JPH087370Y2 - Optical fiber cable connection member - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Outline] A connection member for an optical fiber cable widely used for signal transmission wiring of various electronic devices, which can suppress connection loss of an optical signal to be transmitted and facilitate connection work. For the purpose of providing a new optical fiber cable connecting member, a sleeve for connecting the optical fiber cable, the sleeve having a cylindrical shape with an inner diameter into which the optical fiber cable can be inserted from both ends, and the outer peripheral surface of the sleeve. A groove-shaped holding portion for holding the optical fiber cable is provided at the center in the connecting direction, and a fixing means for fixing the optical fiber cable inserted into the sleeve is provided for relative positioning on a pair of blocks provided near the holding portion. A male adapter having a locking projection for coupling projecting from the coupling surface is engaged with the locking projection at a position facing the locking projection of the male adapter. And a female adapter having an engaging recess formed therein.

[Industrial application field]

The present invention relates to a connecting member for an optical fiber cable widely used for signal transmission wiring of various electronic devices.

Recently, as the transmission and reception of optical signals has spread and spread, especially as signal transmission in small electronic devices, optical fiber cables made of plastic have come to be widely used for this optical signal transmission, and the optical fiber cables between these optical fiber cables have been widely used. Optical adapters and optical connectors are commonly used for connections. However, due to excess length treatment of optical fiber cables that are wired between devices or within devices, or by changing the wiring route,
Since it is often required to cut and connect the optical fiber cable, there is a need for a new optical fiber cable connecting member that can facilitate the connecting work and reduce the connecting cost.

[Conventional technology]

As shown in FIG. 3, the connection member of the engagement fiber cable which has been widely used in the past is composed of two optical connectors 2 and one optical adapter 3, and the optical connector 2 is a coupling surface with the optical adapter 3. A positioning protrusion 2-1 and a coupling locking protrusion 2-2 are provided on the projection, and a ferrule 2-3 for transmitting an optical signal is projected from the tip end surface of the positioning protrusion 2-1 by a certain length. There is.

Further, a connection portion (not shown) for connecting the ferrule 2-3 and the core wire of the optical fiber cable 1 is formed inside the opposite side of the coupling surface.

The optical adapter 3 is a ferrule 2-3 of the optical connector 2.
Is inserted from both sides and is embedded so as to penetrate through a metal cylindrical sleeve 3-1 that matches the center position of the ferrule 2-3, and the optical connector 2 is placed at a position close to the sleeve 3-1. Engaging portions 3-2 that are inserted into and combined with the stop projections 2-2 are formed on both end surfaces.

Then, the ends of the respective optical fiber cables 1 to be connected are inserted and fixed in the connecting portions of the optical connector 2, and the core wire of the optical fiber cable 1 and the ferrule 2-3 of the optical connector 2 are connected. Then, when the ferrule 2-3 of the optical connector 2 and the locking projection 2-2 are inserted into the sleeve 3-1 and the engaging portion 3-2 of the optical adapter 3, the two optical fiber cables 1 are connected. Is configured.

[Problems to be solved by the device]

A problem with the conventional connecting member for the optical fiber cable described above is that each of them is projected on one end face of the optical connector 2 and is inserted into the sleeve 3-1 of the optical adapter 3 as shown in FIG. The tip of the ferrule 2-3 has an optical reference plane located inside a certain dimension rather than the mechanical reference plane where the inserted ferrules 2-3 come into contact with each other and are positioned. A space is generated between the reference planes. Therefore, since the transmitted light is attenuated in proportion to the square of the facing distance, the connection loss becomes large, and providing a large number of connecting portions by the optical connector 2 and the optical adapter 3 lowers the reliability of the optical transmission. There is a problem.

In addition, there is a problem in that the connection cost rises because it requires careful attention and skill to connect the core wire 1-1 of the optical fiber cable 1 and the ferrule 2-3 of the optical connector 2.

In view of the above problems, it is an object of the present invention to provide a new connecting member for an optical fiber cable that can suppress the connection loss of transmitted optical signals and facilitate the connection work.

[Means for solving the problem]

The present invention is a member for connecting an optical fiber cable, and as shown in FIG. 1, a sleeve 12 formed into a cylindrical shape having an inner diameter into which the optical fiber cable 1 can be inserted from both ends.
And a groove-shaped holding portion 13 for holding the outer peripheral surface of the sleeve 12.
The fixing means 13 for fixing the optical fiber cable 1 inserted in the sleeve 12 is provided with a and 14a at the center in the connecting direction.
b, 14b, a pair of blocks provided in the vicinity of the sandwiching portions 13a, 13b, a male adapter 13 having locking projections 13c for relative positioning and coupling projected from the coupling surface, and a male adapter 13 of the male adapter 13. The female adapter 14 is formed with an engaging recess 14c that engages with the locking projection 13c at a position facing the locking projection 13c.

[Action]

In the present invention, by inserting the tip edges of the optical fiber cables 1 connected from both ends of the cylindrical sleeve 12 and abutting the end faces of the optical fiber cables 1, as shown in FIG. -1 matches and sticks.

Then, the sleeve 12 is fitted into, for example, the holding portion 14a of the female adapter 14, and the respective optical fiber cables 1 each having a tip edge inserted into the sleeve 12 are fixed to the fixed blade 14b.
When the sleeve 12 is extended upward and the locking projection 13c of the male adapter 13 is inserted into the engaging concave portion 14c of the female adapter 14 and coupled, the sleeve 12 is held by the holding portion 13a of the male adapter 13 and the holding portion 14a of the female adapter 14. At the same time as being clamped, the fixed blade 13b of the male adapter 13 and the fixed blade 14b of the female adapter 14 bite into the sheath 1-2 portion of the optical fiber cable 1 and are fixed, so that the connection work of the optical fiber cable is simplified. It is possible to suppress the connection loss of the optical signal transmitted together with it.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 is a perspective view showing an optical fiber cable connecting member according to this embodiment, and FIG. 2 is a sectional view showing an optical fiber cable connecting state according to the present connecting member. In the figure, the same members as those in FIG. 3 are the same. Although the signal is attached, the other 12 is a sleeve for aligning the optical fiber cables to be connected, and 13 and 14 are male adapters and female adapters for fixing the sleeve and the optical fiber cables.

The sleeve 12 is, for example, a metal cylinder formed into a fixed length with an inner diameter into which the optical fiber cable 1 to be connected as shown in FIGS. 1 and 2 can be inserted from both ends.

As shown in FIG. 1, the male adapter 13 and the female adapter 14 have a semi-circular cross-section groove holding portion 13a for holding the outer circumference of the sleeve 12 on the connecting surfaces of a pair of blocks formed in a rectangular shape.
14a is formed at the center of the optical fiber cable 1 in the connecting direction, and a plurality of fixed blades 13b, 14b, which are shaped to bite into the sheath 1-2 of the optical fiber cable 1 connected to both sides in the connecting direction, face each other. To be installed.

A locking projection 13 having a hook-shaped tip for relative positioning and coupling on the central side edge of the coupling surface of this one block.
By projecting c, the male adapter 13 and the female adapter 14 in which the engaging recess 14c that engages with the locking projection 13c is formed at a position facing the locking projection 13c of the other block by molding a synthetic resin. It was formed.

The method of connecting the optical fiber cables using the above members is as shown in FIG. 2, in which the tip edge of the optical fiber cable 1 to be connected is inserted into the cylindrical sleeve 12 and the tip surface of the optical fiber cable 1 is inserted. The opposing core wires 1-1 are brought into close contact with each other by butting. The sleeve 12 into which the optical fiber cable 1 is inserted is fitted into, for example, the holding portion 14a of the female adapter 14, and the optical fiber cable 1 is passed over fixed blades 14b arranged on both sides of the holding member 14a. The female adapter 14 is extended outward from both end faces.

Then, by inserting and coupling the locking projection 13c of the male adapter 13 into the engaging recess 14c of the female adapter 14, the sleeve 12 is sandwiched between the male adapter 13 and the female adapter 14, and each fixed blade 13b, At 14b, insert into the sheath 1-2 of the optical fiber cable 1 and connect.

Further, the space formed at the positions of the respective fixed blades 13b and 14b by coupling the male adapter 13 and the female adapter 14 may be filled with an adhesive to further firmly fix the optical fiber cable 1.

As a result, the connection work of the optical fiber cable is facilitated and the connection loss of the transmitted optical signal can be suppressed low.

[Effect of device]

As is clear from the above description, according to the present invention, there are advantages that the connection loss of the transmitted light can be suppressed to a low level and the connection can be easily performed with an extremely simple structure, which is extremely economical and reliable. It is possible to provide a connecting member for an optical fiber cable, which can be expected to have an effect of improvement.

[Brief description of drawings]

FIG. 1 is a perspective view showing a connecting member of an optical fiber cable according to this embodiment of the present invention, FIG. 2 is a sectional view showing a connecting state of the optical fiber cable by the connecting member, and FIG. 3 is a conventional optical fiber cable. FIG. 4 is a perspective view showing the connecting member of FIG. 4, and FIG. 4 is a cross-sectional view showing the conventional problems. In the figure, 1 is an optical fiber cable, 1-1 is a core wire, 1-2 is a sheath, 12
Is a sleeve, 13 is a male adapter, 13a and 14a are gripping parts, 13b and 1
4b is a fixed blade, 13c is a locking projection, 14 is a female adapter, and 14c is an engaging recess.

Claims (1)

[Scope of utility model registration request] 1. A member for connecting an optical fiber cable, comprising a sleeve (12) formed into a cylindrical shape having an inner diameter into which the optical fiber cable (1) can be inserted from both ends, and an outer peripheral surface of the sleeve (12). A groove-shaped holding portion (13a, 14a) for holding is provided at the center in the connecting direction, and the fixing means (13b, 14b) of the optical fiber cable (1) inserted in the sleeve (12) is held by the holding portion ( 13a, 14a), a male adapter (13) having locking projections (13c) for relative positioning and coupling projecting from the coupling surface on a pair of blocks provided near the male adapter (13). An engaging recess (14c) that engages with the locking projection (13c) at a position facing the locking projection (13c).
And a female adapter (14) in which the optical fiber cable is formed.