JP2003185848A - Optical fiber extra length processing sheet and method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical fiber extra length processing sheet that is simple in structure, space-saving and superior in handling workability for example, that has small optical loss against change in various environments, and that facilitates flame retardancy, and also to provide the processing method. <P>SOLUTION: This invention relates to the optical fiber extra length processing sheet in which the extra length portion of the optical fiber is fixed by means of two sheet base materials 1, 2. An adhesive layer is provided at least in one of the sheet base materials, with the extra length portion 3a of the optical fiber 3 sandwiched by the two sheet base materials and fixed by the adhesive layer. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention processes an extra length of an optical fiber used for an optical module, an optical device, an optical element such as an LD or PD and an optical communication device such as an optical connector, a printed circuit board, a closure or the like. The present invention relates to an optical fiber surplus length treatment method for storing and an optical fiber surplus length treatment sheet.

[0002]

2. Description of the Related Art In recent years, optical communication using optical fibers has become popular. The optical fiber needs an extra length for connection, maintenance, and inspection due to the peculiarities of its usage. However, the optical fiber has a problem in mechanical characteristics such as brittleness and is easily broken. Moreover, since it is easily bent by an external force or the like, micro vent is likely to occur, and optical characteristics such as optical loss due to it are likely to occur. Due to the above problem, various studies have been made on the handling, storage, and treatment of the extra length of the optical fiber.

For example, a tray may be provided as described in Japanese Patent Publication No. 2888787 or Japanese Patent Laid-Open No. 10-332.
As disclosed in Japanese Patent Laid-Open No. 944/944, a pocket type case is provided, or as described in Japanese Patent Laid-Open No. 10-206647, a notch is provided and stored therein, and
No. 221533, JP-A-10-232320, JP-A-10-221534, and Patent No. 28.
As described in Japanese Patent No. 93047, it has been proposed to wind the optical fiber around the notch (bending portion, protruding portion, winding portion) to treat the extra length portion of the optical fiber.

However, in these methods, the thickness of the storage container and the storage components becomes large, and the storage space becomes large. Therefore, when these extra length processing components are accumulated and stored, a considerably large area and a large size are obtained. There is a problem that the capacity becomes large and the entire apparatus becomes large.

Further, in these methods, since the regulation (fixation) for maintaining the curvature and shape of the optical fiber is a part, it is difficult to maintain a predetermined radius of curvature and shape, and changes in various environments occur. On the other hand, there was a risk of light loss such as micro vent. Furthermore, in these methods, there is a part where the weak and weak optical fiber is exposed, and there is a problem that the optical fiber is caught or broken or broken during handling or setting in the device. . Furthermore, recently, especially for surplus length processing parts, there is a strong demand for flame retardancy,
There is also a problem that it is difficult to deal with these methods.

[0006]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems in the prior art, and its object is a simple structure, space saving, and handling. It is an object of the present invention to provide an optical fiber extra length treatment sheet and an optical fiber extra length treatment method which have good workability in time and the like, generate little optical loss in response to changes in various environments, and are easily flame retarded.

[0007]

One of the optical fiber surplus treatment sheets of the present invention is one in which the surplus portion of the optical fiber is fixed by two sheet base materials, and an adhesive is applied to at least one of them. The extra length portion of the optical fiber is sandwiched between two sheet base materials provided with layers, and is fixed by the adhesive layer. Another feature of the optical fiber surplus treatment sheet of the present invention is that the surplus portion of the optical fiber is bonded and fixed to the adhesive layer of the sheet base material provided with the adhesive layer. And

The first optical fiber surplus length treating method of the present invention is for fixing the surplus length portion of an optical fiber by two sheet base materials, and at least one of which is provided with an adhesive. It is characterized in that the sheet base materials are adhered to each other via the adhesive layer so that the extra length portion of the optical fiber is sandwiched, and the extra length portion of the optical fiber is fixed. Also,
The second one is characterized in that the extra length portion of the optical fiber is adhered and fixed onto the adhesive layer of the sheet base material provided with the adhesive layer.

In the present invention, a flame-retardant material can be easily obtained by selecting a flame-retardant material as the above-mentioned sheet base material. Further, the sheet base material is preferably made of silicone rubber or foam material in terms of workability, flexibility and flame retardancy.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a partially crushed perspective view showing an example of the optical fiber surplus treatment sheet of the present invention,
FIG. 2 is a schematic sectional view thereof. 3 to 5 are schematic cross-sectional views of other examples of the optical fiber excess length treatment sheet of the present invention.

In the optical fiber extra length treatment sheets of FIGS. 1 and 2, the optical fiber 3 (the extra length portion 3a of the optical fiber is provided on the sheet base material 1 provided with the adhesive layer 4 via the adhesive layer. ) Is fixed while maintaining a predetermined curvature or shape, and another sheet base material 2 made of the same or different material as the material forming the sheet base material 1 is attached to the upper surface of The extra length of fiber is protected while maintaining a predetermined curvature or shape,
It is completely fixed in the sheet substrate.

In the optical fiber surplus treatment sheet of FIG. 3, a sheet base material 1 provided with an adhesive layer 4 and a sheet-like base material 2 provided with an adhesive layer 5 made of the same or different material. The extra length portion 3a of the optical fiber is sandwiched between the two, and is fixed in a state where a predetermined curvature or shape is maintained.

In the optical fiber surplus length treatment sheet of FIG. 4, in order to reinforce the end surface of the sheet base material in the optical fiber surplus length treatment sheet of FIG. A sealing material is applied over the circumference, and the end face protection layer 6 is provided.

In the optical fiber surplus length treatment sheet of FIG. 5, the surplus portion 3a of the optical fiber is fixed on the sheet base material 1 provided with the adhesive layer 4 while maintaining a predetermined curvature or shape. ing.

In the optical fiber surplus treatment sheet of the present invention, the sheet base material for fixing or protecting the optical fiber is not particularly limited, and a flexible sheet-like material is generally preferably used. It Specific examples of the sheet base material include, for example, a glass-epoxy resin composite substrate, a polyester film, a polyimide film, and a gel-like material, a rubber-like material, and a foam-like material of an organic material such as a rubber or a foam-like material made of silicone or polyurethane. Examples of the base material include sheets made of materials and the like, and any base material used in ordinary electronic parts and electric parts can be used. Further, the sheet base material of the present invention does not need to be flexible depending on the purpose of use,
It may be rigid. For example, a substrate made of a rigid polymer material, a ceramic substrate, or the like can be used, and any shape can be used. Particularly, from the viewpoint of flame retardancy and flexibility, a sheet substrate made of a silicone rubber made of a polyimide film and a flame retardant material and a foam-like material is preferably used.

The optical fiber fixed in the optical fiber surplus length treatment sheet of the present invention is appropriately selected according to the purpose of use of the optical fiber surplus length treatment sheet. For example, quartz-based or plastic single-mode optical fibers, multi-mode optical fibers, etc. are preferably fixed in the present invention. Further, the optical fiber may have an optical connection component such as an optical connector connected to both ends of the extra length portion.
It may be connected to an optical element such as D or PD.

In the present invention, as the adhesive forming the adhesive layer for fixing the extra length of the optical fiber, the curvature and the shape of the optical fiber are set with respect to the tension generated by bending of the fixed optical fiber. Any material can be used as long as it maintains and has an adhesive strength such that the optical fiber is not subjected to stress strain due to adhesion, for example, urethane-based, acrylic-based, epoxy-based, nylon-based, phenol-based, polyimide-based, Vinyl type, silicone type, rubber type,
Various pressure sensitive adhesives (adhesives) such as fluorinated epoxy type and fluorinated acrylic type, thermoplastic adhesives, and thermosetting adhesives can be used. A pressure sensitive adhesive and a thermoplastic adhesive are preferably used because of the ease of fixing the optical fiber.

The first method of the optical fiber surplus length treating method of the present invention can be implemented, for example, as follows. First, an extra length portion of an optical fiber is adhered and fixed to a sheet base material provided with an adhesive layer while maintaining a predetermined curvature or shape. The method of fixing the extra length of the optical fiber in a state of holding a predetermined curvature or shape is not limited in any way, and any method may be used.

After fixing the extra length portion of the optical fiber as described above, another sheet base material made of the same material as or a different material from the above-mentioned sheet base material is laminated thereon. An adhesive layer may be provided on the sheet base material to be laminated. As a result, the excess length portion of the optical fiber is sandwiched between the two sheet base materials, and the optical fiber excess length treatment sheet of the present invention fixed by the adhesive layer is formed. In addition,
The method for fixing the optical fiber in the optical fiber surplus length treating method of the present invention is not limited to the above case, and is carried out by an appropriate method depending on the purpose of use of the optical fiber surplus length treating sheet, the material used, etc. be able to. For example, when a thermoplastic adhesive is used in the adhesive layer, the adhesive layer may be pasted in a plasticized state by heating, and when a thermosetting adhesive is used, it is laminated. It may be cured by heating in the state.

The optical fiber surplus treatment sheet produced as described above may be provided with an end face protective layer for reinforcing the takeout portion of the optical fiber. Since it is usually used to reinforce the takeout point of the optical fiber, the end face protective layer may be provided on the end face of the base material where the optical fiber is taken out from the end face or near the end face, but in order to improve the flame retardancy. In the case of the sheet base material, it is preferable to provide the sheet base material at or near the periphery of the sheet base material over the entire circumference thereof. The material for forming the end face protective layer is not particularly limited, and may be appropriately selected depending on the application purpose of the optical fiber surplus treatment sheet, but particularly silicone-based, epoxy-based, urethane-based or A sealing agent (filler) made of acrylic resin is preferably used.

The second method of the optical fiber surplus length treating method of the present invention is to bond the surplus length portion of the optical fiber to a sheet base material provided with an adhesive layer while maintaining a predetermined curvature or shape. And then fixed. The formed optical fiber surplus treatment sheet may be used as it is, but the surplus portion of the exposed optical fiber may be made of, for example, a synthetic resin paint or a hard coat material such as silicone. A protective layer may be formed. When used as it is, the adhesive layer may be attached to a substrate or the like on which the optical fiber extra length treatment sheet is placed.

The optical fiber to be subjected to the extra length treatment in the present invention as described above may be one in which an optical connecting component such as an optical connector is connected to both ends of the extra length portion. It may be connected to an optical element such as.

[0023]

EXAMPLES The present invention will be described below with reference to examples.
The present invention is not limited to this. Example 1 30% ethyl acetate of acrylic resin composed of n-butyl acrylate / methyl acrylate / acrylic acid / 2-hydroxyethyl methacrylate copolymer (= 82/15 / 2.7 / 0.3 (weight ratio)) To 100 parts of the solution, 1.0 part of Coronate L (manufactured by Nippon Polyurethane Industry Co., Ltd.) was added and mixed to obtain an acrylic pressure-sensitive adhesive coating solution. Next, this coating solution is applied to one surface of a polyethylene terephthalate (PET) film having a thickness of 100 μm so that the film thickness after drying is 100 μm to form a pressure-sensitive adhesive layer, and a sheet substrate (size 100 mm × 100 mm) was prepared. On the pressure-sensitive adhesive layer of the sheet base material, 1.3 m optical fiber nylon core wire (manufactured by Furukawa Electric Co., Ltd .: quartz-based single mode fiber core wire, with MU connectors connected at both ends,
0.9 mm diameter) was wound 5 turns so that the minimum radius of curvature was 40 mm, and fixed so that the extraction length at both ends of the optical fiber core was 5 cm from the sheet end surface.
On the sheet substrate on which the extra length of the optical fiber core is fixed, a PET film with a thickness of 100 μm (size 100 m
m × 100 mm) to obtain an optical fiber surplus treatment sheet of the present invention.

The obtained optical fiber surplus treatment sheet contains an optical fiber with a length of 1 m or more in a size of 10 cm square, is very thin with a thickness of about 1 mm, and has a small installation space. It was also possible to stack several surplus length processing sheets. Even when the MU connector pulled out from the optical fiber surplus length treatment sheet and the connector attached to another element are connected, the optical fiber surplus length treatment sheet can be easily connected without any problem. It was In addition, the extra length of the optical fiber is two P
Since it is sandwiched between ET films, there is no damage to the optical fiber during handling or setting inside the device.
The work efficiency was very good. In addition, when measuring the optical loss of the optical fiber, it shows that the optical fiber is fixed on the adhesive layer with a constant curvature, so that it shows almost the same value as when the extra length of the optical fiber is linear. , It was found that no light loss occurred.

Example 2 An optical fiber extra length treatment sheet of the present invention was obtained in the same manner as in Example 1 except that a 125 μm polyimide film was used instead of the PET film. The obtained optical fiber surplus treatment sheet has 10 c of optical fibers with a length of 1 m or more.
It was stored in an m-square size, had a very thin thickness of about 1 mm, had a small installation space, and could be laminated with several sheets of the optical fiber surplus treatment sheet. Even when connecting the MU connector pulled out from the optical fiber surplus length treatment sheet and the connector attached to another element,
Since the optical fiber extra length treatment sheet is flexible, it was possible to easily connect it without any problem. Furthermore, because the extra length of the optical fiber is sandwiched between two polyimide films, it is easy to handle and set inside the device.
There was no breakage of the optical fiber and the work efficiency was very good. In addition, when measuring the optical loss of the optical fiber, it shows that the optical fiber is fixed on the adhesive layer with a certain curvature, and it shows almost the same value as when the optical fiber extra length is linear. , It was found that no light loss occurred.

Example 3 In the same manner as in Example 1, a sheet base material (size 100 mm × 100 mm) having a 100 μm-thickness adhesive layer formed on one surface of a 125 μm-thick polyimide film was prepared, and the sheet was prepared. On the adhesive layer of the base material, a 1.3 m optical fiber nylon core wire (manufactured by Furukawa Electric Co., Ltd .: quartz single mode fiber core wire;
(9 mm diameter) 5 so that the minimum radius of curvature is 40 mm.
It was wound in a turn and fixed so that the extraction length at both ends of the optical fiber was 5 cm from the end face of the sheet. A silicone foam coating liquid (TOSFOAM 53 manufactured by Toshiba Silicone Co., Ltd.) is placed on the sheet on which the extra length of the optical fiber is fixed.
The sheet base material made of silicone foam having a thickness of 1.5 mm prepared by using 10) was bonded to obtain an optical fiber extra length treatment sheet of the present invention.

The obtained optical fiber surplus treatment sheet accommodates an optical fiber having a length of 1 m or more in a size of 10 cm square, has a very thin thickness of about 2 mm, has a small installation space, and has a small optical fiber. It was also possible to stack several surplus length processing sheets. Even when connecting the MU connector pulled out from the optical fiber surplus length treatment sheet and the connector attached to another element, since the silicone foam is used on one of the sheet base materials, it is more flexible. I was able to connect easily without any problems. Furthermore, since the excess length of the optical fiber is sandwiched between two polyimide films and a silicone foam, there is no risk of damage to the optical fiber during handling or setting inside the device, and work efficiency is extremely high. Was very good. In addition, when measuring the optical loss of the optical fiber, it shows that the optical fiber is fixed on the adhesive layer with a constant curvature, so that it shows almost the same value as when the extra length of the optical fiber is linear. , It was found that no light loss occurred.

Example 4 In Example 3, a flame-retardant silicone rubber coating solution (SE1816CV, manufactured by Dow Corning Toray Co., Ltd.) was used in place of the sheet-shaped base material made of a silicone foam. An optical fiber surplus treatment sheet of the present invention was obtained in the same manner as in Example 3 except that a sheet base material made of a silicone rubber having a thickness of 1 mm was used.

The optical fiber surplus treatment sheet thus obtained contains an optical fiber having a length of 1 m or more in a size of 10 cm square, has a very thin thickness of about 1.5 mm, and has a small installation space. It was also possible to stack several sheets of optical fiber surplus treatment sheets. Even when the MU connector pulled out from the optical fiber surplus length treatment sheet and the connector attached to another element are connected, since the silicone rubber-like material is used for one of the sheet base materials, flexibility is improved. I was able to connect easily without any problems. Furthermore, since the extra length of the optical fiber is sandwiched between the polyimide film and the silicone rubber, there is no risk of damage to the optical fiber during handling or setting inside the device, and work efficiency is very good. there were. In addition, when the optical loss of the optical fiber was measured, the optical fiber was fixed on the adhesive layer with a constant curvature, and therefore the optical fiber extra length showed almost the same value as in the case of being linear, It was found that no light loss occurred.

Example 5 A silicone foam coating liquid (TOSFOAM 5500, manufactured by Toshiba Silicone Co., Ltd.) and an adhesive coating liquid having the same composition as in Example 1 were used to form an adhesive layer having a thickness of 100 μm after drying. A sheet made of a silicone foam having a thickness of 1.5 mm is prepared and has a size of 100 mm × 100 m.
After cutting into m, two sheet-like base materials were prepared. On the pressure-sensitive adhesive layer of one of the sheet base materials, a 1.3 m optical fiber nylon core wire (manufactured by Furukawa Electric Co., Ltd .: quartz-based single mode fiber core wire, 0.9
(mm diameter) was wound 5 turns so that the minimum radius of curvature was 40 mm, and fixed so that the extraction length at both ends of the optical fiber core was 5 cm from the end face of the sheet. The sheet-shaped base material of the other silicone foam was bonded to the sheet base material to which the surplus length of the optical fiber was fixed, to obtain an optical fiber surplus treatment sheet of the present invention.

The obtained optical fiber surplus treatment sheet contains optical fibers with a length of 1 m or more in a size of 10 cm square, is very thin with a thickness of about 3 mm, has a small installation space, and the optical fiber It was also possible to stack several surplus length processing sheets. Even when the MU connector pulled out from the optical fiber extra length treatment sheet and the connector attached to another element are connected, since the sheet base material is a silicone foam, it is more flexible to the extra length treatment sheet. There was no problem and I could connect easily. Furthermore, since the extra length of the optical fiber is sandwiched between two silicone foams, there is no risk of damage to the optical fiber during handling or setting inside the device, and work efficiency is very good. there were. Also,
When measuring the optical loss of the optical fiber, the optical fiber is fixed with a constant curvature by the adhesive, and the optical fiber extra length shows almost the same value as when it is linear, and optical loss occurs. I found that I didn't.

Example 6 A silicone type filler (manufactured by Konishi Co., Ltd., Busbond) was applied near the end face of the optical fiber extra length treatment sheet obtained in the same manner as in Example 3 to take out the optical fiber, An optical fiber extra length treatment sheet of the invention was obtained. In the obtained optical fiber surplus treatment sheet, the extraction portion of the optical fiber surplus portion is reinforced, so that it is very easy to handle in connection with other optical components, and the workability is improved. was there.

Example 7 A flame-retardant silicone rubber coating liquid (TSE3834, manufactured by Toshiba Silicone Co., Ltd.) was applied over the entire circumference in the vicinity of the end face of an optical fiber surplus treatment sheet obtained in the same manner as in Example 3 to provide an end face protective layer. Was formed to obtain an optical fiber extra length treatment sheet of the present invention. The obtained optical fiber extra length treatment sheet, the extraction portion of the optical fiber extra length portion is reinforced,
In connection with other optical components, there are effects that handling is very easy, workability is improved, and flame retardancy is also improved.

Example 8 In the same manner as in Example 1, a sheet base material (size 100 mm × 100 mm) having a pressure-sensitive adhesive layer having a thickness of 100 μm formed on one surface of a PET film having a thickness of 100 μm was used.
I prepared one. M on both sides of the sheet base adhesive layer
A 1.3 m optical fiber nylon core (Furukawa Electric Co., Ltd .: quartz single mode fiber core, 0.9 mm diameter) to which a U connector was connected was wound 5 turns so that the minimum radius of curvature was 40 mm. The optical fiber extra length treatment sheet of the present invention was obtained by fixing the optical fiber core wires so that the extraction length at both ends was 5 cm from the end surface of the sheet. It adhered on the board | substrate which installs this optical fiber extra length processing sheet by the adhesive layer provided on PET.

The optical fiber surplus treatment sheet thus obtained contained an optical fiber having a length of 1 m or more in a size of 10 cm square, had a very thin thickness of about 0.5 mm, and had a small installation space. Further, since the optical fiber is fixed on the PET film, work efficiency was very good in handling and setting in the apparatus. Further, after the installation, the optical fiber was protected without being damaged because it was fixed to the PET film and the substrate. In addition, when measuring the optical loss of the optical fiber, it shows that the optical fiber is fixed on the adhesive layer with a constant curvature, so that it shows almost the same value as when the extra length of the optical fiber is linear. , It was found that no light loss occurred.

Flame Retardancy Test For the optical fiber surplus length treatment sheets of Examples 2 to 7, U
The flame retardancy test was performed according to the "20 mm vertical combustion test" in the L94 standard (combustibility test standard for plastic materials for parts of devices and appliances). As sample, length 12
Five samples having a width of 5 mm and a width of 13 mm were prepared, and the self-extinguishing property of each sample was confirmed and evaluated. That is,
The time taken for each sample to start flaming combustion and to extinguish the flame was measured, and the total flaming burning time of 5 samples and the maximum burning time were recorded. In this evaluation, if self-extinguishing property was observed without complete combustion, it was judged to be flame retardant. The results of this measurement are shown in Table 1. In the table, UL
94V-1 and UL94V-0 mean the classification symbols indicating the standard of flame retardancy in the above flame retardancy test.

[0037]

[Table 1]

As can be seen from Table 1, when the flame-retardant material was used as the sheet-shaped base material, a self-extinguishing material was obtained. Further, by using a silicone-based rubber-like material and foam-like material, the level of flame retardancy is improved, and by covering the end face with a flame-retardant material, it becomes non-flammable and a good flame-retardant effect is obtained. It became the one shown. Note that, after the flame was extinguished, the flammable combustion of the sample was restarted, but the second burning was not performed in all the samples of Examples 2 to 7.

[0039]

As described above, the optical fiber surplus treatment sheet of the present invention has a simple structure in which the surplus portion of the optical fiber is fixed to the sheet base material and is thin. ,
Space can be saved and workability such as handling is good. In addition, the entire length of the extra length of the optical fiber is adhered and fixed to the adhesive layer, and since a predetermined curvature or shape is maintained, light loss is unlikely to occur even if the environment changes, and Flame retardation can be easily achieved by selecting the material of the sheet base material. In particular, when the extra length portion of the optical fiber is sandwiched and fixed by two sheet base materials, it is protected by the sheet base material, and workability such as handling is further improved.

[Brief description of drawings]

FIG. 1 is a partially crushed perspective view of an example of an optical fiber excess length treatment sheet of the present invention.

FIG. 2 is a schematic cross-sectional view of FIG.

FIG. 3 is a schematic cross-sectional view of another example of the optical fiber excess length treatment sheet of the present invention.

FIG. 4 is a schematic cross-sectional view of another example of the optical fiber excess length treatment sheet of the present invention.

FIG. 5 is a schematic cross-sectional view of another example of the optical fiber excess length treatment sheet of the present invention.

[Explanation of symbols]

1 ... Sheet base material, 2 ... Sheet base material, 3 ... Optical fiber, 3
a: extra length of optical fiber, 4 ... adhesive layer, 5 ... adhesive layer, 6 ... end face protective layer.

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[Procedure amendment]

[Submission date] May 22, 2002 (2002.5.2)
2)

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0026

[Correction method] Change

[Correction content]

Example 3 In the same manner as in Example 2 , a sheet base material (size 100 mm × 100 mm) having a 100 μm-thickness adhesive layer formed on one surface of a 125 μm-thick polyimide film was prepared, and the sheet was prepared. On the adhesive layer of the base material, a 1.3 m optical fiber nylon core wire (manufactured by Furukawa Electric Co., Ltd .: quartz single mode fiber core wire;
(9 mm diameter) 5 so that the minimum radius of curvature is 40 mm.
It was wound in a turn and fixed so that the extraction length at both ends of the optical fiber was 5 cm from the end face of the sheet. A silicone foam coating liquid (TOSFOAM 53 manufactured by Toshiba Silicone Co., Ltd.) is placed on the sheet on which the extra length of the optical fiber is fixed.
The sheet base material made of silicone foam having a thickness of 1.5 mm prepared by using 10) was bonded to obtain an optical fiber extra length treatment sheet of the present invention.

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Masayoshi Suzuki             No. 3 Soba Town, Shizuoka City, Shizuoka Prefecture             Tomoegawa Paper Research Institute (72) Inventor Tatsushi Kobayashi             No. 3 Soba Town, Shizuoka City, Shizuoka Prefecture             Tomoegawa Paper Research Institute F-term (reference) 2H038 CA37 CA52                 5G363 AA07 BA10 DA20

Claims (9)

[Claims] 1. A surplus portion of an optical fiber, wherein an extra length portion of the optical fiber is sandwiched between two sheet base materials provided with an adhesive layer on at least one side and fixed by the adhesive layer. Long processing sheet. 2. The optical fiber surplus treatment sheet according to claim 1, wherein the sheet base material is made of a flame-retardant material. 3. The optical fiber excess length treatment sheet according to claim 1, wherein at least one of the sheet base materials is made of silicone rubber or foam material. 4. The optical fiber surplus treatment sheet according to claim 1, wherein one of the sheet base materials is a polyimide film and the other is made of flame-retardant silicone rubber or foam material. 5. The optical fiber excess length treatment sheet according to claim 1, wherein both of the sheet base materials are made of flame-retardant silicone rubber or foam material. 6. An adhesive provided on at least one side thereof.
An optical fiber surplus length treatment sheet, characterized in that a plurality of sheet base materials are bonded together via the adhesive layer so that the surplus length part of the optical fiber is sandwiched, and the surplus length part of the optical fiber is fixed. 7. An optical fiber surplus treatment sheet, characterized in that the surplus portion of the optical fiber is adhered and fixed to the adhesive layer of the sheet base material provided with the adhesive layer. 8. The sheet base material is made of flame-retardant silicone rubber or foam material.
Optical fiber extra length treatment sheet described. 9. An optical fiber surplus treatment method, comprising adhering and fixing an extra length portion of an optical fiber on the adhesive layer of a sheet base material provided with an adhesive layer.