Electrical connectors – Including or for use with coaxial cable
Reexamination Certificate
1999-11-19
2001-03-13
Paumen, Gary F. (Department: 2833)
Electrical connectors
Including or for use with coaxial cable
C439S585000
Reexamination Certificate
active
06200162
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a shielded or shielding terminal to be connected with an end of a shielded cable.
2. Description of the Related Art
A prior art shielding terminal is shown in
FIGS. 6 and 7
. This prior art shielding terminal is comprised of an inner terminal “a” to be connected with a mating terminal and an outer terminal “c” in the form of a rectangular tube that accommodates the inner terminal via a dielectric element “b”. A core fastening portion “h” is provided in the inner terminal “a” and is crimped into connection with the end of a core “e” of a shielded cable “d”. Similarly a braided wire fastening portion “i” and a sheath fastening portion “j” are provided at the outer terminal “a” and are crimped into connection with an end of a braided wire “f” and an end of a sheath “g”, respectively.
When the shielding terminal is crimped by a terminal mounting apparatus, the core “e”, the braided wire “f” and the sheath “g” are connected simultaneously. It is essential, therefore, to form windows “k” in the upper and lower surfaces of the outer terminal “c” so that a crimper can access and crimp the core fastening portion “h” of the inner terminal “a” accommodated in the outer terminal “c”.
This means that a portion of the fastened end of the core “e” has its upper and lower surfaces exposed through the windows “k”, thereby undesirably reducing shielding characteristics, such as a radiation characteristic.
In view of the above problem, an object of the present invention is to provide a shielding terminal having improved shielding characteristics.
SUMMARY OF THE INVENTION
According to the invention, there is provided a shielding terminal that is connectable with an end of a shielded cable. The shielded cable is formed by coaxially arranging a core and a shield layer, such as a braided wire, with an insulating layer therebetween and covering the outer surface of the shield layer by a sheath. The shielding terminal comprises an inner terminal to be crimped into connection with the core and an outer terminal to be connected with the shield layer. The outer terminal is configured for accommodating the inner terminal with a dielectric element provided between the inner and outer terminals. A cover member is provided for substantially covering an exposed portion of the inner terminal near its fastening portion to the core. The cover member preferably is detachably mountable on a fastening portion of the outer terminal to the shield layer. Since the exposed portion of the inner terminal near its fastening portion to the core is covered by the cover member, shielding characteristics, such as a radiation characteristic, can be improved.
According to a preferred embodiment of the invention, the cover member is detachably mountable on a fastening portion of the outer terminal to the shield layer. Accordingly, the shielding terminal can be made smaller and simpler by simplifying the mount construction.
According to a further preferred embodiment, the inner terminal is crimped into connection with the core at a location outside the outer terminal. The shield layer, in particular the braided wire, then preferably is folded back onto the sheath. The outer terminal includes the fastening portion for fastening the folded back portion of the shield layer together with the sheath. A covering wall portion may be provided for substantially covering the fastening portion of the inner terminal to the core on three sides. The cover member is formed to substantially close an opening of the covering wall portion and is detachably mountable on the fastening portion of the outer terminal.
These embodiments have several advantages. For example, the shielding terminal can be made smaller. Additionally, a crimper is allowed to have a simple construction. Furthermore, the fastening portion of the inner terminal to the core can be covered on four sides by the covering wall portion of the outer terminal and by the cover member. Thus, shielding characteristics can be improved more securely.
Preferably, a portion of the cover member mountable on the fastening portion of the outer terminal is formed into a clip for elastically holding the fastening portion. Since the mount portion of the cover member is in the form of a clip, the cover member can be easily and strongly mounted.
Most preferably, the cover comprises a covering portion positioned radially inwardly and longitudinally displaced from a radially outward surface of the outer terminal. Thus the outer terminal comprises an edge portion, which can act as an engaging portion for a locking portion of an external housing.
These and other objects, features and advantages of the present invention will become more apparent upon a reading of the following detailed description and accompanying drawings.
REFERENCES:
patent: 4010538 (1977-03-01), O'Keefe et al.
patent: 4337989 (1982-07-01), Asick et al.
patent: 5145409 (1992-09-01), Sato et al.
patent: 5169340 (1992-12-01), Nakata et al.
patent: 5409400 (1995-04-01), Davis
patent: 5580268 (1996-12-01), Miyazawa
patent: 5667404 (1997-09-01), Kato et al.
patent: 5725395 (1998-03-01), Lee
Aoyama Masahiko
Koide Takashi
Saito Masashi
Casella Anthony J.
Hespos Gerald E.
Nguyen Phuongchi
Paumen Gary F.
Porco Michael J.
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