Acoustic device and electronic apparatus

Abstract

The invention discloses an acoustic device, which comprises a sound production unit, the sound production unit comprises a vibrating diaphragm, the acoustic device is provided with a sound outlet, andsound waves at the front side of the vibrating diaphragm are radiated to the outside through the sound outlet; wherein a closed cavity is formed in the rear side of the vibrating diaphragm, the closed cavity is divided into a first closed cavity and a second closed cavity by a spacing part, the spacing part can be at least partially and flexibly deformed, the first closed cavity is adjacent to the vibrating diaphragm, the second closed cavity is far away from the vibrating diaphragm, and the volume of the second closed cavity is greater than that of the first closed cavity; the second closedcavity is used for closing sound waves generated by the flexible deformation part during deformation in the second closed cavity; at least one part of the shell of the electronic equipment used for installing the acoustic device is used for forming the first closed cavity and / or the second closed cavity. According to the acoustic device, the resonant frequency can be effectively reduced, and the low-frequency-band sensitivity of the product is greatly improved on the whole.

Description

technical field [0001] The present invention relates to the technical field of acoustics, and more specifically, to an acoustic device and electronic equipment installed with the acoustic device. Background technique [0002] Generally speaking, the acoustic system of the traditional structure (prior art 1) includes a closed box and a sounding unit arranged on the closed box, and a cavity is formed between the closed box and the sounding unit, because the cavity in the acoustic system Due to volume limitations, it is difficult for an acoustic system, especially a small acoustic system, to achieve a satisfactory reproduction of bass. Conventionally, in order to achieve satisfactory bass reproduction in an acoustic system, two methods are usually used. One is to place sound-absorbing materials (such as activated carbon, zeolite, etc.) in the box of the acoustic system for adsorption or desorption. The gas in the body has the effect of increasing the volume and reducing the lo...

AI Technical Summary

Problems solved by technology

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 speaker unit, it will damage the acoustic performance of the speaker unit and affect the speaker unit. The service life of the second type of passive radiator is adopted. Near the resonant frequency point fp, the passive radiator radiates strongly, and the sound unit almost stops. Therefore, the high-sensitivity design of the passive radiator can be used to realize the acoustic system in the frequency band near fp The local sensitivity is enhanced; but in the frequency band below fp, the phase of the passive radiator and the sound wave of the sounding unit are opposite, the sound waves cancel each other out, and the passive radiator has a negative effect on the sensitivity of the acoustic system

All in all, the 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.

Images