JP3771158B2 - Parallel optical fiber terminal structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a parallel optical fiber terminal structure, and in particular, can ensure the strength in the drawing direction and can relax the bending rate of the coating removal portion to ensure the optical fiber characteristics, and further improve the assembling property. The present invention relates to a parallel optical fiber terminal structure having a simple configuration that can be realized.
[0002]
[Prior art]
A parallel optical fiber terminal structure 101 shown in the longitudinal sectional view of FIG. 5 is conventionally known.
In this parallel optical fiber terminal structure 101, the coating removal portions 103 and 103 of a plurality of optical fibers 102 and 102 (two examples are shown in the figure) are parallel to each other closer to the distance between adjacent centers of the optical fibers 102 and 102. It is used for a parallel transmission connector or the like arranged in
[0003]
In FIG. 5 , the parallel optical fiber terminal structure 101 has two optical fibers 102 and 102 arranged in parallel and inscribed and fixed to the hollow portion of the resin tube 104 by the filling resin A, and exposed at the tip thereof. , 103 are held by a ceramic capillary 105, and the capillary 105 and the resin tube 104 are integrally formed by being inscribed and fixed to a supporting outer body 106 such as a stainless steel pipe.
[0004]
The two coating removal portions 103 and 103 are respectively exposed and extended from the tips of the optical fibers 102 and 102, inserted into the two pores 105 a and 105 a of the capillary 105, and bonded and fixed by the filling resin B. Has been.
The two pores 105a and 105a of the capillary 105 are formed in parallel with each other so that the distance between the centers is closer to the distance between the centers of the optical fibers 102 and 102 adjacent to each other.
[0005]
Between the distal ends of the optical fibers 102 and 102 and the capillaries 105, the covering removal portions 103 and 103 are inclined with respect to the axis of the optical fibers 102 and 102 over a length X separating them. An oblique section 107 that is bent in a straight line is formed.
[0006]
The parallel optical fiber terminal structure 101 having such a configuration needs to counter the pulling force received by the connector attaching / detaching operation or the like by the mutual adhesive portion 108 that adheres to each other between the support outer casing 106 and the resin tube 104. The resin tube 104 needs to be inserted as deeply as possible into the support exterior body 106.
[0007]
[Problems to be solved by the invention]
On the other hand, when the insertion dimension of the resin tube 104 is increased, the length X of the oblique section 107 between the tip ends of the optical fibers 102 and 102 and the capillary 105 is shortened.
[0008]
When X is short, the coating removal portions 103 and 103 in the skew section 107 are bent at a steep inclination angle at the both end positions, that is, at the front end portions of the optical fibers 102 and 102 and the rear end portion of the capillary 105.
Since the coating removal portions 103 and 103 may cause deterioration of optical fiber characteristics such as transmission loss due to a sharp bend and may cause fiber core breakage, the length X of the skew section 107 needs to be as large as possible. is there.
[0009]
Thus, the conventional parallel optical fiber terminal structure 101 has a problem that both conditions compete in terms of strength in the drawing direction and bending of the coating removal portion, and accordingly, the two contradictory conditions are met. Because of the need to assemble it along, it was forced to carry out a high degree of accuracy control.
[0010]
The object of the present invention is to secure the strength in the drawing direction, relax the bending of the coating removal portion to ensure the optical fiber characteristics, and further improve the assemblability. It is to provide a parallel optical fiber terminal structure.
[0011]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, the invention of claim 1 includes a plurality of optical fibers inserted and fixed in the hollow portion of the tube along the axial direction thereof,
Capillaries that hold the coating removal portions exposed and formed at the tips of these optical fibers in parallel with each other closer to the distance between the centers of adjacent optical fibers,
In a parallel optical fiber terminal structure composed of a rigid outer pipe member that is fitted with the capillary together with the tube and holds and holds the respective axes on one line.
Forming an abutting portion as a positioning means at the boundary between the tube and the capillary, and forming the coating removal portion boundary of the optical fiber by retreating into the hollow portion of the tube;
Skew interval leading to capillary bent so removed portion to be covered is tilted, by forming between the coating-removing portion boundary within the hollow portion of the tube cross-abutment, forming a parallel optical fiber terminal structure .
[0012]
Therefore, by inserting the tube to a position where it abuts against the mutual abutting portion, the assembling work can be performed while ensuring the placement accuracy.
Further, the skew section can be secured without being affected by the tube arrangement conditions.
[0013]
According to a second aspect of the present invention, a collar as a positioning means is provided in the support sheath so as to separate the distal end portion of the tube and the rear end portion of the capillary, and the boundary of the optical fiber coating removal portion is provided at the distal end of the tube. Formed in the part,
By forming the oblique sections extending in capillary bent so removed portion to be covered is tilted inside the collar, forming a parallel optical fiber terminal structure.
[0014]
By inserting the tube to the position where it comes into contact with the collar, the assembling work can be performed while ensuring the placement accuracy.
Further, the skew section can be secured without being affected by the tube arrangement conditions as in the above-described invention.
[0015]
The skew section of each of the inventions may be filled with an adhesive resin and the covering removal portion may be fixed.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments specifically configured based on the above technical idea will be described below with reference to the drawings.
FIG. 1A is a longitudinal sectional view of a parallel optical fiber terminal structure of the present invention, and FIG.
[0017]
In FIG. 1, the parallel optical fiber terminal structure 1 has a plurality (two in the figure) of optical fibers 2, 2 inserted in parallel into a hollow portion of a resin tube 3 and bonded and fixed. The coating removal portions 4 and 4 exposed at the tip of 2 are inserted into the capillary 5 and bonded and fixed, and the resin tube 3 is provided on the rear end side of the pipe-like support outer body 6 attached to the outer periphery of the capillary 5. Are integrally formed by inscribed fixing.
[0018]
The plurality of optical fibers 2 and 2 are bundled in parallel in the axial direction of the tube 3 and are bonded and fixed by the filling resin A at a position where the boundary of the coating removal portion is retracted into the hollow portion of the tube 3.
At the distal ends of the optical fibers 2 and 2, an oblique section 7 is formed in which the coating removal portions 4 and 4 exposed over a predetermined length X in the hollow portion on the distal end side of the tube 3 are inclined and bent in an oblique direction.
The coating removal portions 4 and 4 in the skew section 7 are fixed with the filling resin B for the coating removal portion. Between the tube 3 and the capillary 5, when the tube 3 is inserted from the rear end of the support exterior body 6, the mutual contact part 8 which each edge part mutually contacts is formed.
[0019]
The capillary 5 is formed in a cylindrical shape or the like with a ceramic material or the like, and two fine holes 5 a and 5 a are formed through the capillary 5 in the longitudinal direction.
The two pores 5a and 5a are formed in parallel with each other closer to the distance between the centers of the two adjacent optical fibers 2 and 2. The two pores 5a and 5a are chamfered in the opening on the rear end side, and the coating removal portions 4 and 4 are inserted into the pores while being guided by the chamfering, and fixed with the filling resin B for the coating removal portion. To do.
[0020]
The support exterior body 6 is a pipe-like member having a large rigidity made of stainless steel or the like. The outer support body 6 is fitted and fixed to the outer periphery of the capillary 5, and the axes of the capillaries 5 and the resin tube 3 are aligned to fix the tube 3 and the outer support body 6 together. As a result, an interbonding portion 9 is formed between the tube 3 and the support exterior body 6 so as to bond them together.
[0021]
In the parallel optical fiber terminal structure 1 having the above-described configuration, since the mutual abutting portion 8 that abuts between the resin tube 3 and the capillary 5 is formed, the capillary 5 is positioned when the resin tube 3 is assembled. It can be used as a means.
Therefore, the positioning function of the mutual contact portion 8 can simplify the assembling work while ensuring the placement accuracy.
[0022]
In addition, since the skew section 7 of the coating removal portions 4 and 4 is arranged in the hollow portion of the resin tube 3, the skew section of the coating removal sections 4 and 4 is not affected by the arrangement conditions of the tubes 3. 7 can be secured. In other words, the mutual adhesion portion 9 between the tube 3 and the support exterior body 6 and the oblique section 7 of the coating removal portions 4 and 4 can be configured under conditions according to the respective needs.
[0023]
Specifically, by arranging the tube 3 so as to be in contact with the capillary 5, it is possible to ensure the maximum size of the mutual adhesive portion 9 between the tube 3 and the support exterior body 6. .
When the mutual bonding portion 9 receives a force in the pulling direction, it generates a counter force in the pulling direction due to a shearing force generated between the tube 3 and the support exterior body 6. Therefore, the strength in the pulling-out direction can be increased by making the mutual adhesive portions 9 large, that is, by making the dimensions longer in the axial direction.
[0024]
Further, the slanting section 7 of the covering removing portions 4 and 4 can ensure the necessary length X in the hollow portion of the tube 3 without questioning the insertion position of the tube 3. The skew section 7 has bending distortion at its corners because the sheath removal portions 4 and 4 are bent at both end positions, that is, at the boundary between the sheath removal portions of the optical fibers 2 and 2 and the rear end portion of the capillary 5. Concentration and transmission loss, etc., cause optical fiber characteristics to deteriorate. Therefore, since the bending angle can be reduced by increasing the length X of the skew section 7, the optical fiber characteristics can be ensured.
[0025]
As described above, the parallel optical fiber terminal structure 1 according to the present invention has a simple configuration that does not require a new additional member, processing, or the like, so that the mutual adhesive portion 9 between the resin tube 3 and the support exterior body 6 is obtained. Corresponding to the length of the stripping section 7 of the coating removal portions 4 and 4, and the bending angle is kept small to reduce transmission loss and breakage. It is possible to prevent such a situation and ensure predetermined optical fiber characteristics.
[0026]
Next, a three-core example of the parallel optical fiber terminal structure according to the present invention will be described. A longitudinal cross-sectional view of a three-core parallel optical fiber terminal structure is shown in FIG. In addition, below, description is abbreviate | omitted by attaching | subjecting the code | symbol of the same member.
[0027]
In FIG. 2, the parallel optical fiber terminal structure 11 has three optical fibers 2 inserted in parallel in the hollow portion of the resin tube 3 and bonded and fixed, and is exposed at the tip of the optical fiber 2. The covering removal portion 4 is inserted into the capillary 5 and bonded and fixed, and the resin tube 3 is inscribed and fixed to the rear end side of the pipe-shaped outer support body 6 attached to the outer periphery of the capillary 5. It is composed integrally.
[0028]
A plurality of optical fibers 2... Form a skew section 7 by retreating the boundary of the coating removal portion into the hollow portion of the tube 3. Further, an abutting portion 8 is formed between the tube 3 and the capillary 5 so that the ends of the tube 3 come into contact with each other when the tube 3 is fitted from the rear end of the support exterior body 6.
[0029]
Also in this case, since the positioning accuracy is ensured by the mutual abutting portion 8, the necessary pulling force can be ensured in the same manner as described above, and the length X of the skew section 7 of the sheath removing portion 4. Correspondingly, the bending angle can be kept small, transmission loss can be reduced and breakage can be prevented, and predetermined optical fiber characteristics can be secured.
[0030]
Next, another embodiment of the present invention will be described. FIG. 3 shows a longitudinal sectional view of a parallel optical fiber terminal structure according to another embodiment of the present invention.
In FIG. 3, the parallel optical fiber terminal structure 21 includes a collar 22 having a length separating a predetermined distance X between the tube 3 and the capillary 5 in the exterior support 6. Since the collar 22 can position the optical fibers 2 and 2 through the tube 3 when the tube 3 is fitted from the rear end of the support exterior body 6, the assembling work can be simplified while ensuring the placement accuracy. Can be
[0031]
In this case, by determining the position of the tip of the optical fibers 2 and 2 with respect to the tube 3 in relation to the collar 22, it is necessary as the oblique section 7 between the tip of the optical fibers 2 and 2 and the capillary 5. Length can be secured.
[0032]
Next, a reference example of the present invention will be described .
In FIG. 4, the parallel optical fiber terminal structure 31 forms a stepped portion 33 in the support exterior body 32 as a positioning means with which the distal end portion of the tube 3 abuts.
By determining the position of the tips of the optical fibers 2, 2 with respect to the tube 3 in relation to the stepped portion 33, the length required as the oblique section 7 between the tips of the optical fibers 2, 2 and the capillary 5 is determined. Can be secured.
[0033]
Note that the parallel optical fiber terminal structure according to the present invention is not limited to the above-described two-core use for two optical fibers and three-core use for three optical fibers, but includes, for example, a matrix arrangement in two rows and two columns. Since it is clear that the present invention can be similarly applied to a case of four or more cores using more than one parallel optical fiber, the description thereof is omitted.
[0034]
【The invention's effect】
The parallel optical fiber terminal structure of the present invention has the following effects.
The parallel optical fiber terminal structure having the above-described structure is formed by a simple structure that does not require a new additional member or the like, thereby forming a maximum size mutual adhesive portion between the tube and the supporting outer casing, and pulling out the tube. It is possible to configure so as to satisfy both the strength of the direction and the condition of bending of the coating removal portion (longening the oblique section and avoiding sudden bending of the optical fiber) . Since the condition of accuracy control at the time of assembly is relaxed, the assemblability can be improved.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view (a) of a parallel optical fiber terminal structure of the present invention and a sectional view taken along the line II of FIG.
FIG. 2 is a longitudinal sectional view of a three-core parallel optical fiber terminal structure according to an embodiment of the present invention. FIG. 3 is a longitudinal sectional view of a parallel optical fiber terminal structure according to another embodiment of the present invention. Vertical cross-sectional view of a parallel optical fiber terminal structure according to a reference example of the above [FIG. 5] Vertical cross-sectional view of a conventional parallel optical fiber terminal structure [Explanation of symbols]
1, 11, 21, 31 Parallel optical fiber terminal structure
2 Optical fiber
3 tubes
4 Cover removal part
5 Capillary
6, 32 Supporting exterior body
7 Skew section
8 Mutual contact part (positioning means)
9 Mutual adhesion part
22 Color (Positioning means)
33 Step (Positioning means)

Claims (3)

A plurality of optical fibers inserted and fixed along the axial direction in the hollow portion of the tube;
Capillaries that hold the coating removal portions exposed and formed at the respective tips of these optical fibers in parallel with each other closer to the distance between the centers of adjacent optical fibers,
In a parallel optical fiber terminal structure composed of a rigid sheath material that is fitted and inserted with the tube to hold each axis fixedly on one line,
Forming an abutting portion as a positioning means at the boundary between the tube and the capillary, and forming an optical fiber sheath removing portion boundary by retreating into the hollow portion of the tube;
Parallel optical fiber terminal structure characterized in that the skew interval leading to capillary bent so removed portion to be covered is tilted, is formed between the coating-removing portion boundary within the hollow portion of the tube cross-abutment. A plurality of optical fibers inserted and fixed along the axial direction in the hollow portion of the tube;
Capillaries that hold the coating removal portions exposed and formed at the respective tips of these optical fibers in parallel with each other closer to the distance between the centers of adjacent optical fibers,
In a parallel optical fiber terminal structure composed of a rigid sheath material that is fitted and inserted with the tube to hold each axis fixedly on one line,
While providing a collar as a positioning means in the support sheath so as to separate the distal end portion of the tube and the rear end portion of the capillary, and forming a coating removal portion boundary of the optical fiber at the distal end portion of the tube,
Parallel optical fiber terminal structure characterized in that the formation of the skew interval leading to capillary bent so removed portion to be covered is tilted to the inside of the collar.   The parallel optical fiber terminal structure according to claim 1 or 2, wherein the skew removal section is filled with an adhesive resin to fix the coating removal portion.

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