JPS60200204A - Manufacture of image fiber - Google Patents

Abstract

PURPOSE:To evade contamination due to dust and dirt and prevent the formation of foams due to the contamination by charging numbers of glass fibers for picture element lines in a glass pipe and then irradiating them with ultraviolet rays while supply gas containing oxygen, etc., into the pipe, and heating and drawing the pipe. CONSTITUTION:Numbers of glass fibers (GF) constituting picture element lines are charged in the glass pipe and then while gas containing O2 or O3 is supplied into the glass pipe, the fibers are irradiated with ultraviolet rays. Then, the GFs and glass pipe are heated into one body and drawn thermally. Thus, the fibers are irradiated with ultraviolet rays while O2 or O3 is flowed into the GF bundle in the glass pipe to oxidize and dissolve away organic dust which causes the formation of forms, e.g. human skin and sweat, dirt, oil, solvent, smoke, fiber, etc., suspended in air. Ultraviolet rays with short wavelength are used preferably for the oxidation. The obtained image fiber contains no air foam among picture element lines, so an image of good quality is transmitted.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a method of manufacturing an image fiber having a large number of pixel lines.

<Prior art and its problems> Usually, one image fiber is composed of many pixel lines. Such an image fiber constitutes a pixel line consisting of a core and a cladding. However, in this image fiber manufacturing method, if dirt or foreign matter gets mixed in on the inner surface of the glass tube or between the glass fibers, the dirt or foreign matter will be removed during heating and integration. It decomposes and generates bubbles that get mixed into the stretched image fiber, causing defects in the transmitted image and significantly deteriorating the image quality. .

Conventionally, countermeasures against this problem have been taken, such as cleaning the glass tube and the glass fiber before filling it. However, unless the environment is extremely clean during the process of cleaning the glass fibers and filling them into the glass tubes, it is impossible to avoid contamination of the surfaces of the glass fibers and the inner surfaces of the glass tubes with dust floating in the air. Dust and dirt between the glass fibers filled in the glass tube can be removed by wet cleaning using water, organic solvents, acids, etc., as the gaps between the glass tube and the glass fibers and between the glass fibers are very narrow. That is impossible.

<Object of the Invention> The present invention has been made to solve the above drawbacks of the prior art, and involves filling a glass tube forming an image fiber with a large number of glass fibers constituting a pixel line, heating them together, and heating them. The overall object of the present invention is to provide a method for producing an image nozzle which avoids contamination due to dust and dirt during stretching and provides an excellent transmitted image free of air bubbles due to contamination.

Concrete Means for Solving the Problems> The method for manufacturing an image fiber according to the present invention that achieves the above object is to fill a glass tube with glass fibers constituting pixel lines, integrate them by heating, and then heat-stretch them. In the method for manufacturing image fibers, a glass tube is filled with a large number of glass fibers constituting pixel lines, a gas containing phosphorus or ozone is supplied into the glass tube, and ultraviolet rays are irradiated, and then the The method is characterized in that a glass fiber and a glass tube filled with the glass fiber are integrated by heating, and then heated and stretched.

<Example> An implementation of a method for manufacturing an image fiber according to the present invention will be described.

In addition to cleaning a quartz tube with an outer diameter of 20 wm and a wall thickness of 1.5 m, the refractive index difference of 2 cm makes up pixel a.

413,000 quartz glass fibers with an outer diameter of 150 μm are bundled, cleaned, aligned in parallel, and inserted into the glass tube. In such a glass tube oxygen gas 'fc 100 c
While supplying at a ratio of c/wh, a single low-pressure mercury lamp was irradiated outside the glass tube from a distance of about 30 + W + towards the glass tube for about 30 minutes. After death, the glass tube was placed together with a bundle of glass phino The fibers were heated and integrated to form a rod shape, and then the lower end was heated and stretched into a rainbow fiber shape to form an image fiber with an outer diameter of 1 m. The resulting image fiber did not contain any air bubbles that would cause contamination, and it was possible to obtain an image fiber that transmitted images of extremely high quality.

According to one method of manufacturing an image fiber according to the present invention, after glass fibers are filled into a glass tube and before being heated and integrated, ultraviolet rays are irradiated while flowing a gas containing oxygen or ozone between the glass fiber bundles in the glass tube. By oxidizing and decomposing organic contaminants, it has become possible to manufacture an image fiber with excellent transmission image quality without generating bubbles. Dirt on the inside of the glass tube, on the surface of the glass fiber inserted into the glass tube, and between the glass fibers includes human sebum (organic), sweat (organic and inorganic), dust and oil floating in the atmosphere, solvent(
These include inorganic dust, smoke (inorganic), natural fibers (organic), and chemical fibers (organic).

In the present invention, organic contaminants introduced between the glass tube and the glass fiber during the manufacturing process are irradiated with ultraviolet rays at the same time as the 03 gas gold is supplied to the glass tube and the glass fiber, creating a strong oxidizing effect and reducing the volatile content. The decomposition of substances such as carbon dioxide, water, and nitrogen gas removes pollutants. In the present invention, it is preferable that the wavelength of the ultraviolet rays used for oxidation is short, that is, it has high energy. Table 1
shows various chemical bond energies.

Table 1 If the irradiated ultraviolet rays have an energy higher than the chemical bond energy shown in Table 1, it can completely break the bonds of substances, and if 02 or 03 is present, these substances can be completely oxidized and volatilized. I can do it. Oxidizing power is 0 than 03
3 is more powerful. Therefore, 0@ is affected by extremely short wavelength ultraviolet irradiation, 02 → 010.

Osk is generated by the reaction O+ 02 → 0 Hatake. Therefore, 0. Using gas is also effective. ``Low-pressure mercury lamps can be used as ultraviolet light sources. The wavelength of the generated ultraviolet rays is 0.185 μm (155 kcal
/1nol) and 0.254 Jim (113kca
1%nol) is strong, and most of the chemical bonds in Table 1 are cleaved.

Furthermore, if O2 is present, it is possible to generate O1 which has a strong oxidizing power. Further, in the description of the present invention, a case has been described in which a glass fiber bundle is filled in a glass tube, but it goes without saying that cleaning only the inner surface of a glass tube can be carried out in a similar manner.

<Effects> By applying the image fiber manufacturing method according to the present invention, it is possible to prevent the generation of air bubbles during heating and integration due to contaminants mixed between the glass tube and the glass fiber during the image fiber manufacturing process. This makes it possible to manufacture an image fiber that is heat-stretched and has no air bubbles between its pixel lines, allowing extremely high-quality image transmission.

patent applicant Sumitomo Electric Industries, Ltd. Representative,

Claims (1)

[Claims] In a method of manufacturing an image fiber, a glass tube is filled with a large number of glass fibers forming a pixel line, and the glass fibers forming a pixel line are filled in a glass tube and then heated and stretched to form a large number of pixel lines. After filling the fiber, the glass tube is irradiated with ultraviolet rays while supplying a gas containing oxygen or ozone, and then filled with the glass fiber and heated to integrate the glass tube, and then heated and stretched. A method for manufacturing an image fiber.