JP2005345579A - Optical fiber ferrule and manufacturing method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical fiber ferrule which is less likely to cause pistoning even with time, and therefore has high reliability over a long period of time, and a method for manufacturing the same.
An optical fiber core wire 10 having a plurality of coating layers on an optical fiber ferrule body 20 having an optical fiber insertion hole 21 penetrating from a front end to a rear end, and an inner coating layer 12 having a predetermined length from the front end. The optical fiber core wire 10 from which the outer coating layer 13 has been removed is inserted into the optical fiber insertion hole 21, and then the portion of the optical fiber core wire 10 from which the outer coating layer 13 has been removed and the outer coating layer 13 are left. A method of manufacturing an optical fiber ferrule, wherein the optical fiber core wire 10 is fixed to the optical fiber ferrule body 20 by sandwiching and holding the portion having the optical fiber.
[Selection] Figure 5

Description

  The present invention relates to an optical fiber ferrule in which an optical fiber ferrule body is attached to the tip of an optical fiber core wire, particularly a plastic optical fiber core wire, and a method for manufacturing the same.

In recent years, informatization of vehicles such as automobiles has progressed dramatically, and the current position of the vehicle is displayed on a map using a car navigation system, or the congestion control of the vehicle is managed using an intelligent road traffic system. This is happening. Thus, in order to cope with the increase in the amount of information handled in the vehicle, it is necessary to further increase the signal speed.
On the other hand, when the signal speed in the vehicle increases or the amount of information processing increases, the influence of noise during communication becomes gradually negligible.

  Therefore, from the viewpoints of increasing the signal speed, increasing the amount of information processing, eliminating the influence of noise, and the like, optical fiber core wires have been used for signal transmission paths in vehicles. Particularly in the case of optical fiber cores, plastic optical fiber cores are being used more frequently than silica glass optical fiber cores because of the advantages such as low cost and excellent flexibility.

By the way, the plastic optical fiber core wire is provided with a plurality of coatings such as nylon on the plastic optical fiber. In the case of a normal plastic optical fiber core wire, two layers of an inner layer coating and an outer layer coating are applied on the optical fiber.
When a plastic optical fiber having a coating on a plastic optical fiber is used for a signal transmission path, an optical fiber ferrule body for connecting a connector is often mounted at least at one end thereof.

By the way, as a method of attaching the optical fiber ferrule main body to the tip of the plastic optical fiber core wire, an optical fiber fixing member is fitted into an opening communicating with the optical fiber insertion hole of the optical fiber ferrule main body, and the optical fiber core wire is attached to the optical fiber ferrule. There is a method of fixing to the main body (Patent Document 1).
This method will be described with reference to FIGS. 7 is a longitudinal sectional view of the optical fiber ferrule (view of the cut surface along the central axis of the optical fiber core wire), and FIG. 8 is a transverse sectional view of the optical fiber ferrule body 1 (optical fiber core wire). The plane orthogonal to the central axis of the figure.

  7 and 8, an optical fiber insertion hole 2 is formed in the central axis portion of the optical fiber ferrule main body 1 so as to penetrate from the front end to the rear end, and the optical fiber core wire 3 is inserted into the optical fiber insertion hole 2. Has been inserted. The optical fiber ferrule body 1 has the tip of the optical fiber core wire 3 facing the tip of the optical fiber ferrule body 1 in a substantially flush state.

The optical fiber core 3 is obtained by applying a protective coating 3b to the optical fiber 3a. The protective coating 3b may be a single layer or a plurality of layers. Before the optical fiber core wire 3 is inserted into the optical fiber insertion hole 2 of the optical fiber ferrule body 1, the protective coating 3 b at the tip is removed by a predetermined length.
The optical fiber ferrule body 1 is provided with an opening 4 communicating with the optical fiber insertion hole 2. The opening 4 is fitted with an optical fiber fixing member 5 that holds and fixes the protective coating 3b of the optical fiber core 3 inserted through the optical fiber ferrule body 1.

  As shown in the figure, the optical fiber fixing member 5 has a substantially U-shaped cross section. On the inner surface of the U-shaped portion, there is a projection 6 that holds the protective coating 3b of the optical fiber core wire 3 inside. A plurality of the wires 3 are provided in a direction perpendicular to the central axis of the wire 3, and the projections 6 bite into and hold the protective coating 3 b to firmly fix the optical fiber core wire 3 to the optical fiber ferrule body 1.

Reference numeral 7 in the drawing is provided on both sides of the optical fiber fixing member 5 so that the optical fiber fixing member 5 fitted in the opening 4 of the optical fiber ferrule main body 1 does not come out of the optical fiber ferrule main body 1. The latching hole 8 which the latching protrusion 8 which latches latches is shown.
Reference numeral 9 is a support base provided at the bottom of the opening 4, and the optical fiber core wire 3 inserted into the optical fiber insertion hole 2 is placed on the support base and placed on the support base 9. In this state, the optical fiber core wire 3 is sandwiched between optical fiber fixing members 5 and fixed to the optical fiber ferrule body 1.

  Similar to Patent Document 1 is also disclosed in Patent Document 2.

JP-A-64-88406 No. 07-5445

  By the way, in the case of the optical fiber ferrule obtained by fixing the optical fiber core wire 3 to the optical fiber ferrule body 1 using the optical fiber fixing member 5 described above, the temperature of the conventional optical fiber ferrule changes with time. When used in a severe place for a long time, as shown in FIG. 9A, the optical fiber 3a of the optical fiber core wire 3 protrudes from the tip of the optical fiber ferrule body 1, or conversely, as shown in FIG. 9B. As can be seen, there were occasional cases of retraction or pistoning.

  In order to solve the above problems, an object of the present invention is to provide an optical fiber ferrule that is less likely to cause pistoning over time, and therefore has a long-term reliability, and a manufacturing method for obtaining such an optical fiber ferrule. There is to do.

  In order to achieve the above object, the present invention according to claim 1 is an optical fiber core wire having a plurality of coating layers on an optical fiber ferrule body having an optical fiber insertion hole penetrating from the front end to the rear end. The optical fiber core wire from which the outer coating layer has been removed is inserted into the optical fiber insertion hole while leaving the inner coating layer of a predetermined length from the portion, and then the optical fiber core wire is removed from the outer coating layer. And the portion having the outer coating layer are sandwiched and held, and the optical fiber core wire is fixed to the optical fiber ferrule body.

  According to the method for manufacturing an optical fiber ferrule according to claim 1, the optical fiber core wire having a plurality of coating layers inserted into and fixed to the optical fiber ferrule body is a portion from which the outer coating layer is removed. In other words, the outer covering layer is removed and the outer covering layer is removed as in the conventional case because the outer covering layer is sandwiched and held by both the part where the outer covering layer is removed and only the inner covering layer remains and the part where the outer covering layer is not removed. Unlike optical fiber ferrules that are clamped and held only from the uncovered part, that is, from the outer coating layer, the holding force is maintained because the optical fiber is clamped and held from the inner coating layer closer to the optical fiber located at the center. And the pistoning is less likely to occur over time.

  The optical fiber ferrule manufacturing method according to claim 2 is the optical fiber ferrule manufacturing method according to claim 1, wherein the optical fiber ferrule body has an opening communicating with the optical fiber insertion hole from a side surface side. An optical fiber fixing member having a sandwiching portion that sandwiches and holds the portion of the optical fiber core wire inserted through the optical fiber insertion hole from which the outer coating layer has been removed and the portion having the outer coating layer simultaneously. Is inserted and fitted into the opening, and the optical fiber core wire is fixed to the optical fiber ferrule body.

  According to the method of manufacturing an optical fiber ferrule according to claim 2, the optical fiber fixing member is provided in an opening provided so as to communicate with the optical fiber insertion hole from the side surface side of the optical fiber ferrule body. Since it can be inserted and fitted, the portion of the optical fiber core wire inserted through the optical fiber insertion hole from which the outer coating layer has been removed and the portion having the outer coating layer can be sandwiched and held at the same time, Not only is it difficult to cause pistoning, but the fixing operation of the optical fiber core wire to the optical fiber ferrule body is also extremely easy.

  Furthermore, the manufacturing method of the optical fiber ferrule according to claim 3 is the manufacturing method of the optical fiber ferrule according to claim 2, wherein the optical fiber fixing member connects the optical fiber core wire inserted through the optical fiber insertion hole to the outer side. It is characterized by having a sandwiching portion having a substantially U-shaped cross section for sandwiching and holding the portion from which the coating layer has been removed and the portion having the outer coating layer at the same time.

  According to the method for manufacturing an optical fiber ferrule according to claim 3, the optical fiber fixing member has a holding portion having a substantially U-shaped cross section. The portion from which the outer coating layer is removed and the portion having the outer coating layer can be sandwiched and held simultaneously.

  A method for manufacturing an optical fiber ferrule according to claim 4 is the method for manufacturing an optical fiber ferrule according to any one of claims 1 to 3, wherein the outer coating layer of the optical fiber core wire is removed. Is held with a holding force σa, and the portion having the outer coating layer is held with a holding force σb smaller than the holding force σa.

  According to the method for manufacturing an optical fiber ferrule as described above, the portion of the optical fiber core wire from which the outer coating layer is removed is held by the holding force σb of the portion having the outer coating layer. By increasing the holding force σa to be performed, pistoning in the optical fiber ferrule can be prevented more reliably.

Furthermore, the manufacturing method of the optical fiber ferrule of Claim 5 WHEREIN: The manufacturing method of the optical fiber ferrule in any one of Claims 1-4 WHEREIN: The said optical fiber core wire is a plastic optical fiber core wire. Features.
According to the method for manufacturing an optical fiber ferrule according to claim 5, the plastic optical fiber core wire is used as the optical fiber core wire, so that a lower cost optical fiber ferrule can be provided. .

  In addition, an optical fiber ferrule according to claim 6 includes an optical fiber ferrule body having an optical fiber insertion hole penetrating from the front end to the rear end and an opening communicating with the optical fiber insertion hole from the side surface side, An optical fiber core having a coating layer, wherein the outer coating layer is removed with the inner coating layer remaining at a predetermined length from the tip, and the optical fiber core is inserted into the optical fiber insertion hole, and the opening A sandwiching portion that sandwiches and holds the portion of the optical fiber core wire that is inserted and fitted into the optical fiber insertion hole and from which the outer coating layer has been removed and the portion having the outer coating layer. And an optical fiber fixing member.

  According to the optical fiber ferrule according to claim 6, an optical fiber fixing member is inserted and fitted into an opening provided so as to communicate with the optical fiber insertion hole from the side surface side of the optical fiber ferrule main body, Since it is easy to sandwich and hold the portion of the optical fiber core wire inserted through the optical fiber insertion hole from which the outer coating layer has been removed and the portion having the outer coating layer at the same time, it is difficult to cause pistoning. In addition, the workability of fixing the optical fiber core wire to the optical fiber ferrule body can be improved.

  The optical fiber ferrule according to claim 7 is the optical fiber ferrule according to claim 6, wherein the optical fiber fixing member is formed by removing the outer coating layer from the optical fiber core wire inserted through the optical fiber insertion hole. It is characterized by having a sandwiching part having a substantially U-shaped cross section for sandwiching and holding the part and the part having the outer coating layer at the same time.

  According to the optical fiber ferrule according to claim 7, the optical fiber fixing member has a sandwiching portion having a substantially U-shaped cross section, so that the outer coating layer of the optical fiber core wire is removed. The part and the part having the outer coating layer can be easily and reliably held and held at the same time.

Furthermore, an optical fiber ferrule according to claim 8 is the optical fiber ferrule according to claim 6 or 7, wherein the optical fiber core wire is a plastic optical fiber core wire. .
According to the optical fiber ferrule of the eighth aspect thus configured, since the plastic optical fiber core wire is used as the optical fiber core wire, a lower cost optical fiber ferrule can be provided.

  As described above, according to the optical fiber ferrule and the manufacturing method of the optical fiber ferrule of the present invention, it is difficult to cause the pistoning of the optical fiber ferrule body of the optical fiber, and therefore, the optical fiber ferrule having high reliability for a long time and the manufacturing thereof. A method can be provided.

  Embodiments of the optical fiber ferrule and the manufacturing method thereof according to the present invention will be described in detail with reference to FIGS.

FIG. 1 shows an example of a plastic optical fiber core wire 10 used in the present invention. As shown in FIG. 1, for example, an inner coating layer 12 and an outer coating layer 13 made of nylon, for example, are sequentially coated on the outside of a plastic optical fiber 11 that uses PMMA as a core material. The outer coating layer 13 having a predetermined length is removed in advance at the tip of 10 before being inserted into the optical fiber insertion hole of the optical fiber ferrule body.
Now, one specific example of the plastic optical fiber core wire 10 is as follows. The outer diameter of the plastic optical fiber 11 is 1.00 mm, the outer diameter of the inner coating layer 12 is 1.51 mm, and the outer diameter of the outer coating layer 13. That is, the outer diameter of the plastic optical fiber core wire 10 is 2.30 mm.

  FIG. 2 shows that the plastic optical fiber core wire 10 shown in FIG. 1 is inserted into the optical fiber insertion hole 21 provided in the central shaft portion of the optical fiber ferrule body 20 from the portion where the inner coating layer 12 is exposed. It shows a state in which it is inserted and its tip is almost flush with the tip of the optical fiber ferrule body 20. In this figure, reference numeral 22 denotes an opening formed so as to communicate with the optical fiber insertion hole 21 from the side surface side of the optical fiber ferrule body 20, that is, from a direction orthogonal to the optical fiber insertion hole 21. When the plastic optical fiber core wire 10 is inserted into the optical fiber insertion hole 21 of the optical fiber ferrule body 20 and the tip thereof is positioned at a position retracted by 50 to 100 μm from the tip of the optical fiber ferrule body 20, the optical fiber is inserted into the opening 22. The fixing member 23 is inserted and fitted, and both the inner coating layer 12 and the outer coating layer 13 of the plastic optical fiber core wire 10 are clamped by the holding portion 24 at the tip of the optical fiber fixing member 23, and the plastic optical fiber core wire is inserted. 10 is held and fixed to the optical fiber ferrule body 20.

FIG. 3 shows a perspective view of the optical fiber ferrule body 20 in FIG. 2 with the optical fiber ferrule body 20 omitted in order to easily understand the state of the optical fiber fixing member 23 and the plastic optical fiber core wire 10 held by the optical fiber fixing member 23. ing.
As shown in FIG. 3, the optical fiber fixing member 23 is provided with protrusions 25 and 26 in order to securely clamp the inner coating layer 12 and the outer coating layer 13 inside the clamping portions 24 and 24.

4 shows a state in which the optical fiber fixing member 23 is inserted and fitted into the opening 22 in FIG. 2, and the optical fiber fixing member 23 is inserted, and the holding portion 24 of the optical fiber fixing member 23 is a plastic optical fiber. FIG. 2 is a so-called cross-sectional view in which the core wire 10 is sandwiched and cut in a direction perpendicular to the central axis of the optical fiber ferrule body 20.
Here, FIG. 4A is a cross-sectional view of a portion where the outer covering layer 13 is sandwiched, and FIG. 4B is a cross-sectional view showing a state where the inner covering layer 12 is sandwiched. FIG. 5 is a top sectional view of the cut surface including the central axis of the optical fiber ferrule body 20 in the same state, that is, a longitudinal sectional view.

As shown in FIGS. 3 to 5, the sandwiching portion 24 has a substantially U-shaped cross section, and in this cross section, the sandwiching portion 24 includes the inner coating layer 12 and the outer coating layer of the plastic optical fiber core wire 10. Both are held in a fork shape.
Further, as shown in FIG. 3, the interval between the holding portions 24, 24 holds the inner coating layer 12 of the plastic optical fiber core wire 10 as an example of holding the plastic optical fiber core wire 10 having the dimensions shown in FIG. 1. The value Δ1 is 1.20 mm with respect to the outer diameter of 1.51 mm of the inner coating layer 12 and the outer diameter of the outer coating layer 13 is 2.30 mm at the portion sandwiching the outer coating layer 13. On the other hand, the interval Δ2 is 2.00 mm.

By the way, according to various experiments by the present inventors, the holding force for holding and holding the inner coating layer 12 is more problematic in the conventional optical fiber ferrule than the holding force for holding and holding the outer coating layer 13. It has been found that it has a great influence on prevention of pistoning.
More specifically, when the holding force σa for holding and holding the inner coating layer 12 is larger than the holding force σb for holding and holding the outer coating layer 13 portion, the pistoning phenomenon is more reliably performed over a long period of time. It turns out that it can be prevented.

Therefore, in order to make the holding force σa larger than the holding force σb, as described above, in the distances Δ1 and Δ2 of the holding portions with respect to the inner coating layer 12 and the outer coating layer 13, the outer diameter of the opposite side to be held is Relatively, the interval between the portions sandwiching the inner coating layer 12 was made narrower, and the length L1 of the portion sandwiching the inner coating layer 12 was made longer than the length L2 of the portion sandwiching the outer coating layer 13.
In this example, the difference between the outer diameter of each part and Δ1 and Δ2 (hereinafter referred to as caulking amount) is 0.31 mm in the inner covering layer 12 part and 0.30 mm in the part sandwiching the outer covering layer 13. The amount of caulking at the inner covering layer 12 is slightly increased.

  In this embodiment, when the length of the optical fiber fixing member 23 is 6.5 mm under the conditions of Δ1 and Δ2 described above, L1 is 4.5 mm and L2 is 1.5 mm. That is, the holding force of the plastic optical fiber core wire 10 by the optical fiber ferrule body 20 is sufficient in the vicinity of L1: L2 = 3: 1, and the plastic optical fiber core wire 10 is bent at the mouth of the optical fiber ferrule body 20 to reduce transmission loss. The measured value gave no problem.

  As a method for increasing the holding force σa for holding and holding the inner coating layer 12 to be larger than the holding force σb for holding and holding the outer coating layer 13 portion, for example, the inner coating layer 12 and the outer coating layer 13 If the mechanical characteristics are substantially the same, the above-described Δ1 and Δ2 are adjusted, and the inner coating layer 12 and the outer coating layer 13 are caulked by the optical fiber fixing member 23, respectively, and the inner coating layer 12 side is the outer side. What is necessary is just to make it larger than the coating layer 13 side. In other words, what is necessary is just to bite the inner part of the clamping part 24 into the inner coating layer 12 more than the outer coating layer 13.

Incidentally, in this embodiment, the caulking amounts of the inner coating layer 12 and the outer coating layer 13 are preferably adjusted within 0.2 mm to 0.5 mm, and in particular, the caulking amounts are adjusted within a range of 0.25 mm to 0.30 mm. Then, it has been found that the plastic optical fiber core wire 10 can be fixed to the optical fiber ferrule body 20 without damaging the inner plastic optical fiber 11 and increasing transmission loss more than necessary, thereby effectively preventing the pistoning.
Of course, when the mechanical properties such as the size of the plastic optical fiber core 10, the outer diameter of each coating, or the material change, the above-mentioned optimum value also changes. Therefore, for example, when the material of the inner coating layer 12 or the outer coating layer 13 or the material of the optical fiber fixing member 23 is changed, an experiment is performed each time, and Δ1 and Δ2, and L1 and L2 It is necessary to find the optimum value.

  As shown in FIGS. 3 and 5, a gap ε is provided between the length L1 that sandwiches the inner covering layer 12 and the length L2 that sandwiches the outer covering layer 13. Without inserting this gap ε, when the end portion of the outer coating layer 13 hits the innermost part of the portion where Δ2 is between the sandwiching portions 24, 24 of the optical fiber fixing member 23, the inner coating layer 12, the outer When the covering layer 13 is clamped, there is no escape space for the protruding coating, and as a result, the clamping of both portions may not be as expected. Therefore, the clearance ε is provided to create a clearance field for the coating that escapes in the axial direction, so that the inner coating layer 12 and the outer coating layer 13 can be securely clamped. Incidentally, in this example, if at least ε was 0.5 mm or more, it was sufficient as a cover for the coating.

  In this embodiment, as shown in FIGS. 3 and 5, a large number of protrusions 25 are provided on the inner side of the sandwiching 24 for sandwiching the inner coating layer 12, whereas the outer coating layer is provided. Only a pair of protrusions 26 are provided in the portion sandwiching 13. However, in the portion where the protrusions 26 are not provided, both of them are closely fitted so that the entire inner surface fits the surface of the outer coating layer 13, and the outer coating layer 13 is sandwiched and held in this portion to some extent. It is supposed to be.

  In the embodiment shown in FIGS. 2 to 5, the optical fiber fixing member 23 is inserted and fitted into the opening 22 of the optical fiber ferrule body 20 in a tightly fitted state, and basically the optical fiber fixing member 23 is opened from the opening 22. Will not fall out. However, if it is desired to make it more difficult to remove, for example, by providing a concave portion on the inner surface of the opening 22 and providing a convex portion that fits into the concave portion on the optical fiber fixing member 23 side, the optical fiber fixing member 23 is more reliably provided. Cannot be removed from the opening 22.

FIG. 6 is a longitudinal sectional view showing another embodiment of the present invention. 6 shows, unlike the embodiment shown above, a portion that receives the inner coating layer 12 of the plastic optical fiber core wire 10 in a stepped manner on the bottom portion of the opening 22 of the optical fiber ferrule body 20, an outer side A portion for receiving the coating layer 13 is provided, and projections 35 and 36 are provided respectively.
On the other hand, the lower surface of the optical fiber fixing member 23 inserted and fitted into the opening 22 is also stepped corresponding to the bottom surface of the opening 22 of the optical fiber ferrule body 1, and sandwiches the inner coating layer 12. The portion is provided with a protrusion 25 corresponding to the protrusion 35, and the portion sandwiching the outer covering layer 13 is provided with a protrusion 26 corresponding to the protrusion 36.
That is, in this embodiment, unlike the previous embodiment, there is no holding portion 24 having a substantially U-shaped cross section, and simply corresponds to the bottom surface of the opening 22 of the optical fiber ferrule body 20 and the bottom surface of the optical fiber fixing member 23. This is a type in which the portion of the inner coating layer 12 and the portion of the outer coating layer 13 of the plastic optical fiber core wire 10 are sandwiched and held at the same time.

In the two embodiments, the case where a plastic optical fiber core wire is used as the optical fiber core wire 10 is described. However, it goes without saying that a glass optical fiber core wire may be used instead of the plastic optical fiber core wire. Absent.
However, in the case of a plastic optical fiber, there is little risk of breaking the optical fiber even if the holding force is somewhat large. However, in the case of a glass optical fiber, the holding force, that is, the amount of caulking is not much. It is necessary to work while taking care not to enlarge it.

By the way, although the coating applied to the optical fiber core is two layers of the inner coating layer 12 and the outer coating layer 13 in the above embodiment, for example, there may be three coating layers or more.
For example, when the number of coating layers is three and the term “inner coating layer” is used in the present application, it may be a primary coating layer (innermost coating layer) or a secondary coating layer. If the primary coating layer is the inner coating layer 12, the outer coating layer 13 may be a secondary coating layer or a tertiary coating layer (outermost coating layer). That is, it is determined which layer the inner coating layer 12 and the outer coating layer 13 indicate depending on how many coating layers are removed at the tip of the optical fiber core wire and what layer is left as the inner coating layer. In any case, the inner coating layer 12 and the outer coating layer 13 have only a relative meaning to each other, but there is no doubt that the inner coating layer 12 is a coating layer inside the outer coating layer 13.

According to the optical fiber ferrule of the present invention and the method of manufacturing the same as described above, it is difficult to cause pistoning of the optical fiber with respect to the optical fiber ferrule body, and therefore the optical fiber ferrule having high reliability over a long period of time and the method of manufacturing the same Can be provided.
If a plastic optical fiber core is used, this optical fiber ferrule can be manufactured at a lower cost, which is preferable.

It is the cross-sectional view and side view which show an example of the plastic optical fiber core wire in which this invention relates. It is a perspective view which shows one Example of the optical fiber ferrule of this invention. It is the perspective view which abbreviate | omitted the optical fiber ferrule main body in FIG. FIG. 3 is a cross-sectional view of a portion including an optical fiber fixing member in FIG. 2. It is a longitudinal cross-sectional view in FIG. It is a longitudinal cross-sectional view which shows the other Example of this invention. It is a longitudinal cross-sectional view which shows an example of the conventional optical fiber ferrule. It is a cross-sectional view showing an example of a conventional optical fiber ferrule. (A), (b) is a longitudinal cross-sectional view which shows the pistoning phenomenon in the conventional optical fiber ferrule.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Plastic optical fiber core wire 11 Plastic optical fiber 12 Inner coating layer 13 Outer coating layer 20 Optical fiber ferrule main body 21 Optical fiber insertion hole 22 Opening part
23 Optical fiber fixing member 24 Clamping portion 25, 35 Protrusion 26, 36 Protrusion

Claims (8)

  An optical fiber core wire having a plurality of coating layers on an optical fiber ferrule body having an optical fiber insertion hole penetrating from the front end to the rear end, and an outer coating layer in a state where an inner coating layer of a predetermined length is left from the front end Is inserted through the optical fiber insertion hole, and then the optical fiber core is held by sandwiching the portion from which the outer coating layer has been removed and the portion having the outer coating layer, A method of manufacturing an optical fiber ferrule, comprising fixing the optical fiber core wire to the optical fiber ferrule body.   The optical fiber ferrule main body has an opening communicating with the optical fiber insertion hole from the side surface side, and the portion of the optical fiber core wire inserted through the optical fiber insertion hole is removed. Inserting and fitting an optical fiber fixing member having a holding portion for holding and holding the portion having the outer coating layer at the same time, and fixing the optical fiber core wire to the optical fiber ferrule body; The method for manufacturing an optical fiber ferrule according to claim 1, wherein:   The optical fiber fixing member has a substantially U-shaped cross section for holding the optical fiber core wire inserted through the optical fiber insertion hole by sandwiching and holding the portion from which the outer coating layer is removed and the portion having the outer coating layer at the same time. The manufacturing method of the optical fiber ferrule of Claim 2 characterized by the above-mentioned.   The portion of the optical fiber core wire from which the outer coating layer has been removed is sandwiched and held with a holding force σa, and the portion having the outer coating layer is sandwiched and held with a holding force σb smaller than the holding force σa. The manufacturing method of the optical fiber ferrule in any one of Claims 1-3 characterized by the above-mentioned.   The method for manufacturing an optical fiber ferrule according to claim 1, wherein the optical fiber core wire is a plastic optical fiber core wire.   An optical fiber ferrule body having an optical fiber insertion hole penetrating from the front end to the rear end and an opening communicating with the optical fiber insertion hole from the side surface side, and an optical fiber core wire having a plurality of coating layers, An optical fiber core wire that has been removed from the tip while leaving the inner coating layer of a predetermined length and inserted into the optical fiber insertion hole, and the optical fiber insertion hole that is inserted and fitted into the opening. And an optical fiber fixing member having a sandwiching portion that sandwiches and holds the portion of the optical fiber core wire inserted through the portion from which the outer coating layer has been removed and the portion having the outer coating layer. An optical fiber ferrule.   The optical fiber fixing member has a substantially U-shaped cross section for holding the optical fiber core wire inserted through the optical fiber insertion hole by sandwiching and holding the portion from which the outer coating layer is removed and the portion having the outer coating layer at the same time. The optical fiber ferrule according to claim 6, further comprising:   The optical fiber ferrule according to claim 6, wherein the optical fiber core wire is a plastic optical fiber core wire.

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