JPS63193436A - Manufacture of dazzling-proof cathode-ray tube - Google Patents

Abstract

PURPOSE:To make a degree of interference light to the minimum by spraying coating liquid of silica coat on the face surface of a cathode-ray tube with a spray having specific air pressure for forming unevenness with film thickness less than 1mum on the face surface. CONSTITUTION:Coating liquid of silica coat at a temperature 10-30 deg.C is sprayed on the face surface 2 of a cathode-ray tube with a spray 1 with air pressure 2.5-3.5kg/cm<2> to form an uneven film 4 having film thickness less than 1mum on the face surface 2. That is, when the temperature of the coating liquid is 10-30 deg.C and the air pressure is 2.5-3.5kg/cm<2>, an amount of liquid to be used remains at the minimum, the liquid becomes scattering particles 3a having an appropriate diameter to form the stable uneven film having film thickness less than 1mum. Thereby, picture display of good quality can be obtained while making a degree of interference light to the minimum.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for manufacturing an anti-glare cathode ray tube in which thin silica coated irregularities IN are formed on the face of the cathode ray tube to diffusely reflect external light.

[Conventional technology]

As a means to reduce the reflectance of external light, for example, as used in eyeglasses, the glass surface of the glasses (and the glass) are coated with a smooth external light antireflection film that has a different refractive index than the glass. There is.

However, there is no discussion in the literature regarding a method for minimizing reflectance after diffusely reflecting external light.

[Problem that the invention seeks to solve]

Conventional silica coating technology does not take into account the special interference light caused by the film shape, and in the case of cathode ray tubes, the interference light makes the image display difficult to see and can easily cause eye strain. There was a problem.
' An object of the present invention is to provide a method for manufacturing an anti-glare cathode ray tube that can minimize the degree of interference light generated during thin film coating.

[Means for solving problems]

The above purpose was to spray a silica coat coating solution at a temperature of 10 to 30°C onto the face of a cathode ray tube using a sufu' v -s with an air pressure of 2.5 to 3.5 Jcg/d, and coat the face with a film thickness of 1 μm. This is achieved by forming the following uneven film.

[Effect]

If the temperature of the silica coating solution is 10 to 30℃ and the spray air pressure is 2.5 to 3.5 kg, the amount of solution used will be minimized, and the film thickness will be 1 μm.
Since the following stable concave-6 film can be formed, it is possible to display high-quality images (also, the degree of interference light can be minimized).

〔Example〕

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

As shown in FIG. 1, scattered particles 3a of the silica coat coating liquid are emitted from the spray 1.

3b and 3c are attached to the face 21 of the cathode ray tube,
It is coated as an uneven film 4. Here, the three types of scattered particles 3a, 3b, and 3c have ring diameters and film thicknesses of particle shapes 4a, 4b, and 4c as shown in FIGS. 2 and 3, respectively, after adhering to the face surface. Size indicates particle size.

This will be explained in more detail. The viscosity of the coating liquid varies greatly depending on the temperature. As a result, the divergence angle of the coating liquid from the spray v-1 and the diameter of the scattered particles change. The divergence angle of this liquid and the diameter of the scattered particles also change depending on the air pressure of the spray 1.

As a result of experiments, when the temperature of the coating liquid is 10 to 30°C or the air pressure is 2.5 to 3.5 kg/cd, the amount of liquid used can be minimized, and as shown in Figure 1E, The scattered particles 3a have an appropriate diameter. This scattered particle 3a is
Stable particle shape 4a with a ring diameter of about 30 μm as shown in FIG. 2 and a film thickness of 1 μm or less as shown in FIG.
becomes.

If the temperature of the liquid exceeds 30° C., the viscosity decreases, the scattering angle increases, the efficiency of coating onto the face surface 2 deteriorates, and the amount of liquid used must be increased.

Further, as shown in FIG. 1, the scattered particles 3b have a small diameter. The scattered particles 3b have a ring diameter of about 25 ttm or less as shown in FIG. 2, and have a particle shape 4b in which each particle is thin as shown in FIG. 3. In other words, since the particle shape 4b has a thin particle thickness, in order to reduce the gloss to the desired level, it is necessary to use a large amount of liquid and apply multiple coats, resulting in a decrease in film thickness. It gets thicker. This phenomenon appears even when the air pressure is increased to exceed 3.5 kg/(-d).

If the temperature of the liquid is lower than 10℃, the viscosity will increase, so
When the divergence angle becomes small and the face surface 2 is coated, the coating becomes uneven and the gloss difference across the entire face surface 2 becomes large, resulting in a defect.

Moreover, as shown in FIG. 1, the scattered particles 3C have a large diameter. These scattered particles 3C have a ring diameter of about 35 μm or more as shown in FIG. 2, a large ring diameter as shown in FIG. The particle shape becomes 4C. In this way, particle shape 4
With C, the gaps between the protrusions become wider and the gloss cannot be lowered, so in this case as well, the amount used must be increased to fill in the gaps, and the film thickness is also large. Film thickness is 1μm
If the value exceeds 0.25, strong interference light will be emitted, making the image display difficult to see and causing eye strain. This phenomenon appears even when the air pressure is lower than 2.5 kg/cr1.

Figures 4 and 5 show the liquid temperature or air pressure and the amount of liquid used,
It is an experimental diagram showing the relationship between the ring diameter and the intensity of interference light.

As is clear from the figure, the liquid temperature is 20℃ and the air pressure is 3℃.
．． The best results are obtained when the temperature is 0 ky/d, but as mentioned above, the liquid temperature is 10-30°C and the air pressure is 2.5-3.
It was found that there is no practical problem even in the range of 5 kfi/crd.

〔Effect of the invention〕

According to the present invention, a high-quality anti-glare cathode ray tube can be manufactured by efficiently reflecting external light diffusely and minimizing interference light with a minimum amount of coating liquid used.

[Brief explanation of the drawing]

Figure 1 is a schematic diagram of coating on a cathode ray tube, Figure 2 is a conceptual diagram of the shape of particles attached to the panel surface, Figure 3 is a cross-sectional view of Figure 2, and Figure 4 shows characteristics depending on liquid temperature. Characteristic diagram of experimental results, WJ5 diagram is a characteristic diagram of experimental results showing characteristics depending on air pressure. 1...Splash v+, 2...Face surface,
3a, 3b, 3C...Scattered particles, 4...Uneven film, 4a, 4b, 4c...Particle shape. Agent: Patent Attorney Katsoo OgawaFigure 1Figure 2Figure 3

Claims (1)

[Claims] 1. Spray the silica coating liquid at a temperature of 10 to 30°C onto the face of the cathode ray tube with an air pressure of 2.5 to 3.5 kg/cm^2 to form an uneven film with a thickness of 1 μm or less on the face. A method for manufacturing an anti-glare cathode ray tube, characterized by forming