Optical waveguides – Optical transmission cable – Tightly confined
Utility Patent
1999-02-22
2001-01-02
Font, Frank G. (Department: 2877)
Optical waveguides
Optical transmission cable
Tightly confined
C385S102000, C385S107000
Utility Patent
active
06169835
ABSTRACT:
BACKGROUND OF THE INVENTION
The invention relates to an optical fiber cable with lateral light diffusion, comprising at least one strand consisting of a first layer of elementary fibers around which other layers of elementary fibers may be twisted.
Such a cable is used for decorative lighting, with which luminous lines which can follow curved paths can be drawn.
The document U.S. Pat. No. 5,416,875 (John S. Keplinger et al.) describes a cable which comprises several strands, referred to as “single cables”. Each strand comprises a plurality of individual fibers, for example, four rectilinear central fibers which constitute a central core around which other fibers are twisted in a continuous manner. The strands are twisted themselves.
SUMMARY OF THE INVENTION
It is an object of the invention to simplify the implementation of the cable by improving its characteristics.
To this end, the elementary fibers of the first layer of a strand are twisted themselves, and this first layer comprises a number of elementary fibers such that there is no central elementary fiber in the strand.
Strands of two, three or four fibers do not have a central fiber, which is advantageous because a central fiber would not be twisted and would thus emit little lateral light and, moreover, even if it emitted a surplus of light, this light would be absorbed by the fibers surrounding it.
When a strand comprises a first layer of fibers covered by a second layer of fibers and when the fibers constituting the first layer are twisted in a given ratio between the helical pitch and the diameter of the layer, the fibers constituting the second layer are twisted in a ratio between the helical pitch and the diameter of the second layer that is different from the above-mentioned given ratio, such that the radius of curvature due to the twisting is substantially the same for all fibers.
REFERENCES:
patent: 4331379 (1982-05-01), Oestreich et al.
patent: 4676590 (1987-06-01), Priaroggia
patent: 5333228 (1994-07-01), Kingstone
patent: 5416875 (1995-05-01), Keplinger et al.
patent: 5715879 (1998-02-01), Grahma et al.
patent: 5978536 (1999-11-01), Brandi et al.
patent: WO9000699 (1990-01-01), None
Faller F. Brice
Font Frank G.
Nguyen Sang H.
U.S. Philips Corporation
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