JP2677885B2 - Connector ferrule - Google Patents

Description

TECHNICAL FIELD The present invention relates to a connector ferrule used for an optical connector.

(Prior Art) For example, as shown in FIG. 5, a connector ferrule has an optical fiber core wire 1 in which a coating 1a on the tip side is removed and an optical fiber 1b is exposed, and the optical fiber core wire 1 is inserted into a ferrule 2 and an adhesive Is used for an optical connector that optically connects single-core optical fibers such as D type and FC type based on a predetermined standard. Here, the ferrule 2 has, as shown in FIG. 6, at the center of the main body 2b on which the collar portion 2a is formed,
A hole for inserting the optical fiber core wire 1 is formed from the base end face 2c to the front end face.
The optical fiber core wire 1 is formed so as to penetrate 2d.
The size of each hole is determined based on a predetermined standard so as to correspond to the above shape. That is, the inner diameter of the large-diameter hole 2e, which is opened in the base end face 2c and into which the covering portion of the optical fiber core wire 1 is inserted, is 1 m.
m, the inner diameter of the guide hole 2f that is formed concentrically with the large-diameter hole 2e and guides the optical fiber core wire 1 to be inserted is 0.5 mm, and is concentric with the guide hole 2f and opens in the tip surface 2d, The inner diameter of the insertion hole 2g to be inserted is 0.125 mm.

(Problems to be Solved by the Invention) By the way, in recent years, with the increase in density of optical fibers, 5
A tape core wire made of a multi-core fiber such as a core or an 8-core fiber has come to be used. For example, a 4-core tape core wire 3 shown in FIG. 7 is manufactured by coating an optical fiber having a diameter of 0.125 mm. There is one in which four optical fiber core wires 4 having a diameter of 0.25 mm are formed in a tape shape by a covering material 5. The tape core wire 3 can separate the optical fiber core wire 4 into individual core wires and can be inserted into the ferrule 2 described above. As described above, the ferrule 2 has an inner diameter of the large diameter hole 2e of 1 mm. Therefore, when the tape core wire 3 having a diameter smaller than that of the large diameter hole 2e is attached to the ferrule 2, the tape core wire 3 is large in the large diameter hole 2e because the clearance between the tape core wire 3 and the inner surface of the large diameter hole 2e is large. There is a problem in handling the connector ferrule, such as eccentricity and insufficient strength due to the tape core wire 3 having a small diameter.

The present invention has been made in view of the above points, even if the optical fiber core wire inserted into the ferrule has a small diameter, the position of the optical fiber core wire is inserted into an appropriate position without eccentricity, and, An object of the present invention is to provide a connector ferrule in which an optical fiber core wire has sufficient strength.

(Means for Solving the Problems) According to the present invention in order to achieve the above object, in a connector ferrule in which the tip of an optical fiber core wire is inserted into a ferrule, the optical fiber core wire has one end inside the ferrule. The other end is extended to the outside of the ferrule to mount a flexible pipe, and at least a part between the pipe and the optical fiber core wire is filled with resin in the ferrule.

(Operation) The diameter of the optical fiber core wire increases due to the mounted flexible pipe and the filled resin, and the optical fiber core wire is inserted into the proper position of the ferrule without eccentricity. Moreover, the optical fiber core wire is reinforced by the flexible pipe and the resin, and the strength is increased.

(Example) Hereinafter, an example in which the present invention is applied to a connector ferrule for an FC type optical connector will be described in detail with reference to FIGS. 1 to 4. In the drawings, the same members as those of the conventional one are designated by the same reference numerals, and detailed description thereof will be omitted.

As shown in FIG. 1, the connector ferrule 10 has a flexible pipe (hereinafter, simply referred to as “pipe”) 12 attached to an optical fiber core wire 11 inserted into the ferrule 2, and the optical fiber core wire 11 and the optical fiber. A resin 13 is filled between the optical fiber core wire 11 and the optical fiber core wire 11, and the tip end side of the optical fiber core wire 11 is inserted and attached to the ferrule 2.

The optical fiber core wire 11 is a core wire having an outer diameter smaller than that of a single-core optical fiber core and having a diameter of 0.25 mm. The coating 11a on the tip side is removed to expose an optical fiber 11b having a diameter of 0.125 mm. In the optical fiber core wire 11, the optical fiber 11b is inserted into the guide hole 2f and the insertion hole 2g on the tip side of the ferrule 2, and
The portions covered with the coating 11a are arranged in the large diameter holes 2e, respectively.

The pipe 12 is made of a flexible synthetic resin such as nylon, polyester, or Teflon, and as shown in FIGS. 2 and 3, on the tip side of the coated portion of the optical fiber core wire 11,
A resin 13 such as epoxy or silicone is filled between the coating 11a and the optical fiber core wire 11 and mounted. Then, the optical fiber core wire 11 is inserted into the ferrule 2 from the base end face 2c side by disposing the mounted pipe 12 in the large diameter hole 2e. In this way, the optical fiber core wire 11 is fitted to the center of the ferrule 2 without eccentricity because the pipe 12 is adhered to the outer circumference. Moreover, the optical fiber core wire 11
Even if the coating 11a is thin, it is reinforced by the pipe 12 and is given sufficient strength.

In addition, the resin 13 is, as shown in FIG.
It may be filled over the entire length between the coating 11a of 11 and the pipe 12.

(Effect of the invention) As is apparent from the above description, according to the present invention, in the connector ferrule in which the tip of the optical fiber core wire is inserted into the ferrule, in the optical fiber core wire, one end in the ferrule. , The other end is extended to the outside of the ferrule and a flexible pipe is attached, and at least a part of the inside of the ferrule between the pipe and the optical fiber core is filled with resin, so that the optical fiber core The diameter of the ferrule increases, and the ferrule can be attached to the center position of the ferrule without eccentricity. Further, since the optical fiber core wire is reinforced by the pipe and is given sufficient strength, it can be used by inserting it into the ferrule without worrying about the strength even if it has a small diameter.

[Brief description of the drawings]

1 to 4 show an embodiment of the present invention. FIG. 1 is a sectional front view of a connector ferrule, FIG. 2 is a sectional front view of an optical fiber core wire with a pipe attached, and FIG. In the figure
III-III sectional view, FIG. 4 is a sectional front view of a connector ferrule showing another modification, FIG. 5 is a sectional front view of a conventional connector ferrule, and FIG. 6 is a sectional front view showing the ferrule of FIG. FIG. 7 is a perspective view of the tape core wire. 2 …… Ferrule, 10 …… Connector ferrule, 11 ……
Optical fiber core wire, 11a …… Coating, 11b …… Optical fiber, 12
...... Flexible pipe, 13 …… Resin

Claims (1)

(57) [Claims] 1. A connector ferrule in which the tip of an optical fiber core wire is inserted into a ferrule, and the optical fiber core wire is made flexible by extending one end into the ferrule and the other end outside the ferrule. While installing the pipe,
A connector ferrule wherein at least a part between the pipe and the optical fiber core wire is filled with resin in the ferrule.