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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view showing a conventional
drone cone for a speaker, and FIGS. 2a and 2b are a cross-sectional view and a front view
showing an embodiment of a drone cone for a speaker of the present invention. 11 ······
Diaphragm, 12 ································· Rings. Fig. 1-85-actual opening 49-85 135 (2) Fig. 2 (a) (b) 1%-
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a loudspeaker
drone cone that effectively radiates bass by passive operation. The conventional drone cone for a
speaker had a structure with a magnetic circuit removed from the speaker as shown in FIG. In
this case, a part of the edge 2 is pressed by the pressing plate 6 and a key 5 is attached at the
center of the cone 4 in a frame 1 in which a cone 4tx supported by the edge 2 and the damper 3
is disposed. . However, since the speaker drone cone has a large stiffness of the damper 3 as
described above, it is difficult to reduce the number to 1 to the resonance layer, and in some
cases a metal ring is added or the resonance frequency is lowered as force. In this case, age 2
may cause age-related deterioration or the like. And there was a sharp increase in efficiency.
Thus, the conventional drone cone for a speaker is complicated in structure and expensive, and
there is a problem in tuning. The present invention has been made in view of the above points,
and it is simple in structure, can easily obtain a low resonance frequency, and can reduce the loss
of efficiency by reducing the stagnation of the diaphragm due to the aged deterioration. The
purpose is to support corn. An embodiment of the present invention will be described in detail
with reference to FIG. S2 (a) and (b) below. A flexible, flexible edge 912 is provided, and is
sandwiched between the rings 13.14 on the chest portion lJ2 of the diaphragm 11. According to
such a structure, since the damper is splinted, it becomes an extremely high compliance vibrating
thread, and the peristaltic force IJ can provide a sufficiently low resonant frequency. In addition,
* 1 is light on 11 because it is light, so it is less likely to get stagnant due to aging, and there is
also little loss of efficiency. And it is extremely cheap. As a specific example, a speaker of
frequency fQ = 80 Hs (1 ') m diameter 16 cut is accommodated in a box of internal volumetric
BDt, and a conventional drone cone as shown in FIG. 1 is added with a weight of 1Of If you do
not get good characteristics, you will get the optimum characteristics that require dust, especially
when you put on a real drone cone as shown in 21st RI <&) (b). As described above, according to
the present invention, it is possible to provide a speaker drone cone having a simple structure,
easily obtaining a low resonance frequency, and reducing the stagnation of the diaphragm due to
aging and reducing the loss of efficiency. it can.