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JPS5486131

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Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JPS5486131
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic cross-sectional view with a partial
omission showing a structure of a vibration system of a speaker using a conventional diaphragm,
and FIG. 2 is a sand-inch according to an embodiment of the present invention. It is the same
(generally shown sectional drawing) which shows the speaker using the diaphragm which has a
structure. FIG. 3 is a schematic cross-sectional view of a speaker (same, showing another
embodiment). In the figure, the same reference numerals indicate the same or corresponding
parts, 1 is a central magnetic pole, 4 is a voice coil, 7 is a lead of a voice coil, 8 is a diaphragm of
sandwich structure, 9 is an insulator, 10 is an insulation coating Layer 11 is a conductor.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a loudspeaker
having a cone-shaped and a diaphragm of a so / ditch structure. In recent years, various
innovations have been made in speakers along with advances in audio equipment technology.
Above all, the diaphragm is changed to a diaphragm made of natural pulp, which has been the
mainstream in the past, and the specific elastic modulus E / (B: elastic modulus): density is as
large as possible There is a direction in which a diaphragm having a proper internal loss (tan δ)
for smoothing frequency characteristics in the high range is adopted. As a diaphragm meeting
these requirements, a sandwich structure in which an outer cover material is adhered to both
surfaces of an aluminum mesh, a honeycomb, a hard polyurethane foam or the like as a core
material is represented. As the surface material, a mixture of natural pulp and carbon fiber,
graphite fiber 1, reinforced plastics, aluminum plate 6, gold foam, aromatic holiamide fiber, etc.
are used. Is mainly conductive except for some special organic materials. On the other hand, the
diaphragm made of natural pulp conventionally used is a book having insulation. The structure of
a speaker using a conventional natural pulp diaphragm will be described with reference to FIG.
FIG. 1 is a schematic cross-sectional view with partial omission showing a structure of a vibration
system of a speaker using a conventional diaphragm. Figure K + +1) is a central magnetic pole
42) is a concentrically arranged yoke with a suitable interval around the central magnetic pole,
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which is to create a cylindrical magnetic field. is there. A voice coil bobbin +3) is concentrically
disposed in the same manner in the space between the central magnetic pole port and the yoke i,
and C4) is a voice coil wound around the povin. (S> Fi is a spider for correctly holding the voice
coil in the magnetic field; 1111 is a conical diaphragm; (7) a fi voice coil + 41 a diaphragm (@) is
pulled out through the diaphragm It is a voice coil lead wire. As described above, the diaphragm
(6) is penetrated, and the lead wire of the F, I (3) coil (in the speaker structure for drawing n, a
small hole is provided in a part of the diaphragm and a braid without insulation coating There
was no problem in practical use by passing the copper wire. However, in order to perform lead
wire attachment with the same structure as the conventional one using a diaphragm made of a
paper conductive material as described above, a lead wire with an insulation coating is used
because it is necessary to insulate from the diaphragm. There must be.
In this case, depending on the covering material, an undesirable phenomenon such as hindering
the flexibility of the braided copper wire occurs. Furthermore, when compared to the natural
pulp, the above 5 conductive materials have higher 1 elastic modulus and therefore higher
hardness, so the lead wire penetration part of the diaphragm leads to a lead wire. It is expected
that the insulation coating may be damaged by rubbing with the diaphragm and the lead wire
may be damaged if it is further advanced. The present invention is to provide a speaker in which
the above-mentioned drawbacks are eliminated in the case of using a diaphragm made of a
conductive material which is in a direction used in recent years. FIG. 2 is a schematic crosssectional view showing a speaker employing a diaphragm having a sandwich (4) i structure
according to an embodiment of the present invention. In the figure, the same reference numerals
as in FIG. 1 indicate the same or equivalent parts, and the description thereof will be omitted. (8)
9 is a diaphragm having a sandwich structure formed by bonding double-sided KFRP skin
material (8b) of a core material (8a) such as aluminum honeycomb 9; (9) is fixed to a hole
provided in the diaphragm As a cylindrical insulator, it is also possible to prevent the contact
between the lead wire and the diaphragm (8) by passing the lead wire (7) of the voice coil
through the hollow portion of the insulator. 9) In the speaker diaphragm made of a conductive
material, insulation is achieved by penetrating the lead wire (7) of the voice coil through the
insulator (9) to the hole provided on the diaphragm (II) K Whether an uncoated braided copper
wire can be used, it does not impair the flexibility of the voice coil lead wire (7) and does not
adversely affect the diaphragm (8) K. Further, since the lead wire (7) and the diaphragm (8) are
not in direct contact with each other, the lead wire (7) is not broken due to friction (5). Next, how
to attach the insulator (9) to the diaphragm (8) will be described. In the embodiment shown in
FIG. 2, a cylindrical insulator (9) having a hollow portion is fixed to a hole provided with a
diaphragm (8) K, and a lead wire (7) is attached to the cylindrical hollow portion. Through the
Further, FIG. 3 shows another embodiment, and a short conductor (b) having an insulation
coating layer (2) around is inserted into a hole provided in a diaphragm, and the abovementioned hole is surrounded by the above-mentioned. Insulating waves to layers are fixed, and
lead wires (7) are connected to both ends of the conductor by, for example, soldering. In the
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embodiment shown in FIG. 2, the work is easy because the lead wire (7) is only passed through
the hollow portion of the cylindrical insulator, but the friction between the insulator (9) and the
lead wire (7) It is easy to occur.
Further, in the other embodiment of FIG. 8, although some man-hours are required for
workability, there is almost no adverse effect on the lead wire (7). As described above, according
to the present invention, the flexibility of the lead wire of the voice coil is achieved in the
diaphragm (6) of the sandwich structure made of a conductive material that satisfies the specific
elastic modulus and internal loss required for the speaker diaphragm. Since the diaphragm can
be penetrated without loss, a speaker satisfying the performance can be provided.
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