JPH11306977A - Phosphor face forming method for color cathode-ray tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent generation of at least a defective phosphor face due to fluctuation in a dried slurry layer due to heat by selectively cooling a panel supporting base used for installation of a panel to which photosensitive phosphor slurry is applied. SOLUTION: Before application of a photosensitive agent, black paint, and photosensitive phosphor slurry, it is detected whether a panel is arranged on a panel support base or not by means of a sensor. If no panel is installed, cold water is poured onto the panel support base so as to cool down it selectively. In this way, the temperature of the panel support base is set to approximately the temperature equal to the panel support base with a panel installed. As a result, a photosensitive film and a photosensitive slurry layer are prevented from being, heated, and abnormal drying of a black paint layer is prevented. Consequently, generation of an abnormal shape/dimension of a light absorbing layer and the phosphor layer or generation of a defective phosphor layer due to color mixture of the phosphor layer or a residue of the black paint can be prevented, and a phosphor face can be stably formed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for forming a fluorescent screen of a color cathode ray tube.

[0002]

2. Description of the Related Art Generally, a color cathode ray tube is provided with an electron gun 3 disposed in a neck 2 of a funnel 1 as shown in FIG.
The three electron beams 4B, 4G, 4R emitted from the light source are deflected by a deflecting device 5 mounted outside the funnel 1 to horizontally and vertically scan a fluorescent screen 8 formed on the inner surface of a panel 7 via a shadow mask 6. As a result, a structure for displaying a color image is formed.

As the fluorescent screen 7, as shown in FIG.
Striped three-color phosphor layer 1 that emits blue, green, and red light so as to be embedded in gaps between striped black light absorbing layers 9.
5B, 10G and 10R, and blue as shown in FIG. 5 so as to be embedded in the circular gap of the matrix-shaped black light absorbing layer 9.
A three-color phosphor layer 10B in the form of a circular dot emitting green and red light,
A black matrix type phosphor screen provided with 10G and 10R has been put to practical use.

[0004] These phosphor screens are used for mass production by using a large-scale phosphor screen forming apparatus for intermittently moving a plurality of panel supports and an exposing apparatus separately installed from the phosphor screen forming apparatus. It is formed by forming a light absorbing layer and then forming a phosphor layer by a photo printing method using a mask as an optical mask.

The main steps of this phosphor screen forming method include mounting a panel on a panel support of a phosphor screen forming apparatus, applying a photosensitive agent sequentially with intermittent movement of the panel support, heating and drying, and exposing to light. It is transferred to the apparatus, exposed, and attached again to the panel support of the phosphor screen forming apparatus, with the intermittent movement of the panel support, sequentially developed, heated and dried, coated with black paint, heated and dried, A step of forming a light absorbing layer by peeling off the black paint layer, and applying a photosensitive phosphor slurry,
After being heated and dried, it is transferred to an exposure device for exposure, and is again mounted on the panel support of the phosphor screen forming device. With the intermittent movement of the panel support, it is sequentially developed, heated and dried, and the phosphor layer is dried. Forming a step. The phosphor layer forming step is repeated three times for the three-color phosphor.

[0006]

As described above, the phosphor screen of the color cathode ray tube is provided separately from the phosphor screen forming apparatus for intermittently moving a plurality of panel supports and the phosphor screen forming apparatus. Using a light exposure device, a shadow mask is formed by a photographic printing method using an optical mask, and a black stripe type and a black matrix type fluorescent surface are formed by forming a light absorbing layer and then forming a phosphor layer. Is formed.

[0007] The main steps are coating of a photosensitive agent in a phosphor screen forming apparatus, heating and drying, exposure in an exposure apparatus, development in a phosphor screen forming apparatus, heating and drying, application of a black paint, heating and drying, and a black paint layer. Stripping, application of a photosensitive phosphor slurry, drying by heating, exposure by an exposure device, development by a phosphor screen forming device, and drying by heating. The steps after application of the body slurry are repeated three times.

However, when the phosphor screen is formed in such a process, a space may not be formed on the panel support of the phosphor screen forming apparatus, for example, at the beginning of the formation of the phosphor screen or for the sake of production. When such an empty space is generated, the panel support is directly heated by a heat source for heating and drying, and the temperature becomes higher than that of the panel support on which the panel is mounted. Therefore, when the panel is mounted on the panel support that has been heated to a high temperature, the radiant heat from the panel support will heat and dry the photosensitive agent or photosensitive phosphor slurry applied to the inner surface of the panel. In addition, there is a problem that the black paint is abnormally dried and the formed light absorbing layer and the phosphor layer are abnormal in shape and size, the color of the phosphor layer is mixed, and the black paint residue causes a defective phosphor screen. .

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a method of forming a phosphor screen which prevents at least the occurrence of a defective phosphor screen due to fluctuations in heating and drying of a photosensitive phosphor slurry layer. Aim.

[0010]

Means for Solving the Problems At least a photosensitive phosphor slurry is applied to the inner surface of a panel attached to a panel support by a phosphor screen forming apparatus for intermittently moving a plurality of panel supports, and is heated and dried. After forming the photosensitive phosphor slurry layer, a pattern corresponding to the opening of the shadow mask was baked on the photosensitive phosphor slurry layer by an exposing device separately provided from the phosphor screen forming device, and then the pattern was baked. In the method for forming a fluorescent screen of a color cathode ray tube, in which a panel is mounted on a panel support of a phosphor screen forming apparatus and developed to form a phosphor layer, a panel support on which a panel for applying a photosensitive phosphor slurry is mounted is selected. It was made to cool.

Also, a photosensitive agent is applied to the inner surface of the panel attached to the panel support by a phosphor screen forming apparatus for intermittently moving the plurality of panel supports, and then heated and dried to form a photosensitive film. A pattern corresponding to the opening of the shadow mask is printed on the photosensitive film by an exposure device separately installed from the surface forming apparatus, and the panel with the printed pattern is mounted on a panel support of the fluorescent screen forming apparatus and developed. Heat and dry to form a resist consisting of a pattern corresponding to the opening of the shadow mask, then apply black paint on the inner surface of the resist-formed panel, heat and dry to form a black paint layer, and further with the resist The black paint layer applied on the resist is peeled off to form a light absorbing layer, and a photosensitive phosphor layer is formed on the inner surface of the panel on which the light absorbing layer is formed. After coating and heating and drying to form the photosensitive phosphor slurry layer, the pattern corresponding to the opening of the shadow mask is printed on the photosensitive phosphor slurry layer by the exposure device installed separately from the phosphor screen forming device. Then, the panel baked with this pattern is mounted on a panel support of a phosphor screen forming apparatus, developed, heated and dried to form a phosphor layer. The panel support on which the panel for applying the photosensitive phosphor slurry is mounted is selectively cooled.

Further, in the above-described method for forming a fluorescent screen of a color cathode ray tube, the presence or absence of a panel on the panel support is detected, and only the panel support on which no panel is mounted is cooled.

In the above-described method for forming a fluorescent screen of a color cathode ray tube, the temperature of the panel support is detected, and only the panel support heated to a predetermined temperature or higher is cooled.

[0014]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a process for forming a black stripe type and a black matrix type phosphor screen, which is one embodiment of the present invention.
FIG. 2 shows the main steps.

The black stripe type and black matrix type phosphor screens are large-scale phosphor screen forming apparatuses for intermittently moving a plurality of panel supports for mass production, and are separately provided separately from the phosphor screen forming apparatuses. It is formed by a method of forming a light absorbing layer and then forming a phosphor layer by a photo printing method using an exposure apparatus and a shadow mask as an optical mask.

First, a panel is mounted on a panel supporting stand stopped at a loading position of the phosphor screen forming apparatus.
In the next washing step, after the inner surface of the panel attached to the panel support was corroded with an ammonium fluoride aqueous solution,
Clean with pure water.

Next, the cleaned panel is sent to a photosensitive agent coating step by intermittent movement of a panel support, and the inner surface of the panel contains polyvinyl alcohol (PVA) and ammonium bichromate (ADC) as main components. After applying the photosensitive agent, the excess photosensitive agent is shaken by rotating at a rotation speed of about 200 rpm. Then, the photosensitive agent to be adhered to the inner surface of the panel is heated and dried by a quartz heater to form a photosensitive film 12 on the inner surface of the panel 11 as shown in FIG.

Next, the panel 11 on which the photosensitive film 12 is formed is removed from the panel support and the shadow mask 13 is removed.
And a pattern corresponding to the opening 14 of the shadow mask 13 is printed on the photosensitive film 12 by the exposure device.

Next, the shadow mask 13 is removed from the panel 11 on which the pattern 14 has been baked, and attached again to the panel support of the phosphor screen forming apparatus. After the unexposed portion of the photosensitive film is removed by heating, the film is heated and dried by a quartz heater to form a resist 15 having a pattern corresponding to the opening of the shadow mask as shown in FIG. 2B.

Next, the panel 11 on which the resist 15 is formed is sent to a black paint application step by intermittent movement of a panel support, and a black paint made of a tag solution is applied to the inner surface of the panel 11 on which the resist 15 is formed. After that, the panel 11 is rotated at a rotation speed of about 200 rpm to shake off excess black paint. Then, the black paint applied to the inner surface of the panel 11 is dried by heating with a quartz heater to form a black paint layer 16 shown in FIG.

Next, the panel 11 on which the black paint layer 16 is formed is sent to a peeling step by intermittent movement of the panel support, and the resist 15 is decomposed with an aqueous solution of sulfamic acid or hydrogen peroxide, and the resist 15 is removed. The black paint layer 16 on the resist 15 was peeled off and washed with pure water, and then dried by heating with a quartz heater.
As shown in (d), a stripe-shaped or matrix-shaped light absorbing layer 17 is formed.

Next, after infeed the formed panel 11 panel support base intermittent movement by pre-coating step of the light absorbing layer 17, and SiO ₂ was coated on its inner surface, and washed with pure water, quartz heater FIG. 2
The precoat 19 shown in FIG.

Thereafter, the panel support is sent to a phosphor slurry coating step by intermittent movement, and for example, a blue phosphor, PV
After applying a photosensitive phosphor slurry (first color phosphor slurry) containing A and ADC as main components, the panel 11 is moved by about 2 mm.
Rotate at a rotational speed of 00 rpm to shake off excess photosensitive phosphor slurry. Then heat and dry with a quartz heater,
As shown in FIG. 2F, a photosensitive phosphor slurry layer 20 is formed on the precoat 19.

Next, the panel 11 on which the photosensitive phosphor slurry layer 20 is formed is removed from the panel support, and a shadow mask 13 is mounted. The photosensitive fluorescent light formed on the inner surface of the panel 11 is exposed by an exposure device. A pattern corresponding to the opening 14 of the shadow mask 13 is printed on the body slurry layer 20.

Next, the shadow mask 13 is removed from the panel 11 on which the pattern has been printed, and is again mounted on the panel support of the phosphor screen forming apparatus. After removing the unexposed portions of the luminescent phosphor slurry layer 20, it is dried by heating with a quartz heater to form a blue phosphor layer 21B in a predetermined gap of the light absorbing layer 17, as shown in FIG. .

The step of forming the blue phosphor 21B is performed by a photosensitive phosphor slurry containing a green phosphor as a main component (second color phosphor slurry) and a photosensitive phosphor slurry containing a red phosphor as a main component (third slurry). 2 (h), and as shown in FIG. 2 (h), the green phosphor layer 2
1G and a red phosphor layer 21R are formed.

The three-color phosphor layers 21B, 21G,
The panel 11 formed with 21R is removed from the panel support at the unloading position, and the panel support from which the panel 11 is removed returns to the loading position.

As described above, when a phosphor screen is formed by using a large-scale phosphor screen forming apparatus for intermittently moving a plurality of panel supports and an exposure apparatus separately provided separately from the phosphor screen forming apparatus. At the initial stage of the formation of the phosphor screen or for the convenience of production, there is a case where an empty space is formed on the panel support base where no panel is attached. In such a case, the panel support on which the panel is not mounted is directly heated by the quartz heater provided in each step, and has a higher temperature than the panel support on which the panel is mounted. Therefore, when the panel is mounted on the panel support that has been heated to a high temperature in a subsequent process, the radiant heat from the panel support causes the photosensitive film or the photosensitive phosphor slurry layer applied to the inner surface of the panel to be heated. In addition, the black paint layer abnormally dries, resulting in a defective fluorescent screen due to abnormal shapes and dimensions of the formed light absorbing layer and phosphor layer, color mixture of the phosphor layer, and black paint residue.

Therefore, in this embodiment, before applying the photosensitive agent, the black paint, and the photosensitive phosphor slurry,
A sensor is used to detect whether or not the panel is mounted on the panel support, and if the panel is not mounted, the panel support is cooled selectively by flowing cold water through the panel support.

When the panel support is cooled in this way, the temperature of the panel support on which the panel is not mounted can be made similar to the temperature of the panel support on which the panel is mounted in a short time. Prevents heat fogging of the photosensitive film and photosensitive phosphor slurry layer and abnormal drying of the black paint layer, which may cause abnormalities in the shape and dimensions of the light absorbing layer and phosphor layer, color mixture of the phosphor layer, and residual black paint. The generation of a defective fluorescent screen can be eliminated, and the fluorescent screen can be formed stably.

That is, in the case where the panel support is not cooled, the temperatures of the panel support with and without the panel mounted before the application of the photosensitive agent and before the development of the photosensitive agent are measured, and the light formed thereafter is measured. The quality of the absorbing layers was compared, and the results shown in Table 1 were obtained. Further, the temperatures of the panel support on which the panel is mounted and the panel support on which the panel is not mounted before the first, second and third color phosphor slurries are applied are measured, and the quality of the phosphor screen formed thereafter is compared. The results shown in Table 2 were obtained. In these tables, the symbol 良好 indicates good quality, and the symbol △ indicates large deterioration in quality.

[0033]

[Table 1]

[Table 2] As shown in these tables, the temperature of the panel support on which the panel is not mounted is about 20 ° C. higher than that of the panel support on which the panel is mounted, and the quality is significantly deteriorated.

On the other hand, in the case where the panel cannot be mounted, the panel support is cooled by flowing cold water of about 5 ° C., as shown in Tables 3 and 4, where the panel support is mounted. Can be cooled to the same temperature as
Deterioration of the quality of the light absorbing layer and the phosphor screen formed thereafter can be prevented, and a phosphor screen of a desired quality can be stably formed.

[0035]

[Table 3]

[Table 4] In the above embodiment, the case where the sensor detects the presence or absence of the panel and cools the panel support to which the panel is not attached has been described, but the sensor detects the temperature of the panel support and cools it. You may.

In the above embodiment, the method of forming the phosphor screen having the light absorbing layer has been described. However, the present invention forms the blue, green, and red phosphor layers without forming the light absorbing layer. The present invention can be applied to a case where a phosphor screen having no light absorption layer is formed by repeating the steps.

[0037]

As described above, a panel is mounted on a panel support of a phosphor screen forming apparatus for intermittently moving a plurality of panel supports, and at least a phosphor layer is formed on a color cathode ray tube for forming a phosphor layer. In the method, the panel support on which the panel to which the photosensitive phosphor slurry is applied is selectively cooled to prevent thermal fogging of the photosensitive phosphor slurry and to prevent the phosphor layer from being abnormally shaped and sized and to have a fluorescent layer. It is possible to eliminate the occurrence of a defective fluorescent screen due to color mixing of the layers and to stably form the fluorescent screen.

[Brief description of the drawings]

FIG. 1 is a view showing a process of forming a black stripe type and a black matrix type phosphor screen according to an embodiment of the present invention.

2 (a) to 2 (h) are views showing main steps of the phosphor screen forming method, respectively.

FIG. 3 is a diagram showing a configuration of a color cathode ray tube.

FIG. 4A is a plan view showing a configuration of a black stripe type fluorescent screen, and FIG. 4A is a sectional view thereof.

FIG. 5A is a plan view illustrating a configuration of a black matrix fluorescent screen, and FIG. 5A is a cross-sectional view thereof.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 ... Panel 12 ... Photosensitive film 13 ... Shadow mask 14 ... Opening 15 ... Resist 16 ... Black paint layer 17 ... Light absorption layer 20 ... Photosensitive phosphor slurry layer 21B ... Blue phosphor layer 21G ... Green phosphor layer 21R ... Red phosphor layer

Claims (4)

[Claims] At least a photosensitive phosphor slurry is applied to an inner surface of a panel attached to the panel support by a phosphor screen forming apparatus for intermittently moving a plurality of panel supports, and is heated and dried to form a photosensitive phosphor. After forming the body slurry layer, a pattern corresponding to the opening of the shadow mask is baked on the photosensitive phosphor slurry layer by an exposure device separately provided from the phosphor screen forming device, and then the baked panel of this pattern is baked. A method for forming a phosphor layer of a color cathode ray tube by forming a phosphor layer by attaching and developing to a panel support of the phosphor screen forming apparatus, wherein the panel support on which a panel for applying the photosensitive phosphor slurry is attached is mounted. A method for forming a phosphor screen of a color cathode ray tube, characterized by selectively cooling. 2. A photosensitive surface is applied to an inner surface of a panel attached to the panel support by a phosphor screen forming apparatus for intermittently moving a plurality of panel supports, and then heated and dried to form a photosensitive film. A pattern corresponding to the opening of the shadow mask is printed on the photosensitive film by an exposure device separately installed from the phosphor screen forming apparatus, and then the panel with this pattern printed is mounted on a panel support of the phosphor screen forming apparatus. Developing and heating and drying to form a resist having a pattern corresponding to the opening of the shadow mask, then applying a black paint on the inner surface of the panel on which the resist is formed, and heating and drying to form a black paint layer. Further, together with the resist, the black paint layer applied on the resist is peeled off to form a light absorbing layer, and the light absorbing layer is formed on the inner surface of the panel. After coating the photosensitive phosphor slurry and drying by heating to form a photosensitive phosphor slurry layer, the photosensitive phosphor slurry layer is opened with an exposure device separately provided from the phosphor screen forming device to open a shadow mask. In the method of forming a phosphor screen of a color cathode ray tube, the panel corresponding to the pattern is baked, and then the baked panel of the pattern is attached to a panel support of the phosphor screen forming apparatus, developed, and dried by heating to form a phosphor layer. A method for forming a phosphor screen of a color cathode ray tube, comprising selectively cooling a panel support on which a panel to which the photosensitive agent, black paint and photosensitive phosphor slurry are applied is mounted. 3. Detecting the presence or absence of a panel on a panel support,
3. The method according to claim 1, wherein only the panel support on which the panel is not mounted is cooled. 4. The method for forming a fluorescent screen of a color cathode ray tube according to claim 1, wherein the temperature of the panel support is detected and only the panel support heated to a predetermined temperature or higher is cooled.