JPH02101899A - Manufacture of speaker unit constitution member - Google Patents

Abstract

PURPOSE:To reduce cost and to uniformize quality by forming a diaphragm cavity of a desired shape to a molding die having a cavity able to accommodate a formed damper, injecting material and forming two members integrally. CONSTITUTION:A cavity X1 accommodating a damper 1 is provided to a stationary die K1, a cone cavity X2 to inject a diaphragm 2 is provided to a moving die K2 and a gate G2 is formed in the cavity K2. As a diaphragm material, a polypropylene series composite material is used and a cone type diaphragm 2 is subject to insert molding to the damper 1. Through the constitution above, an adhesive process is saved, the work process is reduced and the cost is reduced and the performance and quality are improved.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a method of manufacturing a component of a speaker unit, and more particularly, to a method of manufacturing a component of a diaphragm and a damper of a speaker unit.

[Conventional technology]

A speaker unit, which is a typical audio device, is composed of a diaphragm, a voice coil bobbin, a damper, an edge, a speaker frame that supports the edge, a single driver unit, and the like. All of these constituent members are independent, and ultimately they are combined and integrated. Most commonly, each component is integrated with an adhesive, which requires an adhesion process and a process of curing the adhesive. Furthermore, recently, the present applicant has proposed a method of integrally molding two members, a diaphragm and an edge (for example, Japanese Patent Publication No. 60-53518).

[Problem to be solved by the invention]

In the method of manufacturing the speaker unit as described above, the bonding process is essential, so the work cost is relatively high.
In addition to being expensive in terms of material costs, the performance may also be inferior. In particular, when the diaphragm, edges, and frame are molded using polypropylene-based synthetic resin, there are problems such as the need for a primer to increase adhesive strength and the need for a primer application process. There was also a work problem in that it was difficult to apply adhesive to the diaphragm. Therefore, the present invention aims to simplify the work process by integrally molding the diaphragm and the damper during molding of the component, thereby omitting the bonding process.

[Means to solve the problem]

In order to achieve the above-mentioned object, the present invention forms a diaphragm cavity of a desired shape in a mold having a cavity capable of accommodating a pre-molded damper, and injects member material into the cavity to form two members. It is characterized by being integrally molded.

【Example】

Embodiments of the present invention will be described below with reference to the accompanying drawings. In these figures, the symbol l indicates a damper, and this damper 1 is made of natural fibers such as Cornec, cotton, or a mixture of Cornec and cotton (blend), and artificial fibers with thermosetting resin (mainly phenol). It is impregnated with water and then hot pressed and molded. A cone-shaped diaphragm 2 is molded onto this damper 1 by insert molding or multicolor molding. As the material of the diaphragm 2, a polyprone composite material (containing at least 5% of mica or carbon fiber) or a liquid crystal polymer (trade name: Nippa Curate, Econol) is used. Note that numeral 4 indicates an edge. Damper 1 obtained as described above. A cross-sectional view of a speaker unit using a component lO of a speaker unit constituted by a diaphragm 2° and a speaker frame 3 is shown in FIG. In this figure, reference numeral 20 indicates a top plate 21° magnet 22. York 23. A voice coil 32 wound around a bobbin 31 is located in the air gap of the magnetic circuit 20, and the bobbin 31 is supported by the top plate 21 by a damper 33. The peripheral edge 3A of No. 3 is fixed to the top plate 21 with screws. In order to carry out the injection molding as described above, a pair of molds as shown in a partially enlarged sectional view in FIG. For example, the fixed mold 1 is formed with a damper cavity X1 for accommodating the damper, the movable mold 2 is formed with a cone cavity X2 for injecting the diaphragm 2, and the cone cavity Gate G for X2
2 is provided. FIG. 2 is a partially enlarged sectional view of a speaker frame etc., FIG. 2 is a partially enlarged sectional view of the speaker unit, and FIG. 3 is a partially enlarged sectional view of the same molding die. ■ Damper 2 Vibration plate 3 Speaker frame 4 Edge [Effects of the invention] As is clear from the above description, according to the method for manufacturing speaker unit components of the present invention, pre-formed The diaphragm is integrally injection-molded with the damper, and the two parts are manufactured as one, which simplifies the manufacturing process and eliminates the need for adhesives and their pre- and post-processing processes. 2. It can contribute to cost reduction and uniformity of performance and quality by reducing the number of parts handled during assembly.

[Brief explanation of the drawing]

Figure 1 shows the damper and diaphragm obtained by this invention.

Claims (1)

[Claims] (1) A speaker unit configuration characterized in that a diaphragm cavity of a desired shape is formed in a mold having a cavity capable of accommodating a pre-molded damper, and a member material is injected into the cavity to integrally mold the two members. Method of manufacturing parts.