JPH0647910U - Optical connector plug - Google Patents

Abstract

(57) [Summary] [Construction] The insertion protrusion 32 and the fiber fixing portion 34 are independent members, and are joined and fixed to each other to form the optical connector plug 30. A pilot fiber 38 is exposed inside the insertion protrusion 32 such that the front end surface is exposed in conformity with the surface of the insertion protrusion 32 and the rear end surface is exposed in conformity with the surface of the insertion protrusion 32 or from this surface. Adhesively fixed in advance so that it is exposed. [Effect] Both ends of the pilot fiber 38 can be easily mirror-polished. Insert protrusion 32 after polishing
Since the optical connector plug is configured by coupling and fixing the fiber fixing portion 34 and the fiber fixing portion 34, the connection loss is further reduced. Even if the adhesive sticks out at both ends when fixing the pilot fiber 38, it is scraped off when polishing both ends, so there is no need to worry about the limitation of the amount of the adhesive used, and the fixing force of the pilot fiber 38 is sufficiently large. can do.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an optical connector plug that is connected to an optical receptacle or an adapter to make an optical connection.

[0002]

[Prior art]

 As shown in FIG. 4, an optical connector plug is usually used to fix an insertion protrusion 12 to be inserted into a counterpart optical connector or adapter and an optical fiber which is integrally provided on the insertion protrusion 12 and connected to the optical connector plug. Fiber fixing portion 14 for

In some of such optical connector plugs, a pilot fiber 18 which is an optical fiber piece or a fiber glass piece is housed inside the insertion protrusion 12. That is, as shown in FIG. 4, the insertion protrusion 12 and the fiber fixing portion 14 integrally formed on the insertion protrusion 12 are provided with a through hole 16 penetrating them. A pilot fiber 18 having one end exposed at the opening and the other end terminating in the through hole 16 is accommodated. The pilot fiber 18 is fixed in the through hole 16 with an adhesive or the like.

Then, the optical fiber core wire 20 is drawn in from the rear end side of the optical connector plug 10 (see arrows in front and rear), and is fixed to the fiber fixing portion 14. The front end surface of the optical fiber 22 is substantially in contact with the rear end of the pilot fiber 18 and is optically connected. Further, since the increase in the connection loss between the pilot fiber 18 and the optical fiber 22 is directly connected to the increase in the connection loss of the optical connector, in order to suppress the connection loss between them, the refractive index matching should be made to this connection portion. In many cases, the structure is such that liquid is injected or the tip of the optical fiber 22 is spherically polished to press it against the end surface of the pilot fiber 18.

[0005]

[Problems to be solved by the device]

 There are the following issues to be solved. (1) In order to reduce the connection loss between the pilot fiber 18 and the optical fiber 22, it is effective to mirror-finish the rear end surface side of the pilot fiber 18. However, since the pilot fiber 18 is an optical fiber piece or a size comparable to this, the diameter is very small (usually 0.5 mm or less), and the material is fragile with glass and the length is about several mm to 10 mm. Therefore, it is generally difficult to polish the end face with the pilot fiber 18 alone. (2) Generally, the pilot fiber 18 is fixed in the through hole 16 with an adhesive. However, when the pilot fiber 18 is attached, the adhesive is likely to protrude to the rear end face side of the pilot fiber 18. Moreover, since the rear end face side of the pilot fiber 18 is recessed in the through hole 16, it is difficult to remove only the adhesive once it protrudes. On the other hand, if the amount of the adhesive is too small, the force for fixing the pilot fiber 18 is insufficient and the pilot fiber 18 may be displaced or come out. Therefore, considerable attention must be paid to the assembly work.

[0006]

[Means for Solving the Problems]

 As shown in FIG. 1, (1) the insertion protrusion 32 is formed as an independent member to provide a means for being fixed to the fiber fixing portion 34, and (2) the inside of the insertion protrusion 32. The one end surface of the pilot fiber 38 accommodated in is exposed in line with the surface of the independent member, and the other end surface is exposed in line with the surface of the independent member, or this surface is exposed. It is characterized in that it is projected and exposed.

The insertion protrusion 32 formed as one member here is usually cylindrical or prismatic in appearance, but may have any shape as long as it can be connected to a mating connector or adapter.

[0008]

【Example】

 1A is a sectional view of the optical connector plug 30 in a disassembled state, FIG. 1B is a sectional view of an assembled state, and FIG. 1C is a sectional view of a state in which the optical fiber core wire 20 is attached. As shown in FIG. 7A, the insertion protrusion 32 and the fiber fixing portion 34 are each formed as an independent member, and can be joined and fixed to each other as shown in FIG.

The insertion protrusion 32 has a cylindrical shape, and a pilot fiber 38, which is an optical fiber piece, is fixed to the center hole with an adhesive. The tip end side of the pilot fiber 38 (see the arrowheads for the front and rear) is exposed in conformity with the surface of the insertion protrusion 32, and the rear end face side protrudes from the right end of the insertion protrusion 32 in FIG. In the assembling procedure, after fixing the pilot fiber 38 to the insertion protrusion 32, both end faces of the pilot fiber 38 are polished. At this time, as shown in FIG. 2, when polishing the end surface of the pilot fiber 38 on the side projecting from the insertion protrusion 32 (the right side in the figure), a cylindrical polishing jig having the same diameter as the insertion protrusion 32. If 40 is fitted and polished, and the polishing jig 40 is removed after the polishing is completed, the polishing becomes easy.

The insertion protrusion 32 is, for example, press-fitted and fixed to the fiber fixing portion 34 (FIG. 1B). At that time, the rear portion of the pilot fiber 38 protruding from the insertion protruding portion 32 enters into the through hole 36 of the fiber fixing portion 34 and reaches the middle thereof. The optical fiber 22 of the optical fiber core wire 20 is inserted from the opposite side of the through hole 36 (right side in the figure) (FIG. 1 (c)), and its end face is located in the through hole 36 after the pilot fiber 38. The end faces are butted and optically connected.

[0011]

[Other Embodiments]

 In the above case, the insertion protrusion 32 and the fiber fixing portion 34 are fixed by press fitting, but as shown in FIG. 3 (a), the insertion protrusion 32 is twisted to form a male 42. The fiber fixing portion 34 may be provided with a female screw portion (not shown) for receiving the male screw, and the fixing may be performed by a screw. Further, fixing with an adhesive is also possible.

Although the rear end side of the pilot fiber 38 is projected from the surface of the insertion protrusion 32, it may be made to coincide with the end face of the insertion protrusion 32 without being protruded as shown in FIG. 3B. . This facilitates polishing of the pilot fiber 38.

[0013]

[Function and effect of the device]

 (1) In the optical connector plug of the present invention, after fixing the pilot fiber 38 to the insertion protrusion 32 so that both ends thereof are exposed, the insertion protrusion 32 having the pilot fiber 38 fixed thereto may be fixed to the fiber fixing portion 34. Therefore, both ends of the pilot fiber 38 can be easily mirror-polished. Therefore, the connection loss of the optical connector plug can be further reduced. (2) The pilot fiber 38 is often fixed with an adhesive. At this time, even if the adhesive squeezes out at both ends of the pilot fiber 38, the squeezed-out adhesive is scraped off during polishing of both ends. The fixing force of the pilot fiber 38 can be sufficiently increased without having to worry about the limitation of the amount of adhesive used.

[Brief description of drawings]

1A is a cross-sectional view of an optical connector plug 30 in a disassembled state, FIG. 1B is a cross-sectional view of an assembled state, and FIG. 1C is a cross-sectional view of a state of being attached to an optical fiber core wire 20.

FIG. 2 is an explanatory view of polishing a pilot fiber 38.

FIG. 3 is an explanatory view of another example of fixing means for the insertion protrusion 32 and the fiber fixing portion 34.

FIG. 4 is an explanatory diagram of a conventional technique.

[Explanation of symbols]

 10,30 Optical connector plug 12,32 Insertion protrusion 14,34 Fiber fixing part 16,36 Through hole 18,38 Pilot fiber 20 Optical fiber core wire 22 Optical fiber 40 Polishing jig 42 Screw

Claims (1)

[Scope of utility model registration request] 1. An optical connector plug to be connected to a mating optical connector or an adapter, wherein the optical connector plug is provided integrally with the inserting projection portion to be inserted into the optical connector or the adapter. And a fiber fixing portion for fixing the optical fiber connected to
In an optical connector plug in which a pilot fiber, which is an optical fiber piece or a fiber glass piece, is housed inside the insertion protrusion, the insertion protrusion is formed as an independent member and fixed to the fiber fixing portion. The pilot fiber accommodated in the insertion protrusion has one end surface exposed to coincide with the surface of the independent member, and the other end surface is exposed to the independent member. An optical connector plug, which is exposed in conformity with the surface of or exposed from the surface.