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DESCRIPTION JPS63172598

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DESCRIPTION JPS63172598
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
flat wire voice coil for a speaker used in a sound reproduction device or the like. 2. Related Art
Conventionally, a flat wire voice coil of this type of speaker has a structure as shown in FIG. That
is, the first layer portion G is wound on the cylindrical bobbin 4 and the second layer portion is
further wound on the first layer portion C so that the long side direction -sf overlaps the
rectangular wire whose cross section of the wire 6 is rectangular. It is a flat wire voice coil of a
rotated configuration. If the problem to be solved by the invention is the former configuration of
the flat wire voice coil, the longitudinal direction 6f of the cross-sectional shape of the first layer
C and the second layer is perpendicular to the axis of the cylindrical bobbin As a result, the
bonding strength between the wire rings is weak, and for example, there is a possibility that the
bonding may break during operation in FIG. 2E. Furthermore, the thickness y of the wire ring of
the voice coil is larger than in the case where the conventional cross-sectional shape is a round
wire, and the magnetic gap formed by the magnetic circuit becomes larger. / M '), B-1 (wb / m)
which is the product of the effective length A' (m) of the voice coil ring in the magnetic gap is not
different from that of the conventional round wire. While trying to use a flat wire to open the
sound pressure to the coil, there is a possibility that the merit of using a flat wire will be lost. The
present invention is intended to provide a flat wire speaker that can solve the above problems. In
order to solve this problem, in order to solve this problem, the present invention winds the first
layer on a cylindrical bobbin so that the rectangular wire cross section of the wire crosses the
long side direction, The second layer is wound at a predetermined angle ? with respect to the
first layer winding portion. Since the second layer portion is wound at an appropriate angle ?
with respect to the first layer winding portion of the two-layer wound flat wire voice coil, the
adhesive strength between the wire rings is the same as that of the conventional two-layer
wound flat wire voice The sound pressure can be improved because the coil can be improved and
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1
the thickness of the wire ring of the voice coil is reduced. EXAMPLE A flat wire voice coil
according to an example of the present invention will be described below. As shown in FIG. 1, the
first layer portion a is wound on the cylindrical bobbin 1 so that the wire rod 3 has a rectangular
wire whose cross section is rectangular and the long side direction 3f of the wire 3 is heavy when
wound. . The second layer portion is wound on the first layer portion a (C wound at an
appropriate angle ? with respect to the first layer portion a. Since the second layer has an
appropriate angle ? of, for example, 16 ░ to 46 ░ with respect to the first layer &, the
reliability of the adhesive strength between the wire rings (2 parts m part) can be improved, and
the voice coil wire The thickness X of the ring can be reduced.
Effect of the Invention As described above, according to the present invention, the second layer
portion is wound at an appropriate angle ? with respect to the first layer portion of the twolayer flat wire voice coil, thereby bonding the wires. An improvement in strength can be achieved
with respect to a conventional two-layer wound flat wire voice coil. Furthermore, since the
thickness of the voice coil wire ring can be made smaller than that of the conventional two-layer
flat wire wire coil, it is possible to reduce the length of the magnetic gap formed by the magnetic
circuit and improve the sound pressure.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is an enlarged sectional view of an essential part of a two-layer flat wire voice coil
according to an embodiment of the present invention, and FIG. 2 is an enlarged sectional view of
an essential part of a conventional two-layer rectangular wire voice coil.
1 ииииии Cylindrical bobbin, 2, 3 ииииииии Flat wire Figure 1! Figure 2 No. 1 No. NN, 3G ? 3Z = 5aE
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