JPH11287929A - Optical connector plug - Google Patents

Abstract

(57) [Problem] To provide a low-loss, low-cost optical connector plug. SOLUTION: The plug body 1 includes a plug body 1 and a plug frame 1. The plug body 1 has an optical fiber core wire 4 inside a ferrule 3 having a protruding edge portion 6 formed at a rear end, and a tip thereof optically contacts a front surface of the ferrule. The plug frame 2 is exposed and exposed as the surface 4a, and is buried so that the rear end protrudes rearward of the ferrule. The plug frame 2 has a window hole 15 into which the protruding edge portion 6 of the ferrule 3 is fitted so as to be locked. Support plate 9 and engagement plate 10
, A spring receiving block 11 and a spring 12 as constituent members. A support plate 9 is provided on both upper and lower surfaces of the ferrule 3 of the plug body 1, and a protruding edge 6 is provided in the window hole 1 of the support plate 9.
5, the engaging plate 10 and the spring receiving block 11 provided on both side surfaces of the ferrule 3 are sandwiched and fixed at the front and rear ends, and the ferrule protruding edge 6 of the plug body 1 is fixed. The plug body 1 is constantly pressed and urged forward with a spring 12 interposed between the back surface and the spring receiving block 11 to lock the ferrule protruding portion 6 and the front edge 15a of the window hole 15 with each other. .

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to an optical connector plug.

[0002]

2. Description of the Related Art With the spread of the optical subscriber line network in the future, it is required that the terminal equipment of the line network installed in a building be small in size and high in density. In order to meet this demand, recently, an optical connector plug having a plug-in type structure that can be fitted simply by being inserted into a connector housing is commercially available.

This optical connector plug includes a ferrule whose outer shape is formed in a substantially thin quadrangular prism shape. A tape-shaped optical fiber core is provided in the center of the inside of the ferrule, and the tip of the optical fiber is provided as an optical contact surface in front of the ferrule. It is composed of a plug body that is buried such that it is exposed and the rear end extends rearward of the ferrule.

In use, the guide pins are fitted into small holes formed at both ends of the front of the ferrule, and the optical contact surfaces of the guide pins are brought into contact with each other. Connect with plug.

[0005]

However, the above-mentioned conventional optical connector plugs are interconnected by merely abutting the optical contact surfaces in front of the ferrule, so that they are generally 0.2 dB in normal use. A connection with low loss is possible. However, due to lack of connection stability, mechanical properties (tension, bending, attachment / detachment variation)
There is a need for an optical connector plug with higher performance, which is likely to cause problems in terms of initial characteristics (connection loss) and the like.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and is easily assembled, disassembled and disassembled for a plug body (made of ready-made product) consisting only of a ferrule and an optical fiber. Replaceable plug frame,
Provided is a high-performance optical connector plug in which the plug body is configured to be externally urged forward at all times, whereby the connection state is always stable, and there is little problem in mechanical characteristics and initial characteristics. The purpose is to do.

[0007]

In order to achieve the above object, an optical connector plug according to the present invention includes a plug body and a plug frame, and the plug body has a ferrule having a protruding edge formed at a rear end. An optical fiber core is embedded and embedded such that the tip is exposed as an optical contact surface in front of the ferrule and the rear end projects rearward of the ferrule. A pair of support plates having a pair of support plates provided with window holes which can be moved in the direction and are engageable with the front edge so as to be latchable, and a pair of engagement plates and a concave groove for inserting the optical fiber core wire in the center. Are formed as constituent members, and two supporting plates are fitted on the upper and lower surfaces of the ferrule of the plug body, and the protruding edges thereof are fitted into the window holes of the supporting plate. Two engaging plates disposed on the side surface and a spring receiving block having a concave groove so that the optical fiber core wire behind the ferrule is inserted are sandwiched and fixed at the front and rear ends. A spring is interposed between the back surface of the ferrule protrusion and the spring receiving block to constantly press and urge the plug body forward, thereby locking the ferrule protrusion and the front end of the window hole to each other. Features.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. 1 is an exploded perspective view of the present invention, FIG. 2 is a front view of the present invention, FIG. 3 is a plan view of the present invention, and FIG. 4 is a side view of the present invention.

In each of the figures, reference numeral 1 denotes a plug body, and 2 denotes a plug frame externally mounted on the plug body 1. The plug body 1 is mainly composed of a ferrule 3 having an outer shape of a substantially rectangular plate, a tape-shaped optical fiber core 4 at the center of the inside of the ferrule 3, and an optical connector (described later) at the front end of the ferrule. ) Is exposed as an optical contact surface 4 a, and is buried so that the rear end projects rearward of the ferrule 3.

On the front surface of the ferrule 3, guide pins 5 for the optical connector are provided on both sides of the optical contact surface 4a so as to protrude. A protruding edge portion 6 for locking with the plug frame 2 and a covering portion 7 of the optical fiber core wire 4 are sequentially connected, and both sides of the covering portion 7 support springs (described later). Projections 8, 8 are provided to project from each other.

The plug frame 2 includes a pair of metal support plates 9 and 9 and a pair of synthetic resin engagement plates 10.
10 and one spring receiving block 1 made of synthetic resin
1 and 2 coil springs 12, 12, bolt 1
3, 13 and one plate nut 14 are configured as main members.

The support plates 9, 9 are formed in a substantially rectangular shape having substantially the same shape and the same size, and the front edge 6 of the rear end of the ferrule 3 in the plug body 1 moves in the front-rear direction slightly forward of the center. Each of the rectangular windows 15, 15 is opened so as to be able to be engaged with the front edges 15 a, 15 a so as to be lockable.

Further, on both sides of the tip of the support plates 9, 9,
Square notches 16 are formed, and bolt holes 17 are formed on both sides of the rear end.

At the center of the upper and lower ends of the engaging plates 10 and 10, square engaging projections 18 and 18 that can be engaged with the notches 16 and 16 of the supporting plates 9 and 9 project from respective objects. It is.

The upper end surface of the spring receiving block 11 is formed in the same rectangular shape as the rear end portion of the support plates 9 and 9 and is substantially the same size. A concave groove 19 for inserting the optical fiber core wire 4 is formed along the upper and lower sides of the concave groove 19 at the rear end of the block so as to correspond to the bolt holes 17, 17 of the support plates 9, 9, respectively. 20 and 20 are perforated. On the other hand, screw holes 21 are formed on both sides of the plate nut 14 so as to correspond to the bolt holes 17 and 20, respectively.

In the above configuration, the plug A is assembled as follows. First, the support plates 9, 9 are clamped on both upper and lower side surfaces of the ferrule 3 so that the protruding edge portions 6 are fitted into the windows 15, 15 of the support plates 9, 9, respectively. At this time, the engaging plates 10, 10 are notched 16, 1
6, the spring receiving block 11 is interposed so that the bolt holes 20, 20 thereof are aligned with the bolt holes 17, 17, of the support plates 9, 9, and the coil springs 12, 12, Of the ferrule 3 and the spring receiving block 11 by projecting the front end of the ferrule 3 onto the projections 8 and 8 projecting from the rear surface of the protruding edge 6 of the ferrule 3 and abutting the rear end on the front side wall surfaces of the spring receiving block 11. Intervene.

Then, the bolts 13 are inserted into the bolt holes 17 of the two support plates 9 and the bolt holes 20 of the spring receiving block 11, and the ends of the bolts 13 are inserted into the screw holes 21 of the plate nut 14. , 21, the support plates 9, 9 tighten and fix the engagement plates 10, 10 and the spring receiving block 11, and thus, as shown in FIGS. In the frame 2, the front end of the protruding edge 6 of the ferrule 3 and the front end 15 a of the window 15 of the support plates 9 and 9 are mutually locked.

Next, a method of using the plug A configured as described above will be described with reference to FIGS. First, the outline of the configuration of the optical connector B to which the plug A is connected is as follows. The connector body 2 includes a pair of two casings 22, 22, and a connector body 23 in which an optical receptacle section 24, an electric circuit section 25, and an electrical connection section 26 are sequentially connected from top to bottom.
3 in the casings 22 and 22,
Engaging members (not shown) provided on opposed surfaces 2 and 22
Are fitted.

In the optical receptacle 24, a fitting recess 27 for the plug A is opened above one side of the casings 22, 22, and a ferrule 28 for optical connection of the plug A is buried in the bottom of the recess 27. It is configured by disposing the receptacle block 29 described above.

The upper surface of the ferrule 28 is a flat transmitting / receiving section 2 to which the optical contact surface 4a of the plug A is abutted and optically connected.
8a, and small holes 30, 30 for fitting the guide pins 5, 5 of the plug A are formed on both sides thereof.

On both sides of the ferrule 28, when the plug A is fitted, the engaging plate 10 at the front end and the rear end 10
a, a tapered portion 3
Engagement projections 33, 33 formed by 1, 31 and horizontal portions 32, 32 at the lower end thereof are implanted so that a pair of elastic locking pieces 34, 34 projecting from each other are opposed to each other.

The electric circuit section 25 includes a casing 22,
The printed wiring board 35 and an optical / electrical signal conversion module 36 connected to the optical receptacle 24 mounted on the printed wiring board 35 are provided at a substantially central portion of the wiring board 22.

The electric connection part 26 is connected to the casing 2
2 and 22, a terminal block 38 having a large number of contacts 37 connected to the printed wiring board 35 is provided.

In the drawings, reference numeral 39 denotes a slide bar for removing the connector B, and reference numeral 40 denotes a rotary knob for raising the slide bar 39.

In the above-described configuration, in order to connect the plug A to the connector B, as shown in FIGS. 5 and 6, the plug A faces the optical receptacle 24 of the connector B, and The ferrule 3 is fitted into the fitting recess 27 of the optical receptacle 24. Then, the guide pins 5, 5 at the tip of the ferrule 3 are inserted into the small insertion holes 30, 30 of the ferrule 28 located at the bottom of the recess 27, and the optical contact surface 4 a at the front end of the ferrule 3 is transmitted and received on the upper surface of the ferrule 28. Insert until it comes into pressure contact with the portion 28a.

During the insertion of the plug A, the engaging plates 10 and 10 of the plug frame 2 are
As the sliders 4 slide down the tapered portions 31, 31, the locking pieces 34, 34 are gradually pushed and expanded. When the plug A is further inserted, the ferrule 3 is pressed into contact with the other ferrule 28 and slides slightly upward in the plug frame 2 against the spring force of the coil spring 12 so that the protruding edge 6 of the ferrule 3 is moved. To move the window holes 15, 15 of the support plates 9, 9 from the front to the rear, the rear edges 1 of the engagement plates 10, 10
The protruding edge portion 6 of the ferrule 3 also moves backward with respect to 0a.
As a result, after the engagement plates 10, 10 have passed over the engagement projections 33, 33 of the elastic locking pieces 34, 34, the locking pieces 3
When the plates 4 and 34 are elastically restored and closed, the engaging plates 10 and 10 are closed.
The horizontal portions 32, 32 below the engagement projections 33, 33 are respectively locked to the rear end edges 10a, 10a.

In this way, the plug A is optically connected to the optical receptacle 24 of the connector B, and at the same time, is prevented from being pulled out by the locking force of the elastic locking pieces 34, 34. The plug A is removed from the connector B by pushing and expanding the locking pieces 34, 34 using a special tool (not shown).

[0028]

As described above, the optical connector plug according to the present invention comprises the ferrule 3 having the protruding edge 6 at the rear end thereof.
A plug body 1 consisting solely of an optical fiber core 4 whose front end is exposed as an optical contact surface 4a in front of the ferrule 3.
On the other hand, the plug body 2 assembled with the support plates 9 and 9, the engagement plates 10 and 10, the spring receiving block 11 and the springs 12 and 12 as components, and fixed with a fastening material, , 12 so as to always urge forward, the protruding edge 6 of the ferrule 3 is locked by an elastic locking piece provided on the optical receptacle to be connected. Since the optical contact surface 4a of the ferrule 3 is connected to the sending and receiving portions of the optical receptacle in a resilient state, a low-loss connection is always possible, and the mechanical characteristics (tension, bending, attachment / detachment variation) are also reduced. Good results were obtained. Furthermore, the plug body 1 is constructed by simply using the ready-made plug body 1 to cover the plug frame, and the plug frame 2 can be easily assembled. It can be disassembled and replaced, and can be manufactured at low cost.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of the present invention.

FIG. 2 is a front view of the present invention.

FIG. 3 is a side view of the present invention.

FIG. 4 is a bottom view of the present invention.

FIG. 5 is a partially cutaway front view showing a use state of the present invention before connection.

FIG. 6 is a vertical sectional side view of the same.

FIG. 7 is a partially cutaway front view at the time of connection showing a use state of the present invention.

FIG. 8 is a vertical sectional side view of the same.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Plug main body 2 Plug frame 3 Ferrule 4 Optical fiber core wire 4a Optical contact surface 6 Protrusion part 9 Support plate 10 Engagement plate 11 Spring receiving block 12 Spring 15 Window hole 15a Front edge

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Nobuyuki Tanaka 3-19-2 Nishi Shinjuku, Shinjuku-ku, Tokyo Japan Telegraph and Telephone Corporation (72) Inventor Shinichi Sasaki 3-9-1-2 Nishi-Shinjuku, Shinjuku-ku, Tokyo No. Nippon Telegraph and Telephone Corporation (72) Inventor Yasuhiro Ando 3-19-2 Nishishinjuku, Shinjuku-ku, Tokyo Nippon Telegraph and Telephone Corporation

Claims (1)

[Claims] A plug body and a plug frame;
The plug body is embedded with an optical fiber core wire inside the ferrule with a protruding edge formed at the rear end, with the front end exposed as an optical contact surface in front of the ferrule, and the rear end protruding rearward of the ferrule. The plug frame comprises a pair of support plates having a pair of support plates each having a window hole in which a protruding edge portion of the ferrule is movable in the front-rear direction and is engageable with the front end edge. A plywood and a spring receiving block and a spring in which a concave groove for inserting the optical fiber core wire is formed in the center are formed as constituent members, and two supporting plates are provided on both upper and lower surfaces of a ferrule of a plug body, with protruding edges thereof. Are fitted in the window holes of the support plate, and two engagement plates provided on both side surfaces of the ferrule, and a spring receiving block in which a concave groove is arranged so that an optical fiber core wire behind the ferrule is inserted. Before The spring is interposed between the back of the ferrule ridge of the plug body and the spring receiving block, and the plug body is constantly pressed and urged forward to interpose the end of the ferrule. An optical connector plug, wherein front edges of a window hole are locked to each other.