JPH0750221B2 - Optical connector terminal structure - Google Patents

Description

The present invention relates to a terminal structure of an optical connector, and more particularly to a fixing structure for an optical fiber.

[Conventional technology]

Conventionally, when the optical fiber is bonded and fixed to the ferrule of the optical connector, the structure shown in FIG. 5 has been adopted. That is, after adhering the optical fiber core wire 2 to the ferrule 1, it is necessary to adhere the tensile strength fiber 3 and the optical fiber jacket 4 to each other for tensile strength and protection of the optical fiber.
In order to bond them, the adhesive 5 is directly applied to the tensile strength fiber 3 and the optical fiber jacket 4, and the sleeve 6 is covered to bond and fix them.

[Problems to be Solved by the Invention]

However, in the above-mentioned conventional fixing structure, since there is the gap 7 between the sleeve 6 and the optical fiber jacket 4, the fixing force of the optical fiber jacket 4 depends entirely on the adhesive 5. Therefore, since a sufficient adhesive force cannot be obtained with a normal adhesive, the optical fiber jacket 4 may come off due to an external force.

Further, since the adhesive 5 is directly applied to the tensile strength fiber 3, the adhesive 5 penetrates into the inside of the optical fiber,
Since it is cured as it is to cure the optical fiber, there is a risk of breaking when the optical fiber is bent by an external force. Furthermore, since there is a large gap 8 between the ferrule 1 and the sleeve 6, the sleeve 6 may be fixed in a state of being offset with respect to the ferrule 1. Then, in the biased state, the sleeve 6 is attached to the ferrule 1.
Is bent, it is more likely to receive an external force, and the strength is reduced due to uneven adhesion and fixation.

On the other hand, as described above, there is a gap 7 between the sleeve 6 and the optical fiber jacket 4, and there is a possibility that they may be fixed in a biased state.

Further, in the method of fixing the optical fiber by caulking the sleeve 6 without using an adhesive, the outer diameter of the optical fiber jacket 4 varies widely. However, there is a drawback that the optical fiber jacket 4 cannot be sufficiently fixed.

The object of the present invention has been made in view of the above-mentioned drawbacks, and while firmly fixing the optical fiber cover, it is possible to prevent the optical fiber from being rigidized due to the permeation of the adhesive agent and to prevent the optical fiber from being broken. To provide the terminal structure of.

[Means for Solving the Problems]

In order to achieve the above-mentioned object, the terminal structure of the optical connector according to the present invention is provided with a slotted portion in the axial direction from the rear end face to the central position, and the outer diameter of the portion where the slitted portion is not provided is slotted. A slitting sleeve slightly larger than the outer diameter of the part where the part is provided is placed over the tensile strength fiber of the optical fiber covering the rear end of the ferrule and the optical fiber jacket, and the part of the part where the slitting part of the slitting sleeve is provided is A press-fitting sleeve having an inner diameter slightly smaller than the outer diameter, the outer diameter of which corresponds to the outer diameter of a portion of the slitting sleeve where the slitting portion is not provided and which is not provided with the slitting portion, It is configured to be press-fitted onto the outer periphery from the rear.

[Action]

As described above, in the present invention, since the slitting portion is provided on the slitting sleeve and is easily deformed, even if the outer diameter of the optical fiber jacket, which generally has a large variation, of the press-fitting sleeve is used. The slotted sleeve is deformed by press fitting,
The optical fiber jacket can be reliably contacted and the optical fiber jacket can be mechanically fixed. Further, since the slitting sleeve comes into contact with the optical fiber jacket, the layer of the adhesive can be controlled uniformly at all times, so that the fixing with the adhesive can be surely performed. In this way, the mechanical fixing and the fixing with the adhesive can be performed simultaneously and surely, so that the optical fiber jacket is completely fixed.

In addition, since the tensile strength fiber is mechanically fixed by press fitting the press fitting sleeve into the slitting sleeve, it is not necessary to directly apply the adhesive to the tensile strength fiber. Is prevented.

Further, since the sleeve is fixed by press-fitting, the sleeve is not fixed to the ferrule in an offset state, and the appearance is good.

〔Example〕

The present invention will be described in detail below with reference to the embodiments shown in the drawings.

FIG. 1 is a vertical sectional view showing an embodiment of the terminal structure of an optical connector according to the present invention. The optical fiber core wire 11 is adhesively fixed to the ferrule 10 and the ferrule 10
A cylindrical slotting sleeve 12 is put on the rear end of the rear end, and the tensile strength fiber 13 is used as a ferrule 10 and a slotting sleeve.
It has a structure sandwiched between 12 and. The slitting sleeve 12 is provided with a slitting portion 12a in the axial direction, as shown in FIGS. 2 and 3. In the present embodiment, the slit portion 12a is provided from the rear end surface to the central portion position, and has a structure in which a plurality of slit portions 12a are provided in the circumferential direction.

An adhesive 15 is applied to the rear end 12b of the slitting sleeve 12 and the optical fiber jacket 14, and a cylindrical press-fitting sleeve 16 is provided on the outer periphery of the rear end 12b of the slitting sleeve 12.
Has been press-fitted. The inner diameter of the press-fitting sleeve 16 is formed slightly smaller than the outer diameter of the rear end portion 12b of the slotting sleeve 12.

Now, when this press-fitting sleeve 16 is press-fitted onto the outer periphery of the slotting sleeve 12 from the rear, since the slotting portion 12a is provided in the slotting sleeve 12, the rear end portion 12b of the slotting sleeve 12 is easily deformed, The press-fitting of the press-fitting sleeve 16 easily deforms the inside. In this way, the rear end portion 12b of the slitting sleeve 12 is deformed inward, so that the tensile strength fiber 13 sandwiched between the slitting sleeve 12 and the ferrule 10 is pressed and mechanically fixed. To be done.

At the same time, the optical fiber jacket 14 is also pressed and mechanically fixed by the rear end portion 12b of the slitting sleeve 12, and the optical fiber jacket 14 and the slitting sleeve 12 are in close contact with each other. Is thinned and hardened uniformly.

〔The invention's effect〕

As described above, according to the terminal structure of the optical connector according to the present invention, the slitting portion is provided on the slitting sleeve, and the structure is easily deformed. Even with respect to the outer diameter, the slitting sleeve is deformed by the press-fitting of the press-fitting sleeve and surely contacts the optical fiber jacket, and the optical fiber jacket can be mechanically and firmly fixed. Further, since the slitting sleeve comes into contact with the optical fiber jacket, the layer of the adhesive can be controlled uniformly at all times, so that the fixing with the adhesive can be surely performed. In this way, mechanical fixing and fixing with an adhesive can be performed at the same time and surely, so that there is an excellent effect that the optical fiber jacket can be firmly fixed.

In addition, since the tensile strength fiber can be mechanically fixed by press-fitting the press-fitting sleeve into the slitting sleeve, it is not necessary to directly apply the adhesive to the tensile strength fiber. There is also an effect that the accompanying breakage can be prevented.

Further, since the fixing is performed by press fitting, the sleeve is not fixed in a state of being offset to the ferrule, and there is an effect that the appearance is also good. Further, in the present invention, the slitting portion is provided in the axial direction from the rear end surface of the slitting sleeve to the central portion position, the outside diameter of the portion other than this portion is slightly increased, and the outside diameter of the press-fitting sleeve press-fitted into this slitting portion. To match the outer diameter of the part of the slitting sleeve where the slitting part is not provided, and the press-fitting sleeve has no slit. For this reason, when the press-fitting sleeves are press-fitted into the slit sleeves, they have the same diameter, and the slits are not visible, which is also good in terms of appearance.

[Brief description of drawings]

1 is a longitudinal sectional view showing an embodiment of the terminal structure of an optical connector according to the present invention, FIG. 2 is a perspective view of a slotting sleeve and a press-fitting sleeve before press-fitting, and FIG. 3 is a slotting of FIG. FIG. 4 is a side view of the sleeve and the press-fitting sleeve, FIG. 4 is a perspective view showing another embodiment of the slitting sleeve and the press-fitting sleeve,
FIG. 5 is a longitudinal sectional view showing an example of a terminal structure of a conventional optical connector. 10 …… Ferrule, 11 …… Optical fiber core wire, 12 …… Slitting sleeve, 12a, 12c …… Slitting part, 13 …… Tensile fiber, 14 …… Optical fiber jacket, 15 …… Adhesive, 16 ...... Press-fit sleeve.

Front page continuation (72) Inventor Takeshi Oki 3-20-4 Nishishinbashi, Minato-ku, Tokyo Inside Nippon Electric Engineering Co., Ltd. (56) Reference JP-A-60-86508 (JP, A) JP-A-62 -138805 (JP, A) Actual Open Sho 58-109713 (JP, U) Actual Open Sho 62-87303 (JP, U) Actual Open Sho 60-51511 (JP, U)

Claims (1)

[Claims] 1. A terminal structure of an optical connector for fixing an optical fiber to an optical connector ferrule, wherein a slitting portion is provided in an axial direction from a rear end face to a central portion position, and an outer diameter of a portion where the slitting portion is not provided is set. A slitting sleeve slightly larger than the outer diameter of the part where the slitting part is provided is put on the tensile strength fiber of the optical fiber covering the rear end of the ferrule and the optical fiber jacket, and the slitting part of the slitting sleeve is provided. The press-fitting sleeve having an inner diameter slightly smaller than the outer diameter of the slotted portion, the outer diameter of which corresponds to the outer diameter of the portion of the slotted sleeve where the slotted portion is not provided and which is not provided with the slotted portion. A terminal structure for an optical connector, which is press-fitted onto the outer circumference of a split sleeve from the rear.