Abstract: An optical connection structure including first optical fibers, second optical fibers, a first optical connector, and a second optical connector is disclosed. The first optical connector is configured such that each of first distal end portions of the first optical fibers protrudes from a first front end surface to the outside when the first optical connector and the second optical connector are connected to each other. Each of the first distal end portions is inserted into a corresponding second fiber hole of the second optical connector. The second optical connector is configured such that each of second distal end portions of the second optical fibers is moved rearward inside second fiber holes due to each of the first distal end portions respectively inserted into the second fiber holes. The first optical fibers and the second optical fibers are optically coupled to each other inside the second fiber holes.

Abstract: An adapter includes a tubular body having a tubular shape and surrounding a pair of ferrules over half a circumference or more with a ling along a first direction as an axis. The tubular body includes a guide extending in the first direction and engaging with side surfaces of the ferrule, and a slit formed from one end to the other end in the first direction.

Abstract: An optical connection structure including first optical fibers, second optical fibers, a first optical connector, and a second optical connector is disclosed. The first optical connector is configured such that each of first distal end portions of the first optical fibers protrudes from a first front end surface to the outside when the first optical connector and the second optical connector are connected to each other. Each of the first distal end portions is inserted into a corresponding second fiber hole of the second optical connector. The second optical connector is configured such that each of second distal end portions of the second optical fibers is moved rearward inside second fiber holes due to each of the first distal end portions respectively inserted into the second fiber holes. The first optical fibers and the second optical fibers are optically coupled to each other inside the second fiber holes.

Abstract: A ferrule includes a first end surface and a second end surface, an outer surface, an accommodating part, a plurality of guide grooves, a window part, and a pressing part. The plurality of guide grooves are provided to each extend in the first direction on an inner wall of the accommodating part and be aligned in a second direction intersecting the first direction. The window part opens at the outer surface and is connected to the accommodating part. The pressing part is disposed in the window part to press the plurality of optical fibers toward the plurality of guide grooves. The window part is provided at a position facing at least a portion of the plurality of guide grooves. The pressing part can be fitted into the window part so that a gap is provided between an inner wall of the window part and the pressing part.

Abstract: A ferrule includes an optical fiber holding portion configured to hold a plurality of optical fibers, and a first side surface and a second side surface facing each other in a second direction intersecting a first direction in which the optical fiber holding portion extends. The first side surface is provided with a first recessed portion or a first protruding portion extending along the first direction. The second side surface is provided with a second recessed portion or a second protruding portion extending along the first direction. In this ferrule, the first recessed portion or the first protruding portion includes a first positioning portion and a second positioning portion separated from each other in the first direction.

Abstract: A ferrule includes a first end surface and a second end surface, an outer surface, an accommodating part, a plurality of guide grooves, and a first window part and a second window part. The plurality of guide grooves are provided to each extend in the first direction on an inner wall of the accommodating part and be aligned in a second direction intersecting the first direction. The first window part and the second window part open at the outer surface and are connected to each other through the accommodating part. The first window part is positioned on the first end surface side with respect to the second window part. The first window part is provided at a position through which at least a portion of the guide grooves are visually noticeable.

Abstract: An optical connection structure including a first ferrule, a second ferrule, and an adapter is disclosed. The first ferrule includes a distal end portion where a first light incidence/emission unit is formed. The second ferrule includes a distal end portion where a second light incidence/emission unit is formed. Each first side surface of both the ferrules is provided with a recessed portion or a protruding portion, and each second side surface of both the ferrules is provided with a recessed portion or a protruding portion. The adapter has an inner surface provided with a protruding portion or a recessed portion, and a protruding portion or a recessed portion. Both the ferrules are fittable into the adapter such that the first and second light incidence/emission units are optically connected each other while the distal end portions of both the ferrules face each other at a predetermined distance separated from each other.

Abstract: A ferrule includes: a tip surface; an opening portion provided on a side opposite to the tip surface in a first direction intersecting the tip surface; a plurality of fiber grooves extending along the first direction and arranged along a second direction intersecting the first direction between the tip surface and the opening portion, the plurality of fiber grooves being capable of respectively supporting a plurality of optical fibers; and a plurality of lenses respectively disposed on extension lines of the plurality of fiber grooves. The fiber groove has a first fiber groove portion for positioning the optical fiber with respect to the lens and a second fiber groove portion for introducing the optical fiber into the first fiber groove portion. The first fiber groove portion is disposed closer to the lens than the second fiber groove portion in the first direction.

Abstract: An optical connector includes a ferrule accommodating an optical fiber, and a housing covering an outer circumference of the ferrule. An outer circumferential surface of the ferrule has a recessed part or a projecting part for positioning extending in an optical axis direction of the optical fiber. The housing has a slit extending in the optical axis direction at a position corresponding to the recessed part or the projecting part of the ferrule.

Abstract: An optical connection structure includes a plurality of optical fibers, a ferrule, and an adapter. The ferrule has a first side surface and a second side surface facing each other. The first side surface is provided with a first recess portion or a first protrusion portion extending along a first direction in which the ferrule is inserted into the adapter. The second side surface is provided with a second recess portion or a second protrusion portion extending along the first direction. An inner surface of the adapter is provided with each of a third protrusion portion or a third recess portion fittable with the first recess portion or the first protrusion portion and a fourth protrusion portion or a fourth recess portion fittable with the second recess portion or the second protrusion portion.

Abstract: An optical connection structure including first optical fibers, second optical fibers, a first optical connector, and a second optical connector is disclosed. The first optical connector is configured such that each of first distal end portions of the first optical fibers protrudes from a first front end surface to the outside when the first optical connector and the second optical connector are connected to each other. Each of the first distal end portions is inserted into a corresponding second fiber hole of the second optical connector. The second optical connector is configured such that each of second distal end portions of the second optical fibers is moved rearward inside second fiber holes due to each of the first distal end portions respectively inserted into the second fiber holes. The first optical fibers and the second optical fibers are optically coupled to each other inside the second fiber holes.

Abstract: A cap for an optical connector adaptor, including: a base portion including a first surface and a second surface provided on an opposite side of the first surface; a grip portion formed by protruding from the first surface of the base portion; a fitting portion configured to protrude from the second surface of the base portion and to be fitted to an optical connector adapter; and a cover portion that is formed over the whole outer periphery of the base portion, in which the second surface includes a contact surface where the optical connector adapter and the cap for an optical connector adaptor contact each other, and in which the cover portion is configured to surround the contact surface from the outer periphery of the base portion.

Abstract: An optical fiber cleaver includes: a body unit on which an optical fiber extending in a first direction is loaded; a lid unit connected to the body unit to be rotatable and openable; a pair of retainers arranged to be separate from each other in the first direction and retain the optical fiber between the pair of retainers when the lid unit is closed with respect to the body unit; a blade member that comes into contact with the optical fiber from one direction side of a second direction intersecting the first direction between the pair of retainers and hurt the optical fiber; and a movement unit that brings the blade member into contact with the optical fiber from the one direction side of the second direction and move the blade member to one direction side of a third direction intersecting the first direction and the second direction.

Abstract: An elastic member according to an embodiment is an elastic member that biases a ferrule retaining a plurality of optical fibers in a connecting direction. The elastic member is stored in an inner housing that accommodates the ferrule, the elastic member has a space in its inside into which a 16-fiber tape fiber is inserted, and the elastic member is in a noncircular shape in a cross section intersecting with the connecting direction. The elastic member includes a pair of first portions having an outer surface opposite to a pair of inner surfaces in an arc shape of the housing, the inner surfaces being opposite to each other along a first direction intersecting with the connecting direction and a pair of second portions opposite to the tape fiber along a second direction intersecting with both of the connecting direction and the first direction.

Abstract: An optical connector ferrule according to an embodiment includes an MT ferrule, and a spacer mounted on an optical end surface of the MT ferrule and having a guide hole into which a guide pin is inserted. The spacer has a contact surface that contacting the counterpart connector and a recess surrounded by the contact surface. The spacer includes a lens part exposed on a bottom surface of the recess and optically coupled to the optical end surface of the MT ferrule and a base part that retains the lens part by surrounding the lens part. The material of the lens part and the material of the base part are different from each other, and the difference between the linear expansion coefficient of the base part and the linear expansion coefficient of the MT ferrule is 0.5×10?5/° C. or less.

Abstract: An optical connector is disclosed. The optical connector includes a rear housing, an inner housing, and an outer housing. The inner housing includes a retaining hole to accommodate a ferrule. The outer housing is disposed on an outer periphery of the inner housing to cover a front portion of the inner housing. The outer housing rotates about the central axis with respect to the inner housing by a rotation guiding mechanism cooperating with an adapter for connecting the optical connector to another optical connector. The outer housing includes a front wall covering the distal end of the inner housing. The front wall includes at least one opening region. The opening region corresponds to a fiber exposed surface of the ferrule when the outer housing is rotated with respect to the inner housing from an initial position to a connected position by the rotation guiding mechanism.

Abstract: An elastic member according to an embodiment is an elastic member that biases a ferrule retaining a plurality of optical fibers in a connecting direction. The elastic member is stored in an inner housing that accommodates the ferrule, the elastic member has a space in its inside into which a 16-fiber tape fiber is inserted, and the elastic member is in a noncircular shape in a cross section intersecting with the connecting direction. The elastic member includes a pair of first portions having an outer surface opposite to a pair of inner surfaces in an arc shape of the housing, the inner surfaces being opposite to each other along a first direction intersecting with the connecting direction and a pair of second portions opposite to the tape fiber along a second direction intersecting with both of the connecting direction and the first direction.

Abstract: An optical connector is disclosed. The optical connector includes a rear housing, an inner housing, and an outer housing. The inner housing includes a retaining hole to accommodate a ferrule. The outer housing is disposed on an outer periphery of the inner housing to cover a front portion of the inner housing. The outer housing rotates about the central axis with respect to the inner housing by a rotation guiding mechanism cooperating with an adapter for connecting the optical connector to another optical connector. The outer housing includes a front wall covering the distal end of the inner housing. The front wall includes at least one opening region. The opening region corresponds to a fiber exposed surface of the ferrule when the outer housing is rotated with respect to the inner housing from an initial position to a connected position by the rotation guiding mechanism.

Abstract: A cap for an optical connector adaptor, including: a base portion including a first surface and a second surface provided on an opposite side of the first surface; a grip portion formed by protruding from the first surface of the base portion; a fitting portion configured to protrude from the second surface of the base portion and to be fitted to an optical connector adapter; and a cover portion that is formed over the whole outer periphery of the base portion, in which the second surface includes a contact surface where the optical connector adapter and the cap for an optical connector adaptor contact each other, and in which the cover portion is configured to surround the contact surface from the outer periphery of the base portion.

Abstract: An optical fiber cleaver includes: a body unit on which an optical fiber extending in a first direction is loaded; a lid unit connected to the body unit to be rotatable and openable; a pair of retainers arranged to be separate from each other in the first direction and retain the optical fiber between the pair of retainers when the lid unit is closed with respect to the body unit; a blade member that comes into contact with the optical fiber from one direction side of a second direction intersecting the first direction between the pair of retainers and hurt the optical fiber; and a movement unit that brings the blade member into contact with the optical fiber from the one direction side of the second direction and move the blade member to one direction side of a third direction intersecting the first direction and the second direction.