JPH11119067A - Method of adding core identification code to optical fiber core and optical fiber core - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To add a bar code as an identification symbol to a very thin optical fiber core wire by a method of adding an identification symbol for managing a core connection state in a telephone station, and to provide a simple and easy method.
A method of attaching a barcode that can be easily added, further enhances the durability of the barcode display, and that does not impair the sharpness of the barcode display even when repeated reading by a contact barcode reader is performed. That is the task. A sheet S on which a barcode M is printed is vertically attached to an optical fiber core f, and the back surface is adhered to the optical fiber core f, and the excess length D is cut off and wound once. A heat-shrinkable transparent plastic tube t having an inner diameter larger than that of the optical fiber core wire f is superposed on the bar code printing surface and fitted, and the plastic tube t
Is heated and shrunk to fix the tube t and the sheet S to the optical fiber core f.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for adding an identification code to an optical fiber core, and more particularly to a method for adding an identification code for managing a connection state of a core in a central office. A bar code as an identification symbol can be clearly and simply and easily added to an extremely thin optical fiber core, and the durability of the bar code display can be improved. Even if the reading by the code reader is repeated, the clearness of the bar code display is not lost.

[0002]

2. Description of the Related Art A large number of optical fiber cores (including single cores, multiple cores, and cords) are laid out by gathering a large number of cables and forming a cable. Are directly printed and numbered, and the core connection state management of the intra-office wiring is performed using this numbering. By the way, in order to further improve the aggregation density of the optical fiber core, the diameter thereof is remarkably reduced to 1.7 to 2.0.
The cord diameter has been reduced from 1 mm to 1 mm recently. For this reason, it is extremely difficult to directly print and apply clear numbering that can be visually identified on the outer surface of the optical fiber core wire. Due to the exponential increase in the number, it has become a very difficult problem how to identify them by numbering. This is,
This is the current status of the method for identifying optical fiber cores in intra-office wiring. On the other hand, the former problem is a limitation problem caused by directly printing the numbering on the thin optical fiber, and the latter problem is a problem of the numbering method itself to cope with an increase in the number to be identified. Both problems can be solved at once if a barcode is added to the sheet and can be used as an identification symbol of the optical fiber. Because the bar code is printed on the sheet, it can be printed clearly regardless of the reduction of the diameter of the optical fiber core. Even if it is thin, the added identification symbol can be sufficiently read, and the number that can be identified by the bar code is infinite. Therefore, the increase in the number of optical fiber cores to be identified does not matter at all. By the way, there are the following two problems in adopting the identification method based on the barcode printed on the sheet. The first is how to efficiently and accurately affix the barcode printed sheet to the surface of the ultrafine optical fiber, and the second is how the display surface is read by a contact barcode reader. This is how to prevent damage (abrasion due to repeated rubbing of the barcode printing surface). Damage to the bar code display can result in erroneous readings and serious consequences of misconnection.

[0003]

SUMMARY OF THE INVENTION The present invention relates to an identification method using a barcode printed on a sheet.
It is necessary to devise a method of attaching the barcode-printed sheet so that the sheet can be easily and easily and accurately attached to the optical fiber core and fixed, and the barcode display surface can be effectively prevented from being scratched. It is an issue.

[0004]

Means taken to solve the above problem are constituted by the following elements (a) to (c). (B) The barcode-printed sheet is vertically attached to the optical fiber core wire, and the back surface is attached to the optical fiber core wire, and the excess length is cut off and wound once. A transparent plastic tube having an inner diameter larger than that of the fiber core and having heat shrinkability is superimposed on the barcode printing surface and fitted thereon. (C) The plastic tube is shrunk by heating, and the tube and the sheet are heated. To the optical fiber.

[0005]

[Operation] A barcode printed sheet is vertically attached to an optical fiber core, and the back surface is adhered to the optical fiber core and the excess length is cut off. It is wrapped around and stuck,
A bar code symbol will be attached so as to surround the entire circumference of the optical fiber. In this state, the inner diameter is larger than the optical fiber core, and a heat-shrinkable transparent plastic tube is superposed on the barcode printing surface and fitted, so that the plastic tube can be easily and easily attached to the optical fiber core. Be attached. When the plastic tube is heated while being fitted so as to cover the bar code display, the plastic tube shrinks and is tightly fixed to the bar code display surface. Therefore, the sheet on which the barcode is printed is protected by the transparent plastic tube, and its display surface is not damaged. When the contact type bar code reader is applied to the bar code display surface of the optical fiber core, the bar code can be read as a length equivalent to the diameter of the optical fiber core, so the optical fiber core is very fine. Nevertheless, the bar code can be read accurately.

[0006]

[Embodiment] Next, an embodiment will be described with reference to the drawings. The sheet S on which the barcode is printed (hereinafter, referred to as a “barcode sheet”) may be any of paper, synthetic paper, or a polymer film.
The length L is 82 mm, and a bar code M having a length of 63 mm is displayed on the bar. In order to facilitate handling such as winding around the optical fiber core and cutting off the excess length, it is desirable to use a material that is relatively strong. The barcode sheet S has a barcode printing layer 2 on the surface of a sheet body 1, an adhesive layer 3 on the back surface, and a release paper 4 laminated on the adhesive layer 3. For example, a number of optical fiber cores f are separated from the end of the optical fiber tape cord T, the release paper 4 is removed, and the barcode sheet S is vertically attached to the optical fiber core f and wound once. Then, the extra length D is cut along the cutting line X.
Excision along -X (see FIG. 5). In this state, the barcode sheet S is attached to the optical fiber core wire f by the adhesive layer 3 and temporarily fixed to the optical fiber core wire f. In a state where the barcode sheet S is wound once and adhered, a transparent heat-shrinkable plastic tube t is fitted. The fiber diameter of the optical fiber core wire f is 1 mm, and the thickness of the barcode sheet S is 0.1 mm. Therefore, the outer diameter in a state where this is wound once is about 1.2 mm. The plastic tube t is a crosslinked polyolefin transparent body, and has an inner diameter of about 1.6 mm before shrinkage and a thickness of about 0.2 mm in order to facilitate its fitting. Further, since the plastic tube t is for firmly fixing the bar code sheet S to the optical fiber core and protecting the bar code display surface, the plastic tube t may be extremely thin from this functional surface. It is necessary to have a certain degree of stiffness in order to improve the handleability, so that the thickness is as described above. The above-mentioned plastic tube t is fitted, and is shrunk by heating to be fixed to the optical fiber core wire f. After fixing the plastic tube t, a connector C is connected to the tip of each optical fiber core f. By reading the bar code display of the bar code sheet S wound and fixed around the optical fiber core wire f by a contact type hand bar code reader,
The identification symbol of each optical fiber core can be reliably read.

[0007]

[Effect] As described above, a barcode is printed on a sheet in advance, the sheet is wound around an optical fiber core, a heat-shrinkable transparent plastic tube is fitted, and the sheet is shrunk by heating to cover. The barcode display surface is protected by the same plastic tube as it is fixed, so the barcode display can be easily and easily added to the above optical fiber cable, and the barcode display is reliably protected from scratches. it can. Therefore, even if this is repeatedly read by the contact bar code reader, the bar code display surface is not damaged, and even if it is a fine bar code display, it can be read without error by reading by the contact bar code reader. .

[0008]

[Others] As described above, the present invention is most effective for adding an identification code to an extra-fine optical fiber core wire. For example, one tape connector is attached to an optical fiber tape in which several optical fiber core wires are taped. Even when this is handled as one unit, the present invention is applied to this, and an identification symbol by a bar code can be added to each optical fiber tape. In this case, the same effects as those described above are obtained. In this case, the inner diameter of the plastic tube is selected according to the size of the cross-sectional shape of the optical fiber tape to be fitted.

[Brief description of the drawings]

FIG. 1 is a plan view of a barcode sheet.

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

FIG. 3 is a plan view of the embodiment.

FIG. 4 is a sectional view taken along line BB of FIG. 3;

FIG. 5 is a sectional view of the embodiment.

FIG. 6 is a perspective view of an optical fiber tape cord to which the present invention is applied.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Sheet body 2 ... Printing layer (barcode printing layer) 3 ... Adhesive layer 4 ... Release paper S ... Barcode sheet (sheet which printed barcode) M ... Bar Code (bar code display) T: Optical fiber tape code C: Connector (optical fiber core connector) D: Extra length of sheet on which bar code is printed (Excess length) f: Light Fiber core wire t: plastic tube (transparent heat-shrinkable plastic tube) L: length of barcode sheet b: width of barcode sheet

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Keiji Ohashi 1440, Mukurosaki, Sakura City, Chiba Prefecture Inside Fujikura Sakura Plant (72) Inventor Shin Saito 1440, Musaki, Sakura City, Chiba Prefecture Inside Fujikura Sakura Plant ( 72) Inventor Keitaka Enomoto Nippon Telegraph and Telephone Corporation

Claims (2)

[Claims] 1. A bar code printed sheet is placed vertically on an optical fiber core wire, and the back surface is attached to the optical fiber core wire, and the excess length is cut off and wound in a single turn. A heat-shrinkable transparent plastic tube having an inner diameter larger than the wire is overlapped on the barcode printing surface and fitted, and the plastic tube is shrunk by heating, and the tube and the sheet are fixed to the optical fiber. A method for adding a core identification code to an optical fiber core. 2. An optical fiber coated with a barcode-printed sheet wound and adhered thereto, covered with a heat-shrinkable plastic tube and covered with the sheet.