Erhu with membrane provided with sound beam and sound tunnel

Abstract

A erhu with a membrane provided with a sound beam and a sound tunnel, the front end of the sound box is covered with a membrane; a sound beam assembly is provided on the inner surface of the membrane; the sound beam assembly is positioned in the middle of the inner surface of the membrane to define a central area; the sound beam assembly includes a plurality of arcuate sound beam components, and a gap is formed between two adjacent arcuate sound beam components; an annular area and a plurality of radiating grooves are also formed on the inner surface of the membrane; the annular area surrounds the central area, and the radiating grooves are evenly arranged in a radial shape, dividing the inner surface of the membrane outside the sound beam assembly into a plurality of resonance areas; the radiating grooves are aligned with the gaps between the two arcuate sound beam components, and the inner ends of the radiating grooves are connected to the annular area; the radiating grooves are concavely arranged on the inner surface of the membrane to form a sound tunnel. The present invention changes the membrane from the previous free vibration mode to the current standard vibration mode, and solves the problem that the high pitch area of ​​the erhu is not bright, and the low pitch area is not thick and round enough from the perspective of vibration, resonance, and sound generation.

Description

Technical Field

[0001] The invention relates to a stringed instrument, in particular to an erhu with a membrane provided with a sound beam and a sound tunnel. Background Art

[0002] Erhu, also known as two-stringed huqin, originated in the Tang Dynasty and was called "Xiqin" in ancient times. It is a traditional Chinese stringed instrument. Erhu has a soft tone and rich expressiveness. It is an important instrument in the national orchestra. It is good at playing delicate lyrical tunes and has the beauty of human voice.

[0003] like Figure 1 , 2 As shown, the erhu is composed of a sound box 1, a sound bar 2 and a sound peg 3. Among them, the sound box 1 is the resonance box of the erhu, and its front end is covered with a membrane 0.

[0004] The range of the erhu is usually three and a half octaves, of which the high pitch accounts for about half of the range, the low pitch accounts for about one seventh of the range, and the rest is the middle pitch. At present, due to the limitations of the traditional structural design, the erhu has a common problem: the timbre of the high and low pitches is not good, and the timbre effect of the erhu is not brought into play. Specifically, the high pitch is not bright, and the low pitch is not thick and round enough.

[0005] The main reason is that the current resonance box of the erhu cannot meet the requirements of good broadband vibration from the high pitch to the low pitch, that is, it cannot adapt to the wide frequency change resonance and vibration of the high pitch, middle pitch and low pitch at the same time. Further research shows that there are many factors that affect the broadband vibration in the resonance box. In addition to the barrel and the sound window, the main problem is the design of the traditional membrane. That is, the membrane design of the existing resonance box is unreasonable, which is not conducive to the resonance box to achieve good sound wave resonance and vibration from the high pitch to the low pitch.

[0006] Therefore, how to solve the above-mentioned deficiencies in the prior art has become a subject to be studied and solved by the present invention. Summary of the invention

[0007] The purpose of the present invention is to provide an erhu with a membrane provided with a sound beam and a sound tunnel.

[0008] In order to achieve the above object, the technical solution adopted by the present invention is:

[0009] An erhu with a membrane provided with a sound beam and a sound tunnel, comprising a sound box, a sound bar and sound pegs; the front end of the sound box is covered with a membrane;

[0010] A sound beam assembly is provided on the inner surface of the membrane facing the inside of the sound box;

[0011] The sound beam assembly is positioned at the middle of the inner surface of the membrane, and defines a central area at the center of the inner surface of the membrane;

[0012] The sound beam assembly includes a plurality of arc-shaped sound beam components, each of which is arranged in a ring shape around the center of the membrane in the horizontal direction, and a gap is formed between two adjacent arc-shaped sound beam components;

[0013] An annular area and at least two radiating grooves are also formed on the inner surface of the membrane; the annular area is arranged around the central area and is located between the sound beam assembly and the central area; the radiating grooves are evenly arranged radially based on the center of the membrane in the horizontal direction, thereby dividing the inner surface of the membrane located outside the sound beam assembly into a plurality of resonance areas; the radiating grooves are aligned with the gap between the two arc-shaped sound beam components one by one, the radiating grooves are arranged in the gap, and the inner ends of the radiating grooves are connected to the annular area;

[0014] Wherein, the radiation groove is recessed on the inner surface of the membrane to form a sound tunnel.

[0015] The relevant contents in the above technical solution are explained as follows:

[0016] 1. In the above solution, "the annular area is arranged around the central area and is located on the inner side of the sound beam assembly", and this design can help the annular area to collect the vibration of the central area of ​​the membrane. The annular area can be an annular groove.

[0017] 2. In the above scheme, "each of the radiating grooves is evenly arranged radially with the center of the membrane in the horizontal direction as the reference", which helps to quickly transmit the vibration of the central area to the surrounding areas of the membrane through the radial sound tunnel (i.e., the sound tunnel) formed by the radiating grooves.

[0018] 3. In the above solution, a supporting sound beam is also provided on the inner surface of the membrane facing the inside of the piano body;

[0019] The supporting sound beam is suspended above the sound beam assembly, and the supporting sound beam includes a plurality of straight sound beam components, and the straight sound beam components are arranged one by one in alignment with the radiation grooves, so that the supporting sound beam is radial; wherein, each of the straight sound beam components has a supporting foot underneath, and the supporting foot is supported and positioned in each of the radiation grooves, and the width of the supporting foot is smaller than the width of the radiation groove.

[0020] 4. The above solution further comprises a metal ring, which is pressed on the joint between the membrane and the sound box to tighten the connection between the membrane and the sound box and reduce the influence of changes in air temperature and humidity on the tension of the membrane.

[0021] 5. In the above solution, the support foot is in the shape of a long and thin strip, and its length direction corresponds to the length direction of the radiation groove. This design can avoid blocking the sound tunnel, while ensuring the supporting effect of the supporting beam on the middle part of the membrane, and avoid adverse effects on the transmission of vibration.

[0022] 6. In the above scheme, the membrane is divided into a high-pitched area at the periphery, a mid-pitched area at the middle section, and a low-pitched area at the center from the sound-generating band; the wall thickness of the membrane gradually increases from the outside to the inside, the wall thickness of the low-pitched area is greater than that of the mid-pitched area, and the wall thickness of the mid-pitched area is greater than that of the high-pitched area; the sound beam assembly is located in the low-pitched area.

[0023] With this design, the bass area of ​​the diaphragm is strengthened through the sound beam assembly, so that the low-frequency vibration with lower frequency and larger amplitude can produce a thicker and rounder bass in the bass area of ​​the diaphragm; the mid-range area of ​​the diaphragm is strengthened by supporting the sound beam, which can improve the timbre and sound quality of the membrane in the mid-range area; and by setting the thinner treble area away from the center of the diaphragm, the high-frequency vibration with higher frequency and smaller amplitude can produce a more transparent and bright treble in the treble area of ​​the membrane, thereby effectively improving the timbre and sound quality produced by the erhu in the entire frequency band.

[0024] 7. In the above solution, the thickness of the central area of ​​the membrane is greater than the thickness of other areas of the membrane. With this design, by setting the thicker bass area at the center of the membrane, the strengthened bass area helps to further improve the bass timbre and sound quality of the erhu.

[0025] 8. In the above solution, the supporting beam also has a central supporting foot, which is supported and positioned at the center of the central area of ​​the membrane. This design helps to further strengthen the bass strength of the membrane, thereby further improving the bass timbre and sound quality of the erhu.

[0026] 9. In the above solution, the radiation groove is arranged in the gap. This design is conducive to transmitting vibration through the sound tunnel, thereby being more conducive to improving the vibration response rate of the membrane.

[0027] 10. In the above scheme, when the membrane is horizontal, the center line of the sound beam assembly in the vertical direction overlaps with the center line of the membrane in the vertical direction, so as to improve the sound quality and timbre.

[0028] 11. In the above scheme, the annular area is an annular groove. Each of the radiation grooves and the annular groove is an arc groove, which can minimize the thickness mutation of the membrane and avoid affecting the resonance and vibration of the membrane.

[0029] 12. In the above solution, a smooth transition surface is provided between the outer end of the radiation groove and the surface of the membrane, so that the vibration is transmitted to the periphery of the membrane more evenly.

[0030] The working principle and advantages of the present invention are as follows:

[0031] The present invention discloses an erhu with a membrane provided with a sound beam and a sound tunnel, wherein the front end of the sound box is covered with a membrane; a sound beam assembly is provided on the inner surface of the membrane; the sound beam assembly is positioned in the middle of the inner surface of the membrane to define a central area; the sound beam assembly includes a plurality of arc-shaped sound beam components, and a gap is formed between two adjacent arc-shaped sound beam components; an annular area and a plurality of radiating grooves are also formed on the inner surface of the membrane; the annular area surrounds the central area, and the radiating grooves are evenly arranged in a radial shape, dividing the inner surface of the membrane outside the sound beam assembly into a plurality of resonance areas; the radiating grooves are aligned with the gaps between the two arc-shaped sound beam components one by one, and the inner ends of the radiating grooves are connected to the annular area; the radiating grooves are recessed in the inner surface of the membrane to form a sound tunnel.

[0032] Compared with the prior art, in order to solve the problem that the existing erhu cannot take into account the high, middle and low ranges and have good resonance timbre, the present invention improves the existing erhu, especially the membrane design of the erhu. It is specifically embodied in the following aspects: first, a sound beam assembly is set on the inner surface of the membrane; second, radial grooves are opened on the inner surface of the membrane, so as to form a radial sound tunnel on the inner surface of the membrane.

[0033] Aiming at the problem that the existing erhu has poor timbre in the high pitch and not thick and round enough in the low pitch, the present invention conducts in-depth discussion and research on the design and sound-generating mechanism of the erhu, and finds out that the main reason for the poor timbre in the high and low pitch of the existing erhu is due to the unreasonable design of the membrane. Based on this, the inventor breaks the constraints of the previous erhu composition design and boldly proposes the improved design scheme of the present invention, which changes the membrane from the previous free vibration mode to the current standard vibration mode, and solves the problem that the erhu has poor timbre in the high pitch and not thick and round enough in the low pitch from the perspective of vibration, resonance and sound generation. Practice has proved that the improved design scheme has outstanding substantive characteristics and significant technical progress, and has achieved obvious technical effects.

[0034] The present invention improves the membrane particularly to address the prominent sound quality problem of the bass range of the existing erhu, thereby making up for the shortcoming of the erhu's range and broadening the creative scope of the composer.

[0035] Due to the application of the above technical solution, the present invention has the following advantages and effects compared with the existing erhu:

[0036] 1. The present invention sets a sound beam assembly on the inner surface of the membrane. Since the bass has a larger amplitude and lower frequency than the treble, the bass resonance is concentrated in the central area of ​​the membrane, and the treble resonance is concentrated in the peripheral edge areas of the membrane. Strengthening the strength of the central area of ​​the membrane plays an important role in improving the timbre and sound quality of the bass area. Since the thickness of the membrane is thick in the central area and thin around the periphery, the strength of the central area of ​​the membrane is strengthened, and the thickness difference between the central area of ​​the membrane and the peripheral edge areas is relatively changed, which also plays a beneficial role in improving the timbre and sound quality of the treble area.

[0037] 2. The present invention provides radial grooves on the inner surface of the membrane, which actually form radial sound tunnels on the inner surface of the membrane. The vibration is collected by the annular area on the membrane and quickly transmitted to the surrounding edges of the membrane through the radial sound tunnels (i.e., sound tunnels), which plays a key role in improving the timbre and sound quality of the high-pitched area.

[0038] 3. The present invention uses the design of the sound beam assembly and radial grooves, and when the number of radial grooves is four, four resonance areas can be equally divided on the membrane. When the erhu is played, the vibration of the string is first transmitted to the central area of ​​the membrane, and then transmitted to each resonance area through the sound tunnel, and resonance and vibration are generated, thereby amplifying the string sound into the resonance sound of the membrane. Before the improvement, the erhu can only generate three sound waves when it is played, that is, the area corresponding to the membrane is a resonance area, and the resonance area generates one sound wave, plus one string wave, plus one percussion wave, a total of three sound waves. After the improvement, the erhu of the present invention can generate six sound waves when it is played, among which four resonance areas generate four sound waves, plus one string wave, plus one percussion wave, a total of six sound waves.

[0039] The sound wave quantity is the number of sound waves. For a specific stringed instrument, in addition to a string wave quantity and a percussion wave quantity, it mainly depends on the number of resonance areas of the membrane. Usually, when the instrument is played, each resonance area generates a sound wave quantity, and the number of sound waves generated depends on 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 high and low pitch areas and increase the penetration of the high and low pitch areas. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Attached Figure 1 It is a schematic diagram of the structure of the existing erhu;

[0041] Attached Figure 2 The figure is a cross-sectional view of a conventional erhu instrument tube;

[0042] Attached Figure 3 is a schematic cross-sectional view of a piano barrel in an embodiment of the present invention;

[0043] Attached Figure 4 for Figure 3Schematic diagram of the cross section at AA;

[0044] Attached Figure 5 It is a structural schematic diagram of the arc-shaped sound beam component in an embodiment of the present invention;

[0045] Attached Figure 6 for Figure 5 Side view of

[0046] Attached Figure 7 It is a schematic diagram of the structure of the supporting sound beam in an embodiment of the present invention;

[0047] Attached Figure 8 for Figure 7 sectional view of .

[0048] In the above figures: 0. membrane; 1. sound box; 2. neck; 3. pegs; 4. membrane; 5. sound beam assembly; 5a. arc sound beam component; 6. support sound beam; 6a. straight sound beam component; 6b. support foot; 6c. center support foot; 7. center area; 8. annular area; 9. radiating groove; 10. resonance area; 11. gap; 12. metal ring. DETAILED DESCRIPTION

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

[0050] Embodiment: The present invention will be clearly described below with diagrams and detailed descriptions. After understanding the embodiments of the present invention, any person skilled in the art can make changes and modifications based on the techniques taught by the present invention without departing from the spirit and scope of the present invention.

[0051] The terms used herein are only for describing specific embodiments and are not intended to be limiting of the present invention. Singular forms such as "a", "this", "here", "this" and "the" as used herein also include plural forms.

[0052] As used herein, “connected” or “positioned” may refer to two or more components or devices being in direct physical contact with each other, or being in indirect physical contact with each other, or may refer to two or more components or devices operating or moving with each other.

[0053] The terms “include,” “including,” “have,” etc. used in this document are open-ended terms, meaning including but not limited to.

[0054] The terms used in this document generally have the ordinary meaning of each term used in this field, in the context of the case and in the specific context, unless otherwise noted. Certain terms used to describe the present invention will be discussed below or elsewhere in this specification to provide additional guidance to those skilled in the art in describing the present invention.

[0055] See attached Figures 3~8 As shown, an erhu with a membrane provided with a sound beam and a sound tunnel is composed of a sound box 1, a neck 2 and pegs 3; the front end of the sound box 1 is covered with a membrane 4.

[0056] A sound beam assembly 5 and a supporting sound beam 6 are provided on the inner surface of the membrane 4 facing the inside of the sound box 1 ; the sound beam assembly 5 is positioned in the middle of the inner surface of the membrane 4 , and defines a central area 7 at the center of the inner surface of the membrane 4 .

[0057] The sound beam assembly 5 includes four arc-shaped sound beam components 5 a , each of which is arranged in a ring around the center of the membrane 4 in the horizontal direction, and a gap 11 is formed between two adjacent arc-shaped sound beam components 5 a .

[0058] An annular area 8 and four radiating grooves 9 are also formed on the inner surface of the membrane 4; the annular area 8 can be an annular groove, which is arranged around the central area 7 and is located between the sound beam assembly 5 and the central area 7, which can help the annular area 8 to collect the vibration of the central area 7 of the membrane 4.

[0059] The radiation grooves 9 are recessed on the inner surface of the membrane 4 to form a sound tunnel. The radiation grooves 9 are evenly arranged radially with the center of the membrane 4 in the horizontal direction as the reference, which helps to quickly transmit the vibration of the central area 7 to the surroundings of the membrane 4 through the radial sound tunnel formed by the radiation grooves 9. The inner ends of the radiation grooves 9 are connected to the annular area 8, thereby dividing the inner surface of the membrane 4 located outside the sound beam assembly 5 into a plurality of resonance areas 10.

[0060] The radiating grooves 9 are aligned one by one with the gaps 11 between the two arc-shaped sound beam components 5 a . The radiating grooves 9 penetrate the gaps 11 , and the inner ends of the radiating grooves 9 are connected to the annular area 8 .

[0061] The supporting sound beam 6 is suspended above the sound beam assembly 5. The supporting sound beam 6 is in a cross shape and includes four straight sound beam components 6a. The straight sound beam components 6a are arranged one by one with the radiation grooves 9, so that the supporting sound beam 6 is in a radial shape; wherein, each of the straight sound beam components 6a has a supporting foot 6b at the bottom, and the supporting foot 6b is supported and positioned in each of the radiation grooves 9, and the width of the supporting foot 6b is smaller than the width of the radiation groove 9.

[0062] Preferably, the support foot 6b is in the shape of an elongated strip, and its length direction corresponds to the length direction of the radiation groove 9. This can avoid blocking the sound tunnel, and while ensuring the supporting effect of the supporting beam 6 on the middle part of the membrane 4, avoid adverse effects on the transmission of vibration.

[0063] Preferably, it also includes a metal ring 12, which is pressed onto the joint between the diaphragm 4 and the sound box 1 to tighten the connection between the diaphragm 4 and the sound box 1 and reduce the influence of changes in air temperature and humidity on the tension of the diaphragm 4.

[0064] Preferably, the membrane 4 is divided into a high-pitched area at the periphery, a middle-pitched area at the middle section, and a low-pitched area at the center from the sound-emitting frequency band; the wall thickness of the membrane 4 gradually increases from the outside to the inside, and the wall thickness of the low-pitched area is greater than that of the middle-pitched area, and the wall thickness of the middle-pitched area is greater than that of the high-pitched area; the sound beam assembly 5 is located in the low-pitched area, and the supporting sound beam 6 can be located in the middle-pitched area. With this design, the low-pitched area of ​​the membrane 4 is strengthened by the sound beam assembly 5, so that the low-frequency vibration with a lower frequency and a larger amplitude can emit a more mellow and rounded bass in the low-pitched area of ​​the membrane 4; the middle-pitched area of ​​the membrane 4 is strengthened by the supporting sound beam 6, so that the timbre and sound quality of the membrane 4 in the middle-pitched area can be improved; by setting the thinner high-pitched area away from the center of the membrane 4, the high-frequency vibration with a higher frequency and a smaller amplitude can emit a more transparent and bright high-pitched sound in the high-pitched area of ​​the membrane 4, thereby effectively improving the timbre and sound quality of the erhu in the full frequency band.

[0065] Preferably, the thickness of the central area 7 of the membrane 4 is greater than the thickness of other areas of the membrane 4. With this design, by setting the thicker bass area at the center of the membrane 4, the strengthened bass area helps to further improve the bass timbre and sound quality of the erhu.

[0066] Preferably, the supporting sound beam 6 also has a central supporting foot 6c, which is supported and positioned at the center of the central area 7 of the membrane 4, helping to further strengthen the bass strength of the membrane 4, thereby further improving the bass timbre and sound quality of the erhu.

[0067] There is a gap 11 between the two arc-shaped sound beam components 5a, and the radiation groove 9 is arranged in the gap 11. This design is conducive to transmitting vibration through the sound tunnel, thereby being more conducive to improving the vibration response rate of the membrane 4.

[0068] Preferably, when the diaphragm 4 is horizontal, a center line of the beam assembly 5 in a vertical direction overlaps with a center line of the diaphragm 4 in a vertical direction.

[0069] Preferably, the annular groove and each of the radiation grooves 9 are arc-shaped grooves, which can minimize the thickness mutation of the membrane 4 and avoid affecting the resonance and vibration of the membrane 4.

[0070] A smooth transition surface is provided between the outer end of the radiation groove 9 and the lower surface of the membrane 4 , so that the vibration can be transmitted to the periphery of the membrane 4 more evenly.

[0071] The following is an explanation of other implementations and structural changes of the present invention:

[0072] 1. In the above embodiments, the erhu shown in the figure is only used for illustration, and its structure is not used to limit the protection scope of the present invention. Other erhu with similar structures that adopt the technical features of the present invention should be covered within the protection scope of the present invention.

[0073] 2. In the above embodiments, the number of the sound beam assemblies 5 is not limited to one group, and may also be multiple groups arranged in parallel or other designs that help to strengthen the load on the middle part of the membrane 4, which is easily understood and accepted by those skilled in the art.

[0074] 3. In the above embodiments, the annular groove and the radiating groove 9 are arc-shaped grooves. However, the present invention is not limited thereto, and the annular groove and the radiating groove 9 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.

[0075] Aiming at the problem that the existing erhu has poor timbre in the high pitch and not thick and round enough in the low pitch, the present invention conducts in-depth discussion and research on the design and sound-generating mechanism of the erhu, and finds out that the main reason for the poor timbre in the high and low pitch of the existing erhu is due to the unreasonable design of the membrane. Based on this, the inventor breaks the constraints of the previous erhu composition design and boldly proposes the improved design scheme of the present invention, which changes the membrane from the previous free vibration mode to the current standard vibration mode, and solves the problem that the erhu has poor timbre in the high pitch and not thick and round enough in the low pitch from the perspective of vibration, resonance and sound generation. Practice has proved that the improved design scheme has outstanding substantive characteristics and significant technical progress, and has achieved obvious technical effects.

[0076] The present invention improves the membrane particularly to address the prominent sound quality problem of the bass range of the existing erhu, thereby making up for the shortcoming of the erhu's range and broadening the creative scope of the composer.

[0077] 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. An erhu with a membrane provided with a sound beam and a sound tunnel, characterized in that: The instrument is composed of a sound box (1), a sound bar (2) and sound pegs (3); the front end of the sound box (1) is covered with a membrane (4); A sound beam assembly (5) is provided on the inner surface of the membrane (4) facing the inside of the sound box (1); The sound beam assembly (5) is positioned at the middle of the inner surface of the membrane (4), and defines a central area (7) at the center of the inner surface of the membrane (4); The sound beam assembly (5) comprises a plurality of arc-shaped sound beam components (5a), each of the arc-shaped sound beam components (5a) being arranged in a ring shape around the center of the membrane (4) in the horizontal direction, and a gap (11) is formed between two adjacent arc-shaped sound beam components (5a); An annular region (8) and at least two radiating grooves (9) are also formed on the inner surface of the membrane (4); the annular region (8) is arranged around the central region (7) and is located between the sound beam assembly (5) and the central region (7); the radiating grooves (9) are evenly arranged radially with the horizontal center of the membrane (4) as a reference, thereby dividing the inner surface of the membrane located outside the sound beam assembly (5) into a plurality of resonance regions (10); the radiating grooves (9) are aligned with the gap (11) between the two arc-shaped sound beam components (5a), the radiating grooves (9) are arranged in the gap (11), and the inner ends of the radiating grooves (9) are connected to the annular region (8); Wherein, the radiation groove (9) is recessed on the inner surface of the membrane (4) to form a sound tunnel; The membrane (4) is divided into a high-pitched area at the periphery, a mid-pitched area at the middle section, and a low-pitched area at the center in terms of the sound emission band; wherein the sound beam assembly (5) is located in the low-pitched area.

2. The erhu with a membrane provided with a sound beam and a sound tunnel according to claim 1, characterized in that: The inner surface of the membrane (4) facing the inside of the sound box (1) is also provided with a supporting sound beam (6); The supporting sound beam (6) is suspended above the sound beam assembly (5), and the supporting sound beam (6) comprises a plurality of straight sound beam components (6a), and the straight sound beam components (6a) are arranged one by one in alignment with the radiation grooves (9), so that the supporting sound beam (6) is in a radial shape; wherein each of the straight sound beam components (6a) has a supporting foot (6b) below, and the supporting foot (6b) is supported and positioned in each of the radiation grooves (9), and the width of the supporting foot (6b) is smaller than the width of the radiation groove (9).

3. The erhu with a membrane provided with a sound beam and a sound tunnel according to claim 1, characterized in that: It also includes a metal ring (12), which is pressed onto the junction between the membrane (4) and the sound box (1).

4. The erhu with a membrane provided with a sound beam and a sound tunnel according to claim 1, characterized in that: The thickness of the central region (7) in the membrane (4) is greater than the thickness of regions other than the central region (7).

5. The erhu with a membrane provided with a sound beam and a sound tunnel according to claim 2, characterized in that: The supporting foot (6a) is in the shape of an elongated strip, and its length direction corresponds to the length direction of the radiation groove (9).

6. The erhu with a membrane provided with a sound beam and a sound tunnel according to claim 1, characterized in that: The wall thickness of the membrane (4) gradually increases from the outside to the inside, and the wall thickness of the bass region is greater than that of the mid-range region, and the wall thickness of the mid-range region is greater than that of the treble region.

7. The erhu with a membrane provided with a sound beam and a sound tunnel according to claim 2, characterized in that: The supporting sound beam (6) also has a central supporting foot (6c), and the central supporting foot (6c) is supported and positioned at the center of the central area (7) of the membrane (4).

8. The erhu with a membrane provided with a sound beam and a sound tunnel according to claim 1, characterized in that: When the membrane (4) is horizontal, the center line of the sound beam assembly (5) in the vertical direction overlaps with the center line of the membrane (4) in the vertical direction.

9. The erhu with a membrane provided with a sound beam and a sound tunnel according to claim 1, characterized in that: The annular area (8) is an annular groove, and each of the radiation grooves (9) and the annular groove are arc-shaped grooves.

10. The erhu with a membrane provided with a sound beam and a sound tunnel according to claim 1, characterized in that: A smooth transition surface is provided between the outer end of the radiation groove (9) and the surface of the membrane (4).

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