JPH0451424A - Manufacture of fluorescent screen black-matrix film of color-picture tube - Google Patents

Abstract

PURPOSE:To eliminate concentration nonuniformity and enable stable production of a fine film, by applying a graphite suspension under a specific pressure onto a hardened resin film cured by photosensitizing. CONSTITUTION:A graphite suspension is applied under a pressure controlled from 0.01[kg/cm] to 0.10[kg/cm] onto a hardened resin film cured by photosesitizing. The graphite suspension in a graphite suspension tank 7 is sent under pressure by a pump 6, and flocculated substrate is removed by a filter 5. After reducing the pressure to a range from 0.01[kg/cm] to 0.10[kg/cm] by using a constant pressure regulator 9, the graphite suspension 3 is ejected from an application nozzle 4 via an electromagnetic valve 12. The graphite suspension 3 is applied to the entire area of the hardened resin film 2 cured by photosensitizing that is formed over the inner surface of a glass panel 1 which is subjected to developing-process with warm water while turning the glass panel 1. After that a fine black-matrix film without any concentration nonuniformity is formed over the inner surface of the glass panel 1 through a process comprising foreshaking, drying, and etching.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for manufacturing a phosphor black matrix film for a color picture tube.

[Conventional technology]

Generally, in a black matrix type color picture tube, in order to improve contrast, a phosphor screen is formed by filling the spaces between green, blue, and red phosphor pixels with a non-light-emitting light-absorbing material, such as graphite. A film formed from this non-light-emitting light-absorbing material is called a black matrix film, and the following methods are available for forming this film.

First, after cleaning the inner surface of the glass panel with hydrofluoric acid and pure water, apply a photosensitive resin solution containing polyvinyl alcohol and ammonium dichromate, or a photosensitive resin solution containing polyvinylpyrrolidone and azide to the inner surface. Then, by rotating the glass panel at high speed, the photosensitive resin film is spread uniformly. Next, the photosensitive resin film is dried using a far-infrared heater and a blower placed opposite the glass panel. Next, a portion of the photosensitive resin film is photocured by exposure to ultraviolet light through a shadow mask placed a certain distance from the inner surface of the glass panel. At this time, the photocured resin film is located at a position where green, blue, and red phosphor pixels will be formed later, and exposure is usually performed three times by changing the relative position of the glass panel and the light source. Next, the shower mask is removed and the panel is developed with warm water, leaving only the photocured resin film on the inner surface of the panel. Next, a graphite suspension 3 is applied to the entire surface of the photocured cured resin film 2 formed on the inner surface of the glass panel 1, as shown in FIG. As for the coating method, the graphite suspension in the graphite suspension tank 7 is pumped by a pump 6, aggregates are removed by a filter 5, and then passed through a solenoid valve 12 and ejected from a coating nozzle 4 to a rotating glass panel. This is done by applying it to the inner surface of 1. Next, the glass panel coated with the graphite suspension is rotated at high speed to spread the graphite suspension uniformly, and then the graphite suspension is dried by a far-infrared heater placed opposite the glass panel to form a graphite film. After forming, soak it in hydrogen peroxide solution,
The photosensitive cured resin film is swollen and removed together with the graphite film deposited thereon by hot water spray to form a black matrix film on the inner surface of the panel. Next, green, blue, and red phosphor pixels are formed at each position of the black matrix hole, and a filming film is applied so that the aluminum film is smooth, and then an aluminum film is formed by vacuum evaporation. Heat treatment burns out the filming film and completes the phosphor screen of the color picture tube.

[Problem to be solved by the invention]

However, in the conventional method for manufacturing the black matrix film for the phosphor screen of a color picture tube described above, there is nothing to control the pressure for applying the graphite suspension 3, as shown in FIG. The turbid liquid 3 hits the inner surface of the glass panel 1 with force and scrapes a part of the photosensitive cured resin film 2. As a result, the area of the cured resin film 2 becomes partially small, and when the black matrix film is formed, graphite suspension is removed. The area of the black matrix hole in the area hit by the turbid liquid 3 becomes smaller,
This causes the problem of uneven shading as shown in FIG. 4, which deteriorates the quality of the phosphor screen of the color picture tube.

In addition, as a result of lowering the pressure of the pump 6 in an attempt to solve the above problem, the graphite suspension 3 could not reach the inner surface of the glass panel due to the clogging of the filter 5, resulting in the problem that a black matrix film could not be formed. was. As a result of measuring the coating pressure of graphite suspension 3, it was found to be 0.10 (k
If the pressure exceeds 0.0 g/cm2), uneven density will occur.
At a pressure lower than 1 kg/cm2, the graphite suspension 3 could no longer reach the inner surface of the glass panel 1.

[Means to solve the problem]

The method for manufacturing a phosphor screen black matrix film for a color picture tube according to the present invention is to apply a photosensitive hardened resin film to a 0.01 (k
g/cm2:] to 0.10 [kg/cm2].

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a diagram for explaining a first embodiment of the manufacturing method of the present invention. First, the graphite suspension in the graphite suspension tank 7 is pumped from 1.0 Ckg/cm2) to 2
, 0 [kg/cm2], the filter 5 removes aggregates, and the constant pressure device 9 passes the pressure of 0.01 [kg/cm2].
cm2) to 0.10 Ckg/cm2), the graphite suspension 3 is ejected from the coating nozzle 4 through the solenoid valve 12, and is formed on the inner surface of the glass panel 1 after being developed with hot water. The graphite suspension 3 is applied to the entire surface of the photosensitive cured resin film 2 while rotating the glass panel 1. Thereafter, a good black matrix film with no unevenness in density could be formed on the inner surface of the glass panel 1 through the processes of shaking off, drying, and etching in the same manner as in the conventional method.

FIG. 2 is a diagram showing a second embodiment of the present invention. The flow rate control valve 11 is opened and closed according to the pressure detected by the pressure sensor 10, and a part of the graphite suspension 3 that has exited the filter 5 is returned to the graphite suspension tank 7, and the graphite suspension sprayed from the coating nozzle 4 is The pressure of the suspension 3 is controlled to be 0.01 [kg/cm2'J to 0.10 [kg/cm2]], and the slurry 3 is applied to the entire surface of the photosensitive cured resin film 2 formed on the inner surface of the glass panel 1.

In this embodiment, even when the solenoid valve 1.2 is closed, a part of the graphite suspension that has passed through the pump 6 returns to the graphite suspension tank 7, so the load on the pump 6 is reduced and the pump 6 is operated for a long time. It has the advantage of long life.

〔Effect of the invention〕

As explained above, in the method for manufacturing a phosphor black matrix film for a color picture tube according to the present invention, a photosensitive hardened resin film is coated with 0.01 [kg/cm2] to 0.10 (kg/cm2).
The graphite suspension is applied at a pressure controlled to /cm2:]. This has the effect of stably producing a high-quality black matrix film with no unevenness in density.

The second graphite suspension coating step in the manufacturing method of RISK film
Figure 3 is a diagram to explain the graphite suspension coating step in a conventional method for manufacturing a phosphor screen black matrix film for a color picture tube, and Figure 4 shows the occurrence of uneven shading. FIG. 3 is an external view of a black matrix film.

DESCRIPTION OF SYMBOLS 1...Glass panel, 2...Photocured resin film, 3...Graphite suspension, 4...Coating nozzle, 5...
・Filter, 6... Pump, 7... Graphite suspension tank, 8... Stirrer, 9... Constant pressure regulator, 10... Pressure sensor, 11... Flow rate control valve, 12... ·solenoid valve.

Claims (1)

[Scope of Claims] A black matrix type color in which three types of phosphor pixels of green, blue, and red are formed on the inner surface of a glass panel, and the space between each phosphor pixel is filled with a non-emissive light-absorbing material to form a phosphor screen. In a method for producing a black matrix film for a fluorescent screen of a picture tube, a photosensitive hardened resin film is coated with 0.01 to 0.10 kg/c.
A method for producing a black matrix film for a phosphor screen of a color picture tube, characterized in that a graphite suspension is applied at a pressure of [m^2].