Bobbin for winding optical fiber and optical fiber

Patent metadata

Field	Value
Publication number	US-9745166-B2
Application number	US-201615049757-A
Country	US
Kind code	B2
Filing date	Feb 22, 2016
Priority date	Aug 30, 2013
Publication date	Aug 29, 2017
Grant date	Aug 29, 2017

Abstract

A bobbin for winding an optical fiber includes a main winding drum having a cylindrical shape, an auxiliary flange portion that is provided on at least one of a first end and a second end of the main winding drum in an axis direction of the main winding drum, a first main flange portion that has a larger diameter than the external diameter of the auxiliary flange portion and that is provided on the main winding drum to face the auxiliary flange portion, a second main flange portion that is provided on the main winding drum to face the first main flange portion, and an auxiliary winding drum that is provided between the first main flange portion and the auxiliary flange portion.

First claim

What is claimed is:

1. A bobbin for winding an optical fiber, comprising:
a main winding drum comprising a cylindrical shape;
an auxiliary flange portion that is provided on at least one of a first end and a second end of the main winding drum in an axis direction of the main winding drum;
a first main flange portion that has a larger diameter than an external diameter of the auxiliary flange portion and that is provided on the main winding drum to face the auxiliary flange portion;
a second main flange portion that is provided on the main winding drum to face the first main flange portion; and
an auxiliary winding drum that is provided between the first main flange portion and the auxiliary flange portion,
wherein a cutout portion that is recessed in a direction orthogonal to a central axis of the bobbin is formed at an outer peripheral edge of at least one of the first main flange portion and the second main flange portion,
wherein a maximum depth from the outer peripheral edge of the cutout portion is a depth that does not reach an outer peripheral surface of the main winding drum, and
wherein a groove portion, which communicates with the cutout portion and extends obliquely from the cutout portion along a tangential direction of the outer peripheral surface of the main winding drum toward the outer peripheral surface of the main winding drum, is formed in at least an inner surface and an outer surface of at least one of the first main flange portion and the second main flange portion.

2. The bobbin for winding an optical fiber according to claim 1 ,
wherein a bottom surface in the cutout portion, as viewed from a section orthogonal to the central axis of the bobbin, is a curved surface that is convexly curved in a radial direction of at least one of the first main flange portion and the second main flange portion and a direction away from a center, and
wherein the groove portion opens to an end portion of the cutout portion.

3. The bobbin for winding an optical fiber according to claim 2 ,
wherein the curvature radius of the curve of the bottom surface of the cutout portion in the section orthogonal to the central axis of the bobbin is equal to or larger than the minimum bending radius of an optical fiber wound around the bobbin.

4. The bobbin for winding an optical fiber according to claim 3 ,
wherein a portion between the end portion of the cutout portion and the groove portion is formed so as to be smoothly and continuously curved.

5. The bobbin for winding an optical fiber according to claim 4 ,
wherein the curvature radius of the portion that is continuous with the end portion of the cutout portion from the groove portion is equal to or larger than the minimum bending radius of an optical fiber wound around the bobbin.

6. The bobbin for winding an optical fiber according to claim 2 ,
wherein the curvature radius of the curve of the bottom surface of the cutout portion in the section orthogonal to the central axis of the bobbin is equal to or smaller than the curvature radius of a circumference of a circle, a central axis of which is a central axial line of the bobbin and which passes through the center of the bottom surface.

7. The bobbin for winding an optical fiber according to claim 6 ,
wherein a portion between the end portion of the cutout portion and the groove portion is formed so as to be smoothly and continuously curved.

8. The bobbin for winding an optical fiber according to claim 7 ,
wherein the curvature radius of the portion that is continuous with the end portion of the cutout portion from the groove portion is equal to or larger than the minimum bending radius of an optical fiber wound around the bobbin.

9. The bobbin for winding an optical fiber according to claim 2 ,
wherein a portion between the end portion of the cutout portion and the groove portion is formed so as to be smoothly and continuously curved.

10. The bobbin for winding an optical fiber according to claim 9 ,
wherein the curvature radius of the portion that is continuous with the end portion of the cutout portion from the groove portion is equal to or larger than the minimum bending radius of an optical fiber wound around the bobbin.

11. The bobbin for winding an optical fiber according to claim 2 ,
wherein the portion that is continuous with the end portion of the cutout portion from the groove portion is formed so that a groove width is enlarged in a trumpet shape toward the end portion of the cutout portion from the groove portion.

12. The bobbin for winding an optical fiber according to claim 2 ,
wherein a depth of the cutout portion is determined so that the bottom surface of the cutout portion is located closer to an outer periphery than the maximum winding diameter position of the optical fiber to be wound around the main winding drum.

13. The bobbin for winding an optical fiber according to claim 2 ,
wherein the groove portions are respectively formed in both surfaces of the inner surface and the outer surface of at least one of the first main flange portion and the second main flange portion, and
wherein the groove portion on the outer surface side of at least one of the first main flange portion and the second main flange portion is formed so as to extend obliquely from the cutout portion along a tangential direction of an outer peripheral surface of the auxiliary winding drum toward the outer peripheral surface of the auxiliary winding drum.

14. The bobbin for winding an optical fiber according to claim 1 ,
wherein a depth of the cutout portion is determined so that the bottom surface of the cutout portion is located closer to an outer periphery than the maximum winding diameter position of the optical fiber to be wound around the main winding drum.

15. The bobbin for winding an optical fiber according to claim 1 ,
wherein the groove portions are respectively formed in both surfaces of the inner surface and the outer surface of at least one of the first main flange portion and the second main flange portion, and
wherein the groove portion on the outer surface side of at least one of the first main flange portion and the second main flange portion is formed so as to extend obliquely from the cutout portion along a tangential direction of an outer peripheral surface of the auxiliary winding drum toward the outer peripheral surface of the auxiliary winding drum.

16. An optical fiber wound around the bobbin for winding an optical fiber according to claim 1 ,
wherein the optical fiber is guided to the outer peripheral surface of the main winding drum via the groove portion, the cutout portion, the auxiliary winding drum, and the main winding drum, and is wound around the outer peripheral surface without including a crossover wire.

17. An optical fiber wound around the bobbin for winding an optical fiber according to claim 2 ,
wherein the optical fiber is guided to the outer peripheral surface of the main winding drum via the groove portion, the cutout portion, the auxiliary winding drum, and the main winding drum, and is wound around the outer peripheral surface without including a crossover wire.

Assignees

• Fujikura Ltd

Inventors

• Shirako Yukinari
• Vasudevan Balasubramaniam
• Tanaka Kohei
• Saito Kazunari

Classifications

• B65H75/28

  Arrangements for positively securing ends of material · CPC title

• B65H75/14

  with two end flanges · CPC title

• B65H2701/32

  Optical fibres or optical cables · CPC title

• B65H75/285

  Holding devices to prevent the wound material from unwinding · CPC title

• B65H75/146 Primary

  with at least one intermediate flange between the two end flanges · CPC title