▎ 摘　　要

NOVELTY - The diaphragm (10) has a substrate layer (101) that is made of graphene or multilayer graphene. A metal plating layer (102) is compounded on the substrate layer. The material of the metal plating layer includes two metals. The material of the metal plating layer is a metal. The material of the metal coating includes two metals, magnesium and lithium. The material of the metal coating is any one of beryllium, titanium, aluminum, copper, silver, gold, magnesium, and lithium. USE - Diaphragm used in sound-producing device and microphone (all claimed). ADVANTAGE - The diaphragm provides a vibrating membrane with high rigidity, low density, good heat dissipation performance, low Poisson's ratio, good internal sound speed, simple production, and low price with excellent high-frequency, intermediate-frequency and low-frequency sound quality. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a manufacturing method of diaphragm. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of a diaphragm. Diaphragm (10) Coil (30) Substrate layer (101) Metal plating layer (102)