Cable for conducting simultaneously electricity and light

Details Cable for conducting simultaneously electricity and light Cable for conducting simultaneously electricity and light

1990-06-18

1992-09-08

Lee, John D.

Optical waveguides

Optical transmission cable

With electrical conductor in the same cable

385100, G02B 644

Patent

active

051465280

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The invention concerns a cable with at least one core and at least one layer of insulation
Electric cable is employed is almost every field of technology. Antenna signals for example are forwarded to receivers, television or radio receivers for example, by way of coaxial cable. Telephone communications are no longer conceivable without coaxial cable. In this area in particular, however, coaxial cable is being increasingly replaced with optical cable, which features an essentially more extensive band width and lower attenuation, because light is a form of energy that requires no shielding, and because the crosstalk that is so irritating with coaxial cable does not occur at all with optical.
Many types of equipment, television sets and video recorders for example, are designed only for coaxial cable. The video signal is transmitted from the recorder to the television set over a coaxial cable. To operate a combination television set and video recorder, however, it is of advantage to transmit control signals in addition to video and audio signals between the two units. Due to the narrow band width and especially due to the distortions occasioned in the video signal and the extreme difficulty of separating the video signal from the audio signal inside the equipment it is not advisable to transmit control signals over the coaxial cable along with the video signals. One of skill in the art is accordingly compelled to provide a separate line to transmit the control signals, which is undesirably expensive. The separate components in other types of consumer electronics-- high-fidelity sets with record players, compact-disk players, radio receivers, audio-cassette recorders, and amplifiers for example-- are connected by simple cable. When control signals must be transmitted along with music and speech, a separate line is also necessary for the aforesaid reasons.


SUMMARY OF THE INVENTION

The object of the present invention is accordingly to provide a means of transmitting information between two pieces of equipment connected by a cable without a separate line and without detriment to the transmission over the cable of either the information or the energy.
This object is attained in accordance with the invention, a cable with at least one core and at least one layer of insulation, in that the layer of insulation is made of optically conductive material and transmits the information optically.


BRIEF DESCRIPTION OF THE DRAWINGS

The invention will now be described with reference to the drawings, wherein
FIG. 1 is a transverse section through a singlecore cable in accordance with the invention,
FIG. 2 is a longitudinal section through a cable in accordance with the invention with a connector at one end,
FIG. 3 is a longitudinal section through a cable in accordance with the invention with a connector at one end, and
FIG. 4 illustrates an information-transmission system comprising a video recorder, a television set, and a cable in accordance with the invention.


DESCRIPTION OF THE PREFERRED EMBODIMENTS

FIG. 1 is a transverse section through a single-core cable K in accordance with the invention. Its core A is made of wire and extends through a cylindrical, optically conductive layer I of insulation.
FIG. 2 is a longitudinal section through the cable K illustrated in transverse section in FIG. 1. One end is secured in a connector in the form of a plug VS. The outside of plug VS terminates in a tubular sleeve H that extends partly over cable K Extending along the axis of sleeve H is a pin S that is electrically connected to the core A of cable K. Between pin S and sleeve H is a tubular coupling L with a cross-section that preferably matches the cross-section of the layer I of insulation around cable K. Layer I of insulation can rest against optical coupling L but need not do so, because any space between the two components, although it might attenuate the optical connection, could not interrupt it.
The light, indicated by the arrows, travels from layer I of insulation into optical coupling

REFERENCES:
patent: 3399012 (1968-08-01), Peters
patent: 4547774 (1985-10-01), Gould
patent: 4681398 (1987-07-01), Bailey et al.
patent: 4768860 (1988-09-01), Tatsukami et al.
patent: 4919505 (1990-04-01), Bartosiak et al.
patent: 4969706 (1990-11-01), Hardin et al.

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