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US-20260129347-A1 - EARPHONES

US20260129347A1US 20260129347 A1US20260129347 A1US 20260129347A1US-20260129347-A1

Abstract

An earphone is provided. The first speaker includes a first diaphragm. The first diaphragm and a core housing cooperate to form a first front cavity and a first rear cavity located on two sides of the first diaphragm. The second speaker includes a second diaphragm and a speaker housing. The second diaphragm, the speaker housing, and the core housing cooperate to form a second front cavity and a second rear cavity located on two sides of the second diaphragm. The core housing is provided with a first sound outlet for guiding a sound from the first front cavity to outside of the core housing and a second sound outlet for guiding a sound from the second front cavity to the outside of the core housing. The second speaker is further provided with a communication hole for communicating the second rear cavity with outside of the second speaker.

Inventors

  • Jianing LIANG
  • Lei Zhang
  • Xin Qi

Assignees

  • Shenzhen Shokz Co., Ltd.

Dates

Publication Date
20260507
Application Date
20251229

Claims (20)

  1. 1 . An earphone, comprising: a core housing, a first speaker, a second speaker, and a driving circuit, wherein the core housing accommodates the first speaker and the second speaker; the driving circuit is configured to drive the first speaker and the second speaker; at least a portion of a frequency band of a sound output by the first speaker is lower than a frequency band of a sound output by the second speaker; the first speaker includes a first diaphragm, the first diaphragm and the core housing cooperating to form a first front cavity and a first rear cavity located on two sides of the first diaphragm; the second speaker includes a second diaphragm and a speaker housing, the second diaphragm, the speaker housing, and the core housing cooperating to form a second front cavity and a second rear cavity located on two sides of the second diaphragm; the core housing is provided with a first sound outlet for conducting a sound from the first front cavity to outside of the core housing and a second sound outlet for conducting a sound from the second front cavity to the outside of the core housing; and the second speaker is further provided with a communication hole for communicating the second rear cavity with outside of the second speaker.
  2. 2 . The earphone of claim 1 , wherein when the driving circuit drives the second speaker, an operating frequency of the driving circuit includes a frequency band not higher than 200 Hz.
  3. 3 . The earphone of claim 1 , wherein the driving circuit is configured to simultaneously drive the first speaker and the second speaker through a digital-to-analog conversion circuit.
  4. 4 . The earphone of claim 1 , wherein a resonant frequency of the second speaker is not lower than 6 kHz.
  5. 5 . The earphone of claim 1 , wherein an acoustic impedance at the communication hole is in a range of 5×10 8 Pa·s/m-1.3×10 9 Pa·s/m.
  6. 6 . The earphone of claim 1 , wherein an acoustic mesh is provided at the communication hole.
  7. 7 . The earphone of claim 1 , wherein the second speaker is further provided with a second magnetic circuit system, the communication hole penetrates through the second magnetic circuit system, and an aperture of the communication hole is in a range of 0.8 mm-1.2 mm.
  8. 8 . The earphone of claim 7 , wherein in a radial direction of the second diaphragm, the communication hole is centrally provided relative to the second diaphragm.
  9. 9 . The earphone of claim 1 , wherein on a reference plane perpendicular to an axial direction of the first speaker, at least a portion of an orthogonal projection of the second speaker on the reference plane overlaps with an orthogonal projection of the first speaker on the reference plane; an axial direction of the second speaker points toward the first speaker; and the communication hole is provided facing inside of the core housing.
  10. 10 . The earphone of claim 9 , further comprising: a communication tube provided inside the core housing, wherein one end of the communication tube is in communication with the communication hole, and the other end of the communication tube is in communication with the outside of the core housing.
  11. 11 . The earphone of claim 9 , wherein the second speaker is located in the first front cavity, and the second rear cavity and the first front cavity are in communication with each other through the communication hole.
  12. 12 . The earphone of claim 1 , wherein an audio driving signal output by the driving circuit is configured to be directly input to the second speaker without undergoing frequency-dividing processing.
  13. 13 . The earphone of claim 1 , further comprising: a high-pass frequency divider disposed between the driving circuit and the second speaker and configured to perform frequency division on an audio driving signal provided by the driving circuit to the second speaker, and a frequency-dividing point of the high-pass frequency divider is set to be not lower than 6 kHz.
  14. 14 . The earphone of claim 13 , wherein the frequency-dividing point of the high-pass frequency divider is set to be not higher than 9 kHz.
  15. 15 . The earphone of claim 13 , wherein the high-pass frequency divider is a one-order frequency divider consisting of a single capacitor.
  16. 16 . The earphone of claim 13 , wherein a frequency-dividing point of the high-pass frequency divider is set such that a sound pressure level of sound output by the second speaker is attenuated by not less than 20 dB in a low-frequency band.
  17. 17 . The earphone of claim 13 , wherein a ratio of a resonant frequency of the second speaker to the frequency-dividing point is between 0.75 and 1.25.
  18. 18 . The earphone of claim 15 , wherein the frequency-dividing point of the high-pass frequency divider is between 6 kHz and 9 kHz, and the sound pressure level of the sound output by the second speaker is attenuated by not less than 30 dB in a low-frequency band.
  19. 19 . The earphone of claim 1 , further comprising: a low-pass frequency divider connected in series with the first speaker and is between the driving circuit and the first speaker, and configured to perform frequency division on an audio driving signal provided by the driving circuit to the first speaker.
  20. 20 . The earphone according to claim 19 , wherein the low-pass frequency divider is a one-order frequency divider consisting of a single inductor.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS This application is a continuation of International Patent Application No. PCT/CN2024/095600, filed on May 27, 2024, the contents of which are hereby incorporated by reference. TECHNICAL FIELD The present disclosure generally relates to the field of electronic devices, and in particular to earphones. BACKGROUND With the development of acoustic technology, earphones have been widely used in people's daily lives. An earphone may use a combination of a plurality of speakers to output a sound to provide an auditory feast for a user. During the use of the earphones, different speakers may be responsible for outputting sounds in different frequency bands. Generally, a plurality of speakers that emit sounds in different frequency bands may adopt a driving manner of single-channel electrical signal driving or multi-channel electrical signal driving. When the single-channel electrical signal driving is adopted, since the diaphragm of a speaker responsible for outputting a sound in a relatively high frequency band is usually thin, the diaphragm may experience excessive amplitude when receiving a low-frequency signal, leading to distortion that compromises sound quality and user experience. SUMMARY Embodiments of the present disclosure provide an earphone. The earphone may include: a core housing; a first speaker; a second speaker; and a driving circuit. The core housing accommodates the first speaker and the second speaker. The driving circuit is configured to drive the first speaker and the second speaker. At least a portion of a frequency band of a sound output by the first speaker is lower than a frequency band of a sound output by the second speaker. The first speaker includes a first diaphragm. The first diaphragm and the core housing cooperate to form a first front cavity and a first rear cavity located on two sides of the first diaphragm. The second speaker includes a second diaphragm and a speaker housing. The second diaphragm, the speaker housing, and the core housing cooperate to form a second front cavity and a second rear cavity located on two sides of the second diaphragm. The core housing is provided with a first sound outlet for conducting a sound from the first front cavity to outside of the core housing, and a second sound outlet for conducting a sound from the second front cavity to the outside of the core housing. The second speaker is further provided with a communication hole for communicating the second rear cavity with outside of the second speaker. In some embodiments, when the driving circuit drives the second speaker, an operating frequency of the driving circuit includes a frequency band not higher than 200 Hz. In some embodiments, the driving circuit is configured to simultaneously drive the first speaker and the second speaker through a digital-to-analog conversion circuit. In some embodiments, a resonant frequency of the second speaker is not lower than 6 kHz. In some embodiments, an acoustic impedance at the communication hole is in a range of 5×108 Pa·s/m-1.3×109 Pa·s/m, and/or an acoustic mesh is provided at the communication hole. In some embodiments, the second speaker is further provided with a second magnetic circuit system, the communication hole penetrates through the second magnetic circuit system, and an aperture of the communication hole is in a range of 0.8 mm-1.2 mm. In some embodiments, in a radial direction of the second diaphragm, the communication hole is centrally provided relative to the second diaphragm. In some embodiments, on a reference plane perpendicular to an axial direction of the first speaker, at least a portion of an orthogonal projection of the second speaker on the reference plane overlaps with an orthogonal projection of the first speaker on the reference plane; an axial direction of the second speaker points toward the first speaker; and the communication hole is provided facing inside of the core housing. In some embodiments, the earphone further includes a communication tube provided inside the core housing. One end of the communication tube is in communication with the communication hole, and the other end of the communication tube is in communication with the outside of the core housing. In some embodiments, the second speaker is located in the first front cavity, and the second rear cavity and the first front cavity are in communication with each other through the communication hole. In some embodiments, an audio driving signal output by the driving circuit is configured to be directly input to the second speaker without undergoing frequency-dividing processing. BRIEF DESCRIPTION OF THE DRAWINGS To more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present disclosure. For those of ordinary skil