JPS59217941A - Cathode-ray tube for light source - Google Patents

Abstract

PURPOSE:To reduce the manufacturing time of a phosphor screen and its material by dividing a specified length section that is stretched toward the other end side from the glass inner wall of a face section into two or more sections and individually screening and separating each divided face section. CONSTITUTION:A glass tube main frame 1 has the 29phi cylindrical screen size and a phosphor screen section that is divided into three at equal intervals of 120 deg. from the central part of an axis by a glass plate 53. Each is fully separated by the glass plate 53 for dividing and screening and the thickness of the plate 53 is the same as the main frame 1. A specified quantity of an aqueous solution 52 as an electrolyte is injected simultaneously into the three-divided main frame 1 from an injection nozzle 51 and subsequently suspensions 62a to 62c in which a green phosphor 3a, blue phosphor 3b, and red phosphor 3c are dispersed separately are quickly injected simultaneously into an aqueous solution as a bonding agent from injection nozzles 61a to 61c. Furthermore, supernatant liquid is exhausted and the phosphor is made to adhere to. As a result, the production time of a phosphor screen and its material can be reduced and a cathode-ray tube for a light source that can improve the resolution of a giant display unit can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cathode ray tube for a light source used in display devices and the like.

With the diversification of Tisfrei, various giant display devices have been developed, but as a method suitable for color display and video reproduction, each of the three primary color picture elements is replaced with a single cathode ray tube, and tens of thousands of display devices are developed. There is a method that uses ~100,000 cathode ray tubes. Such a cathode ray tube is called a light source cathode ray tube, and can also be described as a light emitting element.

An example of the structure of a cathode ray tube for a light source is shown in FIG.

In the figure, (1) is the cylindrical glass tube body that constitutes the vacuum envelope, and its face (2) is equipped with one type of phosphor (3) that emits green, bluish, or red light. ) is coated. An aluminum vapor-deposited film (4) called a 1φ metal μ back is formed on the inner surface of the phosphor (8), and a graphite film (5) is further formed as an internal conductive film for the purpose of electrical continuity. ) is completely coated. (6) is an electron gun that emits electrons in response to a signal to cause the phosphor to emit light.

Next, the manufacturing method of such a cathode ray tube for light source is shown in Figure 2 (a).
) to FIG. 2(0). First, the inner surface of the glass tube body (1) to which the phosphor (8) is attached is cleaned using a hydrofluoric acid aqueous solution, a sodium hydroxide aqueous solution, and pure water. Next, as shown in FIG. 2(a), for example, a predetermined amount of an aqueous solution of barium acetate as an electrolyte is injected, and then a predetermined phosphor (3) is dispersed in an aqueous solution of water glass as an adhesive. The suspension is injected and allowed to stand for a predetermined period of time to precipitate the phosphor (3). After the phosphor (3) has precipitated, the glass tube body (1) is slowly tilted to drain the supernatant liquid, and the phosphor (3) is dried with dehumidifying air.
) is completed. Such a method is generally called a sedimentation method. After the phosphor (8) is deposited by this sedimentation method, the metal reversal described above is carried out, but the phosphor (3)
If aluminum is directly vapor-deposited on the phosphor (3), a continuous vapor-deposited film will not be formed, so a very thin organic film is formed on the phosphor (3) and then aluminum is vapor-deposited. That is, first, the phosphor surface is moistened with pure water, etc., and most of the phosphor (8) is soaked in the phosphor (1+
), after covering it with a water film (7), spray an organic solvent lacquer such as toluene or ethyl acetate containing acrylic resin as the main component to form a very thin lacquer film (7) on the water film (γ).
8). Next, apply a lacquer coating to unnecessary areas (
8) is removed by pure water (E) flowing out from the nozzle/I/Qυ at a constant pressure, as shown in FIG. 2 (Q). This is because if a lacquer film is formed on the uncoated areas of the phosphor (8), the aluminum film deposited on these areas will blister during the subsequent baking process and peel off from the glass wall. This is done to prevent it. Next, the fluorescent surface is dried using a dehumidifying air or the like, and a graphite film (5) is applied to a predetermined area and dried in the same manner. Finally, aluminum is vapor-deposited to form an aluminum vapor-deposited film (4), and then the organic particles used in forming the fluorescent surface are decomposed and removed by baking at about 400° C. to complete the formation of the fluorescent surface. The tube body with the fluorescent surface completed (
In step 1), the electron gun is further welded and sealed, the inside of the tube body (1) is evacuated, and the electron gun (6) is activated to produce the finished product shown in FIG.

As shown in Figure 6, there are two cathode ray tubes H that emit green light, and tens of thousands to several tens of thousands of cathode ray tubes manufactured by the above method. 100,000 cathode ray tubes are arranged in this way.
The reason why the arrangement ratio of I) is large is to improve the resolution that governs sharpness. The screen size of the light source cathode ray tube is 20φ, 29'.

667 and various types are made, which are suitable for installation locations, indoor use,
They are used for outdoor use and for different purposes. In addition, the arrangement of cathode ray tubes for green, blue, and red light sources is 111 intervals Vi40.
The distance is ~451m, and although this is related to the screen size of the display, a long distance of 70m to 200m is required to obtain good resolution. Further, reducing the arrangement interval of the light source cathode ray tubes contributes to improving the resolution to some extent, but the unit cost of the screen size of the display becomes expensive, and it is not a fundamental solution to improving the resolution. Recently, as a solution to this problem, two cathode ray tubes that emit green light, one cathode ray tube e-barrel that emits blue light, and one cathode ray tube that emits red light become a set of four. Things,
In order to construct the screen of a single light source cathode ray tube with six color tubes in a delta arrangement, a phosphor is coated using a so-called slurry method or a printing method, and each section is colored green, green, etc.
Various devices have been developed that have fluorescent surfaces that emit blue and red colors. This is called cathode ray for multicolor display type light source.
The fourth cathode ray tube arrangement for a giant display using this
Shown in the figure. However, when forming a fluorescent surface of a cathode ray tube for a multicolor display type light source, coating of a phosphor by a precipitation method has not yet been carried out.

The present invention has focused on this point, and by continuously dividing the fluorescent surface of the glass tube body into a plurality of sections and shielding each divided face part to make it independent, the fluorescent light produced by the above-mentioned sedimentation method can be improved. The purpose is to provide something that can be easily applied to the body.

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

The screen size is cylindrical and has a diameter of 29 mm, which is the same as the conventional product, but the fluorescent surface section is divided into six equal intervals of 1206 from the center of the tube axis by a glass plate 6I, as shown in FIG. Moreover, each is completely independent from the other by a glass plate ring for dividing and shielding. In this case, the wall thickness of the glass plate ring is the same as that of the glass tube body (1), here 1.5
Tan f was adopted.

A fluorescent surface is formed on such a light source cathode ray tube by the following procedure.

That is, the inner surface of the glass tube body (1) is cleaned using a hydrofluoric acid aqueous solution, a sodium hydroxide aqueous solution, and pure water in the same manner as in conventional products. Next, a predetermined amount of an aqueous solution of barium acetate as an electrolyte is simultaneously injected into each of the six divided glass tube bodies (1) through injection nozzles. Immediately thereafter, a suspension (62&) of an edge wall light (6a), a front wall light (3b), and a red phosphor (6c) separately dispersed in an aqueous solution of water glass as an adhesive, ( 62b)
, (62c) injecting nozzle/'(61a), (61b),
(61c) and inject at the same time. In this case, the height of the glass plate ring is set to be higher than the total injection amount of the barium acetate aqueous solution and the water glass aqueous solution in which the phosphor is suspended. This is to prevent other suspensions from scattering and mixing. The state is shown in FIG. Thereafter, the tube is allowed to stand for about 15 minutes, and after each phosphor has precipitated, the tube body (1) is slowly tilted to drain each supernatant liquid. Next, the fluorescent surface is dried with dehumidifying air to complete the application of the fluorescent material (8). Next, each fluorescent surface is moistened with pure water, etc., and most of the fluorescent material (8) is covered with a water film (7), and then an organic solvent lacquer containing acrylic resin as the main component is applied to each divided portion. Set up a spray nozzle for each and spray to form a lacquer coating (8) Kl'. After that, the lacquer film (8) in unnecessary areas is removed by the pure water (A) flowing out at a constant pressure from the nozzle IvH at a constant pressure by setting a nozzle /I/ψ0 for each divided part, which is called trimming, and then dehumidification is carried out. Dry the fluorescent surface using a method such as drying and apply a graphite film (5). This graphite film (5) is not applied to the divided shielding glass ring, but only to the electron gun (6) side of the tube wall (Figs. 1 and 2).
(See figure (&), (b) @ (Q)). For aluminum vapor deposition, an evaporation source is provided for each divided portion to form an aluminum vapor deposition film (4). Further, the organic material used in forming the fluorescent surface is decomposed and removed by baking at about 400° C. to complete the formation of the fluorescent surface.

An electron gun (6) dedicated to green, blue and red emitting fluorescent surfaces is welded and sealed to the tube body (1) on which the fluorescent surface has been formed, and then the entire interior of the tube body (1) is sealed. Evacuate and activate each electron gun (6) to obtain a finished product (
(See Figure 1).

Even if the cathode ray tubes for the multicolor display type light source obtained in this way were placed on a huge display device at 40 to 45 cm intervals, as in the past, the optimal viewing distance was within 70 m, which resulted in a significant improvement in resolution. .

In the above embodiment, the screen size was 29φ, but 20φ
, 60φ, etc., the same effect can be obtained by dividing the fluorescent surface portion. In addition to dividing the trench into 6 parts in a delta shape every 120' from the center of the pipe axis, it may also be divided vertically.
Various other applications are possible. When forming a fluorescent surface, it can be applied not only to the sedimentation method but also to internal exposure and external exposure using the slurry method.

As described in detail above, the cathode ray tube for a multicolor display type light source according to the present invention has a method of dividing the fluorescent surface portion of the glass tube body to achieve a higher level of fluorescent light than a conventional cathode ray tube for a monochromatic light source. Not only can the surface forming time and materials be halved, but the improved resolution of a giant display device has the advantage of allowing it to be used in a wide range of applications, including short-distance use, indoor and outdoor advertising, and mobile use.

[Brief explanation of drawings]

Figure 1 is a cross-sectional view showing an example of a conventional cathode ray tube for light sources, and Figure 2 (&) l (b) I (Q) is a cross-sectional or enlarged explanatory view for explaining the manufacturing process of a cathode ray tube for light sources. , Fig. 5 is a partial schematic diagram when a cathode ray tube for a monochrome display type light source is arranged on a huge display, Fig. 4 is a partial schematic diagram when a cathode ray tube for a multicolor display type light source is arranged on a huge display, Fig. 5 6 are explanatory diagrams showing the blue method of the fluorescent surface portion 1 of the cathode ray tube for a multicolor display type light source according to the present invention. (1)...Glass tube body, (2)...Face part,
(3)...Fluorescent material, (6)...Electron gun, ring...Glass plate. In addition, in the figures, the same reference numerals indicate the same or corresponding parts. Agent Masuo Oiwa Figure 1 Figure 2 (b) Figure 3 Figure 4 Figure 5 Procedural amendment (voluntary) 11. J, Li 8. ．． 24゜1-cut T Name and benefits of Akira Nagamiya; representative of the company that calibrates cathode ray tubes for light sources, Hitoshi Katayama, Part 5, ``Detailed Description of the Invention'' column of the specification subject to amendment. 6. Contents of amendment A. Specification: (1) Page 2, line 15, page 7, line 2; "Hydrogen cotton oxide" will be corrected to "hydrogen fluoride." (2) Page 3, line 14 to page 16, page 3, line 1
Starting line 9, page 8, line 2 to line 4 of the same page; "Rakka" is corrected to "lacquer." (3) Page 5, line 16; “Slurry method” should be corrected to “Slurry method.” (4) Page 5, line 20; Correct "display" to "display". (5) Page 8, line 3; Correct "spray" to "spray". (6) Page 9, line 5; Correct "30 meters" to "36 meters". (7) Page 9, line 1 O: Correct "internal exposure" to "internal exposure."that's all

Claims (1)

[Claims] (1) In a cathode ray tube for a light source, in which a glass tube body forming a vacuum envelope has a fluorescent surface on at least one end face portion and an electron gun is sealed at the other end, the other end is formed from the inner glass wall of the face portion. 1. A cathode ray tube for a light source, characterized in that a portion of a predetermined length extending toward the side is divided into a plurality of sections, and each divided face portion is shielded and made independent.