Abstract In the optical connection of telecommunication glass fibres to semiconductors a curable lacquer is used which comprises a polyester-urethane-acrylate or a polyether-urethane-acrylate. The lacquer furthermore comprises a heat- or light-activatable initiator. The refractive index of the cured lacquer is adjusted by the addition of both a reactive diluent which increases the refractive index and a reactive diluent which reduces the refractive index. Said reactive diluents furthermore serve to establish the desired mechanical properties of the lacquer prior to and after curing. The curable lacquer is provided on the glass fibres and/ or on the semiconductor laser, after which they are contacted with each other and are optically aligned. The lacquer is then cured by raising the temperature or by exposure to light.
A method of optically connecting a light conductor to an electro-optical device by means of a curable lacquer, characterised in that the curable lacquer comprises from 40 to 95% by weight of at least one oligomer selected from the group of oligomeric acrylates, which lacquer furthermore comprises from 0.5 to 5% by weight of a heat- or light-acivatable initiator, the refractive index of the lacquer which is reached after curing being adjusted by the addition of from 2 to 30% by weight of a reactive diluent which has a refractive index-increasing influence and from 2 to 30% by weight of a reactive diluent which has a refractive index-reducing influence, said curable lacquer being contacted with the light conductor and the electro-optical device and after mutual positioning of the light conductor and the electro-optical device being cured by means of a rise in the temperature or by exposure to light.
Claim 2
Dependent Claim
24 words
A method as claimed in Claim 1, characterised in that the oligomer is selected from the group formed by polyester-urethane-acrylates and polyether-urethane acrylat s.
Claim 3
Independent Claim
30 words
A method as claimed in Claims 1 and 2, characterised in that the reactive diluent having a refractive index-increasing influence is selected from the group formed by N-vinyl-2-pyrrolidone, 2'-oxybenzophenone-2-ethoxy-ethyl- acrylate.
Claim 4
Independent Claim
25 words
A method as claimed in Claims 1 and 2, characterised in that the reactive diluent having a refractive index-reducing influence is 2-ethoxy-ethyl-acrylate or 2'- ethoxy-2-ethoxy-ethyl-acrylate.
Claim 5
Independent Claim
30 words
A method as claimed in any of Claims 1 to 4, characterised in that the initiator is azobsisobutyronitrile and that curing is carried out by a rise in the temperature.
Claim 6
Independent Claim
29 words
A method as claimed in any of Claims 1 to 4, characterised in that the initiator is α, α-dimethoxy-α-phenyl-acetophenone and curing is carried out by exposure to UV light.
Claim 7
Independent Claim
38 words
A method as claimed in any of Claims 1 to 6, characterised in that the oligomer is a polyester-urethane-acrylate shown in Fig. 1, in which m is on an average 2.6 and n is on an average 8.
Claim 8
Independent Claim
52 words
A method as claimed in any of Claims 1 to 6, characterised in that the ologomer is a polyether-urethane-acrylate shown in Fig. 2, in which n is on an anverage 75 and in which the reactive diluent having a refractive index-increasing influence is selected from the group formed by 2'-oxybenzophenone-2-ethoxyethyl-acrylate and 2-phenoxy-ethyl-.acrylate.
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