JPH02209215A - Die device of diaphragm for speaker - Google Patents

Abstract

PURPOSE:To enable extremely simple injection molding of a diaphragm with edge by a single mold, by a method wherein a center core forming a diaphragm cavity is made into a structure where a communicating part between the diaphragm cavity and an edge cavity can be moved by opening and closing the same. CONSTITUTION:A movable mold 21 is registered to a stationary mold 11, a diaphragm cavity 12 is held under a closed state with a center core 22 and resin becoming an edge materied E is injected into an edge cavity 13 through a gate 13A. A communicating parts 12A between the edge cavity 13 and diaphragm cavity 12 is closed with an outer circumferential surface 22A of the center core 22 and it does not happen that the edge material E is injected into the diaphragm cavity 12. After injection of the edge material E, the center core 22 is moved by a fixed stroke S and a diaphragm material B is injected through a gate 11A under a state where a communication part 12A with the aleady injected edge cavity 13 is opened by the diaphragm cavity 12 and edge material E. The injected diaphragm material B is integrated with the edge material E at an end face of the edge material E.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a molding device for a diaphragm for a speaker, and more particularly to a molding device that can integrally form a diaphragm and an edge.

[Conventional technology]

The diaphragm l is surrounded by a gasket 3 via an edge 2.
The edge 2 that supports the diaphragm 1 and is attached to the speaker frame 4 is manufactured in a separate process from the diaphragm 1 and is integrated with the diaphragm 1 in the final process (Fig. 4 (B)). ).

The outline of the manufacturing process is shown in Fig. 4 (A), and the diaphragm l is made from beaten pulp using a papermaking mold LA, which is heat-dried and then released from the mold to form a single diaphragm. The prepared woven fabric 2^ is coated with resin 2B and then aged.
The desired diaphragm 1 is obtained by pasting the edge 2 onto a single edge by punching or the like.

[Problem to be solved by the invention]

In the manufacturing method described above, the manufacturing process of a single diaphragm,
There was a major problem in that the manufacturing process for EDGE was performed through a different route, and a process to integrate the two was required, resulting in a multi-step manufacturing process.

Therefore, if the diaphragm and the edges are integrally molded from resin, the manufacturing process will be extremely simple, but since the required functions of the diaphragm and the edges are different, it will not be possible to obtain a diaphragm that is acoustically satisfactory. .

At present, a manufacturing method in which the diaphragm and the edges are integrated by insert molding is also used, but this is similar to the conventional example in that the edges must be molded in advance, and There was a problem that the mold became complicated.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a molding die device for a speaker diaphragm that can efficiently manufacture diaphragms made of different materials and edges using a single molding die.

The inner core is movable to close the communication portion between the diaphragm cavity and the edge cavity, and is characterized in that it is configured to be movable with a stroke corresponding to the thickness of the diaphragm.

[Function] When the edge is ejected, the movable center core moves into the diaphragm cavity and closes the communication part between the edge cavity and the diaphragm cavity, and after the edge is ejected, the center core moves to its original position and closes the diaphragm cavity. The resin used as the diaphragm material can be injected to obtain an integrated diaphragm and edge.

[Means to solve the problem]

In order to achieve the above-mentioned object, the present invention combines a fixed mold with a movable mold, has a cavity for a diaphragm and an edge, and injects resin into both cavities to mold a diaphragm for a speaker. In the mold device, the diaphragm cavity is continuous with the edge cavity, and the cavity forming the diaphragm cavity is shown in FIGS. 1 to 3 of the accompanying drawings showing embodiments of the present invention. I will explain along. First, in these figures, the reference numeral 11 indicates a fixed type, which has a diaphragm resin 1 (for example, polypropylene) 11^, and an edge cavity 13 is formed continuously to the diaphragm cavity 12. Edge cavity 13 is edge resin 1
For example, it communicates with a gate 13^ through which elastomer resin is injected.

A movable mold 21 is prepared for the fixed mold 11, and has a cavity common to the edge cavity 13 of the fixed mold 11 and the diaphragm cavity 12 along the parting line of both molds. The movable mold 21 that forms the
2, and the outer diameter of the center core 22 is the diameter of the diaphragm cavity 1.
2, and can move linearly with a stroke S corresponding to the depth of the diaphragm cavity 12.

The outer peripheral surface 22A of this center core 22 is
By this movement, the communicating portion 12^ between the edge cavity 13 and the diaphragm cavity 12 can be closed.

Next, manufacturing operations using the molding device for a speaker diaphragm according to the present invention will be explained in order.

First, the movable mold 21 is aligned with the fixed mold 11, the diaphragm cavity 12 is held in a closed state by the center core 22, and the resin to be the edge material E is injected into the edge cavity 13 from the gate 13^. In this case, the center core 22
Since the communication portion 12A between the edge cavity 13 and the diaphragm cavity 12 is closed by the outer peripheral surface 22^, the edge material E is not injected into the diaphragm cavity 12.

After the edge material E is injected, the center core 22 is moved by a predetermined stroke S, and the diaphragm material B is opened in a state where the communication portion 12A between the diaphragm cavity 12 and the edge cavity 13 into which the edge material E has been injected is opened. Inject.

The injected diaphragm material B is integrated with the edge material E at the end face thereof.

〔Effect of the invention〕

As is clear from the above description, according to the molding device for a speaker diaphragm of the present invention, the center core forming the diaphragm cavity can be moved by opening and closing the communication portion between the diaphragm cavity and the edge cavity. With this structure, the diaphragm made of edge material can be injection-molded extremely easily using a single molding die, contributing to a reduction in manufacturing costs.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a molding device for a speaker diaphragm according to the present invention, Fig. 2 is a partially enlarged view of Fig. 1, Fig. 3 is a sectional view showing the molding process, and Fig. 4 is a conventional molding method. It is an explanatory diagram of a process. 11...Fixed type, 12...Diaphragm cavity, 1g
... Edge cavity 21... Movable type, 22... Center core, 22^...
・Communication part, S...Moving stroke patent applicant Pioneer Co., Ltd. agent Patent attorney Makoto Kobashi Slag amount

Claims (1)

[Claims] (1) In a speaker diaphragm molding device that combines a fixed mold with a movable mold, has a cavity for the diaphragm and an edge, and injects resin into both cavities, the diaphragm cavity is the edge cavity. The center core, which is continuous and forms the diaphragm cavity, is movable to close the communication part between the diaphragm cavity and the edge cavity, and is configured to be able to move with a stroke corresponding to the thickness of the diaphragm. Molding mold equipment for speaker diaphragms.