JPS5936210A - Optical connector plug - Google Patents

Abstract

PURPOSE:To enable the easy mounting of optical fibers without damaging the fibers, by providing a ferrule whic is fitted to the forward end of a holding sleeve and holds a strand held by a guide sleeve and projecting from the sleeve on the optical axis. CONSTITUTION:This plug is designed to be mounted to an optical fiber cable 1 of which a core 1b is projected by removing the covering 1c in the forward end part and a strand 1a is projected stepwise by removing the primary covering of the core 1b. The plug is constituted by having a fixing sleeve 10 to be fixed by pressure to the cable 1, a guide sleeve 20 for holding the strand 1a projecting from the sleeve 10 in an axial direction, a holding sleeve 30 fitted onto the sleeve 10 to hold the sleeve 20, a ferrule 40 fitted to the forward end of the sleeve 30 to align the sleeve 20 to the optical axis and a detaining part 50.

Description

[Detailed description of the invention] Shukan 8J4 is attached to the end of an optical fiber cable,
The present invention relates to an optical connector plug that connects an optical fiber cable to a connector by attaching it to a socket or adapter as it is or by housing it in a housing and attaching it to a socket or adapter.

Conventionally, there is a connector plug of this type as shown in FIG. This conventional plug is constructed by providing a nozzle 3 at the center of the bottom of a ferrule 2 having a cylindrical shape with a bottom, by drilling a hole with high precision.

This conventional plug has a configuration in which the fiber wire 1a from which the coating [C] has been removed is inserted into a nozzle 3 that has been precisely machined to match the fiber diameter. The insertion into 3 may not be Kaiyi, but it may be Shi,
When inserted, the fiber tip and cladding are likely to be damaged, resulting in poor yield. Furthermore, since the optical fiber is fixed by filling the ferrule 2 with an adhesive 4, this method complicates the assembly process and requires time for assembly.

The present invention has been made in view of these points, and has a simple structure, can be manufactured at low cost, can be easily attached without damaging minute optical fibers, and can be used to transmit light without using adhesive. To provide an optical connector plug which can securely fix a fiber and can be easily and quickly attached to an optical fiber cable.

That is, the present invention provides an optical connector plug to be attached to an optical fiber cable in which the coating at the distal end is removed so that the strands and core wires protrude in a stepped manner, and the plug is attached to the proximal end of the optical fiber cable. A fixing sleeve comprising a coating fixing part for inserting and crimping the coating part, and a fiber fixing part for inserting and crimping the core wire protruding from the optical fiber on the distal end side, and protruding from the distal end side of the fixing sleeve. a guide sleeve that holds the wire in the axial direction by pushing through the wire, a fitting portion that fits the fixing sleeve on the proximal end, and a fitting portion that holds the guide sleeve on the distal end. A holding sleeve provided with a guide sleeve holding portion, and a ferrule that fits onto the tip of the holding sleeve and holds the strands that protrude from the sleeve while being held by the guide sleeve on the optical axis. Ru.

Hereinafter, the present invention will be explained based on embodiments shown in the drawings.

Figure 2 is a sectional view showing one embodiment of the optical connector plug of the present invention. In the figure, the plug of the present invention has a coating 1 on the tip end.
The dazzling fiber cable 1 is attached to an optical fiber cable 1 in which the core wire 1b is removed by removing c and the primary coating of the core wire 1b is removed to make the strands 1a protrude in steps. a fixing sleeve 10 that is crimped to the fixing sleeve 10, a guide sleeve 20 that axially holds the element a1a protruding from the fixing sleeve, a holding sleeve 30 that fits into the fixing sleeve 10 and holds the guide sleeve 20, and a holding sleeve 30 that fits into the fixing sleeve 10 and holds the guide sleeve 20; It includes a ferrule 40 that fits onto the tip of the sleeve 30 to align the guide sleeve 20 with the optical axis, and a locking member 50.

The fixing sleeve 10 is made of metal such as brass and is formed into a tube (cylindrical in this embodiment) shape, and as shown in FIG. 3 and FIG. A covering fixing portion 11 to be crimped is provided on the proximal end side, and
It is constructed by providing a fiber fixing part 15 on the distal end side of the optical fiber cable 1 through which the core wire 1b protruding from the distal end is inserted and crimped.

The covering fixing portion 11 is formed with an inner diameter corresponding to the outer diameter of the covering 1C of the optical fiber cable 1 to be fixed, and a screw 13 is cut into the inner wall. This screw 13 bites into the coating 1c during crimping to prevent slippage. However, not only screws but also protrusions may be provided, and may be omitted if slippage is not a problem. In this embodiment, a split 12 is provided on the battlement wall of the covering fixing part 11, and the optical fiber cable 1 is inserted and crimped in the tea ceremony.

The fiber fixing part J5 is formed with an inner diameter that is approximately equal to the outer diameter of the core wire 1b to be fixed (-, and the outer diameter is the outer diameter of the covering fixing part 11 for fitting the collar 18, which will be described later). Set it smaller.

The fixing sleeve 1o is provided with collars 17 and 18 as accessories used when crimping the optical fiber cable 1.

The iy roller 17 is made of metal such as stainless steel, and is press-fitted into the W machine fixing part 11, and then the fixing part 1 is tightened and crimped onto the cover I1c of the optical fiber cable 1 inserted. Although the collar 17 is formed into a cylindrical shape in this embodiment, it may be formed into a C-shape, or may be fastened with a band-like member. Furthermore, the attachment of the collar 17 is not limited to press-fitting.
7 may be formed of a shape memory alloy and fitted using the shape memory alloy.

The collar 18 is made of metal such as stainless steel, and is fitted over the fiber fixing part 15 to compress and deform the fixing part 15, and is crimped onto the core wire 1b inserted therethrough. This collar 18 is formed into a cylindrical shape with an inner diameter slightly smaller than the outer diameter of the fiber fixing portion. However, this collar 18 is not limited to a cylindrical shape, but may be C-shaped, or may be fastened with a band-like shape. As with the above-mentioned collar 17, a method other than press-fitting may be used.

Note that the holding sleeve 16 may be interposed between the fiber fixing portion 15 and the core 1151b and the fibers may be crimped. 1st
An example of this is shown in Figure 0. This protection sleeve 16 is made of an elastic material, for example, synthetic resin, and protects the fine wires 1a within the core wire lb from being distorted during crimping.

As shown in Figure 6, the guide sleeve 20 is made of a metal Nll pipe made of brass or the like, and its outer diameter is the same as that of the holding sleeve 3 described later.
0 and the ferrule 40, and the inner diameter is provided with a diameter that allows the wire 1a to be inserted therethrough. By inserting the strands 1a protruding from the tip of the fixing sleeve 10,
Holds in the axial direction and prevents breakage.

The holding sleeve 30 is made of metal such as brass and is formed into a tube (cylindrical in this embodiment) with a large diameter on the proximal end and a small diameter on the distal end, into which the fixing sleeve 10 is fitted, as shown in Figure 7. A fitting part 31 for attaching the guide sleeve 20 is provided on the proximal end side, and a holding part 34 for holding the guide sleeve 20 in the axial direction is provided on the distal end side.

The fitting part 31 is formed with an inner diameter substantially equal to the outer diameter of the fixing sleeve 10, and press-fits the distal end side of the fixing sleeve 10. Thereby, it is also possible to have a structure in which the fixing sleeve IO and the coating IC of the optical fiber cable 1 are crimped together, and in this case, the collar 17 may be omitted. The fitting portion 31 functions as a holding portion for the entire plug when the plug is used by being attached to a housing.

Therefore, its external shape and diameter are set to correspond to the housing. A holding portion 34 is integrally protruded from the distal end side of the fitting portion 31, and a step portion 32 forms a boundary portion between the holding portions 34 and 34. On the other hand, on the proximal end side of the fitting part 31, there is a 7-lunge 33.
is the provision. This flange 33 functions as a locking portion when the plug is attached to the housing. Therefore,
In the case of a plug that is not attached to a housing, it is not necessary to provide it.

The holding portion 34 is provided with an inner diameter that allows the guide sleeve to be inserted thereinto, and a stepped portion 35 is provided at the tip thereof to view a ferrule 40, which will be described later. The outer diameter of this holding part 34 is
A socket into which a plug should be inserted.

It is set in accordance with the inner diameter of the insertion hole of the adapter gloss.

rlt, the outer diameter of the holding part 34 may be the same diameter as the fitting part 31.

As shown in FIG. 8, the ferrule 40 has a slit 1 made of metal such as stainless steel, and has a fitting part 41 on the proximal end that fits into the stepped part 35, and holds the upper white piguide sleeve 20. The guide sleeve 20 is fitted with a holding part 42 on the distal end side, and is fitted onto the stepped part 35 of the holding sleeve 30, and presses the distal end side of the guide sleeve 20 slightly to bring it into close contact with the cable wire 1a held inside thereof. .

A trigram, as a ferrule, the above! It is also possible to use a device in which the function of a retaining sleeve is previously provided integrally.

An example is shown in FIG. 13 and FIG. 14. The ferrule 80 shown in these figures includes a fitting part 81 that is lower to the fixing sleeve 10, and a holding part 8 that holds the guide sleeve 20.
4 and a flange 83, as shown in Fig. 13, a nozzle portion 85 is provided at the tip;
The monoke shown in FIG. 14 has a stepped portion 87 at its tip and a collar 88 that is press-fitted into the stepped portion 87.

When using this ferrule 80, the holding sleeve 30 described above is not necessary.

The locking member 50 is composed of a washer 51 and an elastic body 52 as shown in FIG. 9, and is used to lock the plug when the plug is installed in the housing, as described above. Therefore, it is not necessary when using the plug alone. The elastic body 52 is made of, for example, a ring-shaped silicone rubber, and absorbs the displacement of the plug within the nozzle. Thereby, the tip of the plug can be reliably brought into contact with another opposing plug or the like.

Next, attachment of the optical connector plug of the present invention to an optical fiber cable will be explained with reference to the above figures. In addition,
In this example, an optical fiber cable is constructed by applying a primary coating with an outer diameter of about 1 ram to a multi-component glass fiber wire with a diameter of about 250 μmm, and then providing a sheath i with an outer diameter of about 3 nm. Although the description will be given assuming that the cable is used, it goes without saying that the applicable cable is not limited to this.

When installing the plug, do not untwist it, but insert the coating at the tip of the optical fiber cable l into the holding sleeve 30 with the ferrule 40.
The core wire 1b is made to protrude by removing about the fitted length, and the base of the protruding portion of the core wire 1b is attached to the fiber fixing portion 1.
The primary coating was removed leaving it slightly longer than the length of 5, and the element 1i11a was protruded from the cell. The tip of this optical fiber cable 1 is inserted into the fixing sleeve 10, and the collar 17 is press-fitted into the covering fixing part 11 from the tip side until it touches the flange 14, and the fixing part 11 to be treated is tightened to be crimped to the covered i1c. . Next, the collar 18 is press-fitted into the fiber fixing part 15 in order to compress and deform the fiber fixing part 15 inward, compressing the primary coating of the core wire 1b, and crimping the fiber fixing part 15 to the core wire 1b. .

As a result, the fixing sleeve 10 is fixed to the optical fiber cable 1.

Next, the washer 5] and the elastic body 52 are fitted into the fixed sleeve 1o, and the fitting part 31 is fitted into the holding sleeve 3o while inserting the protruding wire 1a into the holding part 34. Install. Next, the protruding 11ys lg lil
While inserting the guide sleeve 2° into the holding portion 34 of the holding sleeve 3o.

Then, while inserting the guide sleeve 20 into the holding part 42, the fitting part 41 of the ferrule 4o is fitted into the stepped part 35 of the holding sleeve 30. Furthermore, the ferrule 40
The strands 1a protruding from the tips of the wires are polished and removed.

In this way, the plug is attached to the optical fiber cable 1. In this case, one optical fiber cable, ri',
1. Since the Pi1c and the U core a1b are crimped at the attachment point 17-1o, even if stress is applied in the length direction, both the sheathing 1c and the core wire 1b will be pulled out and protrusion will occur. It is firmly fixed without any problems. The strand 1a is held and protected by the Gaitos 1 knob 20 and is held in the holding station 1.
Because it is held in the knob 30 and inserted into the ferrule 40, it is not easy to damage the fine needle.In addition, the ferrule 40 that is attached to the socket, adapter, etc. In addition to holding the ferrule 40, the ferrule 40 is press-fitted so that the fiber optic 20 and the wire 1a come into close contact with each other, so that the deviation of the optical axes can be kept small.

However, if high centering accuracy is not required,
It is not necessary to squeeze the guide 1 knob 20 with the ferrule 40.

In the embodiments described above, the fastening sleeve 10 is crimped using collars 17, 18; however, the fastening sleeve 10 may be pressed and crimped with a crimping tool, in which case the collar is not required. However, when crimped with a collar, precision is required! It's good, and there are few disturbances due to heat cycles, etc. 1) The bracket 1) may be formed of a shape memory alloy and crimped using the shape memory effect, and in this case as well, no collar is required. Similarly, guide sleeve 20
．． The holding sleeve 30 and the ferrule 40 can be made of shape memory alloy.

In addition, as shown in FIG. 11, the fixed IJ-F.

By attaching the rubber boot 19 to the proximal end side at 10 degrees, a force 2 can be applied, and this trap can prevent damage to the optical fiber cable 1 when attaching and detaching the plug.

The optical connector plug of the present invention can be attached to a socket or the like as it is to form an optical connector, but it can also be used by being housed in a housing. An example is shown in FIG.

The housing 60 is formed into a substantially cylindrical shape with one through hole 61 provided in the length direction, and accommodates the plug therein. An uncut 62 is provided at the tip side of the through hole 61, and another corresponding jack is provided.

Can be detachably connected to an adapter etc. A locking portion 63 is provided at the proximal end of the through hole 61, and the plug is locked here.

The plug is constructed by inserting the holding sleeve 30 and ferrule 40 into the through hole 61 from the proximal end, and engaging the flange 33 with the stepped portion 64 of the locking portion 63 to prevent movement in the distal direction and to lock the plug. Attach the IE female spring 53 to the stop spring insertion hole 65 provided at an appropriate position on the proximal side of the portion 63, and then insert the washer 5.
1, the proximal force ' is applied via the elastic body 52.
It is fixed to the nose housing 60 to prevent movement in the direction.

As explained above, the present invention has a configuration in which a fixing sleeve, a guide sleeve, a holding sleeve, and a ferrule are fitted to form a plug, and the fixing to an optical fiber cable is performed only by crimping, including the attached parts. The structure can be simplified, it can be manufactured at low cost, it can be easily attached without damaging fine wires, and it can be firmly fixed to the optical fiber cable without using adhesive. This has the effect of making it simple and quick. father,
In the plug of the present invention, all parts can be attached from one direction in one direction, and since no adhesive is used, assembly can be easily automated.

[Brief explanation of the drawing]

Figure 1 is a sectional view showing an example of a conventional optical connector plug.
Figure 2 is a cross-sectional view showing one embodiment of the optical connector plug of the present invention, Figure 3 is a cross-sectional view showing an example of the fixing sleeve and its attached parts used in the above embodiment, and Figure 4 is a cross-sectional view showing an example of the fixing sleeve used in the above embodiment. FIG. 5 is a top view showing the optical fiber cable inserted into the fixing sleeve, FIG. 6 is a top view showing an example of the guide sleeve used in the above embodiment, and FIG. FIG. 8 is a sectional view showing an example of a holding sleeve used in the above embodiment, FIG. 8 is a sectional view showing an example of a ferrule used in the above embodiment, and FIG. 9 is a sectional view showing a locking member used in the above embodiment. , Fig. 10 is a sectional view showing another example of the fixing sleeve used in the present invention, Fig. 11 is a sectional view of the main part showing the plug of the above embodiment with a rubber boot attached, and Fig. 12 is a sectional view of the plug of the present invention. FIGS. 13 and 14 are cross-sectional views showing other examples of ferrules that can be used in the plug of the present invention, respectively. 1... Optical fiber cable 1a... Bare wire 1b...
・Core 1C...Grade 10...Fixed sleeve] 1...Coated fixing part 15...Fiber fixing part 16...Fine sleeve 17.18...Collar 20...Guide sleeve 30 ...
Holding sleeve 31... Fitting part 34... Holding part 40... Ferrule fitting... Fitting part 42
... Holding part 50 ... Locking member 60 ...
Housing agent Patent attorney Mura 1) Mikio Figure 10 Figure 11-r Figure 12 75- Figure 13 Figure 14 Figure 4

Claims (1)

[Scope of Claims] fil An optical connector plug to be attached to an optical fiber cable in which the coating at the distal end is removed so that the strands and core wires protrude in steps, the optical fiber cable having the above-mentioned optical fiber cable on the proximal end side. a fixing sleeve comprising a fiber fixing part that tightens and crimps the broken part of the fixing sleeve; a guide sleeve for inserting the strands protruding from the distal end of the fixing sleeve and holding the strands in the axial direction; , providing a fitting part for fitting the fixing sleeve,
a holding sleeve provided with a guide sleeve holding part for holding the guide sleeve on the distal end side; An optical connector plug comprising: a ferrule for holding the optical connector plug; (2) The optical connector plug according to item 1, wherein a collar is fitted over the fiber fixing portion of the fixing sleeve, and the fiber fixing portion is crimped onto the core wire. (3) Insert the optical fiber cable from which the coating at the tip has been removed so that only the strands protrude into the fixing sleeve,
The optical connector plug according to item 1 above, wherein the fixing sleeve and the wire are crimped together with a Hoto sleeve interposed. (4) The optical connector plug according to item 1 above, wherein the ferrule is one that is integrally provided with the function of a holding sleeve. (54) The above-mentioned item 1, 2, 3 or 3, wherein a collar is fitted over the covering fixing part of the fixing sleeve, and the covering fixing part is crimped to the coating of the optical fiber cable. Optical connector plug described in Section 4.