Electricity: conductors and insulators – Anti-inductive structures – Conductor transposition
Reexamination Certificate
2001-04-10
2002-09-03
Nguyen, Chau N. (Department: 2831)
Electricity: conductors and insulators
Anti-inductive structures
Conductor transposition
C174S1130AS, C174S1170FF
Reexamination Certificate
active
06444902
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of The Invention
The present invention relates to an electrical cable, and particularly to an electrical cable which provides an improved shielding means.
2. Description of Prior Art
With the development of computer technology, a new product, named as a serial ATA electrical connector, is developed for use as an interface of fast-talking drives, which will effectively double the bandwidth, or capacity for data, between disk drives—-ranging from hard drives to CD-rewritable drives—-and other PC components. Referring to
FIG. 3
, such a serial ATA cable
3
for signal transmission comprises twin axial or parallel pair cable subassemblies
32
. Each cable subassembly
32
includes a pair of insulated signal conductors
34
and a pair of non-insulated grounding drain wires
36
besides the two signal conductors
34
, all of which are arranged side by side as shown, and all of the signal conductors
34
and drain wires
36
fall on a common plane
30
. A layer of conductive shielding
38
is wrapped around the pair of signal conductors
34
and drain wires
36
so that it is in electrical contact with the drain wires
36
. An optional jacket
39
is covered over the pair of shieldings
38
. The shielding
38
prevents emissions from the cable
3
as well as provides isolation from nearby or stray signals, and the planar structure of the cable provides advantages in routing and other cable management tasks for certain applications. However, the pair of cable subassemblies
32
are isolated from each other by a portion of the jacket
39
, and the number of the drain wires
36
adapted for grounding are comparatively too many, thereby resulting in an increase in the whole width of the electrical cable
3
and complicating the manufacturing process of the cable
3
as well.
Hence, an improved shielded cable is required to overcome the disadvantages of the prior art.
BRIEF SUMMARY OF THE INVENTION
A main object of the present invention is to provide an electrical cable having relative reduced whole width and low cost while providing an effective grounding function.
An electrical cable for signal transmission comprises a pair of signal transmission groups, a single non-insulated first drain wire sandwiched between adjacent inner sides of the signal transmission groups and a pair of non-insulated second drain wires disposed at opposite outer sides of the transmission groups. Each signal transmission group has a pair of insulated signal conductors and a layer (
15
) of shielding, made of aluminum foil or the like, surrounding on the insulated signal conductors. Both the first and second drain wires are electrical contacted with associated outside surfaces of the layers of shielding for providing a grounding circuit. All of the signal conductors and the first and second drain wires are arranged side by side and their axes fall on a common plane. An optional jacket is wrapped on the signal transmission groups and the first and second non-insulated drain wires.
Other objects, advantages and novel features of the invention will more apparent from the following detailed description of the present embodiment when taken in conjunction with the accompanying drawings.
REFERENCES:
patent: 4234759 (1980-11-01), Harlow
patent: 5208426 (1993-05-01), Kennedy et al.
patent: 5416268 (1995-05-01), Ellis
patent: 5872334 (1999-02-01), Trazyik
Quach Frank
Tsao Pei
Chung Wei Te
Nguyen Chau N.
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