Abstract: An object of the present invention is to provide a ferrule rotation engagement unit and an optical switch using the same capable of realizing stable optical characteristics in optical path switching with low power consumption and more economically. A ferrule rotation engagement unit according to the present disclosure includes a first ferrule and a second ferrule in which core centers of one or a plurality of single-core fibers are disposed on a circumference having a predetermined radius from a center in the cross section of the ferrule, a cylindrical sleeve into which one end of a convex shape of the first ferrule and the second ferrule are inserted, a spring that apply pressure to the first flange or the second flange in a direction in which the first ferrule and the second ferrule abut against each other, and a holder that holds the first ferrule, the second ferrule, and the sleeve so that the center axes of the first ferrule and the second ferrule are aligned.

Abstract: A fiber cutter includes: a gripping member that grips an optical fiber; a blade that forms an initial cut in the optical fiber gripped by the gripping member; and a bending part that applies a predetermined bending stress to the optical fiber when the blade forms the initial cut in the optical fiber.

Abstract: An object of the present invention is to provide an optical transmission system capable of reducing system costs and reducing waste of output power of a light source. The optical transmission system according to the present invention includes an ultraviolet light source part 11a having a light emitting diode (LED) that outputs ultraviolet light, an optical transmission line 26 that propagates the ultraviolet light through a plurality of cores of a multi-core optical fiber or a plurality of cores of a bundle optical fiber obtained by bundling a plurality of single-core optical fibers, and an optical system 11c that narrows down a spot shape of the ultraviolet light output from the LED to a size including all of the plurality of cores in an optical axis direction, and causes the ultraviolet light to enter the plurality of cores.

Abstract: An object of the present invention is to provide an air conditioner unit that can fully demonstrate the sterilization effect on air with a large flow rate, even by a method of irradiating a filter and a coil with ultraviolet light. The air conditioner unit according to the present invention includes a filter 20 through which air passes, a plurality of optical fibers 16 arranged in such a manner that one ends thereof are close to a surface of the filter 20 and arranged at predetermined intervals, and a light source 30 that supplies ultraviolet light from the other end of each of the optical fibers 16. Since the intensity of the light is inversely proportional to the square of the distance from the light source, if the same sterilization effect is to be obtained, the shorter the irradiation distance, the smaller the irradiation intensity of the ultraviolet light can be.

Abstract: The present disclosure has an object to provide a multicore optical connector that can achieve size reduction and pitch reduction without performing highly accurate machining of V-grooves or the like. The present disclosure is a multicore optical connector including a holding member 11 having a flat bottom surface 14B, and provided with a groove that enables a plurality of optical fibers 91 to be arranged along the bottom surface 14B, the plurality of optical fibers 91 stored in a row on the bottom surface of the groove, and a lid 15 that is in contact with all the plurality of optical fibers 91 and is fixed to the plurality of optical fibers 91 and the holding member 11 in a state in which the plurality of optical fibers 91 are pressed against the bottom surface 14B of the groove to form a long hole 12 at the groove 14.

Abstract: An object of the present disclosure is to enable an optical switch capable of driving stable optical characteristics with respect to external factors with low power consumption to be achieved at low cost. The present disclosure is an optical connection device that connects a first ferrule and a second ferrule, the optical connection device including: a cylindrical sleeve into which the first ferrule and the second ferrule are inserted; a spring that abuts a distal end portion of the first ferrule and a distal end portion of the second ferrule on each other; and a holder that holds the first ferrule, the second ferrule, the cylindrical sleeve, and the spring, in which the first ferrule or the second ferrule is movable in any direction perpendicular to a central axis in the holder, and is held by the holder so as not to rotate about the central axis.

Abstract: An object of the present invention is to provide an ultraviolet light irradiation sheet that can be decontaminated regardless of a shape of an object to be decontaminated. An ultraviolet light irradiation sheet (50) includes an optical fiber (20) which emits a part of propagating light from a side surface or an end surface; and a deformable sheet (10) which incorporates the optical fiber (20). The ultraviolet light irradiation sheet uniformly or partially irradiates ultraviolet light from a sheet surface. Therefore, by covering the object to be sterilized with the ultraviolet light irradiation sheet, a material having a complicated shape or an amorphous shape can be irradiated with the ultraviolet light without making a shade. Since the ultraviolet light irradiation sheet does not diffuse bacteria and viruses by wind, the sterilization of the object to be sterilized can be performed without forming a closed space.

Abstract: An object of this disclosure is to enable space saving of an optical fiber connection unit such as an optical switch. According to this disclosure, there is provided an optical connection module that connects first and second multi-fiber connectors, in which the first and second multi-fiber connectors have optical fibers which are two-dimensionally arranged. In the first multi-fiber connector, optical fibers connected to a same optical switch are arranged in a vertical direction, and optical fibers connected to different optical switches are arranged in parallel in a horizontal direction. In the second multi-fiber connector, optical fibers connected to a same optical switch are arranged in a horizontal direction, and optical fibers connected to different optical switches are arranged in parallel in a vertical direction.

Abstract: An object of the present invention is to provide a banknote disinfection system configured to disinfect banknotes in a general-purpose banknote handling device without making a significant change in the structure of the general-purpose device. The banknote disinfection system 300 includes a conveyance mechanism configured to convey a banknote 50 using a plurality of rollers 12 and an optical fiber 20 configured to emit ultraviolet light to a surface of the banknote 50 conveyed by the conveyance mechanism. An optical fiber is thin, has many length options, and is flexible. With these features of the optical fiber, the optical fiber can be routed inside of, for example, an automatic teller machine to irradiate the banknotes moving inside the device with ultraviolet light.

Abstract: An object of the present invention is to provide a photocatalytic sheet configured to perform disinfection independent of the state of external light. A photocatalytic sheet 50 according to the present invention includes a sheet 10 having a photocatalytic layer 17 on one surface, and an optical fiber 20 embedded in the sheet 10 and configured to supply ultraviolet light UV from inside of the sheet 10 to the photocatalytic layer 17. In the photocatalytic sheet, ultraviolet light is supplied from the optical fiber disposed in the sheet to the photocatalytic layer coated on the surface of the sheet (ultraviolet light is supplied from the back of the photocatalytic layer). This configuration allows for disinfection independent of the state of external light.

Abstract: An object of the present invention is to provide an ultraviolet light irradiation system that is easy to operate and can avoid degradation of a material due to ultraviolet light. An ultraviolet light irradiation system according to the present invention includes: one ultraviolet light source unit 11 that generates ultraviolet light; an irradiation unit 13 that irradiates a desired portion (irradiation portion ste) with the ultraviolet light in a limited manner; an optical fiber 14 that propagates the ultraviolet light from the ultraviolet light source unit 11 to the irradiation unit 13; a sensing unit 16 that monitors a state of the irradiation portion ste and outputs the state as monitoring information; and an irradiation control unit 15 that controls output of the ultraviolet light from the ultraviolet light source unit 11 on the basis of the monitoring information.

Abstract: An object of the present disclosure is to provide an optical switch that does not require power supply.

Abstract: An object of the present invention is to provide an air conditioner unit that allows for greater flexibility in designing the shape of the unit and is capable of reducing the cost of lamp replacement. An air conditioner unit according to the present invention includes an optical fiber group 17 formed by bundling a plurality of optical fibers 16 emitting a part of propagating light from side faces thereof; an air duct 10 that incorporates the optical fiber group 17 in a space 13 through which air passes; and a light source 30 that supplies ultraviolet light to each of the optical fibers 16. Since the intensity of the light is inversely proportional to the square of the distance from the light source, if the same sterilization effect is to be obtained, the irradiation intensity of the ultraviolet light can be reduced when the irradiation distance is shorter.

Abstract: An object of the present disclosure is to provide an optical switch that does not require power supply.

Abstract: An object of the present invention is to provide an ultraviolet optical transmission system in which cutting of an optical fiber or a complicated procedure is not necessary when an optical fiber is exchanged.

Abstract: An object of the present disclosure is to enable a plurality of single fibers to be easily and collectively connected. The present disclosure is a cylindrical multi-fiber ferrule including through holes each having a cylindrical shape and configured to hold a plurality of optical fibers on the same circle centered on a central axis of the cylindrical shape, in which a region where the through holes are arranged at one end of the cylindrical shape in a longitudinal direction has a spherical shape, and a central region where the through holes are not arranged at one end of the cylindrical shape in the longitudinal direction is a flat surface shape perpendicular to the longitudinal direction of the cylindrical shape.

Abstract: An object of the present invention is to provide an ultraviolet light irradiation system and an ultraviolet light irradiation method having a P-MP configuration capable of obtaining a predetermined effect such as sterilization. An ultraviolet light irradiation system 301 according to the present invention includes an ultraviolet light source unit 11 that generates ultraviolet light, N (N is a natural number) irradiation units 13 that irradiate a desired site (irradiation target region ste) with the ultraviolet light, an optical switch 12 that switches the ultraviolet light to each of paths 14 to the irradiation units 13, and a switching control unit 15 that controls a switching operation of the optical switch 12 so as to give an opportunity to be supplied with an integrated light amount per unit time equal for each of the paths 14 on the basis of a transmission loss of the ultraviolet light for each of the paths 14 and an irradiation area where the irradiation unit 13 irradiates the ultraviolet light.

Abstract: The present disclosure has been proposed in view of the above circumstances, and an object is to provide a multi-core optical connector that does not need to increase a spring pressing force even when the number of cores to be connected increases. The present disclosure is an optical connector including: a ferrule that holds a plurality of optical fibers in a state where end faces of the plurality of optical fibers are arranged on the same plane; and a refractive index matching portion that is deformable, in close contact with the end faces of the plurality of optical fibers arranged on the ferrule, and performs matching of a refractive index with the plurality of optical fibers.

Abstract: An object of the present disclosure is to provide an optical connector cleaning tool capable of cleaning a ferrule end surface with an appropriate force regardless of an operator. The present disclosure is an optical connector cleaning tool including a housing that stores a cleaning sheet, an opening portion through which a part of the cleaning sheet is exposed from the housing, a slide mechanism that causes the cleaning sheet exposed to the opening portion to slide, a cleaning sheet support portion that is fixed to the housing and supports the cleaning sheet toward the opening portion, a plug holding unit that holds an optical connector plug having a ferrule disposed at a distal end thereof at the opening portion, and a pressing portion that applies a pressing force between the cleaning sheet support portion and the plug holding unit.

Abstract: An object of the present invention is to provide an ultraviolet light irradiation system and an ultraviolet light irradiation method, each of which is capable of reducing deterioration over time of transmission loss characteristics of an optical fiber due to ultraviolet rays and preventing a decrease in ultraviolet ray irradiation power.