JP2014095883A - Optical transmission system and optical rotary joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce influence of reflection light (return light) on an end face of an optical fiber cable.SOLUTION: In an optical rotary joint, a rotary body side member 204 extends an optical fiber member 206 on the axis of rotation and supports the optical fiber member 206 with an end face 112b of a rotary body-side optical fiber cable 112 and one end face 206a of the optical fiber member 206 coming into contact with each other. A fixed body side member 202 supports a fixed body-side optical fiber cable 110 such that an end face 110b of the fixed body-side optical fiber cable 110 is faced toward the other end face 206b of the optical fiber member 206 on the axis of rotation and leaves a gap from the other end face 206b. At least any one of the other end face 206b of the optical fiber member 206 and the end face 110b of the fixed body-side optical fiber cable 110 is provided with an inclined surface having an inclination relative to an orthogonal plane orthogonal to the axis of rotation.

Description

  The present invention relates to an optical transmission system that performs optical transmission between a rotating body side optical fiber cable and a fixed body side optical fiber cable, and an optical rotary joint used in the system.

Conventionally, in an optical rotary joint that connects an optical fiber cable on the rotating structure side and an optical fiber cable on the fixed structure side at the joint between the rotating structure side wiring and the fixed structure side wiring, the joint is made by paralleling the transmitted light by two lenses. The gap is transmitted.
FIG. 8 is an explanatory diagram showing an example of the configuration of the optical rotary joint 70 according to the conventional technique. A conventional optical rotary joint 70 shown in FIG. 8 includes a fixed member side member 72 to which a fixed structure side optical fiber cable FCx is fixed and a rotating member side member 74 to which a rotating structure side optical fiber cable FCr is fixed. . The rotating body side member 74 is rotatably connected to the fixed body side member 72 via a bearing 76. The rotating member side member 74 is fixed with a lens 78 for converting divergent light from the rotating structure side optical fiber cable FCr into parallel light. In addition, a lens 77 that converts parallel light into focused light is fixed to the fixed member side member 72 (see, for example, Patent Document 1 below).

Japanese Patent Laid-Open No. 9-243851

  At the joint portion of the optical fiber cable, reflection occurs at the end face of the optical fiber cable, and light returns in the direction opposite to the traveling direction. Since such return light is a source of various obstacles in a system using an optical fiber cable, it is desirable to reduce it. For example, in the case of a sensor using an optical fiber cable, etc., it is necessary to pick up a fine optical signal and perform measurement. However, the measurement accuracy may be reduced due to the influence of such return light.

  The present invention has been made in view of the above-described problems of the prior art, and provides an optical rotary joint and an optical transmission system that can reduce the influence of reflected light (returned light) on an end face of an optical fiber cable. With the goal.

In order to solve the above-mentioned problems and achieve the object, an optical transmission system according to the present invention includes an end face of a fixed-body-side optical fiber cable that is non-rotatable and non-movable in an axial direction, and is rotatable and axially movable. In an optical transmission system in which the end face of the rotating body side optical fiber cable that is impossiblely supported faces coaxially and transmits information between the optical fiber cables, the end face of the fixed body side optical fiber cable and the end face of the rotating body side optical fiber cable An optical fiber member is provided between the optical fiber member and the axial end of the optical fiber member so that the optical fiber member cannot move in the axial direction, and the other end surface of the optical fiber member is in contact with the end surface of the rotating body side optical fiber cable. The end face of the optical fiber cable on the fixed body side faces the optical fiber. Among the other end surface of the bar member and the end face of the fixed body side optical fiber cables, at least one is provided with an inclined surface having an inclination with respect to the orthogonal plane orthogonal to the rotation axis, characterized in that.
The optical transmission system according to the present invention is an optical transmission system in which a rotating body side optical fiber cable and a fixed body side optical fiber cable are connected by an optical rotary joint at a joint between a wiring provided on the rotating body and a wiring provided on the fixed body. The optical rotary joint is attached to the fixed body and supports the fixed body side optical fiber cable, and is supported by the fixed body side member so as to be rotatable on a rotating shaft. A rotating member side member that supports the rotating member side member, and the rotating member side member extends the optical fiber member on the rotating shaft, and the end surface of the rotating member side optical fiber cable and the The optical fiber with one end face of the optical fiber member in contact with the optical fiber The member is supported so as not to move in the direction of the rotation axis, and the fixed member side member faces the other end surface of the optical fiber member on the rotation axis and is separated from the other end surface. The fixed body side optical fiber cable is supported so as not to move in the direction of the rotation axis, and at least one of the other end face of the optical fiber member and the end face of the fixed body side optical fiber cable is orthogonal to the rotation axis. An inclined surface having an inclination with respect to the orthogonal plane is provided.
The optical rotary joint according to the present invention is an optical rotary joint that connects a rotating body side optical fiber cable and a fixed body side optical fiber cable at a joint between a wiring provided on the rotating body and a wiring provided on the fixed body, A fixed body side member attached to the fixed body and supporting the fixed body side optical fiber cable, a rotating body side member supported by the fixed body side member so as to be rotatable on a rotation axis, and supporting the rotating body side optical fiber cable, and the rotation An optical fiber member supported by a body-side member, and the rotating body-side member extends the optical fiber member on the rotation shaft, and contacts an end surface of the rotating-body-side optical fiber cable and one end surface of the optical fiber member. In this state, the optical fiber member is supported so as not to move in the direction of the rotation axis. The fixed member-side member moves the fixed member-side optical fiber cable in the direction of the rotation axis with the end surface of the fixed-unit-side optical fiber cable directed toward the other end surface of the optical fiber member on the rotation axis and away from the other end surface. It is characterized by being incapable of supporting.

According to the optical rotary joint and the optical transmission system according to the present invention, at least one of the other end surface of the optical fiber member and the end surface of the fixed body side optical fiber cable is inclined with respect to the orthogonal plane orthogonal to the rotation axis. Since the surface is provided, it is possible to reduce the influence of reflected light (returned light) on the end surface of the optical fiber cable.
In addition, according to the optical rotary joint of the present invention, since the optical fiber member that contacts the end face of the rotating body side optical fiber cable and one end face and separates the other end face from the end face of the fixed body side optical fiber cable is provided. Without providing such a lens, it is possible to connect the optical fiber at the rotation connecting portion, and the transmission efficiency of the optical signal can be improved.

It is an outline side view of optical rotary joint 20 used for optical transmission system 10 concerning an embodiment. 3 is a cross-sectional view of the optical rotary joint 20. FIG. It is explanatory drawing which showed typically the example of application of the optical transmission system 10 concerning embodiment. FIG. 4 is an enlarged view of a portion where the end surface 110b of the fixed body side optical fiber cable 110 and the other end surface 206b of the optical fiber member 206 face each other. It is a front view of each end surface in FIG. It is explanatory drawing which showed typically the reflection in an optical fiber edge part. FIG. 6 is an enlarged view of a portion facing an optical fiber end face in the second embodiment. It is explanatory drawing which shows an example of a structure of the optical rotary joint 70 concerning a prior art.

  Exemplary embodiments of an optical transmission system and an optical rotary joint according to the present invention will be explained below in detail with reference to the accompanying drawings.

(Embodiment 1)
FIG. 1 is an external side view of an optical rotary joint 20 used in the optical transmission system 10 according to the embodiment, and FIG. 2 is a cross-sectional view of the optical rotary joint 20. The optical transmission system 10 according to the embodiment connects the rotating body-side optical fiber cable and the fixed body-side optical fiber cable by an optical rotary joint at a joint portion between the wiring provided in the rotating body and the wiring provided in the fixed body.

  FIG. 3 is an explanatory diagram schematically illustrating an application example of the optical transmission system 10 according to the embodiment. In the optical transmission system 10, the optical rotary joint 20 is supported by a bearing (not shown) provided at the shaft end of the cable winding drum 102. The cable take-up drum 102 is provided, for example, on the base end side of an extendable boom 106 provided in a construction machine or the like, and the rotary body side optical fiber cable 112 is taken up and fed out by rotating the cable take-up drum 102. . One end of the rotator-side optical fiber cable 112 is connected to one end of the optical rotary joint 20 disposed at the rotation center of the cable winding drum 102 and the other end is connected to the rotation-side control device 116 on the distal end side of the telescopic boom. The telescopic boom is stretched between the base end side and the telescopic boom distal end side 108.

  One end of the fixed body side optical fiber cable 110 is connected to the other end of the optical rotary joint 20. The other end portion of the fixed body side optical fiber cable 110 is connected to a fixed side control device 114 including an electric signal output device and an electric / optical converter. The fixed-side control device 114 outputs a control signal for the telescopic boom 106 and the like. The control signal is transmitted through the optical fiber cables 110 and 112 and is transmitted to the rotation-side control device 116.

Returning to the description of FIGS. 1 and 2, FIG. 2 is a cross-sectional view taken along line AA ′ of FIG. 1. In addition, the state to which the rotary body side optical fiber cable 112 and the fixed body side optical fiber cable 110 were connected is shown in figure.
The optical rotary joint 20 includes a stationary member side member 202, a rotating member side member 204, and an optical fiber member 206. The fixed body side member 202 is attached to the fixed body and supports the fixed body side optical fiber cable 110. In the present embodiment, the fixed body is a portion on the support member side that supports the cable winding drum 102, and the fixed body side member 202 is attached to the outside of the bearing that supports the cable winding drum 102 in the screw hole 202a. The

  The fixed body side member 202 is provided with an insertion port 202b of the fixed body side optical fiber cable 110, and the connector portion 110a of the fixed body side optical fiber cable 110 is inserted into the insertion port 202b. When the connector part 110a is inserted, the fixed part side optical fiber cable 110 is fixed by fitting the connector part 110a to the fitting part 202c (convex part) forming the insertion port 202b. A guide portion 202e for guiding the optical fiber portion (core and clad) 110c of the fixed body side optical fiber cable 110 to a predetermined position is provided in the insertion port 202b, and the end surface 110b of the fixed body side optical fiber cable 110 is fixed at the predetermined position. . The surface of the stationary member side member 202 opposite to the insertion port 202b is a cylindrical portion 202d, and the rotating member side member 204 is rotatably supported therein.

  The rotating body side member 204 is supported by the fixed body side member 202 so as to be rotatable on a rotating shaft, and supports the rotating body side optical fiber cable 112. The rotating body side member 204 includes a cylindrical portion 204e and a flange portion 204a, and the cylindrical portion 204e is supported in the cylindrical portion 202d of the fixed body side member 202 by bearings 208 (two in FIG. 2). Further, the flange portion 204 a of the rotating body side member 204 is attached to the inside of the bearing that supports the cable winding drum 102.

  The rotator-side member 204 is provided with an insertion port 204b of the rotator-side optical fiber cable 112, and the connector portion 112a of the rotator-side optical fiber cable 112 is inserted into the insertion port 204b. When the connector part 112a is inserted, the rotating body side optical fiber cable 112 is fixed by fitting the connector part 112a to the fitting part 204c (convex part) forming the insertion port 204b. By this fixing, the rotation of the rotating body side optical fiber cable 112 is transmitted to the cylindrical portion 204e of the rotating body side member 204, and the cylindrical portion 204e of the rotating body side member 204 rotates in the cylindrical portion 202d of the fixed body side member 202.

  Further, a guide portion 204d for guiding the optical fiber portion (core and clad) 112c in the rotating body side optical fiber cable 112 to a predetermined position is provided in the insertion port 204b, and the end surface 112b of the rotating body side optical fiber cable 112 is at the predetermined position. Fixed.

  Here, the rotator-side member 204 fixes the end face 112b of the rotator-side optical fiber cable 112 so as to be immovable in the rotation axis direction on the rotation axis B toward one of the rotation axis B directions. Moreover, the fixed body side member 202 fixes the end surface 112b of the fixed body side optical fiber cable 110 so that it cannot move in the rotation axis direction on the rotation axis B toward the other of the rotation axis B directions. That is, the end surface 112b of the rotating body side optical fiber cable 112 and the end surface 110b of the fixed body side optical fiber cable 110 are arranged and fixed so as to face each other on the rotation axis B.

  In the cylindrical portion 204e of the rotating body side member 204, an optical fiber member 206 extending on the rotating shaft B and contacting the end surface 112b of the rotating body side optical fiber cable 112 and one end surface 206a is disposed so as not to be movable in the axial direction. Has been. The optical fiber member 206 has the same diameter as the optical fibers (core and clad) in the rotating body side optical fiber cable 112 and the fixed body side optical fiber cable 110. Since the optical fiber member 206 is disposed without a gap in the cylindrical portion 204e of the rotating body side member 204, it rotates together with the cylindrical portion 204e. That is, the optical fiber member 206 rotates together with the rotation of the rotating body side optical fiber cable 112 that contacts one end face 206a thereof.

  On the other hand, the other end surface 206b of the optical fiber member 206 is disposed to face the end surface 110b of the fixed body side optical fiber cable 110, and the end surface 110b of the fixed body side optical fiber cable 110 and the other end surface 206b of the optical fiber member are separated from each other. Thereby, the fixed state of the fixed body side optical fiber cable 110 can be maintained without the rotation on the rotating body side member 204 side being transmitted to the fixed body side optical fiber cable 110.

  4 is an enlarged view of a portion where the end surface 110b of the fixed body side optical fiber cable 110 and the other end surface 206b of the optical fiber member 206 are opposed to each other. FIG. 5 is a front view of each end face in FIG. The end face 110b of the fixed-body-side optical fiber cable 110 and the other end face 206b of the optical fiber member 206 are respectively in relation to the flat end faces 110X and 206X that extend on the orthogonal plane D to the rotation axis B and the orthogonal plane D to the rotation axis B, respectively. And inclined surfaces 110Y and 206Y having a predetermined angle θ. The predetermined angle θ is, for example, about 4 ° to 8 °. The reason for providing such an inclination is to reduce the return light due to reflection at each end face (the end face 110b of the fixed body side optical fiber cable 110 and the other end face 206b of the optical fiber member 206).

  FIG. 6 is an explanatory view schematically showing reflection at the end portion of the optical fiber. 6A shows a case where the end face S of the optical fiber FC is formed only by a flat end face orthogonal to the rotation axis B (no inclination), and FIG. 6B shows a flat end face X and an inclined face Y on the end face S of the optical fiber FC. Is provided (with inclination). In FIG. 6A without an inclined surface, the reflected light on the end surface S returns back to the optical signal generation direction side in the optical fiber FC. Such return light (reflection attenuation amount) is about 25 dB (about 5/100) even when the non-reflective coating is applied to the end face S, for example. As described above, such return light causes various obstacles in a system using an optical fiber cable.

  Therefore, in the optical transmission system 10 according to the present invention, as shown in FIG. 6B, the flat end surface X and the inclined surface Y are provided on the end surface S of the optical fiber FC. With such a configuration, the return loss at the end face S can be about 50 dB (about 1 / 100,000). Thereby, the influence of the return light in the optical transmission system 10 can be reduced.

  As shown in FIG. 4, in the present embodiment, the inclination of the end face is provided in a region including a part of each end face and the end face of the core region C of the optical fiber. That is, the end surface 110b of the fixed body side optical fiber cable 110 and the other end surface 206b of the optical fiber member 206 have shapes as shown in FIG. Thus, by providing the inclined surface Y only in a partial region including all the end surfaces of the core region C among the end surfaces of the optical fiber, that is, on the end surface 206b of the optical fiber member 206 and the end surface 110b of the fixed body side optical fiber cable 110, By providing a flat end surface extending on the orthogonal plane D orthogonal to the rotation axis B, the distance between the core end surfaces can be shortened compared to the case where all the end surfaces of the optical fiber are inclined surfaces. The influence can be reduced.

  The distance Z between the end face 110b of the fixed body side optical fiber cable 110 and the other end face 206b of the optical fiber member 206 is, for example, not more than the diameter of the core of the optical fiber cable. For example, when the fixed body side optical fiber cable 110 and the rotating body side optical fiber cable 112 are single mode fibers, the diameter thereof is, for example, 9 μm. In this case, the outgoing light from the end face 110b of the fixed-body-side optical fiber cable 110 is spread, and the spot is about 82% of the outgoing light at a point 5 μm from the end face 110b and about 70% of the outgoing light at a point 10 μm. In order to reduce the influence of such diffusion, in this embodiment, the distance Z between the end surface 110b of the fixed-body-side optical fiber cable 110 and the other end surface 206b of the optical fiber member 206 is set to a single mode fiber having a core diameter of 9 μm. The thickness was 5 μm.

  As described above, according to the optical rotary joint 20 according to the embodiment, the end surface 112b of the rotating body side optical fiber cable 112 and the one end surface 206a are in contact with each other, and the other end surface 206b is connected to the end surface 110b of the fixed body side optical fiber cable 110. Since the optical fiber member 206 extending on the rotation shaft fixed at a distance is provided, it is possible to connect the optical fiber at the rotary connection portion without providing a lens as in the prior art, and to improve the transmission efficiency of the optical signal. it can.

  Further, according to the optical rotary joint 20 and the optical transmission system 10 according to the present invention, the end surface 110b of the fixed body side optical fiber cable 110 and the other end surface 206b of the optical fiber member 206 which are provided apart from each other are respectively connected to the rotation axis B. Since the inclined surface having an inclination with respect to the orthogonal surface D is provided, the reflected light (returned light) at the end surface of the optical fiber cable can be reduced. Specifically, for example, when the optical transmission system 10 is applied to a sensor using an optical fiber cable, the measurement accuracy can be improved by measuring the fine optical signal accurately by reducing the influence of the return light. .

  Further, according to the optical rotary joint 20 and the optical transmission system 10 according to the present invention, the inclined surfaces of the other end surface 206b of the optical fiber member 206 and the end surface 110b of the fixed body side optical fiber cable 110 are regions including all the end surfaces of the core region of the optical fiber. Therefore, the distance between the core end faces can be shortened compared with the case where all the end faces of the optical fiber are provided with an angle, and the influence of the diffusion of the emitted light can be reduced.

  Further, according to the optical rotary joint 20 and the optical transmission system 10 according to the present invention, the distance between the end surface 110b of the fixed body side optical fiber cable 110 and the other end surface 206b of the optical fiber member 206 is equal to or less than the diameter of the core of the optical fiber cable. . Thereby, the influence by the spreading | diffusion of an emitted light can be reduced and the transmission efficiency of an optical signal can be improved.

(Embodiment 2)
In the first embodiment, the inclined surfaces are provided on both the end surface 110 b of the fixed body side optical fiber cable 110 and the other end surface 206 b of the optical fiber member 206. In the second embodiment, an inclined surface is provided only on one of the end surface 110b of the fixed body side optical fiber cable 110 or the other end surface 206b of the optical fiber member 206, and the other is a flat end surface extending on an orthogonal surface orthogonal to the rotation axis. Only to form. In the second embodiment, the configuration other than the end face shapes of the fixed body side optical fiber cable 110 and the optical fiber member 206 is the same as that of the first embodiment, and thus detailed description thereof is omitted.

  FIG. 7 is an enlarged view of a portion facing the end face of the optical fiber in the second embodiment. In FIG. 7, only the end face 110 b of the fixed-body-side optical fiber cable 110 has a flat end face 110 </ b> X extending on a plane D perpendicular to the rotation axis B and an inclination having a predetermined angle θ with respect to the plane D perpendicular to the rotation axis B. A surface 110 </ b> Y is formed, and the other end surface 206 b of the optical fiber member 206 is a flat end surface 206 </ b> X extending on a plane D perpendicular to the rotation axis B.

  As described above, the inclined surface is provided only on one of the end faces of the fixed body side optical fiber cable 110 or the optical fiber member 206 in order to prevent variations in the incident position of the light emitted from the one end face. Since the emission angle of the emitted light emitted from the end surface provided with the inclined surface is inclined, when an inclined surface is provided on any of the end surfaces of the fixed body side optical fiber cable 110 and the optical fiber member 206, the incident light is incident on the incident position. Variations are likely to occur. As shown in FIG. 7, by providing an inclined surface only on either the end surface 110b of the fixed-body-side optical fiber cable 110 or the other end surface 206b of the optical fiber member 206, the incident position of the light emitted from one end surface can be changed. Can be reduced.

  7 illustrates the case where an inclined surface is formed on the end surface 110b of the fixed body side optical fiber cable 110, the same effect can be obtained even if an inclined surface is formed on the other end surface 206b of the optical fiber member 206. . Further, a non-reflective coating may be applied to the end surface on which the inclined surface is not formed (the other end surface 206b of the optical fiber member 206 in FIG. 7).

  DESCRIPTION OF SYMBOLS 10 ... Optical transmission system, 20 ... Optical rotary joint, 110 ... Fixed body side optical fiber cable, 110a ... Connector part, 110b ... End surface, 112 ... Rotating body side optical fiber cable, 112a ... Connector part, 112b ... End surface, 112X: Flat surface, 112Y: Inclined surface, 202: Fixed member side member, 202a: Screw hole, 202b: Insertion port, 202c: Fitting portion, 202d: Tubular portion, 202e ... Guide portion, 204... Rotating member side member, 204a. Flange portion, 204b .. Insertion port, 204c .. Fitting portion, 204d... Guide portion, 204e. 206b: end face, 206X: flat surface, 206Y: inclined surface, 208: bearing, B: rotating shaft, C: core region, D ... orthogonal plane, FC ...... fiber, S ...... end surface, X ...... flat surface, Y ...... inclined surface.

Claims (9)

The end face of the fixed-body-side optical fiber cable that is supported so that it cannot rotate but cannot move in the axial direction and the end face of the rotating-body-side optical fiber cable that is supported so that it can rotate but cannot move in the axial direction face each other on the same axis. In an optical transmission system that transmits information between
An optical fiber member is provided between the end face of the fixed body side optical fiber cable and the end face of the rotating body side optical fiber cable so as to be non-movable in the axial direction coaxially with the cables,
With the one end face of the optical fiber member and the end face of the rotating body side optical fiber cable in contact, the other end face of the optical fiber member and the end face of the fixed body side optical fiber cable face each other,
At least one of the other end surface of the optical fiber member and the end surface of the fixed body side optical fiber cable includes an inclined surface that is inclined with respect to an orthogonal surface orthogonal to the rotation axis.
An optical transmission system characterized by that.   2. The optical transmission system according to claim 1, wherein the other end surface of the optical fiber member and the end surface of the fixed body side optical fiber cable both include the inclined surface.   Of the other end surface of the optical fiber member and the end surface of the fixed body side optical fiber cable, one is provided with the inclined surface and the other is formed of a flat end surface extending on an orthogonal surface orthogonal to the rotation axis. The optical transmission system according to claim 1.   The optical transmission system according to claim 1, wherein the end surface having the inclined surface includes a flat end surface that extends on an orthogonal surface orthogonal to the rotation axis.   The optical transmission system according to any one of claims 1 to 4, wherein the inclined surface is formed in a region including all end surfaces of the core region of the optical fiber member.   The optical transmission system according to claim 1, wherein an inclination of the inclined surface with respect to the orthogonal surface is 4 ° to 8 °. An optical transmission system in which a rotating body side optical fiber cable and a fixed body side optical fiber cable are connected by an optical rotary joint at a joint between a wiring provided on a rotating body and a wiring provided on a fixed body,
The optical rotary joint is attached to the fixed body and supports the fixed body side optical fiber cable, the fixed body side member that supports the fixed body side optical fiber cable, and is rotatably supported on the rotating body on the fixed body side member and supports the rotary body side optical fiber cable. A rotating member-side member; and an optical fiber member supported by the rotating member-side member, the rotating member-side member extending the optical fiber member on the rotating shaft, and an end surface of the rotating member-side optical fiber cable and the optical fiber member. The optical fiber member is supported so as not to move in the direction of the rotation axis in a state where one end face is in contact with the fixed body side member, and the end face of the fixed body side optical fiber cable is placed on the other end of the optical fiber member on the rotation axis. Toward the end surface of the fixed body and spaced apart from the other end surface, It is immovably supported in the rolling direction,
At least one of the other end surface of the optical fiber member and the end surface of the fixed body side optical fiber cable includes an inclined surface that is inclined with respect to an orthogonal surface orthogonal to the rotation axis.
An optical transmission system characterized by that. An optical rotary joint that connects the rotating body side optical fiber cable and the fixed body side optical fiber cable at a joint between the wiring provided on the rotating body and the wiring provided on the fixed body,
A fixed body side member attached to the fixed body and supporting the fixed body side optical fiber cable;
A rotating body side member that is rotatably supported on the rotating body on the fixed body side member and supports the rotating body side optical fiber cable;
An optical fiber member supported by the rotating body side member,
The rotating member side member extends the optical fiber member on the rotating shaft, and moves the optical fiber member in the rotating shaft direction in a state where the end surface of the rotating member side optical fiber cable and one end surface of the optical fiber member are in contact with each other. Support impossible,
The fixed body side member is configured such that the end surface of the fixed body side optical fiber cable faces the other end surface of the optical fiber member on the rotation shaft and is separated from the other end surface so that the fixed body side optical fiber cable cannot move in the rotation axis direction. Supporting
Optical rotary joint characterized by that. The other end surface of the optical fiber member includes an inclined surface having an inclination with respect to an orthogonal surface orthogonal to the rotation axis.
The optical rotary joint according to claim 8.

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