound beams, and a lower reinforcing plate may be fixedly mounted between the two lower sound beams.

[0018] 7. In the above scheme, the transverse sound beam is arranged in the horizontal direction of the resonance cavity, and a through hole is opened in the center of the transverse sound beam. A first notch is provided on the side where the transverse sound beam is connected to the panel and the side panel, and a first crescent hole is formed between the first notch and the inner wall of the panel and the side panel in the assembled state; a second notch is provided on the side where the transverse sound beam is connected to the bottom panel and the side panel, and a second crescent hole is formed between the second notch and the inner wall of the bottom panel and the side panel in the assembled state.

[0019] 8. In the above solution, it is best if the first groove, the second groove, the third groove and the fourth groove are all arc-shaped grooves.

[0020] The design principle and concept of the present invention are: for the Japanese zither, there are many factors that affect its timbre and penetration, such as the material, thickness, internal structure, etc. of the resonance box. In order to solve the problem that the existing Japanese zither resonance chamber cannot take into account the high, medium and low frequency ranges while having good resonance timbre and penetration, the present invention is mainly improved from the perspective of the resonance box, especially the internal structure of the resonance chamber. It is specifically embodied in the following aspects: first, two upper sound beams are fixed and arranged in parallel on the inner wall of the panel in the resonance chamber; second, grooves (i.e., the first groove and the second groove) are opened on the inner wall of the panel in the resonance chamber, and the grooves form an upper horizontal sound tunnel and an upper vertical sound tunnel on the inner wall of the panel. The present invention aims at the problem that the high pitch of the existing Japanese zither is not bright, the bass is not thick and round enough, and the sound penetration is not strong. The resonance box of the Japanese zither, especially the resonance cavity structure and the sound generation mechanism, are deeply discussed and studied, and it is found that the main reason for the poor timbre and volume of the high and low pitch of the existing Japanese zither and the lack of penetration is due to the unreasonable design of the resonance box, especially the resonance cavity, which causes the sound waves to not produce good resonance and vibration in the resonance cavity during performance. Accordingly, the inventor broke the constraints of the traditional resonance box (especially the resonance cavity) design of the Japanese zither in the past, and boldly proposed the improved design scheme of the present invention, which solved the problem that the high pitch of the Japanese zither is not bright, the bass is not thick and round enough, and the sound penetration is not strong from the perspective of vibration, resonance, and sound generation. Practice has proved that the improved design scheme has outstanding substantial characteristics and significant technical progress, and has achieved obvious technical effects.

[0021] Due to the application of the above technical solution, the present invention has the following advantages and effects compared with the existing Japanese zither resonance box (described in detail with the content of the best implementation mode, i.e., the embodiment of the present invention):

[0022] 1. The present invention is provided with a double sound beam structure in the center of both the panel and the bottom plate (i.e., two upper sound beams are arranged in parallel on the inner wall of the panel, and two lower sound beams are arranged in parallel on the inner wall of the bottom plate). Since the bass has a larger amplitude and lower frequency than the treble, the bass resonance is concentrated in the central area of ​​the resonance box, and the treble resonance is concentrated in the surrounding edge areas of the resonance box, which strengthens the strength of the central area of ​​the panel and the bottom plate, and plays an important role in improving the timbre and penetration of the bass area. On the other hand, strengthening the strength of the central area of ​​the panel and the bottom plate relatively changes the thickness difference between the central area and the surrounding edge areas of the resonance box, which also has a good effect on improving the timbre and penetration of the treble area.

[0023] 2. The present invention has opened a "丰" - shaped groove (i.e., the first groove and the second groove) on the inner wall of the panel, and this "丰" - shaped groove actually forms a "丰" - shaped sound tunnel on the inner wall of the panel. At the same time, a "丰" - shaped groove (i.e., the third groove and the fourth groove) is opened on the inner wall of the bottom plate, and this "丰" - shaped groove actually forms a "丰" - shaped sound tunnel on the inner wall of the bottom plate. Since the amplitude of bass is larger and the frequency is lower than that of treble, the bass resonance is concentrated in the central area of the resonance box, and the treble resonance is concentrated in the peripheral edge area of the resonance box. The vibration of the strings is collected from the central area where the sound tunnels cross and is quickly transmitted to the surrounding of the resonance cavity through the upper and lower "丰" - shaped sound tunnels (i.e., the tunnels of sound), which plays a key role in improving the timbre and penetration of the treble area, and also plays a good role in improving the timbre and penetration of the bass area.

[0024] 3. The present invention designs the sound beam into a bridge - type sound beam structure. In particular, there is a hole defect on one side of the sound beam, making the sound beam like a bridge arch structure. When such a sound beam is erected on the sound tunnel, it is more conducive to transmitting vibration through the sound tunnel and is also more conducive to the resonance of the resonance box.

[0025] 4. The present invention adopts a design of three horizontally arranged transverse sound beams. In the top - view state of the resonance box, these transverse sound beams and the two upper sound beams divide the corresponding space on the inner wall of the panel into eight resonance areas. At the same time, these transverse sound beams and the two lower sound beams divide the corresponding space on the inner wall of the bottom plate into eight resonance areas, totaling sixteen resonance areas. When playing the Japanese zither, the vibration of the strings is first transmitted to the central area where the sound tunnels cross, and then transmitted to these sixteen resonance areas through the sound tunnels, generating resonance and vibration, thereby amplifying the string sound into the resonance sound of the resonance box. Before the improvement, when playing the Japanese zither, only six sound wave quantities could be generated, that is, the three sound beams divide the resonance cavity into four resonance areas, each resonance area generates one sound wave quantity, plus one string wave quantity, and plus one strike wave quantity, totaling six sound wave quantities. After the improvement, when playing the Japanese zither of the present invention, eighteen sound wave quantities can be generated. Among them, sixteen resonance areas generate sixteen sound wave quantities, plus one string wave quantity, and plus one strike wave quantity, totaling eighteen sound wave quantities. The sound wave quantity is the number of sound waves. For a plucked instrument with a specific resonance box, except for one string wave quantity and one strike wave quantity, it mainly depends on the number of resonance areas in the resonance box. Usually, when the instrument is playing, each resonance area generates one sound wave quantity, and the number of sound wave quantities generated is equal to the number of resonance areas. In addition, the sound wave quantity directly affects the timbre, penetration, and volume of the instrument. Therefore, the design of the present invention can significantly improve the timbre of the treble area and the bass area and increase the penetration of the treble area and the bass area.

[0026] 5. The through - holes on the transverse sound beams of the present invention and the crescent holes between the transverse sound beams and the panel and the bottom plate are the channels between the various resonance areas in the resonance cavity. This channel design is conducive to the mutual transmission of sound waves, resonance, and vibration.

[0027] 6. The present invention fixes an upper reinforcing plate between two upper sound beams and a lower reinforcing plate between two lower sound beams, which can increase the strength of the middle area of ​​the panel and the bottom plate, especially between the upper sound beams and between the lower sound beams, and increase the load when the two upper sound beams and the two lower sound beams resonate, further improving the timbre and volume of the bass area. On the other hand, the central area of ​​the resonance box is strengthened, and the strength gap with the peripheral areas of the resonance box is relatively widened, which is also conducive to improving the timbre and penetration of the treble area.

[0028] 7. The first groove, the second groove, the third groove and the fourth groove of the present invention are all arc-shaped grooves, which can minimize the thickness changes of the panel and the bottom plate, thereby affecting the resonance and vibration of the resonance box.

[0029] The above advantages and effects are all described in the best way. However, it should be particularly emphasized that for the present invention, the measures of setting a double-beam structure and opening a groove on the inner wall of the panel are more important than adopting equivalent measures on the inner wall of the bottom plate, and the effect and effect are relatively better. The reason is that the panel is provided with strings, while the bottom plate is not directly connected to the strings. Therefore, setting a double-beam structure and opening a groove on the inner wall of the panel are the key to solving the technical problem of the present invention, and setting a double-beam structure and opening a groove on the inner wall of the bottom plate are icing on the cake for the present invention, which is easy to understand for those skilled in the art. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Attached Figure 1 This is the main view of the existing Japanese koto resonance box;

[0031] Attached Figure 2 This is a schematic diagram of the inner wall structure of the existing Japanese koto resonance box panel;

[0032] Attached Figure 3 This is a schematic diagram of the inner wall structure of the bottom plate of the existing Japanese zither resonance box;

[0033] Attached Figure 4 It is a cross-sectional view of a conventional Japanese koto resonance box;

[0034] Attached Figure 5 for Figure 4 Resonance box view in ;

[0035] Attached Figure 6 for Figure 4 A view of the resonance box bracing in Figure 2;

[0036] Attached Figure 7 for Figure 6 Left view of;

[0037] Attached Figure 8 This is a schematic diagram of the main structure of a Japanese zither resonance box according to an embodiment of the present invention;

[0038] Attached Fig. 9 This is a front view of the inner wall of the panel of the Japanese zither resonance box according to an embodiment of the present invention;

[0039] Attached Fig.10 This is a front view of the inner wall of the bottom plate of the Japanese zither resonance box according to an embodiment of the present invention;

[0040] Attached Fig.11 It is a cross-sectional view of a resonance box of a Japanese zither according to an embodiment of the present invention;

[0041] Attached Fig.12 for Fig.11 A cross-sectional view of the resonance box in FIG.

[0042] Attached Fig.13 It is a front view of the transverse sound beam of a Japanese zither according to an embodiment of the present invention;

[0043] Attached Fig.14 It is a left side view of the horizontal sound beam of the Japanese zither according to an embodiment of the present invention;

[0044] Attached Fig.15 A front view of an upper sound beam of a Japanese zither according to an embodiment of the present invention;

[0045] Attached Fig.16 It is a left view of the upper sound beam of the Japanese zither according to an embodiment of the present invention;

[0046] Attached Fig.17 A front view of a lower sound beam of a Japanese zither according to an embodiment of the present invention;

[0047] Attached Fig.18 It is a left side view of the lower sound beam of the Japanese zither according to an embodiment of the present invention.

[0048] In the above figures: 1. panel; 2. bottom plate; 3. side plate; 4. front cover plate; 5. rear cover plate; 6. upper sound beam; 7. lower sound beam; 8. first groove; 9. second groove; 10. third groove; 11. fourth groove; 12. upper bridge hole; 13. lower bridge hole; 16. transverse sound beam; 17. upper reinforcement plate; 18. lower reinforcement plate; 19. first round notch; 20. first crescent hole; 21. second round notch; 22. second crescent hole; 23. through hole; 24. sound beam. DETAILED DESCRIPTION

[0049] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0050] Embodiment: A double-beam Japanese zither

[0051] Since the innovations of the present invention are all concentrated on the resonance box, this embodiment will focus on describing the structure and construction of the Japanese koto resonance box, while other structures can be considered to be implemented using existing technologies and will not be described in detail in this embodiment.

[0052] The structure and construction of the Japanese zither resonance box of this embodiment are as follows: Figure 8-18 As shown, the body of the resonance box is composed of a panel 1, a bottom panel 2 and a side panel 3 (see Fig.12 ), a front sealing plate 4 is arranged at one end of the box body, and a rear sealing plate 5 is arranged at the other end (see Figure 8 ), the space enclosed by the panel 1, the bottom panel 2, the side panels 3, the front cover 4 and the rear cover 5 is a resonance chamber (see Figure 8 ).

[0053] Two upper sound beams 6 and two lower sound beams 7 are arranged in the resonance cavity (see Fig.11 ), the upper sound beam 6 and the lower sound beam 7 are both long strip sound beam components (see Figure 15-18 The upper sound beam 6 is provided with an upper bridge hole 12, and the upper bridge hole 12 is a hole on one side of the upper sound beam 6 so that the upper sound beam 6 forms an upper bridge type sound beam structure (see Fig.15 ), the upper bridge hole 12 is erected on the first groove 8 (see Fig. 9 The lower sound beam 7 is provided with a lower bridge hole 13, and the lower bridge hole 13 is a hole on one side of the lower sound beam 7 so that the lower sound beam 7 forms a lower bridge type sound beam structure (see Fig.17 ), the lower bridge hole 13 is erected on the third groove 10 (see Fig.10 One side of the two upper sound beams 6 is fixed closely to the inner wall of the panel 1 (see Fig.11 ), the other side of the two upper sound beams 6 is suspended in the resonance chamber relative to the bottom plate 2, the length direction of the two upper sound beams 6 is consistent with the length direction of the resonance box, and the two upper sound beams 6 are parallel and separated by a distance in the width direction of the resonance box (see Fig. 9 One side of the two lower sound beams 7 is fixed closely to the inner wall of the bottom plate 2 (see Fig.11 ), the other side of the two lower sound beams 7 is suspended in the resonance cavity relative to the panel 1, the length direction of the two lower sound beams 7 is consistent with the length direction of the resonance box, and the two lower sound beams 7 are parallel and separated by a distance in the width direction of the resonance box (see Fig.10 ).

[0054] Three first grooves 8 are provided on the inner wall of the panel 1 corresponding to the resonance cavity (see Fig. 9 ), the three first grooves 8 are all opened along the width direction of the resonance box, and the three first grooves 8 are arranged at intervals in the length direction of the resonance box. At the same time, a second groove 9 is provided on the inner wall of the panel 1 corresponding to the resonance cavity (see Fig. 9), the second groove 9 is formed along the length direction of the resonance box, and the second groove 9 is located at the central position in the width direction of the resonance box. The three first grooves 8 and one second groove 9 form a "丰" shaped groove on the inner wall of the panel 1 and communicate with each other. Among them, the second groove 9 is located between the two upper sound beams 6, and the length direction of the second groove 9 is the same as the length direction of the upper sound beam 6; the three first grooves 8 span the two upper sound beams 6 in the width direction of the resonance box and form three upper transverse sound tunnels on the inner wall of the panel 1, and the second groove 9 forms an upper longitudinal sound tunnel on the inner wall of the panel 1 (see Fig. 9 ).

[0055] The length of the first groove 8 is less than the length of the panel 1 in the resonance cavity at the corresponding position of the first groove 8 (see Fig. 9 ), and smooth transition surfaces are provided between both ends of the first groove 8 and the inner wall of the panel 1. The length of the second groove 9 is less than the length of the panel 1 in the resonance cavity at the corresponding position of the second groove 9, and smooth transition surfaces are provided between both ends of the second groove 9 and the inner wall of the panel 1 (see Fig. 9 ).

[0056] On the inner wall of the bottom plate 2 corresponding to the resonance cavity, three third grooves 10 are provided (see Fig.10 ), the three third grooves 10 are all formed along the width direction of the resonance box, and the three third grooves 10 are arranged at intervals in the length direction of the resonance box. At the same time, on the inner wall of the bottom plate 2 corresponding to the resonance cavity, a fourth groove 11 is provided (see Fig.10 ), the fourth groove 11 is formed along the length direction of the resonance box, and the fourth groove 11 is located at the central position in the width direction of the resonance box. The three third grooves 10 and one fourth groove 11 form a "丰" shaped groove on the inner wall of the bottom plate 2 and communicate with each other (see Fig.10 ), among which, the fourth groove 11 is located between the two lower sound beams 7, and the length direction of the fourth groove 11 is the same as the length direction of the lower sound beam 7; the three third grooves 10 span the two lower sound beams 7 in the width direction of the resonance box and form three lower transverse sound tunnels on the inner wall of the bottom plate 2, and the fourth groove 11 forms a lower longitudinal sound tunnel on the inner wall of the bottom plate 2 (see Fig.10 ).

[0057] The length of the third groove 10 is less than the length of the bottom plate 2 in the resonance cavity at the corresponding position of the third groove 10 (see Fig.10 ), and smooth transition surfaces are provided between both ends of the third groove 10 and the inner wall of the bottom plate 2. The length of the fourth groove 11 is less than the length of the bottom plate 2 in the resonance cavity at the corresponding position of the fourth groove 11 (see Fig.10 ), and smooth transition surfaces are provided between both ends of the fourth groove 11 and the inner wall of the bottom plate 2.

[0058] The "丰"-shaped grooves on the inner wall of the panel 1 correspond to the "丰"-shaped grooves on the inner wall of the bottom plate 2 in the height direction of the resonance box. At six positions, namely, the left half of the three horizontal parts and the right half of the three horizontal parts in the "丰"-shaped grooves, a horizontal sound beam 16 is respectively provided (see Fig. 9 ). These six horizontal sound beams 16 are all plate-shaped (see Fig.13 and Fig.14 ). Among them, the top of each horizontal sound beam 16 is fixedly connected to the corresponding part of the panel 1, the bottom of each horizontal sound beam 16 is fixedly connected to the corresponding part of the bottom plate 2, and the side part of each horizontal sound beam 16 is fixedly connected to the corresponding part of the side plate 3 (see Fig.11 ). The horizontal sound beams 16 are arranged horizontally in the resonance cavity, and a through hole 23 is provided in the center of the horizontal sound beam 16 (see Fig.13 ). A first circular cutout 19 is provided on the connecting side edge of the horizontal sound beam 16 and the panel 1 and the side plate 3 (see Fig.13 ). In the assembled state, a first crescent hole 20 is formed between the first circular cutout 19 and the inner walls of the panel 1 and the side plate 3 (see Fig.11 ). A second circular cutout 21 is provided on the connecting side edge of the horizontal sound beam 16 and the bottom plate 2 and the side plate 3 (see Fig.13 ). In the assembled state, a second crescent hole 22 is formed between the second circular cutout 21 and the inner walls of the bottom plate 2 and the side plate 3 (see Fig.11 ).

[0059] A upper reinforcing plate 17 is fixedly installed between the two upper sound beams 6 (see Fig. 9 and Fig.11 ). A lower reinforcing plate 18 is fixedly installed between the two lower sound beams 7 (see Fig.10 and Fig.11 ). The first groove 8, the second groove 9, the third groove 10 and the fourth groove 11 are all arc-shaped grooves.

[0060] The following is an explanation of other implementation cases and structural changes of the present invention:

[0061] 1. In the above embodiments, when viewed in the width direction of the resonance box, the two upper sound beams 6 are arranged in parallel (see Fig. 9 ). The two lower sound beams 7 are arranged in parallel (see Fig.10 ). However, the present invention is not limited thereto. The two upper sound beams 6 do not necessarily have to be parallel, and the two lower sound beams 7 do not necessarily have to be parallel either. However, the parallel arrangement is the best, which is easily understood and accepted by those skilled in the art.

[0062] 2. In the above embodiments, both the panel 1 and the bottom plate 2 are provided with double-tone beam structures and grooves. However, the present invention is not limited thereto. The double-tone beams and grooves on the inner wall of the bottom plate 2 can be eliminated or changed to other structural forms. It is also feasible to only retain the technical measures provided on the inner wall of the panel 1, but the effect is slightly worse. For the resonance box of the Japanese koto, the panel 1 is more important than the bottom plate 2. The reason is that the panel 1 is provided with strings, while the bottom plate 2 is not directly related to the strings, which is easy to understand for those skilled in the art.

[0063] 3. In the above embodiments, a double beam structure is provided on the inner wall of the panel 1 and the bottom plate 2. That is, two upper beams 6 are provided on the panel 1, and two lower beams 7 are provided on the bottom plate 2. However, the present invention is not limited thereto, and the two upper beams 6 can be changed in form to four upper beams 6 used in parallel. For the present invention, although the four upper beams 6 and the two upper beams 6 are different in number and form, they are essentially the same. Assuming that the two outer beams of the four upper beams 6 are close to the two inner beams, it can be equivalent to a double beam. Therefore, it can be considered that this change does not bring unexpected effects and should be understood as being substantially equivalent. Similarly, the double beam structure on the bottom plate 2 should also include such a change. In the present invention, the double beam includes the meaning of symmetrical arrangement of even-numbered beams, so the symmetrical arrangement of six beams is also an equivalent variation of the present invention. This is easy to understand for those skilled in the art.

[0064] 4. In the above embodiment, three first grooves 8 are provided on the inner wall of the panel 1 (see Fig. 9 ), three third grooves 10 are provided on the inner wall of the bottom plate 2 (see Fig.10 ). However, the present invention is not limited thereto, and the number of the first groove 8 and the third groove 10 can be one, two, four or five, etc. Such changes can be determined according to actual conditions. In essence, the number of the first groove 8 and the third groove 10 is at least one.

[0065] 5. In the above embodiment, six transverse beams 16 (see Fig. 9 ). Among them, the six transverse beams 16 are divided into three groups, and the two transverse beams 16 in each group are bilaterally symmetrical with respect to the center plane of the second groove 9 (see Fig. 9 ), but the present invention is not limited to this, each group of two transverse beams 16 can be combined into one transverse beam 16 by being connected to each other, which is easily understood and accepted by those skilled in the art.

[0066] 6. In the above embodiment, an upper bridge hole 12 is provided on the upper sound beam 6, and a lower bridge hole 13 is provided on the lower sound beam 7. However, the present invention is not limited thereto, and the upper bridge hole 12 and the lower bridge hole 13 may not be provided, or even only one of the upper sound beam 6 and the lower sound beam 7 may be provided with a bridge hole. This is easily understood and accepted by those skilled in the art.

[0067] 7. In the above embodiment, an upper reinforcing plate 17 is fixedly mounted between the two upper sound beams 6 (see Fig.11 ), a lower reinforcement plate 18 is fixedly mounted between the two lower sound beams 7 (see Fig.11 ). However, the present invention is not limited thereto, and the upper reinforcing plate 17 may not be provided, and the two upper sound beams 6 may be suspended in the resonance box. Similarly, the lower reinforcing plate 18 may not be provided, and the two lower sound beams 7 may be suspended in the resonance box. The upper reinforcing plate 17 and the lower reinforcing plate 18 may increase the strength of the middle area of ​​the panel and the bottom plate, especially between the upper sound beams and between the lower sound beams, and may increase the load when the two upper sound beams and the two lower sound beams resonate.

[0068] 8. In the above embodiments, the first groove 8, the second groove 9, the third groove 10 and the fourth groove 11 are all arc-shaped grooves. However, the present invention is not limited thereto, and the grooves can be designed into other shapes, such as V-shaped, U-shaped, W-shaped and other concave structures. This is easily understood and accepted by those skilled in the art.

[0069] 9. In the above embodiment, from the cross section of the resonance box, the two lower sound beams 7 and the two upper sound beams 6 are arranged in a corresponding position in the vertical direction (see Fig.11 ). However, the present invention is not limited thereto, and the arrangement may not be aligned, but the alignment arrangement has the best effect. This is easily understood and accepted by those skilled in the art.

[0070] 10. In the above embodiment, the two upper sound beams 6 have the same shape and size (see Fig.15 The two lower sound beams 7 have the same shape and size (see Fig.17 ). However, the present invention is not limited thereto, and the shapes and sizes of the two upper sound beams 6 may be different, and the shapes and sizes of the two lower sound beams 7 may also be different. Specifically, it can be determined when the resonance box is debugging the timbre and sound quality. This is easily understood and accepted by those skilled in the art.

[0071] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A double-beam Japanese zither, comprising a resonance box, wherein the box body of the resonance box is composed of a panel (1), a bottom plate (2) and a side plate (3), a front sealing plate (4) is arranged at one end of the box body, and a rear sealing plate (5) is arranged at the other end, and the space enclosed by the panel (1), the bottom plate (2), the side plate (3), the front sealing plate (4) and the rear sealing plate (5) is a resonance chamber, characterized in that: Two upper sound beams (6) are arranged in the resonance chamber, the upper sound beams (6) being long strip-shaped sound beam components, one side of the two upper sound beams (6) being closely fixed to the inner wall of the panel (1), the other side of the two upper sound beams (6) being suspended in the resonance chamber relative to the bottom plate (2), the length direction of the two upper sound beams (6) being consistent with the length direction of the resonance box, and the two upper sound beams (6) being arranged side by side and spaced a certain distance apart in the width direction of the resonance box; A first groove (8) is provided on the inner wall of the panel (1) corresponding to the resonance cavity, and the first groove (8) is opened along the width direction of the resonance box; a second groove (9) is provided on the inner wall of the panel (1) corresponding to the resonance cavity, and the second groove (9) is opened along the length direction of the resonance box; the first groove (8) and the second groove (9) are cross-arranged on the inner wall of the panel (1) and are mutually connected, wherein the second groove (9) is located between the two upper sound beams (6), and the length direction of the second groove (9) is consistent with the length direction of the upper sound beam (6); the first groove (8) spans the two upper sound beams (6) in the width direction of the resonance box and forms an upper transverse sound tunnel on the inner wall of the panel (1), and the second groove (9) forms an upper longitudinal sound tunnel on the inner wall of the panel (1); Two lower sound beams (7) are arranged in the resonance chamber, the lower sound beams (7) being long strip-shaped sound beam components, one side of the two lower sound beams (7) being closely fixed to the inner wall of the bottom plate (2), the other side of the two lower sound beams (7) being suspended in the resonance chamber relative to the panel (1), the length direction of the two lower sound beams (7) being consistent with the length direction of the resonance box, and the two lower sound beams (7) being arranged side by side and spaced a certain distance apart in the width direction of the resonance box; A third groove (10) is provided on the inner wall of the bottom plate (2) corresponding to the resonance cavity, and the third groove (10) is opened along the width direction of the resonance box; a fourth groove (11) is provided on the inner wall of the bottom plate (2) corresponding to the resonance cavity, and the fourth groove (11) is opened along the length direction of the resonance box; the third groove (10) and the fourth groove (11) are cross-arranged on the inner wall of the bottom plate (2) and are interconnected, wherein the fourth groove (11) is located between the two lower sound beams (7), and the length direction of the fourth groove (11) is consistent with the length direction of the lower sound beam (7); the third groove (10) spans the two lower sound beams (7) in the width direction of the resonance box and forms a lower transverse sound tunnel on the inner wall of the bottom plate (2), and the fourth groove (11) forms a lower longitudinal sound tunnel on the inner wall of the bottom plate (2).

2. The Japanese zither according to claim 1, characterized in that: A transverse sound beam (16) is provided in the resonance chamber. The transverse sound beam (16) is in the shape of a plate. The transverse sound beam (16) is arranged at the position of the first groove (8) and is bilaterally symmetrical with respect to the central plane of the second groove (9). The top of the transverse sound beam (16) is fixedly connected to the panel (1), the bottom of the transverse sound beam (16) is fixedly connected to the bottom plate (2), and the side of the transverse sound beam (16) is fixedly connected to the side plate (3) on the corresponding side.

3. The Japanese zither according to claim 1, characterized in that: An upper bridge hole (12) is provided on the upper sound beam (6), the upper bridge hole (12) is a hole on one side of the upper sound beam (6) and enables the upper sound beam (6) to form an upper bridge type sound beam structure, and the upper bridge hole (12) is mounted on the first groove (8); The lower sound beam (7) is provided with a lower bridge hole (13), the lower bridge hole (13) is a hole on one side of the lower sound beam (7) so that the lower sound beam (7) forms a lower bridge type sound beam structure, and the lower bridge hole (13) is mounted on the third groove (10).

4. The Japanese zither according to claim 1, characterized in that: An upper reinforcing plate (17) is fixedly mounted between the two upper sound beams (6), and a lower reinforcing plate (18) is fixedly mounted between the two lower sound beams (7).

5. The Japanese zither according to claim 1, characterized in that: The length of the first groove (8) is smaller than the length of the panel (1) in the resonance cavity at a position corresponding to the first groove (8), and smooth transition surfaces are provided between both ends of the first groove (8) and the inner wall of the panel (1); the length of the second groove (9) is smaller than the length of the panel (1) in the resonance cavity at a position corresponding to the second groove (9), and smooth transition surfaces are provided between both ends of the second groove (9) and the inner wall of the panel (1).

6. The Japanese zither according to claim 1, characterized in that: The length of the third groove (10) is smaller than the length of the bottom plate (2) in the resonance chamber at a position corresponding to the third groove (10), and smooth transition surfaces are provided between both ends of the third groove (10) and the inner wall of the bottom plate (2); the length of the fourth groove (11) is smaller than the length of the bottom plate (2) in the resonance chamber at a position corresponding to the fourth groove (11), and smooth transition surfaces are provided between both ends of the fourth groove (11) and the inner wall of the bottom plate (2).

7. The Japanese zither according to claim 2, characterized in that: The transverse sound beam (16) is arranged in a lateral direction in the resonance cavity, and a through hole (23) is provided in the center of the transverse sound beam (16).

8. The Japanese zither according to claim 7, characterized in that: A first notch (19) is provided on the side where the transverse tone beam (16) is connected to the panel (1) and the side panel (3); in the assembled state, a first crescent hole (20) is formed between the first notch (19) and the inner wall of the panel (1) and the side panel (3); a second notch (21) is provided on the side where the transverse tone beam (16) is connected to the bottom panel (2) and the side panel (3); in the assembled state, a second crescent hole (22) is formed between the second notch (21) and the inner wall of the bottom panel (2) and the side panel (3).

9. The Japanese zither according to claim 1, characterized in that: The first groove (8), the second groove (9), the third groove (10) and the fourth groove (11) are all arc-shaped grooves.

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