JPS5835836A - Formation of color picture tube fluorescent screen - Google Patents

Abstract

PURPOSE:To form a black matrix without using an exfoliation agent by a method wherein a positive type photosensitive film is removed by baking and concurrently powder, which is made contained, is made to change its color into black. CONSTITUTION:A positive type photosensitive resin film 3 containing powder, which blackens by baking, is formed inside of a panel 1, whereon phosphor films 2R, 2B and 2G luminous in three colors of red (R), blue (B) and green (G) are formed and mounted above by a shadow mask to perform an exposure. Only the part exposed by chemical treatment is made watersoluble, washed and developed so as to remove only the exposed part on the phosphor films 2R, 2B and 2G and to leave the positive type photosensitive resin film 3 containing powder, which blackens by baking, on the intervals among the phosphor films 2R, 2B and 2G. Subsequently a filming coat, an alminium evaporation film 5 are formed above the respective films 2R, 2B, 2G and 3 and treated by baking so as to form a black matrix film 6.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for forming a color picture tube fluorescent surface, and more particularly to a method for forming a black matrix film of a black matrix type color picture tube fluorescent surface.

Generally color picture tube fluorescent surface, red (phantom), blue (II).

It is formed by regularly arranging phosphor pixels that emit light in three colors on the edge (G) in a dot or stripe pattern, and a black matrix as an image-tip absorbing material is formed between these in a part, resulting in nine compositions. It becomes.

Such a fluorescent surface is formed by the following method.

That is, first, a photocurable photosensitive resin film is formed on the inner surface of a face plate panel (hereinafter referred to as the panel), exposed to light through a shadow mask to cure the desired area to which the phosphor is applied, and then heated with hot water. Remove the uncured parts. Graphite slurry is then applied to the inner surface of the panel and dried to form a graphite film. After that, a release agent is injected to cause the photosensitive resin film to swell and become brittle, and then developed with water spray to peel and remove the photosensitive resin film and the graphite film coated on its upper surface. Openings are formed to expose the glass panel surface at the ridges to form a black matrix film. Next, phosphor picture elements are formed on the inner surface of the panel on which the black matrix film is formed. in this case,
This phosphor picture element is produced by the commonly used slurry method or dusting method.
).

A phosphor film in the form of three green (G) phosphor dots or stripes is formed. Thereafter, a black matrix type fluorescent surface is completed by forming a resin film, forming a metal reflective film, baking, or other known means on this fluorescent film.

However, in the above-mentioned method of forming a fluorescent surface, oxidizing agents such as hydrogen peroxide and hypochlorous acid nose are usually used as stripping agents that cause the photosensitive resin film to swell and become brittle. There were safety management problems associated with this process, it corroded the production equipment, and it required a large amount of money to dispose of the waste liquid.

Therefore, the present invention involves forming a positive photosensitive resin film containing black powder by baking after forming three-color fluorescent films, and then exposing the positive photosensitive resin film in the light-emitting portion of the fluorescent film to light. Then, by baking, the positive photosensitive resin film is removed, and at the same time, the contained powder is turned black.

The object of the present invention is to provide a method for forming a black matrix type fluorescent surface in which a black matrix film is formed without using a release agent.

Embodiments of the present invention will be described in detail below with reference to the drawings.

As shown in FIG. 1, fluorescent films 211, 21, and 2G that emit light in three colors, red (R), blue (1), and green (G), are formed on the inner surface of the panel 1 of the color picture tube, as shown in FIG. do. Next, as shown in FIG. 2, a positive photosensitive resin film 3 containing powder that is blackened by baking is formed on the inner surface of the panel 1 on which the fluorescent films 2R, 28, and 2G have been formed. Next, as shown in FIG. 3, a shadow mask 4 is mounted above the positive photosensitive resin film 3, and exposure is performed through the apertures of the shadow mask 4. Subsequently, a chemical treatment is performed to make only the exposed areas water soluble. Then, by washing with water, only the exposed portions on the fluorescent films 2B and 21.20 are removed, and as shown in FIG.
A positive photosensitive resin film 3 remains in the space between 211.20 and the powder that is blackened by baking. Next, a filming film and an aluminum vapor deposition film 5 are formed on the upper surfaces of these six films 2m, 2B, 2G and 3, and a baking process is performed to form a black matrix film 6 as shown in FIG.

A specific example will be explained below.

First, a fluorescent film was formed on the inner surface of the panel of a 14-type color tube. In this case, 3 parts by weight of diazonium salt (P-diethylaminobenzenediazonium chloride/zinc chloride double salt), 0.2 parts by weight of alginate propylene glycol ester (Kimitsu Kagakusei Kibaloid), polyvinyl alcohol (
Kuraray Poval 224) 0.1 part by weight and water 9
A photosensitive resin aqueous solution prepared in an amount of 6.7 parts by weight is spin-coated onto the inner surface of the panel at a rotation speed of about 20 rpm using a spin coating machine, and dried with an infrared heater to a thickness of about 0.5 mm.
A 1if photosensitive resin film is formed. Next, a shadow mask is attached and exposed on an exposure table for about 60 seconds at an exposure intensity of about 10 W/-. Since only the exposed portions of this photosensitive resin film become sticky, phosphor powder is applied to the inner surface of the panel to adhere the phosphor only to the exposed portions. After that, a fluorescent film was formed by blowing air under pressure 1 (-). By repeating the above operation three times, red (R), blue (1), and green (G) were formed.
) Three-color fluorescent films were formed. Next, 1.5 parts by weight of P-diethylatnobenzenediazonium chloride/zinc chloride double salt, polyN-vinylpyrrolidone (PVP manufactured by GAF, USA),
A positive photosensitive resin solution containing 2 parts by weight of A-90), 10 parts by weight of manganese carbonate, and 86 parts by weight of water was applied to the inner surface of the panel on which the three-color fluorescent films were formed at a rotation speed of about 20° rpm. The coating was spin-coated, and dried using an infrared heater to form a positive-type photosensitive resin film having a thickness of about 5 zm and containing black powder that was blackened by baking. Next, put on a shadow mask and place it on the exposure table at an exposure intensity of about 7 W/I/ and about 12
Expose for 0 seconds. Next, it was exposed to steam generated from aqueous ammonia for about 5 seconds, and then washed with water. With this operation,
Only the spaces between the fluorescent films (unexposed parts) remained, and the exposed parts (on the fluorescent films) were almost completely removed.

Thereafter, a film was deposited on these films and baked at about 430° C. for about 1 hour. Then, by baking with, the manganese carbonate in the positive photosensitive resin film containing manganese carbonate remaining in the space between each fluorescent film is changed to manganese oxide, and a black film is formed.
A black matrix film could be formed.

In the above embodiments, the case where the fluorescent film was formed by the dusting method was explained, but the present invention is not limited to this. Of course, a matrix film can be formed.

As explained above, according to the method for forming a black matrix film phosphor surface according to the present invention, after forming a three-color phosphor film on the inner surface of a panel, a positive type film containing a powder that turns black by baking is formed. A photosensitive resin film is formed, the positive photosensitive resin film on the fluorescent film is removed by fogging, and the positive photosensitive resin film in the gap between each fluorescent film is baked. At the same time, by blackening the powder contained in the positive photosensitive resin film to form a black matrix film, it is no longer possible to remove black material films such as graphite using dangerous oxidizing agents as in the past. This eliminates the need for a removal process, and provides extremely excellent effects in that a black matrix film can be formed simply, safely, and at low cost in a shorter process.

[Brief explanation of drawings]

1 to 5 are cross-sectional process diagrams of essential parts for explaining an example of a method of forming a fluorescent surface of a color receiver tube according to the present invention. 1...Panel, 2R, 2B, 2G...Luminescent film, 3...Positive photosensitive resin film containing powder that turns black by baking, 4...Shadow mask, 5・
...Aluminum vapor deposited film, 6...Black matrix film.

Claims (1)

[Claims] a step of forming three-color fluorescent films on the inner surface of the panel; a step of forming a positive photosensitive resin film containing powder that turns black by baking on the inner surface of the panel on which the fluorescent film is formed; a step of exposing the fluorescent film of the positive photosensitive resin film through a shadow mask; a step of removing the straight positive photosensitive resin film on the exposed fluorescent film by development;
a step of removing the straight positive photosensitive resin film in the space between each of the phosphor films by baking and blackening the powder contained in the positive photosensitive resin film to form a black matrix film; A method for forming a fluorescent surface of a color picture tube L7.