▎ 摘　　要

NOVELTY - A composite material of cylindrical shape graphene structure and a conductive polymer, are molded to form the sheet shaped diaphragm (11). The cylindrical shape graphene structure includes a carbon nanotube or a carbon nano fiber. USE - For speaker (claimed) used in audio equipment. ADVANTAGE - Highly rigid and light weight diaphragm having excellent physical characteristics is obtained, by molding composite material with conductive polymer, thus high quality tone is output from the speaker. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for the following: (1) diaphragm manufacturing method; and (2) speaker. DESCRIPTION OF DRAWING(S) - The figure shows a sectional view of the speaker. Diaphragm (11) Vibration excitation apparatus (12) Speaker (13)