Electricity: conductors and insulators – Anti-inductive structures – Conductor transposition
Reexamination Certificate
2002-05-16
2004-10-19
Mayo, III, William H. (Department: 2831)
Electricity: conductors and insulators
Anti-inductive structures
Conductor transposition
Reexamination Certificate
active
06806417
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a conductive thin film sheet, a shield harness and a method of manufacturing the same.
2. Description of the Related Art
A motor car that is a moving body includes a wire harness arranged to supply power from a power source such a battery to electronic appliances such as various lamps and various motors mounted in the motor car, and feed a control signal to these appliances from a control device. The wire harness is composed of a plurality of electric wires.
For example, a shield wire has been used as the electric wire in order to prevent noise from invading its core from the outside. The shield wire includes a shielding potion of braid having conductivity. This shielding portion prevents noise from invading the core.
In recent years, it has been demanded that the above wire harness is manufactured at a low cost.
A proposal therefor is to wind a conductive film sheet having a thin film conductive layer around the outer periphery of electric wires not including the shielding portion. Such a configuration contributes to implementation of low cost and prevention of noise invasion. Meanwhile, in such a configuration also, in order to take out the noise, the conductive layer must be provided with a grounding wire or terminal.
This can be realized in such a manner that a hole is made in the thin film sheet, the end of the grounding wire is passed through the hole and the grounding wire is fixed to the conductive thin film sheet using a washer, bolt, nut, etc. In this case, the conductive thin film sheet must be made thin so that it can be wound around the outer periphery of the electric wires. The conductive layer must be necessarily thin.
Further, equipment of the grounding wire, which requires the washer, bolt, nut, etc., increases the number of components, thus leading to an increase in cost.
In addition, when the bolt and nut are tightened severely, the conductive layer may be broken so that the grounding wire cannot surely connected to the conductive layer. Inversely, when they are tightened loosely, the grounding wire may be disconnected from the conductive layer so that the grounding wire cannot surely connected to the conductive layer. This make it difficult to dissipate noise which tends to invade the core of the electric wire to the outside.
The above proposal will be explained in more detail referring to the drawings.
A shield harness
101
as shown in
FIG. 18
is configured so that electric wires
103
with no shielding portion are bunched, and a conductive thin film sheet
102
is wound around the outer periphery of the electric wires
103
.
The conductive thin film sheet
102
, as seen from
FIGS. 19 and 20
, is composed of an insulating layer
107
, a conductive layer
104
stacked thereon and a double-faced tape
116
with adhesive faces on both sides. The insulating layer
107
is composed of a first insulating layer
105
superposed on the conductive layer
104
and a second insulating layer
106
superposed on the first insulating layer
105
. A pair of double-faced tapes
116
are pasted on the surface of the conductive layer
104
at both ends
102
a
and
102
b
in the widthwise direction of the conductive thin film sheet
102
.
With the one both-sided tape
116
pasted on the outer periphery of the electric wires
103
, the conductive thin film sheet
116
is sequentially wound around the outer periphery of the electric wires
103
from the one end
102
with the one both-sided tape
116
pasted thereon toward the other end
102
b
with the other both-sided tape
116
pasted thereon. Thereafter, the above other both-sided tape
116
is pasted on the conductive thin film sheet
102
. Thus, the conductive thin film sheet
102
will be wound around the outer periphery of the electric wires
103
. In this configuration, the shield harness
101
realizes implementation of low cost and prevention of noise invasion.
However, the structure of the shield harness
101
as shown in
FIG. 18
has the following defect. Namely, in this structure, since the both-sided tapes
116
are pasted on the conductive layer
104
, when the conductive thin film sheet
102
is wound around the outer periphery of the electric wires
103
, a gap
120
occurs between both ends
102
a
and
102
b
where the conductive thin film sheets overlap each other in the neighborhood of the both-sided tapes
116
.
Therefore, when the shield harness
101
is wired in the motor vehicle, the conductive thin film sheet
102
may develop wrinkles due to the gap
120
. Then, in the neighborhood of the gap
120
and winkles, it is difficult to make sufficient electric shield.
Further, owing to vibration while the vehicle runs, the conductive thin film sheet
102
suffers from repeated flexion in the neighborhood of the gap
120
or wrinkle, the conductive layer
104
may be broken. In such a case, it becomes further difficult to make sufficient electric shield.
SUMMARY OF THE INVENTION
Accordingly, a first object of this invention is to provide a conductive thin film sheet equipped with a conductive which can surely dissipate noise which tends to invade an electric wire when it is wound around the wire, and be manufactured at low cost, and a method of manufacturing the same.
A second object of this invention is to provide a conductive thin film sheet which can surely dissipate noise which tends to invade a wire when it is wound around the wire and be made at low cost.
A third object of this invention is to provide a shield harness using the conductive thin film sheet.
In accordance with the first aspect of this invention, there is provided a conductor-equipped conductive thin film sheet comprising:
a conductive thin film sheet including a conductive layer and an insulating layer stacked on thereon; and
a conductive metallic piece bonded onto the conducive layer.
In this configuration, since the metallic piece is bonded to the conductive layer, an increase in the number of components can be prevented. Further, since the metallic piece is bonded to the conductive layer, when the conductive layer is wound around an electric wire, the noise which tends to invade the electric wire can be dissipated outwardly through the conductive layer and metallic layer.
In a preferred embodiment, the conductive thin film sheet is wound around an outer periphery of a plurality of electric wires; and
the metallic piece is shaped like a belt and extended in a longitudinal direction circumferentially of of the plurality of electric wires when the conductive thin film sheet is wound around the outer periphery of the plurality of electric wires.
By plastically deforming the metallic piece like a ring, the conductive thin film sheet can be easily wound around the outer periphery of the plurality of electric wires. The conductive thin film sheet thus wound is supported by the metallic piece plastically deformed like the ring.
In a preferred embodiment, the metallic pieces are located at both ends of the conductive thin film sheet, respectively which are spaced apart from each other in the longitudinal direction of the plurality of electric wires when the conductive thin film sheet is wound around the outer periphery of the plurality of electric wires.
Therefore, the metallic piece, when previously deformed plastically like a ring, can be easily fixed to the auxiliary machines in such a manner that tubes are passed inside the metallic pieces. Further, by tightening the metallic piece using a metallic band from outside, the metallic pieces can be surely fixed to the tubes.
In a preferred embodiment, the conductive thin film sheet is wound around the outer periphery of the plurality of electric wires in such a fashion that the conductive layer is located outside and the insulating layer is located outside. This prevents the conductive layer from being exposed and prevents the metallic piece or conductive layer from being short-circuited with another electric wire or electric appliance.
In a preferred embodiment, the metallic piece is superposed on the insul
Baba Akira
Ikeda Tomohiro
Murakami Kazuhiro
Saito Satoshi
Watanabe Yoshihiko
Armstrong Kratz Quintos Hanson & Brooks, LLP
Mayo III William H.
Yazaki -Corporation
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