A high-pitched sound generating device

Abstract

The application discloses a high-pitched sound generating device. The high-pitched sound generating device comprises a frame structure, the frame structure comprises a yoke, the yoke is provided with a containing groove, and a bearing table is formed above the containing groove; a magnetic circuit system, the magnetic circuit system comprises a central magnetic component, the central magnetic component is provided with a through hole, and the magnetic circuit system is arranged on the bearing table; a vibration assembly, the vibration assembly comprises a diaphragm, the diaphragm is connected with the frame structure at the edge, the diaphragm covers the through hole of the central magnetic component, and the diaphragm communicates with the containing groove through the through hole; and sound-absorbing material, the sound-absorbing material is arranged in the containing groove. One technical effect of the application is to expand the space of the rear sound cavity of the high-pitched sound generating device.

Description

Technical Field

[0001] This application belongs to the field of electroacoustic transduction technology, specifically, this application relates to a high-frequency sound generating device. Background Technology

[0002] With the development of electroacoustic transduction technology, sound-generating devices are widely used in people's daily lives. Not only are dedicated audio-visual equipment equipped with sound-generating devices, but they can also be installed in vehicles and buildings for convenient daily use.

[0003] In this field, different types of sound-generating devices can be designed to achieve better acoustic effects for different frequency bands and volumes of sound to be produced. For example, existing large woofers and tweeters in this field can be used in home audio systems, car audio systems, and other products.

[0004] Due to their acoustic performance requirements, tweeters are generally smaller than woofers. To meet the demands of limited assembly space, those skilled in the art have further refined tweeter designs to achieve greater compactness. This design compresses the rear cavity space of the tweeter. When the tweeter vibrates and produces sound, the air pressure in the rear cavity increases due to vibration, temperature, and other factors. This makes the air in the rear cavity more prone to resonance, thus affecting the tweeter's acoustic performance. Summary of the Invention

[0005] One object of this application is to provide an improved high-frequency sound-generating device.

[0006] According to one aspect of this application, a high-frequency sound-generating device is provided, comprising:

[0007] A frame structure, the frame structure including a basin stand, the basin stand having a receiving groove, and a support platform formed above the receiving groove;

[0008] A magnetic circuit system, comprising a central magnetic component having a through hole, wherein the magnetic circuit system is disposed on the support platform;

[0009] A vibration assembly, comprising a diaphragm, the edge of which is connected to the frame structure, the diaphragm covering the through hole of the central magnetic component, and the diaphragm communicating with the receiving groove through the through hole;

[0010] Sound-absorbing material, wherein the sound-absorbing material is disposed in the receiving groove.

[0011] Optionally, the sound-absorbing material has perforated holes, the perforations corresponding to the positions of the through holes.

[0012] Optionally, the diameter of the perforated hole is smaller than the diameter of the through hole.

[0013] Optionally, the sound-absorbing material is sound-absorbing foam or non-foamed sound-absorbing material.

[0014] Optionally, a sound-guiding protrusion is formed on the bottom surface of the receiving groove. The sound-guiding protrusion extends along the axial direction of the through hole towards the diaphragm, and the sound-absorbing material is disposed around the sound-guiding protrusion.

[0015] Optionally, the side surface of the acoustic protrusion is an inclined arc-shaped surface.

[0016] Optionally, the acoustic protrusion has an arc-shaped top surface.

[0017] Optionally, the radial dimension of the sound-guiding protrusion along the through hole is smaller than the diameter of the through hole.

[0018] Optionally, the height of the acoustic protrusion is lower than the depth of the receiving groove.

[0019] Optionally, the frame structure includes an upper shell that is fastened to the diaphragm, the magnetic circuit system being located inside the upper shell, the upper shell having a sound outlet, and the side of the diaphragm away from the magnetic circuit system communicating with the sound outlet.

[0020] The technical advantage of this application is that it increases the volume of the acoustic cavity inside the high-frequency sound-generating device, thereby improving the acoustic performance of the high-frequency sound-generating device.

[0021] Other features and advantages of this application will become clear from the following detailed description of exemplary embodiments with reference to the accompanying drawings. Attached Figure Description

[0022] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments of the present application and, together with their description, serve to explain the principles of the present application.

[0023] Figure 1 A side sectional view of a high-frequency sound-generating device provided in one embodiment of this application;

[0024] Figure 2 A side sectional view of a high-frequency sound-generating device provided in another embodiment of this application;

[0025] Figure 3 A schematic diagram illustrating the effect of the high-frequency sound-generating device provided in this application on airflow;

[0026] Figure 4 A comparison chart of the sensitivity test results of the high-frequency sound-generating device provided in this application and the prior art.

[0027] Explanation of reference numerals in the attached figures:

[0028] 11. Basket; 111. Receiving groove; 112. Sound guiding protrusion; 12. Upper shell; 21. Central magnetic component; 211. Through hole; 22. Side magnetic component; 23. Magnetic gap; 31. Diaphragm; 32. Coil; 4. Sound absorbing material; 41. Hole. Detailed Implementation

[0029] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the present application.

[0030] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the scope of this application and its application or use.

[0031] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0032] In all the examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0033] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0034] This application provides an improved high-frequency sound-generating device, which includes a frame structure, a magnetic circuit system, a vibrating component, and a sound-absorbing material 4. For example... Figure 1 As shown, the frame structure includes a basket frame 11, which supports and supports the various components of the tweeter. The basket frame 11 is typically located at the bottom of the tweeter. A receiving groove 111 is formed on the basket frame 11, which may be a recessed groove structure. A support platform is formed above the receiving groove 111 on the basket frame 11. The basket frame 11 can provide different forms of support for the tweeter through the receiving groove 111 and the support platform.

[0035] The magnetic circuit system is used to generate a magnetic field in the high-frequency sound-generating device, thereby providing an electromagnetic driving force to the conductive components of the vibrating assembly, enabling the conductive components to vibrate. The magnetic circuit system includes a central magnetic component 21, which generates a magnetic field around itself. The central magnetic component 21 can be a magnet, an electromagnet, or a magnetically conductive component. Other components of the magnetic circuit system, together with the central magnetic component 21, can form a magnetic field within the frame structure to drive the vibrating assembly. The central magnetic component 21 has a through-hole 211, such as... Figure 1 As shown. The entire magnetic circuit system is located on the support platform, and the through hole 211 is connected to the receiving groove located below the support platform.

[0036] The vibration assembly includes a diaphragm 31, the edge of which is connected to the frame structure, such as... Figure 1 As shown, the diaphragm 31 is encapsulated on top of the overall frame structure. Conductive components such as coils 32 or conductive lines can be connected to the diaphragm 31, extending into the magnetic field generated by the magnetic circuit system. When current is passed through the conductive components, the current and the magnetic field generate an electromagnetic force, thereby driving the vibrating component to move and vibrate. Through this vibration principle, the vibrating component can vibrate and produce sound. The diaphragm 31 covers the through-hole 211 on the central magnetic component 21, and the diaphragm 31 can communicate with the receiving groove 111 through the through-hole 211.

[0037] The tweeter device provided in this application increases the space between the diaphragm and the rear acoustic cavity on one side of the device by creating a through-hole in the central magnetic component of the magnetic circuit system. Furthermore, the through-hole guides the flow and compression of air. When the tweeter vibrates and produces sound, the entire space within the frame structure, connected to the receiving groove via the through-hole, forms the rear acoustic cavity. The vibration of the diaphragm and the increase in temperature cause the air in the rear acoustic cavity to flow and compress along the axial direction of the through-hole. The through-hole on the central magnetic component effectively increases the internal space of the tweeter, alleviating the problem of a significant increase in internal air pressure during operation, which could affect acoustic performance.

[0038] The sound-absorbing material 4 is disposed in the receiving groove 111, such as Figure 1 As shown. The sound-absorbing material 4 can absorb vibrations and air molecules. Since the diaphragm 31 is connected to the receiving groove 111 through the through hole 211, the sound-absorbing material 4 can effectively absorb the vibration inside the tweeter, reducing the risk of resonance. When the air pressure inside the tweeter increases, the sound-absorbing material 4 can also absorb air molecules to a certain extent, which is equivalent to increasing the rear acoustic cavity, thereby alleviating the problem of increased air pressure.

[0039] This application utilizes through-holes in the central magnetic component in conjunction with sound-absorbing material to fully utilize the internal space of the tweeter, significantly increasing the space within the rear acoustic cavity capable of effectively absorbing air pressure and vibration. The air in the rear acoustic cavity is guided by the through-holes, allowing vibrations to be directionally transmitted to the sound-absorbing material, where they are absorbed and buffered. This technical solution effectively reduces the resonant frequency FO of the tweeter, improving its acoustic performance.

[0040] Optionally, the sound-absorbing material 4 has perforations 41, such as... Figure 2 As shown. The position of the perforated hole 41 corresponds to the position of the through hole 211. By forming the perforated hole 41 at the position corresponding to the through hole 211, the contact area between the air and the sound-absorbing material 4 at the through hole 211 can be increased, thereby improving the absorption response speed of the sound-absorbing material 4 to air molecules and vibrations. The shape of the perforated hole 41 can match the shape of the through hole. For example, if the through hole is a cylindrical hole or a rectangular hole, then the perforated hole 41 is also a cylindrical hole or a rectangular hole. The through hole and the perforated hole 41 are parallel to each other on the axis, or are coaxially arranged. This design allows the perforated hole 41 to better adapt to the air guidance of the through hole. The through hole can guide the air along the axis. The matching shape and orientation of the perforated hole and the through hole allows air molecules to flow more smoothly into the perforated hole and fully contact the surrounding sound-absorbing material, achieving rapid adsorption of air and vibrations.

[0041] Optionally, the diameter of the perforated hole 41 is smaller than the diameter of the through hole. The sound-absorbing material 4 partially blocks the end face of the through hole, allowing vibrations transmitted into the through hole to be directly absorbed by the sound-absorbing material 4. In a limited space, the larger the volume of the sound-absorbing material 4, the stronger its ability to absorb air molecules and vibrations. If the size of the perforated hole 41 is too large, the space utilization rate of the receiving groove will be reduced, affecting the overall acoustic performance improvement effect of the sound-absorbing material 4. Designing the diameter of the perforated hole 41 to be smaller than the diameter of the through hole allows for better utilization of the receiving groove space, enabling the sound-absorbing material to fully absorb and buffer vibrations in the through hole.

[0042] Optionally, the sound-absorbing material can be foam or non-foamed sound-absorbing material. Both foam and non-foamed sound-absorbing materials have a porous structure. The porous structure can absorb air molecules and vibrations, effectively buffering changes in air pressure and vibrations. This application does not limit the specific structure or material of the sound-absorbing material. In optional embodiments, this application can use a method of bonding and fixing foam in a receiving groove; alternatively, it can use a method of making non-foamed sound-absorbing material into granules, encapsulating the granules with a breathable component, and then loading the whole into the receiving groove.

[0043] Optionally, such as Figure 2As shown, a sound-guiding protrusion 112 is formed on the bottom surface of the receiving groove 111, and the sound-guiding protrusion 112 protrudes upward from the bottom surface of the receiving groove 111. The extension direction of the sound-guiding protrusion 112 is along the axial direction of the through hole 211, and it protrudes and extends a certain distance towards the diaphragm 31. The position of the sound-guiding protrusion 112 corresponds to the position of the through hole 211. The sound-absorbing material 4 can be disposed around the sound-guiding protrusion 112.

[0044] The sound-guiding protrusion 112 can guide the airflow inside the tweeter. When the diaphragm 31 vibrates, causing airflow and pressure changes, the sound-guiding protrusion 112, extending axially along the through-hole 211, guides and diverts the airflow within the through-hole 211, directing the air and vibrations towards the sound-absorbing material 4 surrounding it. The air and vibrations are efficiently absorbed by the sound-absorbing material through the guidance of the sound-guiding protrusion, thereby reducing the overall resonant frequency of the tweeter, preventing acoustic problems such as resonance, and exhibiting better high-frequency vibration performance.

[0045] Optionally, such as Figure 2 As shown, the sidewall of the sound-guiding protrusion 112 can be an arc surface. That is, the side surface of the sound-guiding protrusion 112 has an inclined arc-shaped surface. The sound-guiding protrusion 112 as a whole has an arc-shaped protrusion structure that gradually tapers from bottom to top along the axial section. The arc-shaped surface can better guide the airflow in the through hole 211. Figure 2 , 3 In the embodiment shown, the air flowing through the through hole 211 flows downward to the receiving groove 111 and the arc-shaped side surface of the sound-guiding protrusion 112 guides the air to the periphery of the sound-guiding protrusion 112, so that the vibration can be smoothly transmitted to the sound-absorbing material.

[0046] Optionally, the top of the sound-guiding protrusion 112 has an arc-shaped top surface, such as... Figure 2 As shown, both the curved top and side surfaces can guide airflow and air vibration. Compared to the flat top surface of the sound-guiding protrusion, the curved top surface can more smoothly guide airflow to the surrounding sound-absorbing material, reducing airflow obstruction and rebound.

[0047] Optionally, the radial dimension of the sound-guiding protrusion 112 along the through hole 211 is smaller than the diameter of the through hole 211. For example, the sound-guiding protrusion 112 can be a cylindrical structure, the axis of which can overlap with the axis of the through hole 211, and the diameter of the cylindrical structure is smaller than the diameter of the through hole 211. If the diameter of the sound-guiding protrusion 112 is too large, it may cause the sound-guiding protrusion 112 to block the through hole 211, that is, the sound-guiding protrusion 112 will hinder and rebound the airflow in the through hole 211. This phenomenon will make it difficult for the receiving groove to form part of the rear acoustic cavity, and will also weaken the sound absorption effect of the sound-absorbing material. Therefore, by designing the radial dimension of the protrusion along the through hole to be smaller than the diameter of the through hole, the sound-guiding protrusion can guide the airflow while minimizing its obstructive effect. This improves the actual effective space of the rear acoustic cavity in the high-frequency sound-generating device and maximizes the sound absorption effect of the sound-absorbing material.

[0048] Optionally, the height of the sound-guiding protrusion 112 is lower than the depth of the receiving groove 111. In such cases... Figure 2 , 3 In the illustrated embodiment, the sound-guiding protrusion 112 protrudes upward from the bottom surface of the receiving groove 111, and the entire sound-guiding protrusion 112 is located within the receiving groove 111, with its top end lower than the upper edge of the receiving groove 111. This embodiment minimizes the possibility of the sound-guiding protrusion extending into the through hole from the receiving groove, thus reducing the likelihood of blockage. If the height of the sound-guiding protrusion is too high, protruding upward into the through hole, it may prevent the air from flowing smoothly within the through hole, thereby reducing the pressure relief capacity of the rear acoustic cavity.

[0049] The high-frequency sound-generating device provided in this application effectively increases the space of the internal acoustic cavity and guides the airflow in the rear acoustic cavity. This design can effectively reduce the resonant frequency F0 of the sound-generating device, widen the bandwidth of the product, and the guiding effect of the structure on the air inside the cavity makes the high-frequency sound performance of the sound-generating device better.

[0050] Figure 4This illustration shows the variation of the response sensitivity of the tweeter device provided in this application to sound signals with the frequency of the sound signal. The tweeter device provided in this application exhibits higher response sensitivity compared to existing technologies within the sound vibration frequency range of 8kHz-20kHz. This indicates that the rear acoustic cavity inside the tweeter device can more significantly absorb vibrations and stabilize air pressure, thereby enabling the diaphragm to exhibit superior vibration sensitivity. In the higher vibration frequency range of 10kHz-20kHz, the tweeter device of this application clearly demonstrates superior response sensitivity and better acoustic performance. Among acoustic products of the same size, the rear acoustic cavity of the tweeter device of this application can better perform its acoustic function and improve the high-frequency vibration performance of the vibrating components.

[0051] Optionally, the frame structure may further include an upper shell 12, such as Figure 1 , 2 As shown, the upper shell 12 is fastened to the frame 11, forming a complete housing structure. The magnetic circuit system is located within the space enclosed by the upper shell 12, and the frame 11 supports the upper shell 12 and the magnetic circuit system. A sound outlet is formed on the upper shell 12. The diaphragm 31 can be disposed within the upper shell 12 or on the magnetic circuit system. One side of the diaphragm 31 communicates with the sound outlet. For example, one side of the diaphragm 31 can face the sound outlet. The space between the diaphragm 31 and the sound outlet allows air circulation, enabling sound vibrations to be transmitted from the sound outlet. The side of the diaphragm 31 facing away from the sound outlet communicates with the receiving groove 111 through a through hole 211; this space serves as the rear acoustic cavity of the tweeter. The frame 11 can be made of plastic to reduce weight. Through this structural design, on the one hand, the frame structure can provide overall support for the magnetic circuit system and vibration components, and on the other hand, the interlocking top cover and frame facilitate the formation of a closed space with the magnetic circuit system to meet the performance requirements for high-frequency generation.

[0052] Optionally, the magnetic circuit system may further include a peripheral magnetic component 22, such as... Figure 1 As shown. A magnetic gap 23 is formed between the edge magnetic component 22 and the central magnetic component 21. In optional embodiments, the edge magnetic component 22 can be a magnet, and the central magnetic component 21 can be a magnetically conductive iron; or, both the central magnetic component 21 and the edge magnetic component 22 can be magnets; or, the edge magnetic component 22 can be a magnetically conductive component, and the central magnetic component 21 can be a magnet. By forming the magnetic gap 23, a stable and uniform magnetic field can be provided to the conductive components on the vibration assembly. The conductive components of the vibration assembly can be coils 32, such as... Figure 1 As shown.

[0053] While specific embodiments of this application have been described in detail by way of examples, those skilled in the art should understand that the above examples are for illustrative purposes only and are not intended to limit the scope of this application. Those skilled in the art should understand that modifications can be made to the above embodiments without departing from the scope and spirit of this application. The scope of this application is defined by the appended claims.

Claims

1. A high-frequency sound-generating device, characterized in that, include: A frame structure, the frame structure including a basin stand, the basin stand having a receiving groove, and a support platform formed above the receiving groove; A magnetic circuit system, comprising a central magnetic component having a through hole, wherein the magnetic circuit system is disposed on the support platform; A vibration assembly, comprising a diaphragm, the edge of which is connected to the frame structure, the diaphragm covering the through hole of the central magnetic component, and the diaphragm communicating with the receiving groove through the through hole; The sound-absorbing material is disposed in the receiving groove; the sound-absorbing material has hollow holes, the hollow holes are positioned corresponding to the through holes, the shape of the hollow holes can match the shape of the through holes, and the through holes and the hollow holes are axially parallel or coaxially arranged. A sound-guiding protrusion is formed on the bottom surface of the receiving groove. The sound-guiding protrusion extends along the axial direction of the through hole towards the diaphragm. The sound-absorbing material is disposed around the sound-guiding protrusion, and the sound-guiding protrusion guides air and vibrations onto the sound-absorbing material.

2. The high-frequency sound-generating device according to claim 1, characterized in that, The diameter of the perforated hole is smaller than the diameter of the through hole.

3. The high-frequency sound-generating device according to claim 1, characterized in that, The sound-absorbing material is sound-absorbing foam or non-foamed sound-absorbing material.

4. The high-pitched sound-generating device according to claim 1, characterized in that, The side surface of the acoustic protrusion is an inclined arc-shaped surface.

5. The high-frequency sound-generating device according to claim 1, characterized in that, The acoustic protrusion has an arc-shaped top surface.

6. The high-pitched sound-generating device according to claim 1, characterized in that, The radial dimension of the sound-guiding protrusion along the through hole is smaller than the diameter of the through hole.

7. The high-pitched sound-generating device according to claim 1, characterized in that, The height of the acoustic protrusion is lower than the depth of the receiving groove.

8. The high-pitched sound-generating device according to claim 1, characterized in that, The frame structure includes an upper shell that is fastened to the diaphragm, the magnetic circuit system being located inside the upper shell, the upper shell having a sound outlet, and the side of the diaphragm away from the magnetic circuit system communicating with the sound outlet.

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