JPH10319273A - Optical fiber connector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify the treatment of an optical fiber leading-out part, to improve workability at the time of connector assembly and to prevent the failure of optical fibers by providing plural pieces of plug frames and respective ferrules engaged with the front ends of respective hollow cylinders 2h, 2m with plural pieces of spring members imparting the force of specific directions. SOLUTION: A housing having the plural hollow cylinders 2h, 2m parallel with each other projecting in a direction (x) is mounted at a hollow base body part 3b having the optical fiber cable drawing out port 1 at one point. Plural pieces of the ferrules 7m, 7h and plural pieces of the spring members 9a, 9b are arranged at the front ends of the respective hollow cylinders 2h, 2m. The force of a +x direction is impressed on the respective ferrules 7m, 7h by the spring members 9a, 9b. The plug frames 6a, 6b are put on the hollow cylinders 2h, 2m including the respective ferrules 7m, 7h. Namely the ferrules 7m, 7h are so held in by the plug frames 6a, 6b that the ferrules are supported movably in the -x direction where the ferrules approach the base body part 3b and that the movement in the +x direction reverse therefrom is prohibited.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical fiber cable connector, and more particularly to an SC two-core optical fiber cable connector.

[0002]

2. Description of the Related Art The present applicant has already disclosed optical fiber connectors in Japanese Patent Application Nos. 3-165526 and 3-165.
No. 527, Japanese Patent Application No. 3-165528, Japanese Patent Application No. 3-30
No. 7414, Japanese Patent Application No. 4-126430, and Japanese Patent Application No. 7-233635.

An optical fiber connector is often used as a set of two for input and output for use in a LAN or the like. One of the two-core optical fiber connectors used for such a purpose is an SC two-core optical fiber connector.
The SC 2-core optical fiber connector is formed by simply connecting two SC single-core optical fiber connectors (based on JIS C 5973 "F04 type single-core optical fiber connector").

FIG. 14 shows an enlarged cross section of an SC single-core optical fiber connector. This optical fiber connector is a single-core optical cable connector suitable for a silica-based multi-mode optical fiber, a multi-component multi-mode optical fiber, and a silica-based single-mode optical fiber mainly used for a medium-long distance optical transmission line. .

An optical fiber (core + cladding) 8a of the optical fiber code 8 penetrates through the ferrule 7 and is fixed to the ferrule 7. An element wire 8a and a core wire 8b including a synthetic resin coating thereof are also fixed to the ferrule 7. The ferrule 7 is an inner flange 6e of the plug frame 6.
And the outer flange 7a of the ferrule 7 hits the inner flange 6e, thereby preventing the ferrule 7 from moving rightward. Inner flange 6 of plug frame 6
“e” is substantially at the center between the opening at the front end (right end in the drawing) and the opening at the rear end (left end in the drawing). The distal end of the stop cylinder 2 enters the rear end opening, and the compression coil spring 9 pressed by this distal end pushes the ferrule 7 rightward, thereby causing the outer flange 7a of the ferrule 7 to move inward. Pressing against the flange 6e, the ferrule 7 is constantly provided with a resilient force to the right.

On the outer peripheral surface of the stop cylinder 2, half-moon-shaped retaining projections 4a and 4b formed by cutting flange-shaped projections provided on the outer periphery of the cylinder with grooves parallel to each other are formed. Slit-shaped hole 16 of plug frame 6
a, 16b. As a result, the stop cylinder 2 is connected to the plug frame 6 as one body. The rear end of the stop cylinder 2 serves as a code bush, and forms a code bush 11 with a stop cylinder as a whole. The distal end of the flexible tube 12 is inserted into the code bush 11 with a stop cylinder, and is fixed to the code bush 11 with a screw 17. The rear end of the flexible tube 12 is inserted into one end of a cord bush 19 and fixed with screws 18. The optical fiber cable 8 is inserted into the other end of the cord bush 19, and a resin jacket 8c is provided. It is fixed. The optical fiber core 8 b passes through the inside of the flexible tube 12 and reaches the ferrule 7. Plug frame
A knob 10 made of synthetic resin covers a side peripheral surface of the drum 6. The protrusions 6f and 6g of the plug frame 6 enter the holes of the knob 10, whereby the knob 10 is moved to the plug frame 6.
And one body.

When assembling an optical fiber connector of this type, first, a flexible pipe 12 is inserted and fixed to a code bush 11 with a stop cylinder, and a code bush 19 is connected to the other end of the flexible pipe 12. A flexible tube 12, a code bush 11 with a stop cylinder and a compression coil spring 9
Through in the order given. Then, the optical fiber core 8b is taken out, inserted into the ferrule 7, adhered and fixed, and after fixing, the ferrule end face including the optical fiber core end face is polished. The compression coil spring 9 is housed in the stop cylinder 2 and the ferrule 7 is attached to the stop cylinder 2 by the plug frame 6. The optical fiber jacket 8c is connected to the code bush 19 by inserting the knob 8 into the stop cylinder 2 to complete the assembly of the optical fiber connector.

[0008] Two SC single-core optical fiber connectors are connected in parallel to form an SC-type two-core optical fiber connector. That is, the code bush for connecting the rear ends of the stop cylinders 2 of the two SC single-core optical fiber connectors is doubled to form an SC type two-core optical fiber connector.

There are two types of SC type two-core optical fiber connectors, called F type and H type. That is, the pair of stopper projections 4a and 4b provided on the stop cylinder 2 face the side surface of the stop cylinder 2, and the pair of rotation stopper projections 5a and 5b.
b (not shown) is attached to the upper and lower surfaces of the stop cylinder 2 so as to be opposed to each other in an F-type. On the contrary, a pair of detent protrusions 5a and 5b (not shown) provided on the stop cylinder 2 are provided.
Is opposed to the side surface of the stop cylinder 2, and the pair of retaining projections 4a and 4b are attached to the upper and lower surfaces of the stop cylinder 2 so as to face each other, which is called an H-shape.

[0010]

SUMMARY OF THE INVENTION Conventionally used SC
The two-fiber optical fiber connector has a shape in which two single-fiber SC optical fiber connectors are simply connected.
Two optical fiber cords, one each, are drawn from the rear of the serialized cord bush. The processing of two optical fiber cords separately drawn from the optical fiber connector is complicated, and when a flexible tube covering means for mechanically protecting the two optical fiber cords is applied, Since each flexible pipe is connected to the main flexible pipe through a two-branch joint, the number of work steps is increased and the material cost is increased.

When assembling an optical fiber connector,
The core wire 8b is passed through the flexible pipe 12, the code bush with stop cylinder 11, the stop cylinder 2, and the compression coil spring 9 in this order. Then, a ferrule 7 is adhered to the optical fiber core with these parts retracted, and the end face is polished. Forgetting to pass these parts or retreating many parts increases the weight and may damage the optical fiber during work. In addition, there are cases where it is impossible to perform the polishing operation depending on the equipment used due to the limitation of the work space.

When assembling the optical fiber connector, the setting direction of the F-type and the H-type may be lost and the optical fiber connector may be improperly assembled.

It is a first object of the present invention to simplify the processing of the optical fiber cable lead-out portion of the SC two-core optical fiber connector, and to improve the workability at the time of assembling the connector. A third object is to prevent breakage of an optical fiber.

[0014]

[Means for Solving the Problems]

(1) An optical fiber connector (210, 220) of the present application comprises a hollow base (3a, 3b) having a cable inlet (1) into which an optical fiber cable (12) is inserted, and a base (3a, 3b). ) And a plurality of n parallel hollow cylinders (2h,
2m); an optical fiber cable (8h), each of which passes through the inner space of each hollow cylinder (2h, 2m) of the optical fiber cable (12) drawn into the housing (3). , 8m), a plurality of n ferrules (7
h, 7m); each ferrule (7h, 7m) is movably supported in the −x direction approaching the base portion (3a, 3b), and the movement in the + x direction opposite thereto is restrained. Is a plurality of plug frames (6a, 6b) engaged with the tip of each hollow cylinder (2h, 2m); and each applies a force in the + x direction to each ferrule (7h, 7m). A plurality of n spring members (9a, 9b);

According to this, an optical fiber cable outlet
A housing (3) having a plurality of n parallel hollow cylinders (2h, 2m) projecting in the x direction is attached to the hollow base (3a, 3b) where (1) is located at one place. A plurality of n ferrules (7m, 7h) and a plurality of n spring members (9a, 9b) are arranged at the tip of each hollow cylinder (2m, 2h), and each ferrule is provided by a spring member (9a, 9b). −
(7h, 7m) in the + x direction. Each ferrule (7h, 7
m) in a hollow cylinder (2m, 2h) containing a plurality of plug frames (6
m, 6h). That is, Ferrule (7
m, 7h) is movably supported in the −x direction approaching the base portion (3a, 3b), and is constrained by the plug frames (6m, 6h) so as to restrict movement in the + x direction, which is opposite thereto. See in. Each ferrule (7
h, 7m), the optical fiber cords (8m, 8h)
(2h, 2m) and the internal space of the housing (3), and are drawn out from one cable outlet (1) as an optical fiber cable (12). That is, the processing at the outlet of the optical fiber cable (12) is reduced from the conventional two places to one place, so that the processing at the outlet is simplified.

The symbols and the like in parentheses indicate the corresponding elements and the like of the embodiments of the invention shown in the drawings and described later.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION

(2) The housing (3) comprises a lower half (3b) and an upper half (3a) joined on an xy plane including the center line of the hollow cylinder (2h, 2m), and the lower half (3b) The tip of the hollow cylinder (2h, 2m) formed by superposing the upper half (3a) is inside the plug frame (6a, 6b).

According to this, the housing (3) in which each hollow cylinder (2h, 2m) is continuous is divided into upper and lower halves on an xy plane including the center line, and the upper half (3a) and the lower half (3b) The structure is as follows. Each hollow cylinder (2h, 2m) is formed by laminating the upper half (3a) and the lower half (3b), and the tip is a plug frame.
(6a, 6b) is inserted. When connecting the tip of the optical fiber cord (8m, 8h) to the ferrule (7m, 7h), remove the plug frame (6a, 6b) from each hollow cylinder (2h, 2m), and
(3) The work can be divided into an upper half (3a) and a lower half (3b). Optical fiber cord on ferrule (7m, 7h)
After connecting the tip of (8m, 8h), ferrule (7m, 7h), spring member
(9a, 9b) and the optical fiber code (8m, 8h) are housed in the lower half (3b) including the hollow cylinders (2h, 2m) in a half-split state, and the remaining hollow cylinders in the remaining half-split state (2h, 2m) and the upper half (3a) are joined together to assemble the optical fiber connectors (210, 220). The workability at the time of terminal processing of an optical fiber code (8m, 8h) requiring fine work is greatly improved, so that damage of the optical fiber code at the time of assembling the connector can be prevented.

Although the hollow cylinder (2m, 2h) is divided into upper and lower parts, the strength of the tip becomes weak. However, since the plug frame (6a, 6b) is fitted into the tip part of the hollow cylinder (2m, 2h), the division is made. The extruded tip does not peel off, and the tip strength of the hollow cylinder (2 m, 2 h) can be maintained. In the past, there was no hollow cylinder (2m, 2h) divided into upper and lower parts.

(3) A cable inlet (1) into which an optical fiber cable (12) is inserted, and a plurality of n hollow tube receiving openings (2cr).
A hollow housing (3) comprising a lower half (3c) and an upper half (3d) joined on an xy plane including the center line of these openings (2cr); A plurality n with one end inserted
Hollow tube (2c); optical fiber cables (12) drawn into said housing (3), each of which has an optical fiber code (8h, 8m) passing through the inner space of each hollow tube (2c). A plurality of n ferrules (7h, 7m) each fixed to the tip; each ferrule (7h, 7m) is movable in the -x direction approaching the base (3a, 3b). A plurality of n plug frames (6a, 6b) respectively engaged with the distal end of each hollow cylinder (2c); (7h, 7m), a plurality of n spring members (9a, 9b) for applying a force in the + x direction.

According to this, a hollow housing (3) having one optical fiber cable outlet (1) and a plurality of n hollow tube receiving openings (2cr) is connected to the center line of the opening (2cr). Including x
The lower half (3c) and the upper half (3d) are divided into two parts on the y plane. By inserting one end of the hollow cylinder (2h, 2m) into each opening (2cr) and joining the lower half (3c) and the upper half (3d), the hollow cylinder (2
h, 2m) to the housing (3). That is, the hollow cylinder (2h, 2
m) is detachable from the housing (3). Conventionally, no hollow cylinder has been made detachable from the housing (3). Ferrule (7m, 7h) at the tip of each hollow cylinder (2m, 2h)
And a spring member (9a, 9b), and a force in the + x direction is applied to each ferrule (7h, 7m) by the spring member (9a, 9b). A plug frame (6m, 6h) is placed (covered) on the tip of the hollow cylinder (2h, 2m) containing each ferrule (7h, 7m). That is, the ferrule (7m, 7h) is movably supported in the -x direction approaching the base (3a, 3b), and the plug frame (7m, 7h) is restrained from moving in the + x direction. 6m, 6h). Optical fiber cord connected to a plurality of n ferrules (7h, 7m)
(8m, 8h) is drawn out from one cable outlet (1) through each hollow cylinder (2h, 2m) and the inner space of the housing (3).

(4) A projection on one of the opening (2cr) and the end of the hollow cylinder (2c) inserted therein for restraining the hollow cylinder (2c) from rotating about its central axis. (2cr), the other provided with a groove or opening (2cp) for receiving the projection (2cr),
The optical fiber connector according to claim 3.

(5) The protrusion (2cr) and the groove or opening (2c)
The optical fiber connector according to claim 4, wherein the plurality of p) are distributed at a pitch of 90 ° around the central axis of the hollow cylinder (2c).

According to this, a plurality of n hollow cylinders (2c) are detached from the housing (3) and rotated at a pitch of 90 ° around the center axis to change the relative position and then attached to the housing (3). I can do it. Multiple hollow cylinders from the housing (3)
By detaching (2c) and changing the relative position and then attaching it to the housing (3), conversion between the F-type SC optical fiber connector and the H-type SC optical fiber connector can be performed quickly and easily. The hollow cylinder (2c) and the housing (3) having the same shape can be used for two types of optical fiber connectors (the F type and the H type), so that the manufacturing cost is reduced.

(6) Hollow cylinder (2h, 2m) and plug frame
Knobs (1a) covering the housings (6a, 6b) and connected to the housing (3)
4. The optical fiber connector according to claim 1, further comprising: 4).

According to this, the knob (14) is connected to each hollow cylinder (2m,
2h) and the plug frames (6a, 6b) are covered and connected to the housing (3) to be integrated as a connector. Thus, the optical fiber connector becomes a plug-type optical fiber connector assembly. In this state, it is connected to or separated from the receptacle (adapter) type optical fiber connector.

(7) Hollow cylinder (2h, 2m) and plug frame (6
a, 6b) has a retaining projection (4a to 4d) on one side and a groove or opening (16a to 16d) for receiving the projection on the other side, claim 1, claim 2, claim 3, claim 4, claim 4. The optical fiber connector according to claim 5.

According to this, the hollow cylinder (2m, 2h) has a pair of retaining projections (4a, 4b / 4c,
4d) (or groove or opening for receiving protrusions (16a-16d))
The plug frames (6a, 6b) have grooves or openings (16a-16d) for receiving the projections (or a pair of retaining projections (4).
a, 4b / 4c, 4d)). Therefore, when the plug frame (6m, 6h) is put on the tip of each hollow cylinder (2m, 2h), the retaining projection (4a, 4b / 4c, 4d) and the receiving groove or opening (16a-16d) Are fitted to connect the hollow cylinder (2h, 2m) and the plug frame (6a, 6b).

(8) The optical fiber connector according to claim 7, wherein the center position of the retaining projections (4a, 4b / 4c, 4d) is on an xy plane including the center line of the hollow cylinder (2h, 2m).

(9) The optical fiber connector according to claim 7, wherein the center position of the retaining projection (4a, 4b / 4c, 4d) is on the xz plane including the center line of the hollow cylinder (2h, 2m).

(10) The retaining projections (4a, 4b / 4c, 4d)
10. The optical fiber connector according to claim 7, wherein the outer peripheral shape of the optical fiber connector is rectangular.

Conventionally, the shape of the retaining projection is arc-shaped. However, the rectangular shape is used to prevent the retaining projection from being fitted into the plug frame (6a, 6b) when the projection is arc-shaped. Even if a force that twists the hollow cylinder (2m, 2h) in the rotating direction is applied, the retaining projection (4a,
4b / 4c, 4d) are the retaining holes (16a ~) of the plug frame (6a, 6b).
It does not deviate from 16d).

(11) Hollow cylinder (2h, 2m) and plug frame
One of (6a, 6b) has a detent projection (5a to 5d), and the other has a groove or opening (15a to 15d) for receiving the projection.
Claim 2, Claim 3, Claim 4, Claim 5 or Claim 6
An optical fiber connector as described.

According to this, the hollow cylinder (2h, 2m) has a pair of detent projections (5a, 5a, 2a) extending on the outer circumference thereof in the x direction (axial direction).
5b / 5c, 5d) (or grooves or openings (15a-1
5d)), and the plug frames (6a, 6b) have grooves or openings (15a to 15d) (or a pair of detent protrusions) for receiving the protrusions.
(5a, 5b / 5c, 5d)). Therefore each hollow cylinder (2m, 2h)
When a plurality of plug frames (6m, 6h) are put on the plug, the relative positions of the hollow cylinder (2h, 2m) and the plug frames (6a, 6b) are determined, and they do not rotate with each other. There is no displacement of the coupling position.

(12) The optical fiber connector according to (11), wherein the center position of the detent projections (5a, 5b / 5c, 5d) is on the xz plane including the center line of the hollow cylinder (2h, 2m).

According to this, the detents (5a, 5b / 5c, 5
d) is arranged in the xz plane including the center line of the hollow cylinder (2h, 2m) in the direction divided at the center thereof, that is, above and below the outer circumference of the hollow cylinder (2m, 2h). At this time, the retaining projections (4a, 4b / 4c,
By arranging 4d) in the direction divided into two at the center by the xy plane, that is, on the left and right sides of the outer circumference of the stop cylinder (2m, 2h), an F-type SC two-core optical fiber connector is obtained.

(13) The optical fiber connector according to (11), wherein the center position of the rotation preventing projection (5a, 5b / 5c, 5d) is on an xy plane including the center line of the hollow cylinder (2h, 2m).

According to this, the detents (5a, 5b / 5c, 5
d) is arranged on the xy plane including the center line of the hollow cylinder (2h, 2m) in the direction divided at the center thereof, that is, on the left and right sides of the outer circumference of the hollow cylinder (2m, 2h). At this time, the retaining projections (4a, 4b / 4c,
By arranging 4d) in the direction divided into two at the center by the xz plane, that is, above and below the outer circumference of the stop cylinder (2m, 2h), an H-type SC two-core optical fiber connector is obtained.

Other objects and features of the present invention will become apparent from the following description of embodiments with reference to the drawings.

[0040]

【Example】

First Embodiment FIG. 1 shows an F-type SC two-core optical fiber connector 210 according to a first embodiment of the present invention. Two optical fiber cords 8m and 8h are introduced into the connector through a flexible tube 12 attached to the optical fiber cord outlet 1 of the housing 3 with a stop cylinder, and one is placed inside the plug frame storage part 14a. The other ferrule is connected to a ferrule 7m disposed inside the plug frame accommodating portion 14b. The F-type SC two-core optical fiber connector 210 has a plug frame housing 1
The guide keys 14ak and 14ck are covered with the double knob 14 including the housings 3a and 14b, and the guide keys 14ak and 14ck are mounted on the upper surface of the plug frame storage portions 14a and 14b.
It is provided on the lower surface of the storage units 14a and 14b.

This F-type SC two-core optical fiber connector 21
The optical transmission fiber cord is disconnected by attaching and detaching the plug-frame storage portions 14a and 14b of the "0" to and from the opposite F-type two-core optical fiber adapter (not shown).

H-type SC two-core optical fiber connector 220
(Not shown) has a similar structure, but has a guide key 14a.
k-14dk are at positions rotated by 90 degrees. That is, the guide keys 14ak and 14bk are attached to the side surface of the double knob plug frame storage portion 14a, and the guide keys 14ck and 14dk are attached to the side surface of the double knob plug frame storage portion 14b.
FIG. 2 shows the F-type SC two-core optical fiber connector 210 of FIG.
Is shown in cross section. A flexible pipe 12 is attached to the outlet 1 provided at one end of the housing 3b. Two optical fiber cords 8m and 8h are introduced into the connector via the flexible tube 12, and the ends thereof are connected to a ferrule 7m.
And 7h. The strands of the optical fiber cords 8m and 8h pass through the fine holes provided at the centers of the ferrules 7m and 7h and reach the tip of the ferrule.

FIG. 3 shows the double knob 14 of the F-type SC two-core optical fiber connector 210 shown in FIG. 1, and FIG. 4 shows the F-type SC two-core optical fiber connector 210 with the double knob 14 removed. From these figures, the F-type SC two-core optical fiber connector 210 has a stop cylinder (hollow cylinder) 2m and 2h connected to the housing, and has an integrated housing 3 with a stop cylinder 3 so as to cover the tips of the stop cylinders 2m and 2h. 2 which covers the connected plug frames 6a and 6b, the plug frames 6a and 6b and the stop cylinders 2m and 2h, and is connected to the housing part.
It can be seen that it is constituted by the chain knob 14.

FIG. 5 shows a state in which the plug frames 6a and 6b have been removed from the ends of the stop cylinders 2m and 2h. Ferrules 7m and 7h with optical fiber codes 8m and 8h connected to the ends of stop cylinders 2m and 2h
The ferrules 7m and 7h are sandwiched and fixed between the two by attaching the plug frames 6a and 6b.

When the plug frames 6a and 6b are connected to the ends of the stop cylinders 2m and 2h, the detents 5a provided on the stop cylinders 2m and 2h are used.
In 5d, the stopper grooves 15 for the plug frames 6a and 6b are provided.
a-15d are aligned so that they coincide with each other, and the retaining projections 4a-4
d is the retaining holes 16a-1 of the plug frames 6a and 6b.
The plug frames 6a and 6b are pushed in until they fit into 6d.

FIG. 6A shows the housing 3 with the stop cylinder shown in FIG. 5 in a side view, and FIG.
The cross section of the housing 3 with the stop cylinder as viewed from the line B-6B is shown. The housing 3 with a stop cylinder is vertically divided into two parts on an xy plane including a height (z direction) center line.
Housing 3a with upper stop cylinder (right upper stop cylinder 2ma and left upper stop cylinder 2ha
And a housing 3b with a lower stop cylinder (including a right lower stop cylinder 2mb and a left lower stop cylinder 2hb).

The division surface is not necessarily limited to the above-mentioned plane, and a predetermined curved surface may be selected. Upper housing 3a and lower housing 3b (and upper stop cylinder 2ma / 2h)
a and the lower stop cylinder 2mb / 2hb) are integrated by fitting mechanisms 13a to 13f. FIG. 7A shows a cross section of the fitting mechanisms 13c and 13d shown by the line 7A-7A in FIG. The elastic claw 13cn fixed to the lower housing 3b is
a hook 13dn having elasticity fixed on the lower housing 3b and hooked on the receiver 13dr provided on the upper housing 3a, and hooked on the receiver 13dr provided on the upper housing 3a.
And the lower housing 3b are fitted together.
The fitting mechanisms 13e and 13f have the same structure, but the fitting mechanisms 13a and 13b are structured such that pins provided in the upper housing 3a are inserted into receiving holes provided in the lower housing 3b and fixed by friction (see FIG. 6). reference).

As shown in FIGS. 5 and 6, anti-rotation projections 5a and 5b are provided on upper and lower surfaces of the stop cylinder 2ma / 2mb parallel to the xy plane, and both sides of the stop cylinder 2ma / 2mb orthogonal to the projections 5a and 5b. Retaining projection 4 on the surface
a and 4b are provided. Stop cylinder part 2ha / 2h
b are provided with detents 5c and 5d on the upper and lower surfaces parallel to the xy plane, and a stop cylinder portion 2ha orthogonal to this.
/ 2hb on both sides parallel to the xz plane
c and 4d are provided.

FIG. 7B shows a stop cylinder 2 ma.
/ 2mb and 2ha / 2hb are shown from the front,
The arrangement of the retaining projections 4a to 4d and the rotation preventing projections 5a to 5d is shown. As described above, the housing 3 with a stop cylinder has the upper housing 3a and the lower housing 3b, the left upper stop cylinder 2ha and the left lower stop cylinder 2hb, and the right upper stop cylinder 2ma and the right in the xy plane including the center of the height (z direction). Since the lower stop cylinder is divided into 2 mb, the retaining projections 4 a to 4
d is also vertically divided by the plane.

As described above, the housing 3 with the stop cylinder
Are vertically divided, and the fitting mechanisms 13a to 13
Although integrated by f, it is easy to separate vertically at the tip of the stop cylinder. However, the distal end of the stop cylinder is not disassembled because it fits into the plug frames 6a and 6b to suppress the surroundings.

FIG. 7C shows the upper housing 3a and the lower housing 3b from behind, and a flexible tube 12 is attached to the optical fiber outlet 1. FIG. Two optical fiber cords 8b pass through the flexible tube in the x direction.

FIG. 8 shows the F type S viewed from the line 8A-8A in FIG.
4 shows a side cross section of the C2-core optical fiber connector 210. Optical fiber code 8h introduced through flexible tube 12
Are the housings 3a and 3b and the stop cylinder 2h
The ferrule 7h is adhered to the ferrule 7h in a state where the wire 8hc passes through the center hole of the ferrule 7h and reaches the front end face through the inner space of a, 2hb to the ferrule 7h. Strand 8hc
The tip of the ferrule 7h including the tip of the above is polished, and the light is transmitted by abutting against the ferrule of an F-type two-core optical fiber adapter (not shown).

The ferrule 7h passes through the center hole of the inner flange 6bf of the plug frame 6b, and the outer flange 7hf of the ferrule 7h contacts the inner flange 6bf. This prevents the ferrule 7h from moving leftward. The front ends of the stop cylinders 2ha and 2hb enter the rear end opening of the inner flange 6bf of the plug frame 6. A plate-shaped anti-rotation protrusion 5c extending in the x direction is formed on the outer peripheral upper surface of the stop cylinder 2ha, and a plate-shaped anti-rotation protrusion 5d is similarly formed on the outer peripheral lower surface of the stop cylinder 2hb. They are fitted in the detent grooves 15c and 15d. The compression coil spring 9b pressed by the ends of the stop cylinders 2ha and 2hb is connected to the ferrule 7h.
In the + x direction, whereby the outer flange 7hf of the ferrule 7h is pressed against the inner flange 6bf, and the ferrule 7h is constantly pressed in the + x direction.

On the outer peripheral surface of the stop cylinder 2ha in the y direction, arc-shaped retaining projections 4c and 4d are provided, each of which has a slit-like hole 16c, 16c of the plug frame 6b.
16d (not shown). As a result, the stop cylinders 2ha and 2hb are combined with the plug frame 6b.

The rear end of the stop cylinder 2ha becomes the housing 3a, and the rear end of the stop cylinder 2hb becomes the housing 3b, forming the housing 3 with the stop cylinder as a whole. A flexible pipe 12 is inserted into the optical fiber cord outlet 1 of the housing 3 with a stop cylinder.
Insert and fix the tip. Plug frame 6b (and 6)
a) is covered with a double knob 14 made of synthetic resin, and is connected to the housing 3 with a stop cylinder by a fixing mechanism (not shown).

FIGS. 9 and 10 show a housing portion with a stop cylinder of the H-type SC two-core optical fiber connector 220. FIG. FIG. 9A shows the connector in a plan view.
(B) of FIG. 9 is shown from the side, and (c) of FIG.
3 shows a line section. FIG. 10 shows the stopper projections 4a to 4d and the rotation stopper projection 5 when the stop cylinder portion is viewed from the front.
The arrangement of a to 5d is shown.

A retaining projection 4b is provided on the upper surface of the stop cylinder 2ma, and a retaining projection 4a is provided on the lower surface of the stop cylinder portion 2mb, and a rotation preventing projection 5a is provided on both side surfaces of the stop cylinder portion 2ma / 2mb orthogonal to the projection. And a rotation preventing projection 5b. Similarly, a retaining projection 4d is provided on the upper surface of the stop cylinder portion 2ha parallel to the xy plane.
A stopper projection 4c is provided on the lower surface of the stop cylinder portion 2hb, and a rotation stopper projection 5 is provided on both side surfaces of the stop cylinder portion 2ha / 2hb which is orthogonal to the xz plane.
c and 5d are provided. As described above, the housing 3 with a stop cylinder has an upper housing 3a and a lower housing 3b, a right upper stop cylinder 2ma and a right lower stop cylinder 2mb, and a left upper stop cylinder 2ha and a left lower stop cylinder in an xy plane including a center line in the z direction. Since it is divided into 2 hb, the detents 5a to
5d is also vertically divided by the plane. The stop cylinder portions 2ma / 2mb and 2ha / 2hb, which can be divided into upper and lower portions and include the rotation preventing protrusions 5a to 5d, are inserted into the plug frames 6a and 6b.

FIG. 11 shows a left stop cylinder portion 2h including the detents 5c and 5d which can be divided into upper and lower parts.
The relationship of the plug frame 6b is shown. When the left stop cylinder portion 2h is inserted into the plug frame 6b, the rotation preventing projections 5c and 5d become the rotation preventing groove 15 of the plug frame 6b.
c, 15d, and the retaining projections 4c, 4d are fitted into the retaining grooves 16c, 16d of the plug frame 6b. Therefore, the fitted stop cylinder portion 2ha / 2hb is not disassembled because its surroundings are suppressed by the plug frame 6b. The same applies to the relationship between the right stop cylinder 2m and the plug frame 6a.

Another structure is the F-type SC2 shown in FIGS.
This is the same as the housing part with the stop cylinder of the optical fiber connector 210. The difference between the F-type SC two-core optical fiber connector 210 and the H-type SC two-core optical fiber connector 220 is only that the positions of the retaining projections 4a to 4d and the positions of the detent projections 5c and 5d are interchanged.

In a conventional SC two-core optical fiber connector, F
Regardless of the type or H type, two single-core optical fiber connectors were simply connected and used, so that two optical fibers were drawn from each of the outlets, that is, two outlets. On the other hand, in the present invention, two optical fibers are drawn out from one outlet in both the F type and the H type. As a result, the handling becomes easy and the required space is reduced. Also, only two branch pipes (flexible pipes) used by each optical fiber connector are required, and the material including the branch joint can be omitted. Also in the production of optical fiber connectors, the number of manufacturing steps is reduced, and therefore the cost and the construction period are reduced.

Since the housing 3 with the stop cylinder can be divided into upper and lower parts, the assembling process of the housing 3 with the stop cylinder can be performed last. That is, ferrule 7
m, 7h, the core wires 8mc, 8hc at the tip of the optical fiber code.
Then, the tip of the ferrule (optical fiber) is polished in this lightweight and easy-to-handle state, and then can be incorporated into the housing 3 with a stop cylinder. For this reason, the ferrule tip (optical fiber wire) polishing period can be greatly reduced, and the polishing can be performed using a conventional polishing machine, so that no special polishing machine is required.
Also, even if the optical fiber is broken, the operation can be re-executed very easily.

Second Embodiment A second embodiment is directed to an F-type SC two-core optical fiber connector 210 shown in FIGS. 1 to 7 and an H-type SC shown in FIGS. 8 to 11.
In the housing 3a, 3b with a stop cylinder of the two-core optical fiber connector 220, the stop cylinder portion 2m
In this embodiment, a / 2mb and 2ha / 2hb are detachable from the housing part.

FIG. 12A shows a detachable stop cylinder portion 2c. In this embodiment, the stop cylinder is integrated without being divided vertically. The stop cylinder portion 2c is commonly used for all the stop cylinders of the F-type SC two-core optical fiber connector 210 and the H-type SC two-core optical fiber connector 220. Similar to the stop cylinder portion shown in the first embodiment, the stop cylinder portion 2c has detent projections 5a and 5b extending in the x direction parallel to the axis on the outer periphery near the tip, and the detent projections 5a and 5b. The projections 4a and 4b are provided at right angles to each other in the circumferential direction. An insertion portion 2cp having a substantially cross-shaped protrusion is formed at the rear end of the stop cylinder portion 2c, and the vertical center line and the horizontal center line of the cross-shaped protrusion are orthogonal to each other. A retaining flange 2cf is attached to the end face of the insertion portion 2cp.

FIG. 12 (b) shows a stop cylinder 2c.
An enlarged view of the upper housing 3c and the lower housing 3d having the receiving portion 2cr of the insertion portion is shown. Upper housing 3
receiving part 2cr when the lower housing 3d matches the lower housing 3d
Is formed. Upper housing 3c and lower housing 3
The insertion part 2 of the stop cylinder part 2c with the
The cp is inserted and fitted with the receiving part 2cr. The vertical center line of the cross-shaped projection 2cp is parallel to the z-axis, and the horizontal center line is parallel to the y-axis. Therefore, the stop cylinder 2c can be attached to the housing 3 at four different positions every 90 degrees on the z axis and the y axis. For example, when the position of the stop cylinder 2c shown in FIG. 12 is the 0-degree position, and the stop cylinder 2c rotates clockwise by 90 degrees, the 0-degree position and 1
At the 80-degree position, the detents 5a and 5b are parallel to the xy plane and the detents 4a and 4b are parallel to the xz plane. Therefore, the F-shape is used together with the other stop cylinder and housing arranged in the same direction. The SC two-core optical fiber connector 210 is formed. Stop cylinder 2c
At the 90-degree position and at the 270-degree position, the rotation-preventing projections 5a and 5b are parallel to the xz plane.
Since a and 4b are parallel to the xy plane, the H-type SC two-core optical fiber connector 220 is formed together with the other stop cylinder portion and the housing portion arranged in the same direction.

The structure of the housing part except for the stop cylinder part is the same as that of FIGS. 2 to 4 and is divided into two parts by the xy plane including the height (z direction) center line.
It is unified by c-13f. The structure of other parts is the same as in the first embodiment.

Although it is excellent to manufacture the stop cylinder unit and the housing unit integrally in mass production,
In the case of small-volume production, it is more advantageous to manufacture the stop cylinder part and the housing part separately as in this embodiment, and adjust the mounting direction of the stop cylinder part to make an F-type or H-type SC two-core optical fiber connector. It is. Thereby, the stop cylinder portion and the housing portion can be used for both the F type and the H type.

Third Embodiment The stop cylinders 2m, 2h and 2c described above are similar to those shown in FIG.
As shown in FIG. 1 (a), there were provided retaining projections 4a to 4d whose outer peripheral shape was an arc shape. That is, when forming the retaining projections, it is convenient to cut both ends of the disc formed in the shape of a sword in parallel, so that the shape becomes an arc shape. Therefore, even if the retaining projections 4a to 4d of the stop cylinder portions 2m and 2h are once housed in the retaining holes 16a to 16d of the plug frames 6a and 6b, if the housing is twisted, the pushing force by the coil springs 9a and 9b is exerted. The retaining projections 4a to 4d have retaining holes 16a to
16d, the stop cylinder portions 2m and 2h may come off from the plug frames 6a and 6b.

Therefore, in the present invention, the retaining projections 4a to 4d
The arc-shaped tip of
The holes 6a and 6b are fitted deeply into the retaining holes 16a to 16d. FIG. 13A shows a left stop cylinder portion 2h of the present invention in which the shape of the retaining projections 4c and 4d is rectangular, and FIG. 13B shows the shape viewed from the line BB of FIG. Show. The retaining projections 4a and 4b of the right stop cylinder 2m have a similar shape. When the stop cylinder portion 2h of the present invention is inserted into the plug frame 6b (no change) shown in FIG. 13C, the stoppers 4c and 4d of the stop cylinder portion have raised shoulders so that they cannot be removed. The tensile strength (withdrawal strength) of the stop cylinder is improved without coming off the holes 16c and 16d. The retaining projections 4a and 4b of the right stop cylinder 2m are also rectangular in shape, and have the same effect.

[Brief description of the drawings]

FIG. 1 is an F-type SC two-core optical fiber connector 2 of the present invention.
It is a top view which shows the external appearance of 10.

FIG. 2 is a horizontal sectional view showing a configuration of the F-type SC two-core optical fiber connector 210 shown in FIG. 1 and a connection state of the optical fiber code.

FIG. 3 is a plan view showing a double knob 14 of the F-type SC two-core optical fiber connector 210 shown in FIG.

FIG. 4 is a plan view including a partial cross section showing a state where the double knob 14 is removed from the F-type SC two-core optical fiber connector 210 shown in FIG.

FIG. 5 shows a view from the stop cylinder portions 2m and 2h in FIG.
FIG. 5 is a plan view including a partial cross section showing a state where plug frames 6a and 6b are removed.

6A is a side view of the housing 3 with a stop cylinder shown in FIG. 5, and FIG. 6B is a cross-sectional view taken along line 6B-6B in FIG.

7A is a sectional view taken along line 7A-7A in FIG. 5, and FIG. 7B is a cross-sectional view of the stop cylinder portions 2m and 2h in FIG.
Retaining projections 4a to 4d and rotation preventing projection 5 viewed from the side
It is a front view which shows the position of a-5d, (c) is a rear view of the housing 3 with a stop cylinder shown in FIG.

FIG. 8 is a cross-sectional view showing a configuration of the F-type SC two-core optical fiber connector 210 shown in FIG. 2 and a connection state of the optical fiber code.

FIG. 9A is a plan view showing a housing 3 with a stop cylinder of the H-type SC two-core optical fiber connector,
(B) is a side view thereof, and (c) is a cross-sectional view taken along line CC of (a).

FIG. 10 shows retaining projections 4a to 4d and rotation preventing projections 5a to 5d viewed from the side of the stop cylinders 2m and 2h in FIG.
It is a front view which shows the position of 5d.

FIG. 11 shows a vertically divided stop cylinder 2h, rotation preventing projections 5c and 5d, and retaining projections 4a and 4a of FIG.
4b is a perspective view showing a plug frame 6b into which the plug frame 4b is inserted.

12A is a perspective view showing a stop cylinder 2c having a detachable structure, and FIG. 12B is an enlarged perspective view showing a part of a housing portion 3c, 3d into which the stop cylinder 2c is inserted. .

FIG. 13 (a) is a square retaining protrusion 4c, 4d.
It is a perspective view showing a stop cylinder 2h provided with
(B) is a front view as seen from line BB of (a),
(C) is a perspective view showing the plug frame 6b into which it is inserted.

FIG. 14 is a sectional view showing the structure of an SC single-core optical fiber connector.

[Description of Signs] 1: Optical fiber cord outlet 2: Stop cylinder 2c: Detachable stop cylinder 2cf: Cross projection insertion section flange 2cp: Cross projection insertion section 2cr: Cross projection reception section 2h: Left stop cylinder 2ha: Upper left stop cylinder 2hb: Lower left stop cylinder 2m: Right stop cylinder 2ma: Upper right stop cylinder 2mb: Lower right stop cylinder 3: Housing with stop cylinder 3a: Housing with upper stop cylinder 3b: With lower stop cylinder Housing 3d: Lower housing with cross-shaped projection receiving portion 3m: Housing 4a-4d: Retaining projection 5a-5d: Detent projection 6a, 6b: Plug frame 6e, 6af,
6bf: inner flange 6f, 6g: projection 7a, 7mf,
7hf: Outer flange 7,7m, 7h: Ferrule 8,8m, 8
h: Optical fiber code 8a, 8mc, 8hc: Optical fiber wire 8b: Primary coating of optical fiber code 8c: Secondary coating of optical fiber code 9, 9m, 9h: Coil spring 10: Knob 11: Coding with stop cylinder -Bush 12: Flexible pipes 13a to 13
f: Fitting mechanism 13cn, 13dn: Claw 13cr, 13
dr: receiver 14: double knob 14a, 14b: double knob plug frame storage section 14ak-14dk: guide key 15a-15d: detent groove 16a-16
d: retaining holes 17, 18: screw 19: cord bush 100: SC single-core optical fiber connector 210: F-type SC two-core optical fiber connector 220: H-type SC two-core optical fiber connector

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Teruhiko Sasaki 3-5-1 Tsukiji, Chuo-ku, Tokyo Nippon Steel Welding Industry Co., Ltd.

Claims (13)

[Claims] A housing having a hollow base portion having a cable inlet into which an optical fiber cable is inserted, and a plurality of mutually parallel hollow cylinders continuous with the base portion and projecting in the x direction therefrom. A plurality of optical fiber cables, each of which is fixed to the tip of an optical fiber cable that has passed through the inner space of each hollow cylinder, of the optical fiber cable drawn into the housing.
Each ferrule is moved closer to the base portion by -x
A plurality of plug frames, each of which is engaged with the tip of each hollow cylinder; and each is connected to each ferrule. , A plurality of n spring members for applying a force in the + x direction. 2. The housing comprises a lower half and an upper half joined at an xy plane including a center line of the hollow cylinder, and a tip of the hollow cylinder formed by laminating the lower half and the upper half. The fiber optic connector of claim 1, wherein the portion is in a plug frame. 3. A lower half which has a cable inlet into which an optical fiber cable is inserted, and a plurality of n hollow tube receiving openings, and which is joined by an xy plane including the center line of these openings. A hollow housing made of a half body; a plurality of n hollow cylinders each having one end inserted into each opening; and light passing through the inner space of each of the optical fiber cables drawn into the housing. A plurality of n ferrules, each of which is fixed to the end of the fiber code; each ferrule is movably supported in the -x direction approaching the base portion, and the + x direction opposite thereto is moved in the + x direction. A light comprising: a plurality of n plug frames each of which is engaged with a tip of each hollow cylinder; and a plurality of n spring members each of which applies a force in the + x direction to each ferrule. Fiber connector. 4. A projection for restraining rotation of the hollow cylinder about its central axis, and a groove for receiving the projection on one of the opening and the end of the hollow cylinder inserted therein. 4. The optical fiber connector according to claim 3, wherein an opening is provided. 5. The optical fiber connector according to claim 4, wherein said plurality of protrusions and grooves or openings are distributed at a pitch of 90 ° around the central axis of the hollow cylinder. 6. The optical fiber connector according to claim 1, further comprising: a knob covering the hollow cylinder and the plug frame and coupled to the housing. 7. The hollow cylinder and the plug frame each having a retaining projection on one side and a groove or an opening for receiving the projection on the other side. Or the optical fiber connector according to claim 6. 8. The optical fiber connector according to claim 7, wherein a center position of the retaining projection is on an xy plane including a center line of the hollow cylinder. 9. The optical fiber connector according to claim 7, wherein a central position of the retaining projection is on an xz plane including a center line of the hollow cylinder. 10. The optical fiber connector according to claim 7, wherein an outer peripheral shape of said retaining projection is rectangular. 11. One of the hollow cylinder and the plug frame has a detent projection and the other has a groove or opening for receiving the projection.
The optical fiber connector according to claim 1, claim 2, claim 3, claim 4, claim 5, or claim 6. 12. The optical fiber connector according to claim 11, wherein the central position of the rotation preventing projection is on an xz plane including the center line of the hollow cylinder. 13. The optical fiber connector according to claim 11, wherein a center position of the rotation preventing projection is on an xy plane including a center line of the hollow cylinder.