JPS62128419A - Productional identification cord for cathode-ray tube - Google Patents

Abstract

PURPOSE:To ease the formation of an identification cord by removing a light absorbing film formed on the inner surface of the skirt part of a glass panel by means of identification cord patterns and further coating a metal deposition film on a glass face where the light absorbing film is removed. CONSTITUTION:A graphite (light absorption) film adhered on the inner face of the skirt part 31a of a glass panel 31 is removed by means of patterns representing identification cords 60, luminous face is formed on the inner face of the glass panel 31, and a metal vapor deposition film 35 is thereafter adhered at the portion where the light absorbing film is removed, thus the identification cord is formed, whereby it can be seen from the outside of the skirt part 31a of the glass panel 31, thus any damages do not happen due to the heat treating process, reading can be eased as the difference of reflection rate between the identification cord 60 and the back is extremely large, while, even if spot or the like is adhered to the outer face of the skirt part 31a of the glass panel 31 where the identification cord is set, it can be removed easily and at that time no damage will occur on the identification cord.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention provides a method for identifying the types and specifications of each cathode ray tube in an automated cathode ray tube manufacturing process. This invention relates to a manufacturing identification code to be displayed (hereinafter simply referred to as an identification code).

[Prior Art] First, an outline of the manufacturing process of a color cathode ray tube, which is the most common type of cathode ray tube, will be explained with reference to FIGS. 5 and 6.

Figure 5 is a block diagram of the manufacturing process, Figures 6 (a) to (e)
1 is a cross-sectional view of the cathode ray tube at each step.

First, a shadow mask (30) is manufactured in a shadow mask manufacturing process (20). Shadow mask (30
) is made by press-forming a thin steel plate with many square or circular holes into a predetermined curved surface and welding it to a frame.
A spring plate is attached for fixing to the glass panel (31).

Next, this shadow mask (30) is combined with a pair of glass panels (31), and if necessary, is sent to a phosphor screen manufacturing process (21) through a heat treatment process.

In this step (21), as shown in FIG. 6(a).

First, a light-absorbing material, such as a graphite film (32), is formed using a photographic method in a region that limits the light-emitting area of the phosphor screen in a mosaic pattern. In this case, the glass panel (
The graphite film (
32) is formed. After that, by applying the same photographic method, phosphors (33) that emit green, blue, and red light are formed in a mosaic shape at predetermined positions, and finally, in a process called filming, phosphors of the three primary colors are formed. An organic thin layer (34) is formed on the graphite film (33) and the graphite film (32), and the phosphor screen manufacturing step (21) is completed.

Next, the glass panel (31) is sent to an aluminum vapor deposition process (22), and an aluminum vapor deposition device corresponding to the size of the glass panel (31) is used to form a phosphor mosaic (33), an organic thin film (32), and a glass panel skirt. On the part (31a), there is aluminum vapor deposition (35).
) is formed to form the glass panel (3) shown in FIG. 6(a).
1) is completed. Next, the glass panel (31) is attached to the previously combined shadow mask (30) as shown in FIG. 6(b).
As shown in FIG. 2, the organic thin film (35) formed in the phosphor screen manufacturing process (21) is decomposed and removed by baking.

Next, attach the internal magnetic shield (3) to the glass panel (31).
9) is attached and sent to the frit sealing process (25). In this step (25), the funnel processing step (2
After cleaning in step 4), the inside is coated (3G) and the funnel (38) with low melting point glass (37) applied to the sealing surface is placed in a predetermined jig (as shown in Fig. 6(C)). 50), heat treatment is performed, and the glass panel (31) and the funnel (38) are fused with a low melting point glass (37).

Next, in the electron gun sealing step (26), the electron gun (40) is held in a predetermined position within the neck of the funnel (38) using a predetermined jig, and a rotary seal equipped with a large number of gas burners is installed. The stopper welds and fixes the neck glass and the base stem glass of the electron gun (40) as shown in FIG. 6(d).

Next, in the evacuation step (27), the tip tube (41) coming out of the electron gun stem is mounted on a predetermined evacuation stand, and after the inside of the tube is evacuated to a high vacuum, the tip tube (41) is heated and welded. The color cathode rays shown in FIG. 6(e) are obtained. Thereafter, a getter (42) is heated and vapor-deposited while maintaining the inside of the tube at a high vacuum, and then the cand of the electron gun (4o) is activated and seasoning is applied to improve the withstand voltage characteristics to complete the tube.

Next, in the inspection process (28), the characteristics of the cathode ray tube are checked by each test machine (28).
Those that pass this inspection are sent to the explosion-proof treatment process (
28), and the outer casing (43) and gold A (44) for explosion-proof treatment are carried out, etc., and the manufacturing process of the color cathode ray tube is completed.

[Problems to be solved by the invention] Recently, the conventional manufacturing processes mentioned above have been automated, and various robots have been introduced.

Efforts have been made to make the jig flexible. Along with such automatic control of production, automation of the entire manufacturing process, so-called FA, is progressing to clarify the history of the manufacturing process of each product and to understand the quality and yield of the product.

In this case, the parts that make up the product, such as glass panels (
31) Information specifying product specifications, post-process specifications, and labels for recording the jigs used (hereinafter referred to as identification codes) are given to the product, and the post-process reads out the identification code and records its contents. It is necessary to process the glass panel in accordance with the applicable specifications, and also to record which jig was used for the glass panel.

Conventionally, as a means for providing such an identification code, stamping or stamping is performed on the outer surface of the skirt portion (31a) of the glass panel. However, this display using stamps or seals can cause misreading of information due to dirt on the display surface, or the stamp may fall off during the heat treatment process, or even the erasure of the stamp for reuse in the event of a defect during the manufacturing process. There were problems such as difficulty.

This invention was made to solve the above-mentioned problems, and it is an object of the present invention to obtain an identification code having a configuration suitable for manufacturing cathode ray tubes using an automated line.

[Means for Solving the Problems] The identification code according to the present invention is obtained by removing a light-absorbing film coated on the inner surface of the skirt portion of a glass panel in a pattern representing the identification code, and applying fluorescent light to the inner surface of the glass panel. After forming the surface, a metal vapor deposition film is applied to the portion from which the light absorbing film has been removed to form an identification code, which is visible from the outside of the skirt portion of the glass panel.

[Function] The identification code is formed on the inner surface of the skirt portion of the glass panel with a metallic luster surface backed by a light-absorbing film. Therefore, there is no damage caused by heat treatment process, etc.
In addition, since the difference in light reflectance between the sign code and the background is extremely large, it is easy to read, and even if dirt or the like adheres to the outer surface of the skirt of the glass panel on which the sign code is attached, it will be easier to read. It can be easily removed and there is no risk of damaging the identification code. [Embodiment of the Invention] An embodiment of the invention will be described below with reference to the drawings.

Figure 1 shows the identification code (60) formed according to this embodiment.
, the skirt part (31a) of the funnel glass (31)
In Figure 0, which is a view from the outside.

(31b) is the transparent part removed by trimming the graphite film (32), (31c) is the joint surface with the funnel, and (35) is the inner surface of the skirt (31a) from which the graphite film (32) has been removed. The aluminum vapor-deposited film is visually recognized as a marking code (60) that follows the pattern from which the graphite film (32) has been removed.

FIG. 2 is a conceptual diagram for explaining an example of a method for forming an identification code (80). It is removed using the pattern (60). That is, after cleaning the inner surface of the glass panel (31), a PVA-dichromium salt-resistant resist (4
5) is applied and dried on the inner surface of the glass panel (31), and then, as shown in the figure, a latent image of the identification code is formed by an automatic printing device (46) which outputs the specified identification code using a glass spring. Next, put on the shadow mask, perform the prescribed exposure, remove the shadow mask,
Develop to form a resist pattern. Next, a graphite liquid, which is a light-absorbing material, is applied onto this resist pattern and dried by heating to form a graphite film (32). Then, it is treated with an oxidizing agent such as hydrogen peroxide,
After the resist film (45) is decomposed to lose its adhesive strength, it is developed (I) times with pressurized pure water to remove the graphite Il! on the resist pattern and identification code latent image. 2 (32
), then trim the skirt part (
A predetermined area of the graphite film (32) is removed from the bonding surface (31c) of the glass panel (31a).
31), the formation of the black matrix on the display surface and the formation of the identification code base of the skirt portion (31a) are completed. .

Next, the phosphor film (33) is formed by applying the photographic method to green,
This process is repeated for blue and red phosphors, and the identification code formed during this process will never deform or disappear.After the phosphor screen is formed, an aluminum evaporation process (22) is performed, and the aluminum evaporation process (22) is performed. ,Wlli(
35) is also adhered to the inner surface of the glass panel skirt portion (31a) from which the graphite film representing the identification code has been removed, thereby forming an identification code (60). The identification code (60) formed as described above becomes defective in the following manufacturing process and is returned to the phosphor screen manufacturing process (21) and will not disappear unless the inner surface is cleaned.

Note that the exposure of the identification code (60) to the resist film (45) may be performed during the three-color exposure for forming the black matrix, or may be performed immediately before the resist phenomenon. It goes without saying that the identification code at the time of exposure is an identification code that is sent in accordance with the production content from the central control unit (1) that monitors the entire manufacturing process.

FIG. 3 is a conceptual diagram for explaining another example of the method of forming the identification code (60). In this example, the identification code is It forms the base. In other words, as shown in the figure, the glass panel (
31) after fixing it in place.

Central control unit! The identification code is formed by the identification code etching device m (48) in accordance with the instruction from the phosphor screen manufacturing process control terminal device (47) based on the identification code instructed from (1). For example, an acidic ammonium fluoride aqueous solution (48) is introduced into the pen part (48a) of this identification code etching device (48), and the liquid is supplied to the pen part (48a) by a solenoid valve S during action. It is composed of If the identification code is made up of English letters or the like, a robot is required, but if it is made up of a barcode, it can be drawn with a simple device having a large number of pen units (48a). After the etching of this identification code and the trimming of the graphite film (32) are completed,
Subsequent washing with water removes graphite [(32) other than the necessary parts, completing the phosphor screen manufacturing process (21), followed by an aluminum vapor deposition process (22) to create the identification code (8).
0) is formed.

FIG. 4 is a conceptual diagram for explaining the processing procedure in the frit sealing step (25) of a glass panel (31) equipped with an identification code (80) according to the present invention. (31) Identification code (80
) is read with an optical reader (2).

Based on the read identification code (60), the frit sealing process control terminal device (3) controls the jig removal line (
4) A predetermined jig is taken out, and the funnel (38) to be combined is carried in, and the frit old city process (25) explained in FIG. 6(C) is executed.

In addition, in the next electron gun sealing step (26), the electron gun (40) to be combined is automatically fed into a predetermined sealing jig based on the read identification code (80). , sealing is performed with predetermined dimensions. In addition,
Needless to say, the input/output of the identification code (60) in each process is performed in the same manner as in the conventional printing type.

Although the above explanation shows an example in which the identification code is composed of Arabic numerals and alphabetic characters, the identification code is not limited to this example, and may be a bar code, for example.

[Effects of the Invention] As described above, according to the present invention, the graphite film adhering to the inner surface of the skirt portion of the glass panel is removed in the same pattern as the marking code, and the aluminum evaporation process in the manufacturing process of the cathode ray tube is improved. Since the aluminum vapor-deposited film is applied to the portion from which the graphite film has been removed to form the identification code, the formation of the separate a code is simple.

Furthermore, since the identification code according to the present invention is formed of a graphite film and an aluminum vapor-deposited film on the inner surface of the skirt portion of the glass panel, it will not be damaged in subsequent processes and will not cause reading errors. It can be applied to automated cathode ray tube manufacturing equipment with great effects, such as being able to be easily erased when recycling glass panels.

[Brief explanation of drawings]

FIG. 1 is a partially enlarged view of a glass panel skirt showing an example of the identification code according to the present invention, and FIGS. 2 and 3 each illustrate one method for forming the identification code according to the invention. 4 is a conceptual diagram for explaining the operation in the frit sealing process of a glass panel equipped with an identification code according to the present invention, and 5rI4 is a block diagram showing the manufacturing process of a color cathode ray tube. Figure 6 (a
) to (e) are diagrams for explaining the work contents in each manufacturing process, respectively. (31)...Glass panel, (31a)...Skirt portion. (32)...graphite film, (35)...aluminum vapor deposition, (fio)...identification code. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Claims] (1) A cathode ray produced by removing the light-absorbing film deposited on the inner surface of the skirt portion of the glass panel in an identification code pattern, and then depositing a metal vapor-deposited film on the glass surface from which the light-absorbing film has been removed. Manufacturer's identification code for the tube.