JPS6217770Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a connection section of an optical fiber cable using a connector.

Background and purpose of the invention In a connector, the ferrule is normally biased forward by a spring. Therefore, when the connectors are fitted and the ferrules butt against each other, the ferrules move back slightly.

When the ferrule retreats, a bend occurs in the optical fiber core wire, but if the effect of the bend is transmitted to the abutting portion of the ferrule, there is a risk that the ferrule will be misaligned in axis or angle.

The purpose of this invention is to prevent the effects of bending of the optical fiber core occurring inside the connector from being transmitted to the abutting portion of the ferrule.

Embodiment "Fig. 1" is an example of use in a connector plug.

10 is an optical fiber cable, 12 is a tension member, 14 is a core wire, and 16 is a sheath.

18 is a nut, 20 is a rear nut, and 22 is a rubber tube.

24 is a bushing clamp (second and third
), 26 is its front projection, 28 is its rear projection, 3
0 is the brim (the left side is the front, see the arrow in Figure 1).
A hole 32 passes through the center from front to back. In the portion other than the front projection 26, the groove 34 has, for example, 4 grooves.
(same number as the core wires 14) are provided radially.

After guiding each fiber core 14 (or unit) into each groove 34 in advance,
The rear projection 28 is inserted into the end of the sheath 16. The tension member 12 is crimped and gripped within the front projection 26.

36 is the inner insulator (4th, 5th
(Fig.), almost cylindrical. Bottomed holes 38 and 40 in the axial direction are provided on the front and rear surfaces, and the rear portion has a tapered surface 41.

The outer insulator 42 is made of a cylindrical body. This is fitted onto the inner insulator 36.
A gap 44 is formed therebetween. The width C of the gap 44 is set to be slightly larger than the thickness of the core wire 14.

46 is an intermediate sleeve (FIG. 6). Fits onto the outer insulator 42 and attaches the rear nut 2 to it.
0 is screwed.

48 is a separator washer (7th and 8th
(Figure), four grooves 50 (same number as the core wires) are provided in the disc-shaped main body. 52 is a protrusion.

The protrusion 52 is inserted into the hole 38 and attached to the front surface of the inner insulator 36, the outer insulator 42, etc. The core wire 14 passes within each groove 50.

54 is an insert (FIGS. 9 and 10).
Cylindrical holes 5, for example four, penetrating back and forth
6 is provided. The ferrule 58 attached to the tip of each core wire 14 is inserted into each hole 56, and the spring 60
and apply it to the front of the separator washer 48.

62 is a front nut. This is placed over the insert 54 and then screwed into the front end of the intermediate sleeve 46.

64 is a plug body, and 66 is a coupling.

Function When this plug is fitted into the jack, the spring 6
0 may cause the ferrule 58 to move back a little. At that time, if the core wire 14 is the ferrule 5
If the ferrule is bent near 8 (inside the hole 56 of the insert 54), as stated at the beginning, the ferrule 5
A diagonal force is applied to the cable 8, which may cause angular or axial misalignment in the abutting portions of the core wires 14.

However, in this case there is a gap 44 formed between the inner and outer insulators 36, 42 immediately after the insert 54. The width C is only slightly larger than the thickness of the core wire 14, and the gap 44 has a ring shape (FIG. 5). Further, the core wire 14 itself has considerable elasticity. Therefore, when the ferrule 58 is retracted, the core wire 14
6. Go straight back inside the gap 44 and taper surface 4
1 and the outer insulator 42 within the gap 45.

Even if the core wire 14 is bent behind the gap 44, the bend is regulated by the gap 44.
Even if force is applied to the ferrule 58, it is in the axial direction, so there is no risk of causing the angular deviation as described above.

Note that even if the core wire 14 is a little too long when assembling the plug, the same result as described above can be achieved if the extra length is accommodated within the gap 45.

Another embodiment As shown in "Fig. 11", the inner insulator 3
Grooves are provided at opposing locations of the outer surface of the outer insulator 6 and the inner surface of the outer insulator 42, so that a round hole-shaped gap 44' is formed when they are assembled as shown in FIG. 12. The inner diameter of the gap 44' is 1
4, and pass the core wire 14 through each of them.

The effect is almost the same as in the above case, except that the core wire 1
The function of regulating the curvature of 4 becomes stronger.

Effects of the invention The internal insulator 36 is substantially cylindrical and has a tapered surface 41 at the rear, and the cylindrical external insulator 42 is coaxially fitted to the internal insulator 36, and the cylindrical portions of the external insulator 42 and the internal insulator 36 are A gap 44 with a width C slightly larger than the diameter of the core wire 14 is created between the outer insulator 42 and the outer insulator 42, and a large gap 45 is created between the core wire 14 and the tapered surface 41. (1) When the ferrule 58 is retracted, the core wire 14
, as described above, recedes straight through the hole 56 and the gap 44, and curves at the large gap 45.

Therefore, only force in the axial direction is applied to the ferrule 58, and there is no fear of angular deviation or the like.

(2) Insert the rear protrusion 28 of the bushing clamp 24 into the rear part of the cable sheath 16, then the core wire 14 passes through the groove 34, follows the tapered surface 41 of the internal insulator 36, and passes through the gap 44.
, so there is a step between the core wire 14 in the gap 44 and the core wire 14 in the groove 34.

Therefore, when the core wire 14 is retracted, it can be bent easily within the gap 45.

[Brief explanation of the drawing]

Figures 1 to 10 relate to an embodiment of this invention, with Figure 1 being a partially longitudinal elevational view, and Figure 2 being a partially longitudinal elevational view of the bushing clamp 24.
A cross section is shown in FIG. FIG. 4 is a partial longitudinal elevational view of the inner and outer insulators 36, 42, FIG. 5 is a side view, FIG. 6 is a partial longitudinal elevational view of the intermediate sleeve 46, and FIG. 7 is a partial longitudinal elevational view of the separator washer. A vertical elevation view, FIG. 8 is a side view, and FIG. 9 is an insert 54.
Figure 10 is a side view, Figure 11 is a partial vertical elevation view of
12 and 12 are explanatory views of another embodiment in an exploded and assembled state. 10: Optical fiber cable, 14: Fiber core wire, 36: Inner insulator, 42: Outer insulator, 44: Gap, 54: Insert,
58: Ferrule.

Claims (1)

[Claims for Utility Model Registration] It has a front protrusion 26 and a rear protrusion 28, and a collar 30 is provided in the middle thereof, and the same number of grooves 34 as the core wires 14 are provided in a portion other than the front protrusion 26. In front of the bushing clamp 24, there are provided an internal insulator 36 which is approximately cylindrical and has a tapered surface 41 at the rear, and a cylindrical external insulator 42 that is coaxially fitted to the internal insulator 36. A gap 44 with a width C slightly larger than the diameter of the core wire 14 is formed between the cylindrical portion of 36 and the external insulator 42, and a large gap 45 is formed between the tapered surface 41 and the inside and outside In the front of the insulators 36 and 42, an insert 54 is provided which is cylindrical and has the same number of holes 56 penetrating back and forth as the core wire 14, and the rear protrusion 28 is inserted into the rear part of the cable sheath 16 so that the core wire 14 is inserted into the groove. 34, along the tapered surface 41 of the internal insulator 36, through the gap 44, and into the center of the hole 56 of the insert 54. A ferrule 58 is attached to the tip of the ferrule, and the ferrule 58 is inserted forward from the hole 56. A connecting portion of an optical fiber cable, characterized in that the ferrules 58 are urged forward by a spring 60 to prevent the ferrules from escaping, and the ferrules 58 are abutted against each other.