Acoustic device and electronic apparatus

An acoustic device, comprising a sound generating unit, the sound generating unit comprises a vibrating diaphragm, the acoustic device is provided with a sound outlet, and a sound wave at a front side of the vibrating diaphragm radiates to outside through the sound outlet,

• wherein a first sealed cavity is formed at a rear side of the vibrating diaphragm, a cavity wall of the first sealed cavity is provided with a mounting hole, a flexible deformation part is provided at the mounting hole, a second sealed cavity is provided at outside of the first sealed cavity, the flexible deformation part is located between the first sealed cavity and the second sealed cavity, and the second sealed cavity seals a sound wave, which is generated by the flexible deformation part during deformation, in the second sealed cavity,
• wherein a protective cover plate located at outside of the flexible deformation part is further provided on the mounting hole, and an escape space used for avoiding vibration of the flexible deformation part is formed between the protective cover plate and the flexible deformation part;
• and
• wherein a plurality of air permeable micropores are provided on the protective cover plate, and each of the air permeable micropores has an area less than or equal to 0.2 mm2.