▎ 摘　　要

NOVELTY - Ball top (100) comprises a core layer (110) and two surface layers (120). The surface layers are respectively located on both sides of the core layer. The core layer is made of organic gas gel. The inner portion of core layer has a porous structure. The porous structure has a bubble hole. The hole wall thickness of the bubble hole is 1 nm-1 m. The compression strength of the ball top along the thickness direction is more than 10 MPa. USE - Ball top used for sounding device (claimed). ADVANTAGE - The surface layer in the ball top is directly bonded and fixed by the organic gas gel layer, the density of the organic gas gel layer is small, so as to reduce the weight of the ball top and improve the intermediate frequency sensitivity. The organic gas gel layer has good temperature resistance, so as to ensure the vibration consistency of the ball top at high temperature environment, and avoids occurrence of separation vibration. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for: A diaphragm assembly used in sounding device, which comprises a diaphragm and the ball top. The ball top is connected with the diaphragm bonding or integrally injection molding. A sounding device, which comprises diaphragm assembly; An electronic device, which comprises the sounding device. DESCRIPTION OF DRAWING(S) - The drawing shows a structure diagram of the ball top of sounding device. 100Ball top 110Core layer 120Surface layer