Sound-producing apparatus, acoustic module provided with sound-producing apparatus, and electronic device

A sound-producing apparatus, comprising a vibration assembly and a magnetic circuit assembly, the vibration assembly comprises a diaphragm which vibrates to generate sound waves, wherein,

• a middle region of the magnetic circuit assembly is hollowed out to form a volume expansion cavity penetrating through the magnetic circuit assembly, with a flexible deformation portion being provided in the middle region of the magnetic circuit assembly located in the volume expansion cavity;
• and the flexible deformation portion is selected from the group consisting of the flexible deformation portion that covers a port of the volume expansion cavity and the flexible deformation portion that separates the volume expansion cavity into two regions that are isolated from each other;
• wherein the flexible deformation portion is disposed facing the diaphragm, and is adapted to vibrate as a function of air pressure;
• and
• wherein at least a partial area of the flexible deformation portion is selected from the group consisting of Thermoplastic Polyurethanes (TPU), Thermoplastic Polyester Elastomer (TPEE), Liquid Crystal Polyester (LCP), Polyarylate (PAR), Polycarbonate (PC), Polvamide (PA), Polyphthalamide (PPA), Polyetheretherketone (PEEK), Polyetherimide (PEI), poly(ethylene naphthalate) (PEN), Poly(ether sulfones) (PES), Polyethylene terephthalate (PET), Polyimide (PI), PolyPhenyleneSulfide (PPS), Polyphenylene sulfone resins (PPSU), Polysulfone (PSU), rubber and silicone rubber.