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JPH02101899

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DESCRIPTION JPH02101899
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
method of manufacturing a speaker unit component, and more particularly to a method of
manufacturing a component of a diaphragm and a damper of a speaker unit. 2. Description of the
Related Art A speaker unit, which is a typical acoustic device, is composed of a diaphragm, a
voice coil bobbin, a damper, an edge, a speaker frame for supporting the same, a single lever
unit, and the like. All of these constituent members are independent, and finally, the respective
constituent members are combined and integrated with each other. Most commonly, a bonding
process and a process of cleaning the adhesive are required in order for the respective
components to be integrated by the adhesive. Recently, the present applicant has proposed a
method of integrally forming two members of a diaphragm and an edge (e.g., Japanese Patent
Publication No. S60-53518). In the method of manufacturing a speaker unit as described above,
since the bonding process is indispensable, the operation cost becomes expensive, and the cost
as the material cost is increased, and the performance is also inferior. was there. In particular,
when the diaphragm, the edge, and the frame are formed using a polypropylene-based synthetic
resin, there is a problem that a primer is required to increase the adhesive strength, and the
application process of the primer is also required. There is also a problem in work that it is
difficult to perform bonding work on the diaphragm. Therefore, the present invention is intended
to simplify the working process by omitting the bonding process by integrally molding the
diaphragm and the damper at the time of molding the component members. SUMMARY OF THE
INVENTION In order to achieve the above object, the present invention forms a diaphragm cavity
of a desired shape in a mold having a cavity capable of accommodating a preformed damper, said
cavity It is characterized in that the member material is injected to integrally form the two
members. Embodiments of the present invention will be described below with reference to the
attached drawings. In these figures, the symbol l indicates a damper, and this damper 1 is a
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natural resin such as conneck, cotton, or a mixture of conneck and cotton (blend), and a
thermosetting resin (mainly phenol) for artificial fibers. Is impregnated, heat-pressed and molded.
A cone-shaped diaphragm 2 is formed on the damper 1 by an insert molding method or a
multicolor molding method. As a material of the diaphragm 2, a polypropylene-based composite
material (mica or one containing at least 5% or more of a carbon fiber), a liquid crystal polymer
(Nippacurate, trade name), etc. are used.
Reference numeral 4 indicates an edge. Damper obtained as described above 1. The crosssectional view of the speaker unit using the component member 10 of the speaker unit
configured by the diaphragm 2 ° speaker frame 3 is shown in FIG. In this figure, reference
numeral 20 denotes a top plate 21 ° magnet 22. ヨーク23. A voice coil 32 wound on a
bobbin 31 is positioned in an air gap of the magnetic circuit 20, and the bobbin 31 is supported
by the damper 33 on the top plate 21 in the air gap of the magnetic circuit 20. The speaker
frame The peripheral portion 3A of 3 is screwed to the top plate 21. In order to carry out the
injection molding as described above, a pair of molds as shown in a partial enlarged crosssectional view in FIG. For example, a damper cavity X1 for accommodating a damper [a] is
formed in a fixed mold, a cone cavity X2 for injecting the diaphragm 2 is formed in a movable
mold 2, and a cone cavity A gate G2 is provided on X2. FIG. 2 is a partial cross-sectional view of
the speaker unit in a state in which it is used as a speaker unit, and FIG. 3 is a partial enlarged
cross-sectional view of the molding die. {Circle over (2)} Damper 2 ... diaphragm 3 Speaker frame
4 ... edge [Effects of the invention] As is apparent from the above description, according to the
method of manufacturing a speaker unit component of the present invention, it is molded in
advance. Since the diaphragm is integrally injection-molded to the damper and the two members
are manufactured as one member, the simplification of the manufacturing process, the adhesive,
and the pre-processing and post-processing steps are omitted. (2) It can contribute to cost
reduction, such as the reduction in the number of parts handled on assembly, and uniform
performance quality.
[0002]
Brief description of the drawings
[0003]
FIG. 1 shows the damper and diaphragm obtained by the present invention.
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