JP2017167467A - Optical fiber interconnection sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical fiber interconnection sheet in which an optical fiber is restrained from being sharply bent, thus enabling prevention of damage and an increase in transmission loss of the optical fiber.SOLUTION: An optical fiber interconnection sheet includes: optical fibers 2; an interconnection fixing part X for fixing the optical fibers 2 in a predetermined interconnection pattern; end fixing parts Y for fixing portions of the optical fibers 2 which are closer to end sides thereof than the portions fixed by the interconnection fixing part X; and bending parts Z which are provided between the interconnection fixing part X and the end fixing parts Y, and more easily deflected than the interconnection fixing part X and the end fixing parts Y.SELECTED DRAWING: Figure 1

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 of data center network equipment, optical elements, optical circuit packages, and optical circuit devices. .

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

  The optical fiber wiring sheet described in Patent Document 1 is obtained by placing an optical fiber on a base material coated with an adhesive and laminating a cover layer thereon. In addition, the optical fiber has a wiring fixing portion wired with 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 to the end portion. It protrudes from the part. If such an optical fiber wiring sheet is used, complicated wiring work in the field can be avoided.

Japanese Patent No. 2574611

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

  In view of the above circumstances, an object of the present invention is to provide an optical fiber wiring sheet that can suppress rapid 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-mentioned object is an optical fiber,
A wiring fixing portion for fixing the optical fiber with a predetermined wiring pattern;
An end fixing portion for fixing a portion of the optical fiber on the end side with respect to a portion fixed by the wiring fixing portion;
It is provided between the said wiring fixing | fixed part and the said edge part fixing | fixed part, It has a bending part which is easier to bend than this wiring fixing | fixed part and this edge fixing | fixed part, It is characterized by the above-mentioned.

  Here, the bent portion may be a portion provided by forming a cut or a hole, or may be a portion provided by making it thin or narrow.

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

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

  The optical fiber may have a terminal portion for optical connection at both ends.

  Furthermore, 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 particularly 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 bent portion is more easily bent than the wiring fixing portion and the end fixing portion, the optical fiber is a portion immediately after protruding from the end fixing portion. In addition, it is easy to bend at the bent portion. For this reason, even if the optical fiber is bent, the stress generated in the optical fiber is dispersed, and rapid bending is suppressed. As a result, damage to the optical fiber and increase in transmission loss can be prevented.

  The optical fiber wiring sheet of this invention WHEREIN: It is preferable that the said edge part fixing | fixed part is a part which is harder to bend than the said wiring fixing | fixed part.

  By doing so, the optical fiber is further facilitated to bend at the bent portion, whereby the bending at the portion immediately after protruding from the end fixing portion can be further eased.

Furthermore, in the optical fiber wiring sheet of the present invention, the wiring fixing portion is a portion in which the optical fiber is sandwiched in the thickness direction of the optical fiber by the first sheet and the second sheet,
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 part may be one in which the first sheet is double arranged in 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 made compact and compact.

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

  By carrying out like this, the said edge part fixing | fixed part becomes difficult to bend, and the said bending part becomes easy to bend more relatively. Thereby, the bending in the part immediately after protruding from the said edge part fixing | fixed part can be relieve | moderated, and a rapid bending can be suppressed more.

  Furthermore, 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 portions are provided between the plurality of end fixing portions. And it is preferable that the 2nd bending part which is easier to bend than this edge part fixing | fixed part is provided.

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

  Here, two end fixing portions may be provided, or three or more end fixing portions may be provided. Accordingly, one second bending portion may be provided, 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 suppresses the rapid bending of an optical fiber and can prevent the failure | damage of an optical fiber and the increase in transmission loss can be provided.

(A) is a top view of the optical fiber wiring sheet of this invention, (b) is a side view of the optical fiber wiring sheet of this invention, (c) is the AA line cross section of (a). FIG. (A) is the BB sectional drawing which cut | disconnected some wiring fixing | fixed part X shown to Fig.1 (a). (B) is CC line sectional drawing which cut | disconnected the bending part Z shown to Fig.1 (a). (C) is the DD sectional view taken on the line which cut | disconnected the edge part fixing | fixed part Y shown to Fig.1 (a). It is a figure which expands and shows a mode that the part enclosed by the ellipse of the dashed-dotted line in FIG.1 (c) bent. It is a figure which shows an example of the manufacturing method of the optical fiber wiring sheet of this embodiment in steps. It is a figure for demonstrating the structure of the optical fiber wiring sheet of a modification. (A) is a top view of the optical fiber wiring sheet of 2nd Embodiment, (b) is the GG sectional view taken on the line of (a). (A) is a top view of the optical fiber wiring sheet of 3rd Embodiment, (b) is the HH sectional view taken on the line of (a). (A) is a top view of the optical fiber wiring sheet of 4th Embodiment, (b) is the II sectional view taken on the line of (a). (A) is a top view of the optical fiber wiring sheet of 5th Embodiment, (b) is the JJ sectional view taken on the line of (a).

  Hereinafter, an embodiment of the 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. 1 (b) shows a state viewed from below in the paper surface of FIG. 1 (a).

  In this embodiment, a plurality of optical fiber strands are arranged in parallel and a tape core wire that is collectively covered with an ultraviolet curable resin or the like is used, and a plurality of tape core wires (four in the figure) are arranged in parallel and wired. I will give you a description. This tape core wire corresponds to an example of an optical fiber, and will be described as an optical fiber 2 below. Furthermore, in the following description, the horizontal direction in which the optical fiber 2 extends may be referred to as the extending direction with reference to FIG. Further, the vertical direction of FIG. 1A where the optical fibers 2 are arranged may be referred to as the width direction, and the direction perpendicular to the paper surface of FIG. 1A, that is, the vertical direction of FIG. Sometimes called direction. At both ends of the optical fiber 2, connectors 21 are provided as end portions for optical connection, and signal light input from one connector 21 is output from the other connector 21. In addition, in the figure which shows thickness directions, such as FIG.1 (b), in order to clarify a structure, it may show thicker than the ratio of the actual thickness in each structural member.

  As shown in FIG. 1A and FIG. 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. Examples include glass-epoxy resin composite substrates, polyester films, polyethylene films, polyimide films, gel materials of organic materials such as silicone or urethane resin, rubber materials, foam materials, etc. Any substrate can be used as long as it is used in the above. Moreover, neither the thickness of the 1st sheet | seat 3 nor the thickness of the 2nd sheet | seat 4 is specifically limited. In the present embodiment, for example, a polyimide film having a thickness of 125 μm is used as the first sheet 3 and the second sheet 4.

  The second sheet 4 is formed in a substantially rectangular shape. The first sheet 3 has a wiring portion 31 that is substantially the same shape as the second sheet 4, a plurality of wrapping portions 32 that are positioned on both sides in the extending direction of the wiring portion 31, and respectively wrap the plurality of optical fibers 2, It is a sheet of an integral structure having a plurality of connecting portions 33 that connect each of the plurality of wrapped portions 32 and the wiring portion 31. In FIG. 1A, the wiring portion 31 of the first sheet 3 is hidden behind the second sheet 4, and the connecting portion 33 is hidden behind the optical fiber 2.

  An adhesive (not shown) is applied to the first sheet 3, the optical fiber 2 is disposed on the first sheet 3 to which the adhesive is applied, and the wiring portion 31 of the first sheet 3 is further disposed on the first sheet 3. The second sheet 4 is laminated. Thereby, the optical fiber 2 is fixed in a state of being sandwiched between the wiring portion 31 of the first sheet 3 and the second sheet 4. A portion where the optical fiber 2 is sandwiched between the wiring portion 31 and the second sheet 4 of the first sheet 3 corresponds to an example of a wiring fixing portion, and is hereinafter referred to as a wiring fixing portion X. In the wiring fixing portion X, the side where the wiring portion 31 of the first sheet 3 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. , Sometimes referred to as the other side in the thickness direction.

  In the present embodiment, the wiring pattern in the wiring fixing portion X is shown in a simplified manner, but the wiring pattern may be appropriately selected according to the application purpose, and a straight line portion, a curved portion, an intersecting portion, and It is formed with 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 is set to have a length in the width direction of about three times the width dimension of the optical fiber 2 (see FIG. 4), and the circumference of the optical fiber 2 is set to one and a half in the circumferential direction. Wrapping. A 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 a portion between the wiring fixing portion X and the end fixing portion Y and connecting the wiring fixing portion X and the end fixing portion Y. The connecting portion 33 The second sheet 4 and the first sheet 3 do not exist on the other side of the portion of the optical fiber 2 arranged in the 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 wrapped portion 32 and the second sheet 4 are separated in the extending direction by the amount of the connecting portion 33.

  FIG.1 (c) is the sectional view on the AA line of the same figure (a). FIG. 2A is a cross-sectional view taken along line BB in which a part of the wiring fixing portion X shown in FIG. FIG.2 (b) is CC sectional view taken on the line which cut | disconnected the bending part Z shown to Fig.1 (a). FIG.2 (c) is the DD sectional view taken on the line which cut | disconnected the edge part fixing | fixed part Y shown to Fig.1 (a).

  As shown in FIG. 1C and FIG. 2A, in the wiring fixing portion X, the optical fiber 2 is sandwiched between the first sheet 3 and the second sheet 4 in the thickness direction. 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 FIGS. 1C and 2C, in the end fixing portion Y, the optical fiber 2 is in a state of being wrapped by the first sheet 3 one and a half times in the circumferential direction. That is, in the thickness direction, in the wiring fixing portion X, the optical fiber 2 is supported by two layers including the first sheet 3 of one layer and the second sheet 4 of one layer, and one layer is formed in the bent portion Z. The optical fiber 2 is supported by the first sheet 3, and the optical fiber 2 is supported by the three-layer 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 most difficult portion.

  As shown in FIG. 2, the optical fiber 2 of the present embodiment is a tape in which, for example, eight optical fiber strands 22 having a diameter of about 0.25 mm are arranged in the width direction and are collectively covered with an ultraviolet curable resin 23. Two core wires are arranged in the width direction. For example, the width of the optical fiber 2 is set to about 4 mm, and the width of the end fixing portion Y is set to about 12 mm, which is three times that of the optical fiber 2. Further, 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 with a predetermined wiring pattern, the optical fiber 2 is bent sharply immediately after protruding from the end fixing portion Y, and the optical fiber is damaged or transmitted. Loss may increase.

  FIG. 3 is an enlarged view showing a state where a portion surrounded by an alternate long and short dash line in FIG. 1C is bent. FIG. 3 (a) shows a state bent to one side in the thickness direction, and FIG. 3 (b) shows a state bent to the other side in the thickness direction. In addition, in FIG. 3, in order to clarify the state which the optical fiber 2 bent, the mode that it bent extremely is shown.

  For example, when an optical connector such as an optical circuit device for connecting the optical fiber 2 is positioned 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 an ellipse is particularly easily bent. Hereinafter, the portion immediately after protruding from the end fixing portion Y may be referred to as a portion W immediately after protruding.

  In this invention, it has a bending part which is easier to bend than a wiring fixing part and an end part fixing part, and this bending part is between the wiring fixing part X and the end fixing part Y in this embodiment. The bent portion Z provided corresponds to this. 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 optical fiber 2 is projected is also distributed to the bent portion Z of the optical fiber 2. As a result, rapid bending of the optical fiber 2 at the portion W immediately after the protrusion can be suppressed, and damage to the optical fiber 2 and increase in transmission loss can be prevented.

  Further, for example, even when the 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 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. Therefore, 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 and the second sheet 4 of the first sheet 3 on the other side of the optical fiber 2 are Interference is suppressed, and the problem that the wrapping portion 32 of the first sheet 3 interferes with the second sheet 4 and the bending portion Z is less likely to be bent can be avoided.

  Furthermore, in this embodiment, since the wiring fixing part X is more flexible than the end fixing part Y, the bending of the bent part Z is promoted while the wiring fixing part X is curved. As a result, 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.

  Then, an example of the manufacturing method of the optical fiber wiring sheet 10 of this embodiment is demonstrated.

  Drawing 4 is a figure showing an example of a manufacturing method of optical fiber wiring sheet 10 of this embodiment in steps.

  In order to manufacture the optical fiber wiring sheet 10, first, the first sheet 3 is prepared. As described above, a polyimide film having a thickness of 125 μm is used for the first sheet 3 and a plurality of (three in the present embodiment) cuts c are made along the extending direction, and then the wiring portion 31 is extended. By partially excising the outer portion in the present direction, a plurality (four in the present embodiment) of 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.

  Next, an adhesive (not shown) is applied to the entire surface of the first sheet 3. Here, the adhesive agent is directly applied to the first sheet 3 or dissolved in a solvent to form a coating solution, and a method such as roll coating, bar coating, blade coating, casting, dispenser coating, spray coating, or screen printing is used. What is necessary is just to apply. In addition, the method of sticking the adhesive sheet by which the adhesive bond layer was previously formed on the peelable film to the 1st sheet | seat 3, and removing a peelable film after that may be employ | adopted.

  Next, as shown in FIG. 4B, the optical fiber 2 is wired on the first sheet 3 coated with the adhesive. In the present embodiment, the wiring portion 31 shows a state in which a plurality of optical fibers 2 that extend linearly in the extending direction are arranged in parallel in the width direction. Wiring is performed so as to form a wiring pattern. In addition, the end portions of the optical fibers 2 wired in a predetermined wiring pattern in the wiring portion 31 are drawn from the respective wrapping portions 32 so as to be terminal portions for optical connection with optical connectors or the like. To.

  Next, as shown in FIG.4 (c), the 2nd sheet | seat 4 is laminated | stacked on the wiring part 31 (refer FIG.4 (b)) of the 1st sheet | seat 3, and it adheres with the 1st sheet | seat 3 with the apply | coated adhesive agent. Let Thereby, the center part 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 second sheet 4 may be laminated on the first sheet 3 after applying an adhesive.

  Finally, as shown in FIG. 4 (d), the portion of the optical fiber 2 placed on the wrap portion 32 is wrapped by the wrap portion 32 in the circumferential direction. Thereby, the periphery of the optical fiber 2 is wrapped by the wrapped portion 32 (see FIG. 2C), and the end fixing portion Y is formed. Further, a portion between the wiring fixing portion X and the end fixing portion Y becomes a bent portion Z. In FIG. 4C, the state in which the optical fiber 2 is wrapped by the wrapped portion 32 is shown stepwise.

  Next, a modification of the optical fiber wiring sheet 10 shown in FIG. 1 will be described. In the modification described below, the difference from the embodiment shown in FIG. 1 will be mainly described, and the constituent elements having the same names as the constituent elements in the embodiment shown in FIG. The description will be omitted, and repeated description may be omitted.

  FIG. 5 is a diagram for explaining the configuration of a modified example of the optical fiber wiring sheet 10 ′.

  FIG. 5A shows the first sheet 3 and the second sheet 4 used for the optical fiber wiring sheet 10 ′ (see FIG. 5B) of the modified example. In the present modification, the length in the extending direction of the wiring portion 31 of the first sheet 3 is along the width direction so as to be shorter than the first sheet 3 by the length t at each end portion in the extending direction. The second notches c2 are spaced apart. Thereby, the uncut portion becomes the connecting portion 33.

  FIG. 5B is a plan view of a modified optical fiber wiring sheet 10 ′ manufactured using the first sheet 3 and the second sheet 4 shown in FIG. 5A, and FIG. These are the FF sectional view taken on the line of the same figure (b).

  As shown in FIG. 5B and FIG. 5C, the modified optical fiber wiring sheet 10 ′ is formed longer than the first sheet 3 at both ends of the wiring part 31 in the extending direction. In the optical fiber 2 arranged in the part, the first sheet 3 is located only on one side in the thickness direction. Thereby, the part formed longer than the 2nd sheet | seat 4 in each of the both ends of the extending direction of the wiring part 31 turns into the bending part Z, and the stress concerning the part W immediately after protrusion can be disperse | distributed.

  According to the optical fiber wiring sheet 10 ′ of the present modified example, when the first sheet 3 is formed, it is only necessary to make the cut c and the second cut c 2 with respect to the rectangular film. For this reason, compared with the said embodiment which performs the process of excising a part etc. and producing the 1st sheet | seat 3, the preparation operation | work of the 1st sheet | seat 3 becomes easy.

  Next, another embodiment of the optical fiber wiring sheet of the present invention will be described. In the explanation after this, like the explanation of the above-described modification, the constituent elements having the same names as those of the constituent elements explained so far are given the same reference numerals and explanations are omitted. There are things to do.

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

  As shown in FIG. 6A and FIG. 6B, in the optical fiber wiring sheet 11 of the second embodiment, two end fixing portions Y are provided from the wiring fixing portion X to the tip of each optical fiber 2. It is installed side by side. Thereby, between the end fixing portions Y, the second bending portion Z2 that is more flexible than the wiring fixing portion X and the end fixing portion Y is provided. For this reason, the stress concerning the part W immediately after a protrusion can be disperse | distributed to the bending part Z and the 2nd bending part Z2, and the rapid bending in the part W immediately after a protrusion can be suppressed further. Note that three or more end fixing portions Y may be provided 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.7 (a) is a top view of the optical fiber wiring sheet 12 of 3rd Embodiment, The same figure (b) is the HH sectional view taken on the line of the same figure (a).

  As shown in FIGS. 7A and 7B, in the optical fiber wiring sheet 12 of the third embodiment, two end fixing portions Y are provided from the wiring fixing portion X to the tip of each optical fiber 2. It is installed side by side. 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 by the first sheet 3 and the second sheet 4, and further, the optical fiber 2 in the circumferential direction by the wrapping portion 32 of the first sheet 3. Consists of wrapping. Thereby, as shown in FIG.7 (b), in the edge part fixing | fixed part Y by the side of the wiring fixing | fixed part X, the optical fiber 2 is 3 layers (2 layers 1st sheet | seat 3 and 1 layer 2nd sheet | seat 4). It is supported by.

  Further, the end fixing portion Y on the end side of the optical fiber 2 sandwiches the optical fiber 2 in the thickness direction by the first sheet 3 and the second sheet 4, and further, the optical fiber 2 by the wrapping portion 42 of the second sheet 4. Is wrapped in the circumferential direction. Thereby, as shown in FIG.7 (b), in the edge part fixing | fixed part Y at the edge part side of the optical fiber 2, the optical fiber 2 is 3 layers (2 layers 2nd sheet | seat 4 and 1 layer 1st sheet | seat). Supported by 3).

  In the optical fiber wiring sheet 12 of the third embodiment, both the bent portion Z and the second bent portion Z2 are connected to the optical fiber 2 in the thickness direction by the first sheet 3 and the second sheet 4 in the same manner as 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. For this reason, both the bent portion Z and the second bent portion Z2 are more easily bent than the wiring fixing portion X. Thereby, the stress concerning the part W immediately after protrusion can be disperse | distributed to the bending part Z and the 2nd bending part Z2. In addition, also in the optical fiber wiring sheet 12 of 3rd Embodiment, it is good also as an aspect which provides two or more 2nd bending parts Z2.

  Fig.8 (a) is a top view of the optical fiber wiring sheet 13 of 4th Embodiment, The same figure (b) is the II sectional view taken on the line of the same figure (a).

  In the optical fiber wiring sheet 13 according to the fourth embodiment, the first sheet 3 is subjected to extremely simple processing such as making a second cut c2 along the width direction. Also according to this aspect, the bent portion Z can be provided in the portion W immediately after the protrusion, and the rapid bending in the portion W immediately after the protrusion can be suppressed. Further, in the optical fiber wiring sheet 13 of the fourth embodiment, the bent portion Z may be provided by partially cutting the first sheet 3 instead of the second cut c2, or the first sheet 3 You may provide the bending part Z by pressing a part of to thin.

  In addition, in the optical fiber wiring sheet 13 of 4th Embodiment, the aspect which protects the optical fiber 2 in the edge part fixing | fixed part Y with a resin material can also be employ | adopted as a preferable aspect. Here, the method of protecting with a resin material may be appropriately selected according to the purpose of application. For example, the resin material is dissolved in an appropriate solvent to prepare a coating solution, which is applied to the optical fiber 2. The liquid thermosetting resin may be dropped onto the optical fiber 2 and cured by heating. Further, a thermosetting resin heated and melted 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 applying moisture. In this case, the coating with the resin material may be only on the portion where the optical fiber 2 exists or on the entire surface of the end fixing portion Y in the first sheet 3.

  Fig.9 (a) is a top view of the optical fiber wiring sheet 14 of 5th Embodiment, The same figure (b) is the JJ sectional view taken on the line of the same figure (a).

  In the optical fiber wiring sheet 14 of the fifth embodiment, the first sheet 3 is not processed and the third sheet 5 is laminated on the other side of the optical fiber 2 to thereby form the end fixing portion Y. It is. In addition, in 5th Embodiment, the aspect which makes it difficult to bend the edge part fixing | fixed part Y compared with the wiring fixing | fixed part X is employ | adopted by laminating | stacking the 3rd sheet | seat 5 two layers. Also according to this aspect, the bent portion Z can be provided in the portion W immediately after the protrusion, and the rapid bending in the portion W immediately after the protrusion can be suppressed.

  The present invention is not limited to the above-described embodiment, and various modifications can be made within the scope described in the claims. For example, in the above-described embodiment, the input side end fixing portion Y and the output side end fixing portion Y are described as examples. However, as described above, the wiring pattern is used for the application purpose. Depending on the wiring pattern, the input side end fixing portion Y and the output side end fixing portion Y may be provided in an orthogonal direction. Moreover, although the 1st sheet | seat 3 and the 2nd sheet | seat 4 were comprised with the sheet | seat of the same thickness of the same raw material, for example, you may comprise the 1st sheet | seat 3 with the material which is hard to bend compared with the 2nd sheet | seat 4, The first sheet 3 may be made thicker than the second sheet 4 even with the same material. 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 structural requirement contained only in each description of each embodiment and modification which were demonstrated above, you may apply the structural requirement to another embodiment and modification.

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

Claims (5)

Optical fiber,
A wiring fixing portion for fixing the optical fiber with a predetermined wiring pattern;
An end fixing portion for fixing a portion of the optical fiber on the end side with respect to a portion fixed by the wiring fixing portion;
An optical fiber wiring sheet provided between the wiring fixing part and the end fixing part and having the wiring fixing part and a bent part that is more flexible than the end fixing part.   The optical fiber wiring sheet according to claim 1, wherein the end fixing portion is a portion that is more difficult to bend than the wiring fixing portion. The wiring fixing portion is a portion where the optical fiber is sandwiched in the thickness direction of the optical fiber by the first sheet and the second sheet,
The optical fiber wiring sheet according to claim 1 or 2, wherein the end fixing portion is a portion in which the optical fiber is wrapped in the circumferential direction by the first sheet. The wiring fixing portion is a portion where the optical fiber is sandwiched in the thickness direction of the optical fiber by the first sheet and the second sheet,
The end fixing portion sandwiches the optical fiber in the thickness direction of the optical fiber by the first sheet and the second sheet, and further wraps the optical fiber in the circumferential direction by 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.   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 end fixing portions are more flexible than the wiring fixing portions and the end fixing portions between the plurality of end fixing portions. The optical fiber wiring sheet according to any one of claims 1 to 4, wherein two bent portions are provided.