Sound production device, acoustic module provided with sound production device and electronic equipment

Abstract

The invention provides a sound production device which comprises a vibration assembly and a magnetic circuit assembly, the vibration assembly comprises a diaphragm, the middle area of the magnetic circuit assembly is hollowed out to form an expansion cavity penetrating through the magnetic circuit assembly, and the area, located in the expansion cavity, of the magnetic circuit assembly is providedwith a flexible deformation part; the flexible deformation part covers the port of the capacity expansion cavity or divides the capacity expansion cavity into two mutually isolated partial areas; theflexible deformation part is arranged opposite to the vibrating diaphragm; the vibrating diaphragm comprises a vibrating diaphragm body part and a composite layer, the composite layer is combined inthe middle of the vibrating diaphragm body part, and the composite layer is provided with a connecting part which extends towards one side of the flexible deformation part and is connected with the flexible deformation part. And the flexible deformation part and the vibrating diaphragm vibrate synchronously. According to the sounding device, the equivalent volume of the rear vocal cavity of the sounding device is increased, and the low-frequency sensitivity of the sounding device is improved; and the polarization of the diaphragm can be suppressed.

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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