JPH0714510A - Formation of fluorescent screen - Google Patents

Abstract

PURPOSE:To form a good fluorescent screen shape by forming and exposing a photosensitive resin film, then swelling the resin film under the conditions weaker than those for the primary development to perform the pre-development process immediately before the development in forming a fluorescent screen. CONSTITUTION:The heated water or heated fog having the prescribed temperature and pressure lower than those for the primary development is sprayed to a resin film 2 through nozzles 4 to swell the film 2, or a face panel 1 formed with the film 2 is dipped in the heated water having a prescribed temperature lower than that for the primary development to swell the film 2. The unwanted non-photosensitive portions can easily be peeled off. Mottles are generated when the film 2 is further spread and dried. The heated water or heated fog having the prescribed temperature and pressure under the conditions stronger than those for the pre-development process is sprayed to the film 2 in the wet state, the non-photosensitive portions are washed by water and removed, then the primary development is performed. The non-photosensitive portions are properly removed, and the desired completely round phosphor dots 2a are formed. Through holes H penetrating the phosphor dots 2a are not generated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluorescent film forming method,
More specifically, the present invention relates to a method for forming a fluorescent film of a color cathode ray tube including a step of exposing and developing a photosensitive resin film formed on the inner surface of the face panel.

[0002]

2. Description of the Related Art A process of forming a fluorescent film on an inner surface of a face panel in manufacturing a color cathode ray tube is shown in FIGS.
Describing with reference to (c) and (d), first, as shown in FIG. 2A, a phosphor suspension is applied to the inner surface of the bowl-shaped face panel (1) to form a photosensitive resin film having a predetermined thickness. (2) is adhered and formed. Next, as shown in FIG. 2B, after exposing the resin film 2 through an exposure table (not shown) through the mask (3) having a predetermined pattern, as shown in FIG. , The face panel (1) is rotated and nozzles (4) are formed on the entire surface of the resin film (2) from a distance of about 20 cm from a predetermined condition, for example, 1.5 to 2 kg / c at a temperature of 40 to 45 ° C.
Spray warm water (5) or warm mist with a pressure of m2. Then, the unnecessary unexposed portion of the resin film (2) is washed and removed with water to leave the exposed portion, and as shown in FIG. 2D, for example, one dot is about 10 μm on the inner surface of the face panel (1).
Red, green, and blue phosphor dots (or stripes) (2a) ... With a thickness of m and a diameter of 100 to 160 μm are formed in a predetermined pattern.

[0003]

The problem to be solved is that when developing the photosensitive resin film (2), water is suddenly sprayed on the resin film (2) with a strong pressure, so that unnecessary unexposed The phosphor dots (2a) are removed because the parts are irregularly shaped.
Side peripheral surface (2b) becomes rough and the dot shape deteriorates so that it does not become a perfect circle, or it overlaps with an adjacent dot (2a), or it penetrates through the central portion of the dot by water pressure and the through hole (H)
Occurs, which adversely affects the screen quality.

[0004]

SUMMARY OF THE INVENTION According to the present invention, a step of applying a phosphor suspension to the inner surface of a face panel to form a photosensitive resin film by adhesion, and exposing the resin film through a mask having a predetermined pattern. And a step of pre-development by uniformly swelling the resin film immediately before development, and spraying warm water or warm mist at a predetermined temperature and pressure onto the pre-treated resin film to remove unnecessary portions. Main development to form a fluorescent film having a predetermined pattern.

[0005]

According to the above technical means, the photosensitive resin film is formed on the inner surface of the face panel and exposed. Then, immediately before the development, the resin film is uniformly swollen under a condition weaker than the main development. The main development is performed to remove the unexposed portion of the resin film in a desired proper shape.

[0006]

EXAMPLE FIG. 1 shows an example of a fluorescent film forming method according to the present invention.
And FIG. 2 will be described below. First, as before,
When a phosphor suspension is applied to the inner surface of the face panel to form a photosensitive resin film (2) [see FIG. 2] on the inner surface of the face panel and then exposed through a mask (3), it is more exposed than immediately before the main development. The resin film (2) is uniformly swelled under weak conditions and subjected to pretreatment for development.

In the above-mentioned pre-development treatment, for example, a nozzle (4) sprays warm water or warm mist having a temperature and pressure lower than that of the main development onto the resin film (2) to swell the resin film (2). . Alternatively, the face panel (1) having the resin film (2) formed thereon is immersed (dipped) in warm water having a predetermined temperature lower than the main development to swell the resin film (2). Then, particularly unnecessary unexposed portions are easily peeled off.
After that, if it happens that the resin film (2) is partly peeled off only by swelling and then spreads and is dried, spots are formed. The unexposed portion is washed with water and removed by spraying warm water or warm mist at a pressure for main development. Then, the unexposed portion is properly removed to form a desired perfect circular phosphor dot (or stripe) (2a) .... At this time, the pressure at the time of main development can be carried out even if the pressure is lower than the conventional pressure, and at the same time, the through holes (H) penetrating the phosphor dots (2a) are not generated.

[0008]

According to the present invention, in forming the fluorescent film having a predetermined pattern on the inner surface of the face panel, after the photosensitive resin film is formed and exposed, just before the development, the resin film is weaker than the main development. Since the swelling was carried out and the pretreatment for the development was carried out, the desired good fluorescent film shape can be obtained by the main development, and the quality of the screen can be improved.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a fluorescent film forming method according to the present invention.

2A, 2B and 2C are process diagrams showing an example of a conventional fluorescent film forming method, FIG. 2A is a photosensitive resin film forming process, FIG. 2B is an exposing process, and FIG. 3D is a side sectional view showing a developing step, and FIG. 3D is a side sectional view showing a fluorescent film formed on the inner surface of the face panel.

[Explanation of symbols]

 1 Face panel 2 Photosensitive resin film 4 Nozzle

Claims (3)

[Claims] 1. A step of applying a phosphor suspension to the inner surface of a face panel to form a photosensitive resin film thereon, a step of exposing the resin film through a mask having a predetermined pattern, and immediately before development. A step of uniformly swelling the resin film and pretreatment for development, and spraying warm water or warm mist of a predetermined temperature and pressure onto the pretreated resin film to remove unnecessary portions and perform main development,
And a step of forming a fluorescent film having a predetermined pattern. 2. The pre-development treatment according to claim 1, wherein the nozzle is sprayed with warm water or warm mist under a condition weaker than the main development, onto the photosensitive resin film deposited on the inner surface of the face panel. And a method for forming a fluorescent film. 3. The method for forming a fluorescent film according to claim 1, wherein the pre-development treatment is to immerse a face panel on which a photosensitive resin film is adhered in warm water having a predetermined temperature.