Sound cavity structure for reducing low-frequency trap and resonance THD of surface sound source

Abstract

The invention discloses a sound cavity structure for reducing low-frequency trap and resonance THD of an area sound source, which comprises an inner metasurface crystal layer, a driving layer and a conduction structure which are sequentially arranged from bottom to top, the driving layer comprises a sound production component and a pneumatic connecting layer, one side of the pneumatic connecting layer is fixedly connected with the sound production component, the other side of the pneumatic connecting layer is fixedly connected with the inner metasurface crystal layer, an upper pressure-sensitive adhesive layer is arranged between the pneumatic connecting layer and the sound production component, and a lower pressure-sensitive adhesive layer is arranged between the upper pressure-sensitive adhesive layer and the lower pressure-sensitive adhesive layer. And a lower pressure-sensitive adhesive layer is arranged between the pneumatic connecting layer and the inner metasurface crystal layer. The acoustic wave sensor has the advantage of solving the problems of low-frequency traps, standing waves and resonance caused by the increase of sound pressure.

Description

Technical Field

[0001] The invention relates to the technical field of music glass structures, and in particular to a sound cavity structure capable of reducing low-frequency traps and resonance THD of surface sound sources. Background Art

[0002] Music glass is a new type of professional audio product. It can be integrated on any glass of the car, providing customers with a large area, high directivity, high reliability, reduced tuning difficulty, and a listening experience from top to bottom, from left to right, and from front to back. In the future, it will definitely replace car audio, and achieve the purpose of thinning, weight reduction, power consumption reduction, new sound source experience, and new technology shock. However, because the overall thickness of the sunroof, front windshield, etc. of the car glass is relatively large, and it is a laminated structure. The new super-surface microstructure nano-cavity technology used by music glass has greatly improved the FR performance, but the THD in the mid-frequency band is controlled at about 25%-50%, which is easy to cause signal instability and glass resonance noise.

[0003] The present application provides a sound cavity structure for reducing low-frequency traps and resonance THD of surface sound sources to solve the above problems. Summary of the invention

[0004] The technical problem to be solved by the present invention is that the existing automobile glass such as the sunroof and the front windshield has a large overall thickness and is in a laminated structure. The new super-surface microstructure nano-cavity technology used in the music glass has greatly improved the FR performance, but the THD in the mid-frequency band is controlled at about 25%-50%, which is easy to cause signal instability and glass resonance noise. Therefore, a sound cavity structure for reducing the low-frequency trap and resonant THD of the surface sound source is provided. The sound cavity structure for reducing the low-frequency trap and resonant THD of the surface sound source includes: An inner super surface crystal layer, a driving layer and a conductive structure, wherein the inner super surface crystal layer, the driving layer and the conductive structure are arranged in sequence from bottom to top; The driving layer includes a sound-emitting component and a pneumatic connection layer, one side of the pneumatic connection layer is fixedly connected to the sound-emitting component, and the other side of the pneumatic connection layer is fixedly connected to the inner supersurface crystal layer, an upper pressure-sensitive adhesive layer is arranged between the pneumatic connection layer and the sound-emitting component, and a lower pressure-sensitive adhesive layer is arranged between the pneumatic connection layer and the inner supersurface crystal layer.

[0005] Furthermore, the sound-generating component includes a linear motor, piezoelectric ceramics and an actuator. The linear motor is fixedly connected to the pneumatic connection layer through an upper pressure-sensitive adhesive layer. The sound-generating component is used to provide a sound source to apply power to the inner metasurface crystal layer.

[0006] Furthermore, the pneumatic connection layer includes an outer nanocavity structure and an inner nanocavity structure, and the outer nanocavity structure is arranged outside the inner nanocavity structure.

[0007] Furthermore, the interior of the outer nanocavity structure is a 35° nanocircular hole, which is stacked in a dense shape and has nanoholes on both sides. The width of the outer nanocavity structure is less than 3 mm, and the edge of the outer nanocavity structure is designed to be "C"-shaped, and forms an arc R angle state with the inner supersurface crystal layer.

[0008] Furthermore, the inner nano-cavity structure is made into a 40° nano-circular hole inside, which is stacked in a dense shape, and has nano-holes on both sides.

[0009] Furthermore, a plurality of sound cavity structures are arranged between the inner nano cavity structure and the outer nano cavity structure.

[0010] Furthermore, a driving mechanism is also arranged within the range surrounded by the outer nano-cavity structure, and the outer nano-cavity structure directly in front of the lead wire of the driving mechanism is in a symmetrical long strip shape.

[0011] Furthermore, the conductive structure is a micron-porous material layer.

[0012] The implementation of the present invention has the following beneficial effects: 1. The present invention provides a sound cavity structure for reducing low-frequency traps and resonance THD of surface sound sources, which can be widely used in rail transit car sunroofs, windshields and other glass, as an overall technical solution. It effectively solves the low-frequency traps, standing waves and resonance problems caused by the increase of sound pressure in the surface sound field of music glass, making the sound quality of surface sound sources better restored and pleasant to the ears. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 It is a structural diagram of the present invention; Figure 3 It is a schematic diagram of the structure of the outer nano cavity of the present invention; Figure 4 This is a schematic diagram of the inner nanocavity structure of the present invention; Figure 5 It is a schematic diagram of the sound cavity structure of the present invention.

[0014] The corresponding figure numbers should be: 1-inner supersurface crystal layer, 2-driving layer, 201-pneumatic connection layer, 2011-external nanocavity structure, 2012-sound cavity structure, 2013-inner nanocavity structure, 202-sound-generating components, 203-upper pressure-sensitive adhesive layer, 204-lower pressure-sensitive adhesive layer, 205-wire, 206-driving mechanism and 3-conduction structure. DETAILED DESCRIPTION

[0015] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Example

[0016] Please refer to the instruction manual Figure 1-4 This embodiment provides a sound cavity structure for reducing low-frequency traps and resonant THD of surface sound sources. The sound cavity structure for reducing low-frequency traps and resonant THD of surface sound sources includes: The inner super surface crystal layer 1, the driving layer 2 and the conductive structure 3 are arranged in sequence from bottom to top; The inner metasurface crystal layer is a two-dimensional metacrystal material constructed by a series of planar artificial atoms in a specific arrangement. Its surface is smooth and flat, with good light transmittance and conductivity. Through the precise design of artificial atoms at different positions in the plane, the metasurface can have any electromagnetic wave reflection / transmission phase distribution, thereby achieving free and efficient control of the electromagnetic wave front, ensuring stable and reliable sound wave transmission with low loss; in addition, compared with traditional three-dimensional metamaterials, the metasurface crystal layer has the advantages of good light projection, low loss, easy integration, and simple preparation process.

[0017] The driving layer 2 includes a sound-emitting component 202 and a pneumatic connection layer 201, one side of the pneumatic connection layer 201 is fixedly connected to the sound-emitting component 202, and the other side of the pneumatic connection layer 201 is fixedly connected to the inner supersurface crystal layer 1, an upper pressure-sensitive adhesive layer 203 is arranged between the pneumatic connection layer 201 and the sound-emitting component 202, and a lower pressure-sensitive adhesive layer 204 is arranged between the pneumatic connection layer 201 and the inner supersurface crystal layer 1.

[0018] The sound-generating component 202 includes a linear motor, piezoelectric ceramics and an actuator. The linear motor is fixedly connected to the pneumatic connection layer 201 through the upper pressure-sensitive adhesive layer 203. The sound-generating component 202 is used to provide a sound source and exert power on the inner metasurface crystal layer 1.

[0019] The pneumatic connection layer 201 includes an outer nanocavity structure 2011 and an inner nanocavity structure 2013 , and the outer nanocavity structure 2011 is arranged outside the inner nanocavity structure 2013 .

[0020] The driving layer refers to the sound-generating components in the form of surface sound generation and the pneumatic connection layer. Its main sound-generating components include at least: linear motors, piezoelectric ceramics, exciters, etc. The sound-generating components provide the sound source and directly exert power on the inner supersurface crystal layer, which is equivalent to the diaphragm medium.

[0021] The pneumatic connection layer refers to a new type of nano-material that is stacked at a certain angle. A layer of pressure-sensitive adhesive is coated on its upper and lower surfaces, one side is directly in contact with the motor, and the other side is directly in contact with the inner surface crystal layer. The nano-pores formed by stacking at a certain angle optimize the force transmission of the drive device. It is also the most important buffer layer between the vibration force generated by the power unit and the inner surface crystal layer, which plays a role in buffering, reducing the amplitude, and fixing. The main materials of the pneumatic connection layer include at least: double-sided adhesive EVA, PE, CR, PU foam, PORON, velvet paper, composite pearl cotton, EPP, etc., but not limited to solid vibration-damping materials such as rubber, silicone, and air cushions.

[0022] The interior of the outer nanocavity structure 2011 is a 35° nanocircular hole, which is densely stacked and has nanoholes on both sides. The width of the outer nanocavity structure 2011 is less than 3 mm. The edge of the outer nanocavity structure 2011 is designed to be "C"-shaped and forms an arc R angle with the inner supersurface crystal layer 1.

[0023] A driving mechanism 206 is also disposed within the range surrounded by the outer nano-cavity structure 2011 , and the outer nano-cavity structure 2011 directly in front of the lead wires of the driving mechanism 206 is in a symmetrical long strip shape.

[0024] The outer nanocavity structure refers to a silica gel material with fine and uniform pore size. According to the amplitude strength, a structure is designed at the edge of the inner super surface crystal layer to solve the problem of acoustic standing wave (such as Figure 3 ). Its interior is made into a 35° nano-circular hole shape, which is stacked in a dense shape, and the two sides are in the form of nano-holes, which can ensure that the air passes through the gaps of the nano-circular holes from the outer nano-cavity layer, and more regularly passes through the cavity processing holes of the outer nano-cavity structure into the hollow and sound cavity, and is also convenient for discharge from the other side. Secondly, the width of the outer nano-cavity structure is relatively thin (<3mm), which is more conducive to air flow and weight reduction, and will not increase the damping coefficient, thereby reducing performance.

[0025] The edge of the outer nanocavity structure is designed to be "C" shaped, and forms an arc R angle with the inner super surface crystal layer. Directly in front of the drive layer lead, the outer nanocavity structure is used to design a symmetrical long strip shape in the center, and the leads of the components are derived from the outer nanocavity structure at the center point. The gaps between the components are in the same position, and the outer nanocavity structure facing each component has the same size and structure to form an array. No design is done on the opposite side of the drive layer lead.

[0026] The inner nano cavity structure 2013 is made into a 40° nano circular hole shape, which is stacked in a dense shape, and has nano holes on both sides.

[0027] A plurality of sound cavity structures 2012 are arranged between the inner nano cavity structure 2013 and the outer nano cavity structure.

[0028] The inner nano-cavity structure refers to a silicone material with a higher specific gravity, fine and uniform pore size. A sealed cavity structure is designed at the gap and tail of the outer nano-cavity structure to enhance the sound pressure of the internal cavity and improve the SPL. The interior is made into a 40° nano-circular hole, which is stacked in a dense shape, and the two sides are in the form of nano-pores. It is larger than the nano-pore diameter of the outer nano-cavity, and the width is generally more than twice that of the outer nano-cavity structure. The size is defined by the size of the gap between the two outer nano-cavity structures. The design requirements are larger than the gap and the internal structure cannot be seen from the outside. A small gap is left between the inner and outer nano-structures for the flow of air.

[0029] Secondly, above and below the outer nanocavity layer is a new type of pressure-sensitive adhesive system that directly connects the inner and outer supersurface crystal layers together to form a sealed cavity.

[0030] The inner and outer nanocavities are based on the up and down flow state of the air flow, which is a new dynamic cavity design that enhances the air compression inside the cavity. When working, the outer nanocavity structure and the ultra-thin ultra-surface module in contact exert a driving force on the cavity, and the airflow quickly enters the sound cavity from the outside based on the gaps inside and outside. The inner nanocavity structure will keep the airflow in the cavity sufficient. The airflow in the sound cavity is based on the up and down design, and the gas enters from the upper side and is discharged from the lower side.

[0031] In addition, the inner nanocavity layer has a high density, which ensures that the gas in the internal cavity is not easy to disperse, increases the gas compression in the internal cavity, ensures that the amplitude of the low frequency is increased, and improves the low frequency and sensitivity.

[0032] The conductive structure 3 is a micron-porous material layer.

[0033] The sound cavity structure uses acoustic guide materials, which can be multiple or one, combined with the nano cavity structure to perform superconducting transmission and energy conversion of the sound wave signals of the two. Not only does it increase the air flow inside and outside the cavity, but it also buffers and releases the force, reduces THD, and improves the SPL value.

[0034] First, the acoustic guide material is defined according to the length of the outer nanocavity structure with a "C" shape at the edge (the size is smaller than the length of the "C" type nanocavity structure). Then, by verifying the gap between the "C" type outer nanocavity and the first driving device, the cavity design is completed in the center and symmetry. Note: The nanocavity structure is placed on the acoustic guide material in a symmetrical manner, and the size of the nanocavity structure on the acoustic guide material is slightly longer than the acoustic guide material.

[0035] The higher the frequency, the smaller the size of the single cavity. The lower the frequency, the larger the size of the single cavity. Therefore, when designing, a smaller cavity area is used to divide the inner cavity into several small areas, which not only increases the strength of the cavity and reduces deformation, but also prevents crosstalk between circuits and improves noise problems.

[0036] The conductive structure refers to a layer of micron-porous material that is sensitive to pressure. It acts directly on the driving layer and bonds the outer supersurface crystal layer to the driving layer. It mainly serves the purpose of buffering, reducing vibration and increasing amplitude.

[0037] The conductive structure has excellent adaptability to a wide temperature range; excellent electrical properties and good leakage resistance; uniform water resistance, temperature resistance and weather resistance, and can bond a variety of difficult-to-bond low surface energy materials.

[0038] The outer supersurface crystal layer is a two-dimensional superstructure crystal material constructed by a series of planar artificial atoms in a specific arrangement. Its surface is smooth and flat, with good light transmittance and conductivity. Its structure is consistent with the inner supersurface crystal layer and is used as a sound cavity cover.

[0039] In the description of the present invention, it is necessary to understand that the terms "coaxial", "bottom", "one end", "top", "middle", "the other end", "upper", "one side", "top", "inside", "front", "center", "both ends" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0040] In the present invention, unless otherwise clearly stipulated and limited, the terms such as "installation", "setting", "connection", "fixation" and "screw-on" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. Unless otherwise clearly defined, ordinary technicians in this field can understand the specific meanings of the above terms in the present invention according to the specific circumstances.

[0041] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A sound cavity structure for reducing low-frequency traps and resonance THD of surface sound sources, characterized in that: It includes an inner super surface crystal layer, a driving layer and a conductive structure, wherein the inner super surface crystal layer, the driving layer and the conductive structure are arranged in sequence from bottom to top; The driving layer includes a sound-emitting component and a pneumatic connection layer, one side of the pneumatic connection layer is fixedly connected to the sound-emitting component, and the other side of the pneumatic connection layer is fixedly connected to the inner supersurface crystal layer, an upper pressure-sensitive adhesive layer is arranged between the pneumatic connection layer and the sound-emitting component, and a lower pressure-sensitive adhesive layer is arranged between the pneumatic connection layer and the inner supersurface crystal layer.

2. The sound cavity structure for reducing low-frequency trap and resonance THD of surface sound source according to claim 1, characterized in that: The sound-generating component comprises a linear motor, piezoelectric ceramics and an actuator. The linear motor is fixedly connected to the pneumatic connection layer via an upper pressure-sensitive adhesive layer. The sound-generating component is used to provide a sound source and exert power on the inner metasurface crystal layer.

3. The sound cavity structure for reducing low-frequency trap and resonance THD of surface sound source according to claim 2, characterized in that: The pneumatic connection layer comprises an outer nanocavity structure and an inner nanocavity structure, wherein the outer nanocavity structure is arranged outside the inner nanocavity structure.

4. The sound cavity structure for reducing low-frequency trap and resonance THD of surface sound source according to claim 3, characterized in that: The interior of the outer nanocavity structure is a 35° nanocircular hole, which is stacked in a dense shape and has nanoholes on both sides. The width of the outer nanocavity structure is less than 3 mm. The edge of the outer nanocavity structure is designed to be "C"-shaped and forms an arc R angle with the inner supersurface crystal layer.

5. The sound cavity structure for reducing surface sound source low-frequency trap and resonance THD according to claim 4, characterized in that: The inner nano cavity structure is made into a 40° nano circular hole shape, which is stacked in a dense shape, and has nano holes on both sides.

6. The sound cavity structure for reducing low-frequency trap and resonance THD of surface sound source according to claim 5, characterized in that: A plurality of sound cavity structures are arranged between the inner nano cavity structure and the outer nano cavity structure.

7. The sound cavity structure for reducing surface sound source low-frequency trap and resonance THD according to claim 6, characterized in that: A driving mechanism is also arranged within the range surrounded by the outer nano-cavity structure, and the outer nano-cavity structure directly in front of the lead wire of the driving mechanism is in a symmetrical long strip shape.

8. The sound cavity structure for reducing surface sound source low-frequency trap and resonance THD according to claim 1, characterized in that: The conductive structure is a micron-porous material layer.

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