A two-tone Liangse

Abstract

A double-tone beam se, comprising a resonance box, the box body of the resonance box being assembled by a panel, a bottom plate and side plates, characterized in that: two upper tone beams are fixedly arranged in parallel on the inner wall of the panel; two lower tone 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; there are three transverse tone beams in the resonance box, and the three transverse tone beams are correspondingly arranged at the positions of the three horizontal grooves 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 se in the past, boldly proposes a new improved design solution, and solves the problem that the high pitch area is thin and the low pitch area is hollow when playing the se in the past.

Description

Technical Field

[0001] The invention relates to a traditional Chinese plucked string instrument, in particular to a two-tone beam harp, which refers to a harp series including a small harp, a middle harp, a large harp and the like. Background Art

[0002] Se is an ancient stringed instrument of the Han nationality, belonging to the court music. Se can be divided into Dase, Zhongse and Xiaose. Se has at least 25 strings and at most 50 strings. In terms of pitch, Xiaose is a high-pitched Se with 25 strings and a range of two octaves; Zhongse is a medium-pitched Se with 32 strings and a range of two and a half octaves; Dase is a low-pitched Se with 37 strings and a range of three octaves. Regardless of Dase, Zhongse and Xiaose, their structures and constructions are generally the same, that is, the Se body is mostly made of whole wood, the Se surface is slightly raised, the body is hollow, and the bottom plate is embedded under the body to form a resonance box. There is a long Yueshan at the head end of the Se face and three short Yueshan at the tail end. There are four pegs for stringing at the tail end. There are corresponding string holes on the outside of the first and last Yueshan. There is also a wooden Se column under the strings.

[0003] At present, the common problems of the harp are: the timbre, penetration and volume in the high and low ranges are not good, and the timbre, penetration and volume effects of the harp are not fully exerted. The specific manifestation is that the sound of the harp is slightly empty in the low range and slightly thin in the high range. The main reason is that the current harp resonance box cannot meet the requirements of good resonance and vibration from the high and low ranges, that is, it cannot adapt to the resonance and vibration of the wide frequency changes in the high, middle and low ranges at the same time. Further research shows that there are many factors that affect the resonance and vibration in the resonance box. In addition to the material and thickness of the panel and bottom plate, the internal structure and construction of the resonance box have a greater impact. However, the existing harp resonance box design is unreasonable, which is not conducive to the resonance box to exert good sound wave resonance and vibration from the high to low range.

[0004] In view of this, how to improve the resonance box of the existing qin, especially how to improve the internal structure and construction of the resonance box is the subject of the present invention. Summary of the invention

[0005] The invention provides a double-tone beam harp, and aims to solve the problem that the existing harp resonance box cannot take into account the high, middle and low frequency ranges and have good resonance timbre, penetration and volume.

[0006] To achieve the above object, the technical solution adopted by the present invention is: a two-tone liangqin, including a resonance box, the box body of which is composed of a panel, a bottom plate and a side plate, a nail 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 nail plate and the rear sealing plate is a resonance chamber, and its innovation lies in:

[0007] There are two upper sound beams provided in the resonance cavity. The upper sound beams are strip-shaped sound beam components. One side of the two upper sound beams is closely fixed to 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 directions of the two upper sound beams are the same as the length direction of the resonance box. When viewed in the width direction of the resonance box, the two upper sound beams are arranged side by side and separated by a certain distance.

[0008] A first groove is provided on the inner wall of the panel corresponding to the resonance cavity. 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. The second groove is opened along the length direction of the resonance box. The first groove and the second groove are cross-arranged and communicate with each other on the inner wall of the panel. Among them, the second groove is located at the position between the two upper sound beams, and the length direction of the second groove is the same as the length direction of the upper sound beam. The first groove spans across 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. The second groove forms an upper longitudinal sound tunnel on the inner wall of the panel.

[0009] The explanations of the relevant contents in the above technical solutions are as follows:

[0010] 1. In the above solution, the theme is the "se", and the innovation points are concentrated on the "resonance box" of the se. Therefore, the components and structures other than the resonance box are not described. It can be considered that the other structures in the se of the present invention are implemented by using the existing technology.

[0011] 2. In the above solution, the "resonance box" refers to the body of the qin formed by splicing the panel, the bottom plate and the side plates. The length direction of the resonance box of the se is the direction approximately consistent with the strings, and the width direction of the resonance box is the direction perpendicular to the length direction. The "inner wall" of the resonance box refers to the inner wall surface. For example, the inner wall of the panel refers to the inner wall surface of the panel close to the resonance box, and the inner wall of the bottom plate refers to the inner wall surface of the bottom plate close to the resonance box.

[0012] 3. In the above solution, two lower sound beams can be provided in the resonance cavity. The lower sound beams are strip-shaped sound beam components. One side of the two lower sound beams is closely fixed to the inner wall of the bottom plate, and the other side of the two lower sound beams is suspended in the resonance cavity relative to the panel. The length directions of the two lower sound beams are the same as the length direction of the resonance box. When viewed in the width direction of the resonance box, the two lower sound beams are arranged side by side and separated by a certain distance.

[0013] 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.

[0014] 4. In the above scheme, a transverse sound beam can be provided in the resonance chamber, and the transverse sound beam is arranged at the position of the first groove. The transverse sound beam is generally arc-shaped, wherein the top of the arc is located in the first groove and is fixedly connected to the inner wall of the panel, and the two sides of the arc are correspondingly fixed on the side panels.

[0015] 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.

[0016] 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.

[0017] 7. In the above scheme, the transverse tone beam is provided with an avoidance notch at the position corresponding to the upper tone beam. In the assembled state, the upper tone beam is located in the avoidance notch, and the avoidance notch cooperates with the inner wall of the panel to form an avoidance hole. The transverse tone beam is provided with two oblong through holes, and the two through holes are symmetrical with respect to the arc symmetry line of the transverse tone beam. The side edge of the transverse tone beam connected to the panel and the side panel is provided with a circular notch, and a crescent hole is formed between the circular notch and the inner wall of the panel and the side panel in the assembled state. The arc bottom of the transverse tone beam is suspended relative to the bottom plate.

[0018] 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.

[0019] The design principle and concept of the present invention are: for the harp, there are many factors that affect its timbre, penetration and volume, such as the material, thickness, internal structure of the resonance box, etc. In order to solve the problem that the existing harp resonance box cannot take into account the high, medium and low frequency ranges and have good resonance timbre, penetration and volume at the same time, 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 longitudinal sound tunnel on the inner wall of the panel. Aiming at the problem that the high pitch area of ​​the existing harp is thin and the low pitch area is empty, the present invention conducts in-depth discussion and research on the resonance box of the harp, especially the structure of the resonance chamber and the sound generation mechanism, and finds out that the main reason for the poor timbre, penetration and volume of the high and low pitch areas of the existing harp is due to the unreasonable design of the resonance box, especially the resonance chamber, which causes the sound waves to fail to produce good resonance and vibration in the resonance chamber during performance. Based on this, the inventor broke the constraints of the traditional resonance box (especially the resonance chamber) design of the serpent and boldly proposed the improved design scheme of the present invention. From the perspectives of vibration, resonance and sound generation, the inventor solved the problem of the thin high-pitched area and the empty low-pitched area of ​​the serpent. Practice has proved that the improved design scheme has outstanding substantive characteristics and remarkable technical progress, and has achieved obvious technical effects.

[0020] Due to the application of the above technical solution, the present invention has the following advantages and effects compared with the existing harp resonance box (described in detail with the best implementation mode, i.e., the content of the embodiment of the present invention):

[0021] 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, penetration and volume 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, penetration and volume of the treble area.

[0022] 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 the bass is larger and the frequency is lower than that of the 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 of the sound tunnel intersection and quickly transmitted to the surrounding of the resonance cavity through the upper and lower two "丰"-shaped sound tunnels (i.e., the tunnels of sound), which plays a key role in improving the timbre, penetration and volume in the treble area, and also plays a good role in improving the timbre, penetration and volume in the bass area.

[0023] 3. The present invention designs the sound beam into a bridge-shaped sound beam structure, especially with a hole defect designed 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 also more conducive to the resonance of the resonance box.

[0024] 4. The present invention adopts the design of three horizontal sound beams. In the top view state of the resonance box, the combination of these three horizontal sound beams and two upper sound beams divides the corresponding space on the inner wall of the panel into eight resonance areas. At the same time, the combination of the three horizontal sound beams and two lower sound beams divides the corresponding space on the inner wall of the bottom plate into eight resonance areas, totaling sixteen resonance areas. When the se is played, the vibration of the strings is first transmitted to the central area of the sound tunnel intersection, and then transmitted to these sixteen resonance areas through the sound tunnel, generating resonance and vibration, thereby amplifying the string sound into the resonance sound of the resonance box. Before the improvement, when the seqin was played, at most six sound wave quantities could be generated, that is, the resonance box was divided into at most four resonance areas, each resonance area generated one sound wave quantity, plus one string wave quantity, plus one excitation wave quantity, totaling six sound wave quantities. After the improvement, the se of the present invention can generate eighteen sound wave quantities when played. Among them, sixteen resonance areas generate sixteen sound wave quantities, plus one string wave quantity, plus one excitation 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 excitation wave quantity, it mainly depends on the number of resonance areas in the resonance box. Usually, when the instrument is played, 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 in the treble and bass areas, and increase the penetration and volume in the treble and bass areas.

[0025] 5. The through holes on the horizontal sound beams of the present invention and the crescent holes between the horizontal sound beams and the panel and the side plates 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.

[0026] 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, penetration 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, penetration and volume of the treble area.

[0027] 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.

[0028] 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

[0029] Attached Figure 1 This is a schematic diagram of the main structure of the resonance box of an embodiment of the present invention;

[0030] Attached Figure 2 This is a front view of the inner wall of the panel of the resonance box of the embodiment of the present invention;

[0031] Attached Figure 3 It is a front view of the inner wall of the bottom plate of the resonance box of the embodiment of the present invention;

[0032] Attached Figure 4 for Figure 1 AA section view;

[0033] Attached Figure 5 for Figure 4 A cross-sectional view of the resonance box in FIG.

[0034] Attached Figure 6 A front view of an upper sound beam of a harp according to an embodiment of the present invention;

[0035] Attached Figure 7 It is a left side view of the upper sound beam of the harp according to an embodiment of the present invention;

[0036] Attached Figure 8 It is a front view of the lower sound beam of the harp according to an embodiment of the present invention;

[0037] Attached Fig. 9 It is a left view of the lower sound beam of the harp according to an embodiment of the present invention.

[0038] Attached Fig.10 It is a front view of the transverse sound beam of the harp according to an embodiment of the present invention;

[0039] Attached Fig.11 It is a left side view of the transverse sound beam of the harp according to an embodiment of the present invention.

[0040] In the above figures: 1. panel; 2. bottom plate; 3. side plate; 4. nail 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. round notch; 20. crescent hole; 21. avoidance notch; 22. avoidance hole; 23. through hole. DETAILED DESCRIPTION

[0041] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0042] Embodiment: A two-tone harp

[0043] 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 serpent's resonance box, while other structures of the serpent can be considered to be implemented using existing technologies and will not be described in detail in this embodiment.

[0044] The structure and construction of the resonance box of this embodiment are as follows: Figure 1-11 As shown, the body of the resonance box is composed of a panel 1, a bottom panel 2 and a side panel 3 (see Figure 1 and Figure 4 ), a nail 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 1 ), the space enclosed by the panel 1, the bottom panel 2, the side panel 3, the nail plate 4 and the rear cover 5 is a resonance chamber (see Figure 1 ).

[0045] Two upper sound beams 6 and two lower sound beams 7 are arranged in the resonance cavity (see Figure 4 ), the upper sound beam 6 and the lower sound beam 7 are both long strip sound beam components (see Figure 6-Figure 9 The upper sound beam 6 is provided with an upper bridge hole 12 (see Figure 6 ), 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, 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 (see Figure 8), the lower bridge hole 13 has a hole defect on one side of the lower sound beam 7, causing the lower sound beam 7 to form a lower bridge type sound beam structure, and the lower bridge hole 13 is erected on the third groove 10. One side of the two upper sound beams 6 is closely fixed to the inner wall of the panel 1 (see Figure 2 ), the other side of the two upper sound beams 6 is suspended in the resonance cavity relative to the bottom plate 2, the length directions of the two upper sound beams 6 are consistent with the length direction of the resonance box, and when viewed in the width direction of the resonance box, the two upper sound beams 6 are arranged in parallel and separated by a certain distance. One side of the two lower sound beams 7 is closely fixed to the inner wall of the bottom plate 2 (see Figure 3 ), the other side of the two lower sound beams 7 is suspended in the resonance cavity relative to the panel 1, the length directions of the two lower sound beams 7 are consistent with the length direction of the resonance box, and when viewed in the width direction of the resonance box, the two lower sound beams 7 are arranged in parallel and separated by a certain distance.

[0046] On the inner wall of the panel 1 corresponding to the resonance cavity, three first grooves 8 are provided (see Figure 2 ), 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, on the inner wall of the panel 1 corresponding to the resonance cavity, a second groove 9 is provided (see Figure 2 ), the second groove 9 is opened 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 the second groove 9 form a "丰" - shaped groove on the inner wall of the panel 1 and communicate with each other (see Figure 2 ), among which, 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 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.

[0047] 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 Figure 2 ), 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 (see Figure 2 ), and smooth transition surfaces are provided between both ends of the second groove 9 and the inner wall of the panel 1.

[0048] On the inner wall of the bottom plate 2 corresponding to the resonance cavity, three third grooves 10 are provided (see Figure 3 ), the three third grooves 10 are all opened 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. On the inner wall of the bottom plate 2 corresponding to the resonance cavity, a fourth groove 11 is provided (see Figure 3), the fourth groove 11 is opened 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 "Feng" - shaped groove on the inner wall of the bottom plate 2 and communicate with each other (see Figure 3 ), wherein, 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 across 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.

[0049] 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 Figure 3 ), 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 Figure 3 ), and smooth transition surfaces are provided between both ends of the fourth groove 11 and the inner wall of the bottom plate 2.

[0050] Three transverse sound beams 16 are provided in the resonance cavity, and each transverse sound beam 16 is arranged at the position of a first groove 8 (see Figure 2 ), the transverse sound beam 16 is generally in an arc shape (see Fig.10 ), wherein, the top of the arc is located in the first groove 8 (see Figure 2 ), and is fixedly connected to the inner wall of the panel 1, and both sides of the arc are fixedly connected to the side plate 3 correspondingly (see Figure 4 ). The transverse sound beam 16 is provided with an avoidance notch 21 at the position corresponding to the upper sound beam 6 (see Fig.10 ), in the assembled state, the upper sound beam 6 is located in the avoidance notch 21, and the avoidance notch 21 and the inner wall of the panel 1 cooperate to form an avoidance hole 22 (see Figure 4 ). Two oblong through - holes 23 are provided on the transverse sound beam 16, and the two through - holes 23 are symmetric about the arc symmetry line of the transverse sound beam 16 (see Fig.10 ). Circular notches 19 are provided on the connecting side edges of the transverse sound beam 16 and the panel 1 and the side plate 3 (see Fig.10 ), in the assembled state, the circular notches 19 and the inner walls of the panel 1 and the side plate 3 form crescent holes 20 (see Figure 4 ). The bottom of the arc of the transverse sound beam 16 is suspended relative to the bottom plate 2 (see Figure 4 ).

[0051] An upper reinforcing plate 17 is fixedly installed between the two upper sound beams 6 (see Figure 2 and Figure 4 ), a lower reinforcing plate 18 is fixedly installed between the two lower sound beams 7 (see Figure 3 and Figure 4 ). The first groove 8, the second groove 9, the third groove 10 and the fourth groove 11 are all arc-shaped grooves.

[0052] The following is an explanation of other implementations and structural changes of the present invention:

[0053] 1. In the above embodiment, the two upper beams 6 are parallel and juxtaposed in the width direction of the resonance box (see Figure 2 ). The two lower beams 7 are parallel and juxtaposed (see Figure 3 ). However, the present invention is not limited thereto, and 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, but parallel arrangement is optimal, which is easily understood and accepted by those skilled in the art.

[0054] 2. In the above embodiments, the inner walls of the panel 1 and the bottom plate 2 are both 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 harp, the panel 1 is more important than the bottom plate 2. The reason is that the strings are provided on the panel 1, while the bottom plate 2 is not directly related to the strings, which is easy to understand for those skilled in the art.

[0055] 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.

[0056] 4. In the above embodiment, three first grooves 8 are provided on the inner wall of the panel 1 (see Figure 2 ), three third grooves 10 are provided on the inner wall of the bottom plate 2 (see Figure 3 ). 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.

[0057] 5. In the above embodiment, three transverse beams 16 are provided in the resonance chamber, and each transverse beam 16 is arranged at a position of a first groove 8 (see Figure 2 ). However, the present invention is not limited thereto, and each transverse beam 16 can be decomposed into two left and right parts, and arranged symmetrically with respect to the central plane of the second groove 9. This is easily understood and accepted by those skilled in the art.

[0058] 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.

[0059] 7. In the above embodiment, an upper reinforcing plate 17 is fixedly mounted between the two upper sound beams 6 (see Figure 4 ), a lower reinforcement plate 18 is fixedly mounted between the two lower sound beams 7 (see Figure 4 ). 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 front panel and the back panel, 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.

[0060] 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.

[0061] 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 Figure 4 ). 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.

[0062] 10. In the above embodiment, the two upper sound beams 6 have the same shape and size (see Figure 6 The two lower sound beams 7 have the same shape and size (see Figure 8 ). 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.

[0063] 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 two-tone liangqin, 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 nail 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 nail 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 arranged crosswise 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).

2. The serpentine according to claim 1, characterized in that: 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).

3. The serpent according to claim 1, characterized in that: A transverse sound beam (16) is provided in the resonance chamber. The transverse sound beam (16) is arranged at the position of the first groove (8). The transverse sound beam (16) is generally in an arc shape, wherein the top of the arc is located in the first groove (8) and is fixedly connected to the inner wall of the panel (1), and the two sides of the arc are correspondingly fixed to the side panels (3).

4. The serpent according to claim 2, 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).

5. The serpent according to claim 2, 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).

6. The serpent 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).

7. The serpent according to claim 2, 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).

8. The serpent according to claim 3, characterized in that: The transverse tone beam (16) is provided with an avoidance notch (21) at a position corresponding to the upper tone beam (6); in the assembled state, the upper tone beam (6) is located in the avoidance notch (21); the avoidance notch (21) cooperates with the inner wall of the panel (1) to form an avoidance hole (22); the transverse tone beam (16) is provided with two oblong through holes (23); the two through holes (23) are symmetrical with respect to the arc symmetry line of the transverse tone beam (16); a circular 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 crescent hole (20) is formed between the circular notch (19) and the inner wall of the panel (1) and the side panel (3).

9. The serpent according to claim 2, 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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