Abstract: An optical module includes a substrate, an optical element, and a lens module. The optical element is mounted on the substrate. The lens module includes an outer surface and an inner surface facing each other and a lens provided on the inner surface so as to be optically coupled to the optical element and optically couples an optical fiber with the optical element through the lens. The lens module is mounted on the substrate such that the inner surface faces the substrate and is attached to the substrate with an adhesive introduced into a gap between the inner surface and the substrate. The optical module is provided with an inflow prevention structure that prevents inflow of the adhesive to an optical axis of the lens between the substrate and the lens module and between the lens and the adhesive.

Abstract: An optical module includes a substrate, an optical element, an optical coupling module, and an adhesive. The substrate includes a glass cloth therein. The optical element is mounted on the substrate. The optical coupling module is configured to be optically coupled to the optical element. The adhesive fixes the optical coupling module to the substrate. A cavity recessed from a first main surface of the substrate toward a second main surface of the substrate so as to include a bottom portion is formed in the substrate. At least a part of the optical coupling module is accommodated in the cavity. The glass cloth includes a protruding portion protruding into the cavity from a side surface of the cavity. The protruding portion is stuck into the adhesive positioned between the side surface and the optical coupling module.

Abstract: An optical module includes an optical component, a substrate including a main surface, a mount portion provided on the main surface of the substrate, and at least one measurement reference portion provided on the main surface of the substrate at a position apart from the mount portion. The substrate mounts the optical component thereon. The mount portion is configured to mount the optical component thereon. The measurement reference portion includes a reference point that becomes a height reference when measuring a mount height of the optical component.

Abstract: An optical module includes a substrate including a main surface, an optical component including a bottom surface, and a first side surface and a second side surface each extending in a direction intersecting the bottom surface and facing each other, and an adhesion portion fixing the optical component to the substrate. The optical component is mounted on the substrate such that the bottom surface faces the main surface. In this optical module, the adhesion portion includes a plurality of first adhesion portions provided along the first side surface and a plurality of second adhesion portions provided along the second side surface.

Abstract: An optical fiber comprises a glass fiber comprising a core and a cladding; and a coating resin layer coating the glass fiber, wherein the coating resin layer has a primary resin layer in contact with the glass fiber and coating the glass fiber and a secondary resin layer coating the outer periphery of the primary resin layer, the primary resin layer has a Young's modulus of 0.4 MPa or less at 23° C. and the primary resin layer has an outer diameter of 185 ?m or more and 202 ?m or less, the secondary resin layer has a glass transition temperature of 60° C. or more and 95° C. or less, and the difference between the average linear expansion coefficient of the coating resin layer in the range of 60° C. to 140° C. and the average linear expansion coefficient of the coating resin layer in the range of ?60° C. to 0° C. is 0.7×10?4/° C. or less.

Abstract: An optical connector module connected to an optical component is disclosed. The optical connector includes at least one optical fiber, a connector that holds the optical fiber, the connector being configured to be connected to the optical component in a first direction, and a connecting member configured to maintain a connected state between the connector and the optical component when the connector is connected to the optical component. The connecting member is configured to rotate in contact with the connector and to be engaged with each of the connector and the optical component.

Abstract: A coupling member for coupling an optical component to a connector in a first direction is disclosed. The coupling member includes a locking portion that extends in a second direction intersecting the first direction, the coupling member being configured to be locked to the optical component, an elastic portion configured to press the connector toward the optical component in the first direction, and a connecting portion that connects the locking portion to the elastic portion. The elastic portion is movable outward of the connector in a planar direction defined by the first direction and the second direction.

Abstract: An optical fiber comprises a glass fiber comprising a core and a cladding; and a coating resin layer coating the glass fiber, wherein the coating resin layer has a primary resin layer in contact with the glass fiber and coating the glass fiber and a secondary resin layer coating the outer periphery of the primary resin layer, the primary resin layer has a Young's modulus of 0.4 MPa or less at 23° C. and the primary resin layer has an outer diameter of 185 ?m or more and 202 ?m or less, the secondary resin layer has a glass transition temperature of 60° C. or more and 95° C. or less, and the difference between the average linear expansion coefficient of the coating resin layer in the range of 60° C. to 140° C. and the average linear expansion coefficient of the coating resin layer in the range of ?60° C. to 0° C. is 0.7×10?4/° C. or less.

Abstract: A splicing structure of optical fibers in which optical fibers are coupled together, the optical fibers each comprising: a coated fiber portion including a glass fiber and a coating layer coating an outer periphery of the glass fiber; and a bare fiber portion where a certain length of the glass fiber is projected from an end face of the coating layer in an extending direction, wherein the glass fiber end faces of the bare fiber portion are fusion coupled together, and an outer periphery of the bare fiber portion is coated by a recoating layer, the recoating layer is a cured product of an ultraviolet light curable resin composition including a urethane (meth)acrylate oligomer and a mold release agent, and a content of the mold release agent is 0.01 to 1.5% by mass based on a total amount of the ultraviolet light curable resin composition.

Abstract: An optical fiber includes an optical transmission medium comprising a core and a cladding; a primary resin layer disposed in contact with the optical transmission medium to coat the optical transmission medium; and a secondary resin layer coating the primary resin layer, and 1.1 ppm or less of a phosphorus compound and 2.5% by mass or less of a phenol compound based on the total amount of the primary resin layer are contained in the primary resin layer.

Abstract: The purpose of the present invention is to provide a method for efficiently producing an immobilized allulose epimerase having high activity and excellent durability. An immobilized allulose epimerase having high specific activity and excellent durability can be produced efficiently by bringing an enzyme solution containing an allulose epimerase having a specific activity equal to or higher than a specific level into contact with a styrene-based porous-type weakly basic anion exchange resin or a styrene-based gel-type weakly basic anion exchange resin.

Abstract: In an ultraviolet-curable resin composition for an optical fiber coating, the polarity parameter ET(30) of the resin composition is 47 to 61.

Abstract: A splicing structure of optical fibers in which optical fibers are coupled together, the optical fibers each comprising: a coated fiber portion including a glass fiber and a coating layer coating an outer periphery of the glass fiber; and a bare fiber portion where a certain length of the glass fiber is projected from an end face of the coating layer in an extending direction, wherein the glass fiber end faces of the bare fiber portion are fusion coupled together, and an outer periphery of the bare fiber portion is coated by a recoating layer, the recoating layer is a cured product of an ultraviolet light curable resin composition including a urethane (meth)acrylate oligomer and a mold release agent, and a content of the mold release agent is 0.01 to 1.5% by mass based on a total amount of the ultraviolet light curable resin composition.

Abstract: In an ultraviolet-curable resin composition for an optical fiber coating, the polarity parameter ET(30) of the resin composition is 47 to 61.

Abstract: An optical fiber includes an optical transmission medium comprising a core and a cladding; a primary resin layer disposed in contact with the optical transmission medium to coat the optical transmission medium; and a secondary resin layer coating the primary resin layer, and 1.1 ppm or less of a phosphorus compound and 2.5% by mass or less of a phenol compound based on the total amount of the primary resin layer are contained in the primary resin layer.

Abstract: An optical fiber comprising: a glass fiber including a core and a cladding; and a coating layer coating an outer periphery of the glass fiber; wherein the coating layer includes a primary coating layer and a secondary coating layer, and a hardness at a depth of 200 nm from a surface of the secondary coating layer, HIT-200 nm, is 0.02 to 0.20 GPa as measured with a nano indenter.

Abstract: An optical fiber includes an optical transmission medium having a core and a cladding, a primary resin layer disposed in contact with the optical transmission medium to coat the optical transmission medium, and a secondary resin layer coating the primary resin layer, wherein a Young's modulus of the primary resin layer is 0.5 MPa or less at 23° C., and the primary resin layer comprises a cured product of an ultraviolet light curable resin composition containing a urethane (meth)acrylate oligomer, a monomer, a photopolymerization initiator and a ?-diketone compound, and tin.

Abstract: A thickening composition which contains specific amounts of a metal salt-enclosing dextrin and a thickening polysaccharide and which has a good dispersibility raises the viscosity rapidly, and has an excellent thickening effect can be produced by the steps of obtaining the metal salt-enclosing dextrin by mixing, dissolving, and homogenizing a dextrin and a metal salt in water, followed by drying, and adding the metal salt-enclosing dextrin to the thickening polysaccharide followed by mixing or granulation. The thickening composition makes it possible to provide a thickening composition which has a good dispersibility, raises the viscosity rapidly, and offers an improved thickening effect per unit mass in a wide variety of water-containing foods such as water, teas, refreshing beverages, dairy beverages, soups, and thick liquid foods.

Abstract: An optical fiber includes an optical transmission medium having a core and a cladding; a primary resin layer disposed in contact with the optical transmission medium to coat the optical transmission medium; and a secondary resin layer coating the primary resin layer, wherein the primary resin layer comprises a cured product of an ultraviolet light curable resin composition comprising a urethane (meth)acrylate oligomer, a monomer and a photopolymerization initiator, and a compound containing phosphorus and tin as constituent atoms; and a Young's modulus of the primary resin layer is 0.5 MPa or less at 23° C.

Abstract: Novel findings have been made that a carbohydrate composition in which a highly branched dextrin and isomaltulose are mixed at a specific ratio, wherein the highly branched dextrin has a structure in which glucose or isomaltooligosaccharide is bound to a non-reducing terminus of a dextrin via an ?-1,6 glycosidic bond, and has a DE value of 10 to 52, enhances an suppressing effect on digestion of the highly branched dextrin by isomaltulose, that is, synergistically suppresses the digestion, thereby leading to the completion of the present invention.