Electrical connectors – With circuit conductors and safety grounding provision – Grounding to conductive sheath of cable
Reexamination Certificate
1998-10-21
2001-02-13
Sircus, Brian (Department: 2839)
Electrical connectors
With circuit conductors and safety grounding provision
Grounding to conductive sheath of cable
C439S095000
Reexamination Certificate
active
06186802
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a shielded connector for connecting a braided covering of a shielded wire to a metallic case of an apparatus so that the braided covering can be grounded. More particularly, the present invention relates to a shielded connector, the structure of which is simple so that the assembling work can be simplified and further the shielding property and the reliability of connection can be enhanced.
2. Description of the Related Art
In order to shut off electric noises such as electromagnetic waves and static electricity, there is provided a shielded electric wire to be used as a high-tension electric wire composed in such a manner that a core covered with and insulated by an inner covering is further covered with a braided covering, and furthermore the braided covering is covered with a sheath for insulation.
In order to connect the braided covering of the shielded wire to a metallic case of an apparatus so that the braided covering can be grounded, a special shielded connector has been conventionally used.
First of all, a shielded connector of a first conventional example, which is disclosed in Japanese Utility Model Unexamined Publication No. Hei. 6-58560, will be described below.
FIG. 5
is a cross-sectional view showing a shielded connector of the first conventional example.
In
FIG. 5
, reference numeral
1
is a shielded electric wire, which includes a core
1
A, an inner covering
1
B for covering and insulating the core
1
A, a braided covering
1
C for covering the outside of the inner covering
1
B, and a sheath
1
D for covering and insulating the braided covering
1
C.
At an end portion of the shielded electric wire
1
, the inner covering
1
B and the sheath
1
D are peeled off stepwise, so that the core
1
A and the braided covering
1
C are exposed.
The end portion of the shielded electric wire
1
composed as described above is attached to a metallic case
2
of an apparatus (not shown) via a shielded connector
100
.
An outline of the structure of the shielded connector
100
is described as follows. A connector housing
104
is made of synthetic resin, and a cylindrical metallic shell
101
is insert-molded to the connector housing
104
. Further, a terminal metal fitting
105
, a connecting member
103
and a rubber plug
102
are accommodated in the connector housing
104
.
On an outer circumference of the connector housing
104
, there are provided flanges
104
a,
104
a
which are formed integrally with the connector housing
104
. In each flange
104
a
, there is provided a bolt hole for directly attaching the connector housing
104
to the metallic case
2
.
In the metallic shell
101
, there are provided contact pieces
101
a
,
101
a
corresponding to the flanges
104
a
,
104
a
. When the connector housing
104
is directly attached to the metallic case
2
, these contact pieces
101
a
,
101
a
are electrically connected to the metallic case
2
.
The core
1
A of the shielded electric wire
1
is connected to one side of the terminal metal fitting
105
, and an electric wire of the apparatus is connected to the other side of the terminal metal fitting
105
.
The terminal metal fitting
105
described above is fixed to the connector housing
104
by a stop ring
107
.
The connecting member
103
is formed into a ring-shape which coincides with a profile of the rubber plug
102
. The connecting member
103
is press-fitted into the braided covering
1
C, so that the braided covering
1
C can be connected to the metallic shell
101
.
The rubber plug
102
is provided for ensuring the water-tightness in the connector housing
104
. The rubber plug
102
is fixed to the connector housing
104
by a rubber plug holder
106
.
In the shielded connector
100
composed as described above, when the connector housing
104
is directly attached to the metallic case
2
, the metallic shell
101
can be connected to the metallic case
2
via the contact pieces
101
a
,
101
a.
Due to the foregoing, the braided covering
1
C of the shielded electric wire
1
connected to the metallic shell
101
via the connecting member
103
is grounded to the metallic case
2
.
Next, a shielded connector of a second conventional example will be described below which is disclosed in Japanese Patent Unexamined Publication No. Hei. 8-96868.
FIG. 6
is a cross-sectional view showing a shielded connector of the second conventional example.
In
FIG. 6
, an outline of the structure of a shielded connector
200
is described as follows. A rubber plug
202
, a connector housing
203
made of synthetic resin and a spring piece
204
are successively inserted into a cylindrical metallic shield cap
201
which corresponds to the metallic shell
101
described above. A metallic shield ring
205
is attached to a braided covering
1
C of a shielded electric wire
1
.
In the shield cap
201
, there is provided a flange
201
a
. The shield cap
201
is directly attached to a metallic case
2
of an apparatus (not shown) by fixing the flange
201
a
with bolts.
In the shielded connector
200
described above, when the shield ring
205
attached to the braided covering
1
C of the shielded electric wire
1
is connected to the shield cap
201
via the spring piece
204
, the braided covering
1
C is grounded to the metallic case
2
of the apparatus.
However, the following problems may be encountered in the conventional shielded connectors
100
and
200
described above. The number of parts of the shielded connector of each conventional example is large, and further the structure is complicated. Therefore, it takes much time to assemble the conventional shielded connector. Furthermore, the shielding property of the conventional shielded connector is deteriorated.
In the shielded connector
200
of the second conventional example, the shield cap
201
and the connector housing
203
made of synthetic resin are formed separately from each other . Therefore, the number of parts is increased and further the number of steps required for assembling the shielded connector is increased.
On the other hand, in the shielded connector
100
of the first conventional example, the metallic shell
101
is insert-molded to the connector housing
104
made of synthetic resin. However, according to the above structure, the connector housing
104
and the metallic shell
101
must be press-formed separately from each other. As a result, the number of parts is increased and further the number of steps required for manufacturing the shielded connector is increased.
In the shielded connector
100
of the first conventional example, it is difficult to press-fit the shielded electric wire
1
into the connecting member
103
so that the braided covering
1
C of the shielded electric wire
1
is not twisted. On the other hand, in the shielded connector
200
of the second conventional example, it is difficult to insert the shielded electric wire
1
into the shield ring
204
so that the braided covering
1
C of the shielded electric wire
1
is not twisted. In both of the first and second conventional examples, skilled technique is required for assembling work of the shielded connector.
Further, in the shielded connector
100
of the first example and the shielded connector
200
of the second example, the structure is so complicated that it is impossible to assemble the shielded connector in such a manner that the shielded electric wire
1
is simply inserted into the parts composing the shielded connector and pushed into the connector housing
104
or
203
.
In addition to that, when the connecting member
103
or the shield ring
205
is assembled to the braided covering
1
C of the shielded electric wire
1
, there is a possibility that the braided covering
1
C is twisted. In this case, the contact becomes defective, and the shielding property is deteriorated.
SUMMARY OF THE INVENTION
The present invention has been made to solve the above problems. It is an object of the present invention to provide a shielded connector, the structure
Masuda Satoki
Shirouzu Kouichi
Prasad Chandrika
Sircus Brian
Sughrue Mion Zinn Macpeak & Seas, PLLC
Yazaki -Corporation
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