JPS62154524A - Manufacture of color cathode-ray tube - Google Patents

Abstract

PURPOSE:To prevent the occurrence of loading on a shadow mask due to the sticking of foreign substances, by applying a doming suppressor material to a shadow mask surface, and performing heat treatment after irradiating it with laser beams. CONSTITUTION:An organic metallic polymer or a doming suppressor material such as semiconductor glass or the like is applied to a shadow mask, if possible, the whole surface at the side of at least an electron gun 11, and YAG laser or carbonic gas laser beams are irradiated from the side or both sides of the electron gun 11 whereby stabilizing treatment, which heats it at a temperature of 400-430 deg.C, takes place, while a doming suppressor material is dissolved and stuck to it, and the whole surface inclusive of an electron beam passage hole 5a of the shadow mask surface 5 is covered with a doming suppressor coat 5b of 20-50mum in thickness. In this case, application of the doming suppressor material and laser irradiation should be done in a dust removing ambience. In this connection, as laser heating conditions, the laser irradiation should be done in a N2 gas ambience.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a method of manufacturing a color cathode ray tube.

In particular, it relates to a method for processing the shadow mask.

[Conventional technology]

Generally, color cathode ray tubes have blue on the inside of the panel.

A large number of dot holes or slot holes are drilled to select the electron beams to be emitted by colliding the electron beams with green and red three-color phosphor dots or a phosphor screen formed in the shape of a drive. A shadow mask is attached.

This type of shadow mask is known, for example, from Japanese Patent Application Laid-Open No. 60-915
As disclosed in Japanese Patent No. 34, a coating layer with a low coefficient of thermal expansion and low thermal conductivity is formed on at least the main surface on the electron gun side of the shadow mask, and then an organic film is formed on this coating layer, and then, It is manufactured by forming a doming-suppressing wave on the surface by heat treatment.

[Problem that the invention seeks to solve]

Conventional shadow masks are manufactured through a process of heat treatment in a baking oven, so dust and other particles in the baking oven tend to adhere to the molten low thermal expansion material, causing the shadow mask to become clogged. There is a problem in that the electron beam is obstructed from passing through and the image quality is degraded.

The present invention eliminates clogging of the shadow mask due to adhesion of foreign matter such as dust and dirt in the atmosphere.

It is an object of the present invention to provide a method for manufacturing a cathode ray tube that can obtain a shadow mask structure with a clean surface.

[Means for solving problems]

In the present invention, a doming suppressing material is applied to the shadow mask surface, and a heat treatment is performed by irradiating the material with laser light.

[Effect]

The shadow mask surface is heated to a high temperature by laser beam irradiation, and the doming suppressing material is melted and firmly adhered to form a doming suppressing coating that is difficult to peel or fall off.

〔Example〕

Hereinafter, the present invention will be explained in detail using the drawings.

FIG. 1 is a sectional view of a main part of a cathode ray tube for explaining an embodiment of the method for manufacturing a color cathode ray tube according to the present invention. In the figure, the color cathode ray tube has an envelope composed of a panel section 1, a funnel cone section 2, and a funnel neck section 3.

On the inner surface of the panel section 1, a dot or stripe-shaped phosphor screen that emits red, green, and blue light is formed. A shadow mask structure 6 is provided in which a dot or slot-shaped electron beam passing hole 5a is formed in the shadow mask 5, and the entire surface of the shadow mask structure 6 is coated with a doming suppressing coating 5b. The shadow mask structure 6 is supported and fixed by a support frame 7 having a cross-sectional shape, and the support frame 7 is connected via a spring 8 to a panel bin 9 installed on the inner wall of the panel section 1. It has been stopped. On the other hand, in-line electron guns 11 are housed in the neck part 3 and are arranged in a line along the horizontal direction of the panel part 1 and emit three electron beams 10 corresponding to red, green, and blue. .

The color cathode ray tube constructed in this manner is manufactured through the steps shown in FIG. That is, first, after assembling a shadow mask assembly by welding the shadow mask 5, the support frame 7, and the spring 8, the conditions described below are preferably applied to at least the entire surface of the shadow mask 5 on the electron gun 11 side of the shadow mask assembly. A doming-suppressing material such as an organometallic polymer or semiconducting glass is applied with
A stabilization process is performed by irradiating this shadow mask assembly with YAG laser or carbon dioxide laser light under the conditions described later from the electron gun 11 side or both sides thereof and heating it at 400 to 430°C, and the doming suppressing material is melted and attached. As shown in FIG.
The doming suppressing film 5b is coated with a thickness of approximately s. In this case, application of the doming suppressing material and laser irradiation are performed in a dust-free atmosphere. On the other hand, the inner surface of panel part 1 is red.

Green and blue phosphor films are applied, a phosphor screen without AM vapor deposition is formed, and then panel baking is performed to thermally decompose the resin used in forming the phosphor screen. Next, on this panel part 1,
A shadow mask assembly having a shadow mask structure 6 coated with the above-mentioned doming suppressing coating 5b is attached, and this panel mask assembly is attached to the funnel coat shown in FIG.
Perform frit baking to bond with the ring part 2. Next, a stem structure (not shown) equipped with the electron gun 11 described above is sealed to the funnel neck portion 3, exhaust and aging are performed, and a reinforcing band is attached near the frit seal portion to complete the process.

In this case, the doming suppressing material and laser heating in the embodiments described above are used under the following conditions.

(1) As the doming suppressing material, polytitanocarbosilane containing Si, TxtC+H+O as main components is used as an organic metal polymer, for example. In addition, v205 (60wt%) and 3aO (10w%) are used as semiconductor glasses.
t%)y P 20G (30wt%) as the main component,
Powder with an average particle size of about 7 tones.

A solution of nitrocellulose and isoamyl acetate in a solvent is applied as a binder.

(2) Laser heating conditions include irradiation in a N2 gas atmosphere.

(a) For YAG laser Wavelength: 1.06/ffi Energy density: 150 to 200 W/ad Beam diameter:
7.5nnφ scanning speed: 120n*n/s Oscillation frequency: IKHz (b) For carbon dioxide laser Wavelength: 10.6mm Energy density = 150 to 170W/aiF bi-
Diameter: 7. Onoφ scanning speed: 150mm/
s Oscillation frequency: 200 Hz In such a method, after assembling the shadow mask and other support frames, etc., the shadow mask structure 6 is coated with a doming suppressing material and heated by irradiating the shadow mask with laser light. At the same time, the doming suppressing material applied to the shadow mask 5 is heated to a high temperature and melted, and '
Since the doming suppression coating 5b is formed by JPy deposition, the coating has extremely good heat resistance and strength, and a color cathode ray tube with less peeling of the doming suppression coating 5b and less shedding of material particles can be obtained. Moreover, this doming suppression coating 5
b is formed in a stabilizing process by laser beam irradiation and heating before combining the shadow mask assembly and panel part 1 and exposing to light to form a phosphor screen. Therefore, the film is easily formed with almost no increase in the number of steps. Moreover, it can be formed easily and in a short time. Moreover, this doming suppression coating 5
b is formed by applying a doming suppressing material to the shadow mask 5 and heating it by laser beam irradiation in a dust-free atmosphere, so that a shadow mask structure 6 with no dust attached and a clean surface can be obtained. .

Furthermore, this doming suppressing film 5b is formed by irradiating laser light and heating only the shadow mask 5 coated with the doming suppressing material.
Since the number of times that the support frame 7, spring 8, etc. that support and fix the device are heated is reduced, the blackened film (Fe, 04) that is formed on the surface of the protective film is less likely to peel off, and the occurrence of rust is reduced. It can be reduced. Furthermore, by using laser light to form the doming suppressing coating 5b, only the shadow mask 5 coated with the doming suppressing material can be heated in a concentrated manner, making it possible to form the film in a short time. By setting the luminous flux to the thickness of the electron beam passage hole, the splash part of the doming suppressing material coating film that protrudes into the electron beam passage hole is burned off, and the corner becomes a curved surface that follows the shape, making it possible to A good electron beam passing hole is formed. In addition, by setting the laser beam used for forming the doming suppressing coating 5b to an oscillation wavelength that can be well absorbed by the doming suppressing material, efficient heating becomes possible.
The doming-suppressing coating 5b can be formed in an even shorter time.

FIG. 4 is a process diagram showing another embodiment of the method for manufacturing a color cathode ray tube according to the present invention. The difference between this figure and FIG. 3 is that after applying the doming suppressing material to both sides of the shadow mask surface 5,
In combination with the panel part 1 shown in the figure, a stabilization process is performed by irradiating laser light from the front side of the panel part 1 and the electron gun 10 side of the shadow mask assembly to heat it at 400 to 430 degrees Celsius. As shown in FIG. 2, the surface of the shadow mask 5 is coated with a doming suppressing film 5b having a thickness of approximately 20 to 50 mm. Thereafter, a color cathode ray tube is completed through the same steps as in Example 1.

According to such a method, in the stabilizing treatment process in which the panel part 1 and the shadow mask assembly are combined and heated by irradiating laser light from both sides, the shadow mask 5 coated with the doming suppressing material is irradiated with the laser light, The surface to which this material is applied is heated to a high temperature, and the doming suppressing film 5b is formed in a short time.

In still another embodiment of the method for manufacturing a color cathode ray tube according to the present invention, in the panel baking step after forming the phosphor screen, a doming suppressing material is applied to the shadow mask 5 and is fixed to the inner wall of the panel section 1, and the laser When the baking process is performed by irradiating light, the shadow mask 5 is simultaneously irradiated and heated, whereby the same doming suppressing film 5b as described above can be formed.

In the above-mentioned embodiments, an organic metal polymer and a semiconductor glass were used as doming suppressing materials, but the present invention is not limited thereto. Of course, even if glass is used, the same effect as described above can be obtained.

〔Effect of the invention〕

As described above, according to the present invention, the occurrence of clogging of the shadow mask due to adhesion of foreign matter is reduced, so that the passage of the electron beam is improved, and the image quality can be significantly improved. In addition, since the doming suppression film is firmly formed on the shadow mask, it is less likely to peel or fall off, and the withstand voltage characteristics can be improved.
Extremely excellent effects such as being able to reduce the occurrence of doming can be obtained.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of a main part of a color cathode ray tube manufactured by the method for manufacturing a color cathode ray tube according to the present invention, FIG. 2 is an enlarged cross-sectional view of a main part of the shadow mask surface, and FIG. FIG. 4 is a process diagram showing another embodiment of the method for manufacturing a color cathode ray tube according to the present invention. 1...Panel part, 2...Funnel cone part, 3.
...Funnel neck part, 4...Phosphor screen, 5...Shadow mask, 5a...' Multiplex beam passage hole, 5b...
... Doming suppression coating, 6... Shadow mask structure, 7... Support frame, 8... Spring, 9
...Panel pin, 1...Panel part 7
... Support frame 2 ... Funnel cone part
8...Spring 3...Funnel neck part
9... Banel pin 4... Fluorescent m
10...Electron beam 5...Shadow mask surface
11... Electron gun 6°° Shadow mask structure 5th... Electron beam passage hole 5b... Doming suppression coating Figure 4

Claims (1)

[Claims] 1. An electron gun that shoots an electron beam at a phosphor screen formed on the inner surface of the panel, and a shadow mask that has a large number of dot holes or slot holes that are arranged facing each other on the inner surface of the panel and that selects the electron beams. 1. A method for manufacturing a color cathode ray tube comprising at least the following: a step of applying a doming suppressing material to the shadow mask surface, irradiating it with laser light, and subjecting it to heat treatment.