DIAPHRAGM AND SPEAKER INCLUDING SAME

摘要

[PROBLEMS] To provide a diaphragm enabling prevention of an unnecessary depression at the end of a diaphragm piece in a major-axis direction and reduction of the distortion of the sound produced by a speaker and a speaker including the same. [MEANS FOR SOLVING PROBLEMS] A diaphragm (4) has a noncircular shape with a major axis a and a minor axis ß different from each other and includes a diaphragm piece (4a). When the length ? of the diaphragm piece (4a) in a major-axis direction (X) is denoted by 2a, the length d of the diaphragm piece (4a) in a minor-axis direction Y is denoted by 2b, the length s from the center O of the diaphragm (4) in the major-axis direction X to the periphery (42a) of the diaphragm piece (4a) is denoted by x, and the length t from the center O of the diaphragm (4) in the minor-direction Y to the periphery (42a) of the diaphragm piece (4a) is denoted by y, the shape of the periphery (42a) of the diaphragm piece (4a) satisfies the following formula 1.