Electricity: conductors and insulators – Conduits – cables or conductors – Combined
Reexamination Certificate
1998-08-27
2001-04-17
Kincaid, Kristine (Department: 2831)
Electricity: conductors and insulators
Conduits, cables or conductors
Combined
Reexamination Certificate
active
06218619
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a connecting structure and a processing method for a shielded wire in which a shield terminal is connected to braid at an end portion of the shielded wire.
2. Description of Relevant Art
FIGS. 1A
,
1
B show a conventional processing method of a shielded wire end disclosed in Japanese Patent Application Laid-Open Publication No. 7-201383. Under this structure, an end portion of a shielded wire
1
is separated to core
2
and braid
3
and a terminal metal (a terminal metal to be connected to an end of the braid
3
is referred to as “shield terminal”)
4
is crimped to each of ends of the core
2
and braid
3
. Before the terminal metal is crimped to the shield terminal
4
, the end portion of the braid
3
is bound by a heat shrinkage tube
5
.
However, in the connecting structure described in the aforementioned patent application, in addition to a procedure for peeling the core cover covering the core
2
so as to expose the core
2
, a procedure for peeling a long portion of a insulating outer cover
6
covering the braid
3
to expose the braid
3
, a procedure for twisting the braid
3
to fit the heat shrinkage tube
5
to the exposed braid
3
, and a procedure for passing the twisted braid
3
through the heat shrinkage tube
5
are needed, so that it takes a long time for this connection work. Further, because it is so constructed that the braid
3
does not cover the core cover in a long range, the shielding performance drops.
Therefore, Japanese Patent Application Laid-Open Publication No. 8-78071 has disclosed a structure which enables the braid
7
connect to to the shield terminal
8
easily. Under this structure, as shown in
FIGS. 2
,
3
, the covering of the shielded wire
9
is peeled before connection. After the braid
7
is exposed by peeling the insulating outer cover
10
, the braid
7
is folded back toward the insulating outer cover
10
so that it overlaps. After that, an insulating inner cover
11
is peeled so as to expose a core
12
.
This processed shielded wire
9
is fixed to a terminal
13
via the insulating inner cover
11
by inserting the insulating inner cover
11
into a holding portion
13
a
of the terminal
13
and then crimping the holding portion
13
a.
Further by crimping a connecting portion of the terminal
13
, the core
12
is connected to the terminal
13
. Then, with this condition, the terminal
13
, is inserted into the cylindrical shield terminal
8
and the braid
7
is connected inside the shield terminal
8
.
The connection between the shield terminal
8
and braid
7
is carried out by making leaf springs
14
,
14
which are folded inside the shield terminal
8
as shown in
FIG. 3
, into contact with the braid
7
so as to ensure conductivity. In
FIGS. 2
,
3
, reference numeral
15
denotes a housing in which the shield terminal
8
and terminal
13
are inserted, and reference numeral
16
denotes a cap to be fit to an opening end
8
a
of the shield terminal
8
.
Under this connecting structure, it is not necessary to expose the braid
7
in a long range and the procedures for twisting the braid
7
, inserting the braid
7
into the heat shrinkage tube, and crimping the shield terminal
8
to the braid
7
are eliminated. Therefore, its work efficiency for the connection has been improved as compared to the connecting structure described first.
However, in this connecting structure, the procedure for exposing the braid
7
by peeling the insulating outer cover
10
of the shielded wire
9
is necessary. This peeling procedure is troublesome and time-consuming.
Further, it is necessary to provide leaf springs
14
inside the shield terminal
8
specially designed for the shielded wire
9
and further the housing
15
for accommodating the shield terminal
8
must be specially designed for the shielded wire
9
and the cap
16
. As a result, the entire structure becomes complicated and a large number of parts are required, so that production cost is high.
Further, to avoid a poor contact between the leaf spring
14
and braid
7
, a spring load of the leaf spring
14
needs to be set large. However, if the spring load is set larger than required, it becomes difficult to insert the braid
7
in between the leaf springs
14
. Further, if the spring load is large, the braid
7
is drawn by the leaf springs
14
so that a poor contact between the leaf springs
14
and braid
7
may occur.
SUMMARY OF THE INVENTION
The present invention has been achieved with such points in view.
It therefore is an object of the present invention to provide a connecting structure for a shielded wire having a simple structure, which does not require a troublesome peeling procedure and is capable of achieving a quick connecting processing and a processing method therefor.
To achieve the above object, according to a first aspect of the invention, there is provided a connecting structure for a shielded wire, comprising a core made of conductor, a core cover for covering the core, a braid provided around the core cover for shielding and an insulating outer cover provided around the braid for covering the core, core cover and braid, for connecting a shield terminal to the braid. The shield terminal in the present invention includes a lead wire attached at one end to a terminal metal and conductively connected at the braid at a portion between the attached and the unattached end. An ultrasonic vibration is applied in a condition that an end of the shield terminal is placed on the insulating outer cover and a resin chip is placed on an end of the shield terminal, so as to melt and disperse the insulating outer cover thereby bringing the end of the shield terminal and braid conductively in contact with each other.
According to this connecting structure of the shielded wire, an end of the shield terminal is placed on the insulating outer cover in a condition that the insulating outer cover at an end portion is not peeled or the braid is not exposed, and the resin chip is placed on the end of the shield terminal. By applying ultrasonic vibration to the resin chip, at least the insulating outer cover of resin is melted and dispersed, so that a shielded conductive portion in which the braid and the end of the shield terminal are conductively in contact with each other is formed.
In this connecting structure, the procedure for peeling the insulating outer cover so as to expose the braid is not necessary. Instead, by placing an end of the shield terminal on the insulating outer cover, placing the resin chip on the end of the shield terminal and applying ultrasonic vibration, the braid and shield terminal can be connected to each other easily. That is, the connecting processing can be carried out quickly.
Further, the housing, cap and the like for accommodating the shield terminal are not necessary, so that a simple connecting structure is ensured.
According to a second aspect of the present invention, there is provided a connecting structure for a shielded wire wherein an end of the lead wire is connected to an end of the terminal metal by applying an ultrasonic vibration in a condition that the end of the lead wire is placed on the insulating outer cover and the resin chip is placed on the portion of the terminal metal on which the lead wire is placed.
According to this connecting structure for the shielded wire, the unattached end of the lead wire is placed on the insulating outer cover of the shielded wire in a condition that the insulating outer cover of the lead wire at the end portion is not peeled or the braid is not exposed, and then the resin chip is placed on the unattached end. If ultrasonic vibration is applied to the resin chip in this condition, at least the insulating outer cover of resin of the shielded wire is melted and dispersed. If the lead wire is a covered wire, the covered portion of this lead wire is also melted and dispersed. As a result, the braid is conductively in contact with the unattached end of the lead wire and the braid is conductively in
Asakura Nobuyuki
Ide Tetsuro
Kuwayama Yasumichi
Finnegan Henderson Farabow Garrett & Dunner L.L.P.
Kincaid Kristine
Nguyen Chau N.
Yazaki -Corporation
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