A large aperture micro subwoofer

Abstract

The utility model relates to loudspeaker technical field especially a kind of large-caliber micro low-frequency loudspeaker, including support, magnet cover installed on support, magnetic steel setting on magnet cover, voice coil matched with magnetic steel, diaphragm is connected with voice coil and is arranged on the support, ball top is arranged on the diaphragm, the diaphragm is made of high molecular elastomer material, the ball top is made of single-layer aluminum material, the utility model uses elastomer as diaphragm, uses single-layer aluminum material as ball top, compared with conventional size product, there is greater effective radiation area, higher low-frequency loudness.

Description

Technical Field

[0001] This utility model relates to the field of loudspeaker technology, specifically to a large-diameter miniature woofer. Background Technology

[0002] Miniature speakers, as key acoustic components of smart terminals, are widely used in portable electronic devices such as mobile phones, laptops, and tablets. Due to the pursuit of thin and light designs in smart terminal products, their internal space is extremely compact, posing a significant challenge to the acoustic performance of speaker systems. Current mainstream solutions typically employ a crossover design, using a combination of miniature woofers and tweeters to cover the full frequency range for sound reproduction. However, traditional miniature woofers often require a large vibration space and magnetic circuit volume to achieve sufficient low-frequency response. This not only contradicts the trend towards thinner and lighter electronic devices but also significantly encroaches on the layout space of core components such as batteries and motherboards. Especially in ultra-thin devices such as smartphones, the speaker installation depth is usually limited to within 3mm, severely restricting low-frequency sound pressure level and sound quality. Existing miniature speakers also have significant shortcomings in material application. Ordinary polymer diaphragms are prone to creep deformation under long-term large-amplitude vibration, while composite metal diaphragms suffer from excessive mass and high-frequency segmentation vibration, making it difficult to balance low-frequency power and high-frequency clarity. Furthermore, traditional magnetic circuit systems have low magnetic energy utilization, requiring larger magnets to meet driving demands. This further exacerbates the space competition between the speaker module and other internal components. Therefore, existing technologies urgently need improvement to address these issues. Utility Model Content

[0003] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a large-diameter miniature bass speaker.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a large-diameter miniature bass speaker, comprising a bracket, a magnetic cover mounted on the bracket, a magnet disposed on the magnetic cover, and a voice coil cooperating with the magnet. The bracket is provided with a diaphragm connected to the voice coil, and the diaphragm is provided with a dome. The diaphragm is made of a high-molecular elastomer material, and the dome is made of a single layer of aluminum material.

[0005] In some embodiments, the magnet is provided with pole pieces.

[0006] In some embodiments, a rectangular hole is provided at the center of the electrode.

[0007] In some embodiments, a second rectangular hole is provided at the center of the dome, opposite to the first rectangular hole.

[0008] Compared with the prior art, the beneficial effects of this utility model are: the diaphragm is made of high molecular elastomer material and is combined with a single-layer aluminum dome, which makes it thin and light while having a larger effective radiation area to ensure better bass performance.

[0009] The diaphragm is made of a high-molecular elastomer material, which has excellent resistance to creep, impact, and fatigue, ensuring long-term reliable use of the product.

[0010] The dome is made of a single layer of aluminum material, which has a thinner volume and lighter weight, increases the effective radiation area by 50%, and effectively improves the low-frequency loudness by 10dB.

[0011] Details of one or more embodiments of this application are set forth in the following drawings and description to make other features, objects and advantages of this application more readily apparent. The embodiments of this application will provide a detailed description and understanding of the application. Attached Figure Description

[0012] Figure 1 This is an exploded view of the present invention;

[0013] Figure 2 This is a schematic diagram of the diaphragm and dome assembly of this utility model;

[0014] Figure 3 This is a cross-sectional view of the diaphragm and dome of this utility model.

[0015] In the diagram: 1. Support; 2. Magnet cover; 3. Magnet; 4. Voice coil; 5. Diaphragm; 6. Dome; 7. Electrode; 8. Rectangular hole one; 9. Rectangular hole two. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] In existing technologies, miniature loudspeakers need to be designed to fit the internal space constraints of smart terminals, while traditional woofers suffer from reduced space utilization due to their large size. In conventional solutions, the insufficient mechanical properties of the diaphragm material easily lead to structural deformation, and the matching method between the diaphragm and the dome structure fails to effectively optimize acoustic radiation efficiency.

[0018] To address the aforementioned issues, given the limited internal space of smart terminals, a material combination scheme for the diaphragm and dome structure needs to be designed. Analysis revealed that the diaphragm material must possess both lightweight properties and structural stability, while the dome structure needs to improve sound wave radiation efficiency. Based on the coupling relationship between material mechanical properties and acoustic performance, a composite structure of polymer elastomers and metallic materials can be adopted, achieving optimized acoustic performance while maintaining structural strength.

[0019] Therefore, as Figure 1-3 As shown, this application proposes a structure including a support, a magnetic cover mounted on the support, a magnet disposed on the magnetic cover, and a voice coil cooperating with the magnet. A diaphragm connected to the voice coil is disposed on the support, and a dome is disposed on the diaphragm. The diaphragm is made of a polymer elastomer material, and the dome is made of a single layer of aluminum material.

[0020] Among them, polymeric elastomer materials refer to polymer materials with cross-linked molecular chains, specifically polyurethane or silicone rubber, whose cross-linked molecular chains provide anti-creep and anti-fatigue properties. Single-layer aluminum materials refer to metal sheets manufactured by stamping processes, specifically aluminum foil with a thickness of 0.05-0.2 mm, which are lightweight and have high rigidity, and can enhance sound wave radiation efficiency.

[0021] Specifically, the voice coil undergoes axial movement under the influence of a magnetic field, causing the diaphragm to deform and driving the dome to vibrate. The polymer elastomer material resists material fatigue caused by repeated deformation through molecular chain cross-linking, while the single-layer aluminum material expands the vibration radiation area through rigid support. The mating distance between the magnet and the voice coil can be optimized by adjusting the magnet cover's mounting position, and the connection between the dome and the diaphragm is fixed using adhesive bonding or hot pressing.

[0022] Compared to existing technologies, traditional diaphragms using non-crosslinked polymer materials are prone to creep, and dome structures employing composite laminates increase mass. This solution reduces overall mass through a single-layer material structure while simultaneously improving vibration transmission efficiency through a combination of material properties.

[0023] Through the above technical solutions, this application can improve the low-frequency sound wave radiation intensity within the same installation space, extend the service life of the diaphragm structure, and reduce the constraints of the overall mass of the speaker on the structural design of the terminal product.

[0024] This application further proposes setting pole pieces on the magnet.

[0025] In this context, the pole piece refers to a metal component mounted on the surface of the magnetic assembly for magnetic conduction. It can be made of soft magnetic materials, such as pure iron or silicon steel sheets. This component enhances magnetic field uniformity and optimizes the magnetic circuit distribution, playing a role in concentrating magnetic flux and improving transduction efficiency in the design.

[0026] Specifically, the pole pieces are mechanically fixed to the top surface of the magnet, forming a closed magnetic circuit with the magnet. The pole pieces create a uniform, radial magnetic field distribution area above the magnet, resulting in a more even force distribution when the voice coil cuts magnetic field lines. This structure reduces edge flux leakage, improves magnetic energy utilization, and allows the speaker to maintain sufficient driving force within a limited space.

[0027] Compared to existing technologies, traditional miniature subwoofers either lack pole pieces or employ asymmetrical magnetic structures, resulting in uneven magnetic field distribution and increased magnetic reluctance. The pole piece design in this application reduces magnetic reluctance loss by forming a symmetrical closed magnetic circuit, thereby increasing the effective magnetic flux density generated by the magnet within the same volume.

[0028] Through the above technical solution, this application optimizes the space utilization of the magnetic circuit system, reduces the overall thickness of the speaker, ensures that the magnetic field strength meets the low-frequency driving requirements, and solves the problem of incompatibility between the internal space of electronic devices and bass performance.

[0029] This application further proposes that a rectangular hole be provided at the center of the electrode.

[0030] The pole piece refers to a sheet-like component made of magnetically conductive material, specifically soft iron or silicon steel sheets, used to concentrate the magnetic field generated by the magnet and optimize the magnetic circuit distribution. The rectangular hole refers to a rectangular through-hole opened in the central area of ​​the pole piece, which can be achieved through stamping or laser cutting processes. This reduces the overall mass of the pole piece, lowers the inertia of the vibration system, and allows magnetic lines of force to pass more evenly through the voice coil area.

[0031] Specifically, in magnetic circuit systems where magnets and voice coils work together, the pole pieces are typically solid, and their relatively large mass can affect the response speed of the vibration system. By incorporating a rectangular hole at the center of the pole piece, material usage can be reduced without compromising magnetic conductivity, thereby lowering the mass of the vibration system. Furthermore, the symmetrical arrangement of the rectangular hole promotes uniform magnetic flux distribution, preventing nonlinear distortion caused by excessively strong local magnetic fields.

[0032] Compared to existing technologies, traditional pole pieces lack any perforation structure, resulting in greater inertia in the vibration system, limited transient response, and susceptibility of magnetic flux distribution to edge effects. This solution introduces a rectangular hole, achieving quality optimization while maintaining magnetic circuit efficiency, thereby improving low-frequency response sensitivity and enhancing magnetic field uniformity to reduce distortion.

[0033] Through the above technical solution, this application can effectively reduce the inertia of the vibration system, improve the low-frequency response speed, and optimize the uniformity of magnetic flux distribution while ensuring the performance of the magnetic circuit, thereby improving the clarity of sound quality and reducing the internal space occupation to meet the needs of micro devices for compact layout.

[0034] This application further proposes that a second rectangular hole, opposite to the first rectangular hole, be provided at the center of the dome.

[0035] The dome refers to the metal structure covering the diaphragm surface, which can be made of stamped aluminum. Its planar contour and the edge of the diaphragm form an integral vibration system. Rectangular hole one is a through-hole located in the central region of the electrode, which can be formed by laser cutting or stamping, and is used to adjust the distribution path of the magnetic field in the magnetic circuit. Rectangular hole two is a through-hole that maintains geometric symmetry with rectangular hole one, and can be formed by precision stamping, used to balance the airflow pressure distribution and reduce local stress concentration during dome vibration.

[0036] Specifically, during diaphragm vibration, the second rectangular aperture on the dome and the first rectangular aperture on the pole piece form a spatial correspondence. This allows the magnetic field generated by the magnet to diffuse evenly throughout the voice coil's range of motion after passing through the pole piece via the area of ​​the second rectangular aperture. When the voice coil undergoes axial displacement driven by current, the presence of the second rectangular aperture creates a flexible transition zone at the aperture edge of the vibration transmission path between the diaphragm and the dome, preventing vibration phase shift caused by rigid connection. Simultaneously, the spatially symmetrical arrangement of the two rectangular apertures allows the airflow to form bidirectional vortices along the aperture edges during vibration, reducing the impact of air resistance on high-frequency harmonics.

[0037] Compared to existing technologies, traditional miniature woofers typically employ a closed structure or asymmetrical opening design for their dome, resulting in limited magnetic field utilization and nonlinear distortion in vibration transmission efficiency as frequency changes. This solution utilizes a symmetrical layout of two rectangular openings to create a spatial match between the magnetic field path and the vibration transmission direction, while simultaneously improving the directivity of sound wave radiation by leveraging the geometric constraints at the opening edges.

[0038] Through the above technical solutions, this application can improve the magnetic field utilization efficiency of the loudspeaker in a limited space, reduce the nonlinear distortion caused by local stress concentration in the vibration system, and enhance the radiation uniformity of low-frequency sound waves in the sealed cavity, thereby improving the linearity and dynamic range of the low-frequency response while maintaining the miniaturized structure.

[0039] The above embodiments merely illustrate several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

[0040] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A large-diameter miniature bass speaker, characterized in that: It includes a bracket, a magnetic cover mounted on the bracket, a magnet disposed on the magnetic cover, and a voice coil that cooperates with the magnet. The bracket is provided with a diaphragm connected to the voice coil, and the diaphragm is provided with a dome. The diaphragm is made of a polymer elastomer material, and the dome is made of a single layer of aluminum material.

2. The large-diameter miniature subwoofer according to claim 1, characterized in that: The magnet is provided with pole pieces.

3. A large-diameter miniature bass speaker according to claim 2, characterized in that: A rectangular hole is provided at the center of the electrode.

4. A large-diameter miniature subwoofer according to claim 3, characterized in that: A second rectangular hole, opposite to the first rectangular hole, is provided at the center of the dome.

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