JPH02101900A - Manufacture of speaker unit constitution member - Google Patents

Abstract

PURPOSE:To reduce cost and to improve performance and quality by forming a diaphragm cavity of a desired shape to a molding die having a cavity able to accommodate a molded voice coil bobbin, injecting a diaphragm material and forming them integrally. CONSTITUTION:A cavity X1 accommodating a coil bobbin 1 is provided to a stationary die K1, which is matched with moving die K2. A cavity X2 for injection molding of a diaphragm 2 is formed between the dies K1 and K2 and a gate G2 is formed in the cavity K1. As a diaphragm material, a polypropylene series composite material is used and a cone type diaphragm 2 is subject to insert molding to the voice coil bobbin 1. Through the constitution above, the manufacture process is simplified, the number of components is less, 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 speaker unit component, and more particularly, to a method of manufacturing a voice coil bobbin and a diaphragm of a speaker unit.

[Conventional technology]

A speaker unit, which is a typical audio device, consists of a diaphragm, a voice coil bobbin, a damper, an edge, a speaker frame that supports it, a driver unit, etc. All of these constituent members are independent, and ultimately they are assembled together and integrated. Most commonly, each component is integrated with an adhesive, which requires an adhesion process and a process of curing the adhesive.

[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, frame, and voice coil bobbin 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 brimer application process. The work of adhering the coil bobbin and the diaphragm is complicated and difficult. Therefore, the present invention attempts to simplify the work process by omitting the bonding process by bonding together the voice coil bobbin, which is another component adjacent to the diaphragm, when molding the diaphragm.

[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-formed voice coil bobbin,
This is characterized in that the two members are integrally molded by injecting the member material into the diaphragm cavity.

【Example】

Embodiments of the present invention will be described below with reference to the accompanying drawings. In these figures, the symbol l indicates the voice coil bobbin, and this voice coil bobbin l requires physical properties that conflict with the edge, and is molded from materials such as glass fiber (glassimide) impregnated with polyimide resin, kraft, Nomex, aluminum, etc. has been done. A cone-shaped diaphragm 2 for this voice coil bobbin 1
is molded using an insert molding method or a multicolor molding method. As the material of the diaphragm 2, a polyprone composite material (containing at least 5% of mica or carbon fiber), a liquid crystal polymer (trade name: Nippacurate, Econol), or the like is used. A cross-sectional view of a speaker unit using the speaker unit component 10 composed of the voice coil bobbin 1 and the diaphragm 2 obtained as described above 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 1 is located in the air gap of the magnetic circuit 20, the bobbin 1 is supported on the top plate 21 by a damper 33, and the speaker frame The peripheral edge 3A of No. 3 is fixed to the top plate 21 with screws. To perform injection molding as described above, a pair of molds 1 and 2 are used for the fixed molds, as shown in the partially enlarged cross-sectional view in FIG.
Two movable types 2. For example, the fixed mold 1 is formed with a bobbin cavity X1 that accommodates the voice coil bobbin l, the fixed mold 1 is combined with another movable mold 3, and the movable mold is A cone cavity X2 for injecting the diaphragm 2 is formed between the fixed mold 2 and the fixed mold 1, and the bobbin cavity X1 is provided with a gate G1. FIG. 2 is a partially enlarged sectional view of the air bobbin, FIG. 2 is a partially enlarged sectional view of the speaker unit, and FIG. 3 is a partially enlarged sectional view of the mold. ■...Voice coil bobbin 2...Vibration plate

【Effect of the invention】

As is clear from the above description, according to the method of manufacturing a speaker unit component of the present invention, a diaphragm is integrally injection molded to a pre-formed voice coil bobbin, and the two components are manufactured as one member. This simplifies the manufacturing process. Eliminating adhesives and their pre- and post-processing processes 1 Reduces costs by reducing the number of parts handled during assembly. It can contribute to uniformity of performance quality.

[Brief explanation of the drawing]

Claims (1)

[Claims] (1) A speaker characterized in that a diaphragm cavity of a desired shape is formed in a mold having a cavity capable of accommodating a pre-molded voice coil bobbin, and a component material is injected into the diaphragm cavity to integrally mold the two components. A method for manufacturing unit components.