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BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker edge, and more particularly to a non-directional speaker edge. [Background Art] An edge,
which is one of the components of a speaker unit, has a function to support the peripheral edge
of a diaphragm without impeding the piston movement of the diaphragm and to airtightly
partition the diaphragm and its pack chamber together with the diaphragm. One of the wellknown speaker edges is the roll edge. This roll edge can not only follow the piston movement of
the diaphragm, but is also required to be light enough not to be a braking load of the diaphragm.
An example of a roll edge that is widely used recently will be described with reference to FIG.
Although the edge is a donut shape, only the cross-sectional shape is schematically shown in this
figure, and the symbol l indicates the urethane foam material which is the edge material. [I] This
urethane foam material is appropriately cut and edged. The material 2 is heat-formed by a pair of
molding dies 3.4 (in the same figure [■]) to obtain an edge raw material 5 which is an
intermediate product (the same figure [[]]). Since rim portions 5A 5 [3 of thick thickness are left
on the outer peripheral edge and the inner peripheral edge of this edge material 5 respectively,
edge 6 is removed by removing rims 5 ^ and 5B by edge processing (i Figure [IV]). [Problems to
be Solved by the Invention] The conventional edge as described above requires trim processing
after heat-forming the edge material 2, and the part to be the waste material after the trim
processing is large and the part to be wasted There was a big problem. Therefore, the present
invention is intended to provide an edge which can be easily molded and processed while having
a satisfactory function as an edge. [Means for Solving the Problems] In order to achieve the
above-mentioned purpose, an edge core material formed of a material with little directionality is
inserted into a molding die, and an elastomeric resin is injection molded in its cavity. It is
characterized in that it comprises. Preferred embodiments of the present invention will now be
described with reference to FIGS. 1 to 3 of the accompanying drawings. In these figures, the
reference numeral IO denotes an edge represented by a roll edge, which is obtained by insert
molding the end core material 11 using the resin 12 in the form of an elastomer. This edge core
material 11 is obtained by forming pulp into a pulp, and although it is difficult to maintain the
shape of the elastomer resin alone, the edge core material 11 can maintain the given shape, so
this edge core material 11 serves as an edge. Because the edge core material 11 is air-permeable,
the air-hole is clogged with an elastomeric resin.
Further, since this edge core material 11 is non-directional, it is rich in flexibility in combination
with the fact that the elastomeric resin is rich in elasticity, and an edge which is not a load on the
diaphragm can be obtained. Next, the manufacturing process of this edge 10 will be described.
The end core 11 is obtained by pulp papermaking, and this end core 11 is inserted into the cavity
K formed by the mold 21.22 of the end, and then the resin G 12 is ejected from the gate G. By
doing this, the edge core material 11 is covered with the resin 12 on the entire surface. In the
above examples, the end core material 11 was obtained by pulping it. However, this end core
material l is immersed in a non-woven fabric with a thermosetting resin, heated and pressed to
form an end shape. It may be [Effects of the Invention] As is apparent from the above description,
according to the speaker edge of the present invention, the elastomeric resin is injected by the
mold into which the edge core material for holding the shape of the edge is inserted. As it is
configured, the composite material of the elastomeric resin and the edge core material can
maintain the ideal shape as the edge, and also the elasticity required as the edge can be obtained,
and the manufacturing process is simple, etc. effective.
Brief description of the drawings
1 is a sectional oblique view of the speaker edge according to the present invention, FIG. 2 is an
enlarged sectional view of FIG. 1 and FIG. 3 is an explanatory sectional view of a mold for
producing the speaker edge, FIG. These are explanatory drawings which show the manufacturing
process of the conventional edge for speakers.
lO: Edge 11: Edge core 12: Elastomer-like resin.
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