JPH02177233A - Manufacture of black matrix film of colour cathode-ray tube - Google Patents

Abstract

PURPOSE:To eliminate circular black portions on a fluorescent screen and improve quality of products by conducting special development in an inner surface of a glass panel with a spray nozzle which scans, like a fan, a film of photosensitive resin exposed in screen by ultraviolet ray, in parallel to a short leg direction of a rectangular glass panel. CONSTITUTION:A film of photosensitive resin 2 with specific composition is formed on an inner surface of a glass panel 1. The portion of the film of resin 2 corresponding to a hole of a shadow mask is exposed to be hardened by ultraviolet ray 4 through the shadow mask 3 provided apart from the inner surface of the panel 1 with a specific distance. The mask 3 is removed and the panel 1 is fixed and then a spray nozzle 7 having spray pattern spread like a fan to the inner surface of the panel 1 reciprocally scans from left to right end portions of the panel 1 with keeping a constant distance. An exposed and hardened portion 5 is left and an unexposed portion 6 is cleansed by hot water to eliminate circular black portions on the fluorescent screen. Quality of the products is thus improved.

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a method for reducing black marks on a fluorescent screen of a color picture tube.
The present invention relates to a method for producing an IJ film.

[Conventional technology]

Generally, in a black matrix type color picture tube, a phosphor screen is formed by filling the spaces between green, red, and blue phosphor pixels with a non-emissive light-absorbing material, such as graphite, in order to improve contrast. A film formed of this non-light-emitting light-absorbing material is called a black matrix film, and a method for forming this film will be explained below with reference to the drawings.

First, as shown in FIG. 2(a), a photosensitive resin film 2 whose composition is polyvinyl alcohol and ammonium dichromate (or a photosensitive resin film whose composition is polyvinylpyrrolidone and an azide compound) is formed on the inner surface of a glass panel 1. After forming ultraviolet light 4, ultraviolet light 4 is applied through a shadow mask 3 placed a certain distance from the inner surface of the panel as shown in FIG. 2(b).
A part of the photosensitive resin film 2 is photocured by exposure. At this time, the photosensitive cured portion 5 of the photosensitive resin film will later be green, blue,
Exposure is performed three times by changing the relative position of the light source and the glass panel at the position where each red phosphor pixel is formed. Next, the shadow mask 3 is removed, and as shown in FIG. By removing the unexposed portion 6 of the photosensitive resin film with
), only the photocured portion 5 of the photosensitive resin film remains on the inner surface of the glass panel 1. Next, as shown in FIG. 2(e), a graphite suspension is applied to the entire inner surface of the panel, dried to form a graphite film 11, and then immersed in sensitized hydrogen water to cure the photosensitive resin film. 5 to swell;
The black matrix film 12 is removed together with the graphite deposited thereon by hot water spray, and a black matrix film 12 is formed on the inner surface of the glass panel 1 as shown in FIG. 2(f).

[Problem to be solved by the invention]

However, in the above-mentioned method of manufacturing a color picture tube black matrix film, ultraviolet light is used as shown in FIG. 5(a). When developing the exposed photosensitive resin film, the developing water 10 is sprayed from the spray nozzle 9, which has a spray pattern that spreads conically over the inner surface of the glass panel 1, and is sprayed from the adjacent spray nozzle. The developing water and the overlapping portion 13 as shown in the plan view of FIG. 5(b)
is occurring.

In the overlapping area 13 on the panel inner surface of the developing water sprayed from this spray nozzle, the flow rate of the developing water is twice as much as that in the non-overlapping area, and is part of the photosensitive hardening area 5 of the photosensitive resin film. is eroded by developing water.

Furthermore, since the glass panel 1 is rotating at a certain speed during the development process, the overlapping portion 13 on the panel inner surface of the developing water sprayed by the spray nozzle 9 traces a trajectory as shown in 14. As a result, the overlapping portion 13 of the developing water sprayed (from the spray nozzle) on the inner surface of the panel passes through as the panel rotates, and the developing effect becomes excessive in the trajectory portion 14 compared to the non-overlapping portion 15. The area of the photosensitive hardened portion 5 of the film becomes smaller, and when a black matrix film is later formed, the area of the black matrix hole is small, resulting in annular film unevenness as shown in Figure 6, which makes it difficult to use as a color picture tube. When the phosphor screen is made to emit light, an annular black area is generated on the phosphor screen, and white uniformity cannot be achieved, which is a major problem in terms of product quality.

[Means to solve the problem]

The method for producing a color picture tube black matrix film of the present invention includes a photosensitive resin film screen-exposed with ultraviolet light;
A developing process in which a spray nozzle that diffuses fan-shaped in a direction parallel to the short side of a rectangular glass panel is reciprocated with a radius that is approximately the same as the radius of curvature of the inner surface of the glass panel, or The method includes a step of arranging a plurality of spray nozzles on the side surface of a rotating disk having approximately the same radius and performing a developing process while rotating the rotating disk.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIGS. 1(a) to 1(f) are diagrams showing the manufacturing process of the first embodiment of the present invention. First, as shown in FIG. 1(a).

After forming a photosensitive resin film 2 made of polyvinyl alcohol and ammonium dichromate (or a photosensitive resin film made of polyvinylpyrrolidone and an azide compound) on the inner surface of the glass panel 1, as shown in FIG. As shown, the portions of the photosensitive resin film 2 corresponding to the shadow mask holes are irradiated with ultraviolet light 4 through a shadow mask 3 placed a certain distance from the inner surface of the glass panel, and are photocured. At this time, the photocured portion 5 will be blackened later)
It is located at the position where the black matrix hole of the IJ film is formed, and at the position where each color phosphor pixel of 1f + red is formed at the rear edge of K. Exposure is performed three times by changing the relative position of the light source and the glass panel. conduct. Next, as shown in FIG. 1(C), the shadow mask 3 is removed, the glass panel 1 is fixed, and the spray nozzle 7, which has a spray pattern that spreads in a fan shape against the inner surface of the glass panel, is placed at a certain distance from the inner surface of the glass panel. The glass panel IK is scanned back and forth from the left end to the right end while maintaining the same temperature, and the unexposed part 6 of the photosensitive resin film is washed away with warm water. As shown in FIG. 1(d), the glass panel IK photosensitive resin film is photocured. Only part 5 was left on the inner surface of glass panel 1.

More specifically, as shown in FIGS. 3(a) to (C), the short side length is 4761u+, the long side length is 721.4jlj
l l Long side curvature 1500 dragon, short side curvature 1200
In a 32-inch color picture tube glass panel with a length of 1 m, R = = 15Q on the perpendicular line from the center point of glass panel 1.
Qin long side curvature center position O and length 1 = 1000
11. Attach the spray nozzle 7 having a fan-shaped spray pattern to the pipe z and the tip of the pipe so that the spray pattern and the short side of the glass panel are parallel, fix the glass panel, and move the spray nozzle in the direction of the long side of the glass panel. Development processing was performed by spraying developing water 8 while reciprocatingly scanning from the left end to the right end of the glass panel with the long side direction curvature center position 0 as the center. As a result, the trajectories of the developing water sprayed by the spray nozzle on the inner surface of the glass panel do not overlap with each other when the spray nozzle is scanned in half a reciprocating manner, and they do not overlap with each other when the spray nozzle is scanned in one reciprocal direction or more. Completely duplicate. As a result, the developing effect on the inner surface of the glass panel became uniform over the entire inner surface of the glass panel. As a result of experiments, in the development process of a photosensitive resin film in the process of manufacturing a high-resolution color picture tube black matrix film with a phosphor pitch of 0.31 μm, the smaller the particle size of the developing water, the better the fine development process. Specifically, the spray nozzle is TP11 manufactured by Sublaying Systems.
Use 001, pressure 2 to 4! The best results were obtained when development was performed for 10 minutes with 30 reciprocating scans using developing water at a temperature of 60°C.

Thereafter, as in the conventional method, a graphite suspension was applied to the entire inner surface of the glass panel as shown in FIG. The photocured portion 5 of the film is swollen and removed together with the graphite deposited thereon by hot water spray, as shown in FIG. 1(f) I
A black matrix film 12 was formed on the inner surface of the glass panel 1 as shown in c.

FIGS. 4A to 4C are diagrams showing the development process in the method for forming a color picture tube black matrix film according to the second embodiment of the present invention. When developing a glass panel for a 32-inch color picture tube, which is the same as in the first embodiment, the glass panel 1 is fixed, and the center of curvature in the long side direction of the glass panel is
Spray nozzle 7 (Subrei Ink Systems Co., Ltd. $1 TP11001) with jetting characteristics that spreads in a fan shape on the side of a rotating disk in which a water pipe with a thickness of 20111 ml is embedded and a water pipe of 1 = 1000 mm and a thickness of 20111 ml centered on Install 58 pieces so that they are parallel to each other,
Arrange the hollow disk 16 so that the long sides of the glass panel are parallel to each other, and rotate the hollow disk 16 at a speed of 1 while spraying developing water.
[r.

The film was developed by rotating it in one direction (p, m) for 1 minute.

As a result, the trajectory of the developing water sprayed from the spray nozzle on the inner surface of the glass panel completely overlaps with the trajectory of the developing water sprayed from the adjacent spray nozzle on the inner surface of the glass panel. As a result, the developing effect on the inner surface of the glass panel became uniform over the entire inner surface of the glass panel, and thereafter a good black matrix film could be formed as in the first example.

In this example, the amount of developing water on the inner surface of the glass panel per unit time is 10 times that of the first example, so the same developing process can be completed in a very short time, so it can be used in a mass production line. The advantage is that the number of products produced per unit time can be increased.

〔Effect of the invention〕

As explained above, the present invention uses a spray nozzle that diffuses a photosensitive resin film screen-exposed with ultraviolet light in a fan shape in a direction parallel to the short side of a rectangular glass panel to the radius of curvature of the inner surface of the glass panel. A process of developing by performing reciprocating motion with approximately the same radius, or a process of developing while rotating the rotating disk by arranging a plurality of spray nozzles on the side surface of a rotating disk whose radius is approximately the same as the radius of curvature of the inner surface of the glass panel. Since the trajectory of the developing water sprayed from the spray nozzle on the inner surface of the glass panel completely overlaps with each other on the entire inner surface of the glass panel, or does not overlap with each other, the developing effect on the inner surface of the glass panel is It has the effect of being able to form a uniform color picture tube black matrix film that is uniform over the entire surface and has no film unevenness.

[Brief explanation of the drawing]

1(a) to 1(f) are diagrams showing the process of forming a color picture tube black matrix film according to the first embodiment of the present invention, and FIGS. 2(a) to 2(f) are diagrams showing a conventional color picture tube black matrix film forming process. 3(a) to 3(C) are top views showing the developing process in the method for forming a color picture tube black matrix film according to the first embodiment of the present invention. The side view, front view, and FIGS. 4(a) to (C) are the second embodiment of the present invention.
A top view showing the development process in the IJ glass forming method, Figure 5 (a) and (b) are a cross-sectional view of the center of the circumferential disk, and Figures 5 (a) and 5 (b) are the conventional color picture tube. A top view and a front view showing the development process in the IJ glass forming method, and FIG. 6 are diagrams showing film unevenness caused by the conventional color picture tube black matrix film forming method. 1...Glass panel, 2...Photosensitive resin film, 3...
・Shadow mask, 4...Ultraviolet light, 5...Photosensitive hardened area, 6...Unexposed area, 7,9...Spray nozzle, 8°10...Development water% 11...Graphite membrane, 12
...Black Matrix @, 16...Hollow disk. Agent: Susumu Uchihara, Patent Attorney Figure 1, Figure 2, Figure 3, Figure 4, Figure 4, Figure 1, Figure 6, Section 6

Claims (1)

[Scope of Claims] 1. A method for manufacturing a black matrix film for a black matrix color picture tube in which a phosphor screen is formed by filling the spaces between phosphor pixels with a non-light-emitting light-absorbing material, in which a photosensitive material screen-exposed with ultraviolet light; The method includes the step of performing a developing process by reciprocating the spray nozzle, which diffuses the elastic resin film in a fan shape in a direction parallel to the minor axis of the rectangular glass panel, in the major axis direction with a radius that is approximately the same as the radius of curvature of the inner surface of the glass panel. A method for manufacturing a color picture tube black matrix film, characterized in that: 2. In a method for manufacturing a black matrix film for a black matrix type color picture tube, in which a phosphor screen is formed by filling the space between the pixels of a phosphor screen with a non-light-emitting light-absorbing substance, a photosensitive resin film screen-exposed to ultraviolet light is used as a glass panel. A color characterized by having a step of arranging a plurality of the above spray nozzles on the side surface of a rotating disk having a radius of curvature that is approximately the same as the radius of curvature of the inner surface and having a water pipe embedded therein, and performing a developing process while rotating the rotating disk. A method for producing a picture tube black matrix film.