Patent ID: 8682021

Claim:
A speaker unit comprising: a coil; a diaphragm including a trunk portion to which a coil is attached, and an edge portion surrounding an outer circumference of said trunk portion in plan view; and a reinforcement sheet attached to said trunk portion, wherein an outer circumference of said edge portion includes first and second edge straight sections extending linearly in a major axis direction and a minor axis direction of said edge portion, respectively, and an edge curve section joining said first and second edge straight sections together, wherein said diaphragm includes a plurality of crimps in a region of said edge portion located between phantom straight lines extending from the center of said trunk portion to either end of said edge curve section, wherein all of said plurality of crimps extend radially about said center of said trunk portion, and wherein each of said trunk portion of said diaphragm and said reinforcement sheet is transparent relative to light having a wavelength in a visible light region.