JPH01200536A - Forming method of color phosphor screen - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for forming a color fluorescent surface of a cathode ray tube by a dry process method.

[Summary of the invention]

The present invention is a method for forming a color fluorescent surface using a dry process method in which a phosphor is injected into the inner surface of a panel and the panel is rotated to attach the phosphor to a desired area. A cover body with a cover is placed on the panel, and when the panel is rotated, the phosphor slides down along the direction of extension of the blades, so that the phosphor adheres uniformly to the inner surface of the panel. .

[Conventional technology]

One method of forming a color fluorescent surface of a cathode ray tube using the dry process method is to inject phosphor (powder) into the inner surface of the panel and attach the phosphor to the required areas while rotating the panel itself. Are known. That is, as shown in FIGS. 7 to 9, after forming a carbon stripe layer (2) in a predetermined pattern on the inner surface of the panel +1), which becomes a light absorption layer,
For example, a diazonium-based photosensitive liquid (which becomes sticky when exposed to n-light) is applied, dried (50°C), and this photosensitive coating IQ
(Step 31-1) The area where the first color phosphor layer, for example the blue phosphor layer, is to be formed is exposed to light to create tackiness in this area.

Next is the panel! 1) Inject a blue phosphor (4) into the panel, tilt the panel (1) and rotate it around its axis of rotation (5) to disperse the phosphor (4) (see Figure 8). ,panel! The blue phosphor is deposited only on the areas of the photosensitive coating (3) in 1) that have been made sticky by exposure, and then developed, i.e., the excess phosphor (4) is discharged, and high-pressure air is applied. to remove excess blue phosphor and form a blue phosphor stripe layer (6
B) is formed. Thereafter, in a commercial manner, the steps of exposing other areas of the photosensitive coating (3), adhering the phosphor by rotating the panel, and developing are repeated to form a second color green phosphor stripe layer on each corresponding area. (6G) and a third color red phosphor stripe la (6R) are formed to form the desired color phosphor surface (6). Note that when the panel (1) is rotated, the phosphor (4)
panel (1) to prevent it from scattering outside the panel.
It is also practiced to place a lid (7) on the top.

[Problems to be Solved by the Invention] However, in the method for forming a color fluorescent surface described above, the phosphor (4) injected into the panel (1) is
When the fluorescent material (4) is dispersed by its own rotation, the fluorescent material (4) mainly flows along the panel skirt section as shown by arrow a in Fig. 9, and is difficult to flow toward the center of the panel. Body adhesion is not uniform over the entire panel. Furthermore, if the phosphor (4) flows in a direction perpendicular to the carbon stripe layer (2), it becomes difficult to adhere to the carbon stripe layer (2). Especially when forming a fine pitch fluorescent surface, a carbon stripe layer (2
), the phosphor (4) is exposed to the carbon stripe layer (
2) It becomes difficult to get in between. Furthermore, if the phosphor (4) is not adhered uniformly, color mixing is likely to occur.

In view of the above-mentioned points, the present invention provides a method for forming a color phosphor surface in which each color phosphor can be uniformly dispersed and adhered to the inner surface of a panel.

[Means to solve the problem]

The present invention is a panel! In the method for forming a color fluorescent surface, in which the fluorescent material (4) is injected into the inner surface of the panel (1), the panel (1) is stretched out and rotated, and the fluorescent material (4) is attached to the required part. A lid body (12) integrally having a plurality of parallel blades (11) is arranged on the panel +11 so as to cover it,
When the panel (1) is rotated, the phosphor (4) inside the panel slides down along the extension direction of the blade (11), and the phosphor (4)
so that it is evenly distributed and adhered to the inner surface of the panel.

The vanes (11) are arranged along the longitudinal direction of the carbon stripe layer (2) formed within the panel (11).

In addition, there is a phosphor (4) between the blade (11) and the inner surface of the panel, which differs slightly depending on the characteristics of the blue, edge, and red phosphors.
A gap (dl) of about 1 to 2 cranes is provided through which some of the water can flow.

[Operation] According to the method of the present invention described above, when the panel (1) is rotated in an inclined state to disperse the phosphor (4), the phosphor (4) flowing along the panel skirt part is Each feather (1
It is blocked by the portion 1) and accumulates uniformly between each blade (11). When the angle of the collected part of the phosphor (4) is tilted to the maximum, the phosphor (4) slides down in the direction along the blade (11), that is, along the carbon stripe layer (2).

By repeating this process, the phosphor (4) is uniformly dispersed over the entire surface including the center of the panel, and the phosphor is attached only to a predetermined exposed area of the photosensitive coating. Furthermore, since the phosphor is uniformly deposited, color mixing is also prevented.

Furthermore, since the panel +1) is covered with the lid (12), the phosphor (4) will not be scattered outside the panel during rotation.

〔Example〕

Hereinafter, embodiments of the method for forming a color fluorescent surface according to the present invention will be described with reference to the drawings.

In this example, as shown in FIGS. 1 and 2, a plurality of parallel blades (
Prepare a lid body (12) to which 11) is integrally attached. The blade (11) is a panel with a cylindrical surface of a cathode ray tube (described later) (panel +1 when the cover body (12) is covered with the cathode ray tube).
) are provided in two rows on the inner surface of the lid so as to extend toward the center from opposing inner edges. The blades (11) in both rows are arranged at a predetermined pitch, for example, at an equal pitch, so as to correspond to each other.

(13) is a holding member when the lid (12) is placed on the panel 11), and is provided integrally with the lid (12).

On the other hand, in the panel (1), carbon stripes N (2) which will serve as a light absorption layer are formed in advance on the inner surface of the panel with a predetermined pitch by a normal method in the same manner as described above, and then a photosensitive liquid of, for example, diazonium is applied to the entire surface. and dry. For example, a region of the photosensitive coating film (3) where a blue phosphor layer is to be formed is exposed to light to impart tackiness to the photosensitive coating film (3) in this region.

Next, with the panel (1) tilted slightly opposite to the horizontal (see the position of the chain line in Figure 3), the blue phosphor (4) is injected into one side of the panel (1), and the above-mentioned procedure is performed. The panel (1) is covered with a lid (12). At this time, the blades (11) are arranged within the panel 11) along the extending direction of the carbon stripe layer (2). Further, a predetermined interval d is formed between the vane (11) and the inner surface of the panel to allow a portion of the injected phosphor (4) to flow therethrough. Although this gap d varies slightly depending on the characteristics of the blue, green, and red phosphors, a gap of about 11 to 2 W is provided.

Next, the panel +11 is set at a predetermined angle, for example, 4 in the direction in which the carbon stripe layer (2) is arranged, as shown by the solid line position in FIG.
After stretching by 5° to 50°, the panel +1) is rotated around the rotation axis (5). This panel rotation allows
Although the phosphor (4) flows along the panel skirt through the gap d between the blade (11) and the inner surface of the panel, each blade (
11), and the phosphor (4) accumulates between each blade (11) (see Fig. 1). Then, as shown in Fig. 3, when the angle of the part where the phosphor (4) is stored is tilted to the maximum, the phosphor (4) moves into the carbon stripe M.
Slide down along (2) (in the direction of the arrow). As a result, the blue phosphor (4) also flows to the center of the panel and is uniformly deposited on the exposed blue area of the photosensitive coating on the inner surface of the panel. Panel rotation is, for example, 12-18 rpm + m for 3 minutes (1
processing time).

Switching the direction of rotation between forward and reverse will make it more uniform. After that, it is developed, that is, the phosphor (4
), then blow high-pressure air to remove excess phosphor (
4) is removed to form a phosphor stripe layer (6B).

Thereafter, the steps of exposing the photosensitive coating film (3), attaching the phosphor by rotating the panel, and developing the phosphor are repeated in the same manner to form an edge phosphor stripe layer (6G) and a red phosphor stripe. Form a layer (6R) to obtain the desired color fluorescent surface (6)
get.

Alternatively, the fluorescent material (4) may be first spread over the entire surface of the panel through a sieve, and then the cover body (12) having wings of the present invention may be placed and the panel may be rotated to begin the adhesion process. good.

The gap d (dl) between each blade (11) and the inner surface of the panel.

d2. d3. ) becomes narrower towards the center than the edges (
dl < d2 < dg ) so that the phosphor (4) accumulates evenly between each blade (11).

Historically, when the same phosphor deposition process is performed twice by changing the position of the vane (11), for example, the first phosphor deposition process is performed using the vane (11) in FIG. When the second phosphor attachment is performed using the blade (11) shown in Figure 5 with the blade (11) in a different position, the trace of the blade (11) disappears and the phosphor (
4) Adhesion is more uniform.

Incidentally, the present invention has the advantage that a conventional slurry method apparatus for rotating and revolving the panel (1) can be used.

An example of this is shown in FIG. In the same figure, a panel +1) equipped with a lid (1) having wings is held on a panel mount (4), a revolution axis (16) is rotated by a motor (15), and an autorotation axis is rotated by a motor (17). (5) is rotated.

According to this method of forming a color phosphor surface, when the panel tll is tilted and rotated to disperse and adhere the phosphors (4), the flow of the phosphors (4) is prevented by the blades (11). The controlled distribution of the phosphor (4) over the entire inner surface of the panel allows the phosphor (4) to be evenly deposited on the entire inner surface of the panel. In addition, since the phosphor (4) slides down along the carbon stripe layer (2), adhesion can be improved, and each blue, green, and red phosphor layer is uniformly applied to the area where one layer is to be formed. A phosphor (4) can be deposited. Further, since the adhesion is uniform, color mixing does not occur. In particular, when the color fluorescent surface has a fine pitch, the adhesion width becomes narrower and it is difficult to adhere, and the carbon stripe layer (
2) becomes a wall, making it difficult for the phosphor (4) to enter between the carbon stripe layers (2), but this does not occur in the present invention, and the phosphor (4) can be easily inserted between the carbon stripe layers (2). (4) can be attached. Furthermore, the panel (1
) is covered with a lid body (12), so when rotating the panel and attaching the phosphor, the phosphor (4) may leak out of the panel.
) can be prevented from scattering, and the intrusion of dirt from the outside can also be prevented.

〔Effect of the invention〕

According to the present invention, in a method for forming a color fluorescent surface of a cathode ray tube, in which a phosphor is injected into the inner surface of the panel and the panel itself is rotated to attach the phosphor, there is provided a lid having wings on the inner surface. By disposing the body on the panel, the phosphor can be evenly distributed over the entire inner surface of the panel, and the phosphor can be evenly adhered to the entire panel. In addition, the filling of the phosphor is improved and there is no unevenness, and the phosphor is evenly deposited, resulting in less color mixing. Therefore, the method of the present invention is particularly suitable for forming color fluorescent surfaces with fine pitches.

[Brief explanation of the drawing]

Figures 1 and 2 are a plan view and a sectional view taken along the line A-A of the method of the present invention, Figure 3 is a process diagram for attaching a phosphor, and Figures 4 and 5 are 6 is a cross-sectional view showing an example of a lid body having wings used in the method of the present invention, FIG. 6 is a schematic perspective view when using a device based on the slurry method when carrying out the method of the present invention, and FIG. 7 is a color fluorescent light. A sectional view showing an example of the surface, and FIGS. 8 and 9 are process diagrams for attaching a phosphor in a conventional example and a plan view for explaining the same. 11) is the panel, (2) is the carbon stripe layer, (3
) is a photosensitive coating film, (4) is a phosphor, (6) is a color fluorescent surface, (11) is a blade, and (12) is a lid.

Claims (1)

[Claims] A method for forming a color fluorescent surface, in which a phosphor is injected into the inner surface of a panel, and the panel is rotated to attach the phosphor to a desired portion, wherein a plurality of parallel blades are integrally formed on the inner surface. A lid provided on the panel is disposed on the panel, and when the panel is rotated, the phosphor in the panel is slid down along the extending direction of the blade, and the phosphor is uniformly spread on the inner surface of the panel. A method for forming a colored fluorescent surface, characterized by adhesion.