Patent ID: 8131001

Claim:
A loudspeaker diaphragm, comprising a diaphragm body of an elongated shape defining a major-axis direction and a minor-axis direction, and an edge for supporting an outer periphery of the diaphragm body, wherein: the diaphragm body includes a first diaphragm portion in a central portion of a rear surface thereof, the first diaphragm portion including a junction to a voice coil bobbin, a second diaphragm portion extending on each side of the first diaphragm portion in the major-axis direction and is void of a junction to the voice coil bobbin, and a reinforcement rib extending continuously through the first diaphragm portion and the second diaphragm portions; and the edge includes a free edge portion for freely supporting opposite ends in the minor-axis direction of the first diaphragm portion and the second diaphragm portion, and a fixed edge portion being thicker than the free edge portion for fixedly supporting a distal end of each second diaphragm portion in the major-axis direction.