JP2005037936A5

JP2005037936A5 -

Info

Publication number: JP2005037936A5
Application number: JP2004191199A
Authority: JP
Filing date: 2004-06-29
Publication date: 2005-09-29

Claims

One or a plurality of optical fiber ribbons are disposed on the inner side of the spacer in which a substantially spiral groove is formed on the outer peripheral surface of a substantially cylindrical plastic long body having a tensile body at the center. A fiber optic cable housed in layers,
In the optical fiber ribbon, a plurality of optical fibers are arranged in parallel, and the total length of the optical fibers is integrated with resin, and the maximum thickness of the optical fiber ribbon is T ( μm), where T ≦ d + 40 (μm), where d (μm) is the outer diameter of the optical fiber,
The resin of the optical fiber ribbon is formed with a recess corresponding to a recess between the adjacent optical fibers,
The parallel pitch of the optical fibers included in the optical fiber ribbon is P (μm), and a natural number including 0 which is 1/2 or less of the number of the optical fibers included in the optical fiber ribbon is m. Sometimes, a plurality of the optical fiber ribbons are stacked with a deviation of mP + P / 2 (μm) in the width direction of the optical fiber ribbon with respect to the adjacent optical fiber ribbons. Features an optical fiber cable.

The optical fiber cable according to claim 1,
The optical fiber tape core is formed by arranging a plurality of optical fibers in parallel and covering and integrating the total length of the plurality of optical fibers and the entire circumference of the optical fibers with a resin. An optical fiber cable, wherein T ≦ d + 40 (μm), where T (μm) is the maximum value of the thickness of the wire and d (μm) is the outer diameter of the optical fiber.

The optical fiber cable according to claim 1 or 2,
The optical fiber cable, wherein m is 0.

The optical fiber cable according to any one of claims 1 to 3,
An optical fiber cable, wherein a plurality of the optical fiber ribbons are stacked alternately and sequentially shifted in the width direction with respect to the adjacent optical fiber ribbons.

The optical fiber cable according to any one of claims 1 to 4,
The optical fiber cable is characterized in that (T−d) /2Y≦4.0 when the depth of the concave portion is Y (μm).

The optical fiber cable according to any one of claims 1 to 5,
The optical fiber cable is characterized in that the optical fiber ribbon is T ≦ d + 30 (μm).

The optical fiber cable according to any one of claims 1 to 6,
The optical fiber cable is characterized in that g ≦ d when the thickness of the optical fiber ribbon in the recess is g (μm).

The optical fiber cable according to claim 7,
An optical fiber cable, wherein the optical fiber ribbon is g ≦ 0.8d.

The optical fiber cable according to any one of claims 1 to 8,
The optical fiber cable, wherein the adjacent optical fibers are arranged in contact with each other.

The optical fiber cable according to any one of claims 1 to 8,
In the optical fiber ribbon, at least two adjacent optical fibers are not in contact with each other, and are arranged with an interval of 10 (μm) or less. Fiber cable.

The optical fiber cable according to any one of claims 1 to 10,
The groove is formed in a spiral shape in one direction along the longitudinal direction of the spacer.

The optical fiber cable according to any one of claims 1 to 10,
The optical fiber cable is characterized in that the groove is formed in a spiral shape that is alternately inverted along the longitudinal direction of the spacer.

An optical fiber cable according to claim 12,
Inside the groove, a plurality of the optical fiber ribbons are sequentially and alternately shifted in the width direction by half the parallel pitch of the optical fibers with respect to the adjacent optical fiber ribbons. And
The resin of the optical fiber ribbon is formed with a recess corresponding to a recess between the adjacent optical fibers,
The optical fiber cable, wherein the groove has a size that encloses a circumscribed circle of a laminated core of optical fiber tapes formed of the laminated optical fiber ribbons in a sectional view.

An optical fiber cable according to claim 13,
In the cross section of the groove, the bottom of the groove has an arc shape, and the radius of the arc is not less than the radius of the circumscribed circle.