JPH0727448Y2 - Optical connector adapter structure - Google Patents

Description

[Detailed Description of the Invention] [Industrial application] The present invention relates to an optical connector adapter for optically connecting optical fibers to each other, and particularly to a plug formed by fixing an end of an optical fiber to a ferrule. The present invention relates to an adapter structure for attaching an adapter for accurately butting each other to a base such as a printed circuit board.

[Conventional technology]

In an optical communication device that converts an electric signal into an optical signal and transmits the optical signal through an optical fiber, an optical connector that optically connects the optical fibers to each other is used to increase the transmission length.

There are various types of optical connectors used in optical communication devices. One of them is a plug formed by fixing the end of an optical fiber to a ferrule and a sleeve for accurately butting the plugs inside the housing. The optical connector may be used by mounting the adapter on a base such as a printed circuit board.

FIG. 3 is a structural plan view of an adapter of an optical connector in which a conventional adapter of this type is attached to a base, FIG. 3 (a) is a plan view, and FIG. 3 (b) is a partial side sectional view.

In the figure, 1 is a printed circuit board as a base, and a plurality of mounting holes 1a for mounting a housing described later are formed at predetermined positions.

Reference numeral 2 denotes a plug. The plug 2 removes the coating material at the end of the optical fiber cord 3 and inserts and exposes the exposed optical fiber into the ferrule 4 on the cylinder, and holds the ferrule 4 so that the tip projects. It is constituted by holding at 5.

Reference numeral 6 denotes an adapter. The adapter 6 is composed of two housings 7 and 8 made of plastic, and each of the two housings 7 and 8 has an elastic sleeve (not shown). The elastic sleeve is the plug 2
The ferrule 4 has an inner diameter slightly smaller than the outer diameter of the ferrule 4 and elastically expands in the radial direction by a slit provided in the axial direction to support the ferrule 4.

Further, the housing 7 has a plug holding portion 7a for inserting and holding the plug 2 and horizontal flanges 7b, 7c on both sides of one end. Similarly, the housing 8 holds the plug 2 as well. In addition to having the inside of the portion 8a, the structure has horizontal collar portions 8b and 8c on both sides at one end.

A semi-circular groove is formed in the center of the front end of each of the collar portions 7b, 7c and 8b, 8c, and the collar portions 7b and 8b are connected to each other.
This groove becomes a circular through hole 9 by butting and 8c as shown in the figure. Then, the housings 7 and 8 are mounted on the printed circuit board 1 through the through holes 9 by a mounting member 10 such as a mounting screw as described below.

That is, the housings 7 and 8 of the adapter 6 are abutted on the opposite end faces so that the plug insertion ports of the plug holding portions 7a and 8a face outward, and the flange portions 7b and 7c and the collar portions 8b and 8b, respectively.
8c is butted and the elastic sleeve (not shown) is inserted and held in the plug holding portions 7a and 8a of the housings 7 and 8. At this time, the abutting end faces of the housings 7 and 8 are fused by heat or ultrasonic waves to increase the fixing strength.

In this way, the flange portions 7b, 7c and the flange portions 8b, 8c are abutted against each other, whereby the groove portions formed in the collar portions 7b, 7c and 8b, 8c are attached to the printed circuit board 1 as the base, respectively. Since it becomes the through hole 9 for mounting the through hole 9, the through hole 9 is formed in the printed circuit board 1 through the mounting hole for mounting the adapter.
Stack on top of 1a.

After that, mounting members 10 such as mounting screws are inserted from the respective through holes 9 side to communicate with the mounting holes 1a of the printed board 1 and fastened to the printed board 1. As a result, the adapter 6 is fixed to the printed board 1.

In this way, the adapter 6 mounted on the printed circuit board 1 by the mounting member via the collar portions 7b, 7c and 8b, 8c
From the plug holding portion 7a of the one housing 7 to the plug 2
By inserting the ferrule 4 into the inside from one end of the elastic sleeve (not shown), and inserting the mating plug 2 from the plug insertion hole 8a of the other housing 8 to insert the ferrule 4 into the elastic sleeve (not shown). The optical fibers can be optically connected to each other by inserting the ferrules 4 from the ends into the inside and abutting the end faces of the ferrules 4 in the elastic sleeve.

[Problems to be solved by the device]

However, the above-mentioned conventional technique has the following problems.

That is, the optical connection between the optical fibers using the optical connector of this kind must be precisely butted to each other at the tip surfaces of the ferrules located at the tips of the plugs.

For this reason, the housings have to be accurately butted to each other, and the housings must be securely fixed.

However, in the conventional example, each housing is fixed to the base by mounting holes such as mounting screws through the through holes formed by abutting the flanges provided on both sides of each housing. In addition, the fixing strength at the abutting surface of each housing depends only on the heat applied to the abutting surface and ultrasonic fusion, and the X direction indicated by the arrow in the figure for each housing. In addition, if a rotating force in the horizontal and vertical directions such as the Y direction or an oblique impact is applied, the fixing position of the housing may be displaced, and it can be said that the fixing strength against these loads is sufficient. There wasn't.

The present invention has been made to solve these problems, and an adapter structure for an optical connector in which an adapter supporting a plug of an optical fiber cord can be securely fixed in order to maintain the reliability of connection of the optical connector. The purpose is to provide.

[Means for Solving the Problems]

In order to achieve the above-mentioned object, the present invention provides a plug holding portion for inserting and holding a plug formed by fixing an end portion of an optical fiber to a ferrule, and an end surface of the plug holding portion opposite to a plug insertion port side. Two housings having horizontal flanges at the bottoms of both sides are accurately butted against each other at their end faces on the side having the flanges.
In the adapter structure of an optical connector mounted on a base by a mounting member via the collar portion, the collar portion is formed so as to overlap each other when the two housings are butted against each other at a butting surface, and a through hole is formed in the butted dowel portion. Is formed, and the through hole is overlapped with the mounting hole of the base so as to be communicated and fastened by the mounting member.

[Operation] According to the present invention having the above-mentioned configuration, the through hole of the flange portion of the housing is positioned on the mounting hole provided on the base,
By passing the mounting member through the holes and fastening the mounting member to the base, the adapter can be fixed in close contact with the base.

Therefore, according to this, even if a force or impact is applied from the horizontal direction or the vertical direction as in the conventional case, stable and secure fixing can be obtained by the flange portions that overlap each other, so that it does not move while moving. It is prevented from getting squeezed, and precision required for connecting the optical fiber cord can be secured.

〔Example〕

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

FIG. 1 is a structural diagram of an adapter showing an embodiment of the present invention.
2A is a plan view, FIG. 2B is a side view, FIG. 2 is a structural view of the adapter shown in a state before the adapter shown in FIG. 1 is assembled, and FIG. (B) is A-
It is an A line sectional view.

In the figure, 1 is a base, 1a is a mounting hole, 2 is a plug, 3
Is an optical fiber cord, 4 is a ferrule, 5 is a holder, 10
Is a mounting member, and these are the same as conventional ones, and are therefore denoted by the same reference numerals, and the description thereof will be omitted.

Reference numeral 11 denotes an adapter according to the present embodiment, which has a plug holding portion 12a for inserting and holding the plug 2, and a housing 12 having a structure in which horizontal collar portions 12b and 12c are provided at lower portions on both sides of one end.
Similarly, the housing 13 having the plug holding portion 13a and the horizontal collar portions 13b and 13c at the lower portions on both sides of one end.
And an elastic sleeve (not shown) which is held in both the plug holding portions 12a and 13a and precisely holds the connection between the plugs 2 inserted into the plug holding portions 12a and 13a.

Here, the collar portions 12a, 12c of the housing 12 and the collar portions 13b, 13c of the housing 13 are provided in different steps so that when the end faces of the housings 12 and 13 are butted, they are vertically overlapped with each other. Overlapping collars 12b and 13b,
And 12c and 13c are provided with through holes 14 which communicate with each other.

Reference numeral 15 denotes a mounting member such as a mounting screw corresponding to the through hole 14. The mounting member 15 may be a combination of a bolt and a nut, and a female screw portion is provided in the mounting hole 1a of the base and is screwed into this. The structure may be such that they match.

The adapter 11 is mounted on the printed circuit board 1 by the mounting member 15 as follows.

That is, first, the housings 12 and 13 are connected to the respective plug holding portions.
By abutting the opposite end faces so that 12a, 13a face outward, the flange portions 12b and 13b, and 12c and 13c are respectively overlapped with each other, and these flange portions 12b and 13b, and
The holes 12c and 13c are aligned so that the through holes 14 are aligned with each other, and an elastic sleeve (not shown) is inserted and held in the plug holders 12a and 13a.

At this time, it is desirable to heat or ultrasonically fuse the abutting end surfaces of the housings 12 and 13 to increase the fixing strength.

As a result, the housings 12 and 13 are integrated by holding the elastic sleeves (not shown) inside the plug holding portions 12a and 13a, so that the adapter 11 composed of these is placed on the printed board 1 and Collar parts 12b, 13 on the mounting 1a
Position the through holes 14 of b and 12c, 13c.

After that, the mounting member 15 is made to communicate with the inside of the through hole 14 from above the collar portions 12b and 13c, and is fastened to the mounting hole 1a of the printed circuit board 1 so as to be fixed to thereby fix the adapter 11 to the printed circuit board 1. Stick it on top and fix.

The adapter mounted on the printed circuit board 1 in this way
In 11, the plug 2 is inserted from one housing 12, the mating plug 2 is inserted from the other housing 13, and the ferrules 4 of each plug 2 are inserted into an elastic sleeve (not shown) so that the end faces The optical fibers are optically connected to each other by butting each other in the elastic sleeve.

In the above-described embodiment, the mounting member for the flange portion of the housing and the printed circuit board is described as being inserted from the through hole side and connected to the mounting hole of the printed circuit board, but the present invention is not limited to this. If the mounting member uses a bolt and a nut, it can be inserted from either side, and the nut may be fastened to the tip protruding on the opposite side.

In addition to these bolts and nuts, you can use eyelets,
Alternatively, a female screw portion may be provided on the inner peripheral surface of the through hole or the mounting hole, and the female screw portion of the mounting member may be screwed and fastened to be fixed.

[Effect of device]

As described above, according to the present invention, the housing having the plug holding portion for inserting and holding the plug of the optical fiber is provided with the flange portion horizontally provided at the lower end of both end surfaces on the opposite side to the plug inserting side. By forming so that they overlap each other when they are abutted at the abutting surface, and forming a through hole in this overlapping collar part, by overlapping this through hole with the mounting hole of the base and connecting it with a mounting member , The adapter can be attached to the base and fixed.

This will ensure that the adapter is securely attached to the base,
Even if a force that rotates in the horizontal direction or the vertical direction or a shock from an oblique direction to the abutting surface is received, the overlapping brim parts are firmly fastened by the mounting member, so that these brim parts The parts reliably prevent the housing from coming off or moving, resulting in unstable adhesion.

Therefore, the holding of the connecting surfaces of both plugs in the plug holding portion that inserts and holds the plug that requires precision is ensured, and a reliable connection can be provided.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a structural diagram of an adapter showing an embodiment of the present invention, FIG. 2 is a structural diagram showing a state before assembly of the adapter shown in FIG. 1, and FIG. It is a structural diagram of the adapter of. 1 ... Printed circuit board, 1a ... Mounting hole 2 ... Plug, 3 ... Optical fiber cord 4 ... Ferrule, 5 ... Holder 11 ... Adapter 12,13 ... Housing 12a, 13a ... Plug holding part 12b , 13b, 13c, 13c …… Collar part 14 …… Through hole, 15 …… Mounting member

Claims (1)

[Scope of utility model registration request] 1. A plug holding portion for inserting and holding a plug formed by fixing an end portion of an optical fiber to a ferrule, and a horizontal collar at a lower end on both sides of an end surface of the plug holding portion opposite to a plug insertion port side. The two housings each having a portion, the end surfaces on the side having the collar portion are butted against each other with high precision,
In the adapter structure of an optical connector which is attached to a base by an attachment member via the collar portion, the collar portion is formed so as to overlap each other when both housings are butted against each other at a butting surface, and a through hole is provided in the overlying collar portion. An optical connector adapter structure in which the through hole is formed, and the through hole is overlapped with the mounting hole of the base and communicated and fastened by a mounting member.