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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a cone speaker showing
one embodiment of the present invention, FIG. 2 is an exploded perspective view of the cone
speaker, FIG. 3 is a central longitudinal sectional view of FIG. 4 is a cross-sectional view of the
main part of the transfer molding die showing the integral molding process of this invention, FIG.
5 is an enlarged view of part A thereof, FIG. 5a is before clamping and FIG. FIG. 10 ...... cone
speaker, 11 ...... corn, 15a ...... mounting flange portion, 15b ...... attaching reinforcing frame, 20
...... edge .
1. Field of the Invention The present invention relates to a cone speaker, and more particularly to
a structure of a cone-to-edge junction of a cone speaker having a rubber edge formed on its
periphery. At the outer peripheral edge of the cone speaker, a jH1 bendable edge portion such as
rubber is usually provided as a connection portion between the attachment portion and the cone
portion. This edge portion is conventionally formed of a comb-shaped product or a pressed sheet
of a Boliureta / sheet, which is joined to the peripheral edge portion of the cone by a bonding
agent (1) / 7 [theta] 7 [theta]. However, it is not only inefficient to take such multiple steps, but
when bonding the edge to the cone, it must be attached to the mold one by one and proceed with
the bonding operation, and further rubber molded articles In the case of obtaining a sinter,
complicated finishing work such as removal of paris or work efficiency such as disposal of the
surplus portion at the time of punching of a sheet, or economic inconvenience has occurred. In
this invention, the edge is integrally formed in order to solve such a defect at once-tm is
proposed, but in the case of the edge, the edge of the cone and the edge should be joined
effectively and centrally. Is a book that proposes a structure that can FIG. 1 is a perspective view
of a cone speaker 10 according to an embodiment of the present invention, and FIG. 2 is an
exploded perspective view of the cone speaker according to an embodiment of the present
invention. A central longitudinal sectional view, FIG. 4 is a sectional view of an essential part at
the time of molding, and FIGS. 5a and 5b show enlarged views of a portion A in FIG. (2) As shown
in the drawing, the cone speaker 10 is formed by integrally forming an edge 20 made of rubber
on & of an outer circle of a bowl-shaped cone 11. It is usual that an attachment S portion 158
which is an attachment portion to the slider box or a reinforcing rod 151 for attachment is
further formed on the outer periphery of the edge 20. The cone 11 and the mounting S portion
15aX are generally made of paper. FIG. 3 is a central longitudinal sectional view of a cone
speaker according to the present invention, and different embodiments are shown on the left and
right of the figure. First, the left side of the figure is an example in which only the edge 20 is
integrally joined to the peripheral edge of the cone 11, and the right side of the figure further
integrates the mounting flange portion 15a or the mounting reinforcing frame] 5-o on the outer
periphery of the edge 20. It is an example joined to As shown in FIG. 1 and FIG. 4 which will be
described later, or A5 weight% 1 of the weight of this invention, the edge 20 made of rubber is
integrally formed on the periphery of the cone 11 as follows. Lower mold clamping pressure
applied to the circumference of the low 7 l 10 part lower than other parts to press fit and mold
the unvulcanized rubber (3) and form a thin film of rubber on the peripheral part of the cone 11
to integrate the edge 20 It was in the
More specifically, FIG. 4 and the following are related to the cross-sectional view of the integral
molding transfer molding die, and as shown in FIG. 5a, the upper die 9 in the mounting portion
of the cone 11 has its cone circumferential @ contact portion 9a. Is configured to be slightly
concave than the other cone contact portion 9b via the sunk portion 9C. When the cone 11 is
mounted between the dove-tail 8 and the upper mold 9 and the unvulcanized rubber R is pressfitted by this VC configuration, the cone circumference → portion contact portion 9a of the
upper mold 9 Since the mold clamping pressure is lower than that of the cone contact portion
9b, the edge (the non-U [] -vulcanized rubber R constituting +7 wraps around the gap of the core
contact s9a and adheres integrally to the rim of the edge as the coated rubber 21. And if it is
fully vulcanized and molded, the edge integrally joined to the peripheral edge of the cone is
gathered and gly eta) completely. That is, this invention utilizes a flow 1 'r of unadded individual
rubber by a clamping pressure to form a very young joint. Unlike the conventional speakers as
described above, the cone-shoe force obtained by the above-described method greatly eliminates
the need for an adhesive and a bonding step, which is large in terms of economy and production
efficiency. Bring benefits. Furthermore, since the joint in this invention forms ta rubber m by the
difference in clamping pressure as described above, the joint can be made thinner, and the joint
is also much stronger than that performed by the adhesive, and Being complete, it also improves
the durability without reducing any acoustical effects of the cone. Furthermore, for the same
reason, there is an extremely large practical effect of this invention, such as the attachment
flange portion or the integral formation of the attachment reinforcement frame can be extremely
easily and easily formed on the outer periphery of the edge. .