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Brief description of the drawings
1 is a side sectional view of a conventional speaker, FIG. 2 is a side sectional view of a speaker of
the present invention, and FIG. 3 is a rear view of a flat diaphragm used in the speaker of FIG.
FIG. 6 is a perspective view of another embodiment of the flat diaphragm according to the
present invention. DESCRIPTION OF SYMBOLS 1 ... Magnetic circuit, 2 ... Frame, 3.30 ... Flat plate,
diaphragm, 4 ... Edge, 31 ... Protrusion piece, 32 ... Cylindrical part. −