JPH0473840A - Manufacture of phosphor screen black matrix film of color picture tube - Google Patents

Abstract

PURPOSE:To form a good black matrix film free from defect, and to improve production efficiency by wetting the inner surface of a glass panel with hot water after an etching liquid is wasted. CONSTITUTION:A graphite suspension liquid is applied to the inner surface of a glass panel 1 on which a setting resinous film sensitized and hardened is formed, and after it is dried, an etching liquid comprising hydrogen peroxide water and acid, is applied, soaked, and the setting resinous film is embrittled and swollen through chemical reaction. After the etching liquid is wasted, the desiccation of the inner surface of the glass panel 1 due to the heat of chemical reaction of the etching liquid, is prevented by applying hot water 3 blasted from a nozzle 4 to the inner surface of the glass panel 1, and the embrittlement and swelling of the setting resinous film are ensured. A good black matrix film free of defect can be formed thereby, and the productivity of a color picture tube can thus be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for manufacturing a phosphor black matrix film for a color picture tube.

[Conventional technology]

In general, in a black matrix type color picture tube, in order to improve contrast, the spaces between green, blue, and red phosphor pixels are filled with a non-light-emitting light-absorbing material, such as graphite, to form a phosphor. A film formed from this non-light-emitting light-absorbing material is called a black matrix film, and the following methods are available for forming this film.

First, the inner surface of the glass panel is cleaned with hydrogen fluoride and pure water, and then the inner surface is coated with a photosensitive resin liquid containing polyvinyl alcohol and ammonium dichromate, or a photosensitive resin containing polyvinylpyrrolidron and a bisazide compound. By applying the liquid and rotating the glass panel at high speed, the photosensitive resin liquid is spread uniformly over the inner surface of the glass panel.

Next, the photosensitive resin liquid is dried using a far-infrared heater and a blower arranged opposite to the glass panel to form a photosensitive resin film on the inner surface of the glass panel.

Next, a portion of the photosensitive resin film is photocured by exposure to ultraviolet light through a shadow mask placed a certain distance from the inner surface of the glass panel. At this time, the photosensitive cured resin film is located at a position where green, blue, and red color phosphor pixels will be formed later, and exposure is usually performed three times by changing the relative position 1 between the glass panel and the light source.

Next, remove the shadow mask and develop with warm water.
Only the photocured resin film remains on the inner surface of the panel.

Next, a graphite suspension is applied to the entire surface of the photosensitive cured resin film formed on the inner surface of the glass panel.

Next, the glass panel coated with the graphite suspension is rotated at high speed to spread the graphite suspension uniformly, and a far-infrared heater placed opposite the glass panel dries the graphite suspension to form a graphite film. After forming hydrogen peroxide and acid on the inner surface of the glass panel.

Apply a mixed solution (etching solution) such as alkali.

It is immersed and chemically reacted with the photosensitive cured resin film to make it embrittle and moisturize.

Next, the etching solution is discarded from the inner surface of the glass panel, and the cured resin film is removed together with the graphite film deposited thereon by hot water spray to form a black matrix film on the inner surface of the glass panel.

Next, green, blue, and red phosphor pixels are formed at each position of the black matrix hole, and a filming film is applied so that the aluminum film is smooth. After that, an aluminum film is formed by vacuum evaporation and heat treated. The filming film is burnt out and the black matrix film of the phosphor screen of the color picture tube is completed.

[Problem to be solved by the invention]

However, in the above-described conventional method for manufacturing a phosphor black matrix film for a color picture tube, as shown in FIG. When a black matrix film is formed, the photosensitive cured resin film in that area becomes brittle and does not swell and cannot be removed together with the graphite film deposited on it by hot water spray.
As shown in FIG. 5, a defect in the part 8 without a black matrix hole occurs, resulting in a defective color picture tube.
A problem has arisen in that production efficiency is reduced.

The object of the present invention is to provide a black matrix film without any defects;
An object of the present invention is to provide a method for manufacturing a phosphor screen black matrix film for a color picture tube with high production efficiency.

[Means to solve the problem]

The present invention is a green color formed on the inner surface of a glass panel.

In a method for manufacturing a phosphor screen black matrix film for a black matrix type color picture tube in which a phosphor screen is formed by filling spaces between three types of phosphor pixels, blue and red, and each of the phosphor pixels with a non-light-emitting light-absorbing substance, The method includes a step of moistening the inner surface of the glass panel with warm water after the etching solution is discarded.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a sectional view of the first embodiment of the present invention after the etching solution is discarded.

In the first embodiment, the inner surface of the glass panel is first cleaned with hydrofluoric acid and pure water, then a photosensitive resin liquid containing polyvinylpyrrolidone and a bisazide compound is applied to the inner surface, and the glass panel is rotated at high speed. After the photosensitive resin liquid is uniformly spread, it is dried using a far-infrared heater to form a photosensitive resin film.

Next, the shadow mask is attached to the glass panel, exposed to ultraviolet light to photosensitive harden the photosensitive resin film, then the shadow mask is removed and developed with warm water, leaving only the photosensitive hardened resin film on the inside of the glass panel. .

Next, a graphite suspension is applied to the inner surface of the glass panel.

After drying, an etching solution containing hydrogen peroxide and acid is applied and immersed, and the photocured resin film is made brittle and swells by a chemical reaction.

Next, as shown in FIG.
The inner surface of the glass panel 1 is moistened by applying.

Thereafter, both the brittle and swollen cured resin film and the graphite deposited thereon were removed by hot water spray, and a good black matrix film with no defects could be formed.

FIG. 2 is a cross-sectional view after discarding the etching solution, explaining a second embodiment of the present invention.

The second embodiment includes a glass panel 1 as shown in FIG.
Instead of applying hot water to the inner surface of the glass panel 1, the inner surface of the glass panel 1 is moistened by spraying hot water spray 5 from the spray nozzle 6 to form a good black matrix film without defects as in the first embodiment. I was able to do that.

In this embodiment, the inner surface of the panel can be uniformly wetted, and
It has the advantage of being economically inexpensive since only a small amount of hot water is needed.

〔Effect of the invention〕

As explained above, in the method of manufacturing the phosphor black matrix film of a color picture tube according to the present invention, warm water is applied to the inner surface of the glass panel after the etching solution has been disposed of, and the inner surface of the glass panel is moistened to remove the glass by the heat of the chemical reaction of the etching solution. By having a process that prevents the inner surface of the panel from drying, the cured resin film that has been photocured is reliably deoxidized and moistened, and both the cured resin film and the graphite deposited on it are removed, resulting in a good black without any defects. This has the effect of not only being able to form a matrix film but also improving the productivity of color picture tubes.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view after discarding the etching solution, explaining the first embodiment of the present invention, FIG. 2 is a cross-sectional view after discarding the etching solution, explaining the second embodiment of the present invention, and FIG. A cross-sectional view after discarding the etching solution to explain an example of a conventional method for producing a black matrix film for a phosphor screen. Figure 4 is a front view of the inner surface of a glass panel after discarding the conventional etching solution. Figure 5 is a diagram showing a glass panel without black matrix holes. FIG. 3 is a front view of a black matrix film with portions formed thereon. 1...Glass panel, 2...Panel holding device, 3.
...Hot water, 4...Nozzle, 5...Hot water spray, 6...
- Spray nozzle, 7... Portion dried by reaction heat of etching solution, 8... Portion without black matrix holes, 9... Black matrix film.

Claims (1)

[Claims] Fluorescence of a black matrix color picture tube in which three types of phosphor pixels of green, blue, and red are formed on the inner surface of a glass panel, and the space between each of the phosphor pixels is filled with a non-emissive light-absorbing material to form a phosphor screen. A method for producing a phosphor black matrix film for a color picture tube, comprising the step of moistening the inner surface of the glass panel with hot water after discarding the etching solution.