JPH05190092A - Photosensitive material exposing method for external exposure - Google Patents

Abstract

PURPOSE:To form good polyvinyl alcohol on the inside face of a panel constituting a cathode ray tube. CONSTITUTION:As one of steps to form a fluorescent substance on the inside face of a panel 1 constituting a cathode ray tube by external exposure, preset areas 5, 6 of polyvinyl alcohol 3 applied on the inside face of the panel 1 are exposed. At this time, the amount of exposure is distributed to perform three or more point exposure for the areas 5, 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is a step of forming a phosphor on the inner surface of a panel constituting a cathode ray tube by an outer surface exposure method, and forms a photosensitive material having a good development pattern on the inner surface of the panel. The present invention relates to a method of exposing a photosensitive material.

[0002]

2. Description of the Related Art FIGS. 4 and 5 are process diagrams for forming a phosphor on an inner surface of a panel by an external exposure method according to a conventional method. First, as shown in FIG. A mask 2 of carbon or the like is formed in a stripe shape on the side surface, and then polyvinyl alcohol (PVA), which is one of the photosensitive materials, is applied to the inner surface of the panel 1 as shown in FIG. As shown in (a), the shadow mask 4 is installed so as to face the inner surface of the panel 1, and only the central portion R1 of the red phosphor forming region 5 is exposed by a light source LR such as a laser.
Alternatively, the central portion R1 and the end point (mask end portion) M1 of the mask 2 are exposed with the same exposure amount. Similarly, the green phosphor forming region 6 is exposed from the light source LG only at the central portion G1 or at the central portion G1 and the end point M2 of the mask 2 by the same exposure amount.

[0003]

However, in the above method, when the polyvinyl alcohol 3 is developed, as shown in FIG.
As shown in FIG. 2, the cross-sectional shape of the polyvinyl alcohol 3 is such that the edge B of the mask 2 widens due to overexposure, and the edges A of the red phosphor forming region 5 and the green phosphor forming region 6 fall due to insufficient exposure. May occur. For this reason, after applying the blue phosphor, after exposing the outer surface of the panel 1 to the outer surface, and then performing reversal and development with a hydrogen peroxide solution, the film thickness of the polyvinyl alcohol 3 required for reversal cannot be obtained, and thus the blue color cannot be obtained. The phosphor is exposed to light and remains in the red phosphor forming region 5 and the green phosphor forming region 6, or unevenness occurs on the surface of the blue phosphor in the blue phosphor forming region 7.

Therefore, when the exposure amount is increased to obtain the film thickness necessary for reversing polyvinyl alcohol, for example, polyvinyl alcohol may remain in the area where it should not remain.

Therefore, an object of the present invention is to provide a method for exposing a photosensitive material used in an outer surface exposure method for forming a polyvinyl alcohol having a film thickness necessary for reversal without leaving the polyvinyl alcohol in an extra area. To do.

[0006]

According to the present invention, the above-mentioned problem is one step of forming a phosphor on the inner surface of a panel constituting a cathode ray tube by an outer surface exposure method, which is applied to the inner surface of the panel. In the method of exposing a predetermined area of the photosensitive material, the exposure amount is distributed to the predetermined area.
This is solved by an exposure method of a photosensitive material used in an outer surface exposure method, which is characterized by exposing at least one portion.

[0007]

According to the present invention, as shown in FIG. 1, with respect to a predetermined area 5 (and 6), at least three points are provided at the center R1 (and G1) and the two ends R2 and R3 (and G2). , G3), the exposure amount is appropriately distributed to the light source L
When the polyvinyl alcohol 3 of the photosensitive material is developed after exposure from R (and LG), the end points R2 and R3
By exposing (and G2, G3), polyvinyl alcohol 3 in part A shown in FIG.
Is eliminated, and by appropriately distributing the exposure amount, the polyvinyl alcohol 3 is prevented from spreading in the portion B shown in FIG. 5B, and the polyvinyl alcohol having a good film thickness is provided in the predetermined region 5 (and 6). Alcohol 3 can be formed.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment according to the present invention will be described with reference to FIG.

1 to 3 are cross-sectional views of a panel in a process of forming a blue phosphor by an external exposure method.

First, as shown in FIG. 4A of the conventional example,
60 to 100 μm in width and 2 in thickness on the inner surface of the panel 1.
A plurality of stripe-shaped masks 2 having a pitch interval of ˜4 μm and 60 to 100 μm are formed, and then, as shown in FIG. 4B, polyvinyl alcohol 3 is applied on the inner surface of the panel 1 to a thickness of 3 to 5 μm.

Next, as shown in FIG. 1, a shadow mask 4 is installed so as to face the inner surface of the panel 1, and the central portion R1 and both end portions R2 of the red phosphor forming region 5 are formed according to the present invention.
Exposure is sequentially performed by the light source LR at a ratio of 1.8: 1: 1 as the light source amount with respect to R3. Similarly, for the green phosphor forming region 6, the central portion G1 and both end portions G2, G
With respect to No. 3, the light source amount is 1.8: 1: 1, and the light source LG is used for exposure.

Next, when the polyvinyl alcohol 3 is developed, as shown in FIG. 2A, the cross-sectional shape of the polyvinyl alcohol 3 becomes substantially flat in the red phosphor forming region 5 and the green phosphor forming region 6. As a result, the film thickness necessary for reversing the polyvinyl alcohol 3 can be ensured, and the bottom of the polyvinyl alcohol 3 does not spread even in the mask portion 2. In the figure, MS indicates the end of the mask.

Next, according to the conventional outer surface exposure process, as shown in FIG.
(B), the after applying the blue phosphor 8 on the inner surface of the panel 1, a hydrogen peroxide solution after performing exposure from the outer surface of the panel 1 as shown in FIG. 3 (a) (H ₂ O ₂ ) When polyvinyl alcohol 3 is dissolved and developed with a solution,
As shown in FIG. 3B, a good blue phosphor 8 is formed.

In this embodiment, the number of phosphors formed is 3
Although point exposure was performed, it is of course possible to set four or more exposure points and appropriately distribute the amount of exposure to each point for exposure.

[0015]

As described above, in the step of forming the phosphor on the inner surface of the panel by the outer surface exposure method, according to the present invention, polyvinyl alcohol having a good development pattern can be formed on the inner surface of the panel. To be able to
The polyvinyl alcohol having the pattern was used as a good mask in the phosphor formation in the external exposure method, and the yield was improved in mass production.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention, and is a first half process diagram of forming a phosphor on an inner surface of a panel by an outer surface exposure method.

FIG. 2 shows an embodiment of the present invention and is a half-process diagram of forming a phosphor on the inner surface of a panel by an outer surface exposure method.

FIG. 3 shows an embodiment of the present invention and is a second half process diagram of forming a phosphor on the inner surface of a panel by an outer surface exposure method.

FIG. 4 is a first half process diagram of forming a phosphor on an inner surface of a panel by an external exposure method according to a conventional method.

FIG. 5 is a second half process diagram of forming a phosphor on an inner surface of a panel by an external exposure method according to a conventional method.

[Explanation of symbols]

 1 panel 2 mask 3 polyvinyl alcohol 4 shadow mask 5 red phosphor forming region 6 green phosphor forming region 7 blue phosphor forming region 8 blue phosphor R1 red phosphor forming region center R2, R3 red phosphor forming region end G1 Green phosphor forming area central portion G2, G3 Green phosphor forming area end portion LR Red phosphor forming area exposure light source LG Green phosphor forming area exposure light source MS, M1 Mask end portion A Polyvinyl alcohol drop portion B Polyvinyl alcohol mask spread Department

[Procedure amendment]

[Submission date] January 22, 1993

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 3

[Correction method] Change

[Correction content]

[Figure 3]

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Etsuji Yamaguchi 30 Inabajima, Oya-cho, Inazawa-shi, Aichi Sony Inazawa Corporation

Claims (1)

[Claims] 1. A method of exposing a predetermined region of a photosensitive material applied to the inner surface of a panel, which is a step of forming a phosphor on the inner surface of a panel constituting a cathode ray tube by an outer surface exposure method. An exposure method for a photosensitive material used in an outer surface exposure method, wherein an exposure amount is distributed to the predetermined region to perform exposure at three or more locations.