JPS61253739A - Formation of carbon layer - Google Patents

Abstract

PURPOSE:To enable to attach and form an even carbon layer, by attaching a mixture of hydrophilic-processed carbon powder and specific particles with diameter finer than that of the carbon powder, to portions which exercise adhesive performance. CONSTITUTION:A mixture of a carbon powder and a specific particles is made by adding 5-200pts.wt. of particles of aluminum oxide, silicone oxide or the like with particle diameter about 20mmu-100mmu, to 100pts.wt. of a carbon powder with the mean diameter about 1mum, which has been given hydrophilic property by adding a surface active agent. After unexposed portions of a panel 2, on which phosphor layers R, G, and B are formed in a stripe form, are exposed to give adhesion to the sensitive adhesive 4 at the concave portions of the panel 2, the mixture is sprinkled over the panel 2. In this case, the mixture exercises a highly fluid and dispersive performance over the panel 2, and flows evenly and sufficiently onto the concave portions without giving a strong oscillation. Thus, an even carbon layer 7 can be attached and formed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for uniformly depositing a carbon layer on a substrate.

The fluorescent surface for reverse summer limb blood color cathode ray tubes is the glass plate (hereinafter referred to as substrate (2)) on the face of the glass bulb (1) as shown in Figure 2.
), as shown in Figure 3, phosphor layers (R), (G), and (B) emitting the three primary colors of red, green, and blue are formed in a stripe shape, and further phosphor layers of each color (R ) (G) Form a black carbon layer (3) so as to fill the space between (B),
Color mixing between adjacent phosphor layers (R), (G), and (B) is prevented.

Conventionally, this phosphor layer (R) (G) (B) and carbon layer (
3) was formed as follows.

First, as shown in FIG. 4, a photosensitive adhesive layer (4) made of diazonium metal salt or the like is deposited on a substrate (2). This is done by supplying a photosensitive adhesive to the center of the inner surface of the face of a glass bulb (1), rotating the bulb (1) using an appropriate means to spread it uniformly around the circumference, and then heating it. This is done by drying. Next, as shown in FIG. 5, the portions (4R) where a phosphor layer (R) of one color (for example, red) is to be deposited are selectively exposed.
Adhesiveness is developed only in that area. This adhesiveness occurs when the diazo component in the diazonium metal salt is decomposed by light and zinc chloride is precipitated, which becomes hygroscopic and absorbs moisture from the air.

Next, red-emitting phosphor powder is sprinkled onto the substrate to adhere to the adhesive portion, and the remaining phosphor is removed by air blowing. As a result, as shown in FIG. 6, the phosphor material N (R) (R), .

Further, as shown in FIG. 7, the phosphor %f(R)(R)
. . . , a green-emitting phosphor layer (G) and a blue-emitting phosphor layer (B) are deposited in a stripe shape by the above-mentioned process such as selective exposure.

Thereafter, a carbon layer (3) is formed between each of the phosphor layers (R), (G), and (B) as shown in FIG.

This process involves exposing the entire surface of the substrate (1) to light, and then exposing the unexposed parts of the photosensitive adhesive Jim (4) between the phosphor layers (R), (G), and (B) to develop adhesiveness. This is done by sprinkling carbon powder over the entire surface, allowing it to adhere to the area, and then blowing away the carbon powder.

(°. In the process of forming the carbon layer (3) described above, the substrate (2)
The carbon powder sprinkled on the substrate (2) has high cohesion and tends to form lumps, making it difficult to spread over the surface of the substrate (2), making it difficult to form a homogeneous carbon layer. In addition to the fluorescent part, the phosphor particles (5) (5) of the previously formed phosphor layer (R) (G>CB)...
There was a problem that carbon particles (6) (6), etc. easily entered between the spaces between the two, and once they entered, it was difficult to remove them, inhibiting the color development of the phosphor.

Fluorescent particles (5) (5) are the cause of such problems.
... have a particle size of about 3 to 10 μm, whereas carbon particles (6) (6)... have a small diameter of about 1 μm, and phosphor particles (5) (5)... It is easy for carbon particles (6) to enter the gaps between... and the already formed phosphor layer (R) (C;) (B) has a stepped shape, which prevents the carbon particles from entering. (6) (6)・-・
This may be due to the fact that it is difficult for the liquid to flow over the substrate (2).

In particular, carbon particles (6) (6)... phosphor particles (5
) (5)... The carbon particles (6) (6)..., which are difficult to spread on the substrate (2), are allowed to enter the gaps between the phosphor layers (R), (G), and (B). This is more likely to occur if strong vibrations are applied to try to get it into the area.

Therefore, the present invention improves the carbon powder used,
The purpose is to provide properties that will prevent the above problems from occurring.

. In the present invention, a photosensitive adhesive layer formed on a substrate is selectively exposed to light to develop adhesiveness, and when a carbon layer is deposited on this portion, the carbon layer is The mixture to be sprinkled onto the substrate for formation is a mixture of hydrophilically treated carbon particles with particles having a finer particle size than the carbon particles.

The above-mentioned mixture of the present invention is a mixture of fine particles with a large intermolecular attraction force, so the adhesion of carbon particles to each other is high (and it is difficult for the carbon particles to get into the particles of the phosphor). Since it has hydrophilic properties, the mixture has fluidity and dispersibility, making it easier to flow on the substrate. 1. It becomes easier to adhere to sticky parts.

Imperial throne week An embodiment of the present invention will be described below.

A surfactant is added to carbon powder with an average particle size of about 1μ to give it hydrophilicity, and this carbon powder 100 (weight-1jt
), and prepare a mixture to which 5 to 200 parts (weight M) of fine particles of aluminum oxide or silicon oxide having a particle size of about 2μ to 1ooII+μ are added.

Then, in the above-mentioned process, the substrate (2
) is exposed to light to impart tackiness to the photosensitive adhesive (4) in the valley areas, and then the above mixture is sprinkled onto the substrate (2). At this time, the above mixture is the substrate (2)
It has high fluidity and dispersibility on the surface and flows uniformly into the valleys without applying strong vibrations. As shown in FIG.
(B) Fluorescent particles (5) (5)... They do not get in between.

The above-mentioned mixture of the present invention has high fluidity and dispersibility even if the particles are smaller than the phosphor particles, and is difficult to adhere to the phosphor particles. Since the fluorescent material IN(R)(G)(
Even if B) is formed, the phosphor layer (R) (G) (B)
A homogeneous carbon layer can be easily formed on the adhesive layer in the valleys of the adhesive layer.

Note that the present invention provides a single fluorescent layer (R) (G) (B) on a substrate.
It can be applied even when carbon is not formed, and a uniform carbon layer can be formed due to the characteristics of the above-mentioned mixture having high fluidity and dispersibility.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a substrate on which a carbon layer is formed by the method of the present invention. FIG. 2 is a cross-sectional view of a glass bulb, which is one of the objects of the present invention, and FIG. 3 is a phosphor layer (R) (G
) (B) and a plan view of a substrate on which a carbon layer is deposited. 4 to 8 show phosphor layers (R) (G) on the substrate, respectively.
)(B) and sectional views of the substrate sequentially showing the steps of depositing and forming a carbon layer. FIG. 9 is an enlarged sectional view of a substrate showing problems when a carbon layer is formed by a conventional method. (2) One substrate, (4) - photosensitive adhesive layer, (7) -.
- Carbon layer.

Claims (1)

[Claims] (1) The photosensitive adhesive layer formed on the substrate is selectively exposed to light to develop tackiness, and the part that has developed tackiness is coated with hydrophilic-treated carbon particles compared to the particle size of the carbon particles. A method for forming a carbon layer, which comprises depositing a mixture of fine particles.