JPS5893018A - Reinforcing member and its production for part connected by fusion bonding of core wire of optical fiber - Google Patents

Abstract

PURPOSE:To facilitate the reinforcing process for connection of the core wire of an optical fiber, by expanding like a taper the both ends of a heat melting tube which is used for reinforcement at the fused and connected part of an optical fiber. CONSTITUTION:The inner diameter of a heat melting tube 1 is increased like a taper at both ends of the tube 1. A paraboloidal expansion is also available for the taper instead of a linear expansion. A core wire 2 of an optical fiber is previously put through the tube 1 and then connected with fusion. Then the tube 1 is shifted onto the connected part with fusion of the tube 1, and the tube 1 is melted by a heating means. Thus the connected part 3 is reinforced. As the inner diameter of the tube 1 is increased at its both ends, the tube 1 can be easily shifted without causing any disconnection although a difference of level exists at the coat eliminating terminal at the side of a core wire 2' of the optical fiber.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a reinforcing member, which is a thermofusible cheapo material for reinforcing an optical fiber core fusion splicing portion, which has been improved to facilitate reinforcing work, and a method for making the same.

Generally, the strength of the fusion spliced portion of an optical fiber core is reduced to about XAo of the core wire due to removal of the coating and thermal distortion during discharge fusion, so it is essential to reinforce the fusion spliced portion. Conventionally,
The method of using heat-fusible tubes as this reinforcing member is often used as it is highly reliable. By the way, when adopting this method, the fibers should be pre-bonded before fusion splicing the optical 7-eye d fibers. It is necessary to pass it through the heat melting tube, and after fusion bonding, move the armpit and -f again to bring it to the fusion splicing part. At ζ0, the fusion splicing part of the optical fiber core wire had a difference in the diameter of the optical fiber and the core wire diameter at the part where the coating was removed, so it was easy to get caught on the end of the heat-fused tube, so it was necessary to be very careful during the work. ), there is a drawback that the optical fiber connection part is easily broken, and the reinforcing member that uses heat-sealed shrinkage foam on the outside of the heat-melted chip, -1, has the drawback that the optical fiber connection part is easily broken. There was a problem that the positional relationship between the heat shrinkable chip and the external heat shrinkable chip was misaligned], and that the heat-fusible chip could be dropped and soiled when handled as a waste material.

The present invention eliminates these drawbacks by providing a heat melting chip, -
Spread out in a tapered shape as the inner diameter of fO reaches the end and fuse it II!
6::1 In the evening, at the same time heat [JI? It is an object of the present invention to provide a reinforcing member for an optical fiber core fusion splicing part and a method for forming the same, in which the reinforcing member uses the heat-induced shrinkage tip, the -pu and the O position to not deviate from each other.

To explain the drawings in detail below, Fig. 1 is a cross-sectional view showing one embodiment of the present invention. 1 is a heat melting tip (hereinafter referred to as ``chip''), and the inner diameter of the tip 1 is spreads out in a chi-shape at both ends. In this example, the spread is straight-lined, but it may also be parabolic.
2 is an optical fiber core wire, and 3 is a fusion splicing portion of the optical fiber.

The connection and reinforcing procedure is as follows: 2t of IK optical fibers are threaded through the tube in advance, and 2 and 2' optical 7 fibers are fusion spliced using a known method (Figure 1 shows this condition). ). Next, the cheap is moved onto the fusion bond AS2 and heated by known heating means.
- Reinforce the optical fiber connection portion 3t by melting the fiber optic fiber 1.

In this embodiment, when moving □l and front 0f--,
Since the inner diameter of the wire is widened at both ends, it is easy to move even if there is a step at the uncoated end on the optical fiber core wire 2' side, and the wire will not be caught and broken.

The iris 2114 is a cross-sectional view showing a 0*0 embodiment of the present invention, and the outer diameter is larger at both ends as well as the inner diameter. The effect is similar to that of the previous embodiment, but as will be described later, it has the advantage that it can be formed from the tube directly above it by simple post-processing.

Dew 3E shows a further embodiment according to the present invention.
This is nine examples in which a heat-melting chip, 1' and a heat-melting chip, 2 are applied to a reinforcing member on the outside thereof. In this case, the diameter of the heat-shrinkable cheep JOp'9 is
t is smaller than the outer diameter of both ends. Then, it is necessary to reinforce the heat-shrinkable chip, -2 and the heat-fused chip, -fl' as a unit).
There is no misalignment between the hot melting tip 2 and the hot melting tip 1'.

Therefore, the reinforcing member 0IIL can be easily handled and the workability when moving the reinforcing member during connection work is improved.

By the way, as a reinforcing method using a heat-shrinkable tube, a structure in which a tensile strength wire or the like is inserted between the heat-shrinkable tube and the heat-molten steel, -f, has been proposed (49 1983-129305).
, Japanese Patent Application No. 56-9386, etc.), but if the present invention is used in this case as well, the tensile strength can be reduced as shown in FIG. 4 as another example.
6 etc. are also held at the same time, so the effect is significant.In this case, it is not necessary that the outer diameter of both ends of the heat-molten tip, -P1'C) be larger than the inner diameter of the heat-shrinkable tip, -P2. .

FIG. 5 shows an embodiment for making a heat-melting chip -11' according to the present invention, and shows an example of the heat-melting chip -11' for the heater 4t-.
(ethylene vinyl acetate))! 1) Hot melting tip 1
When the end of the tip is heated to a softening temperature, the diameter of the end of the tip gradually expands. The expansion of the diameter can be easily adjusted by adjusting the heating temperature, time, etc.
It can be experimentally confirmed that the diameter ratio can be doubled in a few seconds. This method is simple and has the advantage of being able to produce a large number of materials in a short period of time. For longer EVA or longer heat station cables, add longer GV cables and tensile strength wires.
01 When cutting into long lengths for reinforcing members, heat the cutting blade 9 or install a heater tube near the cutting blade. It is also useful to improve manufacturability.

No. 61E1 is a sectional view of another embodiment in which a jig is used to create the heat melting chip of the present invention.

5 is a jig, and the tip 9 has a conical shape.

In other words, the heat 51 of the resin (commonly known as nylon)
gm chip - If you simply heat the heated part O
Since the number of chips 11 is reduced, a jig 5 is provided between the heater 4 and the heat melting chip 11. This O jig 5 is heated to the softening point temperature of the heat melt tube 1 by the heater 4.Next, when the end of the heat melt tube 1' is pushed in from the tip of the heat melt tube 1', -lP) According to the conical shape of the oil odor J'0, the inside of the end O of the hot melting cheep 1' can be expanded into a shape Δ. Thereafter, by stopping the heating of the heater 4 and lowering the temperature of the jig 5 to below the softening point, the heat-melting chips 1-1' are hardened, thereby producing the heat-melting chips of the present invention. The example is the angle f of the apex of the cone
By changing t-, there is an advantage that the shape of the end of the heat-melting tube can be arbitrarily taken. Note that workability will be improved if the surface of the jig 5 is subjected to a treatment such as tetrafluoroethylene treatment that makes it easier to separate the heat-melted chip 1 from the jig 5.

Such a production method is simple and requires only heating, and has the advantage that it does not require particularly large-scale equipment.

As described above, by widening both ends of the heat melting tube 10 used for reinforcing the optical fiber fusion splicing portion in a tenon shape, the splicing and reinforcing work can be facilitated and the workability can be improved. In addition, in a reinforcing member that uses heat-shrinkable chips in combination, the reinforcing members have a structure in which the auxiliary materials are held together, which has the advantage of being extremely easy to handle.

Furthermore, it will be easier to apply a cushioning material to the edges of the ζQi chips, where the inner diameter of the thermal melting chip O increases, to improve adhesion and prevent dirt from being carried in. benefits arise.

Figure 1 is a cross-sectional view showing one embodiment of the reinforcing member according to the present invention, Figures 2 to 4 are cross-sectional views showing other different embodiments of the reinforcing member according to the present invention, K68 is the original @ FIG. 6 is a diagram showing an embodiment of the method for producing an O-reinforcing member; FIG.

1.1'-thermal melting, -f,! -Hikari 7 T, Shinko 11,
J - optical fiber fusion splice, 4 - heater, 5 - treatment, d - tensile strength wire.

Applicant's agent: Takehiko Benkeshi 11118! ! 1 1I2 figure 1 σ=222222)

Claims (1)

[Claims] (1) Part of the coating of optical 7 fiber core wire is removed and fusion bonded.
In the reinforcing member made of a heat-fused chip for reinforcing a nine-optical fiber core SIS splicing part for performing a,
A reinforcing member for a light 7-tay Δ-core wire-bonded pseudo-bond s, characterized in that the inner diameter of the wire is widened in a 3-degree shape at both ends. (2) Make sure that the outer diameters of both ends of the heat-melting tip are approximately the same or larger than the heat-shrinkable tip 41 provided on the cough fever S melting tip, the heat shrinking tip provided on the outer edge of the heat-melting tip, and the inner diameter of the heat-shrinking tip provided on the outside of the heat-melting tip. Reinforcing member for the optical fiber core wire-to-junction portion described in Claim 8, Section 1 (3) Part of the coating of the optical fiber core wire is removed and the amount of bonding is performed. In the method for creating a reinforcing member consisting of a heat-fused chi, -1 for reinforcing an optical fiber fusion joint, both ends of the heat-fused chi, -fO are heated directly or by inserting them into a conical jigs. 1. A method for making an optical fiber fusion splicing reinforcing member, which comprises widening both ends of the cheep into a tapered shape. (4) The heating of the heat-melted dates is carried out during the cutting process of the heat-melted dates -1.
A method for producing an optical fiber fusion splicing reinforcing member described in .