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CN-120568255-B - Micro-speaker and speaker assembly thereof

CN120568255BCN 120568255 BCN120568255 BCN 120568255BCN-120568255-B

Abstract

The invention relates to the technology of sound equipment, and provides a miniature loudspeaker which comprises a loudspeaker assembly and a sound absorption assembly. The loudspeaker assembly comprises a vibrating diaphragm and a paper cylinder, and a second ball groove is formed in the tail end of the paper cylinder. The sound absorption assembly comprises a fixed cavity and an induction unit, wherein the induction unit improves the sound absorption coefficient at low frequency and suppresses the sound absorption coefficient at high frequency. At a low frequency, the current of the induction coil is increased, the magnetic field intensity of the induction coil is increased, the viscosity of the magnetorheological fluid is increased, and the sound absorption coefficient is improved, and at a high frequency, the current of the induction coil is reduced, the magnetic field intensity of the induction coil is reduced, the viscosity of the magnetorheological fluid is reduced, the sound absorption coefficient is reduced, and the sound absorption requirement of a target frequency band is precisely matched. The invention also proposes a loudspeaker assembly consisting of one or more micro-loudspeakers.

Inventors

  • CHEN ZEMIN

Assignees

  • 东莞佳蓝电子科技有限公司

Dates

Publication Date
20260512
Application Date
20250606

Claims (10)

  1. 1. A micro-speaker, comprising: the loudspeaker assembly comprises a vibrating diaphragm and a paper cylinder, and a second ball groove is formed in the tail end of the paper cylinder; The sound absorption assembly comprises a fixed cavity and an induction unit, the induction unit improves the sound absorption coefficient at low frequency and suppresses the sound absorption coefficient at high frequency, Porous sound absorption materials are filled between the fixed cavity and the induction unit, the induction unit comprises a stator disc, the stator disc comprises a main body frame, a plurality of accommodating cavities are arranged on the main body frame, flexible materials are arranged on the outer sides of the accommodating cavities, A plurality of iron cores are circumferentially equidistantly arranged on the inner diameter of the stator disc, induction coils are wound on the iron cores, a permanent magnet turntable is arranged in the middle of the stator disc, a first ball groove is arranged in the middle of the permanent magnet turntable, The second ball groove penetrates through the middle of the permanent magnet turntable and is matched with the first ball groove, and when the paper cylinder vibrates, the first ball groove and the second ball groove drive the permanent magnet turntable to rotate.
  2. 2. The micro-speaker of claim 1, wherein the induction coil is composed of a first coil and a second coil, the first coil and the second coil are connected in series, the second coil is located in the accommodating cavity, and magnetorheological fluid is filled in the accommodating cavity.
  3. 3. The micro-speaker of claim 2, wherein the induction coil generates a current at a low frequency that is greater than at a high frequency, Wherein, the At low frequency, the current of the induction coil is increased, the magnetic field intensity of the induction coil is increased, the viscosity of magnetorheological fluid is improved, and the sound absorption coefficient is improved; At high frequency, the current of the induction coil is reduced, the magnetic field intensity of the induction coil is reduced, the viscosity of the magnetorheological fluid is reduced, and the sound absorption coefficient is reduced.
  4. 4. A micro-speaker according to claim 1 or 3, wherein the diaphragm has a lower frequency displacement than a higher frequency displacement, and wherein the diaphragm is rotated by the paper tube, the first ball groove and the second ball groove at a lower frequency than a higher frequency.
  5. 5. The micro-speaker of claim 1, wherein the speaker assembly further comprises a speaker disc, the speaker disc is circumferentially provided with a plurality of sound absorption cavities, a plurality of sound guide holes are arranged below the sound absorption cavities, and a sound absorption assembly is arranged below the sound guide holes.
  6. 6. The micro-speaker of claim 1, wherein the flexible material is in communication with the stationary chamber and the inductive element filled with a porous sound absorbing material.
  7. 7. The micro-speaker of claim 1, wherein the permanent magnet turntable comprises a first permanent magnet disk and a second permanent magnet disk, and teeth of the first permanent magnet disk and teeth of the second permanent magnet disk are staggered with each other.
  8. 8. The micro-speaker of claim 1, wherein the speaker assembly comprises a voice coil and a base, the base comprises a permanent magnet, a hole is provided in the middle of the permanent magnet, a first iron plate and a second iron plate are provided on the upper and lower surfaces of the permanent magnet, and a cylindrical boss is provided in the middle of the second iron plate.
  9. 9. The micro-speaker of claim 8, wherein the sound amplifying ring comprises a sound amplifying disk, a vibrating diaphragm is arranged in the sound amplifying disk, a paper tube is fixedly connected to the middle of the vibrating diaphragm, and a copper coil is arranged at the lower end of the paper tube.
  10. 10. A speaker assembly comprising the micro-speaker of claim 1.

Description

Micro-speaker and speaker assembly thereof Technical Field The present invention relates to audio equipment, and more particularly, to a micro speaker and a speaker assembly thereof. Background The speaker converts an electric signal into mechanical vibration by electromagnetic induction, thereby generating sound waves. Because of the longer wavelength of the bass sound wave, interference with external low frequency noise may occur in a larger space, resulting in enhancement or attenuation of sound at certain frequencies. In the speaker noise control technology, the active and passive composite sound absorption technology has obvious advantages in the aspect of widening low-frequency sound absorption bandwidth by combining a passive sound absorption material with an active acoustic regulation and control system. However, there are still a number of limitations to the prior art. The traditional active and passive series composite sound absorption structure has huge whole volume due to the stacking design of passive material layers and an active control unit, and is difficult to meet the application requirement of compact space, and the semi-active sound absorption and active impedance control method needs to carry out high-precision modeling and real-time identification on mechanical parameters, such as diaphragm displacement characteristics and electrical parameters, of each loudspeaker. In addition, the traditional active sound absorption system needs to be provided with a large number of loudspeaker units to realize large-area sound field regulation and control, thereby further restricting the engineering applicability. In order to solve the above problems, in the prior art, the performance of the speaker is optimized by dynamic control of the displacement of the diaphragm, and in the chinese patent application CN114390406a, the displacement prediction accuracy is improved by adjusting the correction coefficient, but the core contradiction between the volume and the cost of the sound absorption structure is still not solved. Especially, the coupling design of the active unit and the passive layer in the traditional series structure is easy to cause acoustic impedance mismatch, so that low-frequency sound absorption efficiency is limited, and the complexity of the system is increased by the multi-unit layout. Therefore, a new active and passive composite sound absorption configuration is needed, which can break through the bottleneck of low-frequency sound absorption performance and realize compact and low-cost deployment. In addition, in the existing sound field control theory, the influence of the high-order mode sound field on the sound absorption performance is often simplified, and the layout of the error microphone lacks systematic optimization basis, so that the stability of the sound absorption frequency band is insufficient in practical application. How to maximize broadband sound absorption efficiency in a limited volume through accurate sound field modeling and impedance matching design is still a difficult technical difficulty in the field. Disclosure of Invention Based on the technical problems, the invention provides a micro-speaker and a speaker assembly thereof. The technical scheme of the invention is realized as follows: A micro-speaker, comprising: the loudspeaker assembly comprises a vibrating diaphragm and a paper cylinder, and a second ball groove is formed in the tail end of the paper cylinder; The sound absorption assembly comprises a fixed cavity and an induction unit, the induction unit improves the sound absorption coefficient at low frequency and suppresses the sound absorption coefficient at high frequency, Porous sound absorption materials are filled between the fixed cavity and the induction unit, the induction unit comprises a stator disc, the stator disc comprises a main body frame, a plurality of accommodating cavities are arranged on the main body frame, flexible materials are arranged on the outer sides of the accommodating cavities, A plurality of iron cores are circumferentially equidistantly arranged on the inner diameter of the stator disc, induction coils are wound on the iron cores, a permanent magnet turntable is arranged in the middle of the stator disc, a first ball groove is arranged in the middle of the permanent magnet turntable, The second ball groove penetrates through the middle of the permanent magnet turntable and is matched with the first ball groove, and when the paper cylinder vibrates, the first ball groove and the second ball groove drive the permanent magnet turntable to rotate. In the invention, the induction coil consists of a first coil and a second coil, wherein the first coil and the second coil are mutually connected in series, and the second coil is positioned in the accommodating cavity, wherein magnetorheological fluid is filled in the accommodating cavity. In the invention, when the current generated by the induction coil is higher at low