Multi-line signal cable

Details Multi-line signal cable Multi-line signal cable

1999-03-17

2001-05-01

Sircus, Brian (Department: 2839)

Electrical connectors

With vitreous-type envelope

Having bayonet-coupling contact

Reexamination Certificate

active

06224424

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a signal cable, more particularly to a multi-line signal cable for connecting a personal computer, such as a desktop or notebook computer, to a peripheral device, such as a computer monitor, printer, or scanner.
2. Description of the Related Art
FIG. 1
illustrates a conventional multi-line signal cable
1
that is used to connect a personal computer (not shown) and a computer monitor (not shown). The signal cable
1
includes a plurality of coaxial signal lines
13
and a plurality of insulated single-core ground lines
14
bundled inside an inner conductive jacket
12
, and an outer insulating jacket
11
sheathed on the inner conductive jacket
1
.
2
. One end of the signal cable
1
is connected to the computer monitor. The other end of the signal cable
1
is terminated by an electrical connector
2
for electrical connection with the personal computer.
Referring to
FIG. 2
, each of the coaxial signal lines
13
, such as R, G, B video signal lines, includes a conductive core
131
, a dielectric layer
1
.
32
around the conductive core
131
, a metal shielding layer
133
around the dielectric layer
132
, and an insulation layer
134
around the metal shielding layer
133
.
It is noted that, aside from reducing the diameters of the coaxial signal lines
13
and the ground lines
14
, no other scheme is available for reducing the size of the signal cable
1
. However, a reduction in the diameters of the coaxial signal lines
13
and the ground lines
14
will have an adverse effect on the quality of signal transmission.
SUMMARY OF THE INVENTION
Therefore, the object of the present invention is to provide a relatively small and relatively low-cost multi-line signal cable of the aforementioned type that is capable of maintaining good signal transmission quality.
According to the present invention, a multi-line signal cable is adapted to be terminated at one end by an electrical connector having a metal casing, and comprises:
a plurality of signal lines, each including a conductive core, a dielectric layer around the conductive core, and a metal shielding layer around the dielectric layer;
an inner conductive jacket sheathed on the signal lines such that the metal shielding layer of each of the signal lines is in direct electrical contact with the inner conductive jacket, the metal shielding layer of each of the signal lines and the inner conductive jacket being adapted to establish electrical connection with the metal casing of the electrical connector for grounding purposes when the multi-line signal cable is terminated by the electrical connector; and
an outer insulating jacket sheathed on the inner conductive jacket.
Preferably, the metal shielding layer of each signal line is formed as a metal wire wound around the dielectric layer.


REFERENCES:
patent: 2876274 (1959-03-01), Cole et al.
patent: 4974075 (1990-11-01), Nakajima

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