Abstract: The process utilizes the fact that fluorescent optical fibres can be laterally excited by light radiation by supplying concentrated light signals to their ends.The invention proposes applying this process to producing indicating, control, logic function measurement and similar apparatus, as well as for producing solar collectors for the direct generation of electricity.

Abstract: The process utilizes the fact that fluorescent optical fibres can be laterally excited by light radiation by supplying concentrated light signals to their ends. The invention proposes applying this process to producing indicating, control, logic function measurement and similar apparatus, as well as for producing solar collectors for the direct generation of electricity.

Abstract: According to the invention, the process consists of using plastics optical fibres obtained by drawing, the introduction of one of the ends of said fibres into recesses formed for this purpose in mechanical connecting parts, raising the temperature of said ends in order to increase their diameter until they fill said recesses and adapt closely to the internal surface shape of these recesses. It makes it possible to join the ends of optical fibres to centering terminations used for the fitting in the connectors and for producing multiplexing connectors.

Abstract: Process for the production of a multipoint light guide and products obtained according to this process. This process consists of placing in a mold a bundle of plastics optical fibers obtained by drawing, said fibers being parallel and adjacent to one another and wherein the mold - bundle assembly temperature is homogeneously raised, in order to increase the diameter of the optical fibers until they fill the entire interior of the mold and e.g. assume a hexagonal shape, the thus treated bundle of optical fibers forming the light guide. It in particular makes it possible to obtain multipoint light guides combining both a transmission of images with a unity magnification and the enlargement or reduction thereof.

Abstract: Optical fibres of methyl methacrylate-styrene copolymer are produced by forming a sheath in the form of a solid cylinder having at least one cylindrical recess and at least one cylindrical rod constituting the core of the fibres, the rod having a smaller diameter than the recess, introduction of the cylindrical rod into the recess, placing the gap defined between the rod and the cylinder under a vacuum, raising the temperature in order to soften the cylinder and engage it with the rod under the effect of the vacuum and drawing the thus obtained preform.

Abstract: Described are optical fibers having a core of plastic material, such as polystyrene, and a polymer covering of vinyl acetate or a fluorine-containing derivative of vinyl acetate, and a process for producing the same by drawing a bar of the same materials.