JPS5932973Y2 - Terminal structure of optical fiber connector - Google Patents

Description

[Detailed description of the invention] The present invention is a terminal structure of an optical fiber connector that is used in an optical fiber cable communication system and has a connection mechanism for optically connecting optical fiber cables to each other or to optical fiber cables and other optical devices. Regarding.

Generally, when configuring a compatible and reproducible connection mechanism for connecting optical fiber cables to each other, the core of the optical fiber cable is positioned at a certain position at the end of the optical fiber cable with high precision, It is often used by inserting it into a cylindrical member and aligning the optical axes with high precision by abutting the connecting side and the connected side of the optical fiber cable against each other.

This type of conventional terminal structure has disadvantages in that positioning takes time and highly accurate centering cannot be performed.

Furthermore, as a fixing mechanism for fixing the end portion of an optical fiber cable, a screw fitting mechanism is generally used that is disposed on the outer periphery of a cylindrical end member to which an optical fiber is fixed.

For this reason, when the end surfaces of the terminal cylindrical members to which the optical fibers are fixed are abutted against each other, the end surfaces may be twisted and the core portions of the end surfaces may be damaged.

SUMMARY OF THE INVENTION An object of the present invention is to provide a terminal structure for an optical fiber connector that eliminates the above-mentioned drawbacks and allows the core of an optical fiber cable to be easily and accurately positioned in a certain direction.

A feature of the present invention is that an optical fiber is fixed to a cylindrical terminal member, and a protrusion is provided on a line connecting the center of the core of the optical fiber and the center of the cylindrical terminal member relative to the outer periphery. The present invention is characterized in that rotation of the terminal cylindrical member to which the optical fiber is fixed is suppressed.

Next, the present invention will be explained in detail with reference to the drawings.

FIG. 1 shows an example of a conventional structure.

In the figure, a terminal cylindrical member 11 having a through hole having a diameter slightly larger than the outer diameter of the optical fiber 2 is provided approximately on the central axis.
The optical fiber 2 is inserted into the through hole, and the adhesive 3 is inserted into the gap between the optical fiber 2 and the through hole.

A method of positioning the core center of the optical fiber 2 at the center relative to the outer periphery of the terminal cylindrical member 1 with high precision is to provide a through hole into which the optical fiber 2 can be inserted at the center position relative to the outer periphery of the terminal cylindrical member 1. There are many positioning methods, such as a method of fixing the optical fiber 2 to the member 1 and then cutting the outer periphery of the terminal cylindrical member 1 with reference to the core portion of the optical fiber 2.

When the structure of FIG. 1 is used and the end faces of each other are inserted into the cylindrical member 12 and abutted against each other as shown in FIG. 4, the cylindrical member 1
The end portion rotates within the optical fiber 2 and the core position of the optical fiber 2 changes, and the end cylindrical member 1 rotates and the end surface of the end portion is likely to be scratched, and the core of the optical fiber 2 made of glass may be damaged. There is.

FIGS. 2 and 3 show an embodiment of the present invention.

In FIG. 2, the optical fiber 2 is inserted into the through hole of the terminal cylindrical member 1, which has a through hole slightly larger than the outer diameter of the optical fiber 2, approximately on the central axis, and the gap between the optical fiber 2 and the through hole is The adhesive 3 is inserted.

Further, a protrusion 4 is provided on a line 11 connecting a center 5 with the outer circumference of the terminal cylindrical member 1 as a reference and a center 6 of the core of the optical fiber.

The structure shown in FIG. 3 has a step 8 on the end cylindrical member 1, and
Arrange the cylindrical member 7 with the protrusion 4 on the top, rotate the cylindrical member 7 so that the protrusion 4 is on the line 11, and after determining the position, use the pressing jig 9 on the stage 8 to press the jig in the direction of the arrow 10. This structure positions the cylindrical member 7 at a predetermined position on the end cylindrical member 1 by pressing the tool 9.

Figure 4 shows the escape hole 13 of the protrusion 4 between the ends of the structure of the present invention.
This is an example in which a cylindrical member 12 having a cylindrical member 12 is used.

In this case, the core position direction of the optical fiber 2 fixed to the cylindrical end member 1 is in the same direction on the abutted end surfaces, so
Connection loss due to connection is reduced.

Furthermore, even if the cylindrical end member 1 is rotated, the protrusion 4 hits the side surface of the protrusion relief hole 13 and does not rotate.
Since the end face of the terminal portion does not rotate, damage to the core can be prevented.

FIG. 5 shows a configuration for connecting an optical device and a terminal according to the present invention.

In FIG. 5, an optical device housing 1 has a hole into which the cylindrical end member 1 can be inserted and a relief hole 13 for the protrusion 4.
An optical device 15 fixed to terminal member 4 and terminal member 1 are connected.

As described above, the present invention makes it possible to realize an optical fiber connector terminal structure with excellent compatibility and reproducibility by adopting a simple structure in which a protrusion is provided at a predetermined position on the terminal cylindrical member to which the optical fiber is fixed. can.

[Brief explanation of the drawing]

Figures 1a and b are front and side views of a conventional terminal structure, Figures 2a, 3a and 2b, and Figure 3 are a front and side view of an embodiment of the present invention. 4 is a partial sectional view showing a state in which the terminals of the present invention are inserted into a cylindrical member, and FIG. 5 is a sectional view showing a state in which the terminal of the present invention and an optical device are connected. In the figure, 1...terminal cylindrical member, 2...
...Optical fiber, 3...Adhesive, 4...
・Protrusion, 5... Center when based on the outer circumference of the terminal cylindrical member 1, 6... Center of the core of the optical fiber 2 or center of the through hole of the cylindrical member 1, 7... ...Protrusion 4
A cylindrical member equipped with 8...a step provided on the terminal cylindrical member 1, 9...a pressing tool, 10...
The pressing direction of the pressing tool 9, 11... The line connecting 5 and 6, 12... The cylindrical member, 13... The escape hole for the protrusion 4 provided in the cylindrical member 12.

Claims (2)

[Scope of utility model registration request] (1) In the terminal structure of an optical fiber connector in which an optical fiber is fixed on the central axis of a terminal cylindrical member, the terminal is located on the outer periphery of the terminal cylindrical member and is on a line connecting the center of this outer periphery and the center of the core of the optical fiber. The terminal structure of an optical fiber connector with protrusions arranged on the inside. (2) The terminal structure of an optical fiber connector according to claim (1), wherein the protrusion is formed on a cylindrical member which is caulked and fixed to a part of the outer periphery of the terminal cylindrical member.