JP2819519B2 - Cover member for reinforcing device of optical fiber connecting portion and method of manufacturing the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cover member for an optical fiber connecting portion in which a transparent thermoplastic resin is coated on one side of a low-expansion transparent crystallized glass substrate, and a method of manufacturing the same.

[0002]

2. Description of the Related Art As one method of connecting the ends of optical fibers, there is a so-called fusion method in which the ends are heated and fused to each other. In order to enhance the reliability of the stiffener, it is desirable to fix it to the stiffener.

Conventionally, various types of reinforcing devices have been proposed, one of which is shown in FIG.
A thermoplastic resin 10 is provided on one side of a metal substrate 10a as shown in FIG.
b, and a cover member 11 in which a transparent thermoplastic resin 11b is coated on one surface of a low-expansion transparent crystallized glass substrate 11a is proposed.

[0004] The optical fibers 12, 1
In order to fix the connection portion 2, the base member 10 is disposed with the covering surface of the thermoplastic resin 10b facing up, and then the optical fibers 12, 12 whose distal ends are connected by fusion.
Is placed such that the connection portion is located substantially at the center of the base member 10. Next, the transparent thermoplastic resin 1
After the cover member 11 is overlapped with the covering surface of 1b facing down, the thermoplastic resin 10b, 10b is heated.
b is softened and melted, the base member 10 and the cover member 11 are bonded to each other, and the connection portions of the optical fibers 12 are fixed.

[0005] The reinforcing device for an optical fiber connecting portion in such a form allows the base member 10 and the cover member 11 to be easily adhered to each other by automatic heating and pressure bonding by electromagnetic induction. Since the cover member 11 is transparent, the position of the optical fiber can be confirmed when the base member 10 and the cover member 11 are bonded or after bonding.

[0006]

However, the fact that the cover member 11 is transparent means that it is difficult to distinguish between the front and back sides of the cover member 11. In order to reduce the work time, it is required to develop a cover member 11 that allows easy identification of the front and back sides.

SUMMARY OF THE INVENTION In order to meet the above-mentioned requirements, the present invention provides an optical fiber having a structure in which a transparent resin is coated on one surface of a low-expansion transparent crystallized glass substrate, and which can easily distinguish between front and back. It is an object of the present invention to provide a cover member for a reinforcing device of a connecting portion and a method of manufacturing the same.

[0008]

Reinforcing dexterity cover member of the optical fiber connections of SUMMARY OF THE INVENTION Namely, the present invention, a portion of one surface of the transparent crystallized glass substrate of low expansion, the upper and lower color tone different 2
A marking having a layer structure is formed, and a transparent thermoplastic resin is coated over the entire other surface.

Further, according to the method for manufacturing a cover member for a reinforcing device for an optical fiber connecting portion of the present invention, a part of one surface of a low expansion transparent crystallized glass substrate is colored in a certain color by screen printing, and the colored portion is removed. In addition, a step of coloring to another color by screen printing, and a transparent pattern over the entire other surface.
Bright thermoplastic resin characterized in that it comprises a step of thermocompression bonding.

The material of the transparent crystallized glass substrate used in the present invention is Li ₂ O 3 to 5 by weight percentage.
_{%, Al 2 O 3 20~35%} , SiO 2 55~70
_{%, TiO 2 1~3%, ZrO} 2 1~4%, P 2 O
₅ 1-5%, Na ₂ O 0-4%, K ₂ O 0-4
%, Na ₂ O + K ₂ O 0.5 to 4%,
Precipitates β-quartz solid solution crystals and has a coefficient of thermal expansion of -10 to 1
Those having a concentration of 5 × 10 ⁻⁷ / ° C. (30 to 750 ° C.) are preferred.

As the transparent thermoplastic resin, those which can be thermocompressed and have excellent durability are suitable, and for example, an ethylene-vinyl acetate copolymer film (EVA film) is preferable.

When manufacturing the cover member of the present invention, a transparent crystallized glass plate having a large area may be prepared in advance, although a mark may be formed on a transparent crystallized glass plate having a predetermined size and thermocompression bonding of a resin may be performed. Thereafter, it is also possible to form markings at a plurality of locations on one side, and to thermocompress a transparent thermoplastic resin over the entire other side, and then cut to a predetermined size.

[0013]

With the cover member for a reinforcing device of the optical fiber connecting portion of the present invention, the color tone of the marking is different between when viewed from the glass surface and when viewed from the resin surface. As a result, the working time for bonding to the base member is reduced.

Further, since the marking is formed on a part of the glass substrate, the position of the optical fiber can be confirmed from a portion other than the marking forming portion when or after bonding to the base member. .

In the method of manufacturing a cover member according to the present invention, screen printing is performed twice. For example, a glass substrate having excellent transparency can be formed only by forming a marking by coloring in a single screen printing. When a thermoplastic resin is used, the markings look almost the same from both sides, which is not preferable.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on embodiments.

FIG. 1 is a perspective view of a cover member 11 of the present invention, wherein 11a is a transparent crystallized glass substrate,
11b is a transparent thermoplastic resin, and 11c is a marking.

The transparent crystallized glass substrate 11a, in weight _{percent, SiO 2 67%, Al 2} O 3 23%, Li 2
O 4%, TiO ₂ 2%, ZrO ₂ 3%, P ₂ O ₅
1%, to precipitate β-quartz solid solution crystals, -3 ×
It has a coefficient of thermal expansion of ^10.sup.-7 / .degree.
× 1 mm.

[0019] Some of the one surface of the transparent crystallized glass substrate 11a is at the upper side is black, the lower is Ma <br/> Kingu 11c is formed having a two-layer structure of the white, the other surface of the entire surface, 5 × 35
A transparent thermoplastic resin 11b made of an EVA film having a size of 0.2 mm is coated.

FIG. 2 is a plan view of the cover member 11 of FIG.
3 show bottom views, respectively. As is clear from FIG. 2, the marking 11c looks black from the front side of the cover member 11, that is, from the glass surface, while the cover 11 is clear from FIG. The marking 11c looks white from the back side of the member 11, that is, from the resin surface.

The cover member 11 was manufactured as follows.

First, a transparent crystallized glass substrate having a size of 50 × 50 × 1 mm is prepared.
A white epoxy coating is screen-printed to a thickness of 7 μm to be colored, heated and dried at 150 ° C. for 30 minutes, and then a black epoxy coating is applied to the colored portion with a coating of 7 μm.
A screen printing with a thickness of m was performed for coloring, followed by drying under the same conditions as above to form a marking.

Next, the transparent crystallized glass substrate is placed with the marking surface facing down, a transparent thermoplastic resin having a size of 50 × 50 × 1 mm is placed thereon, and a release film is further placed thereon. 0.2mm thickness at each corner
The transparent thermoplastic resin is transparently crystallized to a thickness of 0.2 mm by heating at 200 ° C. for 10 minutes while uniformly applying a pressure of 50 g / cm ² over the entire surface of the substrate. It was crimped on a glass substrate.

After that, when the spacer and the release film are removed, the marking 14 is formed on a part of one side as shown in FIG.
mm of the transparent thermoplastic resin 15 is coated transparent crystallized glass substrate 13 is formed, the transparent crystallized glass substrate 1
3 was cut using a slicer so as to have a size of 5 × 35 × 1.2 mm, thereby producing a cover member 11.

In the marking of the present invention, the color tones of the upper and lower layers are not limited to black and white, but needless to say, different colors may be used.

[0026]

As described above, the reinforcing member cover member of the optical fiber connecting portion of the present invention has a structure in which a transparent resin is coated on one surface of a low expansion transparent crystallized glass substrate,
Since two-layered markings having different upper and lower color tones are formed on the other surface, it is easy to distinguish between the front and back sides.

Further, since the marking is formed on a part of the glass substrate, the position of the optical fiber can be confirmed from a portion other than the marking forming portion at the time of bonding to the base member or at the time of bonding. .

[Brief description of the drawings]

FIG. 1 is a perspective view of a cover member for a reinforcing device of an optical fiber connecting portion according to the present invention.

FIG. 2 is a plan view of a cover member of FIG. 1;

FIG. 3 is a bottom view of the cover member of FIG. 1;

FIG. 4 is a perspective view of a 50 × 50 × 1 mm transparent crystallized glass substrate coated with a marking and a transparent thermoplastic resin.

FIG. 5 is a perspective view before assembling an optical fiber connecting portion and a reinforcing device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Base member 11 Cover member 11a Transparent crystallized glass substrate 11b Transparent thermoplastic resin 11c Marking 12 Optical fiber 13 Transparent crystallized glass substrate 14 Marking 15 Transparent thermoplastic resin

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-60-256107 (JP, A) JP-A-52-102747 (JP, A) Real opening Sho-58-105505 (JP, U) (58) Field (Int.Cl. ⁶ , DB name) G02B 6/24

Claims (2)

(57) [Claims] 1. A low-expansion transparent crystallized glass substrate is formed on a part of one surface thereof with a two-layered marking having different upper and lower color tones , and the entire other surface is coated with a transparent thermoplastic resin. A cover member for a stiffener of an optical fiber connection portion, comprising: 2. A step in which a part of one surface of a low expansion transparent crystallized glass substrate is colored to a certain color by screen printing, and then the colored portion is further colored to another color by screen printing. A method of thermocompression bonding a transparent thermoplastic resin over the entire surface of the optical fiber connection part.