JP6675240B2 - Optical fiber wiring sheet - Google Patents

Description

  The present invention relates to an optical fiber wiring sheet for interconnecting optical elements, components, and devices used in optical communication and optical information processing such as network equipment, optical elements, optical circuit packages, and optical circuit devices in a data center. .

  In the optical connection between network devices in a data center or the like, an optical connector is generally disposed at an end of an optical element, an optical circuit package, an optical circuit device, or the like, and is interconnected by an optical fiber. Since it is necessary to wire such an optical fiber in a complicated shape, an optical fiber wiring sheet for fixing the optical fiber in a predetermined wiring pattern in advance has been proposed (for example, see Patent Document 1).

  The optical fiber wiring sheet described in Patent Literature 1 has an optical fiber disposed on a substrate coated with an adhesive, and a cover layer laminated thereon. Further, the optical fiber has a wiring fixing portion in which the optical fiber is wired in a predetermined wiring pattern, and a plurality of end fixing portions extending from the wiring fixing portion, and the end portion of the wired optical fiber is fixed in the end portion. Protruding from the part. If such an optical fiber wiring sheet is used, complicated wiring work on site can be avoided.

Japanese Patent No. 2574611

  However, in the optical fiber wiring sheet described in Patent Literature 1, the fixed optical fiber is sharply bent immediately after protruding from the end fixing portion, and the optical fiber is damaged or the transmission loss increases. There is a fear.

  The present invention has been made in view of the above circumstances, and has as its object to provide an optical fiber wiring sheet that can suppress sudden bending of an optical fiber and prevent damage to the optical fiber and increase in transmission loss.

The optical fiber wiring sheet of the present invention that solves the above object,
Optical fiber,
A wiring fixing part for fixing the optical fiber with a predetermined wiring pattern,
An end fixing portion for fixing a portion closer to the end than the portion fixed by the wiring fixing portion of the optical fiber,
A portion provided between the wiring fixing portion and the end fixing portion, and a portion of the optical fiber between the portion fixed by the wiring fixing portion and the portion fixed by the end fixing portion is disposed. have a and was bent portion,
The bent portion is formed to be thinner than the wiring fixing portion and the end fixing portion , so that it is more flexible than the wiring fixing portion and the end fixing portion .

  Further, the wiring pattern may have at least one of a straight line portion, a curved portion, an intersection portion, and a fiber pitch conversion portion, and may be wired in a two-dimensional plane.

  Further, the optical fiber may be a strand or a core. Further, the optical fiber wiring sheet may fix one optical fiber or may fix a plurality of optical fibers. Further, one or a plurality of tape cores in which a plurality of optical fiber wires are collectively covered with a resin may be fixed.

  Further, the optical fiber may have a terminal portion for optical connection at both ends.

  Further, the length of the end fixing portion in the direction in which the fixed optical fiber extends may be set to, for example, about 5 mm to 30 mm, and in particular, set to be equal to or less than the allowable bending radius of the optical fiber. Is preferred.

  According to the optical fiber wiring sheet of the present invention, since the wiring fixing portion and the bent portion that is more flexible than the end fixing portion have the bent portion, the optical fiber has a portion immediately after protruding from the end fixing portion. In addition, the bent portion is also easily bent. For this reason, even if the optical fiber is bent, the stress generated in the optical fiber is dispersed, and a sharp bend is suppressed. As a result, damage to the optical fiber and an increase in transmission loss can be prevented.

  In the optical fiber wiring sheet of the present invention, it is preferable that the end fixing portion is a portion that is less likely to bend than the wiring fixing portion.

  By doing so, the bending of the optical fiber at the bent portion is further promoted, whereby the bending at the portion immediately after protruding from the end fixing portion can be further reduced.

Further, in the optical fiber wiring sheet of the present invention, the wiring fixing portion is a portion where the optical fiber is sandwiched between the first sheet and the second sheet in the thickness direction of the optical fiber,
The end fixing portion may be a portion in which the optical fiber is wrapped in the circumferential direction by the first sheet.

  Here, the end fixing portion may be such that the first sheet is doubly arranged at a portion of the optical fiber on the second sheet side.

  By wrapping the optical fiber in the circumferential direction with the first sheet and forming the end fixing portion by this portion, the end fixing portion can be united and compact.

Further, in the optical fiber wiring sheet of the present invention, the wiring fixing portion is a portion where the optical fiber is sandwiched between the first sheet and the second sheet in the thickness direction of the optical fiber,
The end fixing portion sandwiches the optical fiber in the thickness direction of the optical fiber between the first sheet and the second sheet, and further wraps the optical fiber in the circumferential direction with the first sheet or the second sheet. It may be a part.

  By doing so, the end fixing portion is less likely to bend, and the bent portion is relatively easily bent. Thereby, bending at a portion immediately after protruding from the end fixing portion can be reduced, and sharp bending can be further suppressed.

  Further, in the optical fiber wiring sheet of the present invention, a plurality of the end fixing portions are arranged in parallel from the wiring fixing portion to the end of the optical fiber, and the wiring fixing portion is provided between the plurality of end fixing portions. Further, it is preferable that a second bent portion that is more flexible than the end fixing portion is provided.

  By doing so, the stress generated in the optical fiber is further dispersed, and breakage of the optical fiber and increase in transmission loss can be suppressed more reliably.

  Here, two or three or more end fixing portions may be provided, and accordingly, one or two or more second bending portions may be provided. Good.

  ADVANTAGE OF THE INVENTION According to this invention, the optical fiber wiring sheet which can suppress sudden bending of an optical fiber and can prevent damage of an optical fiber and increase of transmission loss can be provided.

(A) is a plan view of the optical fiber wiring sheet of the present invention, (b) is a side view of the optical fiber wiring sheet of the present invention, and (c) is a cross section taken along line AA of (a). FIG. FIG. 2A is a cross-sectional view taken along the line BB of a part of the wiring fixing portion X shown in FIG. FIG. 2B is a cross-sectional view taken along the line CC of the bent portion Z shown in FIG. FIG. 2C is a cross-sectional view taken along line DD of the end fixing portion Y shown in FIG. It is a figure which expands and shows the mode that the part enclosed with the dashed-dotted ellipse in FIG.1 (c) was bent. It is a figure which shows an example of the manufacturing method of the optical fiber wiring sheet of this embodiment step by step. It is a figure for explaining composition of an optical fiber wiring sheet of a modification. (A) is a top view of the optical fiber wiring sheet of 2nd Embodiment, (b) is GG sectional drawing of (a). (A) is a top view of the optical fiber wiring sheet of a 3rd embodiment, (b) is an HH sectional view of (a). (A) is a top view of the optical fiber wiring sheet of a 4th embodiment, and (b) is a II line sectional view of (a). (A) is a top view of the optical fiber wiring sheet of 5th Embodiment, (b) is JJ sectional drawing of (a).

  Hereinafter, an embodiment of an optical fiber wiring sheet of the present invention will be described with reference to the drawings.

  FIG. 1A is a plan view of the optical fiber wiring sheet of the present invention, and FIG. 1B is a side view of the optical fiber wiring sheet of the present invention. FIG. 1B shows a state viewed from below in the drawing of FIG. 1A.

  In the present embodiment, an example is given in which a plurality of (four in the figure) tape cores are arranged and wired in parallel using a plurality of optical fiber strands arranged in parallel and using a tape core coated collectively with an ultraviolet curable resin or the like. A description is given below. This tape core corresponds to an example of an optical fiber, and will be described below as an optical fiber 2. Further, in the following description, the horizontal direction in which the optical fiber 2 extends may be referred to as an extending direction with reference to FIG. The vertical direction in FIG. 1A in which the optical fibers 2 are arranged may be referred to as a width direction, and the direction perpendicular to the plane of FIG. 1A, that is, the vertical direction in FIG. Sometimes called direction. At both ends of the optical fiber 2, connectors 21 are provided as terminal portions for optical connection, and signal light input from one connector 21 is output from the other connector 21. In the drawings showing the thickness direction, such as FIG. 1B, the thickness may be larger than the actual thickness ratio of each component in order to clarify the configuration.

  As shown in FIGS. 1A and 1B, the optical fiber wiring sheet 10 includes a plurality of optical fibers 2, a first sheet 3, and a second sheet 4.

  The first sheet 3 and the second sheet 4 are not particularly limited as long as they have a two-dimensional plane and are flexible. For example, a glass-epoxy resin composite substrate, a polyester film, a polyethylene film, a polyimide film, a gel-like material, a rubber-like material or a foam-like material of an organic material such as silicone or urethane resin, and the like, and ordinary electronic parts and electric parts Any substrate can be used as long as it is used in the above. Further, neither the thickness of the first sheet 3 nor the thickness of the second sheet 4 is particularly limited. In the present embodiment, as the first sheet 3 and the second sheet 4, for example, a 125 μm-thick polyimide film is used.

  The second sheet 4 is formed in a substantially rectangular shape. Further, the first sheet 3 includes a wiring portion 31 having substantially the same shape as the second sheet 4, a plurality of wrapping portions 32 positioned on both sides in the extending direction of the wiring portion 31, and wrapping the plurality of optical fibers 2, respectively. An integrated sheet having a plurality of connecting portions 33 for connecting each of the plurality of wrapping portions 32 and the wiring portion 31. In FIG. 1A, the wiring portion 31 of the first sheet 3 is hidden by the second sheet 4, and the connecting portion 33 is hidden by the optical fiber 2.

  An adhesive (not shown) is applied to the first sheet 3, and the optical fibers 2 are arranged on the first sheet 3 to which the adhesive has been applied. , The second sheet 4 are stacked. Thus, the optical fiber 2 is fixed while being sandwiched between the wiring portion 31 of the first sheet 3 and the second sheet 4. The portion of the first sheet 3 where the optical fiber 2 is sandwiched between the wiring portion 31 and the second sheet 4 corresponds to an example of a wiring fixing portion, and is hereinafter referred to as a wiring fixing portion X. Further, in the wiring fixing portion X, the side of the first sheet 3 where the wiring portion 31 is located in the thickness direction may be referred to as one side in the thickness direction, and the side where the second sheet 4 is located in the thickness direction. , In the thickness direction.

  In the present embodiment, the wiring pattern in the wiring fixing portion X is shown in a simplified manner. However, the wiring pattern may be appropriately selected according to the application purpose, and may be a straight line portion, a curved portion, an intersection portion, and It is formed in a pattern having any of the fiber pitch conversion portions or a combination thereof.

  Each of the plurality of wrapping portions 32 of the first sheet 3 has a length in the width direction set to be about three times the width of the optical fiber 2 (see FIG. 4), and extends around the optical fiber 2 one and a half in the circumferential direction. Wrapping. The portion where the optical fiber 2 is wrapped in the circumferential direction by the wrapping portion 32 corresponds to an example of an end fixing portion, and is hereinafter referred to as an end fixing portion Y.

  Each of the plurality of connecting portions 33 of the first sheet 3 is located between the wiring fixing portion X and the end fixing portion Y and connects the wiring fixing portion X and the end fixing portion Y. The second sheet 4 and the first sheet 3 are not present on the other side of the portion of the optical fiber 2 disposed in the second position. A portion located between the wiring fixing portion X and the end fixing portion Y corresponds to an example of a bent portion, and is hereinafter referred to as a bent portion Z. That is, on the other side of the optical fiber 2, the wrapping portion 32 and the second sheet 4 are separated in the extending direction by the connecting portion 33.

  FIG. 1C is a sectional view taken along line AA of FIG. FIG. 2A is a cross-sectional view taken along a line BB of a part of the wiring fixing portion X shown in FIG. FIG. 2B is a cross-sectional view taken along line CC of the bent portion Z shown in FIG. FIG. 2C is a cross-sectional view of the end fixing portion Y shown in FIG.

  As shown in FIGS. 1C and 2A, the optical fiber 2 is sandwiched between the first sheet 3 and the second sheet 4 in the thickness direction in the wiring fixing portion X. As shown in FIGS. 1C and 2B, in the bent portion Z, the first sheet 3 is located on one side in the thickness direction of the optical fiber 2, and the other side in the thickness direction is released. It is. As shown in FIG. 1C and FIG. 2C, the optical fiber 2 is wrapped in the circumferential direction by a first and a half first sheet 3 in the end fixing portion Y. In other words, in the thickness direction, the optical fiber 2 is supported by two layers in the wiring fixing portion X including the first sheet 3 of one layer and the second sheet 4 of one layer. The optical fiber 2 is supported by the first sheet 3, and the optical fiber 2 is supported by the three layers of the first sheet 3 in the end fixing portion Y. As a result, the bent portion Z becomes the most flexible portion, the next flexible portion becomes the wiring fixing portion X, and the end fixing portion Y becomes the least flexible portion.

  As shown in FIG. 2, the optical fiber 2 of the present embodiment is, for example, a tape in which eight optical fiber wires 22 each having a diameter of about 0.25 mm are arranged in the width direction and collectively covered with an ultraviolet curable resin 23. The two core wires are further arranged in the width direction. The width of the optical fiber 2 is set to, for example, about 4 mm, and the width of the end fixing portion Y is set to about 12 mm, which is three times as large as that of the optical fiber 2. The four optical fibers 2 shown in FIG. 1A are arranged at a pitch of about 8 mm in the width direction.

  In such an optical fiber wiring sheet for fixing the optical fiber 2 in a predetermined wiring pattern, the optical fiber 2 is sharply bent immediately after protruding from the end fixing portion Y, and the optical fiber is damaged or transmitted. There is a possibility that the loss increases.

  FIG. 3 is an enlarged view showing a state in which the portion surrounded by the dashed line ellipse in FIG. 1C is bent. FIG. 3A shows a state of bending to one side in the thickness direction, and FIG. 3B shows a state of bending to the other side in the thickness direction. FIG. 3 shows an extremely bent state of the optical fiber 2 in order to clarify the bent state.

  For example, when an optical connector such as an optical circuit device for connecting the optical fiber 2 is located below, the optical fiber 2 is bent to one side in the thickness direction as shown in FIG. The portion immediately after protruding from the end fixing portion Y surrounded by the ellipse is particularly easy to bend. Hereinafter, a portion immediately after protruding from the end fixing portion Y may be referred to as a portion W immediately after protruding.

  The present invention has a bent portion that is more flexible than the wire fixing portion and the end fixing portion. In the present embodiment, the bent portion is located between the wiring fixing portion X and the end fixing portion Y. The provided bent portion Z corresponds to the bent portion Z. In the bent portion Z, only the connecting portion 33 of the first sheet 3 is located on one side in the thickness direction of the optical fiber 2 (see also FIG. 2B). For this reason, the optical fiber 2 is also bent at the bent portion Z, and the stress applied to the portion W immediately after the projection of the optical fiber 2 is also distributed to the bent portion Z of the optical fiber 2. As a result, a sharp bend in the portion W immediately after the protrusion of the optical fiber 2 can be suppressed, and breakage of the optical fiber 2 and an increase in transmission loss can be prevented.

  Further, for example, even when an optical connector such as an optical circuit device to be connected by the optical fiber 2 is located on the other side, and the optical fiber 2 is bent to the other side in the thickness direction as shown in FIG. The optical fiber 2 is also bent at the bent portion Z, and the stress applied to the portion W immediately after the projection of the optical fiber 2 is also distributed to the bent portion Z of the optical fiber 2.

  In particular, in the present embodiment, an interval is generated between the wrapping portion 32 of the first sheet 3 and the second sheet 4 by the length of the connecting portion 33 of the first sheet 3 in the extending direction. For this reason, as shown in FIG. 3B, even when the optical fiber 2 is bent to the other side in the thickness direction, the wrapping portion 32 of the first sheet 3 and the second sheet 4 on the other side of the optical fiber 2 are formed. Interference is suppressed, and the problem that the wrapping portion 32 of the first sheet 3 and the second sheet 4 interfere with each other to make it difficult to bend at the bent portion Z can be avoided.

  Furthermore, in the present embodiment, since the wiring fixing portion X is more easily bent than the end fixing portion Y, the bending of the bent portion Z is promoted while the wiring fixing portion X is curved, Accordingly, the stress applied to the portion W immediately after the projection of the optical fiber 2 can be efficiently dispersed. Even when the optical fiber 2 is bent in the width direction, the optical fiber 2 is also bent at the bent portion Z, and the stress applied to the portion W immediately after the projection of the optical fiber 2 is applied to the bent portion Z of the optical fiber 2. Can also be dispersed.

  Next, an example of a method for manufacturing the optical fiber wiring sheet 10 of the present embodiment will be described.

  FIG. 4 is a diagram illustrating an example of a method of manufacturing the optical fiber wiring sheet 10 according to the present embodiment in a stepwise manner.

  In order to manufacture the optical fiber wiring sheet 10, first, the first sheet 3 is prepared. As described above, the first sheet 3 is made of a polyimide film having a thickness of 125 μm, and a plurality of (three in this embodiment) cuts c are made along the extending direction. A plurality of (four in the present embodiment) wrapping portions 32 and a connecting portion 33 that connects each of the plurality of wrapping portions 32 to the wiring portion 31 are formed by partially removing the outer portion in the existing direction.

  Next, an adhesive (not shown) is applied to the entire surface of the first sheet 3. Here, the adhesive is directly applied to the first sheet 3 or in a state of being dissolved in a solvent to form a coating solution, and is subjected to a method such as roll coating, bar coating, blade coating, casting, dispenser coating, spray coating, screen printing, or the like. What is necessary is just to apply. Note that a method may be adopted in which an adhesive sheet having an adhesive layer formed on a peelable film in advance is attached to the first sheet 3 and then the peelable film is removed.

  Next, as shown in FIG. 4B, the optical fibers 2 are wired on the first sheet 3 to which the adhesive has been applied. In the present embodiment, a state is shown in which a plurality of optical fibers 2 linearly extending in the extending direction are arranged in parallel in the width direction in the wiring section 31. Wired to form a wiring pattern. The ends of the optical fibers 2 wired in a predetermined wiring pattern in the wiring part 31 are pulled out from the respective wrapping parts 32 so as to be terminal ends for optical connection with an optical connector or the like. To

  Next, as shown in FIG. 4C, the second sheet 4 is laminated on the wiring portion 31 of the first sheet 3 (see FIG. 4B), and is bonded to the first sheet 3 with the applied adhesive. Let it. Thus, the central portion in the width direction of the optical fiber 2 is sandwiched between the first sheet 3 and the second sheet 4 (see FIG. 2A), and the wiring fixing portion X is formed. The adhesive may be applied to the second sheet 4 and then laminated on the first sheet 3.

  Finally, as shown in FIG. 4D, the portion of the optical fiber 2 placed on the wrapping portion 32 is wrapped in the circumferential direction by the wrapping portion 32. Thereby, the periphery of the optical fiber 2 is wrapped by the wrapping part 32 (see FIG. 2C), and the end fixing part Y is formed. Further, a portion between the wiring fixing portion X and the end fixing portion Y becomes a bent portion Z. FIG. 4C shows the optical fiber 2 being wrapped by the wrapping portion 32 in a stepwise manner.

  Next, a modified example of the optical fiber wiring sheet 10 shown in FIG. 1 will be described. In the modified example described below, differences from the embodiment shown in FIG. 1 will be mainly described, and components having the same names as the components in the embodiment shown in FIG. And a duplicate description may be omitted.

  FIG. 5 is a diagram illustrating the configuration of an optical fiber wiring sheet 10 ′ according to a modification.

  FIG. 5A shows a first sheet 3 and a second sheet 4 used for a modified optical fiber wiring sheet 10 ′ (see FIG. 5B). In the present modification, the length of the first sheet 3 in the extending direction in the wiring portion 31 is shorter than the first sheet 3 by the length t at each of both ends in the extending direction. The second cuts c2 are provided at intervals. Thus, the uncut portion becomes the connecting portion 33.

  FIG. 5B is a plan view of an optical fiber wiring sheet 10 ′ of a modified example manufactured using the first sheet 3 and the second sheet 4 shown in FIG. FIG. 3 is a sectional view taken along line FF of FIG.

  As shown in FIGS. 5B and 5C, in the optical fiber wiring sheet 10 ′ of the modified example, both ends of the wiring portion 31 in the extending direction are formed longer than the first sheet 3. The optical fiber 2 arranged at the position where the first sheet 3 is located only on one side in the thickness direction. Thereby, at each of both ends in the extending direction of the wiring portion 31, a portion formed longer than the second sheet 4 becomes the bent portion Z, and the stress applied to the portion W immediately after the protrusion can be dispersed.

  According to the optical fiber wiring sheet 10 ′ of the present modification, when forming the first sheet 3, it is only necessary to make a cut c and a second cut c2 in a rectangular film. For this reason, the work of creating the first sheet 3 is easier than in the above embodiment in which the first sheet 3 is created by performing processing such as cutting off a part.

  Next, another embodiment of the optical fiber wiring sheet of the present invention will be described. In the following description, components having the same names as those of the components described so far will be denoted by the same reference numerals as in the description of the above-described modification, and redundant description will be omitted. May be.

  FIG. 6A is a plan view of the optical fiber wiring sheet 11 according to the second embodiment, and FIG. 6B is a cross-sectional view taken along the line GG of FIG.

  As shown in FIGS. 6A and 6B, in the optical fiber wiring sheet 11 of the second embodiment, two end fixing portions Y extend from the wiring fixing portion X to the tip of each optical fiber 2. It is juxtaposed. Thus, a second bent portion Z2 that is more flexible than the wire fixing portion X and the end fixing portion Y is provided between the end fixing portions Y. Therefore, the stress applied to the portion W immediately after the protrusion can be dispersed to the bent portion Z and the second bent portion Z2, and the sharp bend at the portion W immediately after the protrusion can be further suppressed. Note that three or more end fixing portions Y may be arranged in parallel from the wiring fixing portion X to the tip of each optical fiber 2, and a plurality of second bent portions Z2 may be provided.

  FIG. 7A is a plan view of the optical fiber wiring sheet 12 of the third embodiment, and FIG. 7B is a cross-sectional view taken along line HH of FIG. 7A.

  As shown in FIGS. 7A and 7B, in the optical fiber wiring sheet 12 of the third embodiment, two end fixing portions Y extend from the wiring fixing portion X to the tip of each optical fiber 2. It is juxtaposed. Thereby, a bent portion Z is provided between the wiring fixing portion X and the end fixing portion Y, and a second bent portion Z2 is provided between the end fixing portions Y.

  The end fixing portion Y on the wiring fixing portion X side sandwiches the optical fiber 2 in the thickness direction between the first sheet 3 and the second sheet 4, and furthermore, wraps the optical fiber 2 in the circumferential direction by the wrapping portion 32 of the first sheet 3. It consists of wrapping. Thereby, as shown in FIG. 7B, in the end fixing portion Y on the wiring fixing portion X side, the optical fiber 2 is composed of three layers (two first sheets 3 and one second sheet 4). Supported by.

  The end fixing portion Y on the end side of the optical fiber 2 sandwiches the optical fiber 2 in the thickness direction between the first sheet 3 and the second sheet 4, and furthermore, the optical fiber 2 is wrapped by the wrapping portion 42 of the second sheet 4. Is wrapped in the circumferential direction. Thus, as shown in FIG. 7B, in the end fixing portion Y on the end side of the optical fiber 2, the optical fiber 2 is composed of three layers (two layers of the second sheet 4 and one layer of the first sheet 4). Supported in 3).

  In the optical fiber wiring sheet 12 of the third embodiment, both the bent portion Z and the second bent portion Z2 have the optical fiber 2 in the thickness direction by the first sheet 3 and the second sheet 4 like the wiring fixing portion X. It is sandwiched. However, as shown in FIG. 7A, the length in the width direction of both the bent portion Z and the second bent portion Z2 is significantly shorter than that of the wiring fixing portion X. Therefore, both the bent portion Z and the second bent portion Z2 are more easily bent than the wiring fixing portion X. Thereby, the stress applied to the portion W immediately after the protrusion can be dispersed to the bent portion Z and the second bent portion Z2. Note that the optical fiber wiring sheet 12 of the third embodiment may have a mode in which a plurality of second bent portions Z2 are provided.

  FIG. 8A is a plan view of the optical fiber wiring sheet 13 of the fourth embodiment, and FIG. 8B is a cross-sectional view taken along line II of FIG.

  In the optical fiber wiring sheet 13 of the fourth embodiment, the first sheet 3 is subjected to a very simple processing such as making a second cut c2 along the width direction. Also in this mode, the bent portion Z can be provided in the portion W immediately after the protrusion, and the sharp bend in the portion W immediately after the protrusion can be suppressed. In the optical fiber wiring sheet 13 of the fourth embodiment, the bent portion Z may be provided by partially removing the first sheet 3 instead of the second cut c2. The bent portion Z may be provided by pressing a part of the thin part in a thin manner.

  In the optical fiber wiring sheet 13 of the fourth embodiment, a mode in which the optical fiber 2 in the end fixing portion Y is protected by a resin material can be adopted as a preferable mode. Here, the method of protecting with a resin material may be appropriately selected according to the purpose of application, and for example, a coating solution is prepared by dissolving a resin material in an appropriate solvent, and the solution is coated on the optical fiber 2. May be dried, or a liquid thermosetting resin may be dropped on the optical fiber 2 and cured by heating. Furthermore, a thermosetting resin melted by heating may be dropped on the optical fiber 2 and cooled and solidified, or an anaerobic or moisture-curable resin may be dropped on the optical fiber 2, It may be solidified under anaerobic conditions or by providing moisture. In this case, the coating with the resin material may be performed only on the portion where the optical fiber 2 exists, or on the entire surface of the end fixing portion Y of the first sheet 3.

  FIG. 9A is a plan view of the optical fiber wiring sheet 14 according to the fifth embodiment, and FIG. 9B is a sectional view taken along line JJ of FIG. 9A.

  In the optical fiber wiring sheet 14 of the fifth embodiment, the third sheet 5 is laminated on the other side of the optical fiber 2 without processing the first sheet 3, thereby forming the end fixing portion Y. It is. In the fifth embodiment, an aspect is adopted in which the third sheet 5 is laminated in two layers so that the end fixing portion Y is less likely to bend than the wiring fixing portion X. Also in this mode, the bent portion Z can be provided in the portion W immediately after the protrusion, and the sharp bend in the portion W immediately after the protrusion can be suppressed.

  The present invention is not limited to the embodiments described above, and various changes can be made within the scope described in the claims. For example, in the above-described embodiment, an example in which the input-side end fixing portion Y and the output-side end fixing portion Y face each other has been described. However, as described above, the wiring pattern is Depending on the wiring pattern, the input side end fixing portion Y and the output side end fixing portion Y may be provided in a direction orthogonal to each other. Further, the first sheet 3 and the second sheet 4 are made of the same material and the same thickness, but, for example, the first sheet 3 may be made of a material that is less flexible than the second sheet 4, Even with the same material, the first sheet 3 may be configured to be thicker than the second sheet 4. By doing so, the end fixing portion Y can be made more difficult to bend than the wiring fixing portion X.

In addition, even if it is a component contained only in each description of each embodiment and modification described above, the component may be applied to other embodiments and modifications.
Finally, what has been described so far is described below.
The optical fiber wiring sheet described so far is
Optical fiber,
A wiring fixing part for fixing the optical fiber with a predetermined wiring pattern,
An end fixing portion for fixing a portion closer to the end than the portion fixed by the wiring fixing portion of the optical fiber,
It is provided between the wiring fixing part and the end fixing part, and has a bent part which is more flexible than the wiring fixing part and the end fixing part.
Here, the bent portion may be a portion provided by forming a cut or a hole, or may be a portion provided by thinning or narrowing the width.

10, 11, 12, 13, 14 Optical fiber wiring sheet 2 Optical fiber 21 Connector 3 First sheet 31 Wiring part 32 Envelope part 33 Connecting part 4 Second sheet 42 Envelope part 5 Third sheet W Immediately after protrusion X Wiring fixing part Y end fixed part Z bent part

Claims (5)

Optical fiber,
A wiring fixing part for fixing the optical fiber with a predetermined wiring pattern,
An end fixing portion for fixing a portion closer to the end than the portion fixed by the wiring fixing portion of the optical fiber,
A portion provided between the wiring fixing portion and the end fixing portion, and a portion of the optical fiber between the portion fixed by the wiring fixing portion and the portion fixed by the end fixing portion is disposed. have a and was bent portion,
The bent portion is configured to be thinner than the wiring fixing portion and the end fixing portion, so that the bent portion is more flexible than the wiring fixing portion and the end fixing portion. Sheet. The wiring fixing portion is a portion where the optical fiber is sandwiched between the first sheet and the second sheet in the thickness direction of the optical fiber,
2. The optical fiber wiring sheet according to claim 1, wherein the end fixing portion is a portion in which the optical fiber is circumferentially wrapped by the first sheet. 3. The wiring fixing portion is a portion where the optical fiber is sandwiched between the first sheet and the second sheet in the thickness direction of the optical fiber,
The end fixing portion sandwiches the optical fiber in the thickness direction of the optical fiber between the first sheet and the second sheet, and further wraps the optical fiber in the circumferential direction with the first sheet or the second sheet. The optical fiber wiring sheet according to claim 1, wherein the optical fiber wiring sheet is a portion.   4. The optical fiber wiring sheet according to claim 1, wherein the end fixing portion is a portion that is harder to bend than the wiring fixing portion. 5.   A plurality of the end fixing portions are juxtaposed from the wiring fixing portion to the end of the optical fiber. Between the plurality of end fixing portions, the end fixing portion is more flexible than the wiring fixing portion and the end fixing portion. The optical fiber wiring sheet according to any one of claims 1 to 4, wherein the optical fiber wiring sheet is provided with two bent portions.