JP3708196B2 - Optical connector constituent material and optical fiber mounting method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method of attaching an optical connector and a tape fiber provided at a rear branch point of an access / user optical communication cable, and a material used for the attachment.
[0002]
[Prior art]
In the conventional MT type optical connector, a connector is formed by a thermosetting resin material blended with a weatherable color pigment such as carbon black, and a thermosetting adhesive is used when an optical fiber attached to the connector is inserted. Used to adhere.
[0003]
[Problems to be solved by the invention]
When the conventional technology as described above is used, since the connector is formed of a thermosetting resin material blended with a weatherable color pigment such as carbon black, the resistance to ultraviolet rays is increased outdoors. On the other hand, even when a photo-curing type adhesive having a curing time faster than the thermosetting property is used, the curing light does not reach the inside of the ferrule, and the adhesive cannot be cured, so that it cannot be used.
[0004]
However, in connections where the connector is not exposed to sunlight, particularly ultraviolet rays, such as underground and aerial closures, there is little need for consideration of weather resistance, and the time required for connection work can be reduced by using a light curable resin as an adhesive. I got the knowledge that it could be shortened.
In the present invention, in order to be able to work by making use of such knowledge, without adding a weatherable color pigment such as carbon black in the connector forming material, the filler is further added to the optical connector forming material. A transparent connector is used by imparting transparency, and a photo-curing adhesive is used as an adhesive for inserting and bonding an optical fiber.
[0005]
[Means for Solving the Problems]
The present invention has been devised as a result of various studies to solve the above problems. The outline of the present invention is as follows: (1) a transparent MT connector plug molded with a resin containing no coloring material, and an optical fiber; An optical connector material composed of a photocurable resin for fixing an optical connector, an optical connector molded with a resin containing a light transmissive filler , and a photocurable resin for fixing an optical fiber The optical fiber end is a constituent material of an optical connector made of resin, and the end of the optical fiber with the connection end stripped off is inserted into the ferrule of the transparent optical connector made of the constituent material described in (1). The bonding is an optical fiber mounting method using an adhesive made of a photo-curable resin, projecting light to cure the resin, and bonding the end of the optical fiber and the ferrule.
[0006]
The photo-curable resin used in the present invention includes a polymerizable oligomer (acrylic, unsaturated polyester-based, butadiene-based, urethane-based, epoxy-based resin, etc.), a monomer as a reactive diluent, and a photoreaction start. A mixture of agents is the basic composition. A thermal polymerization inhibitor and a photopolymerization accelerator are added as necessary.
In particular, a material that exhibits an excellent adhesion effect by light projection as compared with an epoxy-based or cyanoacrylate-based thermosetting type can be obtained.
Of course, the photocurable resin includes not only visible light but also an ultraviolet curable resin. Examples thereof include epoxy acrylate, urethane acrylate, UV adhesive having a polymerization initiator, and the like.
In addition, in order to obtain a transparent connector, it is molded without adding a coloring pigment such as carbon black in a normal thermosetting resin, or is a non-carbon, light-transmitting filler. Can be obtained as a molded body that retains light transmittance.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to the drawings, an embodiment of the present invention will be described. FIG. 1 is an explanatory view of an embodiment of the present invention. An optical fiber tape core wire 1 is connected to a ferrule 5 of a transparent MT connector plug (housing) 4 via a rubber boot 3. Insert into. Reference numeral 2 denotes an exposed end portion of the optical fiber ribbon 1. Reference numeral 6 denotes an adhesive filling hole provided in the connector plug 4. With such a configuration, when an optical fiber core is inserted and filled with a photo-curing adhesive, external light is transmitted through the connector and irradiated to the adhesive, which is cured to make the optical fiber extremely strong. Can be easily joined.
Thereafter, the end face of the optical fiber core wire can be polished by a conventional method to make a connection with good characteristics.
[0008]
In general, the filler is blended into the mold resin for the purpose of preventing shrinkage of the molded product and improving the strength. In the present invention, for example, a glass filler is used, and the filler is molded by adjusting the shape and particle size of the filler. The product can be made transparent.
Even if carbon black is not added, the conventional filler is clouded and inferior in transparency, and only has a light transmittance of about 20% as compared with a transparent material. Therefore, the adhesive does not cure sufficiently with a short curing time.
In addition, the definition of transparency in the present invention does not necessarily need to be completely transparent with respect to curing light, and is intended to fall within the scope of the present invention if the transparency with respect to curing light is improved as compared with conventional products. .
That is, it can be said that if the curing time is shortened as compared with a connector blended with carbon black or a connector blended with a non-carbon white turbid filler, the transparency is imparted. Furthermore, the present invention can be applied not only to a multi-fiber connector but also to a single-fiber optical connector.
[0009]
According to the present invention, as a connector, the filler optically transparent a Ino Nkabon such are blended colorant such as carbon black is improved using a connector formulated extremely by the projection of the ray Easily cures the photo-curing adhesive filled inside and fixes the optical fiber core wire. Compared to the conventional thermosetting method, the insertion of the fiber should be confirmed visually. In addition, since no colorant such as carbon black is used, the kneading work of the material becomes clean and easy, the appearance of the connector is given a new transparency, and the fiber is fixed by light. It is simpler than the case of using, and effects such as safer work can be achieved.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an embodiment of the present invention.
[Explanation of symbols]
1 Optical fiber ribbon 2 Exposed end 3 Rubber boot 4 MT connector plug 5 Ferrule 6 Adhesive filling hole

Claims (2)

A molded transparent MT connector plug in does not contain a coloring material resin, Oite the optical connector construction material made of a photocurable resin for fixing the optical fiber, the molding resin of the optical connector, optical transparency An optical connector constituent material characterized by comprising a filler . The optical fiber end from which the coating of the connection end is peeled off is inserted into the ferrule of the transparent optical connector made of the constituent material according to claim 1, and the adhesive of the optical fiber end is bonded with an adhesive made of a photocurable resin. A method of attaching an optical fiber, characterized in that the optical fiber end and the ferrule are bonded by projecting light to cure the resin.

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