A micro loudspeaker structure with improved magnetic energy utilization

Abstract

This application relates to the field of miniature loudspeakers and discloses a miniature loudspeaker structure for improving magnetic energy utilization. The structure includes a frame, with a paper cone and a spring fixedly mounted on the inner wall of the frame. The dimensions of the spring surface are adapted to the dimensions of the inner wall of the frame. A housing is fixedly connected to the bottom of the frame, and a washer is fixedly mounted on the inner wall of the housing. Two main magnets are fixedly connected to the inner wall of the housing. Magnetic gaps are provided on the inner walls of the main magnets, and two auxiliary magnets are provided at both ends of the main magnets. Magnetic guide plates are movably mounted on the surfaces of the main magnets and auxiliary magnets. This application utilizes a racetrack-shaped main magnet mounted within the housing, with auxiliary magnets at both ends of the main magnet and magnetic gaps on the inner walls of the main magnets. This allows for a more uniform magnetic field distribution by combining a racetrack-shaped design with an unbalanced magnetic field layout. Furthermore, the magnetic field utilization is improved by using both linear and ring-shaped magnetic gaps.

Description

Technical Field

[0001] This application relates to the field of miniature loudspeakers, and more particularly to a miniature loudspeaker structure with improved magnetic energy utilization. Background Technology

[0002] A miniature loudspeaker is a small electronic component embedded in devices such as monitors and flat-panel speakers. It converts electrical signals into sound to output audio. Its core structure includes a magnetic circuit system, a vibrating component, and an acoustic cavity. A moving voice coil motor drives the diaphragm to vibrate and generate sound waves. It is mainly used in devices requiring built-in audio output, such as monitors and flat-panel speakers. For example, a monitor speaker integrates a miniature loudspeaker to play sound. In a typical miniature loudspeaker, a housing is fixed to the bottom of the frame, and a magnet is installed on the inner wall of the housing. Sound is generated through the interaction between the magnet and the coil. The magnet vibrates, converting electrical signals into sound signals. A washer is installed on the top of the magnet, which concentrates the magnetic field generated by the magnet into the space where the voice coil moves. A magnetic guide plate is installed on the surface of the magnet, which can efficiently guide the magnetic field of the magnet to the magnetic gap area, enhancing the magnetic field strength at the voice coil. A paper cone and a spider are fixedly connected to the inner wall of the frame. Driven by the voice coil current, the paper cone vibrates axially under the action of magnetic force, pushing the air to form sound waves. The spider ensures that the voice coil keeps its vertical movement in the magnetic gap, preventing deviation or friction, and ensuring the accuracy and stability of the sound, thereby achieving the effect of external sound projection.

[0003] Regarding the aforementioned technologies, the inventors believe that, in the use of conventional miniature loudspeakers, since the magnetic blocks inside conventional loudspeakers are mostly ring-shaped structures, the magnetic field is prone to being too central during actual use, resulting in a poor edge magnetic field. This causes uneven force on the voice coil, affects the linearity of the diaphragm movement, increases nonlinear distortion, and causes the loudspeaker to produce additional harmonic distortion when playing complex music signals.

[0004] The information disclosed in this background section is only intended to enhance the understanding of the background technology of this application, and therefore may include prior art that is not known to those skilled in the art. Utility Model Content

[0005] To address the problem of uneven magnetic field distribution affecting playback performance in miniature speakers, this application provides a miniature speaker structure with improved magnetic energy utilization.

[0006] The miniature loudspeaker structure with improved magnetic energy utilization provided in this application adopts the following technical solution:

[0007] A miniature loudspeaker structure for improving magnetic energy utilization includes a frame, on the inner wall of which a paper cone and a spring are fixedly mounted. The dimensions of the spring surface are adapted to the dimensions of the inner wall of the frame. A housing is fixedly connected to the bottom of the frame. A washer is fixedly mounted on the inner wall of the housing, and two main magnets are fixedly connected to the inner wall of the housing. Magnetic gaps are formed on the inner walls of the main magnets, and two auxiliary magnets are provided at both ends of the main magnets. Magnetic guide plates are movably mounted on the surfaces of the main magnets and auxiliary magnets. The center of the frame and the center of the housing are on the same straight line. The tops of the main magnets and auxiliary magnets are movably mounted to the bottom of the washer. The surface of the auxiliary magnet is fixedly connected to the inner wall of the housing.

[0008] Preferably, the main magnet is made of neodymium iron boron material, and the dimensions of the main magnet and the auxiliary magnet are compatible with the dimensions of the inner wall of the outer shell.

[0009] Preferably, the auxiliary magnet is ferrite, and the two auxiliary magnets are symmetrically distributed about the main magnet, with the auxiliary magnets having a "C" shaped structure.

[0010] Preferably, the paper basin is composed of an SOI substrate and a polyimide flexible film, and the dimensions of the paper basin surface are adapted to the dimensions of the inner wall of the basin frame.

[0011] Preferably, a shielding layer is fixedly installed on the inner wall of the outer shell, the size of the shielding layer surface is adapted to the size of the inner wall of the outer shell, and the shielding layer is made of nickel-zinc magnetic material.

[0012] Preferably, a plurality of connecting blocks are fixedly installed at the bottom of the washer, and the bottom of the connecting blocks are movably connected to the top of the main magnet and the auxiliary magnet, and the connecting blocks are permalloy blocks.

[0013] Preferably, a fixing block is fixedly installed between the plurality of connecting blocks. The fixing block is an epoxy resin block, and the size and specifications of the surface of the fixing block are adapted to the size and specifications of the plurality of connecting blocks.

[0014] In summary, this application includes the following beneficial technical effects:

[0015] 1. By installing a racetrack-shaped main magnet inside the housing, with auxiliary magnets at both ends of the main magnet, and magnetic gaps on the inner wall of the main magnet, the magnetic field distribution is made more uniform through the combination of the racetrack shape and the unbalanced magnetic field layout. The magnetic field utilization rate is improved by using both linear and ring-shaped magnetic gaps. The neodymium iron boron main magnet is installed on the inner wall of the housing to generate a stronger magnetic field, improving sensitivity and output power. Ferrite auxiliary magnets are installed on both sides of the main magnet to form a closed magnetic circuit with the main magnet. A paper cone composed of an SOI substrate and a polyimide flexible film is installed inside the frame to effectively improve energy conversion efficiency. Compared with existing technologies, this significantly improves the magnetic energy utilization rate of the speaker.

[0016] 2. A nickel-zinc magnetic shielding layer can also be installed on the inner wall of the outer casing. This shielding layer can convert high-frequency electromagnetic interference into heat energy through hysteresis loss, effectively blocking noise propagation. Several permalloy connecting blocks are installed at the bottom of the washer to connect the main magnet and auxiliary magnet to the washer, thus ensuring the connection of the magnetic fields generated by the main magnet and auxiliary magnet. Epoxy resin fixing blocks are installed between the connecting blocks to improve the stability of the connecting blocks after installation, effectively improving the performance of the device. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of a miniature loudspeaker structure with improved magnetic energy utilization according to an embodiment of the application.

[0018] Figure 2 This is a schematic diagram of the main magnet structure in an embodiment of the application;

[0019] Figure 3 This is a side view of the embodiment of the application.

[0020] Figure 4 This is a schematic diagram of the structure at point A in the embodiment of the application.

[0021] Explanation of reference numerals in the attached diagram: 1. Basin frame; 2. Paper basin; 3. Spring; 4. Washer; 5. Outer shell; 6. Main magnet; 7. Auxiliary magnet; 8. Magnetic gap; 9. Shielding layer; 10. Magnetic guide plate; 11. Connecting block; 12. Fixing block. Detailed Implementation

[0022] The following is in conjunction with the appendix Figure 1-4 This application will be described in further detail.

[0023] This application discloses a micro loudspeaker structure with improved magnetic energy utilization, referring to... Figure 1 - Figure 2The system includes a speaker frame 1. During use, a housing 5 is fixedly installed at the bottom of the speaker frame 1. A magnet is installed on the inner wall of the housing 5. Vibration is generated through the interaction between the magnet and the coil, thereby converting electrical signals into sound signals. A washer 4 is installed on the top of the magnet, concentrating the magnetic field generated by the magnet into the space where the voice coil moves. A magnetic guide plate 10 is installed on the surface of the magnet, efficiently guiding the magnetic field to the magnetic gap region and enhancing the magnetic field strength at the voice coil. A paper cone 2 and a spider 3 are fixedly connected to the inner wall of the speaker frame 1. The paper cone 2, driven by the voice coil current, is subjected to the magnetic field... The force generates axial vibration, which pushes the air to form sound waves. The spring wave 3 ensures that the voice coil maintains vertical movement in the magnetic gap, preventing deviation or friction and ensuring the accuracy and stability of the sound, thereby achieving the effect of external sound projection. The racetrack-shaped main magnet 6 is installed in the outer shell 5. Auxiliary magnets 7 are provided at both ends of the main magnet 6. Magnetic gaps 8 are opened on the inner wall of the main magnet 6. By combining the racetrack shape with the unbalanced magnetic field layout, the magnetic field distribution is made more uniform. By setting two types of magnetic gaps 8, namely linear and ring-shaped, the magnetic energy utilization rate of the speaker is effectively improved.

[0024] Reference Figure 2 The neodymium iron boron main magnet 6 is installed on the inner wall of the outer shell 5. The neodymium iron boron material of the main magnet 6 has extremely high magnetic energy product, coercivity and remanence, which generates a stronger magnetic field and significantly improves the voice coil driving force, thereby improving sensitivity and output power. The ferrite auxiliary magnet 7 is installed on both sides of the main magnet 6. The ferrite auxiliary magnet 7 and the main magnet 6 form a closed magnetic circuit. The paper cone 2, which is composed of SOI substrate and polyimide flexible film, is installed in the frame 1. The paper cone 2, SOI substrate and polyimide flexible film have the characteristics of being lightweight and highly elastic, which effectively improves the energy conversion efficiency.

[0025] Reference Figure 3 - Figure 4 A nickel-zinc magnetic shielding layer 9 is installed on the inner wall of the outer casing 5. The nickel-zinc magnetic material of the shielding layer 9 has high magnetic permeability and converts high-frequency electromagnetic interference into heat energy through hysteresis loss, effectively blocking noise propagation. Several permalloy connecting blocks 11 are installed at the bottom of the washer 4. The permalloy material of the connecting blocks 11 has high magnetic permeability, low coercivity and excellent magnetic properties, which facilitates the connection of the main magnet 6 and the auxiliary magnet 7 to the washer 4, thereby ensuring that the magnetic fields generated by the main magnet 6 and the auxiliary magnet 7 are connected. Epoxy resin fixing blocks 12 are installed between the connecting blocks 11. The fixing blocks 12 fix the connecting blocks 11 to the top of the main magnet 6 and the auxiliary magnet 7, effectively improving the stability of the connecting blocks 11 after installation.

[0026] The implementation principle of a miniature loudspeaker structure with improved magnetic energy utilization in this application embodiment is as follows: A racetrack-shaped main magnet 6 is installed inside a housing 5. Auxiliary magnets 7 are provided at both ends of the main magnet 6. Magnetic gaps 8 are formed on the inner wall of the main magnet 6. This allows for a more uniform magnetic field distribution by combining the racetrack shape with an unbalanced magnetic field layout. The magnetic field utilization is improved by setting both linear and ring-shaped magnetic gaps 8. The neodymium iron boron (NdFeB) main magnet 6 is installed on the inner wall of the housing 5 to facilitate the utilization of the NdFeB material in the main magnet 6. The material has extremely high magnetic energy product, coercivity, and remanence, generating a stronger magnetic field and significantly improving the voice coil driving force, thereby increasing sensitivity and output power. Ferrite auxiliary magnets 7 are installed on both sides of the main magnet 6 so that they can form a closed magnetic circuit with the main magnet 6. The paper cone 2, which is composed of SOI substrate and polyimide flexible film, is installed in the frame 1 so that the paper cone 2 can effectively improve the energy conversion efficiency by taking advantage of the lightweight and highly elastic properties of SOI substrate and polyimide flexible film.

[0027] A nickel-zinc magnetic shielding layer 9 can also be installed on the inner wall of the outer casing 5. The high permeability of the nickel-zinc magnetic material in the shielding layer 9 allows high-frequency electromagnetic interference to be converted into heat energy through hysteresis loss, effectively blocking noise propagation. Several permalloy connecting blocks 11 are installed at the bottom of the washer 4. The high permeability, low coercivity, and excellent magnetic properties of the permalloy material in the connecting blocks 11 facilitate the connection of the main magnet 6 and the auxiliary magnet 7 with the washer 4, thereby ensuring the connection of the magnetic fields generated by the main magnet 6 and the auxiliary magnet 7. Epoxy resin fixing blocks 12 are installed between the connecting blocks 11 to fix the connecting blocks 11 to the top of the main magnet 6 and the auxiliary magnet 7, effectively improving the stability of the connecting blocks 11 after installation.

[0028] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A micro speaker structure for improving the utilization of magnetic energy, comprising a yoke (1), characterized in that: The inner wall of the basin stand (1) is fixedly installed with a paper basin (2) and a spring (3). The size of the surface of the spring (3) is compatible with the size of the inner wall of the basin stand (1). The bottom of the basin stand (1) is fixedly connected with an outer shell (5). The inner wall of the outer shell (5) is fixedly installed with a washer (4). The inner wall of the outer shell (5) is fixedly connected with two main magnets (6). The inner wall of the main magnets (6) is provided with a magnetic gap (8). The two ends of the main magnets (6) are provided with two auxiliary magnets (7). The surfaces of the main magnets (6) and the auxiliary magnets (7) are movably installed with magnetic plates (10).

2. The micro speaker structure for improving the utilization of magnetic energy according to claim 1, wherein: The center of the basin stand (1) and the center of the outer shell (5) are on the same straight line. The tops of the main magnet (6) and the auxiliary magnet (7) are movably installed at the bottom of the washer (4). The surface of the auxiliary magnet (7) is fixedly connected to the inner wall of the outer shell (5).

3. The micro speaker structure for improving the utilization of magnetic energy according to claim 1, wherein: The main magnet (6) is made of neodymium iron boron material, and the dimensions of the main magnet (6) and the auxiliary magnet (7) are compatible with the dimensions of the inner wall of the outer shell (5).

4. The micro speaker structure for improving the utilization of magnetic energy according to claim 1, wherein: The auxiliary magnet (7) is made of ferrite. The two auxiliary magnets (7) are symmetrically distributed about the main magnet (6) and the auxiliary magnets (7) have a "C" shaped structure.

5. The micro speaker structure for improving the utilization of magnetic energy according to claim 1, wherein: The paper basin (2) is composed of an SOI substrate and a polyimide flexible film, and the dimensions of the surface of the paper basin (2) are adapted to the dimensions of the inner wall of the basin frame (1).

6. The micro speaker structure for improving the utilization of magnetic energy according to claim 1, wherein: The inner wall of the outer shell (5) is fixedly installed with a shielding layer (9). The size of the shielding layer (9) is compatible with the size of the inner wall of the outer shell (5), and the shielding layer (9) is made of nickel-zinc magnetic material.

7. The micro speaker structure for improving the utilization of magnetic energy according to claim 1, wherein: Several connecting blocks (11) are fixedly installed at the bottom of the washer (4), and the bottom of the connecting blocks (11) are movably connected to the top of the main magnet (6) and the auxiliary magnet (7).

8. The micro speaker structure for improving the utilization of magnetic energy according to claim 7, wherein: A fixing block (12) is fixedly installed between several connecting blocks (11). The fixing block (12) is an epoxy resin block, and the size of the surface of the fixing block (12) is compatible with the size of the connecting blocks (11).

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