JPH04126203U - light ferrule - Google Patents

Abstract

(57) [Summary] [Purpose] Regarding the improvement of optical ferrules, the purpose is to provide an optical ferrule that does not deteriorate optical transmission characteristics and does not cause damage to fiber strands. [Structure] The fiber wire 11 section exposed by peeling off the terminal coating 12 is inserted into the axial center hole 21 of the ferrule 10, and the covered section is inserted into the axial hole 31 of the ferrule 10, and the adhesive 5 is inserted.
In the optical ferrule configured by fixing the optical fiber 1 to the ferrule 10, a metal sleeve 6 whose outer diameter is smaller than the inner diameter of the shaft hole 31 is fitted into the optical fiber portion inserted into the shaft hole 31 of the ferrule 10. configuration.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention relates to improvements in optical ferrules. In optical connectors, optical devices that optically couple optical fibers and lenses, etc. The optical ferrule is placed at the end of the optical fiber to hold the end of the optical fiber straight. It is common to wear a

0002

[Conventional technology]

FIG. 3 is a cross-sectional view of a conventional optical ferrule. In the figure, 1 indicates fiber wire 11 (outer diameter is approximately 125 μm) is an optical fiber protected by a plastic coating 12. Its outer diameter is approximately 0.9mm.

0003 The fiber 11 has a core and a clump that covers the outer periphery of the core and has a refractive index lower than that of the core. It consists of . The optical fiber 1 is made into an optical ferrule by peeling off the coating 12 at its end. The fiber wire 11 is exposed to a desired length.

0004 The cylindrical ferrule 10 attached to the terminal of the optical fiber 1 is It is composed of a tip member 2 and an outer cylinder 3. The ferrule tip member 2 is cylindrical and made of ceramic such as zirconia. At the axis of It is perforated.

[0005] The outer tube 3 has a cylindrical shape made of stainless steel or the like, and its shaft hole 31 is connected to the outside of the optical fiber 1. sufficiently larger than the diameter. Then, a ferrule tip is attached to the end of the shaft hole 31 of this outer cylinder 3. By press-fitting the root part of the material 2, the ferrule tip member 2 and the outer cylinder 3 are integrated. ing.

[0006] As described above, the ferrule 10 is composed of the ferrule tip member 2 and the outer cylinder 3. This means that the outer periphery of the ferrule tip member 2 and the axial center hole 21 can be machined concentrically with high precision. There is an advantage.

[0007] After filling the shaft hole 31 of the ferrule 10 with adhesive 5 such as epoxy resin, attach the optical fiber. Insert the fiber 1 into the ferrule 10 from the outer cylinder 3 side, and insert the fiber 11 into the axial center hole 21. , insert the coating part into the shaft hole 31, and cover the fiber wire 11 with the coating 12 on the ferrule tip member 2. are adhered to the outer cylinder 3, and then the end face of the ferrule tip member 2 is polished to complete the ferrule. The end face of the ferrule tip member 2 and the end face of the fiber wire 11 are made to be on the same plane. I'm raising it.

[0008]

[Problem that the idea aims to solve]

By the way, optical fibers are manufactured for a long time of several kilometers, so immediately after manufacturing, Since it is wound on a reel and stored in that state, it has a curl.

[0009] Therefore, unwind the optical fiber, peel off the coating on the tip, and insert it into the ferrule. Then, as shown in FIG. 3, the covering part is inserted into the shaft hole of the outer cylinder in a curved state, The fiber wire is straightened and inserted into the axial center hole of the ferrule tip member.

0010 Therefore, the base of the coating of the fiber wire will bend locally, There was a problem that optical transmission characteristics deteriorated. In addition, the expansion and contraction of the adhesive due to changes in environmental temperature can cause bending of the fiber wire. There was a risk that stress would be applied to the fiber and the fiber wire would be damaged or broken.

[0011] The present invention was created with these points in mind, and optical transmission characteristics may deteriorate. We aim to provide an optical ferrule that is free from damage and does not cause damage to the fiber wire. The purpose is

0012

[Means to solve the problem] In order to achieve the above object, the present invention provides a terminal coating 12 as illustrated in FIG. Peel off the bare fiber 11 part of the optical fiber 1 and attach it to the axial center of the ferrule 10. Insert the covered portion into the hole 21 and the shaft hole 31 of the ferrule 10, and apply adhesive 5. In the optical ferrule constructed by fixing the optical fiber 1 to the ferrule 10, the axis A metal strip whose outer diameter is smaller than the inner diameter of the shaft hole 31 is attached to the optical fiber 1 portion inserted into the hole 31. It has a structure in which the rib 6 is fitted.

[0013]

[Effect]

As mentioned above, this invention uses a metal sleeve in the part of the optical fiber that is inserted into the ferrule. Since the wire is fitted, the curls are corrected and it becomes straight. therefore, Even when the fiber is inserted into the axial center hole of the ferrule, the base of the coating is straight without any local bending.

[0014] Therefore, the optical transmission characteristics will not deteriorate, and the adhesive will not deteriorate due to changes in environmental temperature. Expansion or contraction may damage or break the fiber. do not have.

[0015]

【Example】

The present invention will be specifically explained below with reference to the drawings. Note that the same information is used throughout all figures. Codes indicate the same objects.

[0016] Figure 1 is a cross-sectional view of an embodiment of the present invention, and Figure 2 is a cross-sectional view showing the present invention in separated form. Ru. In FIG. 1, a cylindrical ferrule 10 includes a ferrule tip member 2 and an outer cylinder 3. The ferrule tip member 2 has a circular shape made of ceramic such as zirconia. It is columnar and has a shaft with an inner diameter slightly larger than the outer diameter of the fiber strand 11 at its axis. The outer cylinder 3 is cylindrical and made of stainless steel, etc., and its axis is The hole 31 is sufficiently larger than the outer diameter of the optical fiber 1.

[0017] Then, press fit the root part of the ferrule tip member 2 into the end of the shaft hole 31 of the outer cylinder 3. , the ferrule tip member 2 and the outer cylinder 3 are integrated. The optical fiber 1 is separated from the length of the ferrule tip member 2 by peeling off the coating 12 from the end. The bare fiber 11 is exposed by a slightly larger length.

[0018] On the other hand, 6 has an inner diameter made of aluminum, stainless steel, copper metal, etc. Metal sleeve with a wall thickness of about 0.5mm and slightly larger than the outer diameter of bar 1 (about 0.9mm) It is.

[0019] The metal sleeve 6 is fitted onto the optical fiber 1, and the bare fiber wire 11 is covered with metal. It is made to protrude from the tip of the sleeve 6. In the optical fiber 1, the portion of the fiber wire 11 from which the coating 12 has been peeled off is the tip of the ferrule. The 6 parts of the metal sleeve are inserted into the axial hole 21 of the material 2, and the 6 parts of the metal sleeve are inserted into the axial hole 31 of the outer cylinder 3. In the inserted state, it is fixed to the ferrule 10 with adhesive 5.

[0020] As mentioned above, the metal sleeve 6 is snugly inserted into the coated part of the optical fiber 1. As a result, the curling of the optical fiber is corrected and the optical fiber becomes straight. However, Therefore, the fiber wire 11 is straight without being locally bent at the base of the coating. It is inserted into the axial center hole 21 in a state of being

[0021] The optical ferrule described above is assembled as shown in FIG. First, the optical fiber 1 is inserted into the metal sleeve 6 and fixed with adhesive, or The metal sleeve 6 is fitted onto the optical fiber 1 by caulking the metal sleeve.

[0022] Meanwhile, the shaft hole 31 of the ferrule 10 is filled with an adhesive 5 such as epoxy resin. the After that, insert the optical fiber 1 into the ferrule 10 from the outer tube 3 side, and insert the fiber 11 into the shaft. Insert the coating part into the core hole 21 and the shaft hole 31, and apply the adhesive 5 to the fiber wire 11, coating 12, and The adhesive 5 is attached to the outer circumference of the metal sleeve 6, and the adhesive 5 is cured in this state. Coating 12 of the fiber wire 11 to the ferrule tip member 2 and fixing the metal sleeve 6 to the outer cylinder 3 It is something to do.

[0023]

[Effect of the idea]

As explained above, the present invention involves fitting a metal sleeve to an optical fiber and Incorporating a fiber into the ferrule deteriorates the optical transmission characteristics of the optical ferrule. Even if the adhesive expands or contracts due to environmental temperature changes, , which has excellent practical properties without damaging or breaking the fiber wire. have an effect.

[Brief explanation of drawings]

[Figure 1] Cross-sectional view of an embodiment of the present invention

[Figure 2] Cross-sectional view showing the present invention in separated form

[Figure 3] Cross-sectional view of conventional example

[Explanation of symbols]

1 optical fiber 2 Ferrule tip member 3 Outer cylinder 5 Adhesive 6 Metal sleeve 10 ferrule 11 Fiber bare wire 12 Coating 21 axial pore, 31 Shaft hole

Claims (1)

[Scope of utility model registration request] [Claim 1] Peel off the end coating (12) and insert the exposed fiber wire (11) into the axial center hole (21) of the ferrule (10).
In an optical ferrule constructed by inserting the coated portions into the shaft holes (31) of the ferrule (10) and fixing the optical fiber (1) to the ferrule (10) with an adhesive (5),
A metal sleeve (6) having an outer diameter smaller than the inner diameter of the shaft hole (31) is fitted onto the optical fiber portion to be inserted into the shaft hole (31) of the ferrule (10). optical ferrule.