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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal sectional front view of a
conventional speaker diaphragm, FIG. 2 is a partially enlarged view of the same, and FIG. 3 is a
longitudinal sectional front view of a loudspeaker diaphragm according to the present invention,
The fourth fungus is also an enlarged view of part. Description of symbols, 4
··············································································· Fig. 1 Fig. 2 Fig. 2 Fig. 2 Fig. 2-93- ) Figure 3 Figure 4 1
94 1
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electrodynamic
loudspeaker diaphragm VC. In the 10 o electrodynamic speaker, an air gap is formed in a
magnetic circuit composed of a magnet and a magnetic material, a cone drive coil is snowed in
this air gap, and a direct current magnetic field and vibration N drive formed by the magnetic
circuit It is converted into an electric signal tube sound 15 by the change of the alternating
magnetic field flowing in the coil. In general, the drive coil is wound on a bobbin made of paper
or a polymer material or the like, and this bobbin is attached to a cone with ## adhesive. In FIGS.
1 and 2, a cone 2 is a bobbin 1 and is fixed to a bobbin 2t cone lVc using an adhesive 3t9. 2-P. 1
In the electrodynamic speaker, the cause of the occurrence of distortion can be considered
variously-among them, due to the positional relationship of the drive coil in the magnetic circuit.
There is driving distortion. As a countermeasure for this, generally, generation of distortion is
suppressed as much as possible by a method such as using 5 turns of drive coil double wound
and using a pole face facing the coil more than the effective coil width. The above method is
effective when the positional relationship of the bobbins mounted in the magnetic circuit is
always parallel and mass balance with the diaphragm (corn) 10K is maintained, but as described
above, the bobbin and the cone are bonded Because they are fixed by the agent, they are not
necessarily parallel to the magnetic pole, and are unbalanced in mass from the adhesive
application amount W. The present invention is a book designed for the purpose of reducing
distortion of a speaker drive system except for the above two drawbacks. FIG. 3 shows an
embodiment of a speaker diaphragm according to the present invention. In the figure, 4 indicates
a cone formed by drawing a nonmagnetic metal plate, and this cone 4 is formed integrally with a
coil 6t-bobbin 5't-3---page 1 to be wound. . Since the present invention is formed integrally with
the bobbin portion and the cone as described above, there is no joint at all like the conventional
diaphragm shown in FIG. Therefore, the electric signal in the magnetic circuit 5 radiates the
driving force circumferentially around the coil bobbin without waste, and the driving distortion is
reduced. In addition, when the cone and the bobbin part are integrally formed of a metal material
as in the present invention, it is conceivable that breakage or wrinkles may occur, but this can be
solved by performing appropriate material annealing during the drawing process. .