CN111951766A - A full-band high-quality dulcimer with sound beam and sound tunnel - Google Patents

Abstract

A full-band high-quality dulcimer with sound beams and sound tunnels includes a resonance box, the resonance box includes a panel and a bottom plate, the lower surface of the panel is provided with first and second grooves, and the two grooves are crossed and penetrate each other to connect the lower surface of the panel. It is equally divided into four upper resonance areas; the middle part of the lower surface of the panel is fixed with an upper sound beam assembly, including a plurality of first strip-shaped sound beam members, and each first strip-shaped sound beam member is arranged in pairs in the first and second grooves The first and second grooves respectively form an upper transverse sound tunnel and an upper longitudinal sound tunnel on the lower surface of the panel. The invention changes the panel of the dulcimer from the previous free vibration mode to the current standard vibration mode, and solves the problem that the high-pitched area of the dulcimer cannot be bright and the low-pitched area is not rich and round enough from the perspective of vibration, resonance and sound production. Practice has proved that the improved design scheme has outstanding substantive features and significant technological progress.

Description

A full-band high-quality dulcimer with sound beam and sound tunnel

technical field

The invention relates to a stringed musical instrument, in particular to a full-frequency high-quality dulcimer with a sound beam and a sound tunnel.

Background technique

Yangqin, also known as Yangqin, Daqin, Brass-Wire Qin, Fanqin, Batqin and Butterfly Qin, is a percussion instrument and an indispensable instrument in Chinese national bands. The timbre of the dulcimer has distinct characteristics, with a large volume and a combination of rigidity and softness; when played slowly, the timbre is like a ding dong mountain spring, and when played fast, it is like a gurgling water. The tone is bright, as crisp as big beads and small beads falling on a jade plate. It is extremely expressive and can be played solo, in ensemble or as accompaniment for qinshu, rap and opera. It often plays the role of "piano accompaniment" in folk instrumental ensembles and national bands, and is an indispensable main instrument.

The structure of the dulcimer includes a resonance box, a mountain pass, a roller, a bridge, and a string. As shown in FIGS. 1 to 5 , the resonance box 1 includes a panel 2 and a bottom plate 3 arranged at intervals below the panel 2 . The upper surface of the panel 2 is provided with several bridges 4 , the lower surface of the panel 2 and the upper surface of the bottom plate 3 are spaced to support several transverse sound beams 5 (support plates), and the bottom plate 3 is provided with several sound holes 6 . Among them, there are four to five circular holes 7 on the support plate 5 , which are called wind eyes, so that the resonated sound waves are convected in the resonance box 1 and then transmitted from the sound outlet 6 .

The range of the dulcimer is usually four octaves, of which the high range occupies about two octaves, the middle range occupies about one and a half octaves, and the low range occupies about half an octave. Due to the limitation of the traditional structure design of the dulcimer at present, the common problem is that the timbre of the high-pitched and low-pitched regions is not good, and the timbre of the dulcimer has not been exerted. The specific performance is that the treble region is not bright, and the bass region is not rich and round enough. The main reason is that the current resonance box 1 of the dulcimer cannot satisfy the good broadband vibration from the treble region to the bass region, that is, it cannot simultaneously adapt to the resonance and vibration of wide frequency changes in the treble region, mid-range region and bass region. Further research shows that there are many factors affecting the broadband vibration in the resonance box 1, except for the panel 2 and the bottom plate 3, the main problem is the design of the traditional beam 5. The design of the transverse sound beam 5 of the existing resonance box 1 is unreasonable, which is not conducive to the sound wave resonance and vibration of the resonance box 1 from the high-pitched region to the low-pitched region. For example, the sound beam 5 is supported between the panel 2 and the bottom panel 3 in the resonance box 1, and corresponds to the setting position of the bridge 4, which mainly plays a mechanical role, but does not play a good acoustic role.

Therefore, how to solve the above-mentioned deficiencies in the prior art becomes the subject to be solved by the present invention.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a full-band high-quality dulcimer with a sound beam and a sound tunnel.

To achieve the above object, the technical scheme adopted in the present invention is:

A full-band high-quality dulcimer with a sound beam and a sound tunnel, comprising a resonance box, the resonance box comprising a panel and a bottom plate, wherein:

The lower surface of the panel is provided with a first groove and a second groove, the first groove and the second groove are crossed on the lower surface of the panel and pass through each other, and the intersection is located at the bottom of the panel. center, and then divide the lower surface of the panel into four upper resonance areas;

An upper sound beam assembly is fixed in the middle of the lower surface of the panel, and the upper sound beam assembly includes a plurality of first strip-shaped sound beam members, and the first strip-shaped sound beam members are arranged in pairs on two sides of the first groove. side and both sides of the second groove;

The first groove and the second groove respectively form an upper transverse sound tunnel and an upper longitudinal sound tunnel on the lower surface of the panel.

The relevant contents in the above technical solutions are explained as follows:

1. In the above solution, a third groove and a fourth groove are arranged on the upper surface of the base plate, and the third groove and the fourth groove are crossed on the upper surface of the base plate and pass through each other. The point is located in the center of the bottom plate, and then the upper surface of the bottom plate is equally divided into four lower resonance areas;

A lower sound beam assembly is fixed in the middle of the upper surface of the bottom plate, and the lower sound beam assembly includes a plurality of second strip-shaped sound beam members, and the second strip-shaped sound beam members are arranged in pairs on two sides of the third groove. side and both sides of the fourth groove;

The third groove and the fourth groove respectively form a lower transverse sound tunnel and a lower longitudinal sound tunnel on the upper surface of the bottom plate.

2. In the above solution, "the first groove and the second groove cross and penetrate each other on the lower surface of the panel", which helps to pass the vibration of the strings through the cross-shaped sound tunnel ( That is, the tunnel of sound) is rapidly transmitted around the panel;

"The third groove and the fourth groove cross and penetrate each other on the upper surface of the bottom plate", which helps to quickly transmit the vibration to the surrounding of the bottom plate through the cross-shaped sound tunnel formed by the groove.

3. In the above solution, the intersection point of the first groove and the second groove is located in the center of the panel, and the intersection point of the third groove and the fourth groove is located in the center of the bottom plate, so that the design can improve the sound quality and tone of the resonance box.

4. In the above solution, an upper connecting beam is arranged between two adjacent first strip-shaped sound beam members, and the upper connecting beam spans over the first groove and the second groove, forming the The upper sound beam assembly is in a well-shaped shape; and each of the upper connecting beams is located in the central area of the lower surface of the panel. With this design, reinforcement of the central area of the panel can be achieved.

5. In the above solution, a lower connecting beam is arranged between two adjacent second strip-shaped sound beam members, and the lower connecting beam spans over the third groove and the fourth groove to form the lower connecting beam. The sound beam assembly is in a well-shaped shape; and each of the lower connecting beams is located in the central area of the upper surface of the bottom plate. With this design, reinforcement of the central area of the base plate can be achieved.

6. In the above-mentioned scheme, the panel and the bottom plate are distinguished from the sound frequency band including the peripheral high-pitched area, the mid-range area of the middle section and the central low-pitched area; wherein, the wall thicknesses of the panel and the bottom plate are from outside to inside. Gradually thickening, the wall thickness of the bass region is larger than that of the midrange region, and the wall thickness of the midrange region is greater than the wall thickness of the treble region; the upper sound beam assembly is located in the low frequency region of the panel, and the lower sound beam Components are located in the bass region of the base plate.

With this design, by arranging the thicker bass region near the center, the low-frequency vibration with lower frequency and larger amplitude can be made to produce a richer and more rounded bass in the bass region of the panel and bottom plate; The treble area is set away from the center, which can make the high-frequency vibration with higher frequency and smaller amplitude emit more transparent and bright treble in the treble area of the panel and the bottom plate, so as to make the dulcimer sound in the whole frequency range, The sound quality has been effectively improved.

7. In the above solution, the upper bracing assembly and the lower bracing assembly are arranged in alignment in the height direction of the resonance box.

8. In the above solution, a plurality of upper radiating sound beams are respectively arranged in each of the upper resonance regions of the panel, and the upper radiating sound beams in the same upper resonance region are arranged in parallel, and one end of at least one of the upper radiating sound beams is arranged. towards the geometric center of the panel;

A plurality of lower radiating sound beams are respectively arranged in each of the lower resonance regions of the bottom plate, the lower radiating sound beams in the same lower resonance region are arranged in parallel, and one end of at least one of the lower radiating sound beams faces the geometry of the bottom plate. center.

9. In the above solution, several joists are also included, and each of the joists is vertically arranged and has an upper support foot and a lower support foot;

The upper support feet are supported and positioned in the first groove or the second groove on the lower surface of the panel, and the lower support feet are supported and positioned in the third groove or the fourth groove on the upper surface of the bottom plate, And the width of the upper support leg is smaller than the width of the first groove and the second groove, and the width of the lower support leg is smaller than the width of the third groove and the fourth groove.

10. In the above solution, the upper support leg is in the shape of an elongated strip, and its length direction corresponds to the length direction of the first groove or the second groove;

The lower support leg is in the shape of an elongated strip, and its length direction corresponds to the length direction of the third groove or the fourth groove.

11. In the above solution, the bottom plate is provided with a plurality of sound holes, and each of the sound holes is located in the third groove, the fourth groove, and the third groove and the fourth groove. interchange.

12. In the above solution, the first groove, the second groove, the third groove and the fourth groove are all arc-shaped grooves, so that the thickness of the panel and the bottom plate can be reduced as much as possible. Avoid resonance and vibration affecting the panel and bottom plate.

13. In the above solution, the lengths of the first groove and the second groove are both smaller than the width of the panel;

The lengths of the third groove and the fourth groove are both smaller than the width of the bottom plate;

A smooth transition surface is provided between the outer ends of the first groove and the second groove and the lower surface of the panel; the outer ends of the third groove and the fourth groove and the upper surface of the bottom plate There are smooth transition surfaces between them.

14. In the above solution, the thickness of the inner end of the upper sound beam assembly and the lower sound beam assembly is greater than the thickness of the outer end. With this design, the central area of the panel and the bottom plate can be reinforced.

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

The present invention is a full-band high-quality dulcimer with sound beams and sound tunnels, comprising a resonance box, the resonance box includes a panel and a bottom plate, the lower surface of the panel is provided with first and second grooves, and the two grooves are crossed and pass through each other to connect the panel. The lower surface is equally divided into four upper resonance areas; the middle part of the lower surface of the panel is fixed with an upper sound beam assembly, including a plurality of first strip-shaped sound beam components, and each first strip-shaped sound beam component is arranged in pairs on the first and second sound beam components. The two sides of the groove; the first and second grooves respectively form an upper transverse sound tunnel and an upper longitudinal sound tunnel on the lower surface of the panel.

Compared with the prior art, in order to solve the problem that the existing dulcimer cannot take into account the high, middle and low frequency regions and have good resonant timbre, the present invention improves the existing dulcimer, especially the panel design of the dulcimer. It is embodied in the following aspects: first, a sound beam assembly is erected on the panel; second, a cross-shaped groove is opened on the panel, thereby forming a cross-shaped sound tunnel on the panel.

Aiming at the problem that the high-pitched region of the dulcimer is not bright, and the low-pitched region is not rich and round enough, the invention deeply discusses and studies the design and sounding mechanism of the dulcimer, and finds out that the timbre of the existing dulcimer in the high-pitched region and the low-pitched region is not good. The main reason is due to unreasonable panel design. Accordingly, the inventor broke the shackles of the composition design of the dulcimer in the past, and boldly proposed an improved design scheme of the present invention. This improved design scheme changes the panel from the previous free vibration mode to the current standard vibration mode, from vibration, resonance, The sounding angle solves the problem that the high-pitched area of the dulcimer is not bright enough, and the low-pitched area is not rich and round enough. Practice has proved that the improved design has outstanding substantive features and significant technical progress, and has achieved obvious technical effects.

Due to the application of the above-mentioned technical scheme, the present invention has the following advantages and effects compared with the existing dulcimer:

1. The present invention sets the upper bracing assembly on the panel. Since the bass is relatively high in amplitude and low in frequency, the bass resonance is concentrated in the central area of the panel, and the treble resonance is concentrated in the surrounding edge area of the panel, which strengthens the strength of the central area of the panel. The tone and sound quality in the lower range play an important role. Because the thickness of the panel is thick in the central area and thin in the surrounding area, the thickness of the panel is strengthened, and the strength of the central area of the panel is strengthened, and the thickness gap between the central area of the panel and the surrounding edge area is relatively changed, which plays an important role in improving the tone and sound quality of the treble area effect.

The same design concept is also applicable to the improvement of the bottom plate, that is, the sound and sound quality of the dulcimer can be improved by arranging lower bracing components on the bottom plate.

2. The present invention is provided with a cross-shaped groove on the panel, and the cross-shaped groove actually forms a cross-shaped sound tunnel on the panel. The perimeter edge of the panel is transmitted, which plays a key role in improving the tone and quality of the bass and treble areas.

The same design concept is also applicable to the improvement of the bottom plate, that is, by opening a cross-shaped groove on the bottom plate, it can play an auxiliary role in improving the timbre and sound quality of the dulcimer.

3. In the present invention, four resonance areas are equally divided on the panel through the design of the upper sound beam assembly and the cross-shaped groove. When the dulcimer is played, the vibration of the strings is first transmitted to the central area of the panel, 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 panel. Only four sound waves can be generated when the front dulcimer is played, that is, in the resonance chamber, the area corresponding to the panel is a resonance area, the area corresponding to the bottom plate is a resonance area, and each resonance area generates a sound wave, plus a sine wave volume, plus a firing wave volume, for a total of four sound wave volumes. After the improvement, the dulcimer of the present invention can generate seven sound waves when playing, wherein, the four resonance regions of the panel generate four sound waves, one sound wave of the bottom plate, plus one sine wave, plus one firing wave, A total of seven sound waves.

If a cross-shaped groove is also provided on the bottom plate, and four resonance areas are equally divided on the bottom plate, ten sound waves can be generated when the dulcimer of the present invention is played after the improvement, wherein the four resonance areas of the panel generate four sound waves. The four resonance areas of the bottom plate generate four sound waves, plus one sine wave, and one firing wave, for a total of ten sound waves.

The volume of sound waves is the number of sound waves. For a stringed instrument with a specific resonance box, in addition to a string wave volume and a firing wave volume, it mainly depends on the number of resonance areas in the resonance box. The resonance area generates a sound wave volume, and the number of sound wave volume will be generated as many resonance areas. In addition, the amount of sound waves directly affects the timbre, penetration, and volume of the instrument. Therefore, the design of the present invention can obviously improve the timbre of the high-pitched region and the low-pitched region, and increase the penetrating power of the high-pitched region and the low-pitched region.

4. Each groove of the present invention adopts arc-shaped grooves, which can minimize the sudden change in thickness of the panel and avoid affecting the resonance and vibration of the panel.

Description of drawings

Accompanying drawing 1 is the structural representation of traditional Yangqin (strings are not drawn);

Accompanying drawing 2 is the cross-sectional schematic diagram of A-A in Fig. 1;

Accompanying drawing 3 is the sectional schematic diagram of B-B direction in Fig. 1;

Accompanying drawing 4 is the structural representation of the lower surface of the panel of traditional dulcimer;

Accompanying drawing 5 is the structural representation of the bottom plate of traditional dulcimer;

6 is a schematic structural diagram of the lower surface of the panel according to the embodiment of the present invention (without the upper connecting beam);

FIG. 7 is a schematic structural diagram of the lower surface of the panel according to the embodiment of the present invention (with an upper connecting beam);

Accompanying drawing 8 is A-A sectional schematic diagram (without upper connecting beam) in FIG. 6;

Accompanying drawing 9 is the left side schematic diagram of FIG. 7 (with upper connecting beam);

10 is a schematic structural diagram of the upper surface of the bottom plate according to the embodiment of the present invention (without the lower connecting beam);

11 is a schematic structural diagram of the upper surface of the base plate according to the embodiment of the present invention (with a lower connecting beam);

Accompanying drawing 12 is A-A sectional schematic diagram in FIG. 10 (without lower connecting beam);

Figure 13 is a schematic diagram of the left side of Figure 11 (with a lower connecting beam);

FIG. 14 is a schematic cross-sectional view of an embodiment of the present invention viewed from the bottom.

FIG. 15 is a schematic structural diagram of the sound beam assembly according to the embodiment of the present invention;

Accompanying drawing 16 is the left side schematic diagram of FIG. 15;

17 is a schematic structural diagram of an upper radiating sound beam according to an embodiment of the present invention;

18 is a schematic side view of the upper radiating sound beam according to the embodiment of the present invention;

19 is a schematic structural diagram of a joist according to an embodiment of the present invention;

FIG. 20 is a schematic side view of a joist according to an embodiment of the present invention.

In the above drawings: 1. sound box; 2. 3. Panel; 3. Bottom plate; 5. piano code; 5. Transverse sound beam; 7. Sound hole; Hole; 8. Panel; 8a. 9. Upper resonance area; Bottom plate; 9a. 10. The lower resonance area; Upper sound beam assembly; 10a. The first sound beam member; 10b. upper connecting beam; 11. Lower bracing assembly; 11a. The second sound beam member; 11b. lower connecting beam; 12. 13. The first groove; 13. The second groove; 15. Sound hole; 16. The third groove; The fourth groove; 17. 18. The upper radiating sound beam; hole; 19. 20. The lower radiating sound beam; joists; 20a. upper support foot; 20b. Lower support feet.

Detailed ways

Below in conjunction with accompanying drawing and embodiment, the present invention is further described:

Example: The following will clearly illustrate this case with drawings and detailed descriptions. Any person skilled in the art can change and modify the technology taught in this case after understanding the embodiments of this case, and it does not deviate from the spirit of this case. with scope.

The language used herein is intended to describe particular embodiments and is not intended to be limiting. The singular forms such as "a", "the", "the", "this" and "the", as used herein, also include the plural forms.

The terms "first", "second", etc. used herein do not specifically refer to order or order, nor are they used to limit the present case, but are only used to distinguish components or operations described in the same technical terms.

As used herein, "connecting" or "positioning" may refer to two or more components or devices in direct physical contact with each other, or in indirect physical contact with each other, and may also refer to two or more components or devices interacting with each other or action.

As used herein, "comprising", "including", "having" and the like are open-ended terms, meaning including but not limited to.

Regarding the terms (terms) used in this article, unless otherwise specified, they usually have the ordinary meaning of each term used in this field, in the content of this case and in the special content. Certain terms used to describe the present case are discussed below or elsewhere in this specification to provide those skilled in the art with additional guidance regarding the description of the present case.

Referring to Figures 6 to 20, a full-band high-quality dulcimer with sound beams and sound tunnels includes a resonance box, and the resonance box includes a panel 8 and a bottom plate 9 .

Wherein, the lower surface of the panel 8 is provided with a first groove 12 and a second groove 13 , the first groove 12 and the second groove 13 are crossed on the lower surface of the panel 8 and They penetrate each other, and the intersection is located in the center of the panel 8 , which further divides the lower surface of the panel 8 into four equal upper resonance areas 8 a.

An upper sound beam assembly 10 is fixed in the middle of the lower surface of the panel 8, and the upper sound beam assembly 10 includes a plurality of first strip-shaped sound beam members 10a, and the first strip-shaped sound beam members 10a are arranged in parallel in pairs. Both sides of the first trench 12 and both sides of the second trench 13 .

The first groove 12 and the second groove 13 respectively form an upper transverse sound tunnel and an upper longitudinal sound tunnel on the lower surface of the panel 8 .

A third groove 15 and a fourth groove 16 are provided on the upper surface of the bottom plate 9 , and the third groove 15 and the fourth groove 16 cross and penetrate each other on the upper surface of the bottom plate 9 . , the intersection is located in the center of the bottom plate 9, and then the upper surface of the bottom plate 9 is equally divided into four lower resonance regions 9a.

A lower sound beam assembly 11 is fixed in the middle of the upper surface of the bottom plate 9, and the lower sound beam assembly 11 includes a plurality of second strip-shaped sound beam members 11a, and the second strip-shaped sound beam members 11a are arranged in parallel in pairs on both sides of the third trench 15 and both sides of the fourth trench 16 .

The third groove 15 and the fourth groove 16 respectively form a lower transverse sound tunnel and a lower longitudinal sound tunnel on the upper surface of the bottom plate 9 .

Preferably, as shown in FIGS. 7 and 9 , an upper connecting beam 10b is arranged between two adjacent first strip-shaped sound beam members 10a, and the upper connecting beam 10b spans the first grooves 12, 10a and 10a. Above the second groove 13 , the upper sound beam assembly 10 is formed in a well-shaped shape; and each of the upper connecting beams 10 b is located in the central area of the lower surface of the panel 8 . The four upper connecting beams 10b form a "mouth"-shaped reinforcing structure, which can further strengthen the bass region in the center of the panel 8, so as to further improve the sound quality of the dulcimer bass region.

Preferably, as shown in Figures 11 and 13, a lower connecting beam 11b is provided between two adjacent second strip-shaped sound beam members 11a, and the lower connecting beam 11b spans the third groove 15, the Above the fourth groove 16 , the lower sound beam assembly 11 is formed in a well-shaped shape; and each of the lower connecting beams 11 b is located in the central area of the upper surface of the bottom plate 9 . A "mouth"-shaped reinforcing structure is formed by four lower connecting beams 11b, which further strengthens the bass region in the center of the bottom plate 9, so as to further improve the sound quality of the dulcimer bass region.

Preferably, the upper bracing assembly 10 and the lower bracing assembly 11 are aligned in the height direction of the resonance box. The thickness of the inner end of the upper sound beam assembly 10 and the thickness of the lower sound beam assembly 11 is greater than that of the outer end. With this design, the central regions of the panel 8 and the bottom plate 9 can be reinforced.

Preferably, a plurality of upper radiating sound beams 17 are respectively provided in each of the upper resonance regions 8a of the panel 8, and the upper radiating sound beams 17 in the same upper resonance region 8a are arranged in parallel, and at least one of the upper radiating sound beams 17 is arranged in parallel. One end of the sound beam 17 faces the geometric center of the panel 8;

Each of the lower resonance regions 9a of the bottom plate 9 is respectively provided with a plurality of lower radiating sound beams 19, the lower radiating sound beams 19 in the same lower resonance region 9a are arranged in parallel, and at least one of the lower radiating sound beams 19 One end faces the geometric center of the bottom plate 9 . The thickness of the inner end of the upper radiating sound beam 17 and the lower radiating sound beam 19 is larger than the thickness of the outer end, which can strengthen the central regions of the panel 8 and the bottom plate 9 respectively.

Preferably, it also includes several joists 20, each of which is vertically arranged, and has an upper support foot 20a and a lower support foot 20b to strengthen the overall structure of the dulcimer; the upper support foot 20a supports the positioning In the first groove 12 or the second groove 13 on the lower surface of the panel 8, the lower support pin 20b is supported and positioned in the third groove 15 or the fourth groove 16 on the upper surface of the bottom plate 9, Moreover, the width of the upper support leg 20 a is smaller than the width of the first groove 12 and the second groove 13 , and the width of the lower support leg 20 b is smaller than the width of the third groove 15 and the fourth groove 16 .

Among them, a circular hole 18 (wind eye) is opened on the joist 20 , so that the resonated sound waves are convected in the resonance box and then transmitted through the sound outlet hole 14 .

Wherein, the upper support leg 20a is in the shape of a slender strip, and its length direction corresponds to the length direction of the first groove 12 or the second groove 13, so as to avoid interference to the sound tunnel; The support legs 20b are elongated strips, and their length direction corresponds to the length direction of the third groove 15 or the fourth groove 16, so as to avoid interference to the sound tunnel.

The bottom plate 9 is provided with a plurality of sound holes 14, and each sound hole 14 is located in the third groove 15, the fourth groove 16, and the third groove 15 and the third groove 14 respectively. The intersection of the four trenches 16 .

Preferably, the panel 8 and the bottom panel 9 include a peripheral high-pitched area, a mid-range mid-range and a central low-pitched area from the sound frequency range; wherein, the wall thicknesses of the panel 8 and the bottom panel 9 are determined by It gradually thickens from the outside to the inside, and the wall thickness of the bass area is larger than that of the midrange area, and the wall thickness of the midrange area is greater than that of the treble area. With this design, by arranging the thicker bass region near the center, the low-frequency vibration with lower frequency and larger amplitude can be made to emit a richer and more rounded bass in the bass region of the panel 8 and the bottom plate 9; The thinner treble area is set away from the center, so that the high-frequency vibration with higher frequency and smaller amplitude can emit more transparent and bright treble in the treble area of the panel 8 and the bottom plate 9 . Both the upper bracing assembly 10 and the lower bracing assembly 11 are located in the bass region, which can further increase the load in the middle area of the panel 8 and the bottom panel 9 .

Preferably, each of the grooves is an arc-shaped groove, which can minimize the sudden change in thickness of the panel 8 and the bottom plate 9 and avoid affecting the resonance and vibration of the panel 8 and the bottom plate 9 .

The lengths of the first grooves 12 and the second grooves 13 are both smaller than the width of the panel 8 ; the lengths of the third grooves 15 and the fourth grooves 16 are both smaller than those of the bottom plate 9 . Width; a smooth transition surface is provided between the outer ends of the first groove 12 and the second groove 13 and the lower surface of the panel 8, so that the vibration is transmitted to the periphery of the panel 8 more evenly. A smooth transition surface is provided between the outer ends of the third groove 15 and the fourth groove 16 and the upper surface of the bottom plate 9 , so that the vibration can be transmitted to the circumference of the bottom plate 9 more evenly.

The following descriptions are made for other implementations of the present invention and structural changes:

1. In the above embodiment, the dulcimer shown in the figure is only used for illustration, and its structure is not used to limit the scope of protection of the present invention. within the scope of protection.

2. In the above embodiment, the number of the upper sound beam assembly 10 and the lower sound beam assembly 11 is not limited to one group, and can also be multiple groups of parallel or other groups that help to strengthen the load in the middle of the panel 8 and the bottom plate 9. design, which is easily understood and accepted by those skilled in the art.

3. In the above embodiment, the first strip-shaped sound beam member 10a or the second strip-shaped sound beam member 11a can be straight strips as shown in the figure, two by 90 degrees combined, and arranged in pairs. on both sides of the groove.

Alternatively, the first strip-shaped bracing member 10a or the second strip-shaped bracing member 11a may also have an arc and include two straight sides, and the straight sides of two adjacent bracing members are arranged in pairs on the both sides of the groove.

4. In the above embodiment, the first groove 12 , the second groove 13 , the third groove 15 and the fourth groove 16 are arc grooves. However, the present invention is not limited to this, and the grooves can be designed into other shapes, such as concave structures such as V-shape, U-shape, and W-shape. This is easily understood and accepted by those skilled in the art.

5. In the above embodiment, viewed from the cross section of the resonance box, the upper bracing assembly 10 and the lower bracing assembly 11 are arranged correspondingly in the up-down direction (see FIG. 3 ). However, the present invention is not limited to this, and the arrangement may not be aligned, which may be determined according to the tuning of the sound and sound quality of the sound box. This is easily understood and accepted by those skilled in the art.

6. In the above embodiment, the shape and size of the upper bracing assembly 10 and the lower bracing assembly 11 are the same. However, the present invention is not limited to this, and the shape and size of the upper bracing assembly 10 and the lower bracing assembly 11 may also be different. The specific can be determined according to the sound box debugging tone and sound quality. This is easily understood and accepted by those skilled in the art.

Aiming at the problem that the high-pitched region of the dulcimer is not bright enough, and the low-pitched region is not rich and round enough, the present invention conducts an in-depth discussion and research on the design and sounding mechanism of the dulcimer, and finds out that the timbre of the existing dulcimer in the high-pitched region and the low-pitched region is not good. The main reason is due to unreasonable panel design. Accordingly, the inventor broke the shackles of the composition design of the dulcimer in the past, and boldly proposed an improved design scheme of the present invention. This improved design scheme changes the panel from the previous free vibration mode to the current standard vibration mode, from vibration, resonance, The sounding angle solves the problem that the high-pitched area of the dulcimer is not bright enough, and the low-pitched area is not rich and round enough. Practice has proved that the improved design scheme has outstanding substantive characteristics and significant technical progress, and has obtained obvious technical effects.

The above-mentioned embodiments are only intended to illustrate the technical concept and characteristics of the present invention, and the purpose is to enable those who are familiar with the art to understand the content of the present invention and implement accordingly, and cannot limit the protection scope of the present invention by this. All equivalent changes or modifications made according to the spirit of the present invention should be included within the protection scope of the present invention.

Claims (10)

1. The utility model provides a take full frequency channel high tone quality dulcimer of sound roof beam and sound tunnel which characterized in that:

comprises a resonance box, wherein the resonance box comprises a panel (8) and a bottom plate (9);

a first groove (12) and a second groove (13) are formed in the lower surface of the panel (8), the first groove (12) and the second groove (13) are crossed on the lower surface of the panel (8) and are communicated with each other, the cross points are located in the center of the panel (8), and then the lower surface of the panel (8) is divided into four upper resonance areas (8 a) in equal parts;

an upper sound beam assembly (10) is fixedly arranged in the middle of the lower surface of the panel (8), the upper sound beam assembly (10) comprises a plurality of first strip-shaped sound beam components (10 a), and the first strip-shaped sound beam components (10 a) are arranged on two sides of the first groove (12) and two sides of the second groove (13) in pairs;

the first groove (12) and the second groove (13) form an upper transverse sound tunnel and an upper longitudinal sound tunnel on the lower surface of the panel (8) respectively.

2. The dulcimer of claim 1, wherein: a third groove (15) and a fourth groove (16) are formed in the upper surface of the bottom plate (9), the third groove (15) and the fourth groove (16) are crossed and communicated with each other on the upper surface of the bottom plate (9), the crossed points are located in the center of the bottom plate (9), and the upper surface of the bottom plate (9) is further divided into four lower resonance areas (9 a) in equal parts;

a lower sound beam assembly (11) is fixedly arranged in the middle of the upper surface of the bottom plate (9), the lower sound beam assembly (11) comprises a plurality of second strip-shaped sound beam components (11 a), and the second strip-shaped sound beam components (11 a) are arranged on two sides of the third groove (15) and two sides of the fourth groove (16) in pairs;

the third groove (15) and the fourth groove (16) form a lower transverse sound tunnel and a lower longitudinal sound tunnel on the upper surface of the bottom plate (9) respectively.

3. The dulcimer of claim 1, wherein: an upper connecting beam (10 b) is arranged between every two adjacent first strip-shaped sound beam components (10 a), and the upper connecting beam (10 b) stretches across the upper parts of the first groove (12) and the second groove (13) to form a well-shaped upper sound beam assembly (10); and each upper connecting beam (10 b) is positioned in the central area of the lower surface of the panel (8).

4. The dulcimer of claim 2, wherein: a lower connecting beam (11 b) is arranged between every two adjacent second strip-shaped sound beam components (11 a), and the lower connecting beam (11 b) spans over the third groove (15) and the fourth groove (16) to form a lower sound beam assembly (11) in a groined shape; and each of the lower connecting beams (11 b) is located in a central region of the upper surface of the bottom plate (9).

5. The dulcimer of claim 1, wherein: the panel (8) is divided into a peripheral high-pitch area, a middle-pitch area and a central low-pitch area from the pronunciation frequency band;

the wall thickness of the panel (8) is gradually increased from outside to inside, the wall thickness of a low-sound area is larger than that of a middle-sound area, and the wall thickness of the middle-sound area is larger than that of a high-sound area;

the upper sound beam assembly (10) is located in a bass region of the panel (8).

6. The dulcimer of claim 2, wherein: the bottom plate (9) is divided into a peripheral high-pitch area, a middle-pitch area and a central low-pitch area from the pronunciation frequency band;

the wall thickness of the bottom plate (9) is gradually increased from outside to inside, the wall thickness of a low-sound area is larger than that of a middle-sound area, and the wall thickness of the middle-sound area is larger than that of a high-sound area;

the bass beam assembly (11) is located in a bass region of the bottom plate (9).

7. The dulcimer of claim 2, wherein: the upper sound beam assembly (10) and the lower sound beam assembly (11) are arranged in a contraposition mode in the height direction of the resonance box.

8. The dulcimer of claim 2, wherein: the device also comprises a plurality of joists (20), wherein each joist (20) is vertically arranged and is provided with an upper supporting foot (20 a) and a lower supporting foot (20 b);

the upper supporting feet (20 a) are supported and positioned in a first groove (12) or a second groove (13) on the lower surface of the panel (8), the lower supporting feet (20 b) are supported and positioned in a third groove (15) or a fourth groove (16) on the upper surface of the bottom plate (9), the width of the upper supporting feet (20 a) is smaller than that of the first groove (12) and the second groove (13), and the width of the lower supporting feet (20 b) is smaller than that of the third groove (15) and the fourth groove (16).

9. The dulcimer of claim 8, wherein: the upper supporting leg (20 a) is in a slender strip shape, and the length direction of the upper supporting leg corresponds to the length direction of the first groove (12) or the second groove (13);

the lower supporting leg (20 b) is in a shape of a long and thin strip, and the length direction of the lower supporting leg corresponds to the length direction of the third groove (15) or the fourth groove (16).

10. The dulcimer of claim 2, wherein: a plurality of sound emitting holes (14) are formed in the bottom plate (9), and each sound emitting hole (14) is located in the third groove (15), the fourth groove (16) and the junction of the third groove (15) and the fourth groove (16).

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