A passive back cavity wall based on a planar sound field

Abstract

The application discloses a passive back cavity wall based on a plane sound field, comprising a magnetic structure, a magnetic film and a pressure-sensitive adhesive layer; each magnetic structure is a ferrimagnetic magnetic structure, and a plurality of magnetic structures are spliced through the pressure-sensitive adhesive layer to form a U-shaped or H-shaped magnetic cavity structure matched with an active device; each magnetic cavity structure is arranged at a central position directly below the corresponding active device and is fixedly connected with the corresponding position of the lower surface of the plane material through the pressure-sensitive adhesive layer; a magnetic film matched with the magnetic cavity structure is arranged on the outer surface of each magnetic cavity structure; each magnetic film has magnetism, is preliminarily fixed through the magnetic attraction generated between the magnetic film and the corresponding magnetic cavity structure, and is used for adsorbing and sealing the corresponding magnetic cavity structure, so that the passive back cavity wall matched with the active device is formed. The application assists in increasing the low-frequency vibration amplitude and displacement through the induced magnetic field formed by the passive magnetic cavity structure, and improves the low frequency and high frequency.

Description

Technical Field

[0001] This invention relates to the field of planar sound source technology, and more specifically to a passive rear cavity wall based on a planar sound field. Background Technology

[0002] As living standards continue to improve, the demand for music quality is also increasing. Traditional loudspeakers are generally point and line sound sources, especially in current vehicle speaker systems, which use as many as 30 speakers. The sound field in this area composed of multiple points is actually achieved by increasing the number of loudspeakers, which is not very meaningful. This not only makes the tuning expensive, but also puts a heavy burden on the vehicle due to its high power consumption.

[0003] The advantages of surface sound sources are higher fidelity and reproduction, stronger spatial adaptability, and no need for special sound field processing. Furthermore, the sound is diffused, without obvious directionality, and the sound distribution is uniform. Sound is produced by vibration; high-frequency sound waves are short and have high attenuation. Due to their large coverage area, surface sound sources struggle to boost high frequencies. Low-frequency sounds have short wavelengths and vibrate more significantly; increasing voltage would increase power and amplitude, resulting in stronger displacement, which is not only environmentally unfriendly but also poses certain safety hazards. Therefore, these problems urgently need to be addressed. Summary of the Invention

[0004] The technical problem to be solved by this invention is to provide a passive rear cavity wall based on a planar sound field. Without changing the overall structure and power of the music glass, the passive magnetic cavity structure generates an induced magnetic field during operation, which helps to increase the amplitude and displacement of low-frequency vibration, thus improving both low and high frequencies. Then, the sound waves are transmitted to the plane or curved surface of the sound-generating glass through a superconducting diaphragm structure, thereby ensuring that the displacement does not increase but the performance is greatly improved, which is safe and meets the requirements of new energy sources.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: A passive rear cavity wall based on a planar sound field, comprising active devices and a planar material, wherein several active devices are evenly distributed and spaced together on the upper surface of the planar material; its innovation lies in that it further comprises a magnetic structure, a magnetic thin film, and a pressure-sensitive adhesive layer; each magnetic structure is a ferrimagnetic structure, and several magnetic structures are spliced ​​together by the pressure-sensitive adhesive layer to form a U-shaped or H-shaped magnetic cavity structure matching the active device; each magnetic cavity structure is located directly below the corresponding active device at a central position, and is respectively bonded and fixed to the corresponding position on the lower surface of the planar material by the pressure-sensitive adhesive layer; a matching magnetic thin film is also aligned and attached to the outer surface of each magnetic cavity structure, each magnetic thin film is magnetic, and is initially fixed by the magnetic attraction between it and the corresponding magnetic cavity structure, and adsorbs and seals the corresponding magnetic cavity structure, thereby forming a top-down passive rear cavity wall matching the active device.

[0006] Preferably, the planar material is flat or curved glass used in high-speed rail, subway, or automobiles, or a non-glass planar material.

[0007] Preferably, each of the active devices can be a linear motor, a piezoelectric ceramic, or an actuator.

[0008] Preferably, each of the magnetic structures is formed by two or more magnetic atoms or ions with unequal magnetic moments and opposite orientations, thus forming an anti-mode; it corresponds to the N and S poles of the magnetic field, opposite poles attract each other, and ensures that its magnetic field distribution is the same as that of the magnet; a black epoxy layer is also plated on the outside of each of the magnetic structures, and the epoxy layer is treated to be flat and smooth.

[0009] Preferably, each of the magnetic cavity structures is assembled by splicing magnetic structures using the principle of mutual magnetic attraction, and the joints are bonded and fixed by a pressure-sensitive adhesive layer.

[0010] Preferably, the size of each of the magnetic cavity structures is larger than the size of the corresponding active device, and is centered relative to the corresponding active device.

[0011] Preferably, magnetic cavity holes are symmetrically embedded on the upper surface of the U-shaped magnetic cavity structure near its two ends, and on the upper and lower surfaces of the H-shaped magnetic cavity structure near its two ends. The U-shaped magnetic cavity structure and the H-shaped magnetic cavity structure are respectively in contact with the lower surface of the planar material at corresponding positions through the surfaces with magnetic cavity holes, and are bonded and fixed by pressure-sensitive adhesive layer. The opening position of each magnetic cavity hole is set at the position of vibration difference.

[0012] Preferably, the magnetic thin film is an alloy thin film formed by combining multiple rare metals, and it is magnetic and works in conjunction with the magnetic cavity structure to enhance the magnetic field.

[0013] Preferably, the pressure-sensitive adhesive layer is an adhesive that is sensitive to pressure.

[0014] The beneficial effects of this invention are:

[0015] (1) Without changing the overall structure and power of the music glass, the present invention increases the low-frequency vibration amplitude and displacement by the induced magnetic field formed by the passive magnetic cavity structure during operation, thereby improving the low and high frequencies; and then transmits the sound waves to the glass plane or curved surface through the superconducting diaphragm structure, thereby ensuring that the displacement does not increase but the performance is greatly improved, which is safe and meets the requirements of new energy.

[0016] (2) The passive rear cavity wall of the present invention does not directly contact the sound-generating surface, but interacts directly with the main superconducting diaphragm. The low-frequency suppression it generates can not only increase the low frequency, but also the power is the same as before, which is environmentally friendly and safe. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Figure 1 This is a schematic diagram of the rear cavity wall of the U-shaped magnetic cavity structure of the present invention.

[0018] Figure 2 This is a schematic diagram of the rear cavity wall of the H-shaped magnetic cavity structure of the present invention.

[0019] Among them, 1-active device; 2-planar material; 3-magnetic structure; 4-magnetic cavity structure; 5-magnetic thin film; 6-pressure-sensitive adhesive layer. Detailed Implementation

[0020] The technical solution of the present invention will be clearly and completely described below through specific embodiments.

[0021] This invention discloses a passive rear cavity wall based on a planar sound field, comprising a magnetic structure 3, a magnetic thin film 5, and a pressure-sensitive adhesive layer 6; wherein, several active devices 1 are evenly distributed and spaced together on the upper surface of a planar material 2; the planar material 2 is a flat or curved glass used in high-speed rail, subway, or automobiles, or a non-glass planar surface; each active device 1 can be a linear motor, piezoelectric ceramic, or exciter, thereby driving vibration to achieve surface sound generation; the specific structure is as follows. Figure 1 , Figure 2As shown, each magnetic structure 3 is a ferrimagnetic magnetic structure 3, and several magnetic structures 3 are spliced ​​together by pressure-sensitive adhesive layer 6 to form a U-shaped or H-shaped magnetic cavity structure 4 that matches the active device 1. Each magnetic cavity structure 4 is set at the center position directly below the corresponding active device 1, and is respectively bonded and fixed to the corresponding position on the lower surface of the planar material 2 by pressure-sensitive adhesive layer 6.

[0022] like Figure 1 , Figure 2 As shown, each magnetic structure 3 is formed by two or more magnetic atoms or ions with unequal magnetic moments and opposite orientations, thus forming an anti-mode. It resonates with the N and S poles of the magnetic field, and opposite poles attract each other. The magnetic structure 3 needs to be magnetized to meet a certain magnetic flux to make it magnetic and ensure that its magnetic field distribution is the same as that of the magnet. A black epoxy layer is also plated on the outside of each magnetic structure 3. The epoxy layer is smoothed and ensures that the magnetic structure 3 has corrosion resistance, wear resistance and temperature resistance.

[0023] Each magnetic cavity structure 4 in this invention is assembled from magnetic structures 3 using the principle of magnetic attraction, and their joints are bonded and fixed by a pressure-sensitive adhesive layer 6, ensuring that their contact points are sealed, flat, and smooth; for example Figure 1 , Figure 2 As shown, the size of each magnetic cavity structure 4 is larger than the size of the corresponding active device 1, and is centered relative to the corresponding active device 1, thereby covering the corresponding active device 1 within its range.

[0024] like Figure 1 , Figure 2 As shown, magnetic cavity holes are symmetrically embedded at both ends of the upper surface of the U-shaped magnetic cavity structure 4 and at both ends of the upper and lower surfaces of the H-shaped magnetic cavity structure 4. The U-shaped and H-shaped magnetic cavity structures 4 are respectively in contact with the corresponding positions of the lower surface of the planar material 2 through the surfaces with the magnetic cavity holes, and are bonded and fixed by the pressure-sensitive adhesive layer 6. Each magnetic cavity hole is positioned at a location with a difference in vibration intensity. The selection of the U-shaped or H-shaped magnetic cavity structure 4 in this invention is based on the magnitude of the vibration of the active surface of the metasurface crystal layer in the superconducting diaphragm structure. Specifically, when the vibration intensity is large, a U-shaped magnetic cavity structure 4 is selected, ensuring that the square of the magnetic cavity hole corresponds to the square with the smallest vibration intensity; when the vibration intensity is small, an H-shaped magnetic cavity structure 4 is selected, increasing vibration by increasing airflow, thereby ensuring that the amplitude remains the same even when the overall vibration on the metasurface crystal layer increases, resulting in stable sound wave transmission.

[0025] In this invention, a matching magnetic thin film 5 is also aligned and attached to the outer surface of each magnetic cavity structure 4, such as... Figure 1 , Figure 2As shown, each magnetic thin film 5 is magnetic and is initially fixed by the magnetic attraction between itself and the corresponding magnetic cavity structure 4, thus adsorbing and sealing the corresponding magnetic cavity structure 4. This forms a passive rear cavity wall from top to bottom that matches the active device 1, and the magnetic field is strengthened through the magnetic thin film 5 and the magnetic cavity structure 4. The magnetic thin film 5 is an alloy thin film formed by combining various rare metals, and it is magnetic. It works with the magnetic cavity structure 4 to enhance the magnetic field, thereby boosting low and high frequencies. During operation, the main diaphragm transmits force to the magnetic structure 3, increasing the magnetic field of the magnetic structure 3 itself. Then, through the action of the magnetic cavity structure 4, the weak magnetic cavity of the magnetic thin film 5, under the influence of air, further increases the amplitude of the magnetic thin film 5, ensuring that the passive rear cavity wall has sufficient amplitude, thereby boosting low and high frequencies.

[0026] The pressure-sensitive adhesive layer 6 of this invention is an adhesive that is sensitive to pressure, and is used for fixation; wherein, the pressure-sensitive adhesive layer 6 has excellent electrical properties, good leakage current, uniform water resistance, temperature resistance and weather resistance, and can bond a variety of difficult-to-bond low surface energy materials.

[0027] When the sound source is working, the vibration generated by the present invention is transmitted to the passive rear cavity wall. Under the influence of the magnetic field, the rear cavity wall, the magnetic thin film 5 and the magnetic structure 3 are all affected by the gas flow during operation, which triple strengthens the magnetic field, thereby improving the low and high frequencies of the surface sound field.

[0028] The beneficial effects of this invention are:

[0029] (1) Without changing the overall structure and power of the music glass, the present invention increases the low-frequency vibration amplitude and displacement through the induced magnetic field formed by the passive magnetic cavity structure 4 during operation, thereby improving the low and high frequencies; and then transmits the sound waves to the glass plane or curved surface through the superconducting diaphragm structure, thereby ensuring that the displacement does not increase but the performance is greatly improved, which is safe and meets the requirements of new energy.

[0030] (2) The passive rear cavity wall of the present invention does not directly contact the sound-generating surface, but interacts directly with the main superconducting diaphragm. The low-frequency suppression it generates can not only increase the low frequency, but also the power is the same as before, which is environmentally friendly and safe.

[0031] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the concept and scope of the present invention. Without departing from the design concept of the present invention, all modifications and improvements made by those skilled in the art to the technical solutions of the present invention should fall within the protection scope of the present invention. The technical content for which protection is sought in the present invention has been fully described in the technical requirements.

Claims

1. A passive rear cavity wall based on a planar sound field, comprising active devices and a planar material, wherein a plurality of said active devices are evenly distributed and spaced together on the upper surface of said planar material; characterized in that: It also includes a magnetic structure, a magnetic thin film, and a pressure-sensitive adhesive layer; each of the magnetic structures is a ferrimagnetic magnetic structure, and several of the magnetic structures are spliced ​​together by the pressure-sensitive adhesive layer to form a U-shaped or H-shaped magnetic cavity structure that matches the active device. Each magnetic cavity structure is located at the center directly below the corresponding active device, and is respectively bonded and fixed to the corresponding position on the lower surface of the planar material by the pressure-sensitive adhesive layer; a matching magnetic thin film is also aligned and attached to the outer surface of each magnetic cavity structure. Each magnetic thin film is magnetic, and is initially fixed by the magnetic attraction between it and the corresponding magnetic cavity structure, and adsorbs and seals the corresponding magnetic cavity structure, thereby forming a passive rear cavity wall from top to bottom that matches the active device.

2. The passive rear cavity wall based on a planar sound field according to claim 1, characterized in that: The flat material is flat or curved glass used in high-speed rail, subway, or automobiles, or a non-glass flat surface.

3. The passive rear cavity wall based on a planar sound field according to claim 1, characterized in that: Each of the active devices described can be a linear motor, a piezoelectric ceramic, or an actuator.

4. The passive rear cavity wall based on a planar sound field according to claim 1, characterized in that: Each of the magnetic structures is formed by the unequal magnitudes and opposite orientations of two or more magnetic atoms or ions, thus creating an anti-mode; it resonates with the N and S poles of the magnetic field, attracting each other and ensuring that its magnetic field distribution is the same as that of the magnet; a black epoxy layer is also plated on the outside of each of the magnetic structures, and the epoxy layer is treated to be smooth.

5. A passive rear cavity wall based on a planar sound field according to claim 1, characterized in that: Each of the aforementioned magnetic cavity structures is assembled by splicing together magnetic structures using the principle of mutual magnetic attraction, and the joints are bonded and fixed by a pressure-sensitive adhesive layer.

6. The passive rear cavity wall based on a planar sound field according to claim 1, characterized in that: Each of the magnetic cavity structures is larger than the size of the corresponding active device and is centered relative to the corresponding active device.

7. A passive rear cavity wall based on a planar sound field according to claim 1, characterized in that: Magnetic cavity holes are symmetrically embedded on the upper surface of the U-shaped magnetic cavity structure near its two ends, and on the upper and lower surfaces of the H-shaped magnetic cavity structure near its two ends. The magnetic cavity structures of the U-shaped and H-shaped structures are respectively in contact with the lower surface of the planar material at corresponding positions through the surfaces with magnetic cavity holes, and are bonded and fixed by pressure-sensitive adhesive layers. The opening position of each magnetic cavity hole is set at the position of vibration difference.

8. A passive rear cavity wall based on a planar sound field according to claim 1, characterized in that: The magnetic thin film is an alloy thin film formed by combining multiple rare metals, and it is magnetic, and works with the magnetic cavity structure to enhance the magnetic field.

9. A passive rear cavity wall based on a planar sound field according to claim 1, characterized in that: The pressure-sensitive adhesive layer is an adhesive that is sensitive to pressure.

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