JPS5848598A - Diaphragm molding device for speaker - Google Patents

Abstract

PURPOSE:To prevent defective molding for edge, by providing an elastic substance for a part corresponding to the edge of a top metallic mold constituting a molding device for a diaphragm. CONSTITUTION:A waved part 11 is formed at the circumference of a bottom metallic mold 9 having a recess 10 of inverse circular truncated cone at the center. An upper metallic mold 12 has a projection 13 of inverse circular cone shape at the lower center and an elastic substance 15 such as silicon system rubber with a waved part 14 is coupled with a circumference of the projection 13. Through this constitution, a sheet having a thin edge 2 and a thick cone 1 is set on a metallic mold 9, the metallic mold 12 is dropped and the elastic substance 15 of the metallic mold 12 contacts the edge 2 to form the edge 2 in waved shape. Further, the cone part 1 is molded through the dropping of the metallic mold 12.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a molding device for a speaker diaphragm in which edge portions and cone portions have different surface thicknesses.

In general, a speaker diaphragm is formed with a cone portion 1 and an edge portion 2 having different surface thicknesses, as shown in FIG. That is, the configuration is such that the surface thickness of the edge portion 2 is made sufficiently thinner than the surface thickness of the cone portion 1 to increase compliance and allow the cone portion 1 to vibrate sufficiently.

Conventionally, a molding apparatus for such a speaker diaphragm was constructed as shown in FIG. In other words, a lower mold 6 having a truncated conical recess 3 and a corrugated portion 4 on the periphery of the recess 3, a truncated conical protrusion 6 and a periphery of the convex 60. A sheet consisting of an upper mold 8 having a corrugated portion 7 and having an edge portion 2 and a cone portion 1 having different surface thicknesses is placed on the lower mold 6. Then, the stopper die 8 is lowered and molded into a predetermined shape.

In this case, the truncated conical convex portion of the upper mold 8 hits the cone portion 1 and is therefore molded first, and the wavy portion 7 of the upper mold 8 does not appear on the edge portion 2 with a thin surface thickness. Become. That is, the gap H between the thickness finishing mold 8 and the lower mold 6 of the cone portion 2 is opened.

For this reason, molding defects in the edge portion 2 tend to occur, making it impossible to obtain a stable speaker diaphragm.

The present invention eliminates the above-mentioned conventional drawbacks, and aims to provide a speaker diaphragm molding device that can obtain a stable speaker diaphragm without molding defects. It is.

In order to achieve the above object, the present invention has a structure in which an elastic body is provided in the part corresponding to the edge part of the upper mold, and the elastic body first hits the edge part and then molds the edge part. The present invention relates to a speaker diaphragm molding device that molds a cone portion.

Hereinafter, an embodiment of the present invention will be explained with reference to FIG. 3. 9
The lower mold has an inverted truncated conical recess 10 in the center of its upper surface, and a corrugated part 11 is formed at the periphery of this recess 1o.

In contrast to the lower mold 9, the upper mold 12 has an inverted truncated cone-shaped convex part 13 at the center of the lower surface, and a silicone rubber or urethane rubber having a corrugated part 14 at the periphery of this convex part 13. An elastic body 16 made of rubber or the like is bonded together.

With this configuration, when a sheet with a thin edge part 2 and a thick cone part 1 is set on the lower mold 9 and the upper mold 12 is lowered, the elastic body 16 of the stopper mold 12 comes into contact with the edge part 2. contact,
First, the edge portion 2 is formed into a wave shape. After that, upper mold 1
The cone portion 1 is formed by the lowering of the cone portion 2.

Since the speaker diaphragm molding apparatus of the present invention is configured as described above, it is possible to reliably mold sheets with any difference in surface thickness between the cone portion and the edge portion, thereby producing a stable speaker diaphragm. This method is of great industrial value because it does not cause molding defects and has a high product yield.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a general speaker diaphragm, FIG. 2 is a sectional view of a conventional speaker diaphragm molding device, and FIG. 3 is an embodiment of the speaker diaphragm molding device of the present invention. FIG. 9... Lower mold, 1o... Inverted truncated cone-shaped recess, 11... Wave-shaped part, 12... Upper mold, 13... ...inverted truncated cone-shaped convex portion, 14...
... Wave-shaped part, 16 ... Elastic body.

Claims (1)

[Claims] The lower mold has an inverted truncated cone-shaped recess at the center of the upper surface, a corrugated part at the periphery of this recess, and an inverted truncated cone-shaped convex part at the center of the lower surface, and a lower mold at the periphery of this convex part. A speaker diaphragm molding device comprising an upper mold having an elastic body provided with a corrugated portion.