JP2012198339A - Optical fiber wiring structure and manufacturing method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical fiber wiring structure which allows coated optical fibers to be efficiently wired on a substrate.SOLUTION: An optical fiber wiring structure A includes a substrate and coated optical fibers 20 which are wired on the substrate to form a circular pattern where linear parts 20a and 20b and curved parts 20c extend alternately continuously in parallel. With respect to the circular pattern, junction parts J between linear parts and curved parts in an arbitrary round are located so as to more project than those in more inner rounds in extension directions of linear parts.

Description

  The present invention relates to an optical fiber wiring structure and a manufacturing method thereof.

  In a device using a long optical fiber core such as a fiber laser or an optical fiber amplifier, for example, a device in which an optical fiber core is wound around a reel is incorporated in the device, or on a resin sheet as a base material. An optical fiber wiring sheet in which optical fiber cores are laid so as to form a predetermined loop pattern is incorporated in the apparatus.

  In Patent Document 1, an optical fiber wiring sheet in which optical fiber core wires arranged in a track shape are held on a flexible rectangular resin sheet, which is positioned on the innermost side of the track shape. The radius of curvature of the semicircular part is set to 16 mm, the radius of curvature is formed so as to gradually increase from the inner side to the outer side, the length of the straight part is set to 32.5 mm, and the optical fiber core A line whose total length is set to 21 m is disclosed.

  Patent Document 2 discloses a method for manufacturing an optical fiber wiring sheet, in which an ultraviolet curable resin is applied so as to cover the surface of an optical fiber, and ultraviolet rays are applied to the resin so that an uncrosslinked portion is formed on the resin surface side. After configuring the remaining optical fiber cores, the optical fiber core wires are brought into close contact with each other and wound up on a mold, and then irradiated with ultraviolet rays again to cure the uncrosslinked resin. It is disclosed that the wires are bonded and integrated.

  In Patent Document 3, for the purpose of heat dissipation of the optical fiber, the optical fiber is wound in a circular shape, and is sandwiched between the first and second members made of a material having high thermal conductivity. It is disclosed to fill a material with high flexibility and high thermal conductivity.

JP 2001-326406 A JP 2000-329944 A JP 2001-274489 A

  An object of the present invention is to efficiently route an optical fiber core wire on a substrate.

The optical fiber wiring structure of the present invention is
A substrate;
On the base material, an optical fiber core wire arranged so as to form a circular pattern in which linear portions and curved portions alternately and continuously extend in parallel,
With
The loop pattern is positioned such that the connecting portion between the straight line portion and the curved portion of an arbitrary circumference protrudes in the extending direction of the straight portion from the connecting portion between the straight line portion and the curved portion inside the circumference. Yes.

In the method for manufacturing an optical fiber wiring structure according to the present invention, an optical fiber core wire is laid on a substrate so as to form a circular pattern in which straight portions and curved portions are alternately connected and extend in parallel. Because
The loop pattern is positioned such that the connecting portion between the straight line portion and the curved portion of any circumference protrudes in the extending direction of the straight portion from the connecting portion between the straight line portion and the curved portion inside the circumference. Shall.

  According to the present invention, the circulation pattern of the optical fiber core wire is such that the connecting portion between the linear portion and the curved portion of an arbitrary circumference is more straight than the connecting portion between the linear portion and the curved portion of the inner circumference. Since it is positioned so as to protrude in the extending direction of the portion, the length of the wiring per unit area can be increased, and as a result, the optical fiber core can be efficiently wired on the substrate.

1 is a perspective view showing an optical fiber wiring structure according to Embodiment 1. FIG. 1 is a plan view showing an optical fiber wiring structure according to Embodiment 1. FIG. It is an enlarged plan view of the principal part of the optical fiber wiring structure which concerns on Embodiment 1. FIG. It is IV-IV expanded sectional drawing in FIG. It is a perspective view of an optical fiber core wire. It is a perspective view of a wiring apparatus. It is a perspective view which shows the optical fiber wiring structure which concerns on Embodiment 2. FIG. It is an expanded sectional view equivalent to FIG. 4 in Embodiment 1 of the optical fiber wiring structure which concerns on Embodiment 2. FIG. It is a side view which shows another modification of an optical fiber wiring structure. It is an enlarged plan view of the principal part of the conventional optical fiber wiring structure.

  Hereinafter, embodiments will be described in detail based on the drawings.

(Embodiment 1)
1 to 4 show an optical fiber wiring structure A according to the first embodiment. The optical fiber wiring structure A according to the first embodiment is used for applications such as a fiber laser and an optical fiber amplifier.

  In the optical fiber wiring structure A according to the first embodiment, the heat sink 10 constitutes a base material.

  The heat sink 10 is integrated with the main body plate 11 so that the surface of the rectangular main body plate 11 is a flat surface, and a plurality of plate-like fins 12 extend in the normal direction at intervals in the long side direction on the rear surface. And has a comb shape when viewed from the side. The material forming the heat sink 10 is preferably a metal having high thermal conductivity, and examples of such a material include aluminum and copper. The heat sink 10 may be coated with an anodized film colored in black or the like in order to improve corrosion resistance and wear resistance, and in order to improve heat dissipation characteristics. The main body plate 11 has, for example, a length of 50 to 300 mm, a width of 50 to 250 mm, and a thickness of 1 to 10 mm. For example, the fin 12 has a length extending from the main body plate 11 of 2 to 300 mm and a thickness of 5 to 50 mm. As a commercially available heat sink 10, for example, model number: EM / B / 150 (thermal resistance 0.64 ° C./W) manufactured by AAVID, or model number: OK278 / B / 150 (thermal resistance 0.48 ° C./W) Etc. The shapes, materials, and dimensions of the main body plate 11 and the fins 12 of the heat sink 10 are not limited to these, and may have other configurations.

  In the optical fiber wiring structure A according to the first embodiment, the optical fiber core wire 20 is wired on the surface of the main body plate 11 of the heat sink 10 so as to form a circular pattern via an adhesive layer 30 (adhesive). .

  FIG. 5 shows the optical fiber core wire 20.

  The optical fiber core wire 20 is constituted by an optical fiber 21 and a coating layer 22 covering the optical fiber 21. The optical fiber core wire 20 has a length of 3 to 100 m and a core wire diameter of 50 to 1000 μm, for example.

  The optical fiber 21 has a core 21a having a relatively high refractive index at the center of the fiber and a clad 21b having a relatively low refractive index covering the core 21a. The material forming the optical fiber 21 is typically quartz, but may be a resin such as an acrylic resin if the heat resistance is allowed depending on the use conditions, and the core 21a is quartz and the clad 21b is resin. May be. For example, the core 21a may be doped with a rare earth element such as erbium (Er), yttrium (Y), neodymium (Nd) as a dopant, or may be doped with germanium (Ge), aluminum (Al), or the like. It may be. The clad 21b may be doped with a dopant, or may not be doped with a dopant. Examples of the dopant in the former case include boron (B) and fluorine (F) that lower the refractive index. It is done. The optical fiber 21 has, for example, a fiber diameter of 50 to 800 μm, a core diameter of 3 to 600 μm, and a clad 21b thickness of 25 to 100 μm. However, from the viewpoint of improving the heat dissipation of the optical fiber 21, the fiber diameter of the optical fiber 21 is preferably 125 μm or more. Further, the optical fiber 21 may be a combination of a plurality of cores and claddings for passing light of a plurality of wavelengths, or a cross section having a shape other than a circle such as a D-shape or a polygon. Such optical fiber 21 is described in, for example, Japanese Patent Application Laid-Open No. 2002-151664, “Double-clad fiber laser with 30 mW output power”, OSA Trends in Optics and Photonics, vol. 16, p137-140 (1997). Is disclosed.

  As a material for forming the covering layer 22, for example, an ultraviolet curable acrylic resin can be cited as a general-purpose material, but among the resins, a thin polyimide resin is preferable from the viewpoint of efficiently dissipating heat generated by the optical fiber 21. From the viewpoint of efficiently dissipating heat generated by the optical fiber 21, metals such as aluminum, copper, and gold having high thermal conductivity are preferable. The thickness of the coating layer 22 is, for example, 3 to 100 μm in the case of resin, and 30 to 200 μm in the case of metal.

  A pair of optical fiber core wires 20 extends along the long side of the main body plate 11 in each circumference so that the loop pattern surrounds a loop formed in the center portion in the length direction of the optical fiber core wire 20. The opposing straight portions 20a, a pair of opposing straight portions 20b extending along the short side of the main body plate 11, and the long-side straight portions 20a and the short-side straight portions arranged at the corners of the main plate 11 A substantially rectangular shape having four curved portions 20c connecting 20b is formed, and the straight portions 20a, 20b and the curved portions 20c are alternately connected to each other and circulate outward (for example, 6 to 200 laps). It is a pattern.

  As shown in FIG. 3, this loop pattern is such that all the joint portions J between the straight portions 20a and 20b and the curved portion 20c of any circumference are connected to the straight portions 20a and 20b and the curved portion 20c of the inner circumference. It is positioned so as to protrude in the extending direction of the straight portions 20a and 20b rather than the connecting portion J. Thereby, in this circuit pattern, the length of the linear portions 20a and 20b of an arbitrary circumference is longer than the length of the linear portions 20a and 20b of the inner circumference. The lengths of the straight portions 20a and 20b of the circulation pattern are, for example, 30 to 200 mm.

  According to the optical fiber wiring structure A according to the first embodiment, as shown in FIG. 3, the loop pattern of the optical fiber core wire 20 is a joint portion between the linear portions 20 a and 20 b and the curved portion 20 c of an arbitrary circumference. 10 is positioned so as to protrude in the direction in which the straight portions 20a and 20b extend from the joint portion J between the straight portions 20a and 20b and the curved portion 20c on the inner circumference. As in the configuration of the optical fiber wiring structure A ′, in the optical fiber core wire 20 ′ wired so as to form a circulation pattern on the heat sink 10 ′, linear portions 20a ′ and 20b ′ of arbitrary circumferences and curves The joint portion J ′ with the portion 20c ′ is the same as the joint portion J ′ between the straight line portions 20a ′ and 20b ′ and the curved portion 20c ′ on the inner side in the extending direction of the straight portions 20a ′ and 20b ′. As compared with the case where is positioned at the position, the wiring length per unit area can be made long, the result can be wired optical fiber 20 efficiently on the heat sink 10. Specifically, for example, in the optical fiber wiring sheet disclosed in FIG. 1 of Patent Document 1, a 21 m optical fiber core wire is wired on a rectangular resin sheet as a base material. In the optical fiber wiring structure A according to the first embodiment, if the area of the surface of the rectangular main body plate 11 of the heat sink 10 as the base material is the same as that disclosed in Patent Document 1, the optical fiber core The wire 20 can be laid out about 8% longer. Therefore, when the optical fiber core wires 20 having the same length are wired, the size of the base material can be reduced.

  As shown in FIG. 3, the curved pattern 20 c of each circumference is formed in an arc having the same radius of curvature at each corner of the main body plate 11. Thus, by arranging the curved portion 20c at the corner of the rectangular main body plate 11, it is possible to secure a long wiring length by the above configuration, particularly by effectively utilizing the dead space at the corner. . The radius of curvature of the curved portion 20c of the circulation pattern is, for example, 15 to 150 mm.

  In this circular pattern, in any of the straight portions 20a, 20b and the curved portion 20c, the optical fiber core wires 20 adjacent to each other and extending in parallel are not in contact with each other, and as shown in FIG. 20 are provided so as to extend in parallel with each other at a distance d. Thus, since the optical fiber core wires 20 are wired so as to form a circular pattern extending in parallel with each other at a distance d, heat is not stored between the optical fiber core wires 20 and the base material is also formed. As the heat sink 10, a high heat dissipation property can be obtained. As a result, high power can be achieved for fiber laser applications, and stabilization of characteristics can be achieved for optical fiber amplifier applications. The interval d between the optical fiber cores 20 may be wide or narrow along the loop pattern, but the optical fiber core wires 20 are efficiently arranged in a limited space and the optical fiber core wires 20 are arranged. From the viewpoint of efficiently radiating the heat generated by the optical fiber 21 by eliminating the heat storage between them, it is preferable to be constant along the loop pattern. The distance d between the optical fiber cores 20 efficiently disposes the optical fiber core wires 20 in a limited space and eliminates heat storage between the optical fiber core wires 20 to efficiently generate heat from the optical fiber 21. From the viewpoint of heat dissipation, it is preferably 0.2 to 3.0 times the core wire diameter of the optical fiber core wire 20 and more preferably 0.5 to 1.5 times.

  The pair of optical fiber core wires 20 that form the outermost periphery of the loop pattern are drawn to the outside of the heat sink 10, and one is configured as an input end and the other as an output end.

  Examples of the material for forming the adhesive layer 30 include a silicone adhesive, a rubber adhesive, an acrylic adhesive, and the like. The adhesive layer 30 may be added with a filler such as metal powder or carbon that enhances thermal conductivity. The thickness of the adhesive layer 30 is preferably as thin as possible from the viewpoint of efficiently dissipating heat generated by the optical fiber 21 to the heat sink 10, and is, for example, 20 to 100 μm. The optical fiber core wire 20 may be wired through an adhesive layer instead of the adhesive layer 30. Examples of the material for forming the adhesive layer include a thermosetting resin adhesive and a thermoplastic resin system. Examples thereof include an adhesive and an elastomer-based adhesive.

  In the optical fiber wiring structure A according to the first embodiment, a fluid-solidified filler 40 is filled between the optical fiber core wires 20. The filler 40 enhances heat transfer from the optical fiber 21. Here, the fluid-solidified filler 40 refers to a filler material in which the raw material has a liquid or paste fluidity and is solidified by reaction or solvent volatilization.

  Examples of the fluid-solidified filler 40 include thermosetting resins such as silicone rubber and epoxy resin, and thermoplastic resins. Of these, silicone rubber having excellent thermal conductivity is preferable from the viewpoint of efficiently dissipating heat generated by the optical fiber 21. The viscosity of the filler 40 before solidification is preferably 50 to 200 Pa · s from the viewpoint of filling processability. The hardness of the filler 40 after solidification (durometer A, based on JIS K 6249) is preferably 20 to 80 from the viewpoint of following the dimensional change due to heat of the optical fiber core 20. The thermal conductivity (based on ISO 22007-2) of the filler 40 after solidification is preferably 0.2 to 2.5 W / m · K from the viewpoint of efficiently dissipating heat generated by the optical fiber 21. Examples of suitable commercially available filler 40 include silicone rubber (trade name: KE-4890, etc.) manufactured by Shin-Etsu Chemical Co., Ltd.

  In the optical fiber wiring structure A according to the first embodiment, the protective film 50 is provided so as to cover the surface of the main body plate 11 of the heat sink 10 from above the wired optical fiber core wire 20. The optical fiber core wire 20 is protected from the outside by the protective film 50.

  Examples of the material for forming the protective film 50 include resins such as polyethylene resin, polypropylene resin, and polyethylene terephthalate resin. The surface of the protective film 50 is tightly coated by the adhesiveness of the filler 40 filled between the optical fiber cores 20, but the surface may be tightly coated via an adhesive or an adhesive. The thickness of the protective film 50 is 25-200 micrometers, for example.

  Next, the manufacturing method of the optical fiber wiring structure A which concerns on Embodiment 1 is demonstrated.

  FIG. 6 shows a wiring device 100 used for manufacturing the optical fiber wiring structure A. The structure of the wiring device 100 is also disclosed in, for example, Japanese Patent Application Laid-Open Nos. 2002-31723, 2002-365447, and 2003-75654.

  In the wiring apparatus 100, a movable stage 120 is provided at the center of a rectangular base 110, and a support member 130 is erected at the center of one side of the base 110.

  The movable stage 120 includes a lower first linear movement stage 121 and an upper second linear movement stage 122.

  The first linear movement stage 121 includes a first fixing member 121a fixed on the base 110 and a first moving base 121b provided thereon. A guide convex portion 123 extending in the direction of arrow X in the drawing is provided on the upper surface side of the first fixing member 121a, while the guide convex portion 123 is engaged on the lower surface side of the first moving base 121b. A guide recess 124 is provided. The first moving base 121b is coupled to a motor (not shown), and by driving the first moving base 121b, the guide convex portion 123 and the guide concave portion 124 extend in the horizontal direction with respect to the first fixing member 121a, that is, It is configured to be able to reciprocate relatively in the direction of arrow X in the figure.

  The second linear moving stage 122 has the same structure as the first linear moving stage 121, and the moving direction is orthogonal to the moving direction of the first linear moving stage 121. That is, the second linear moving stage 122 includes a second fixing member 122a fixed on the first moving table 121b and a second moving table 122b provided thereon. On the upper surface side of the second fixing member 122a, a guide convex portion 125 extending in the direction of the arrow Y in the figure is provided, while on the lower surface side of the second moving base 122b, the guide convex portion 125 is engaged. A guide recess 126 is provided. The upper surface of the second moving table 122b is configured such that the base material B can be attached and detached, and when the base material B is installed, the upper surface for laying the optical fiber core wire 20 is in a substantially horizontal state. Has been. The second moving table 122b is coupled to a motor (not shown), and by driving the second moving table 122b, the guide convex portion 125 and the guide concave portion 126 extend in the horizontal direction with respect to the second fixing member 122a. It is configured to be able to reciprocate relatively in the direction of arrow Y in the figure. Note that the X direction and the Y direction are orthogonal to each other.

  The support member 130 is an L-shaped member that includes a leg 131 that rises vertically upward from the base 110 and an arm 132 that extends horizontally from the upper end of the leg 131 toward the center of the base 110. It consists of The wiring part 140 is attached to the tip of the arm part 132 so as to be positioned above the movable stage 120.

  The wiring section 140 accommodates an optical fiber bobbin (not shown) inside, and has a wiring head 141 at the lower end, and pulls out the optical fiber core wire F wound around the optical fiber bobbin to provide the wiring head. 141 is configured to be supplied from the core wire supply port. The wiring section 140 is configured to rotate around a rotation axis that is substantially perpendicular to the plane of the base 110 by a motor (not shown).

  As described above, in the wiring apparatus 100, the movable stage 120 moves the base material B in the two directions orthogonal to the X direction and the Y direction in the XY plane by the first and second linear movement stages 122, and moves. By supplying the optical fiber core wire F from the wiring portion 140 supported by the support member 130 on the base material B, the optical fiber core wire F is wired on the base material B in a predetermined circuit pattern. It is configured.

  When manufacturing the optical fiber wiring structure A according to the first embodiment, first, the adhesive layer 30 is formed by attaching an adhesive to the surface of the main body plate 11 of the heat sink 10 as the base material.

  Next, the heat sink 10 is installed on the movable stage 120 of the wiring apparatus 100 so that the surface of the main body plate 11 provided with the adhesive layer 30 faces upward.

  Subsequently, the heat sink 10 is moved in the XY plane by the movable stage 120, and the optical fiber core wire 20 is supplied from the wiring portion 140, so that a space d is provided on the main body plate 11 of the heat sink 10. The optical fiber core wire 20 is wired so as to form a predetermined circulation pattern extending in parallel.

  Then, the heat sink 10 is taken out from the wiring device 100, and the uncured liquid or paste filler 40 is filled between the optical fiber core wires 20 on the surface side of the main body plate 11 of the heat sink 10. Apply and cure it.

  Finally, the optical fiber wiring structure A according to the first embodiment is obtained by covering the surface of the main body plate 11 of the heat sink 10 so as to cover the surface of the main body plate 11 of the optical fiber core wire 20 and closely adhering it. Can do.

(Embodiment 2)
7 and 8 show an optical fiber wiring structure A (optical fiber sheet) according to the second embodiment. The optical fiber wiring structure A according to the second embodiment is also used for applications such as a fiber laser and an optical fiber amplifier. In addition, the part of the same name as Embodiment 1 is shown with the same code | symbol as Embodiment 1. FIG.

  In the optical fiber wiring structure A according to the second embodiment, a rectangular resin sheet 60 forms a base material.

  Examples of the material forming the resin sheet 60 include resins such as polyethylene resin, polypropylene resin, and polyethylene terephthalate resin. The thickness of the resin sheet 60 is, for example, 0.1 to 0.8 mm.

  In the optical fiber wiring structure A according to the second embodiment, since the base material is the resin sheet 60, it is possible to reduce the weight and the size of the optical fiber amplifier and the like.

  The other optical fiber core wire 20 and its wiring pattern, the configuration of the adhesive layer 30, the filler 40, and the protective film 50, and the operational effects thereof are the same as those of the first embodiment.

(Other embodiments)
In the first and second embodiments, in all the joint portions J between the straight portions 20a and 20b and the curved portion 20c, the joint portion J between the arbitrary straight portions 20a and 20b and the curved portion 20c is located on the inner side. The linear portions 20a and 20b and the curved portion 20c are arranged so as to protrude from the connecting portion J between the straight portions 20a and 20b in the extending direction of the straight portions 20a and 20b. It suffices that at least one of the joint portions J between the straight line portions 20a, 20b and the curved portion 20c included in the pattern has such a configuration.

  In the first and second embodiments, the length of the straight portions 20a and 20b of any circumference is longer than the length of the straight portions 20a and 20b of the inner circumference. Instead, the length of the straight portions 20a and 20b on the specific circumference may be shorter or the same as the length of the straight portions 20a and 20b on the inner circumference.

  In the first and second embodiments, the curved portion 20c of any circumference is formed as an arc having the same radius of curvature. However, the present invention is not limited to this, and the radius of curvature of the curved portion 20c is on the inner side. The structure may be larger as it goes around, or may be smaller as the inner week, or may be uneven.

  In the first and second embodiments, the main body plate 11 or the resin sheet 60 of the heat sink 10 for laying the optical fiber core wire 20 has a rectangular shape. It may also be other polygons.

  In the said Embodiment 1 and 2, although it was set as the structure by which the curve part 20c was arrange | positioned at the corner | angular part, it is not limited to this in particular, The curve part 20c may be provided in the other part. However, from the viewpoint of effectively utilizing the dead space at the corner, it is preferable that the curved portion 20c is arranged at the corner as in the first and second embodiments.

  In the first and second embodiments described above, the optical fiber core wire 20 is configured to be arranged at intervals between the circumferences. However, the configuration is not particularly limited thereto, and the optical fiber core wire 20 is not between the circumferences. It may be a configuration in which the wires are arranged in close contact with each other.

  In the first embodiment, the configuration is such that the optical fiber core wire 20 is wired on the main body plate 11 of the heat sink 10. However, the present invention is not limited to this, and as shown in FIG. One or a plurality of Peltier elements 13 may be attached on top of each other, and the optical fiber core wire 20 may be wired on the heat sink 14 provided thereon. In such a configuration, not only heat dissipation but also temperature control can be performed.

  In the first and second embodiments, the adhesive layer 30 (or the adhesive layer) is provided on the entire surface of the main body plate 11 or the resin sheet 60 of the heat sink 10. The layer 30 (or the adhesive layer) may be configured to be provided at least in a portion where the optical fiber core wire 20 is wired, and the optical fiber core wire 20 is simply connected via an adhesive (or adhesive). A wired configuration may also be used.

  In the first and second embodiments, the filler 40 is filled between the optical fiber core wires 20. However, the present invention is not limited to this, and the filler 40 is not filled and the optical fiber core wires are not filled. A configuration in which a gap is provided between 20 may be used.

  In the said Embodiment 1 and 2, although it was set as the structure by which the protective film 50 was provided so that the wired optical fiber core wire 20 might be covered, it is not limited to this in particular, The protective film 50 is provided. Alternatively, the configuration may be such that the wired optical fiber 20 is exposed on the surface.

  The present invention is useful for an optical fiber wiring structure and a manufacturing method thereof.

A Optical fiber wiring structure B Base material d Space | interval F Optical fiber core wire J Joint part 10 Heat sink 11 Main body plate 12 Fin 13 Peltier element 14 Heat sink 20 Optical fiber core wire 20a, 20b Straight line part 20c Curved part 21 Optical fiber 21a Core 21b Cladding 22 Covering layer 30 Adhesive layer 40 Filler 50 Protective film 60 Resin sheet 100 Wiring device 110 Base 120 Moving stage 121 First linear moving stage 121a First fixed member 121b First moving base 122 Second linear moving stage 122a Second fixing member 122b Second moving table 123, 125 Guide convex portion 124, 126 Guide concave portion 130 Support member 131 Leg portion 132 Arm portion 140 Wiring portion 141 Wiring head

Claims (6)

A substrate;
On the base material, an optical fiber core wire arranged so as to form a circular pattern in which linear portions and curved portions alternately and continuously extend in parallel,
An optical fiber wiring structure comprising:
The loop pattern is positioned such that the connecting portion between the straight line portion and the curved portion of an arbitrary circumference protrudes in the extending direction of the straight portion from the connecting portion between the straight line portion and the curved portion inside the circumference. Optical fiber wiring structure. In the optical fiber wiring structure according to claim 1,
The loop pattern is an optical fiber wiring structure in which the length of a linear portion of an arbitrary circumference is longer than the length of a linear portion of the inner circumference. In the optical fiber wiring structure according to claim 1 or 2,
The loop pattern is an optical fiber wiring structure in which curved portions of any circumference are formed in an arc having the same radius of curvature. The optical fiber wiring structure according to any one of claims 1 to 3,
An optical fiber wiring structure in which a surface of the base material for laying the optical fiber core wire is formed in a polygon, and a curved portion of the loop pattern is arranged at a corner of the polygon. In the optical fiber wiring structure according to any one of claims 1 to 4,
An optical fiber wiring structure in which the loop pattern is a pattern in which the optical fiber core wires extend in parallel with an interval therebetween. A method of manufacturing an optical fiber wiring structure in which an optical fiber core wire is wired on a substrate so as to form a circular pattern in which straight portions and curved portions are alternately connected and extend in parallel,
The loop pattern is positioned such that the connecting portion between the straight line portion and the curved portion of any circumference protrudes in the extending direction of the straight portion from the connecting portion between the straight line portion and the curved portion inside the circumference. A method for manufacturing an optical fiber wiring structure.

Images