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BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
method of manufacturing a diaphragm for a speaker, and more particularly to a method of
manufacturing a laminated diaphragm for a speaker. 2. Description of the Related Art A method
of manufacturing a speaker diaphragm most frequently employed is an edge member as shown
in the flow chart of FIG. 3 and in the partially enlarged sectional view of the diaphragm of FIG. 1
and cone portions (i.e., separately molding the pieces 2 and bonding them together using the
agent 3). II. That is, the edge member l is cut in a first step S1 and is formed and processed by
pressure heating or the like in a second step S2, and then the inner and outer diameters are
trimmed in a third step 11W S3. It is obtained by On the other hand, the cone part 2 is injection
molded using a mold in the first step SA, and in the second step S11, the inner diameter and the
outer diameter of the outer diameter! -The rim is applied, and the application of the weak agent
is performed on the peripheral portion at about SC 3-. The edge member 1 and the cone member
2 which are separately formed in each operation step are integrated with each other using a
pressure heating mold in the laminating step. [Problems to be Solved by the Invention] In the
method of manufacturing a diaphragm as described above, there are many working steps, and in
addition, the step of applying a water rejuvenating agent is bothersome, and furthermore, this
J2E a portion is pressurized and heated In the case of the product, there is a problem that the
solder agent causes an appearance defect due to the appearance. Therefore, the present
invention is intended to reduce the number of working processes and to easily control the
characteristics of the diaphragm and to obtain a diaphragm having a good appearance. [Section;
means for solving j] In order to achieve [I] as described above, the present invention injects a
combination of a cone and an edge obtained by pressure and heat forming in advance. Inserter 1L, to the mold! The cone cylinder is integrally formed with the combination by injecting into the
cone-shaped cavity of the 'i, J mold and the meat of the cone body II1. Is characterized in that the
shape gradually decreases from the center to the periphery. Embodiments of the present
invention will be described below with reference to FIGS. 1 and 2 of the accompanying drawings.
First, a combined body IO in which the edge 11 and the cone 12 are integrated is formed. First,
the material 1-) m is cut in the first step S11, and pressure heating molding is performed in the
second step S12! ! ! 12A。 121. Process the C shape and trim the outer diameter in the third
step S3. The resulting bonded body 10 is then inserted in the cavity 14X of the injection molds
14A and 14B in the fourth step 5171.
This cavity 14X has a cavity 14Y which can be layered on the upper layer of the cone of the
combination 10, and the cone cylinder 14 is integrally formed on the upper layer of the cone 12
of the combination 10 by injection from the gate 1-104. Then, the inside diameter is trimmed in
the fifth step S5 to obtain a speaker diaphragm. In this speaker diaphragm, since the edge
portion 11 and the cone portion 2 are formed of a single material to form a combined body (1.),
the characteristic control 011 is the cone portion 12 of the combined body 10 The thickness and
material of the cone cylinder 14 to be layered are selected. In this embodiment, in order to
suppress the divided vibration in the cone, the thickness of the cone cylinder 14 is set to a shape
which is thickened at the central portion and gradually decreases toward the peripheral portion.
The cone cylinder 4 may be formed on the outside of the cone portion 12 instead of the inside
thereof. As is apparent from the above description, according to the method of manufacturing a
loudspeaker diaphragm of '0 M, the combination of the edge and the cone is integrated with the
cone. Since the cone cylinder is provided with ICi by the insert structure 13, the thickness of the
diaphragm can be determined arbitrarily, and the characteristic control is compared by making
the thickness of the con-shaped neck f11 thick and making the outer peripheral portion thin. Is
Brief description of the drawings
1 is a flow chart showing the manufacturing method of the present invention, FIG. 2 is an
explanatory view of the respective steps, FIG. 3 is a flow chart): FIG. It is a partially expanded
sectional view.
[N ... material also [, 10 ... bonded body, 11 ... edge portion, 12 ... cone portion, 12A, 1213 ...
molding die, 14A, 1411 ... injection molding die, 14X, 14Y: cavity, G14: gate. ro
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