A soundboard with a sound beam and a sound tunnel in an upright piano

Abstract

A soundboard with a sound beam and a sound tunnel in an upright piano, wherein a first groove and a second groove are provided on the outer wall of the soundboard, wherein the first groove is arranged transversely in the length direction of the soundboard, and the second groove is arranged longitudinally in the width direction of the soundboard; the two grooves are cross-shaped and interpenetrate each other, and the outer wall of the soundboard is equally divided into four resonance areas; a sound beam assembly is also provided in the center of the outer wall of the soundboard, including a plurality of strip-shaped sound beam components, and the strip-shaped sound beam components are arranged in pairs on both sides of the first groove and on both sides of the second groove; the first groove forms a transverse sound tunnel on the outer wall of the soundboard, and the second groove forms a longitudinal sound tunnel on the outer wall of the soundboard. The present invention changes the soundboard from the previous free vibration mode to the current standard vibration mode, and solves the problem that the treble region of the upright piano is not bright, and the bass region is not thick and round enough from the perspective of vibration, resonance, and sound generation, and especially improves the pronunciation of the bass region. Practice has proved that the improved design scheme has outstanding substantial characteristics and significant technical progress.

Description

Technical Field

[0001] The invention relates to an upright piano, in particular to a soundboard with a sound beam and a sound tunnel in the upright piano. Background Art

[0002] The piano is a keyboard instrument in Western classical music, known as the "king of musical instruments". It consists of 88 keys (52 white keys and 36 black keys) and a metal string soundboard.

[0003] The piano has six main structures, including strings, iron frame, soundboard, action system, wooden shell, and pedals. Figure 1 ) is composed of a resonance board (also called a soundboard), auxiliary wood (also called a gear), a soundboard frame and string bridges. The resonance board is like a thin plate, with auxiliary woods arranged at a certain distance pasted below, and a soundboard frame pasted around it, and the middle, high and low string bridges are fixed on it. When the strings vibrate, the soundboard vibrates through the transmission of the string bridges tightly attached to the soundboard, and the soundboard starts to work. The soundboard is one of the components that plays an important role in the quality of the sound of the piano. The strings vibrate and sound after being struck by the hammers. Through the transmission of the string bridges, the soundboard receives the vibration from the strings and enhances the sound radiation, strengthens its original sound, and broadcasts the energy it obtains from the vibrating strings into the air as much as possible.

[0004] The range of a piano is usually seven octaves, of which the treble area occupies about half an octave, the middle area occupies about four octaves, and the bass area occupies about two and a half octaves.

[0005] A common problem with traditional upright pianos is that when an upright piano sounds, its soundboard has an inherent resonant frequency. When it exceeds a certain range of the resonant frequency area, the treble area cannot be bright, and the bass area is not thick and round enough. In particular, the sound quality of the bass area has always been the shortcoming of the piano, and even limits the creative breadth of the composer. The main reason is that the current upright piano soundboard cannot meet the requirements of good broadband vibration from the treble area to the bass area, that is, it cannot adapt to the wide frequency change resonance and vibration of the treble area, the middle area and the bass area at the same time. In summary, the structural design of the soundboard of the traditional upright piano is unreasonable, which is not conducive to the soundboard to play a good sound wave vibration from the treble area to the bass area.

[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 object of the present invention is to provide a soundboard with a sound beam and a sound tunnel in an upright piano.

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

[0009] A soundboard with a sound beam and a sound tunnel in an upright piano, the soundboard being rectangular, with its inner wall disposed toward the strings of the piano;

[0010] The outer wall of the soundboard is provided with a first groove and a second groove, wherein the first groove is arranged transversely in the length direction of the soundboard, and the second groove is arranged longitudinally in the width direction of the soundboard;

[0011] The first groove and the second groove are cross-intersected and interpenetrated on the outer wall of the soundboard, and the intersection is located at the center of the soundboard, thereby dividing the outer wall of the soundboard into four equal resonance areas;

[0012] A sound beam assembly is also provided in the center of the outer wall of the sound board, and the sound beam assembly includes a plurality of strip-shaped sound beam components, and the strip-shaped sound beam components are arranged in pairs on both sides of the first groove and on both sides of the second groove;

[0013] The first groove forms a transverse sound tunnel on the outer wall of the sound board, and the second groove forms a longitudinal sound tunnel on the outer wall of the sound board.

[0014] The relevant contents in the above technical solution are explained as follows:

[0015] 1. In the above scheme, the first groove and the second groove are cross-shaped on the outer wall of the soundboard and interpenetrate each other, which helps to quickly transmit the vibration of the strings to the surroundings of the soundboard through the cross-shaped sound tunnel (i.e., the sound tunnel) formed by the grooves.

[0016] 2. In the above solution, the intersection of the first groove and the second groove is located at the center of the soundboard to improve the sound quality and timbre of the soundboard.

[0017] 3. In the above scheme, a connecting beam is provided between two adjacent sound beam components, and the connecting beam spans above the first groove and the second groove, forming the sound beam component in a tic-tac-toe shape; and each of the connecting beams is located in the central area of ​​the soundboard surface. With this design, the central area of ​​the soundboard can be strengthened.

[0018] 4. In the above scheme, each of the resonance areas of the soundboard is provided with a plurality of radiating sound beams, and the radiating sound beams in the same resonance area are arranged in parallel, and one end of at least one of the radiating sound beams faces the geometric center of the soundboard in the horizontal direction, thereby enhancing the strength of the soundboard.

[0019] 5. In the above solution, the soundboard is further provided with a plurality of radiating sound beams, the radiating sound beams are located in each of the resonance areas and are arranged radially with the horizontal center of the soundboard as a reference.

[0020] 6. In the above scheme, the soundboard is divided into a high-pitched area at the periphery, a middle-pitched area in the middle section, and a low-pitched area at the center from the sound frequency band; wherein the wall thickness of the soundboard gradually increases from the outside to the inside, 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 is located in the low-pitched area.

[0021] With this design, by setting the thicker bass area close to the center, the low-frequency vibration with a lower frequency and a larger amplitude can produce a thicker and rounder bass in the bass area of ​​the soundboard; by setting the thinner treble area far away from the center, the high-frequency vibration with a higher frequency and a smaller amplitude can produce a more transparent and bright treble in the treble area of ​​the soundboard, thereby effectively improving the timbre and sound quality produced by the upright piano in the entire frequency band.

[0022] 7. In the above solution, the strip-shaped sound beam component is composed of a wooden base and a weight block connected to the wooden base. With this design, the central area of ​​the soundboard can be strengthened, which plays a positive role in improving the timbre and sound quality of the bass area.

[0023] 8. In the above solution, the inner end thickness of the strip-shaped sound beam component is greater than the outer end thickness, and the inner end thickness of the radiating sound beam is greater than the outer end thickness. With this design, the central area of ​​the soundboard can be strengthened.

[0024] 9. In the above solution, the first groove and the second groove are both arc-shaped grooves, which can minimize the thickness change of the soundboard and avoid affecting the resonance and vibration of the soundboard.

[0025] 10. In the above solution, the lengths of the first groove and the second groove are both smaller than the horizontal width of the soundboard, and smooth transition surfaces are provided between the outer ends of the first groove and the second groove and the outer wall of the soundboard.

[0026] The working principle and advantages of the present invention are as follows:

[0027] The present invention discloses a soundboard with a sound beam and a sound tunnel in an upright piano. A first groove and a second groove are provided on the outer wall of the soundboard. The first groove is arranged transversely in the length direction of the soundboard, and the second groove is arranged longitudinally in the width direction of the soundboard. The two grooves are cross-intersecting and mutually penetrating, and the outer wall of the soundboard is equally divided into four resonance areas. A sound beam assembly is also provided in the center of the outer wall of the soundboard, including a plurality of strip-shaped sound beam components, and the strip-shaped sound beam components are arranged in pairs on both sides of the first groove and on both sides of the second groove. The first groove forms a transverse sound tunnel on the outer wall of the soundboard, and the second groove forms a longitudinal sound tunnel on the outer wall of the soundboard.

[0028] Compared with the prior art, in order to solve the problem that the existing upright piano cannot take into account the high, middle and low ranges and have good resonance timbre, the present invention improves the existing upright piano, especially the soundboard design in the upright piano. It is specifically embodied in the following aspects: first, a sound beam assembly is set on the outer wall of the soundboard; second, a cross-shaped groove is opened on the outer wall of the soundboard, so as to form a cross-shaped sound tunnel on the outer wall of the soundboard.

[0029] Aiming at the problem that the treble region of the existing upright piano is not bright, and the bass region is not thick and round enough, the present invention conducts in-depth discussion and research on the design and sound generation mechanism of the upright piano, and finds out that the main reason for the poor timbre of the treble and bass regions of the existing upright piano is due to the unreasonable design of the soundboard. Based on this, the inventor breaks the constraints of the previous vertical piano component design and boldly proposes the improved design scheme of the present invention. This improved design scheme changes the soundboard from the previous free vibration mode to the current standard vibration mode, and solves the problem that the treble region of the upright piano is not bright, and the bass region is not thick and round enough 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.

[0030] The invention improves the soundboard particularly for the prominent bass sound quality problem of the existing upright piano, thereby making up for the shortcoming of the piano's range and broadening the creative scope of the composer.

[0031] Due to the application of the above technical solution, the present invention has the following advantages and effects compared with the existing upright piano soundboard:

[0032] 1. The present invention sets a sound beam assembly on the outer wall of the soundboard. Since the bass has a larger amplitude and lower frequency than the treble, the bass resonance is concentrated in the central area of ​​the soundboard close to the voice coil, and the treble resonance is concentrated in the surrounding edge areas of the soundboard, which strengthens the strength of the central area of ​​the soundboard and plays an important role in improving the timbre and sound quality of the bass area. Since the thickness of the soundboard is a gradual thickness structure with a thick central area and thin surrounding areas, the strength of the central area of ​​the soundboard is strengthened, and the thickness difference between the central area and the surrounding edge areas of the soundboard is relatively changed, which can also play a beneficial role in improving the timbre and sound quality of the treble area.

[0033] 2. The present invention provides a cross-shaped groove on the outer wall of the soundboard, which actually forms a cross-shaped sound tunnel on the outer wall of the soundboard. The vibration is collected by the center of the soundboard and quickly transmitted to the edges of the soundboard through the cross-shaped sound tunnel (i.e., the sound tunnel), which plays a key role in improving the timbre and sound quality of the high-pitched area.

[0034] 3. The present invention divides the soundboard into four resonance areas by designing the sound beam assembly and the cross-shaped groove. When the piano is played, the vibration of the strings is first transmitted to the central area where the sound tunnels intersect, and then transmitted to the four resonance areas through the sound tunnels, and resonance and vibration are generated, thereby amplifying the string sound into the resonance sound of the soundboard. Before the improvement, the piano can only produce three sound wave quantities when playing, that is, in the resonance cavity, the corresponding area of ​​the soundboard is a resonance area, and the resonance area produces a sound wave quantity, plus a string wave quantity, plus a percussion wave quantity, a total of three sound wave quantities. After the improvement, the piano of the present invention can produce six sound wave quantities when playing, wherein four resonance areas produce four sound wave quantities, plus a string wave quantity, plus a percussion wave quantity, a total of six sound wave quantities. 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 soundboard. Usually, each resonance area of ​​the instrument produces a sound wave quantity when playing, and the number of sound waves produced is the same as the number of resonance areas. In addition, the amount of sound waves directly affects the timbre, penetration and volume of the musical instrument. Therefore, the design of the present invention can significantly improve the timbre of the high and low pitches and increase the penetration of the high and low pitches.

[0035] 4. The grooves of the present invention are all arc-shaped, which can reduce the thickness mutation of the soundboard as much as possible and avoid affecting the resonance and vibration of the soundboard. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Attached Figure 1 This is a schematic diagram of the structure of a traditional upright piano soundboard;

[0037] Attached Figure 2 This is a schematic diagram of the structure of a soundboard according to an embodiment of the present invention (without a connecting beam);

[0038] Attached Figure 3 This is a schematic diagram of the structure of a soundboard according to an embodiment of the present invention (with a connecting beam);

[0039] Attached Figure 4 is a schematic side view of a soundboard according to an embodiment of the present invention (without a connecting beam);

[0040] Attached Figure 5 A side view schematic diagram of a soundboard according to an embodiment of the present invention (with a connecting beam);

[0041] Attached Figure 6 Schematic cross-sectional view of a soundboard body according to an embodiment of the present invention;

[0042] Attached Figure 7 It is a structural schematic diagram of a sound beam assembly according to an embodiment of the present invention (with a connecting beam);

[0043] Attached Figure 8 It is a side view schematic diagram of the sound beam assembly of an embodiment of the present invention (with a connecting beam);

[0044] Attached Fig. 9 It is a schematic diagram of the structure of the radiating sound beam according to an embodiment of the present invention;

[0045] Attached Fig.10 It is a schematic side view of a radiating sound beam according to an embodiment of the present invention.

[0046] In the above figures: 1. Soundboard; 2. First groove; 3. Second groove; 4. Sound beam assembly; 4a. Strip sound beam member; 4b. Connecting beam; 5. Radiating sound beam; 6. Resonance area; 7. Wooden base; 8. Weight block. DETAILED DESCRIPTION

[0047] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0048] Embodiment: The present invention will be clearly described below with drawings 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.

[0049] As used herein, “connected” or “configured” may refer to direct physical contact or indirect physical contact between two or more components or devices, or may refer to mutual operation or action between two or more components or devices.

[0050] The terms “include,” “including,” “have,” etc. used in this document are open-ended terms, meaning including but not limited to.

[0051] 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.

[0052] See attached Figures 2~10 As shown, a soundboard with a sound beam and a sound tunnel in an upright piano, the soundboard 1 is rectangular, and its inner wall is arranged toward the strings of the piano.

[0053] The outer wall of the soundboard 1 is provided with a first groove 2 and a second groove 3 , which are cross-intersected and interconnected on the outer wall of the soundboard 1 , with the intersection being located at the center of the soundboard 1 , thereby dividing the outer wall of the soundboard 1 into four resonance areas 6 .

[0054] The first groove 2 is located at the center line of the soundboard 1 in the length direction, forming a transverse sound tunnel on the outer wall of the soundboard 1; the second groove 3 is located at the center line of the soundboard 1 in the width direction, forming a longitudinal sound tunnel on the outer wall of the soundboard 1.

[0055] By opening a cross-shaped groove on the outer wall of the soundboard 1, the cross-shaped groove actually forms a cross-shaped sound tunnel on the outer wall of the soundboard 1, and the area close to the center collects the vibration of the strings, and then quickly transmits it to the edges around the soundboard 1 through the cross-shaped sound tunnel, which plays a key role in improving the timbre and sound quality of the high-pitched area. At the same time, by equally dividing the soundboard 1 into four resonance areas 6, the vibration can be transmitted to the four resonance areas 6 through the sound tunnel and generate resonance, which can significantly improve the timbre of the high-pitched area and the low-pitched area.

[0056] A sound beam assembly 4 is also provided in the center of the outer wall of the sound board 1 . The sound beam assembly 4 includes a plurality of strip-shaped sound beam components 4 a . The strip-shaped sound beam components 4 a are arranged in pairs on both sides of the first groove 2 and on both sides of the second groove 3 .

[0057] By arranging the sound beam assembly 4 on the outer wall of the soundboard 1, since the bass has a larger amplitude and lower frequency than the treble, the bass resonance is concentrated in the central area of ​​the soundboard 1, and the treble resonance is concentrated in the peripheral edge areas of the soundboard 1, thereby strengthening the strength of the central area of ​​the soundboard 1, which plays an important role in improving the timbre and sound quality of the bass area. Since the thickness of the soundboard 1 is a gradual thickness structure in which the central area is thick and the peripheral areas are thin (i.e., a design of thin outside and thick inside), the strength of the central area of ​​the soundboard 1 is strengthened, and the thickness difference between the central area and the peripheral edge areas of the soundboard 1 is relatively changed, which can also play a beneficial role in improving the timbre and sound quality of the treble area.

[0058] Preferably, Figure 3 , 5 As shown, a connecting beam 4b is provided between two adjacent sound beam components 4a, and the connecting beam 4b spans over the first groove 2 and the second groove 3, forming the sound beam assembly in a tic-tac-toe shape; and each of the connecting beams 4b is located in the central area of ​​the surface of the soundboard 1. The four connecting beams 4b form a "mouth"-shaped reinforcement structure, which further strengthens the bass area in the center of the soundboard 1, so as to further improve the sound quality of the bass area of ​​the piano.

[0059] Preferably, the soundboard 1 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 frequency band; wherein the wall thickness of the soundboard 1 gradually increases from the outside to the inside, 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; by this design, by setting the thicker low-pitched area close to the center, 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 soundboard 1; by setting the thinner high-pitched area far from the center, 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 soundboard 1. The sound beam assembly 4 is located in the low-pitched area, which can further increase the load in the middle area of ​​the soundboard 1.

[0060] Preferably, Figure 7, 8 As shown, the strip-shaped sound beam component 4a is composed of a wooden base 7 and a weight block 8 connected to the wooden base 7. With this design, the central area of ​​the soundboard 1 can be further strengthened, which plays a positive role in improving the timbre and sound quality of the bass area.

[0061] Preferably, each of the resonance areas 6 of the soundboard 1 is provided with a plurality of radiating beams 5 of equal number, the radiating beams 5 in the same resonance area are arranged in parallel, and one end of at least one of the radiating beams 5 faces the geometric center of the soundboard 1. In addition, the radiating beams 5 can also be arranged radially with the horizontal center of the soundboard 1 as a reference.

[0062] Preferably, the inner end thickness of the strip-shaped sound beam component 4a is greater than the outer end thickness, and the inner end thickness of the radiation sound beam 5 is greater than the outer end thickness. With this design, the central area of ​​the soundboard 1 can be strengthened.

[0063] Preferably, the first groove 2 and the second groove 3 are both arc-shaped grooves, which can minimize the thickness change of the soundboard 1 and avoid affecting the resonance and vibration of the soundboard 1. The lengths of the first groove 2 and the second groove 3 are both smaller than the horizontal width of the soundboard 1; and smooth transition surfaces are provided between the outer ends of the two grooves 2 and 3 and the outer wall of the soundboard 1, so that the vibration is more evenly transmitted to the periphery of the soundboard 1.

[0064] The following is an explanation of other implementations and structural changes of the present invention:

[0065] 1. In the above embodiments, the soundboard 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 soundboards with similar structures should be covered within the protection scope of the present invention if they adopt the technical features of the present invention.

[0066] 2. In the above embodiments, the number of the sound beam assemblies 4 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 sound board 1, which is easily understood and accepted by those skilled in the art.

[0067] 3. In the above embodiment, the strip-shaped sound beam member 4a may have an arc as shown in the figure and include a long side and a short side, and the long sides of two adjacent strip-shaped sound beam members 4a are arranged in pairs on both sides of the first groove 2, and the short sides of two adjacent strip-shaped sound beam members 4a are arranged in pairs on both sides of the second groove 3;

[0068] Alternatively, the strip-shaped sound beam members 4 a may also be straight strips, which are combined in pairs at 90 degrees and arranged in pairs on both sides of the first groove 2 and on both sides of the second groove 3 .

[0069] 4. In the above embodiments, the first groove 2 and the second groove 3 are arc-shaped grooves. However, the present invention is not limited thereto, and the grooves may 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.

[0070] Compared with the prior art, in order to solve the problem that the existing upright piano cannot take into account the high, middle and low ranges and have good resonance timbre, the present invention improves the existing upright piano, especially the soundboard design in the upright piano. It is specifically embodied in the following aspects: first, a sound beam assembly is set on the outer wall of the soundboard; second, a cross-shaped groove is opened on the outer wall of the soundboard, so as to form a cross-shaped sound tunnel on the outer wall of the soundboard.

[0071] Aiming at the problem that the treble region of the existing upright piano is not bright, and the bass region is not thick and round enough, the present invention conducts in-depth discussion and research on the design and sound generation mechanism of the upright piano, and finds out that the main reason for the poor timbre of the treble and bass regions of the existing upright piano is due to the unreasonable design of the soundboard. Based on this, the inventor breaks the constraints of the previous vertical piano component design and boldly proposes the improved design scheme of the present invention. This improved design scheme changes the soundboard from the previous free vibration mode to the current standard vibration mode, and solves the problem that the treble region of the upright piano is not bright, and the bass region is not thick and round enough 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.

[0072] The invention improves the soundboard particularly for the prominent bass sound quality problem of the existing upright piano, thereby making up for the shortcoming of the piano's range and broadening the creative scope of the composer.

[0073] 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 soundboard with a sound beam and a sound tunnel in an upright piano, characterized in that: The soundboard (1) is rectangular, and its inner wall is arranged toward the piano strings; The outer wall of the sound board (1) is provided with a first groove (2) and a second groove (3), wherein the first groove (2) is arranged transversely in the length direction of the sound board (1), and the second groove (3) is arranged longitudinally in the width direction of the sound board (1); The first groove (2) and the second groove (3) are arranged on the outer wall of the soundboard (1) in a cross shape and are interconnected, with the intersection being located at the center of the soundboard (1), thereby dividing the outer wall of the soundboard (1) into four resonance areas (6); A sound beam assembly (4) is also provided in the center of the outer wall of the sound board (1), the sound beam assembly (4) comprising a plurality of strip-shaped sound beam components (4a), the strip-shaped sound beam components (4a) being arranged in pairs on both sides of the first groove (2) and on both sides of the second groove (3); The first groove (2) forms a transverse sound tunnel on the outer wall of the sound board (1), and the second groove (3) forms a longitudinal sound tunnel on the outer wall of the sound board (1); The soundboard (1) 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 in terms of the sound frequency band; The wall thickness of the soundboard (1) gradually increases from the outside to the inside, the wall thickness of the bass area is greater than the wall thickness of the mid-range area, and the wall thickness of the mid-range area is greater than the wall thickness of the treble area; The sound beam assembly (4) is located in the bass region.

2. The soundboard according to claim 1, characterized in that: The strip-shaped sound beam component (4a) is composed of a wooden base (7) and a weight-increasing block (8) connected to the wooden base (7).

3. The soundboard according to claim 1, characterized in that: A connecting beam (4b) is provided between two adjacent strip-shaped sound beam components (4a), and the connecting beam (4b) spans over the first groove (2) and the second groove (3), forming the sound beam assembly (4) in a tic-tac-toe shape; and each of the connecting beams (4b) is located in a central area of ​​the surface of the sound board (1).

4. The soundboard according to claim 1, characterized in that: A plurality of radiating sound beams (5) are respectively provided in each of the resonance areas (6) of the sound board (1); the radiating sound beams (5) in the same resonance area are arranged in parallel, and one end of at least one of the radiating sound beams (5) faces the geometric center of the sound board (1) in a horizontal direction.

5. The soundboard according to claim 1, characterized in that: The soundboard (1) is also provided with a plurality of radiating sound beams (5), the radiating sound beams (5) being located in each of the resonance areas (6) and being arranged radially with the center of the soundboard (1) in the horizontal direction as a reference.

6. The soundboard according to claim 4 or 5, characterized in that: The thickness of the inner end of the radiating sound beam (5) is greater than the thickness of the outer end.

7. The soundboard according to claim 1, characterized in that: The inner end thickness of the strip-shaped sound beam component (4a) is greater than the outer end thickness.

8. The soundboard according to claim 1, characterized in that: The first groove (2) and the second groove (3) are both arc-shaped grooves.

9. The soundboard according to claim 1, characterized in that: The lengths of the first groove (2) and the second groove (3) are both smaller than the horizontal width of the sound board (1); and smooth transition surfaces are provided between the outer ends of the first groove (2) and the second groove (3) and the outer wall of the sound board (1).

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