Sound-generating device, acoustic module and electronic equipment installed with the sound-generating device

Abstract

The invention provides a sounding device, which includes a vibrating assembly and a magnetic circuit assembly, the vibrating assembly includes a diaphragm, wherein the middle area of ​​the magnetic circuit assembly is hollowed out to form an expansion cavity that runs through the magnetic circuit assembly, and the magnetic circuit A flexible deformation part is provided on the component located in the expansion cavity; the flexible deformation part covers the port of the expansion cavity or the flexible deformation part separates the expansion cavity into two isolated areas; The flexible deformation part is arranged facing the diaphragm; the diaphragm includes a diaphragm body and a composite layer, the composite layer is combined with the middle position of the diaphragm body, and the composite layer is provided with a direction to A connecting part extending from one side of the flexible deformation part and connected with the flexible deformation part; the flexible deformation part vibrates synchronously with the diaphragm. The sound generating device increases the equivalent volume of the sound cavity behind the sound generating device, improves the low-frequency sensitivity of the sound generating device, and can suppress the polarization of the diaphragm.

Description

technical field [0001] The present invention relates to the technical field of acoustics, and more specifically, to a sound generating device, an acoustic module and electronic equipment equipped with the sound generating device. Background technique [0002] Generally speaking, the acoustic system of the traditional structure includes a closed box and a sounding unit arranged on the closed box. A cavity is formed between the closed box and the sounding unit. Due to the volume limitation of the cavity in the acoustic system, the acoustic system Especially with small acoustic systems it is difficult to achieve satisfactory bass reproduction. Conventionally, in order to achieve satisfactory bass reproduction in an acoustic system, two methods are usually used. One is to place sound-absorbing materials in the box of the acoustic system to absorb or desorb the gas in the box and play a role in volume. The effect of increasing and then reducing the low-frequency resonance freque...

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Problems solved by technology

[0003] However, there are problems in the above two methods. The first method of adding sound-absorbing materials to the cabinet needs to achieve good sealing and packaging of the sound-absorbing materials. Otherwise, if the sound-absorbing materials enter the sound-generating unit, it will damage the acoustic performance of the sound-generating unit and affect the sound-generating unit. service life; the second scheme using a passive radiator can only improve the sensitivity of the frequency band near the resonance point, but cannot improve the sensitivity of all low frequency bands

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