JP4652631B2 - Ferrule for optical connector and optical connector - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a ferrule for an optical connector and an optical connector used for connecting optical fiber core wires.
[0002]
[Prior art]
As shown in FIG. 5, the optical connector ferrule (hereinafter simply referred to as a ferrule) has an optical fiber insertion hole 1 and a guide pin insertion hole 2 on the end face. When connecting an optical fiber using this ferrule, prepare two ferrules in which the optical fiber is inserted into the optical fiber insertion hole 1, insert the guide pin 3 into the guide pin insertion hole 2 of one ferrule, and both ferrules. 4 is made to approach along the guide pin 3, and the abutting end surfaces 5 of both ferrules are abutted. When the ferrule 4 is approached along the guide pin 3, if dust adheres to the outer peripheral surface of the guide pin 3, the dust may be squeezed and fall to the base portion of the guide pin 3 and accumulate on the butt end surface 5. There is. For this reason, when the ferrule is abutted, a slight gap is generated between the abutting end faces 5, the abutting of the end face of the optical fiber exposed to or projecting from the abutting end face 5 becomes insufficient, and the connection loss increases. To do. In order to prevent the deterioration of the optical connection characteristics, conventionally, the guide pin 3 and the butted end surface 5 are wiped with alcohol to remove dust.
[0003]
[Problems to be solved by the invention]
When connecting optical fibers as described above, there are the following problems.
1. Even if the guide pin 3 is wiped off with alcohol, the guide pin 3 is then held by hand and inserted into the guide pin insertion hole 2, so that dust easily adheres to the guide pin 3.
2. The butt end face 5 must be polished after the optical fiber is attached. In this case, in order to eliminate the influence of dust on the guide pin 3, the optical fiber insertion hole 1 is formed when the outer side portions 6 of the optical fiber insertion hole 1 are scraped down to one step lower than the butt end face 5 as shown in FIG. 6. Only the end face which becomes the butt end face 5 becomes the butt end face 5 and the width of the butt end face 5 becomes narrower. When the abutting end face 5 is polished after the optical fiber is inserted, the outer edge 7 of the abutting end face 5 is easily rounded as shown in FIG. Therefore, in the ferrule 4 in which both outer side portions 6 of the optical fiber insertion hole 1 are one step lower than the butt end surface 5 as shown in FIG. 7, the optical fiber tip surface 8 exposed or protruded from the butt end surface 5 after polishing is When viewed from the side, the outer optical fiber tip 8 is in a state of drawing an arc and does not line up on a straight line. When the butted end surfaces 5 are butted in this state, the outer end surfaces of the optical fibers are not in direct contact with each other as shown in FIG.
[0004]
[Means for Solving the Problems]
The first ferrule for an optical connector of the present invention has a butt end surface, an optical fiber insertion hole is provided in the butt end surface, and a guide pin insertion hole is opened outside the optical fiber insertion hole in the arrangement direction. in the optical connector ferrule provided Te, the guide pin insertion hole opening periphery of the butted end faces, a groove-like recess which is recessed in the axial direction of the butted end faces the guide pin insertion holes than provided, on the outside of the recess, An outer abutting end surface having the same height as the abutting end surface is formed, and the concave portion opens in the same direction as the arrangement direction of the optical fiber insertion holes .
The ferrule for the second optical connector of the present invention has a butt end surface, and an optical fiber insertion hole is provided in the butt end surface, and a guide pin insertion hole is opened outside the optical fiber insertion hole in the arrangement direction. In the ferrule for an optical connector provided in the outer periphery of the guide pin insertion hole opening of the abutting end surface, a groove-like recess that is recessed in the axial direction of the guide pin insertion hole from the abutting end surface is provided. An outer abutting end surface having the same height as the abutting end surface is formed, and the concave portion opens in a direction orthogonal to the arrangement direction of the optical fiber insertion holes.
The optical connector of the present invention uses the first or second ferrule for optical connectors.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
(Embodiment 1)
A first embodiment of an optical connector ferrule of the present invention is shown in FIGS. This optical connector ferrule is made of resin and has a butted end face 5, and the butted end face 5 has two guide pin insertion holes 2 and a large number of optical fibers between the guide pin insertion holes 2 in the width direction. An insertion hole 1 is provided open. Further, on the outer periphery of the opening of the guide pin insertion hole 2 on the abutting end surface 5, a circular concave portion 9 is formed concentrically with the circular recess 9 that is recessed in the axial direction of the guide pin insertion hole 2 from the abutting end surface 5. An outer butt end face 10 having the same height as the butt end face 5 is formed on the outer side. The depth and width of the recess 9 are such that even if dust adhering to the guide pin 3 inserted into the guide pin insertion hole 2 falls on the base of the guide pin 3, it falls into the recess 9 and is accommodated. There is no limitation other than that.
[0006]
(Embodiment 2)
2nd Embodiment of the ferrule for optical connectors of this invention is shown in FIG. This optical connector ferrule basically has the same configuration as that of the optical connector ferrule of FIG. 1 except that the concave portion 9 formed in the outer periphery of the opening of the guide pin insertion hole 2 is made square. The depth and width of the recess 9 are the same as those of the recess 9 of the first embodiment.
[0007]
(Embodiment 3)
3rd Embodiment of the ferrule for optical connectors of this invention is shown in FIG. Similar to the optical connector ferrule of FIG. 1, the optical connector ferrule includes a large number of optical fiber insertion holes 1, butted end surfaces 5, and two guide pin insertion holes 2. Further, a recess 9 that is recessed in the axial direction of the guide pin insertion hole 2 from the abutting end surface 5 is formed in a groove shape on the outer periphery of the opening of the guide pin insertion hole 2 in the abutting end surface 5, and the outside of the recess 9 is abutted The outer butt end face 10 has the same height as the end face 5. In this case, the recess 9 is a groove that opens in the same direction as the arrangement direction of the multiple optical fiber insertion holes 1 (the left-right direction in FIG. 3). The depth and width of the recess 9 are the same as those of the recess 9 of the first embodiment.
[0008]
(Embodiment 4)
A fourth embodiment of the ferrule for optical connector of the present invention is shown in FIGS. This optical connector ferrule is basically the same in configuration as the optical connector ferrule of FIG. 3 except that a groove-like recess 9 formed on the outer periphery of the opening of the guide pin insertion hole 2 is provided with a plurality of optical fibers. That is, the groove is opened in a direction perpendicular to the arrangement direction of the insertion holes 1 (vertical direction in FIG. 4a). The depth and width of the recess 9 are the same as those of the recess 9 of the first embodiment.
[0009]
(Embodiment 5)
The concave portion 9 of the ferrule for an optical connector according to the present invention may be a vertically long or horizontally long rectangle, or may have another shape.
[0010]
【The invention's effect】
In the present invention, since the concave portion recessed in the axial direction of the guide pin insertion hole from the abutting end surface is formed on the outer periphery of the opening portion of the guide pin insertion hole in the abutting end surface, dust falling from the guide pin is accommodated in the concave portion. As a result, it becomes difficult to adhere to or accumulate on the butt end face. For this reason, the butted end faces of the two ferrules for optical connectors are reliably in surface contact with each other, and the exposed end faces of the optical fibers are reliably in contact with each other, and the optical connection characteristics are improved.
[0011]
Furthermore, the present invention has formed an outer butted end face having the same height as the butted end face outside the recess formed in the outer periphery of the opening of the guide pin insertion hole of the butted end face. Only the inner edge of the recess is rounded, and the abutting end face with the optical fiber insertion hole is not rounded. For this reason, the end faces of the optical fibers exposed or protruding from the abutting end faces are aligned in a straight line, and when the abutting end faces are abutted with each other, the end faces of the optical fibers are reliably in contact with each other, and good optical connection characteristics are obtained. It is done.
[Brief description of the drawings]
1A is a perspective view showing a first example of an optical connector ferrule of the present invention, and FIG. 1B is a cross-sectional plan view of the optical connector ferrule of FIG.
FIG. 2 is a perspective view showing a second example of the ferrule for optical connector of the present invention.
FIG. 3 is a perspective view showing a third example of the ferrule for optical connectors of the present invention.
4A is a perspective view showing a fourth example of an optical connector ferrule of the present invention, and FIG. 4B is a cross-sectional plan view of the optical connector ferrule of FIG.
FIG. 5 is a perspective view of a conventional optical connector ferrule with a guide pin inserted therein.
FIG. 6 is a perspective view showing another example of a conventional ferrule for optical connectors.
7 is a cross-sectional plan view after polishing the butted end face of the optical connector ferrule of FIG. 6. FIG.
8 is a cross-sectional plan view of the optical connector ferrule of FIG. 7 in a butted state.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Optical fiber insertion hole 2 Guide pin insertion hole 3 Guide pin 4 Ferrule 5 Butting end surface 9 Recessed part 10 Outer butting end surface

Claims (3)

In the ferrule for an optical connector having an abutting end face, an optical fiber insertion hole is provided in the abutting end face, and a guide pin insertion hole is provided outside the optical fiber insertion hole in the arrangement direction.
Provided on the outer periphery of the guide pin insertion hole opening of the butt end surface is a groove-shaped recess recessed in the axial direction of the guide pin insertion hole from the butt end surface,
An outer butt end surface having the same height as the butt end surface is formed outside the recess,
The ferrule for an optical connector , wherein the concave portion opens in the same direction as the arrangement direction of the optical fiber insertion holes . In the ferrule for an optical connector having an abutting end face, an optical fiber insertion hole is provided in the abutting end face, and a guide pin insertion hole is provided outside the optical fiber insertion hole in the arrangement direction.
Provided on the outer periphery of the guide pin insertion hole opening of the butt end surface is a groove-shaped recess recessed in the axial direction of the guide pin insertion hole from the butt end surface,
An outer butt end surface having the same height as the butt end surface is formed outside the recess,
The ferrule for an optical connector , wherein the concave portion opens in a direction orthogonal to an arrangement direction of the optical fiber insertion holes . An optical connector using the ferrule for an optical connector according to claim 1 .

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