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JPS56147688

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Notice
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DESCRIPTION JPS56147688
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of the main part of a
vibration system of a conventional high-fidelity reproduction speaker filled with foam, and FIG. 2
is an enlarged cross-sectional view of the diaphragm peripheral part in FIG. FIG. 3 is a crosssectional view for explaining how the foam in the speaker of FIG. 1 is filled and cut, FIG. 4 is an
enlarged cross-sectional view of the main part of the vibration system of the speaker according
to the present invention, FIG. 5 is a cross-sectional view for explaining how a foam is filled and
cut in the speaker of FIG. 4; (Symbol explanation), 1 ..... Diaphragm, 5.5 '..... Foam, 9, ..... Hot wire,
10 ..... Insulator.
DETAILED DESCRIPTION OF THE INVENTION The present invention is embodied in a speaker for
high fidelity reproduction in which a hollow portion of a conductive diaphragm is filled with
foam. One of the requirements for a high fidelity speaker is the flattening of the sound wave
emitting surface. As a technology to realize this, the foaming rate in the hollow portion formed by
the diaphragm of the speaker The technology of filling high foam is known. FIG. 1 is a crosssectional view showing the main part structure of the vibration system of such a conventional
foam-filled speaker, and FIG. 2 is an enlarged cross-sectional view of the main part in FIG.
Referring to FIG. 1 and FIG. 2, a diaphragm 1 has a bobbin 2 and a cap 5 at its center and an
aerial 4 at its periphery. In the depressed portion of the diaphragm 1, the filler 5 is filled via the
coating @ 7 to form a flat sound wave emitting surface 6. The front end 8 of the diaphragm is a
corner, and as shown in FIG. 2, coating of a coating for strengthening the adhesion between the
filler 5 and the diaphragm 1 is performed until this position l11. The cut surface of the
diaphragm is not applied, and therefore, its tip s8 is one electrical Kll when the diaphragm is a
conductor such as a gold rod. FIG. 5 is an explanatory view for explaining a state in which a foam
is fully blown to a main part of an imaging system of the speaker of FIG. 1 and cut. In order to fill
the foam in the same figure, first, the depressions of the diaphragm 1 are filled with the foams 5,
5 ', and then the foam is cut to form the sound emitting surface 6, but Use a heating wire 9 of
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which temperature is raised by supplying a current to nichrome a etc. When the diaphragm is a
conductor such as metal, the conductor diaphragm 1 and the heating wire 9 are in contact at the
diaphragm tip 1 8 Conductors that cause an electrical short-circuit condition and cause a failure
of hot wire power equipment and spark sparks C (due to the burning of the foam 5 as a result of
which the work becomes unstable and dangerous) There is a structural disadvantage of the
diaphragm. Accordingly, the present invention aims at eliminating the structural drawbacks of
the above-mentioned speaker vibrating thread, in particular the diaphragm. As a result, it is
possible to achieve a stable and safe operation, facilitate mass production of speaker units, and
achieve a large cost reduction. According to this invention, the above-mentioned purpose can be
achieved by insulating the collar fore end portion of the diaphragm so that the diaphragm and
the heat wire do not electrically contact with each other.
Hereinafter, the present invention will be described with reference to the drawings. FIG. 4 is a
book showing an enlarged cross-sectional view of the vicinity of the diaphragm tip 4 of the
speaker. In the figure, reference numeral 1 denotes a diaphragm made of a conductor, and
reference numeral 7 denotes a coating for strengthening the adhesion between the foam 5 and
the diaphragm 1 and may be omitted in some cases. 10 is an insulator layer provided according
to the present invention, suitably formed by the diaphragm 10 at the tip 1 portion 81C, so that
the same edge tip of the diaphragm is heated so that cutting of the foam by the heat wire can be
performed stably and safely. In contrast, all the electrical insulation is done. The melting
temperature Ti of the insulator 10 is selected so as to satisfy the relationship of T,> T with
respect to the bath melting temperature T of one foam, and used. FIG. 5 is a view showing how
the foam is totally cut in the vibration system of the loudspeaker according to the present
invention. In order to form a flat sound wave emitting surface 6 by filling it in the depression of
the diaphragm 1 constituting the vibration system of the speaker shown in FIG. After that, move
the heating wire 9 whose temperature has been raised by flowing a pressure current such as a
nichrome wire along the insulator layer 10 formed at the same edge of the diaphragm to
thermally dissolve the 4 foams, It is cut into 5 'to make the surface flat. The temperature T of the
heat ray is selected so as to satisfy the relationship of T □> Th> T. As described above, according
to the present invention, the conductor diaphragm 1 and the heat a9 are electrically iII! Because
it is torn down, compared with the conventional electrically noodleed one, there is no short
circuiting during the cutting operation, and since the hot wire can be moved along the
diaphragm, the filling body Since the cut surface of the speaker becomes flat and it is possible to
cut after the inclination of the diaphragm depending on the situation, the quality of the speaker
vibration system can be reduced. Therefore, according to this invention, it becomes possible to
manufacture the foam filled speaker more stably and safely than the conventional one, and
therefore the risk of fire and the like at the time of l1 kl construction is also avoided, and at the
same time the outside of the speaker It has the advantage of improving performance and the like
without damage.
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