A composite resonant four-stringed instrument

Abstract

This utility model relates to the field of four-stringed instruments, specifically a composite resonant four-stringed instrument, comprising a body, a soundbox, a neck, and a headstock. One end of the neck is fixedly connected to the headstock, and the other end of the neck protrudes to form a connecting part that mates with one side of the soundbox. Both the neck and the soundbox are hollow structures. The surface of the neck is provided with frets arranged from bottom to top with progressively increasing spacing. The soundbox has a reinforcing beam inside. The beneficial effects are: the hollow neck and the soundbox form a composite resonant cavity, significantly enhancing low-frequency depth and mid-frequency fullness; the I-beam reinforcing beam suppresses body deformation and stabilizes low-frequency response; the figure-eight amplifying beam directionally transmits mid-to-high frequency vibrations, improving tone brightness and soundstage openness; the side wall tone holes optimize the sound wave radiation phase, enhancing the stereo effect; the hollow connecting part disperses neck torque, reducing the risk of tenon joint cracking; the misaligned tuning peg design balances the stress in the peg holes, extending the headstock's lifespan.

Description

Technical Field

[0001] This utility model relates to the field of four-stringed instrument technology, specifically a composite resonant four-stringed instrument. Background Technology

[0002] Four-stringed instruments hold a place in the world of music. Besides the well-known ukulele, there are also classic representatives such as the pipa, ruan, and yueqin.

[0003] Traditional four-stringed instruments have the following technical limitations: low acoustic transmission efficiency; the vibration transmission between the solid neck and the soundbox is disconnected, resulting in significant attenuation of mid-to-high frequencies and insufficient low-frequency resonance; the joint between the neck and the soundbox is prone to cracking due to string tension; changes in temperature and humidity can easily cause deformation of the soundboard, leading to pitch deviation; equidistant frets are prone to mis-touch when played in high positions; the parallel arrangement of the tuning pins in the headstock causes stress concentration, affecting tuning stability.

[0004] Existing improvement schemes mostly focus on local reinforcement and fail to systematically solve the problem of acoustic and structural synergistic optimization. Therefore, we propose a composite resonant four-stringed instrument to solve the above problems. Utility Model Content

[0005] In view of the problems existing in the prior art, this utility model discloses a composite resonant four-stringed instrument. The technical solution adopted is as follows: the instrument body includes a soundbox, a neck, and a headstock. One end of the neck is fixedly connected to the headstock, and the other end of the neck protrudes to form a connecting part that mates with one side of the soundbox. Both the neck and the soundbox are hollow structures. The surface of the neck is provided with frets arranged in an increasing spacing from bottom to top. The soundbox has a reinforcing beam inside. A sound hole is opened through one side of the upper outer wall of the soundbox. A slot is opened in the middle of the surface of the headstock. Four sets of axle holes are symmetrically opened on the left and right sides of the slot. The two ends of the headstock are staggered and spaced apart. The axle passes through the axle hole on one side and through the slot to mate with the axle hole on the other side at the same horizontal position for rotational installation. A panel is provided at the front end of the soundbox. A bridge is provided at the lower end of the panel. Strings are installed between the bridge and the four axle pins through string fixing pins.

[0006] As a preferred embodiment of this utility model, the back of the instrument neck is provided with a groove, the interior of the groove has a smooth arc-shaped inner wall structure, and the groove is a long strip-shaped groove.

[0007] As a preferred technical solution of this utility model, the reinforcing beam is a double-web I-shaped structure.

[0008] As a preferred embodiment of this utility model, an amplifying beam is installed below the resonance box, and the amplifying beam is arranged in a figure-eight shape.

[0009] As a preferred technical solution of this utility model, the surface of the bridge is provided with a slot for engaging and installing the nut, and the lower end of the bridge is provided with a positioning groove, and the side wall of the positioning groove is evenly provided with string holes for installing the strings.

[0010] The beneficial effects of this invention are as follows: The hollow neck and the soundbox form a composite resonance cavity, significantly enhancing the depth of low frequencies and the fullness of mid frequencies; the I-beam reinforcement suppresses deformation of the soundbox and stabilizes the low-frequency response; the figure-eight amplification beam directionally transmits mid-to-high frequency vibrations, improving tone brightness and the sense of soundstage openness; the side wall tone holes optimize the phase of sound wave radiation, enhancing the stereo effect of the sound; the hollow connection part disperses neck torque, reducing the risk of tenon joint cracking; the staggered tuning pin design balances the stress in the pin holes, extending the life of the headstock; the double-web I-beam significantly improves the bending stiffness of the soundboard and suppresses deformation due to temperature and humidity; the high-precision arrangement in the low positions improves the accuracy of chord pressing; the wide spacing in the high positions accommodates rapid fingering and reduces accidental touches; the arc-shaped groove on the back of the neck provides an ergonomic thumb support point, improving grip comfort and control; the staggered tuning pins shorten the tuning stroke and improve operating efficiency. Attached Figure Description

[0011] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0012] Figure 1 This is a first perspective view of the structure of this utility model;

[0013] Figure 2 This is a second perspective view of the structure of this utility model;

[0014] Figure 3 This is a front view of the structure of this utility model;

[0015] Figure 4 This utility model Figure 3 Schematic diagram of the AA section structure;

[0016] Figure 5 This is a schematic diagram of the internal structure of the resonance box of this utility model;

[0017] Figure 6 This is a partially enlarged structural diagram of section B of this utility model.

[0018] In the diagram: 1 Soundbox, 2 Neck, 3 Headstock, 4 Top, 5 Bridge, 6 Soundhole, 7 Fret, 8 Slot, 9 Peghole, 10 Tuning pin, 11 String, 12 Reinforcing beam, 13 Amplifying beam, 14 Positioning slot, 15 Nut, 16 String retaining pin. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] like Figures 1 to 6 As shown, this utility model discloses a composite resonant four-stringed instrument. The technical solution adopted is as follows: the instrument includes a body, which includes a soundbox 1, a neck 2, and a headstock 3. One end of the neck 2 is fixedly connected to the headstock 3, and the other end of the neck 2 protrudes to form a connecting part that is installed with one side of the soundbox 1. Both the neck 2 and the soundbox 1 are hollow structures. The surface of the neck 2 is provided with frets 7 arranged from bottom to top with increasing spacing. The soundbox 1 is provided with a reinforcing beam 12. A sound hole 6 is provided through one side of the upper end of the outer wall of the soundbox 1. A slot 8 is provided in the middle of the surface of the headstock 3. Four sets of shaft holes 9 are symmetrically provided on the left and right sides of the slot 8. The two ends of the headstock 3 are staggered and spaced apart, and the shaft 10 passes through the shaft hole 9 on one side and passes through the slot 8 to cooperate with the shaft hole 9 on the other side at the same horizontal position for rotational installation. A panel 4 is provided at the front end of the soundbox 1. A bridge 5 is provided at the lower end of the panel 4. The bridge 5 and the four shaft holes 10 are respectively connected by string fixing pins 16 to install strings 11.

[0021] By designing the neck 2 and the soundbox 1 as a hollow structure, not only is the low frequency enhanced, but a Helmholtz resonance cavity effect is also created, which can amplify specific frequencies, such as mid-range vocal accompaniment. The overall weight of the instrument is also significantly reduced, which has a direct impact on the comfort of the performer, especially reducing shoulder and neck strain during long standing performances. The increasing spacing of the frets 7 creates an anti-accidental touch effect. In fast string bending techniques, the wider spacing at higher positions provides more space for the fingers to swing and vibrato. In other words, the misaligned tuning pegs 10 not only disperse stress but also shorten the distance the hand moves when changing strings. By setting up the reinforcing beam 12, deformation caused by differences in the expansion coefficient of the wood is offset, and the internal humidity regulation capability is improved, which is very beneficial for the maintenance of expensive wood.

[0022] As a preferred technical solution of this utility model, the back of the neck 2 is provided with a groove. The inside of the groove has a smooth arc-shaped inner wall structure. The groove is a long strip-shaped groove, which can provide a stable thumb support point, improve grip comfort and control, and relieve hand fatigue.

[0023] As a preferred technical solution of this utility model, the reinforcing beam 12 is a double-web I-shaped structure, which can greatly enhance the rigidity of the enclosure, suppress deformation, improve pitch stability and low-frequency response clarity, and extend life.

[0024] As a preferred technical solution of this utility model, a sound amplification beam 13 is installed below the resonance box 1. The sound amplification beam 13 is arranged in a figure-eight shape, which can guide vibration in a directional manner, enhance the projection force and timbre brightness of the mid-high frequency range, and improve the sense of sound field openness and dynamic response.

[0025] As a preferred technical solution of this utility model, the surface of the bridge 5 is provided with a slot for engaging and installing the nut 15, and the lower end of the bridge 5 is provided with a positioning groove 14, and the side wall of the positioning groove 14 is evenly provided with string holes for installing the strings 11.

[0026] Components not described in detail in this article are existing technologies.

[0027] While the specific embodiments of this utility model have been described in detail above, this utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of this utility model. Modifications or variations that do not involve creative labor are still within the protection scope of this utility model.

Claims

1. A composite resonant four-stringed instrument, comprising a body, characterized in that, The instrument body includes a soundbox (1), a neck (2), and a headstock (3). One end of the neck (2) is fixedly connected to the headstock (3), and the other end of the neck (2) protrudes to form a connecting part that fits into one side of the soundbox (1). Both the neck (2) and the soundbox (1) are hollow structures. The surface of the neck (2) is provided with frets (7) arranged from bottom to top with increasing spacing. The soundbox (1) is provided with a reinforcing beam (12). A sound hole (6) is provided through one side of the upper end of the outer wall of the soundbox (1). The headstock (3) has... A slot (8) is provided in the middle of the surface. Four sets of shaft holes (9) are symmetrically provided on the left and right sides of the slot (8). The two ends of the headstock (3) are staggered and spaced with tuning pegs (10). The tuning pegs (10) pass through the shaft hole (9) on one side and through the slot (8) to cooperate with the shaft hole (9) on the other side at the same horizontal position for rotational installation. The front end of the resonator (1) is provided with a panel (4). The lower end of the panel (4) is provided with a bridge (5). The bridge (5) and the four tuning pegs (10) are respectively connected by string fixing pins (16) to install strings (11).

2. The composite resonant four-stringed instrument according to claim 1, characterized in that: The back of the neck (2) is provided with a groove, the inside of which is a smooth arc-shaped inner wall structure, and the groove is a long strip-shaped groove.

3. The composite resonant four-stringed instrument according to claim 2, characterized in that: The reinforcing beam (12) is a double-web I-shaped structure.

4. The composite resonant four-stringed instrument according to claim 3, characterized in that: A sound amplification beam (13) is installed below the resonance box (1), and the sound amplification beam (13) is arranged in a figure-eight shape.

5. The composite resonant four-stringed instrument according to claim 4, characterized in that: The surface of the bridge (5) is provided with a slot for engaging and installing the nut (15), and the lower end of the bridge (5) is provided with a positioning groove (14), and the side wall of the positioning groove (14) is evenly provided with string holes for installing the strings (11).

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