Patent
1985-01-16
1988-02-16
Sikes, William L.
350 9621, G02B 636
Patent
active
047251182
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a device for positioning the end of an optical fibre in a sleeve and includes at least three mutually parallel rods, forming between themselves a passage for receiving the fibre end, one end of the rods being intended for accommodation in the sleeve.
BACKGROUND
Such devices, which can be used for contactors, connection means or auxiliary measuring means for optical fibres, are known from DE-B2-2757216 and EP-B1-015046, for example. These known devices are complicated in their construction, however, and are therefore expensive to manufacture.
SUMMARY OF THE INVENTION
The object of the present invention is to provide an apparatus of the kind described above that is easy and inexpensive to manufacture, and that gives a distinct positioning of an optical fibre, irrespective of the fibre diameter.
This is achieved by the device in accordance with the invention in which each rod has first and second flat surfaces intersecting one another along a longitudinal edge, one flat surface of each rod bearing against a flat surface of an adjacent rod such that the longitudinal edges of the rods extend parallel to and are distributed around the axis of symmetry of the passage. The flat surfaces of rods are slidable on one another to vary the size of the passage to accommodate fibres of different diameter. The rods each include a portion inserted into the sleeve which has a third surface forming equal angles with the first and second surfaces of the rod. The sleeve has flat surfaces bearing respectively against corresponding third surfaces of the rods.
BRIEF DESCRIPTION OF THE FIGURES OF THE DRAWING
The invention will now be described in detail below with reference to the accompanying drawing, in which
FIG. 1 is a perspective view of an embodiment of a device in accordance with the invention,
FIG. 2 is an end view of the device in FIG. 1, and
FIG. 3 is an end view of a second embodiment of the device in accordance with the invention.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS
FIG. 1 illustrates an embodiment of a device in accordance with the invention for positioning the end of an optical fibre 1 in a sleeve 10. The illustrated embodiment includes four mutually parallel rods 2, 3, 4 and 5, between themselves forming a passage accommodating the end of the fibre 1, the sleeve 10 accommodating one end of each rod.
Each of the rods 2-5 has two flat surfaces, and in the illustrated embodiment these surfaces meet one another at right-angles along a long edge 6, 7, 8, and 9, as in FIG. 2. In accordance with the invention, one of the two flat surfaces on the respective rod engages against one of the two flat surfaces on a juxtaposed rod such that the long edges 6-9 of the respective rods 2-5 extend parallel to, and distributed around the axis of symmetry of the passage for the fibre 1 formed between the rods.
The rods 2-5 are mutually, displaceable in relation to this axis of symmetry, while gliding against their mutually engaging surfaces for the purpose of changing the size of the passage to enable the accommodation of fibres having different diameters.
The fibre and its surrounding rods may be glued to each other to ensure fixation of the rods and the fibre accommodated between them.
To enable the accommodation of the rods in a single sleeve 10 for different diameters of the fibre 1, the ends of the rods 2-5 intended for insertion in the sleeve 10 are each formed with a third flat surface 11, 12, 13 and 14, which is preferably parallel to the longitudinal edge of the respective rod, in the present case forming an angle 45.degree. relative to both flat surfaces intersecting each other at right-angles, each of which engages against its complementary surface on adjacent rods. The other ends of the rods are formed with a quadratic section in the illustrated embodiment, but may of course be formed in any other suitable way.
In the embodiment illustrated in FIGS. 1 and 2, the ends of the rods 2-5 inserted in the sleeve 10 are formed as identical isosceles right-
REFERENCES:
patent: 4380366 (1983-04-01), Franken et al.
patent: 4391487 (1983-07-01), Melman et al.
patent: 4668045 (1987-05-01), Melman et al.
Healy Brian M.
Sikes William L.
Telefonaktiebolaget LM Ericsson
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