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JPH02239799

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DESCRIPTION JPH02239799
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
molding apparatus for a loudspeaker diaphragm, and more particularly to a molding apparatus
suitable for insert molding of a cone diaphragm and an edge. [Prior Art] It is known to insert a
diaphragm used for a speaker, in particular a cone-shaped diaphragm with an edge which is a
suspension, as shown in FIG. Is shown. That is, a cavity l ^ corresponding to a cone-shaped
diaphragm is formed in the fixed type L, and an insert cavity 1B for inserting an edge is
continuously formed in the cavity IA. The movable mold 2 is met, the edge 3 is inserted, and
resin is injected into the cavity IA in which the inner peripheral edge 3A is located, and the
diaphragm 4 and the edge 3 are integrally formed. [Problems to be Solved by the Invention] In
the insert mold apparatus as described above, when the inner peripheral edge 3A of the edge 3
exists on the front side of the diaphragm 4 depending on the injection condition, FIG. 4 (A)) and
There is a case (FIG. 4 (B)). In other words, even when the case 1 is made to place the edge 3 on
the front side of the diaphragm 4, a woven fabric of cotton, silk or the like or a woven fabric of
heat resistant chemical fiber is used as the edge. Since a composite material in which a filler such
as carbon fiber and mica is mixed with bollyblopyrene is used as the diaphragm, the rigidity of
the edge 3 is small, and it is broken in the cavity IA and is injection molded as it is, and vibration
is generated. The plate and the edge will be integrated. Moreover, when it is sad, the edge may be
located on the front side of the diaphragm while the same diaphragm is in part, and the edge
may be on the back side of the diaphragm in other parts, and the quality of the diaphragm is not
constant. There was a problem. Therefore, the present invention is intended to provide a molding
die apparatus for a speaker diaphragm in which the relationship between the edge and the
diaphragm is surely set in a predetermined state when the diaphragm is insert-molded. . [Means
for Solving the Problems] In order to achieve the above object, the present invention relates to a
cavity for injection-molding a diaphragm in a molding die apparatus for molding a cone-shaped
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1
diaphragm by inserting an edge. And a correction cavity in which the inner peripheral edge of
the edge is accommodated between the insert cavity and the edge, the correction cavity being
structured such that the inner peripheral edge of the edge can be pressed against the upper
surface or the outer surface by injection pressure It is characterized by being.
[Operation] Since there is a deformation space at the periphery of the cavity for deforming the
inserted inner edge of the edge toward the upper or outer edge in the cavity for the diaphragm,
the resin of the diaphragm is injected. The inner peripheral edge of the edge is surely in place.
Embodiments of the present invention will now be described with reference to FIGS. 1 and 2 of
the accompanying drawings. First, in these figures, the reference numeral U is a fixed type, has a
cavity 12 corresponding to a cone-shaped diaphragm, and inserts an edge 22 at the periphery of
the cavity 12 corresponding to the periphery of the diaphragm. An insert cavity 3 is formed, and
a correction cavity 12X is formed in the continuous portion of the cavity 12 and the insert cavity
18 so that the inner peripheral edge 22 ^ of the edge 22 is corrected by the pressure of the
injection resin. The upper surface 12m + of the cavity 12X is a burning line of the movable die
15 which is the upper die. Further, the inner peripheral side of the correction cavity 12X is an
inner side 12n which stands up from the cavity 12, and the end face of the inner peripheral edge
22A of the edge 22 abuts. In the molding die apparatus as described above, when the edge 22 is
inserted into the insert cavity 12X, the inner peripheral edge 22A of the edge 22 hangs down in
the correction cavity 12X by its own weight as shown by the phantom line in FIG. Even when the
space is formed above and below 22A, the inner peripheral edge 22A of the edge 22 is integrated
with the diaphragm in a state of being pressed against the upper surface l2- of the correction
cavity l'2X by the injection pressure of the diaphragm. . [Other Embodiments] In the above
embodiments, a mold apparatus suitable for molding a device in which the inner peripheral edge
22 ^ of the edge is located on the front side of the diaphragm has been described. In order to
form the diaphragm on which the peripheral edge 22A is located, as shown in FIG. 2, the wall of
the outer side 12P of the correction cavity 12X is made vertical, and the inner peripheral edge
22A of the edge 22 is as shown in FIG. A mold is used which can be pressed against the outer
side 12P by injection pressure even in a floating state due to some elasticity. Thus, it is possible
to obtain a diaphragm in which the inner peripheral edge 22A of the edge 22 is located on the
back side of the diaphragm. In this embodiment, the outer side 12P is shown to be vertical.
However, the outer side 12P may not necessarily be vertical, and may be an inclined surface.
[Effects of the Invention] As is apparent from the above description, in the molding apparatus for
a loudspeaker diaphragm according to the present invention, the inner peripheral edge of the
edge is between the cavity for molding the diaphragm and the insert cavity for inserting the
edge. A correction cavity to be accommodated is provided, and the injection pressure in injection
molding of the diaphragm ensures that the inner edge of the edge is the front side of the
diaphragm.
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Alternatively, since it is configured to be able to be positioned on the back side (including the
circumferential side), control of the attitude during insert molding. The inner edge of the edge,
which has been difficult to correct, can be reliably positioned on either side of the diaphragm.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a partially enlarged sectional view of a molding apparatus for a loudspeaker diaphragm
according to the present invention, FIG. 2 is an enlarged sectional view of the same part
according to another embodiment, and FIG. 3 is a sectional view of a conventional molding mold ,
Fig. 4 (^).
(13) is an enlarged sectional view showing an example of forming a diaphragm using a
conventional forming die. 11: Fixed type, 12: Cavity, 12X: Correction cavity, 12m: Upper surface,
12n: Inside, 12P: Outside, 13: Insert cavity 15: Movable type , 22... Edge 22 A.
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