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JPS57122991

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DESCRIPTION JPS57122991
BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1a and 1b are plan and sectional views
respectively for explaining the process of making an edge portion of a conventional drone cone,
and FIGS. 3 is a cross sectional view showing an embodiment of the present invention.
Explanation of symbols, 11 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · diaphragm.
DETAILED DESCRIPTION OF THE INVENTION This invention relates to drone cones, and more
particularly :) □, □, 5 °. −オう。 As well known, as the speaker system, the closed box type
and the bass reflex type are often used for the closure, and among them, the one using the drone
cone for the bass reflex type is being won 0 As a conventional method for producing a drone
cone of this type, for example, as shown in FIGS. 1 (a) and 1 (b), the central hatched portion 2 is
punched out leaving the ring-shaped edge portion 1 curved at the top After the normal edge
structure 3 is produced as shown in FIG. 2 (a) K except for the hatched portion 2, FIG. N->); i '/ 0
dll 2 FIG. (B) K as an edge structure The inner edge 3AK diaphragm 4 of 3 is adhered, and the
lower surface (or upper surface) K of the diaphragm 4 is reinforced and the reinforcing member
5 for preventing the resonance of the diaphragm 4 is adhered by adhesion etc. I was getting
Therefore, in such a conventional example, when forming the edge structure 3, since the hatched
portion 2 which occupies most of the material E is discarded, much waste is generated in the
material and the resource busy is also large loss. The removal and removal process is also
required, and wasteful operations are required, resulting in an increase in manufacturing cost.
Therefore, in this invention, these problems are kept busy to eliminate these defects, and the
feature is that the edge portion and the reinforcing material portion of the diaphragm are
integrally formed, and the diaphragm is attached to the reinforcing material portion. It is K to
provide a drone cone characterized by wearing and fixing. That is, as shown in FIG. 3, this
invention is formed by integrally molding the edge portion 11 and the reinforcing portion 12 in
the casting of polyurethane or synthetic paper pulp liquid, etc. The lower surface (or upper
surface) #C diaphragm 13 is adhered. Therefore, according to this invention, it is possible to
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eliminate the large waste of the material in the conventional example at one step, and wasteful
processes such as punching are not necessary, so the manufacturing cost can be greatly reduced
and resources can be saved. It is a useful device in line.
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