JPS58223643A - Method for coating light transmitting glass fiber and apparatus therefor - Google Patents

Abstract

PURPOSE:To coat a light transmitting glass fiber with a thin uniform resin layer, by spraying a carrier gas and a resin composition from the respective opening parts of a spray having plural concentric opening parts on the optical glass fiber after the wire drawing passing through the center of the opening part. CONSTITUTION:Hopper containers 11, 12, 13 and 14 having different sizes are placed on top of each other to give gaps between the respective containers to form plural paths (a), (b) and (c). Thus, a spray 4 having plural concentric opening parts (a'), (b') and (c') is prepared. A base material for an optical fiber is then melt drawn in a wire drawing furnace to give an optical fiber 1, which is then passed through the center of the opening part of the spray 4. A carrier gas and a resin composition are sprayed from the respective opening parts (a'), (b') and (c') on the optical fiber 1. Thus, a uniform pressure is applied to the optical fiber 1 from the circumferential direction, and the resin can be uniformly applied thereto without giving the vibration to the optical fiber 1.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a resin cutting method for a glass fiber for optical transmission (hereinafter referred to as an optical fiber) and an apparatus for the same.
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In addition, fiber has excellent transmission characteristics such as large capacity, low loss, and non-induction, and has the advantages of ITL and VL, and is about to be put into practical use as a new transmission method. Optical fiber is made of glass and is processed into a thin diameter of 200/1 m or less, so mechanical strength is one of the most important characteristics. In order to improve the improvement, a resin composition is applied immediately after melting and drawing the optical fiber J1'A to make it 1IIII, which maintains the virgin strength of the glass and prevents subsequent scratches. 1. The law has been adopted (Japanese Unexamined Patent Publication No. 100734/1982).

Conventionally, there have been various methods of applying this, such as the die-depping method, the felt method, and the spray method, but each has its advantages and disadvantages. So, type 1 depping method 1
However, the die stitching method is unable to form a coating film of 2 to 6 μm or less, and the spray method is difficult to form, and the spray method is difficult to form. It is difficult to cover without causing any movement, so it is preferable.

In the d-spray method of the present invention, vibration is applied to the optical fiber.
The present invention provides a method and apparatus capable of coating the resin composition without causing any damage, and in which the resin composition is applied from each opening of a sprayer having a plurality of concentric openings, and a line is drawn through the center of the openings. Karasunoaino 11 method for optical transmission, which consists of spraying towards a glass fiber for transmission,
In order to carry out the method described in -1-, a plurality of hopper-shaped containers of varying sizes are stacked one on top of the other with gaps between each container to form a plurality of passages, and the ends of the containers are placed in the passages. This invention relates to a glass fin-covered comb for light transmission, which is formed with a plurality of concentric openings.

A method of coating optical glass using the apparatus of the present invention will be explained and explained with reference to Figure 1. An optical fiber base material 1 is melted and drawn in a drawing furnace 2 to form an optical fiber 311-t. , touching other solid objects l″I
The resin is coated with the resin in the receiving device 4 of the present invention, turned into a fluorine in the baking furnace 5, and wound up in the winder 6.

7 is a recovery device W for the resin composition.

FIG. 2 schematically shows an example of the tearing device of the present invention. Figure 2 is an overall view of Al, and Figure 2 is a longitudinal cross-sectional view of the device. A plurality of passages a, b, c are stacked with gaps between them, and the passages form a plurality of openings 8', b', a' at the end of the container. A carrier gas (air, nitrogen, etc.) at the same pressure is supplied to the passage, and a resin composition is supplied to b.
When the resin composition is injected from the ring-shaped openings ' and a', the resin composition from the ring-shaped opening b' is formed into a forest shape, which is affixed to the optical fiber.

The ring-shaped openings a', b', and a' may be on the same transverse plane, but those that are upward toward the inside to form a conical shape, as shown in Figure 2 CB), It can be said that it is preferable from the point of view of spray uniformity, etc.

In the coating method using the apparatus of the present invention, since the drawn optical fiber is passed through the center of the ring, a uniform pressure is applied from the circumference (direction), and there is no possibility of vibration on the optical fiber.

Furthermore, it is possible to apply the resin composition to the circumferential surface of the optical fiber with a uniform thickness.

There are no particular restrictions on the resin composition used in the present invention, but it is preferable to use a resin composition that reacts with heat, ultraviolet rays, electron beams, etc.
Cps or less is desirable, and it is also possible to lower the apparent viscosity of the resin by keeping the coating device or sprayer at 60 to 80°C.

Explanation of 1111 Vinegar of 41 N I Figure 1 shows the overall flow when cutting frames into optical glass using the device of the present invention. 1. FIG. 2 shows a schematic diagram of the apparatus of the present invention, and FIG. 2 (A) is an overall view;
13) is a longitudinal sectional view.

Representative HJ Akira

Claims (2)

[Claims] (1) Same! Between each part of the atomizer having a plurality of circular openings, the resin composition is poured into the upper d1.
) A method for coating a glass fiber for C7 transmission, which comprises spraying toward the drawn optical transmission glass fiber passing through the center of the opening. (2) A plurality of hombar-shaped containers of different sizes are stacked one on top of the other with gaps between each j≠ container to form a plurality of passages, and the passages have a plurality of concentric openings at the ends of the containers. Glass fiber waveguide device for optical transmission.