Abstract: The invention provides a process of manufacturing an optical waveguide for optically connecting a plurality of optical devices, comprising the steps of: disposing a resin composition between two or more optical devices, the resin composition comprising a resin and a 1,4-dihydropyridine derivative, forming an optical path through the resin composition between the optical devices by light having a wavelength capable of inducing a structural change in the 1,4-dihydropyridine derivative, and removing the 1,4-dihydropyridine derivative from the resulting resin composition. Also disclosed is a connection structure obtained by the process.

Abstract: The present invention provides a process for producing an electro-optic hybrid circuit board, which comprises the steps of: forming an undercladding layer on a metal foil side of a metal transfer sheet that comprises a releasable substrate and a metal foil formed thereon; forming a core layer on the undercladding layer; forming an overcladding layer so as to cover the core layer and the undercladding layer; stripping the releasable substrate from the metal foil; and etching the metal foil to thereby form a predetermined conductor pattern.

Abstract: The present invention provides a process for producing an optical waveguide, comprising the steps of: continuously applying a fluorene derivative layer onto a continuous substrate and curing the layer to thereby form a lower cladding layer; continuously applying a photosensitive fluorene derivative layer onto the lower cladding layer; continuously exposing the applied photosensitive fluorene derivative layer to a light through a photomask having a predetermined pattern; continuously subjecting the exposed photosensitive fluorene derivative layer to post-exposure heating; continuously developing the heated photosensitive fluorene derivative layer to remove the unexposed areas therein, thereby forming into the predetermined pattern; curing the developed photosensitive fluorene derivative layer to thereby form a core layer having the predetermined pattern on the lower cladding layer; and continuously applying a fluorene derivative layer over the lower cladding layer so as to cover the core layer and curing the f

Abstract: The present invention provides a process for producing an optical waveguide which comprises: disposing on an undercladding layer at least one member for forming an optical-path deflection plane; forming a photosensitive resin layer over the undercladding layer so as to at least partly cover the member for forming an optical-path deflection plane; subjecting the photosensitive resin layer to exposure and then development to thereby form at least one core layer; and forming an overcladding layer over the undercladding layer so as to cover the at least one core layer.

Abstract: The invention provides an electro-optic hybrid circuit board having an optical waveguide superposed on a wiring circuit board, the electro-optic hybrid circuit board comprising: an insulating layer; a conductor pattern formed on the insulating layer; an undercladding layer formed on the conductor pattern-having insulating layer so as to surround the conductor pattern; a core layer formed on the undercladding layer; and an overcladding layer formed to cover the core layer and the undercladding layer.

Abstract: The present invention provides a process for producing a flexible optical waveguide which comprises the steps of: immersing a substrate having an optical waveguide formed thereon in water to thereby reduce adhesion between the optical waveguide and the substrate and then peeling the optical waveguide from the substrate; temporarily bonding the peeled optical waveguide to a surface of a pressure-sensitive adhesive layer containing a foaming agent; cutting the temporarily bonded optical waveguide into a given length; allowing the foaming-agent-containing pressure-sensitive adhesive layer after the cutting step to foam by heating, thereby reducing adhesion between the foaming-agent-containing pressure-sensitive adhesive layer and the optical waveguide; and peeling the optical waveguide cut into the given length from the foamed adhesive layer.

Abstract: The present invention provides a process for producing an optical waveguide which comprises: disposing on an undercladding layer at least one member for forming an optical-path deflection plane; forming a photosensitive resin layer over the undercladding layer so as to at least partly cover the member for forming an optical-path deflection plane; subjecting the photosensitive resin layer to exposure and then development to thereby form at least one core layer; and forming an overcladding layer over the undercladding layer so as to cover the at least one core layer.

Abstract: This invention provides a process for producing a three-dimensional polyimide optical waveguide, which comprises: (I) irradiating a polyamic acid film with a laser beam while converging the laser beam at an inside portion of the film and relatively moving the light convergence point, the polyamic acid film containing: (a) a polyamic acid obtained from a tetracarboxylic dianhydride and a diamine; and (b) per 100 parts of the polyamic acid, from 0.5 part by weight to less than 10 parts by weight of a specific 1,4-dihydropyridine derivative represented by formula (I): and then, (II) heating the polyamic acid film to imidize the polyamic acid, thereby obtaining an optical waveguide having a continuous core region where the refraction index has been changed, in the thus formed polyimide film.

Abstract: The present invention provides a process for producing an electro-optic hybrid circuit board, which comprises the steps of: forming an undercladding layer on a metal foil side of a metal transfer sheet that comprises a releasable substrate and a metal foil formed thereon; forming a core layer on the undercladding layer; forming an overcladding layer so as to cover the core layer and the undercladding layer; stripping the releasable substrate from the metal foil; and etching the metal foil to thereby form a predetermined conductor pattern.

Abstract: The invention provides an electro-optic hybrid circuit board having an optical waveguide superposed on a wiring circuit board, the electro-optic hybrid circuit board comprising: an insulating layer; a conductor pattern formed on the insulating layer; an undercladding layer formed on the conductor pattern-having insulating layer so as to surround the conductor pattern; a core layer formed on the undercladding layer; and an overcladding layer formed to cover the core layer and the undercladding layer.

Abstract: A process for producing a polyimide optical waveguide, including: (a) forming an undercladding layer on a substrate, (b) forming a photosensitive polyimide resin precursor composition layer on the undercladding layer, (c) irradiating the photosensitive polyimide resin precursor composition layer, excepting a region corresponding to a core pattern, with a UV light through a mask, followed by heating (d) removing a UV-unexposed area of the layer by development, (e) heating a UV-exposed area of the layer to imidize the UV-exposed area, thereby forming a cladding layer having a desired pattern, (f) coating the region corresponding to the core pattern and a surface of the cladding layer with a polyamic acid that forms a polyimide resin having a higher refraction index than the polyimide resin of the cladding layer, and imidizing the polyamic acid by heating to form a core layer, and (g) forming an overcladding layer on the core layer.

Abstract: The present invention provides a process for producing an optical waveguide, comprising the steps of: continuously applying a fluorene derivative layer onto a continuous substrate and curing the layer to thereby form a lower cladding layer; continuously applying a photosensitive fluorene derivative layer onto the lower cladding layer; continuously exposing the applied photosensitive fluorene derivative layer to a light through a photomask having a predetermined pattern; continuously subjecting the exposed photosensitive fluorene derivative layer to post-exposure heating; continuously developing the heated photosensitive fluorene derivative layer to remove the unexposed areas therein, thereby forming into the predetermined pattern; curing the developed photosensitive fluorene derivative layer to thereby form a core layer having the predetermined pattern on the lower cladding layer; and continuously applying a fluorene derivative layer over the lower cladding layer so as to cover the core layer and curing the f

Abstract: The present invention provides a process for producing a flexible optical waveguide which comprises the steps of: immersing a substrate having an optical waveguide formed thereon in water to thereby reduce adhesion between the optical waveguide and the substrate and then peeling the optical waveguide from the substrate; temporarily bonding the peeled optical waveguide to a surface of a pressure-sensitive adhesive layer containing a foaming agent; cutting the temporarily bonded optical waveguide into a given length; allowing the foaming-agent-containing pressure-sensitive adhesive layer after the cutting step to foam by heating, thereby reducing adhesion between the foaming-agent-containing pressure-sensitive adhesive layer and the optical waveguide; and peeling the optical waveguide cut into the given length from the foamed adhesive layer.

Abstract: A process of producing a polymer optical waveguide, including (a) a step of forming an undercladding layer on a substrate; (b) a step of forming a photosensitive resin composition layer containing a 1,4-dihydropyridine derivative and a resin on the undercladding layer; (c) a step of irradiating a region of the photosensitive resin composition layer corresponding to a core pattern with UV light through a mask to form UV light-exposed areas and UV light-unexposed areas on the photosensitive resin composition layer; (d) a step of heating the UV light-exposed areas and UV light-unexposed areas of the photosensitive resin composition layer; and (e) a step of forming an overcladding layer on the photosensitive resin composition layer after heating.

Abstract: The invention provides a process of manufacturing an optical waveguide for optically connecting a plurality of optical devices, comprising the steps of: disposing a resin composition between two or more optical devices, the resin composition comprising a resin and a 1,4-dihydropyridine derivative, forming an optical path through the resin composition between the optical devices by light having a wavelength capable of inducing a structural change in the 1,4-dihydropyridine derivative, and removing the 1,4-dihydropyridine derivative from the resulting resin composition. Also disclosed is a connection structure obtained by the process.

Abstract: This invention provides a process for producing a polyimide optical waveguide, which comprises the steps of: (a) forming an undercladding layer on a substrate, (b) forming a photosensitive polyimide resin precursor composition layer on the undercladding layer, (c) irradiating the photosensitive polyimide resin precursor composition layer, excepting a region corresponding to a core pattern, with a UV light through a mask, followed by heating after exposure, (d) removing a UV-unexposed area of the layer by development, (e) heating a UV-exposed area of the layer to imidize the UV-exposed area, thereby forming a cladding layer having a desired pattern, (f) coating the region corresponding to the core pattern and a surface of the cladding layer with a polyamic acid that forms a polyimide resin having a higher refraction index than the polyimide resin of the cladding layer, and imidizing the polyamic acid by heating to form a core layer, and (g) forming an overcladding layer on the core layer, wherein the photosens

Abstract: This invention provides a process for producing a three-dimensional polyimide optical waveguide, which comprises: (I) irradiating a polyamic acid film with a laser beam while converging the laser beam at an inside portion of the film and relatively moving the light convergence point, the polyamic acid film containing: (a) a polyamic acid obtained from a tetracarboxylic dianhydride and a diamine; and (b) per 100 parts of the polyamic acid, from 0.

Abstract: A process of producing a polymer optical waveguide, including (a) a step of forming an undercladding layer on a substrate; (b) a step of forming a photosensitive resin composition layer containing a 1,4-dihydropyridine derivative and a resin on the undercladding layer; (c) a step of irradiating a region of the photosensitive resin composition layer corresponding to a core pattern with UV light through a mask to form UV light-exposed areas and UV light-unexposed areas on the photosensitive resin composition layer; (d) a step of heating the UV light-exposed areas and UV light-unexposed areas of the photosensitive resin composition layer; and (e) a step of forming an overcladding layer on the photosensitive resin composition layer after heating.