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US 8,948,556 B2Granted
Optical-electrical composite cable
AssigneeHitachi Metals, Ltd.
InventorsJuhyun Yu, Osamu Seya, Yoshinori Sunaga, Kouki Hirano, Hiroki Yasuda, Yoshikazu Namekawa, Takanobu Watanabe
Life of this patent
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Abstract
An optical-electrical composite cable includes an optical fiber, a tubular resin inner cover to enclose the optical fiber, a plurality of electric wires disposed on an outside of the inner cover, and a tubular outer cover to collectively cover the plurality of electric wires. The plurality of electric wires are helically wound around an outer peripheral surface of the inner cover so as to be situated between the inner cover and the outer cover.
Claims8
An optical-electrical composite cable, comprising:
- an optical fiber;
- a tubular inner cover comprising resin to enclose the optical fiber;
- a plurality of electric wires disposed on an outside of the inner cover;
- and
- a tubular outer cover to collectively cover the plurality of electric wires, wherein the plurality of electric wires are helically wound around an outer peripheral surface of the inner cover so as to be situated between the inner cover and the outer cover to cover a periphery of the inner cover,
- wherein an elastic modulus of the inner cover is not less than 0.3 GPa and not more than 4.0 GPa,
- wherein a helical winding pitch of the plurality of electric wires is not less than 5 mm and not more than 150 mm,
- wherein load applied to the inner cover by an external force from an outer periphery side of the outer cover is reduced by a contact between adjacent electric wires of the plurality of electric wires and sliding of the plurality of electric wires with respect to the inner cover, and
- wherein a void space is formed between the optical fiber and the inner cover and the void space is not less than 35% of a whole area within the inner cover.
6 more elements
Dependencies are inferred from the claim text.