Title:
METHOD OF MAKING A PLASTIC OPTICAL FIBRE, AND A PLASTIC OPTICAL FIBRE
Document Type and Number:
WIPO Patent Application WO1999060426
Kind Code:
A3
Abstract:
The invention relates to a method of making a plastic optical fibre, in which method plastic materials with suitable optical properties are fed into an extrusion apparatus so as to form a multilayer structure where the refractive index decreases gradually in a controlled manner from the inside outwards. The invention also relates to a plastic optical fibre. In order to provide flexible and continuous manufacture and a wideband fibre, the extrusion apparatus consists of at least one multilayer conical extruder unit (1) which produces a product where the layers are formed without weld lines, are symmetrical and adhere well to each other. The number of the layers may also be high.
Inventors:
KIRJAVAINEN KARI (FI)
SUVANTO MARKKU (FI)
HEINONEN JOUNI (CH)
SUVANTO MARKKU (FI)
HEINONEN JOUNI (CH)
Application Number:
PCT/FI1999/000425
Publication Date:
January 13, 2000
Filing Date:
May 17, 1999
Export Citation:
Assignee:
NEXTROM HOLDING SA (CH)
NK CABLES OY (FI)
KIRJAVAINEN KARI (FI)
SUVANTO MARKKU (FI)
HEINONEN JOUNI (CH)
NK CABLES OY (FI)
KIRJAVAINEN KARI (FI)
SUVANTO MARKKU (FI)
HEINONEN JOUNI (CH)
International Classes:
G02B6/028; B29C48/05; B29C48/30; B29D11/00; G02B6/00; B29C48/00; (IPC1-7): G02B6/18
Foreign References:
| US5729645A | 1998-03-17 | |||
| US5235660A | 1993-08-10 | |||
| US5555525A | 1996-09-10 |
Other References:
PATENT ABSTRACTS OF JAPAN vol. 16, no. 241
PATENT ABSTRACTS OF JAPAN vol. 199, no. 709
PATENT ABSTRACTS OF JAPAN vol. 199, no. 709
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