Electricity: conductors and insulators – Conduits – cables or conductors – Combined
Reexamination Certificate
1999-01-12
2001-05-29
Reichard, Dean A. (Department: 2831)
Electricity: conductors and insulators
Conduits, cables or conductors
Combined
Reexamination Certificate
active
06239373
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to an end structure for a shielding wire and a method of producing the end structure. More particularly, it relates to the end structure for an end portion of braided wire constituting the shielding wire and the method of producing the end portion.
For example, Japanese Unexamined Patent Publication (Kokai) No. 8-78071 discloses a prior art end structure for the shielding wire. According to the disclosed method of producing the end structure, an outside insulating rind of the shielding wire is firstly taken off to expose the braided wire and then, the exposed braided wire is folded back to lie on the outside insulating rind. Thereafter, an inside insulating rind is taken off to expose a core line of the shielding wire.
The inside insulating rind of the shielding wire is fixed to a terminal by inserting the inside insulating rind into a retainer part of the shielding wire and sequentially crimping the retainer part and a connecting part of the terminal, so that the core line of the shielding line is electrically connected to the terminal. Then, the so-fixed terminal is inserted into a cylindrical shielding terminal, so that the braided wire is electrically connected to the shielding terminal at the interior of the shielding terminal.
The electrical connection between the shielding terminal and the braided wire is completed by providing a plate spring folded back in the shielding terminal and sequentially contacting the plate spring with the braided wire electrically. The so-assembled shielding terminal is inserted into a housing while fitting a cap to an opening end of the shielding terminal.
According to the above-mentioned terminal management structure, since there is no need to expose the braided wire longer thereby to abolish various works to twist the braided wire, insert them into a thermal shrinking tube, crimp the shielding terminal to the braided wire for electrical connection, or the like, the workability in managing the terminal can be improved.
In the above-mentioned terminal management structure, however, it is necessary to provide the shielding terminal, therein, with the plate spring for electrical connection between the shielding terminal and the braided wire of the shielding wire, so that the structure of the shielding terminal is complicated to cause the troublesome manufacturing for the shielding terminal.
Additionally, the terminal management structure requires to establish a large spring load of the plate spring in order to avoid an incomplete contact of the plate spring with the braided wire. On the contrary, when over-increasing the spring load of the plate spring, it becomes difficult to insert the braided wire into the plate spring. Further, the large-established spring load for the plate spring would cause the braided wire to be withdrawn from the plate spring for incomplete contact between the plate spring and the braided wire.
The terminal management structure further includes a problem that the braided wire gradually comes loose since a terminal portion of the braided wire remains to be exposed with no treatment.
SUMMARY OF THE INVENTION
It is therefore a first object of the present invention to provide an end structure for a shielding wire and a method of producing the end structure of the shielding wire, by which it is possible to prevent the terminal portion of the braided wire from being loosen. It is a second object of the present invention to provide the end structure and the method of producing the end structure of the shielding wire, by which an end portion of a shielding terminal can be simplified thereby to provide the facilitated and reliable connection between the shielding terminal and the braided wire.
As the first aspect of the invention, the above-mentioned objects can be accomplished by an end structure for a shielding wire including a core part made of conductive material, an inside insulating rind covering the core part, a braided wire arranged about the inside insulating rind and an outside insulating rind arranged about the braided wire to cover the core part, the inside insulating rind and the braided wire, the end structure comprising:
a covering part which is separated from an end of the outside insulating rind so as to cover the circumference of an end portion of the braided wire, the end of the outside insulating rind being positioned so as to recede from an end of the braided wire to the opposite side of a leading end of the shielding wire,
wherein the covering part is welded to the inside insulating rind in the vicinity of the end of the braided wire,
According to the above-mentioned end structure, the covering part is provided apart from the end of the outside insulating rind so as to cover the end portion of the braided wire. Further, the covering part is welded to the inside insulating rind. Thus, the end portion of the braided wire is covered and secured with the covering part. Consequently, it is possible to eliminate a possibility that the braided wire begins to be loosen from the end portion.
Preferably, the end structure further comprises a shielding terminal which is connected with the braided wire between the covering part and the outside insulating rind.
In this structure, the outside insulating rind is cut in the vicinity of the end portion and sequentially shifted toward the end of the braided wire, thereby providing the covering part. Under such a situation, a part of the braided wire is exposed between the covering part and the end of the outside insulating rind. Therefore, according to the second aspect, there is no need to peel the outside insulating rind in order to expose the braided wire. Further, owing to the arrangement where the shielding terminal is connected to the exposed braided wire, it is possible to facilitate the connecting operation between the shielding terminal and the braided wire while preventing the end portion of the braided wire from being loosen.
Preferably, the covering part is welded to the inside insulating rind by means of ultrasonic oscillation.
In this structure, owing to the ultrasonic welding, the end portion of the braided wire can be covered with the covering part certainly, whereby it is possible to prevent the braided wire from being loosen from the end portion. In addition, it is also possible to weld the covering part to the inside insulating rind locally and rapidly.
Preferably, the shielding terminal has an end portion pasted with a welding material having a low melting point and the end portion of the shielding terminal is conductive-connected to a portion of the braided wire between the covering part and the end of the outside insulating rind through the welding material by means of ultrasonic oscillation.
In this case, owing to the welding material's fusing by ultrasonic oscillation, the end portion of the shielding terminal is metallically joined to the braided wire for conductive connection.
Preferably, the end portion of the shielding terminal is conductive-connected to the portion of the braided wire between the covering part and the end of the outside insulating rind at the same time of welding the covering part to the inside insulating rind by means of ultrasonic oscillation.
In this case, it is possible to connect the shielding terminal with the braided wire and also connect the covering part to the inside insulating rind at one ultrasonic oscillation.
Preferably, the covering part is welded to the inside insulating rind at a plurality of regions in the circumferential direction of the shielding wire by means of ultrasonic oscillation.
In this case, it is possible to weld the covering part to the inside insulating rind more firmly.
Preferably, the covering part is welded to the inside insulating rind through a whole area thereof in the circumferential direction of the shielding wire by means of ultrasonic oscillation.
In this case, since the covering part is welded to the inside insulating rind through the whole circumference, the appearance of the covering pan can be improved. Furthermore, sin
Kudo Shigeji
Kuwayama Yasumichi
Sato Kei
Watanabe Shoichi
Yamakawa Nobuaki
Finnegan Henderson Farabow Garrett & Dunner L.L.P.
Nguyen Chau N.
Reichard Dean A.
Yazaki -Corporation
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