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BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
diaphragm for a speaker having a display with good appearance and durability. [Prior Art]
Conventionally, a company mark on a diaphragm or dust cap on the front of a speaker, a product
name indication, etc., are heated in a symbol pattern by heating a foil provided with a metal layer
as described in, for example, There is a method in which the metal layer is transferred to the
surface of a diaphragm or the like by pressure to be pressure bonded, or a method in which a
seal is attached. [Problems to be Solved] The conventional display means having such a structure
is poor in the durability, and has the disadvantage that the workability is not good such as
requiring extra man-hours for the display. . An object of the present invention is to solve the
problems of the above-mentioned conventional example by integrally molding a display portion
made of metal in a diaphragm made of a thermosetting resin. [Means for Solving the Problems]
The speaker diaphragm according to the present invention for achieving the above-described
object will be described with reference to FIGS. In the speaker diaphragm in which the
thermosetting resin is cured by using a mold resin and curing the thermosetting resin by molding
under pressure, the display mark 2 obtained by processing a thin metal plate or metal foil by
etching or the like is formed The display mark 2 is placed on the surface of the substrate 1 of the
diaphragm by placing it on the surface of the prepreg 3 to be the diaphragm substrate 1 later
and integrally heating and pressing it with the mold 4.4 ′. A speaker diaphragm characterized in
that it is fixed. [In the case of a diaphragm with a configuration like an eyelid and a hammer, the
indication mark is integrally formed with the diaphragm substrate, so that the workability is good
and the manufacturing cost can be reduced, and the indication mark is made of metal. Therefore,
it has excellent wear resistance and corrosion resistance. [Embodiments] The embodiments of the
present invention will be described in detail with reference to FIGS. 1 to 3. FIG. 1-- is the front of
the diaphragm of the present invention, and 1-- is a base material constituting the diaphragm
main body A filler obtained by impregnating or applying a thermosetting resin to a filler made of
fibers or the like is temporarily made into a prepreg, which is heated and pressed to cure and
form. In the same figure, 2 is a display mark. Fig. 2 shows an example of the indication mark,
which is formed integrally by etching a thin metal plate or foil of brass, stainless steel or the like
(for example, in the case where the indication mark or a plurality of characters are included, it
becomes a series). It is FIG. 3 shows a process of forming the diaphragm, in which the uncured
prepreg 3 of the base material and the display mark 2 are overlapped and integrally pressed and
heated by the mold 4 and 4 ', The display mark 2 is pressed by the prepreg 3 (= 1), and when the
thermosetting resin of the prepreg 3 is cured by heating, the display mark 2 is fixed to the
surface of the diaphragm by the adhesive force of the thermosetting resin.
In the above-described embodiment, etching is exemplified as the means for producing the
indication mark 2, and in addition to this, it can not be used as the indication mark of the present
invention even by punching using a press. As mentioned above, although the speaker diaphragm
according to the present invention has been described in detail on the basis of the embodiment
considered to be representative, the embodiment of the diaphragm according to the present
invention is not limited to the structure of the above embodiment. As long as it has the
constituent features described in the claims of the present invention, exhibits the effects of the
present invention, and has the effects described below, the present invention is appropriately
modified and implemented. [Effects] The speaker diaphragm according to the present invention
has a very good appearance because the boundary between the displayed characters and the like
and the surrounding diaphragm substrate is sharp and does not disappear due to friction etc. In
addition, it is characterized by being easy to manufacture.
Brief description of the drawings
1 is an external view of the diaphragm of the present invention, FIG. 2 is a front view of an
example of display marks used for the diaphragm of the present invention, and FIG. 3 is a crosssectional view showing a molding state.
1 is a diaphragm substrate, 2 is a display mark, 3 is a prepreg, 4 and 4 'are molds for molding,
and 5 and 5' are heaters. Patent applicant Onkyo Co., Ltd.