JP2003240975A - Optical fiber sheet - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To prevent a sheet from peeling off and to prevent dust from adhering to a side surface. SOLUTION: An optical fiber sheet 11 is formed by bonding two sheets 4 each having an adhesive layer 3 formed on a film 2 with an optical fiber 2 interposed therebetween. An adhesive 12 that solidifies after application is applied to the side surface 6 of the optical fiber sheet 11. Since the side surfaces of the optical fiber sheet 11 are covered with the adhesive 12 and the adhesive layer 3 is not exposed, and since the side surfaces are positively reinforced by the solidified adhesive, the two sheets once bonded are peeled off. There is little fear. Since the pressure-sensitive adhesive layer 3 is not exposed on the side surface, no dust adheres to the side surface.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical fiber sheet in which an optical fiber is wired between two sheets which are adhered together via an adhesive layer.

[0002]

2. Description of the Related Art FIG. 5 is a sectional view showing the vicinity of a side end portion of a conventional optical fiber sheet 1, in which a pressure-sensitive adhesive layer (pressure-sensitive adhesive) 3 is formed on one surface of a soft resin film 2. It has a structure in which two sheets 4 are bonded to each other with an optical fiber 5 sandwiched between them, and is used for wiring in an optical device.

[0003]

A conventional optical fiber sheet 1 of this kind is simply a sheet 4 having an adhesive layer 3 attached thereto as shown in the figure, and the adhesive layer 3 is provided on the side surface thereof.
Is exposed. As described above, since the pressure-sensitive adhesive layer 3 is exposed on the side surface of the sheet, there is a possibility that the two sheets 4 once bonded may be separated from the side surface in combination with the thick thickness of the sheet 4. Also, there is a drawback that dust easily attaches to the side surface.

In order to solve the above-mentioned drawbacks, it is conceivable that the edges of the two bonded sheets 4 are trimmed with a reinforcing tape to cover and reinforce the adhesive layer 3 exposed on the side surfaces of the sheets. In the method of reinforcing with this reinforcing tape, when the sheet shape becomes complicated, it is difficult to cope with the complicated shape.

The present invention has been made in order to solve the above-mentioned conventional drawbacks, and it is possible to obtain an optical fiber sheet in which the bonded sheets are less likely to be peeled off and dust is not attached to the side surface. Another object of the present invention is to provide an optical fiber sheet which can easily cope with a complicated sheet shape.

[0006]

DISCLOSURE OF THE INVENTION The present invention for solving the above-mentioned problems is directed to an optical fiber sheet in which an optical fiber is laid between sheets adhered via an adhesive layer, the optical fiber sheet being provided along a side surface of the optical fiber sheet. And a resin that covers at least the side surface exposed portion of the pressure-sensitive adhesive layer is formed.

A second aspect of the present invention is characterized in that, in the first aspect, an adhesive that solidifies after application is applied to the side surface of the optical fiber sheet to form a resin that covers the exposed side surface of the adhesive layer. .

According to a third aspect of the present invention, the optical fiber sheet of the first aspect is applied to a multilayer optical fiber sheet in which three or more sheets are bonded together via an adhesive layer.

[0009]

1 is a plan view of an optical fiber sheet 11 according to an embodiment of the present invention, FIG. 2 is a sectional view taken along the line A--A of FIG. 1, and FIG. 3 is an enlarged view of a main part of FIG. As shown in these drawings, the optical fiber sheet 11 includes two sheets 4 each having a pressure-sensitive adhesive layer 3 formed on one surface of a soft resin film 2.
In the illustrated example, the four optical fibers 5 are sandwiched and bonded together. The pressure-sensitive adhesive layer 3 is usually a rubber type,
An acrylic room temperature pressure sensitive adhesive (adhesive) is used.

Although it is the same as the conventional one in the above-mentioned range, the optical fiber sheet 11 of the present invention has at least the side surface exposed portion of the adhesive layer 3 (exposed to the side surface of the optical fiber sheet) along the side surface of the optical fiber sheet. A resin is formed to cover the adhesive layer 3 portion). In the embodiment, the adhesive 12 that solidifies after coating is applied to the side surface 6 of the optical fiber sheet 11.
Is applied to form a resin that covers the exposed side surface of the adhesive layer 3. Here, the adhesive that solidifies after application does not have the property of maintaining adhesiveness without being completely solidified even after a certain period of time, like the adhesive layer 3 applied to the film 2, and has a constant value. It means that it becomes hard and sticky. Therefore, the adhesive 1
As 2 there may be used various adhesives that do not maintain tackiness after coating and solidify at least after a certain period of time. For example, a silyl group-containing special polymer as a main component may be used. An adhesive (Super X: a trademark of Cemedine Co.) can be used.

The material of the film 2 may be the same as the conventional material, but for example, polyimide, polyethylene terephthalate, low density or high density polyethylene, polypropylene, polyester, nylon 6, nylon 6
6, films of ethylene-tetrafluoroethylene copolymer, poly-4-methylpentene, polyvinylidene chloride, plasticized polyvinyl chloride, polyether ester copolymer, ethylene-vinyl acetate copolymer, soft polyurethane are used. To be The combination of the materials of the upper and lower films is arbitrary, and the upper and lower films may be the same material or different materials. In the inside of the sheet 4, the optical fiber 2 is an optical fiber elemental wire (UV elemental wire, silicon elemental wire, or the like) coated on a bare fiber, or an optical fiber core wire on which a resin coating is further applied. However, if necessary, the outside portion of the sheet pulled out from the sheet 4 is appropriately reinforced, for example, by covering the loose tube with a loose tube optical fiber core wire. Further, the wiring mode of the optical fiber 2 inside the sheet 4 is arbitrary, and not limited to the case of the illustrated example in which the optical fibers 2 are separated and wired as the plurality of single-core optical fibers 2. Is arranged as a tape-shaped multi-core optical fiber in which tapes are arranged in a tape form, or only one single-core optical fiber 2 is arranged.

According to the above-mentioned optical fiber sheet 11, the side surface thereof is covered with the adhesive 12 and is not exposed.
The pressure-sensitive adhesive layer 3 will not be exposed. Further, the adhesive 12 applied to the side surface and solidified not only covers the side surface but also positively reinforces the side surface. Thus, since the side surface of the optical fiber sheet 11 is covered with the adhesive 12 and the adhesive layer 3 is not exposed, and since the side surface is positively reinforced by the adhesive 12 solidified, it is bonded once. There is little risk that the sheet 4 will peel off from the side surface. In addition, since the exposed adhesive layer 3 on the side surface of the optical fiber sheet 11 is eliminated, dust is less likely to adhere to the side surface. Further, even if the shape of the sheet 4 becomes complicated, it is easy to apply the adhesive 12 to the side surface, so that it is possible to easily cope with a complicated sheet shape as compared with the method of edging the edge portion of the sheet with the reinforcing tape. it can.

In the above description, the side surfaces on both sides of the optical fiber sheet 11 in the optical fiber wiring direction have been described, but it goes without saying that the side surface (front surface) 7 on the optical fiber drawing side and the side surface (rear surface) on the opposite side can also be applied. You can Further, the upper and lower two sheets 4 of the optical fiber sheet 11 are both
Although the pressure-sensitive adhesive layer 3 is formed on the film 2, the pressure-sensitive adhesive layer 3 may be formed on at least one of the sheets 4, and the other sheet may be the simple film 2.

The above-described embodiment is an optical fiber sheet 11 in which two sheets 4 are bonded together. However, like the optical fiber sheet 21 shown in FIG.
It can also be applied to a multi-layer optical fiber sheet in which (four in the illustrated example) are bonded via the adhesive layer 3. That is, in the illustrated example, the adhesive 12 is applied over the entire side surface 26 of the optical fiber sheet (multilayer optical fiber sheet) 21 in which the four sheets 4 are bonded together. If there are multiple layers,
Since it is considered that the sheet 4 is likely to come off,
The adhesive 12 effectively acts to prevent peeling. In addition, when the number of layers is increased, the area of the side surface is increased and the pressure-sensitive adhesive layer 3 is exposed more, so that dust is more likely to be attached, which effectively acts to prevent attachment of dust.

[0015]

According to the present invention, a resin such as an adhesive that covers at least the exposed side surface of the pressure-sensitive adhesive layer is formed along the side surface of the optical fiber sheet, and the pressure-sensitive adhesive layer is not exposed. Since the side faces are positively reinforced with resin, there is little risk that the two sheets that have been pasted will come off the side faces. Further, since the adhesive layer exposed on the side surface of the optical fiber sheet is eliminated, dust is less likely to adhere to the side surface. Further, even if the shape of the sheet becomes complicated, it is easy to apply the adhesive or the like to the side surface, so that it is possible to easily cope with a complicated sheet shape.

[Brief description of drawings]

FIG. 1 is a plan view of an optical fiber sheet according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is an enlarged view of a main part of FIG.

FIG. 4 is a cross-sectional view of an optical fiber sheet according to another embodiment.

FIG. 5 is a cross-sectional view in the vicinity of a side end portion of a conventional optical fiber sheet.

[Explanation of symbols]

2 films 3 Adhesive layer 4 seats 5 optical fiber 6, 26 Side (of optical fiber sheet) 11,21 Optical fiber sheet

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Kazuhiro Takizawa             1440 Rokuzaki, Sakura City, Chiba Prefecture Fujikura Sa Co., Ltd.             Inside the warehouse F-term (reference) 2H038 CA52

Claims (3)

[Claims] 1. An optical fiber sheet in which an optical fiber is laid between sheets adhered via an adhesive layer, and a resin covering at least a side surface exposed portion of the adhesive layer along a side surface of the optical fiber sheet. An optical fiber sheet characterized by being formed. 2. The optical fiber sheet according to claim 1, wherein an adhesive that solidifies after application is applied to the side surface of the optical fiber sheet to form a resin that covers the exposed side surface of the adhesive layer. . 3. The optical fiber sheet according to claim 1, wherein the three or more sheets are applied to a multi-layer optical fiber sheet laminated with an adhesive layer.