JP3792887B2 - Optical connector plug - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an optical connector plug.
[0002]
[Prior art]
As the optical subscriber line network spreads and expands in the future, the termination equipment for the line network installed in the building is required to be small and dense. In order to meet this demand, in recent years, an optical connector plug having a plug-in structure that can be fitted only by being inserted into a connector housing is commercially available.
[0003]
This optical connector plug includes a ferrule having an outer shape formed into a substantially thin quadrangular prism shape, a tape-shaped optical fiber core is exposed at the center of the ferrule, and the tip is exposed as an optical contact surface on the front of the ferrule, It is composed of a plug body embedded so that the rear end extends and projects rearward from the ferrule.
[0004]
In use, the optical connector plugs or the connector housing and the optical connector plug are connected by fitting the guide pins into the small holes drilled at both ends of the front face of the ferrule and butting the optical contact surfaces of each other. Connect to each other.
[0005]
[Problems to be solved by the invention]
However, since the conventional optical connector plugs described above are connected to each other simply by abutting the optical contact surfaces on the front side of the ferrule, a low-loss connection of about 0.2 dB is possible during normal use. Certainly, because of lack of stability of connection, problems with mechanical characteristics (tensile, bending, attachment / detachment variation) and initial characteristics (connection loss) are likely to occur, and the appearance of higher performance optical connector plugs is desired. Yes.
[0006]
【the purpose】
The present invention has been made in view of the above-described problems of the prior art, and can be easily assembled, disassembled, and replaced with respect to a plug body (existing product) composed of only a ferrule and an optical fiber core wire. By configuring the plug frame so that the plug body is always energized forward, the connection state is always stable, and high-performance light that causes less problems in mechanical characteristics and initial characteristics. An object is to provide a connector plug.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, an optical connector plug according to the present invention comprises a plug body and a plug frame, and the plug body has an optical fiber core wire inside a ferrule having a protruding edge formed at the rear end thereof, and a tip end thereof. Is exposed as an optical contact surface in front of the ferrule, and the rear end protrudes backward from the ferrule, and the plug frame is configured such that the protruding edge of the ferrule is movable in the front-rear direction and the front end. A spring receiving block and a spring in which a pair of two supporting plates having a window hole fitted to the edge so as to be engageable, a pair of engaging plates, and a concave groove for insertion of the optical fiber core wire are formed in the central portion The two support plates are fitted on the upper and lower surfaces of the ferrule of the plug body, and the projecting edges are fitted in the window holes of the support plate, and the two support plates are arranged on both sides of the ferrule. Engagement And a spring receiving block in which a concave groove is arranged so that the optical fiber core wire behind the ferrule is inserted is fixed by interposing it at the front and rear ends, and the back surface of the ferrule protruding edge portion of the plug body and the spring receiving block A spring is interposed between the plug body and the plug body is always pressed and urged forward, and the ferrule protruding edge and the front edge of the window hole are engaged with each other.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described 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.
[0009]
In each of the drawings, 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 composed of a ferrule 3 whose outer shape is a substantially rectangular plate as a main member, a tape-shaped optical fiber 4 at the center of the ferrule 3, and an optical connector (described later) at the front end of the ferrule. It is exposed as an optical contact surface 4a and embedded so that the rear end protrudes rearward of the ferrule 3.
[0010]
In addition, optical connector guide pins 5 and 5 are provided on the front surface of the ferrule 3 so as to protrude from both sides of the optical contact surface 4a. 2 and a covering portion 7 of the optical fiber core wire 4 are successively arranged, and on both sides of the covering portion 7, protrusions 8 for supporting springs (described later), 8 is provided for each protrusion.
[0011]
The plug frame 2 includes two pairs of metal support plates 9 and 9, two pairs of synthetic resin engagement plates 10 and 10, one synthetic resin spring receiving block 11, and two The coil springs 12 and 12, bolts 13 and 13, and one plate nut 14 are configured as main members.
[0012]
The support plates 9 and 9 are formed in a substantially rectangular shape having the same shape and the same size, and the protruding edge 6 of the rear end of the ferrule 3 in the plug body 1 is movable in the front-rear direction in front of the center or the heel. In addition, rectangular window holes 15 and 15 are respectively opened so as to be fitted to the front end edges 15a and 15a so as to be latched.
[0013]
In addition, square notches 16 and 16 are formed on both sides of the front ends of the support plates 9 and 9, and bolt holes 17 and 17 are formed on both sides of the rear end.
[0014]
The engaging plates 10 and 10 are provided with square engaging projections 18 and 18 projecting from the respective objects at the center portions of the upper and lower ends of the engaging plates 10 and 10 and engageable with the notches 16 and 16 of the support plates 9 and 9.
[0015]
The spring receiving block 11 is formed in a substantially quadrangular shape having the same upper end surface shape as that of the rear end portions of the support plates 9 and 9, and is lighted along the longitudinal direction of the support plates 9 and 9 on the lower surface of the central portion. A concave groove 19 for inserting the fiber core wire 4 is formed. Bolt holes 20, 20 are formed on both 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. Are perforated. On the other hand, screw holes 21 and 21 are formed on both sides of the plate nut 14 so as to correspond to the bolt holes 17 and 20, respectively.
[0016]
In the configuration described above, the plug A is assembled as follows.
First, the support plates 9 and 9 are held on both upper and lower side surfaces of the ferrule 3 so that the protruding edge portions 6 fit into the windows 15 and 15 of the support plates 9 and 9. At this time, the engagement plates 10 and 10 are interposed by engaging the notches 16 and 16 of the support plates 9 and 9, and the spring receiving block 11 is bolted to the support plates 9 and 9 with the bald holes 20 and 20. The coil springs 12, 12 are externally attached to the projections 8, 8 projecting from the rear surface of the projecting edge 6 of the ferrule 3, and the rear ends are spring receiving blocks. 11 is placed between the ferrule 3 and the spring receiving block 11 by abutting against both front wall surfaces.
[0017]
Then, the bolts 13 and 13 are inserted into the bolt holes 17 and 17 of the two support plates 9 and 9 and the bolt holes 20 and 20 of the spring receiving block 11, and their tips are inserted into the screw holes 21 and 21 of the plate nut 14. By screwing, the support plates 9, 9 fasten and fix the engagement plates 10, 10 and the spring receiving block 11. Thus, as shown in FIGS. 2 and 3, the plug body 1 is placed in the plug frame 2. The front end side of the projecting edge 6 of the ferrule 3 and the front end edge 15a of the window 15 of the support plates 9 and 9 are locked together.
[0018]
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.
A pair of casings 22, 22, and a connector body 23 in which an optical receptacle 24, an electric circuit portion 25, and an electrical connection portion 26 are sequentially arranged from the upper side to the lower side, are provided. , 22 and is configured by fitting engagement members (not shown) provided on the opposing surfaces of the casings 22, 22.
[0019]
The optical receptacle 24 includes a receptacle block in which a fitting recess 27 for a plug A is opened above one side of the casings 22 and 22 and a ferrule 28 for optical connection of the plug A is embedded in the bottom of the recess 27. 29 is provided.
[0020]
The upper surface of the ferrule 28 is formed on a flat transmitting / receiving portion 28a to which the optical contact surface 4a of the plug A comes into contact and is optically connected, and the guide pins 5 and 5 of the plug A are smallly inserted on both sides thereof. Holes 30 are formed.
[0021]
Further, on both sides of the ferrule 28, when the plug A is fitted, the tapered portions 31, 31 and the lower ends thereof are formed on the inner surface of the upper end so as to be engaged with the rear end edges 10a, 10a of the front end engaging plates 10, 10. A pair of elastic locking pieces 34, 34 each having an engaging projection 33, 33 formed by the horizontal portions 32, 32 are provided so as to face each other.
[0022]
The electric circuit unit 25 includes a printed wiring board 35 and an optical / electrical signal conversion module 36 that is connected to the optical receptacle unit 24 mounted on the wiring board 35 at a substantially central portion of the casings 22 and 22. Consists of.
[0023]
The electrical connection portion 26 is configured by disposing a terminal block 38 containing a large number of contacts 37... To be connected to the printed wiring board 35 at the lower part of the casings 22 and 22.
[0024]
In the drawings, 39 denotes a slide bar for removing the connector B, and 40 denotes a rotary knob for raising the slide bar 39.
[0025]
In the above configuration, in order to connect the plug A to the connector B, as shown in FIGS. 5 and 6, the plug A faces the upper side of the optical receptacle 24 of the connector B, and then the ferrule 3 of the plug A is attached. The optical receptacle 24 is fitted into the fitting recess 27. Then, the guide pins 5 and 5 at the tip of the ferrule 3 are inserted into the small holes 30 and 30 for inserting 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 / received on the upper surface of the ferrule 28. Insert until it comes into pressure contact with part 28a.
[0026]
In the middle of the insertion of the plug A, as the engaging plates 10 and 10 of the plug frame 2 slide down the tapered portions 31 and 31 of the elastic locking pieces 34 and 34, both the locking pieces 34, 34 is expanded. When the plug A is further inserted, the ferrule 3 presses against the other ferrule 28 and slightly slides upward in the plug frame 2 against the spring force of the coil spring 12, so that the projecting edge 6 of the ferrule 3 Since the window holes 15 and 15 of the support plates 9 and 9 are moved rearward from the front, the projecting edge 6 of the ferrule 3 is also separated rearward from the rear end edge 10a of the engagement plates 10 and 10. As a result, after the engaging plates 10 and 10 get over the engaging protrusions 33 and 33 of the elastic locking pieces 34 and 34, when the locking pieces 34 and 34 are elastically restored and closed, The horizontal portions 32, 32 below the engaging projections 33, 33 are engaged with the rear end edges 10a, 10a.
[0027]
Thus, the plug A is optically connected to the optical receptacle 24 of the connector B, and at the same time, the plug A is prevented from being pulled out by the locking force of the elastic locking pieces 34 and 34. Note that the plug A can be removed from the connector B by expanding the locking pieces 34, 34 using a dedicated tool (not shown).
[0028]
【The invention's effect】
As described above, the optical connector plug according to the present invention includes the ferrule 3 having the protruding edge portion 6 formed at the rear end, and the optical fiber core wire 4 having the front end exposed as the optical contact surface 4a on the front surface of the ferrule 3. A plug frame 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. The plug body 1 is sheathed so as to be always urged forward by springs 12, 12, and the protruding edge 6 of the ferrule 3 is formed by an elastic locking piece provided on the optical receptacle to be connected. Is locked, and the optical contact surface 4a of the ferrule 3 is connected to the optical receptacle sending and receiving port in an elastic state, so that a low-loss connection is possible at all times, and mechanical properties (tensile Bending, removable variation) good results were obtained. Furthermore, since the plug body 1 is configured by simply using the ready-made plug body 1 and the plug body 1 is externally mounted, and the plug frame 2 can be easily assembled, it can be easily and quickly as necessary. 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 before connection showing a use state of the present invention.
FIG. 6 is a vertical side view of the above.
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 Projection edge part 9 Supporting plate 10 Engagement plate 11 Spring receiving block 12 Spring 15 Window hole 15a Front edge

Claims (1)

The plug body has a plug body and a plug frame, and the plug body exposes the optical fiber core wire inside the ferrule having a protruding edge at the rear end, the front end is exposed as an optical contact surface in front of the ferrule, and the rear end is behind the ferrule. The plug frame is constructed by embedding so as to protrude to the front, and the plug frame has a pair of two windows in which the protruding edge of the ferrule is movable in the front-rear direction and has a window hole that can be engaged with the front edge. The support plate, the pair of engagement plates, and the spring receiving block and the spring in which the concave portion for inserting the optical fiber core wire is formed in the central portion are used as the constituent members, and the two support plates are used as the ferrule of the plug body. On both the upper and lower surfaces, the projecting edge portions are fitted into the window holes of the support plate, and the two engagement plates disposed on both side surfaces of the ferrule and the optical fiber core wire behind the ferrule are inserted. Ditch A spring receiving block is placed on the front and rear ends of the plug body, and is fixed by fastening. Further, a spring is interposed between the back of the ferrule protruding edge of the plug body and the spring receiving block, and the plug body is always pressed forward. An optical connector plug characterized in that the ferrule protruding edge and the front edge of the window hole are engaged with each other.

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