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EP-4475557-B1 - LOUDSPEAKER MODULE AND ELECTRONIC DEVICE

EP4475557B1EP 4475557 B1EP4475557 B1EP 4475557B1EP-4475557-B1

Inventors

  • GUO, LI
  • QIN, RENXUAN
  • LIU, YANG
  • PANG, Lichen
  • SHAN, Tingjia

Dates

Publication Date
20260506
Application Date
20230327

Claims (13)

  1. A speaker module (30), comprising a housing (80) and a speaker, wherein the housing (80) has mounting space (41), the speaker is fastened in the mounting space (41), and divides the mounting space (41) into first space (411) and second space (412), and when the speaker works, a first sound wave is formed in the first space (411), and a second sound wave is formed in the second space (412), wherein the second sound wave and the first sound wave have equal amplitudes and opposite phases; the housing (80) further has a first sound emitting hole and a second sound emitting hole that are disposed opposite to each other, the first sound emitting hole communicates with the first space (411), and the second sound emitting hole communicates with the second space (412); and the housing (80) further has a third sound emitting hole and an inverter cavity (45), one end of the inverter cavity communicates with the second space (412), the other end of the inverter cavity communicates with the third sound emitting hole, the inverter cavity (45) is configured to form a third sound wave at the third sound emitting hole when the speaker works, a phase of the third sound wave is the same as a phase of the first sound wave, and the third sound wave is superposed with the first sound wave passing through the first sound emitting hole; wherein the speaker comprises a base (31, 51), a vibration assembly (32, 52), and a magnetic circuit assembly (33); the base (31, 51) has an inner cavity (311, 511); the magnetic circuit assembly (33) is disposed in the inner cavity (311, 511), and the magnetic circuit assembly (33) has a magnetic gap (333, 3331, 3332); the vibration assembly (32, 52) comprises a first diaphragm (321), a second diaphragm (322), and a voice coil (323), wherein the first diaphragm (321) and the second diaphragm (322) are respectively located on two opposite sides of the magnetic circuit assembly (33), circumferential edges of the first diaphragm (321) and the second diaphragm (322) are connected to the base (31, 51), the voice coil (323) is located inside the magnetic gap (333, 3331, 3332), and two opposite sides of the voice coil (323) are respectively connected to the first diaphragm (321) and the second diaphragm (322); and one of the first diaphragm (321) and the second diaphragm (322) faces the first space (411), and the other faces the second space (412); and wherein the voice coil (323) comprises a first end face (3234) and a second end face (3235) that are disposed opposite to each other, both the first end face (3234) and the second end face (3235) are perpendicular to a central axis of the voice coil (323), the first end face (3234) is connected to the first diaphragm (321), and the second end face (3235) is connected to the second diaphragm (322).
  2. The speaker module (30) according to claim 1, wherein a sound emitting direction of the third sound emitting hole is the same as a sound emitting direction of the first sound emitting hole.
  3. The speaker module (30) according to claim 1, wherein the third sound wave produces resonance in a frequency band range of 50 Hz to 200 Hz.
  4. The speaker module (30) according to claim 1, wherein the voice coil (323) comprises a first side part (3231) and a second side part (3232) that are disposed opposite to each other, both the first side part (3231) and the second side part (3232) are parallel to a central axis of the voice coil (323), the first side part (3231) is connected to the first diaphragm (321), and the second side part (3232) is connected to the second diaphragm (322); and wherein the magnetic circuit assembly (33) comprises a first part and a second part, both the first part and the second part are magnetic, the first part and the second part are spaced from each other, and the magnetic gap (333, 3331, 3332) is formed between the first part and the second part.
  5. The speaker module (30) according to any one of claims 1 to 4, wherein there are a plurality of voice coils (323), and the plurality of voice coils (323) are arranged in a length direction of the speaker.
  6. The speaker module (30) according to claim 5, wherein the magnetic gap (333, 3331, 3332) extends in the length direction of the speaker, and the plurality of voice coils (323) are arranged at intervals in the magnetic gap (333, 3331, 3332); or the speaker comprises a plurality of magnetic gaps (333, 3331, 3332), the plurality of magnetic gaps (333, 3331, 3332) are provided at intervals in the length direction of the speaker, and the plurality of voice coils (323) are located inside the plurality of magnetic gaps (333, 3331, 3332) in a one-to-one correspondence.
  7. The speaker module (30) according to any one of claims 1 to 4, wherein the first diaphragm (321) and the second diaphragm (322) are symmetrically disposed relative to the magnetic circuit assembly (33).
  8. A speaker module (30), comprising a housing (80) and a speaker, wherein the housing (80) has mounting space (41), the speaker is fastened in the mounting space (41), and divides the mounting space (41) into first space (411) and second space (412), and when the speaker works, a first sound wave is formed in the first space (411), and a second sound wave is formed in the second space (412), wherein the second sound wave and the first sound wave have equal amplitudes and opposite phases; the housing (80) further has a first sound emitting hole and a second sound emitting hole that are disposed opposite to each other, the first sound emitting hole communicates with the first space (411), and the second sound emitting hole communicates with the second space (412); and the housing (80) further has a third sound emitting hole and an inverter cavity (45), one end of the inverter cavity communicates with the second space (412), the other end of the inverter cavity communicates with the third sound emitting hole, the inverter cavity (45) is configured to form a third sound wave at the third sound emitting hole when the speaker works, a phase of the third sound wave is the same as a phase of the first sound wave, and the third sound wave is superposed with the first sound wave passing through the first sound emitting hole; wherein the speaker comprises a base (31, 51), a vibration assembly (32, 52), a first magnetic circuit assembly (34, 53), and a second magnetic circuit assembly (35, 54), the base (31, 51) has an inner cavity (311, 511), the vibration assembly (32, 52) is disposed in the inner cavity (311, 511), and the first magnetic circuit assembly (34, 53) and the second magnetic circuit assembly (35, 54) are respectively located on two sides of the vibration assembly (32, 52) and are symmetrically disposed relative to the vibration assembly (32, 52); the vibration assembly (32, 52) comprises a diaphragm (321, 322, 521), a first voice coil (522), and a second voice coil (523), the diaphragm (321, 322, 521), the first voice coil (522), and the second voice coil (523) are stacked in a first direction, the diaphragm (321, 322, 521) comprises a first surface (5211) and a second surface (5212) that are disposed opposite to each other in the first direction, and the diaphragm (321, 322, 521) divides the inner cavity (311, 511) into a first sound cavity (5112) and a second sound cavity (5113); the first voice coil (522) is fastened to the first surface (5211), and the second voice coil (523) is fastened to the second surface (5212); the first magnetic circuit assembly (34, 53) and the second magnetic circuit assembly (35, 54) are respectively located in the first sound cavity (5112) and the second sound cavity (5113); and the first sound cavity communicates with the first space (411), and the second sound cavity communicates with the second space (412).
  9. The speaker module (30) according to claim 8, wherein a projection of the first voice coil (522) on the first surface (5211) is a ring, a height of the first voice coil (522) in the first direction is a first height, a distance between the first magnetic circuit assembly (34, 53) and the first surface (5211) is a first distance, and the first height is greater than the first distance; and/or a projection of the second voice coil (523) on the second surface (5212) is a ring, a height of the second voice coil (523) in the first direction is a second height, a distance between the second magnetic circuit assembly (35, 54) and the second surface (5212) is a second distance, and the second height is greater than the second distance.
  10. The speaker module (30) according to claim 8, wherein the first voice coil (522) and the second voice coil (523) are symmetrically disposed relative to the diaphragm (321, 322, 521), and the first magnetic circuit assembly (34, 53) and the second magnetic circuit assembly (35, 54) are symmetrically disposed relative to the diaphragm (321, 322, 521).
  11. The speaker module (30) according to any one of claims 8 to 10, wherein the base (31, 51) comprises a frame body (111, 312, 512), a first cover plate (313, 513), and a second cover plate (314, 514), the first cover plate (313, 513) and the second cover plate (314, 514) respectively cover two opposite sides of the frame body (111, 312, 512), the diaphragm (321, 322, 521) is connected to inside of the frame body (111, 312, 512), the first magnetic circuit assembly (34, 53) and the second magnetic circuit assembly (35, 54) are respectively connected to the first cover plate (313, 513) and the second cover plate (314, 514), the first cover plate (313, 513) comprises a first sound outlet hole (5131), the second cover plate (314, 514) comprises a second sound outlet hole (5141), and the first sound outlet hole (5131) and the second sound outlet hole (5141) are symmetrical relative to the diaphragm (321, 322, 521); and the first sound outlet hole (5131) communicates with the first space (411), and the second sound outlet hole (5141) communicates with the second space (412).
  12. The speaker module (30) according to any one of claims 8 to 10, wherein the first magnetic circuit assembly (34, 53) comprises a first gap (5313), the second magnetic circuit assembly (35, 54) comprises a second gap (5412), the first gap (5313) and the second gap (5412) are symmetrically disposed relative to the diaphragm (321, 322, 521), the first voice coil (522) extends at least partially into the first gap (5313), and the second voice coil (523) extends at least partially into the second gap (5412).
  13. An electronic device (1000), wherein the electronic device (1000) comprises a housing (80) and the speaker module (30) according to any one of claims 1 to 7 or any one of claims 8 to 12, the housing (80) has a first sound output hole (13) and a second sound output hole (14), the speaker module (30) is mounted inside the housing (80), both a first sound emitting hole and a third sound emitting hole of the speaker module communicate with the first sound output hole (13), and a second sound emitting hole of the speaker module communicates with the second sound output hole (14).

Description

TECHNICAL FIELD The following technical description generally relates to the field of audio technologies. The invention in particular relates to a speaker module and an electronic device. BACKGROUND As a common electro-acoustic transducer, a speaker is widely used in various electronic devices (for example, terminals such as mobile phones and smart glasses). For example, when the speaker is used in smart glasses, the speaker may be disposed in a glasses temple of the smart glasses, and is different from an in-ear device like a headset. When the speaker is disposed in the glasses temple of the smart glasses, there is a large distance between the speaker and an ear canal, and propagation of a sound wave in air is non-directional. Therefore, the speaker disposed in the glasses temple has low loudness and a sound leakage in a use process. Hereinafter, some published patent prior art is described which discloses further technological background for further contributing to the understanding of the present invention as described further below. CN 108566606 A discloses a sound production device, and a portable terminal. The sound production device comprises a first vibration system, wherein the first vibration system comprises a skeleton voice coil, the skeleton voice coil is arranged on the inner side of a first diaphragm, the skeleton voice coil is fixedly connected with the first diaphragm, the skeleton voice coil comprises a skeleton, and a voice coil main body formed by twining a voice coil lead on the skeleton, and one end of the skeleton away from the first diaphragm at least partially protrudes from the voice coil main body;a second vibration system comprising a second diaphragm arranged to be opposite to the first diaphragm; and a magnetic circuit system arranged between the first diaphragm and the second diaphragm, wherein the magnetic circuit system is provided with an evasion portion; and one end of the skeleton away from the first diaphragm can movably penetrate through the evasion portion and is fixedly connected with the second diaphragm. According to the sound production device disclosed in this document, the volume occupied by a structure for realizing two-way sound production is small, so that the soundproduction device can be widely applied to portable terminals. CN 113556655 A discloses an intelligent head-mounted device. The intelligent head-mounted device comprises a device shell and a loudspeaker module installed in the device shell, wherein the device shell is provided with a front sound outlet hole and a rear sound outlet hole; the loudspeaker module comprises a module shell and a loudspeaker individual; the module shell is provided therein with an installation space; the module shell is provided with a sound outlet hole and a sound leakage hole; the sound outlet hole is in communication with the front sound outlet hole; the sound leakage hole is in communication with the rear sound outlet hole; the loudspeaker individual is arranged in the installation space and comprises a vibrating diaphragm capable of vibrating to produce sound; an effective volume on a path from a first side of the vibrating diaphragm to the sound outlet hole forms a front sound cavity; an effective volume on a path from a second side of the vibrating diaphragm to the sound leakage hole forms a rear sound cavity; the volume of the front sound cavity and the volume of the rear sound cavity meet the relational expression that/is larger than or equal to and smaller than or equal to 5. CN 112770232 A discloses a miniature loudspeaker comprising an upper shell, a lower shell covering the upper shell and a loudspeaker unit fixed between the upper shell and the lower shell, the upper shell is divided into a front sound cavity and a rear sound cavity through a vibrating diaphragm of the loudspeaker unit, and the upper shell is provided with a first sound outlet hole communicated with the front sound cavity. The upper shell is further provided with a second sound outlet hole, an inverted sound channel is arranged between the upper shell and the lower shell, one end of the inverted sound channel is communicated with the rear sound cavity, and the other end of the inverted sound channel is communicated to the second sound outlet hole; sound waves generated by the vibrating diaphragm which is forced to vibrate in the front vocal cavity are radiated to the outside through the front vocal cavity and the first sound outlet hole, and sound waves generated by the vibrating diaphragm in the rear vocal cavity are radiated to the outside through the rear vocal cavity, the inverted sound channel and the second sound outlet hole or then radiated to the outside through the first sound outlet hole. US 2020/275189 A1 discloses a speaker comprising a frame; a first magnetic body and a second magnetic body each coupled to the frame and spaced apart by a predetermined distance from each other to form a gap, wherein the first magnetic body and the