Title:
LOUDSPEAKER BOX
Document Type and Number:
WIPO Patent Application WO/2024/036692
Kind Code:
A1
Abstract:
Provided in the present invention is a loudspeaker box, comprising a shell, a sound production unit and a magnetic-circuit coupling valve. The sound production unit comprises a basket, a vibration system and a magnetic circuit system, wherein the magnetic circuit system comprises secondary magnetic steel. The shell comprises a lower cover, wherein the lower cover, the basket and the magnetic circuit system jointly enclose a rear cavity, and the lower cover comprises a plurality of leakage holes; and the magnetic-circuit coupling valve is accommodated in the rear cavity. The magnetic-circuit coupling valve comprises: a support, which is fixed to the basket or a magnetic yoke; a negative-stiffness vibrating diaphragm, which is fixed to the support; and a coil, which is fixed to the side of the negative-stiffness vibrating diaphragm close to the secondary magnetic steel and is spaced apart from the secondary magnetic steel, wherein the negative-stiffness vibrating diaphragm directly faces the leakage holes and are spaced apart from same; and the coil receives an external control signal and generates an electromagnetic field together with the secondary magnetic steel, so as to drive the negative-stiffness vibrating diaphragm to abut against the leakage holes so that the leakage holes are sealed and in a closed state, or drive same to move away from the leakage holes so that the leakage holes are in an open state, or drive same to partially abut against the leakage holes so that the leakage holes are in a partially open and closed state. Compared with the prior art, the loudspeaker box of the present invention can accurately control a communication state between the rear cavity and outside air, and has a good acoustic performance.
Inventors:
HUI YAO (CN)
CHU YUFEN (CN)
LIU JIUJIAN (CN)
CHEN WEIMIN (CN)
CHU YUFEN (CN)
LIU JIUJIAN (CN)
CHEN WEIMIN (CN)
Application Number:
PCT/CN2022/120175
Publication Date:
February 22, 2024
Filing Date:
September 21, 2022
Export Citation:
Assignee:
AAC TECHNOLOGIES PTE LTD (CN)
International Classes:
H04R9/06; H04R9/02
Domestic Patent References:
| WO2021174570A1 | 2021-09-10 | |||
| WO2021174572A1 | 2021-09-10 |
Foreign References:
| CN204559875U | 2015-08-12 | |||
| CN109309887A | 2019-02-05 | |||
| JP2009188703A | 2009-08-20 |
Attorney, Agent or Firm:
SHENZHEN JUNXINCHENG INTELLECTUAL PROPERTY FIRM (GENERAL PARTNERSHIP) (CN)
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