DIAPHRAGM FOR SPEAKER INTEGRALLY FORMED WITH DIFFERENT DEGREES OF RIGIDITY IN ONE POLYMERIC FILM

摘要

PROBLEM TO BE SOLVED: To provide a diaphragm for a broadband speaker by utilizing a polymeric film that may have both crystalline and amorphous structures.SOLUTION: A diaphragm includes a polymeric film 20 prepared by integrally forming a central part and an edge part. An area (first film area 21) of the polymeric film corresponding to the central part is formed with a crystalline structure, and an area (second film area 22) of the polymeric film corresponding to the edge part is formed with an amorphous structure. The second film area 22 is formed with heat in a first temperature range, and the first film area 21 is formed with heat in a second temperature range higher than the first temperature range.