Patent ID: 8265332

Claim:
A speaker diaphragm having a circular opening in a center zone thereof comprising: a concave and convex pattern of a plurality of concave sections and convex sections formed on a front surface or a rear surface of the diaphragm; wherein the concave and convex pattern is formed in a manner that; a plurality of concave sections and convex sections are formed in each of a plurality of regions provided at a regular interval with a specific angle in a circumferential direction of the diaphragm, the concave and convex sections formed in each region have different sizes in a radial direction of the diaphragm, a plurality of concave and convex sections formed in adjacent regions are displaced from each other in the radial direction, and the concave sections and the convex sections formed on the diaphragm are aligned on at least a first imaginary curved line and at least a second imaginary curved line, respectively, each imaginary curved line passing a plurality of regions and approaching an inner periphery of the circular opening from an outer periphery of the diaphragm.