▎ 摘　　要

NOVELTY - The diaphragm (1) has composite material of cylindrical shape graphene structure such as carbon nano tube or carbon nano fiber molded with a resin such as thermosetting resin and ferroelectric polymer in the form of sheet. USE - Used for speaker (claimed) e.g. electrodynamic type speaker, piezoelectric type speaker, capacitor type speaker, magnetic type speaker, flat surface type speaker and cone type speaker for audio equipment and video/audio equipment. ADVANTAGE - Improves the tone quality and rigidity of the diaphragm and reduces the weight by molding composite material of cylindrical shape graphene structure. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for the following: (1) diaphragm manufacturing method; and (2) speaker. DESCRIPTION OF DRAWING(S) - The figure shows the top view of the cylindrical shape graphene structure of the diaphragm. diaphragm (1) vibration excitation apparatus (2)