Shielding connector

Details Shielding connector Shielding connector

1999-07-13

2001-08-07

Paumen, Gary F. (Department: 2833)

Electrical connectors

With vitreous-type envelope

Having bayonet-coupling contact

C439S098000

Reexamination Certificate

active

06270377

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a shielding connector which is improved in the terminal treatment of a shielding wire thereof.
2. Description of the Related Art
Conventionally, as a shielding connector, there is known a shielding connector which is disclosed in Japanese Patent Publication No. 6-260246 of Heisei. The thus disclosed shielding connector, as shown in
FIG. 18
, includes a cylindrical-shaped shielding shell c in such a manner as to cover a terminal storage chamber b within a housing a. In the terminal storage chamber b, there can be stored a flat type terminal g which is pressure contacted with a core wire e of a shielding wire d; and, a shell connecting portion i formed in a shell connecting terminal h connected to a braided wire f of the shielding wire d is contacted with the shielding shell c, whereby the core wire e can be shielded both inside and outside the housing a.
In the shell connecting portion i of the shell connecting terminal h, as shown in
FIG. 19
, there are disposed a plurality of elastic contact pieces j; and, the open end portions k of the elastic contact pieces j are so formed as to spread wide, so that the elastic contact pieces j can be elastically deformed.
However, because the shell connecting portion i is limited in size, even if the contact pressure is not sufficient, the size of the elastic contact piece j, which is disposed in the shell connecting portion i, cannot be increased over its size limitation, that is, the elastic force of the elastic contact piece J cannot be increased up to a sufficient level.
Also, before the shielding wire d is connected to the shielding connector, the transportation or the like of the shielding wire d is executed in its wound condition. However, there is a fear that, when winding the shielding wire d, the surface of the shielding wire d can be damaged by the open end portions k which are projected externally of the shell connecting portion h.
Further, depending on the shape of the housing a, the shielding shell c may be formed in a prismatic shape. In this case, in order to keep good contact with the prismatic-shaped shielding shelter c, the shell connecting portion i must also be formed in an angular shape.
However, the flat type terminal g is limited in the insertion direction with respect to the terminal storage chamber b, that is, the flat type terminal g has an insertion direction limit with respect to the terminal storage chamber b, and also the shell connecting portion i of the shell connecting terminal h has an insertion direction limit with respect to the prismatic-shaped shielding shell c. Therefore, when connecting the two terminals g and h to the shielding wire d, the connection positions of the two terminals g and h must be matched to each other with accuracy, in particular, after one terminal is connected to the shielding wire d, the other terminal must be connected to the shielding wire d in such a manner that the connection position of the other terminal must be matched accurately to the connection position of the previously connected terminal, namely, one terminal in the peripheral direction thereof. This makes it troublesome to connect the other terminal that is to be mounted later, resulting in the poor efficiency of the terminal connection operation.
Further, conventionally, as a structure for connecting the braided wire of a shielding wire to the shielding shell of a shielding connector, there is known a structure for caulking a connecting terminal to the end portion of the shielding wire. This type of structure is disclosed in Japanese Patent Publication No. 8-45575 of Heisei; and, in particular, as shown in
FIG. 20
, a shielding wire
101
is structured such that the periphery of a core wire
102
is covered by an insulating coating
103
, the outer periphery of the insulating coating
103
is covered by a braided wire
104
formed by braiding together metal fine wires, and the outer periphery of the braided wire
104
is further covered by an outer coating
105
. In the end portion of the shielding wire
101
, the outer surface thereof is peeled off starting from the leading end thereof in such a manner that the core wire
102
, insulating coating
103
, braided wire
104
and outer coating
105
are sequentially exposed in this order; in particular, a receiving tube portion
106
is inserted into between and held by the insulating coating
103
and braided wire
104
, and a connecting terminal
107
is caulked from the outer periphery of the braided portion
104
covering the outer periphery of the receiving tube portion
106
.
The connecting terminal
107
is structured such that the inner peripheral surface
108
thereof is contacted with the braided wire
104
, while the outer peripheral surface
109
thereof is fitted and contacted with the inner periphery of a shielding shell disposed within a connector housing (not shown). Due to this, the braided wire
104
and shielding shell can be connected in conduction to each other through the connecting terminal
107
.
By the way, to establish an ideal contact condition between the connecting terminal
107
and braided wire
104
, the inner peripheral surface
108
of the connecting terminal
107
may be closely contacted with the braided wire
104
. Therefore, it can be imagined that a caulking force used to caulk the connecting terminal
107
is increased to a sufficient degree to thereby caulk the connecting terminal
107
while crushing the same. In this case, the outside diameter of the connecting terminal
107
is caused to vary in a decreasing manner by caulking. However, because the then varying amount of the outside diameter of the connecting terminal
107
cannot be set constant, there is a possibility that the contact state between the outer peripheral surface
109
of the connecting terminal
107
and the inner periphery of the shielding shell can be unstable.
On the other hand, in order to set up an ideal contact state between the shielding shell and connecting terminal
107
, if the connecting terminal
107
is caulked such that the outside diameter of the connecting terminal
107
can be constant according to the inside diameter of the shielding shell, then it is difficult to caulk the connecting terminal
107
with a sufficient caulking force. Due to this, there is a possibility that the contact state between the braided wire
104
and the inner peripheral surface
108
of the connecting terminal
107
can be unstable. That is, in the above-cited conventional structure, the above-mentioned two kinds of contact states cannot be made ideal at the same time.
SUMMARY OF THE INVENTION
The present invention aims at eliminating the above-mentioned drawbacks found in the conventional shielding connector. Accordingly, it is an object of the invention to provide a shielding connector capable of simplifying an operation to connect a shell connecting terminal or a flat type terminal to a shielding wire which is to be connected to a prismatic-shaped shielding shell, and to provide a structure which is capable of establishing ideal contact states between the connecting terminal and braided wire as well as between the connecting terminal and shielding shell.
In attaining the above object, according to a first aspect of the invention, there is provided a shielding connector of a type structured such that, a shielding shell is disposed within a housing, a shielding wire includes a core wire connected to a terminal metal member and a braided wire connected to a shell connecting terminal, and a shell connecting portion formed in the shell connecting terminal is connected to the shield shell, wherein the shell connecting portion is formed in an annular shape and, on the inner periphery of the shielding shell, there is disposed an elastic tongue piece which can be contacted with the shell connecting portion.
In the conventional structure where the elastic contact piece is disposed on the shell connecting portion side, due to the size restriction of the shell connecting portion, ther

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