JPH1097831A - Panel for cathode-ray tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide excellent resolution as well as an excellent anti-reflection property by setting such configuration that the peripheral edge parts of respective SiO2 particles swelled up to have flatness in their central parts and the film thickness at the central parts is made less than 400Å. SOLUTION: After cleaning and drying the external surface of a glass panel 10, the external surface is heated to high temperature from 40 to 50 deg.C. Then, ethanol solution including SiO2 is sprayed on the external surface of the glass panel 10. In this case, the ethanol solution including SiO2 is formed in liquid drops and hit the external surface of the glass panel 10 so that its peripheral parts 14 is swelled up to provide a bowl shape at the central part 15. However, since the external surface of the glass 10 is in a range from 40 to 50 deg.C, instantaneous dry can not be expected but deformation continuing from its peripheral edge part 14 to the central part 15 is generated and after the central part 15 is flattened, dryness and solidification take place. As the result, SiO2 particles 13 appear with the peripheral edge part 14 swelled up and the central part 15 flattened. In this case, the upper limit value of a head between the peripheral edge part 14 and central part 15 of SiO2 particles 13 is to be set at 400Å.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cathode ray tube panel having excellent antireflection properties and resolution.

[0002]

2. Description of the Related Art A cathode ray tube panel has a mirror-finished outer surface in a state where no treatment is applied to the outer surface. In a cathode ray tube using such a panel, light rays from the outside are emitted from the panel. There is a problem that the image reflected on the outer surface becomes difficult to see on the panel.

[0003] To prevent external light reflection, a cathode ray tube has been proposed in which a large number of irregularities are formed on the outer surface of a panel. In such a cathode ray tube, a large number of irregularities formed on the outer surface of the panel scatter external light reflection on the panel surface, so that regular reflection can be reduced and external light reflection can be reduced.

In order to form irregularities on the outer surface of the panel, there is a method of forming irregularities directly on the panel glass by mechanical or chemical means such as honing or frosting to roughen the outer surface. Honing, however, has the drawback that it cannot be regenerated and its quality is not stable because the glass is ground by applying an abrasive to the outer surface of the panel to make the glass uneven. Further, the frosting process involves etching the glass with hydrofluoric acid to make the glass uneven, so that not only is it impossible to regenerate but also there is a problem in terms of handling safety and pollution associated with the use of hydrofluoric acid.

[0005] In order to solve such a problem, a solution containing SiO ₂ particles is sprayed on the outer surface of the panel, so that a large number of irregularities composed of SiO ₂ particles are formed.
A cathode ray tube formed with an iO ₂ coating has been proposed.

[0006]

However, in a conventional cathode ray tube on which a SiO ₂ coating is formed, reflection of external light can be prevented, but image rays for forming an image projected on a panel constitute the SiO ₂ coating. The most important resolution for the cathode ray tube is a significant reduction in resolution due to the diffusion of SiO ₂ particles.

FIGS. 4 and 5 are enlarged sectional views of SiO ₂ particles constituting a conventional SiO ₂ coating. Conventional Si
As shown in FIG. 4, the SiO ₂ particles 20 constituting the O ₂ coating have a peripheral portion 21 protruding, and a central portion 22 has a bowl shape smoothly depressed from the peripheral portion 21. As shown in FIG. 5, a hemisphere bulging from the peripheral portion 21 toward the central portion 22 is formed.
_The SiO ₂ coating composed of the _two particles 20 has many irregularities as a whole. However, FIG.
2, or since the surface of the SiO ₂ particles 20 in FIG. 5 has a spherical surface, the image light rays transmitted from the phosphor on the inner surface of the panel are diffused by the lens effect on the spherical surface of the SiO ₂ particles 20, and as a result, As a result, the resolution of the cathode ray tube decreases. Therefore, in the conventional cathode ray tube in which the SiO ₂ coating is formed on the outer surface of the panel, there is a problem that the resolution is remarkably reduced in order to obtain excellent antireflection property.

Further, the SiO ₂ particles 20 constituting the conventional SiO ₂ film, SiO ₂ that poor resolution from the thickness of the central portion 22 of the particle 20 is thick, plus the periphery 21 of the SiO ₂ particles 20 Because of the large difference in film thickness between the substrate and the central portion 22, for example, an antireflection film is formed on the outer surface of the panel by spin coating or the like, and the SiO ₂ particles 2
When a SiO ₂ film having a large number of irregularities made of 0 is formed, there is also a problem that reflection due to the interference effect of light is increased.

Accordingly, an object of the present invention is to provide a panel for a cathode ray tube in which an SiO ₂ film having irregularities is formed on the outer surface of the panel to obtain excellent antireflection properties and resolution.

[0010]

The present invention SUMMARY OF] has been made in view of the above problems and objects, SiO ₂ for spraying a solution containing SiO ₂ on the outer surface presents a large number of irregularities consisting minute SiO ₂ particles In the cathode ray tube panel on which the coating is formed, the peripheral portion of each SiO ₂ particle is raised and the central portion is flat, and the central portion has a thickness of 400 °.
A cathode ray tube panel characterized by the following.

[0011] Further, the present invention is a panel for a cathode ray tube, characterized in that a drop between a peripheral portion and a central portion of the SiO ₂ particles is 200 to 400 °.

The SiO ₂ film having a large number of irregularities formed in the present invention is not limited to the case where it is directly formed on the outer surface of the panel. For example, a conductive film formed on the outer surface of the panel or an anti-reflection film This includes the case where it is formed as an outermost layer film on another film such as a film.

[0013]

According to the present invention, since the central portion of each of the SiO ₂ particles constituting the SiO ₂ coating is flat, the image light passing through the central portion is diffused by the lens effect of the SiO ₂ particles. Since the light is transmitted to the outside of the panel without being processed, excellent resolution can be obtained. The reason why the thickness of the central portion is set to 400 ° or less is, in particular, on the antireflection film formed by spin coating on the outer surface of the panel,
In the case of forming the SiO ₂ film by SiO ₂ particles is because the thickness of the central portion of the SiO ₂ particles is significantly larger 400Å greater than the surface reflection.

Further, by setting the head of each SiO ₂ particle between the peripheral part and the central part at 200 to 400 °,
By reducing the difference in film thickness between the peripheral portion and the central portion of the O ₂ particles, reflected light can be reduced. The head is 200
If it is smaller than Å, an antiglare effect cannot be obtained, and if it is larger than 400 Å, a light interference effect cannot be obtained and the surface reflection will be large.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a cathode ray tube panel of the present invention and a method of manufacturing the same will be described based on embodiments.

FIG. 1 is a longitudinal sectional view of a panel for a cathode ray tube according to the present invention.

The outer surface of the panel glass 10 is made of SiO _{2 having} many irregularities 11 made of minute SiO ₂ particles.
_Two coatings 12 are formed.

FIG. 2 is an enlarged sectional view of the SiO ₂ particles constituting the SiO ₂ coating 12.

The peripheral part 14 of each SiO ₂ particle 13 is raised and the central part 15 is flat. In addition, SiO ₂
The thickness of the central portion 15 of the particle 13 is 400 ° or less. The drop between the peripheral portion 14 and the central portion 15 in each SiO ₂ particle 13 is 200 to 400 °. A peripheral edge portion 14 when the fall is too large between the central portion 15 results in the center 15 of the SiO ₂ particles 13 are less likely to flatten the situation of SiO ₂ particles 13, is one of the objects of the present invention In order to improve the resolution, it is considered that the upper limit of the drop between the peripheral portion 14 and the central portion 15 of the SiO ₂ particles 13 is 400 °.

An SiO ₂ coating 1 on the panel glass 10
2 was formed by the following method.

First, the outer surface of the panel glass 10 is cleaned,
After drying, the outer surface was heated to 40 to 50 ° C and heated.

Then, a SiO ₂ solid content of 1.5 to 2.0%
The ethanol solution containing SiO ₂ by spray coating, and was blown to the outer surface of the panel glass 10 at a spray pressure of 2.7 kg / cm ^3. At this time, the panel glass 10
The ethanol solution containing SiO ₂ sprayed on the outer surface of the panel glass becomes droplets and hits the outer surface of the panel glass 10 so that the peripheral portion 14 is raised and the center portion 15 has a bowl shape. 40-50 outer surface
Due to the temperature of ° C., it does not dry instantaneously, but deforms from the peripheral portion 14 to the central portion 15 to flatten the central portion 15 and then dry and solidify. As a result, the SiO ₂ particles 13 in which the peripheral portion 14 is raised and the central portion has a flat shape are obtained.

Thereafter, the panel glass 10 is heated at 450 ° C.
By baking for 30 minutes, a SiO ₂ coating film 12 having irregularities 11 composed of the above-mentioned fine SiO ₂ particles 13 was formed.

In this embodiment, an ethanol solution is used as a solvent for SiO _2. However, the present invention is not limited to this, and SiO ₂ (OR) ₄ using another solution as a solvent is also possible.

The transparent coating 12 is formed on the panel glass 1.
0 may be formed on another film formed on the outer surface.

(Comparative Example) A panel glass 10 as shown in FIG. 1 was prepared, and on its outer surface, an SiO ₂ coating having a large number of irregularities composed of fine SiO ₂ particles was formed.

Each Si constituting the SiO ₂ coating
The peripheral portion of the O ₂ particle is raised, and the central portion has a bowl shape smoothly depressed from the peripheral portion. In addition, each Si
The central portion of the O ₂ particles has a thickness of 500 ° or more,
The difference between the periphery and the center is 500-1000 °.

The formation of the SiO ₂ coating on the panel glass 10 was performed by the following method.

First, the outer surface of the panel glass 10 is cleaned,
After drying, the outer surface was heated to a temperature of 55 to 65 ° C., and thereafter, the SiO ₂ coating having irregularities composed of the fine SiO ₂ particles was formed in the same manner as in the example.

A measurement test was conducted on the antireflection properties and the resolution of each of the cathode ray tube panels thus produced.

Regarding the antireflection property, both the examples and comparative examples had excellent antireflection properties with a gloss value of 65%.

Regarding the resolution, each panel glass was sample-cut to a predetermined size, and a photodetector was installed on the side of the glass sample that was installed vertically on the SiO ₂ film forming side, and a light source was installed on the other side. With the front position set to 0 °, the light receiver was moved at an angle, and the angle was measured by a variable angle transmission test for measuring the transmitted light intensity at each angle.

FIG. 3 shows the results of measuring the transmitted light intensity of the variable angle of each panel for a cathode ray tube. As is clear from FIG.
The curve of the panel for a cathode ray tube of the example was a curve in which the skirt spread was smaller than that of the panel of the comparative example. That is, the panel for a cathode ray tube of the example had a higher transmitted light intensity at a variable angle of 0 ° than the comparative example, a large decrease rate of the transmitted light intensity due to the variable angle, and had excellent resolution.

[0034]

As described above, according to the present invention, it is possible to obtain a panel for a cathode ray tube having excellent antireflection properties and excellent resolution.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a cathode ray tube panel according to an embodiment of the present invention.

FIG. 2 shows an example of Si constituting an SiO ₂ coating according to an embodiment of the present invention.
It is an enlarged sectional view of the O ₂ particles.

FIG. 3 is a graph showing the angle-changed transmitted light intensities of the cathode ray tube panel of the present invention and a cathode ray tube panel of a comparative example.

FIG. 4 is an enlarged sectional view of SiO ₂ particles constituting a conventional SiO ₂ coating.

FIG. 5 is an enlarged sectional view of SiO ₂ particles constituting a conventional SiO ₂ coating.

[Description of Signs] 10 Panel glass 11 Irregularities 12 SiO ₂ coating 13, 20 SiO ₂ particles 14, 21 Peripheral portion 15, 22 Central portion

Claims (2)

[Claims] To 1. A outer surface spraying a solution containing SiO _2, exhibits a number of irregularities consisting minute SiO ₂ particles S
In the cathode ray tube panel on which the iO ₂ film is formed, the peripheral portion of each SiO ₂ particle is protruded to have a flat central portion, and the film thickness of the central portion is 400 ° or less. Panel for pipe. 2. The panel for a cathode ray tube according to claim 1, wherein a drop between the peripheral portion and the central portion of the SiO ₂ particles is 200 to 400 °.