Search

CN-122002194-A - Acoustic device and electronic apparatus

CN122002194ACN 122002194 ACN122002194 ACN 122002194ACN-122002194-A

Abstract

The invention belongs to the technical field of electroacoustic conversion, and particularly relates to an acoustic device and electronic equipment, wherein the acoustic device comprises a vibration system and a magnetic circuit system, the vibration system comprises a vibrating diaphragm assembly and a voice coil which are connected, the magnetic circuit system comprises a magnetic yoke, a central magnetic part and a side magnetic part, the central magnetic part and the side magnetic part are arranged on the same side face of the magnetic yoke, the side magnetic part is annularly arranged on the central magnetic part and forms a magnetic gap for the voice coil to extend in, the central magnetic part comprises a first central magnet, a second central magnet and a central magnetic conduction plate, the side magnetic part comprises a first side magnet, a second side magnet and a side magnetic conduction plate, the magnetizing directions of the first central magnet and the first side magnet are inclined relative to the vibrating direction of the vibrating diaphragm assembly, and the magnetizing directions of the second central magnet and the second side magnet are perpendicular to the vibrating direction. The structure can improve the BL value of the acoustic device, further reduce distortion and improve the acoustic performance of the acoustic device.

Inventors

  • CAO MINGJUN
  • GUO YANG
  • CAI XIAODONG

Assignees

  • 歌尔股份有限公司

Dates

Publication Date
20260508
Application Date
20251222

Claims (10)

  1. 1. An acoustic device, comprising: the vibration system comprises a vibrating diaphragm assembly and a voice coil which are connected; The magnetic circuit comprises a magnetic yoke, a central magnetic part and a side magnetic part, wherein the central magnetic part and the side magnetic part are arranged on the same side surface of the magnetic yoke, the side magnetic part is arranged on the periphery of the central magnetic part and forms a magnetic gap with the central magnetic part, the voice coil can extend into the magnetic gap, the central magnetic part comprises a first central magnet, a second central magnet and a central magnetic guide plate, the second central magnet and the central magnetic guide plate are distributed along the radial direction of the magnetic circuit and are overlapped on the first central magnet, the second central magnet is positioned on one side of the central magnetic guide plate far away from the magnetic gap, the side magnetic part comprises a first side magnet, a second side magnet and a side magnetic guide plate, the second side magnet and the side magnetic guide plate are distributed along the radial direction of the magnetic circuit and are overlapped on the first side magnet, and the second side magnet is positioned on one side of the side magnetic guide plate far away from the magnetic gap, wherein the side of the side magnetic circuit is provided with the magnetic coil The magnetizing directions of the first center magnet and the first side magnet are inclined relative to the vibrating direction of the vibrating diaphragm assembly, the polarities of the magnetic poles at one end far away from the magnetic conduction yoke are opposite, the magnetizing directions of the second center magnet and the second side magnet are perpendicular to the vibrating direction, the polarities of the magnetic poles of the second center magnet, which face one end of the center magnetic conduction plate, are identical to those of the magnetic poles of the first center magnet, which face one end of the magnetic conduction yoke, and the polarities of the magnetic poles of the second side magnet, which face one side of the side magnetic conduction plate, are identical to those of the magnetic poles of the first side magnet, which face one end of the magnetic conduction yoke.
  2. 2. The acoustic device of claim 1, wherein the magnetization directions of the first center magnet and the first side magnet are inclined at an angle of greater than 0 ° and less than or equal to 54 ° with respect to the vibration direction of the diaphragm assembly.
  3. 3. The acoustic device of claim 2, wherein the magnetization directions of the first center magnet and the first side magnet are inclined at an angle of 18 ° with respect to the vibration direction of the diaphragm assembly.
  4. 4. An acoustic device according to claim 1, wherein the width ratio of the side magnetically permeable plate and the second side magnet is 1 (0.5-4) in the radial direction of the magnetic circuit.
  5. 5. The acoustic device of claim 4, wherein the width ratio of the side magnetically permeable plate to the second side magnet is 1:1 in the radial direction of the magnetic circuit.
  6. 6. The acoustic device of claim 1, wherein the first center magnet includes a plurality of center magnets and is disposed at intervals along a circumferential direction of the magnetic circuit system, and the center magnetically permeable plate and the second center magnet include a plurality of center magnets and are disposed in correspondence with the first center magnet.
  7. 7. The acoustic device of claim 6, wherein the magnetic gap is rectangular and annular, the first center magnet comprises a pair of first sub-magnets arranged corresponding to long sides of the magnetic gap and a pair of second sub-magnets arranged corresponding to short sides of the magnetic gap, the center magnetically permeable plate comprises a first center magnetically permeable plate arranged on the first sub-magnets and a second center magnetically permeable plate arranged on the second sub-magnets, wherein the first center magnetically permeable plate and the second center magnetically permeable plate are integrally formed or separately arranged; And/or the first center magnets comprise four, and each first center magnet is approximately triangular prism-shaped and surrounds a rectangle.
  8. 8. The acoustic device of claim 1, further comprising a housing, one side of the housing being connected to the diaphragm assembly and the other side of the housing being connected to the side magnetic portion along an axial direction of the housing.
  9. 9. The acoustic device of claim 8, wherein the diaphragm assembly comprises a diaphragm and a diaphragm disposed around the diaphragm, wherein an outer edge of the diaphragm is connected to the housing, and wherein one end of the voice coil is connected to the diaphragm, and the other end extends into the magnetic gap.
  10. 10. An electronic device comprising an acoustic device according to any one of claims 1-9.

Description

Acoustic device and electronic apparatus Technical Field The invention belongs to the technical field of electroacoustic conversion, and particularly relates to an acoustic device and electronic equipment. Background BL performance, which is one of the core parameters for measuring electroacoustic conversion efficiency of a loudspeaker, is a key to the development of many electroacoustic technologies currently, and is directly related to sensitivity, sound quality and power processing capability of the loudspeaker. At present, one of the technical challenges is contradiction between miniaturization and high performance, the requirements on the internal space of equipment are severe, the size of a magnetic circuit is limited, and BL performance is difficult to be high. Therefore, how to improve the BL performance of an acoustic device in a limited space is a technical problem that needs to be solved currently. Disclosure of Invention The invention aims to provide an acoustic device and an electronic device, so as to at least partially solve the technical problems. The present invention provides an acoustic device comprising: the vibration system comprises a vibrating diaphragm assembly and a voice coil which are connected; The magnetic circuit comprises a magnetic yoke, a central magnetic part and a side magnetic part, wherein the central magnetic part and the side magnetic part are arranged on the same side surface of the magnetic yoke, the side magnetic part is arranged on the periphery of the central magnetic part and forms a magnetic gap with the central magnetic part, the voice coil can extend into the magnetic gap, the central magnetic part comprises a first central magnet, a second central magnet and a central magnetic guide plate, the second central magnet and the central magnetic guide plate are distributed along the radial direction of the magnetic circuit and are overlapped on the first central magnet, the second central magnet is positioned on one side of the central magnetic guide plate far away from the magnetic gap, the side magnetic part comprises a first side magnet, a second side magnet and a side magnetic guide plate, the second side magnet and the side magnetic guide plate are distributed along the radial direction of the magnetic circuit and are overlapped on the first side magnet, and the second side magnet is positioned on one side of the side magnetic guide plate far away from the magnetic gap, wherein the side of the side magnetic circuit is provided with the magnetic coil The magnetizing directions of the first center magnet and the first side magnet are inclined relative to the vibrating direction of the vibrating diaphragm assembly, the polarities of the magnetic poles at one end far away from the magnetic conduction yoke are opposite, the magnetizing directions of the second center magnet and the second side magnet are perpendicular to the vibrating direction, the polarities of the magnetic poles of the second center magnet, which face one end of the center magnetic conduction plate, are identical to those of the magnetic poles of the first center magnet, which face one end of the magnetic conduction yoke, and the polarities of the magnetic poles of the second side magnet, which face one side of the side magnetic conduction plate, are identical to those of the magnetic poles of the first side magnet, which face one end of the magnetic conduction yoke. The acoustic device provided by the invention can also have the following additional technical characteristics: in one embodiment of the present invention, the magnetizing directions of the first center magnet and the first side magnet are inclined at an angle of greater than 0 ° and less than or equal to 54 ° with respect to the vibration direction of the diaphragm assembly. In one embodiment of the present invention, the magnetizing directions of the first center magnet and the first side magnet are inclined at an angle of 18 ° with respect to the vibration direction of the diaphragm assembly. In one specific embodiment of the invention, the width ratio of the side magnetic conduction plate to the second side magnet is 1 (0.5-4) along the radial direction of the magnetic circuit system. In one specific embodiment of the present invention, the width ratio of the side magnetic conduction plate to the second side magnet is 1:1 along the radial direction of the magnetic circuit system. In one specific embodiment of the present invention, the first center magnet includes a plurality of first center magnets and is disposed at intervals along a circumferential direction of the magnetic circuit system, and the center magnetic conductive plate and the second center magnet include a plurality of second center magnets and are disposed corresponding to the first center magnets. In one specific embodiment of the invention, the magnetic gap is rectangular and annular, the first center magnet comprises a pair of first sub magnets arranged corres