Coated string-free guitar and preparation method and system thereof

Abstract

The invention relates to the technical field of guitar string coating, and particularly discloses a coated string-free guitar and a preparation method thereof. A film-coated string-free guitar comprises a string-free guitar body, the string-free guitar body is provided with a silica gel touchpad, a push plate and an indicating lamp, the surface of the silica gel touchpad is covered with a transition layer, and the outer surface of the transition layer is covered with a vacuum film coating layer. The transition layer comprises the following components in parts by weight: 90-97 parts of magnesium oxide; 3-4 parts of rare earth yttrium; 1-2 parts of rare earth cerium; the preparation method comprises the following steps: (1) preparing touch silica gel for the silica gel touch panel, and sequentially sputtering and depositing a transition layer and a vacuum coating layer on the touch silica gel by adopting a vacuum coating technology to obtain coated touch silica gel; and (2) applying the film-coated touch silica gel to the silica gel touch panel, and assembling the film-coated touch silica gel, the push plate and the indicator lamp on the string-free guitar body to obtain the film-coated string-free guitar. The film-coated string-free gem provided by the invention has excellent stability in the application process.

Description

Technical Field

[0001] The present application relates to the technical field of stringless guitars, and more particularly, to a film-coated stringless guitar and a preparation method thereof. Background Art

[0002] The stringless guitar is an innovative instrument. Its core feature is that it doesn't require traditional guitar strings. Instead, it generates sound through the operation of keys, using a combination of high-precision sensors and smart chips. This design significantly lowers the barrier to entry for guitar learning, eliminating the hand pain associated with prolonged fingering practice and making music creation and enjoyment easier and more enjoyable.

[0003] The sound principle of a stringless guitar is that sensors generate high and low voltage levels to stimulate the built-in microcontroller. The signals generated by the microcontroller are then sent to the speakers through an amplifier circuit, producing sound. Specifically, a stringless guitar is equipped with sensors and a microcontroller. After the sensors detect the player's movements, they transmit signals to the microcontroller for processing. The microcontroller then converts these signals into audio signals, which are amplified by an amplifier and output by the speakers.

[0004] A stringless guitar usually consists of the following main parts: ‌Silicone touchpad and push pad‌: Stringless guitars do not have traditional strings. Instead, they have a row of silicone touchpads and push pads. These parts simulate the movements of the left hand pressing the strings and the right hand plucking the strings. Users can play music by touching and sliding these parts‌; ‌Guitar indicator light‌: Guitars are usually equipped with indicator lights on the side. The light points guide the keys, and the user can follow the instructions of the light points to play the guitar chord effect.‌ Electric guitar design elements: Some stringless guitars incorporate elements of electric guitar design, such as MIDI keyboard modules and sound systems. These designs allow stringless guitars to not only have the performance functions of traditional guitars, but also support more music creation and performance functions; Portable design: Some stringless guitars are designed to be very portable, such as Enya's Cyber-G stringless guitar, which has a detachable neck and a foldable body. The entire guitar weighs only about 2kg, making it suitable for use anytime, anywhere.

[0005] Regarding the above-mentioned related technologies, the inventor believes that the silicone touchpad of a stringless guitar is made of touch silicone. During the use of the stringless guitar, grease, dust, hand sweat and dead skin are easily accumulated on it, and it needs to be wiped and cleaned frequently and regularly. Therefore, the surface of the touch silicone is coated to improve its durability. However, the frequent vibrations generated after the player's fingers touch it often cause the coating layer to peel off easily, shortening the life of the coated stringless guitar.

[0006] Therefore, it is urgent to propose a solution to solve the above technical problems. Summary of the Invention

[0007] In order to improve the bonding stability of the coating layer on the touch-sensitive silicone surface of a coated stringless guitar during application, the present application provides a coated stringless guitar and a preparation method thereof.

[0008] In a first aspect, the present application provides a coated stringless guitar, which adopts the following technical solution: A coated stringless guitar, comprising a stringless guitar body, the stringless guitar body being provided with a silicone touch panel, a push pad, and an indicator light, the surface of the silicone touch panel being covered with a transition layer, and the outer surface of the transition layer being covered with a vacuum coating layer; The transition layer comprises the following components in parts by weight: 90-97 parts of magnesium oxide; 3-4 parts of rare earth yttrium; 1-2 parts of rare earth cerium.

[0009] By adopting the above-mentioned technical solution, a transition layer is provided beneath the vacuum-coated layer to improve the stability of the silicone touchpad during use, thereby effectively preventing the coating from shedding. The transition layer, primarily composed of magnesium oxide, can alleviate the stress generated by the performance coefficient mismatch between the vacuum-coated layer and the guitar string substrate. It also provides excellent stress regulation and buffering when the silicone touchpad vibrates frequently. Furthermore, the transition layer, primarily composed of magnesium oxide, facilitates nucleation of the vacuum-coated layer during its formation, building a tight and stable structure. This results in significantly superior bonding stability of the coating layer on the surface of the guitar string. At the same time, rare earth yttrium can enhance compressive strength and toughness, improve the stress regulation and buffering effect of the transition layer, and rare earth yttrium can further optimize the microstructure, so that a more stable bond is formed between the transition layer and the vacuum coating layer; the addition of rare earth cerium can refine the coating grains, help enhance the density and uniformity of the transition layer, and thus enable the corresponding effects brought by the transition layer to be stably and excellently exerted; through the combined use of rare earth cerium and rare earth yttrium and their action on the transition layer with magnesium oxide as the main component, they can play an excellent synergistic role with each other, so that the transition layer and the vacuum coating layer are tightly bonded, and can well resist the stress damage caused by high-frequency vibration of the silicone touch panel, thereby making the coating layer less likely to peel off, and the coated stringless guitar can also maintain excellent stability during use, and has an overall longer service life.

[0010] Preferably, the transition layer comprises the following components in parts by weight: 95 parts of magnesium oxide; 3.4 parts of rare earth yttrium; 1.6 parts of rare earth cerium.

[0011] By adopting the above technical solution, the transition layer composed of the above composition has a relatively excellent and stable effect during the application process. When the silicone touch panel vibrates frequently, the transition layer can ensure the bonding stability of the vacuum coating layer and firmly bond to the silicone touch panel, thereby allowing the coated stringless guitar to maintain better stability during the application process.

[0012] Preferably, the transition layer is obtained by magnetron sputtering process, and the vacuum degree during the process is 0.5×10 -3 Pa, RF power of 220-280 W, sputtering time of 10-15 min, and argon flow rate of 15-25 mL·min -1 .

[0013] By adopting the above technical solution and selecting the above vacuum degree, the transition layer can form a relatively uniform particle distribution during the deposition process; the selection of the above radio frequency power makes the transition layer structure less prone to defects and can form a stronger bond with the substrate; the selection of the above sputtering time can form a transition layer with better density and is less likely to agglomerate during the deposition and forming process of the transition layer; the selection of the above argon flow rate can obtain a more moderate sputtering speed, which is beneficial to avoid defects in the transition layer and ensure a relatively stable bond between the transition layer and the substrate; and the transition layer adopts the above magnetron sputtering process parameters, so that the quality of the formed transition layer is better, including the combination and coordination between the various component raw materials, which ultimately makes the application stability of the coated stringless guitar better.

[0014] Preferably, the thickness of the transition layer is 0.1-0.5 μm, and the thickness of the vacuum coating layer is 1-2 μm.

[0015] By adopting the above technical solution, thicker vacuum-deposited layers generally offer better wear and corrosion resistance, but this also results in higher costs and potential stress issues. Thinner vacuum-deposited layers may be more susceptible to mechanical damage, but are less expensive and less stressful. The aforementioned vacuum-deposited layer thicknesses meet the application requirements of coated stringless guitars. Furthermore, based on the aforementioned vacuum-deposited layer thicknesses, a corresponding transition layer thickness is selected, ensuring that the transition layer's corresponding effects also meet the requirements for stable application of coated stringless guitars.

[0016] Preferably, the material of the vacuum coating layer is any one of metal material, alloy material and ceramic material.

[0017] By adopting the above technical solutions, the vacuum coating layers of the above materials are all suitable for the application requirements of coated stringless guitars, and can improve the corrosion resistance, wear resistance, weather resistance and other performance, thereby extending the service life of the coated stringless guitars.

[0018] In a second aspect, the present application provides a method for preparing a coated stringless guitar, which adopts the following technical solution: A method for preparing a coated stringless guitar comprises the following steps: (1) Prepare touch silicone for silicone touch panel, and use vacuum coating technology to sputter-deposit a transition layer and a vacuum coating layer on the touch silicone in sequence to obtain coated touch silicone; (2) A coated touch silicone is applied to a silicone touch panel and assembled with a push plate and an indicator light on a stringless guitar body to obtain a coated stringless guitar.

[0019] By adopting the above technical solution, the above method is simple to operate, can stably combine the transition layer and the vacuum coating layer and exert excellent corresponding effects, thereby obtaining a high-quality coated stringless guitar, which is also suitable for large-scale industrial production as a whole.

[0020] Preferably, step (1) is specifically configured as follows: preparing touch silicone for the silicone touch panel, using vacuum coating technology to sputter-deposit a transition layer on the touch silicone, then performing crystal spraying on the surface of the transition layer, and then sputter-depositing a vacuum coating layer to obtain a coated touch silicone; Among them, the raw material used for crystal spraying is silicon carbide whisker powder.

[0021] By adopting the above-mentioned technical solution, silicon carbide whisker powder is sprayed onto the transition layer, partially embedding the silicon carbide whisker powder into the transition layer, creating an uneven surface structure on the transition layer and enhancing the interfacial bonding performance with the vacuum coating layer. Furthermore, the silicon carbide whisker powder protruding from the transition layer's surface can form relatively three-dimensional deposition sputtering points during the deposition and molding process of the vacuum coating layer, giving the resulting vacuum coating layer a more compact structure and a firm bond with the transition layer. Furthermore, when the silicone touchpad vibrates frequently, the silicon carbide whisker powder can also play an excellent role in stress conduction between the vacuum coating layer and the transition layer, enabling the transition layer to perform its functions more efficiently and effectively, thereby making the coating layer less susceptible to peeling and ultimately significantly improving the application stability of the coated stringless guitar.

[0022] Preferably, the particle size of the silicon carbide whisker powder is 50-150 nm.

[0023] By adopting the above technical solution, the silicon carbide whisker powder of the above particle size can be distributed more evenly during the application process and can exert excellent and stable application effects, thereby obtaining a coated stringless guitar with better application quality.

[0024] Preferably, the spraying amount of the silicon carbide whisker powder is 0.1-0.2 g / m 2 .

[0025] By adopting the above technical solution, if the spraying amount is lower than the above amount, the corresponding effect is limited, while if the spraying amount is higher than the above amount, the silicon carbide whisker powder will produce a large accumulation and cannot be evenly distributed, which will also lead to poor interface bonding between the vacuum coating layer and the transition layer; therefore, the silicon carbide whisker powder with the above spraying amount can exert excellent corresponding effects.

[0026] In a third aspect, the present application provides a coated stringless guitar system, which adopts the following technical solutions: A film-coated stringless guitar system comprises a simulated string-plucking module unit, a simulated string-pressing module unit, a data processing module unit and an audio output module unit which are loaded onto the film-coated stringless guitar.

[0027] By adopting the above technical solution, the simulated plucking module and the simulated string-pressing module are respectively connected to the data processing module, and the data processing module is connected to the audio output module; the simulated plucking module is used to display the pattern of the guitar fingerboard and receive the quality parameters of the string-pressing; the simulated string-pressing module is used to receive the position parameters and intensity parameters of the string-plucking; the data processing module is used to process the parameters to form sound information; the audio output module is used to comprehensively process the sound information and the stored fundamental tone source file to produce sound.

[0028] In summary, this application has the following beneficial effects: 1. This application provides a transition layer composed mainly of magnesium oxide and a combination of rare earth cerium and rare earth yttrium below the vacuum coating layer. This effectively protects the silicone touch panel from stress damage caused by high-frequency vibration and prevents the coating layer from falling off. Furthermore, the coated stringless guitar can maintain excellent stability during use and have a longer overall service life. 2. This application sprays silicon carbide whisker powder onto the transition layer, and can form relatively three-dimensional deposition sputtering points during the deposition and forming process of the vacuum coating layer, thereby enhancing the interface bonding performance between the transition layer and the vacuum coating layer, and bringing about excellent stress conduction, thereby significantly improving the application stability of the coated stringless guitar. DETAILED DESCRIPTION

[0029] The present application is further described in detail below with reference to the following examples and comparative examples.

[0030] Unless otherwise specified, the raw materials used in the examples and comparative examples of this application are commercially available: The high carbon steel core was purchased from T10A high carbon piano wire from Dongguan Junheng Metal Materials Co., Ltd. Nickel-plated phosphorus copper wire was purchased from Dongguan Xingxingshang Metal Materials Co., Ltd. c5191.

[0031] Example Example 1 A coated stringless guitar comprises a stringless guitar body, the stringless guitar body being provided with a silicone touch panel, a push panel, and an indicator light, a transition layer being covered on the surface of the silicone touch panel, and a vacuum coating layer being covered on the outer surface of the transition layer. The components of the transition layer and their corresponding weights are shown in Table 1. The coated stringless guitar is prepared by the following steps: (1) Prepare touch silicone for silicone touch panel, and use vacuum coating technology to sputter-deposit a transition layer and a vacuum coating layer on the touch silicone in sequence to obtain coated touch silicone; (2) A coated touch silicone is applied to a silicone touch panel and assembled with a push plate and an indicator light on a stringless guitar body to obtain a coated stringless guitar.

[0032] Note: In the above operation, the vacuum coating layer is a TiN material film layer; the vacuum coating layer is obtained by magnetron sputtering process, and the vacuum degree during the process is 5×10 -4 Pa, RF power of 100 W, sputtering time of 2 h, and argon flow rate of 30 mL min -1 The transition layer was obtained by magnetron sputtering process, and the vacuum degree during the process was 0.5×10 -3 Pa, RF power of 250 W, sputtering time of 12.5 min, and argon flow rate of 20 mL min -1 The thickness of the transition layer is 0.3μm, and the thickness of the vacuum coating layer is 1.5μm.

[0033] Examples 2-4 A coated stringless guitar is different from Example 1 in that the transition layer components and their corresponding weights are shown in Table 1.

[0034] Table 1 Transition layer components and their weight parts in Examples 1-4 (kg / part) raw material Example 1 Example 2 Example 3 Example 4 magnesium oxide 95 93.5 90 97 rare earth yttrium 3.4 3.5 3 4 Rare earth cerium 1.6 1.5 1 2 Example 5 A coated stringless guitar, which is different from Example 1 in that the transition layer is obtained by magnetron sputtering process, and the vacuum degree during the process is 0.5×10 -3 Pa, RF power 220 W, sputtering time 10 min, argon flow rate 15 mL min -1 .

[0035] Example 6 A coated stringless guitar, which is different from Example 1 in that the transition layer is obtained by magnetron sputtering process, and the vacuum degree during the process is 0.5×10 -3 Pa, RF power of 280 W, sputtering time of 15 min, and argon flow rate of 25 mL min -1 .

[0036] Example 7 A coated stringless guitar is different from Example 1 in that the thickness of the transition layer is 0.1 μm and the thickness of the vacuum coating layer is 1 μm.

[0037] Example 8 A coated stringless guitar is different from Example 1 in that the thickness of the transition layer is 0.5 μm and the thickness of the vacuum coating layer is 2 μm.

[0038] Example 9 A coated stringless guitar, which differs from Example 1 in that step (1) is specifically configured to prepare touch silicone for a silicone touch panel, adopt vacuum coating technology to sputter-deposit a transition layer on the touch silicone, then perform crystal spraying on the surface of the transition layer, control the crystal spraying distance to be between 10 cm and the crystal spraying speed to be controlled at 15 / min, and then sputter-deposit a vacuum coating layer to obtain a coated touch silicone; The raw material used for the crystal spraying treatment is silicon carbide whisker powder; the particle size of the silicon carbide whisker powder is 100nm; the spraying amount of the silicon carbide whisker powder is 0.15g / m 2 .

[0039] Example 10 A coated stringless guitar, which is different from Example 9 in that the particle size of the silicon carbide whisker powder is 50 nm.

[0040] Example 11 A coated stringless guitar is different from Example 9 in that the particle size of the silicon carbide whisker powder is 150 nm.

[0041] Example 12 A coated stringless guitar, which is different from Example 9 in that the spraying amount of silicon carbide whisker powder is 0.1g / m 2 .

[0042] Example 13 A coated stringless guitar, which differs from Example 9 in that the spraying amount of silicon carbide whisker powder is 0.2 g / m 2 .

[0043] Example 14 A coated stringless guitar system comprises a string-stirring simulation module unit, a string-pressing simulation module unit, a data processing module unit and an audio output module unit loaded onto any of the above-mentioned coated stringless guitars.

[0044] Comparative Example Comparative Example 1 A coated stringless guitar, which differs from Example 1 in that it is prepared by the following steps: (1) Prepare touch silicone for silicone touch panel, and use vacuum coating technology to sputter-deposit a vacuum coating layer on the touch silicone to obtain coated touch silicone; (2) A coated touch silicone is applied to a silicone touch panel and assembled with a push plate and an indicator light on a stringless guitar body to obtain a coated stringless guitar.

[0045] Comparative Example 2 A coated stringless guitar is different from Example 1 in that rare earth yttrium and rare earth cerium are not used in the components of the transition layer.

[0046] Comparative Example 3 A coated stringless guitar is different from Example 1 in that rare earth yttrium is not used in the composition of the transition layer.

[0047] Comparative Example 4 A film-coated stringless guitar is different from Example 1 in that rare earth cerium is not used in the components of the transition layer.

[0048] Performance testing Test samples: The film-coated stringless guitars obtained in Examples 1-13 were used as test samples 1-13, and the film-coated stringless guitars obtained in Comparative Examples 1-4 were used as control samples 1-4.

[0049] Test method: Prepare a tape that meets the requirements of "JIS Z 1522-2004 Pressure-sensitive transparent paper tape" and has an adhesive strength of 8N.

[0050] Take a coated stringless guitar and use a sharp blade to score the silicone touch panel. Score the lines only deep enough to penetrate the vacuum-coated layer, with a 0.1 mm distance between adjacent lines. After completing the vertical and horizontal cross-scribing, apply the aforementioned tape to the silicone touch panel, ensuring a tight fit without creating air bubbles. Then, peel off the tape and calculate the percentage of the adhered coating to the tape's bonded area. This value is recorded as A. A coated stringless guitar was used. Two sections of its silicone touch panel were fixed and then subjected to vibration at an amplitude of 25 mm and a frequency of 300 Hz for 3 consecutive days. Finally, a sharp blade was used to score the surface of the guitar using the same method as above. The score depth was such that the score only penetrated the vacuum coating layer, and the distance between adjacent scores was 0.1 mm. After completing the longitudinal and transverse cross-scribing, the aforementioned tape was applied to the surface of the silicone touch panel, ensuring a tight fit without generating bubbles. The tape was then peeled off, and the ratio of the adhered coating to the tape's adhesive area was calculated. This value is recorded as B. Finally, calculate the growth rate of stripping coating, which is (BA) / A. The greater the growth rate of stripping coating, the worse the application stability of the coating.

[0051] After completing the above tests on test samples 1-13 and control samples 1-4, the corresponding results are recorded in Table 2.

[0052] Table 2 Test results of test samples 1-13 and control samples 1-4 sample Growth rate of stripping coating (%) Test sample 1 8.93 Test sample 2 9.24 Test sample 3 9.15 Test sample 4 9.18 Test sample 5 9.07 Test sample 6 9.11 Test sample 7 9.21 Test sample 8 9.13 Test sample 9 3.17 Test sample 10 3.29 Test sample 11 3.24 Test sample 12 3.21 Test sample 13 3.27 Control sample 1 64.3 Control sample 2 28.7 Control sample 3 51.9 Control sample 4 48.2 Combining Examples 1-4 with Comparative Example 1 and Table 2, it can be seen that by providing a transition layer composed mainly of magnesium oxide and a combination of rare earth cerium and rare earth yttrium below the vacuum coating layer, the stability of the resulting silicone touch panel is greatly improved when subjected to frequent vibrations, and the growth rate of the coating peeling obtained in the above test is also significantly lower. When the weight of magnesium oxide, rare earth yttrium, and rare earth cerium in the transition layer are 95 parts by weight, 3.4 parts by weight, and 1.6 parts by weight, respectively, the corresponding effect brought by the transition layer is relatively excellent. Combining Comparative Examples 2-4 with Table 2, it can be seen that if rare earth cerium and rare earth yttrium are not used in the transition layer, the corresponding effect brought by the transition layer is greatly reduced. If only rare earth cerium or rare earth yttrium is used, although the growth rate of the coating peeling can be reduced in the test results, the reduction is extremely limited, and the sum of the effects brought by the use of the two alone is far less than the excellent combination of the two. Therefore, it can be seen that the combination of rare earth cerium and rare earth yttrium in the transition layer can bring about a significant improvement effect of 1+1>2.

[0053] Combining Example 1 and Example 5-6 with Table 2, it can be seen that the transition layer is obtained by magnetron sputtering process, and the vacuum degree during the process is 0.5×10 -3 Pa, RF power of 220-280 W, sputtering time of 10-15 min, and argon flow rate of 15-25 mL·min -1 , both can make the formed transition layer have better quality.

[0054] Combining Example 1 with Examples 7-8 and Table 2, it can be seen that a transition layer thickness of 0.1-0.5 μm and a vacuum coating layer thickness of 1-2 μm can meet the application requirements of the coated stringless guitar, and the transition layer and the vacuum coating layer can also exhibit a better bonding effect, thereby enabling the coated stringless guitar to be used more stably.

[0055] Combining Examples 1 and 9 with Table 2, it can be seen that by spraying silicon carbide whisker powder onto the transition layer, the present application enhances the interfacial bonding between the transition layer and the vacuum-coated film layer, and improves the silicone touch panel's ability to withstand internal stress damage caused by frequent vibration. This further reduces the growth rate of delamination of the coating layer as measured, significantly improving the stability of the coated stringless guitar. Combining Examples 10-14 with Table 2, it can be seen that silicon carbide whisker powder with a particle size of 50-150 nm can achieve excellent and stable application results, improving interfacial bonding between the vacuum-coated film layer and the transition layer, and providing excellent stress conduction, thereby ensuring the stability of the coated stringless guitar during use.

[0056] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed, but as long as they are within the scope of the claims of the present application, they are protected by the patent law.

Claims

1. A coated stringless guitar, characterized in that: The stringless guitar comprises a body, the body being provided with a silicone touch panel, a push panel, and an indicator light, the surface of the silicone touch panel being covered with a transition layer, and the outer surface of the transition layer being covered with a vacuum coating layer; The transition layer comprises the following components in parts by weight: 90-97 parts of magnesium oxide; 3-4 parts of rare earth yttrium; 1-2 parts of rare earth cerium.

2. The coated stringless guitar according to claim 1, characterized in that: The transition layer comprises the following components in parts by weight: 95 parts of magnesium oxide; 3.4 parts of rare earth yttrium; 1.6 parts of rare earth cerium.

3. The coated stringless guitar according to claim 1, characterized in that: The transition layer is obtained by magnetron sputtering process, and the vacuum degree during the process is 0.5×10 -3 Pa, RF power of 220-280 W, sputtering time of 10-15 min, and argon flow rate of 15-25 mL·min -1 .

4. The coated stringless guitar according to claim 1, characterized in that: The thickness of the transition layer is 0.1-0.5 μm, and the thickness of the vacuum coating layer is 1-2 μm.

5. The coated stringless guitar according to claim 1, characterized in that: The material of the vacuum coating layer is any one of metal material, alloy material and ceramic material.

6. The method for preparing a film-coated stringless guitar according to claim 1, wherein: The following steps are involved: (1) Prepare touch silicone for silicone touch panel, and use vacuum coating technology to sputter-deposit a transition layer and a vacuum coating layer on the touch silicone in sequence to obtain coated touch silicone; (2) A coated touch silicone is applied to a silicone touch panel and assembled with a push plate and an indicator light on a stringless guitar body to obtain a coated stringless guitar.

7. The method for preparing a film-coated stringless guitar according to claim 6, wherein: Step (1) is specifically configured as follows: preparing touch silicone for the silicone touch panel, using vacuum coating technology to sputter-deposit a transition layer on the touch silicone, then performing crystal spraying on the surface of the transition layer, and then sputter-depositing a vacuum coating layer to obtain a coated touch silicone; Among them, the raw material used for crystal spraying is silicon carbide whisker powder.

8. The method for preparing a film-coated stringless guitar according to claim 7, wherein: The particle size of the silicon carbide whisker powder is 50-150 nm.

9. The method for preparing a film-coated stringless guitar according to claim 7, wherein: The spraying amount of the silicon carbide whisker powder is 0.1-0.2g / m 2 .

10. A coated stringless guitar system, characterized in that: The invention comprises a string-stirring simulation module unit, a string-pressing simulation module unit, a data processing module unit and an audio output module unit which are loaded onto the film-coated stringless guitar according to any one of claims 1 to 5.