Patent ID: 8646570

Claim:
A diaphragm of an electric sound converter, comprising: a diaphragm film having a center dome, a reinforcing film made of a same material as that of the diaphragm film and having a same shape as that of the center dome, and a hot-melt adhesive having same nature as that of the diaphragm film and interposed between the diaphragm film and the reinforcing film to fix the diaphragm film and the reinforcing film, wherein the reinforcing film includes a concave surface side where the adhesive is applied having a groove formed in a polygonal reticulate pattern, and a convex surface side, at an opposite side of the concave surfaces side, having a convex rib corresponding to the groove, and the groove is filled with the adhesive and cured so that the adhesive interposed between the diaphragm film and the reinforcing film in the convex rib has a thickness greater than other portions.