JPS6095825A - Method of manufacturing fluorescent screen of cathode ray tube - Google Patents

Abstract

PURPOSE:To obtain a color regenerated image with excellent picture quality by appling fluorescent materials for a light pen pickup without blushes to the fluorescent materials of respective colors by the aid of specified dyes used in dyeing. CONSTITUTION:Respective fluorescent materials R, G and B of red, green and blue are arranged and formed with given patterns, for example, retaining given distances in a stripe state, respectively, and given repeat orders, and next, are dyed by the dye DIRECT RED 227 of diazo series. And thereafter, the sensitive slurry 11 which is mixed with the fluorescent materials for a light pen pickup is entirely applied in the panel 10 and the irradiation by ultraviolet rays UV is carried out to achieve its exposure hardening from the outer surface of the panel 10. Next, to the slurry 11, a processing of development is carried out to eliminate unexposed portions by means of pure water. When carrying out such processings, the fluorescent materials D for the light pen pickup is ensurely and selectively adhered between the fluorescent materials R, G and B, and blushes are not caused.

Description

[Detailed Description of the Invention] Industrial Application Field Is the present invention a cathode? The present invention relates to a method for manufacturing a fluorescent surface of a color cathode capillary tube, in which a detection method using light beams, embossments, and quartz tubes is used in a play device at the end and the end of the fluorescent surface of an IM tube.

Background technology and its problems.

In so-called character display display devices that display fine patterns such as characters, symbols, and figures on terminal display devices, two steps are required to obtain high-definition reproduced images.
A scanning mode is used in which each scanning line is sequentially scanned without using interlaced scanning of the field one frame method. This is to avoid misalignment between the scanning lines of each field.

In this case, in order to obtain the number of times the display screen is refreshed in order to obtain the same number of frames as in conventional general interlaced scanning, the scanning speed of the electron beam must be twice that of the conventional one, and the signal This results in drawbacks such as the band being too high and the power of the deflection means being too high. Therefore,
In a character display device as a terminal display device of this type, since many still images are generally handled, the number of times the display screen is refreshed is limited to about 30 to 50 times per second. Therefore, in this type of display and device, 1. If conventional interlaced scanning was used, the flicker of the image would be significant if the flame or light body used in television receivers and tubes was used. For this reason, the cathode ray tube of this type of device has an afterglow time of several milliseconds to several tens of milliseconds! A long afterglow phosphor of j (m) seconds is used. However, when address detection is performed using a light pen as a usage of a character display device, it is necessary to detect the moment when the electron beam passes over the fluorescent surface using the light pen. The afterglow time of the phosphor is required to be as short as possible in order to increase the pickup sensitivity, and this afterglow time is
) A phosphor with a short afterglow on the order of seconds is required.

Note that the afterglow time here refers to the time required for the luminance to decrease to 1/10 of the luminance at the initial stage of light emission.

In this way, this glazed cathode ray tube requires a long afterglow as a phosphor that forms images that can be observed with the naked eye.
Regarding address detection using a light ben, it is necessary to obtain a short detection pulse and a short afterglow is required, and the two are incompatible.

Therefore, normally in this type of cathode ray tube, long afterglow phosphors are used for the green and red phosphors that make up the color phosphor surface, and blue phosphors, which have relatively low visibility, are used. A phosphor with a short afterglow is used. However, in this case, although the previous phosphor has low visibility, it has a short afterglow, so some flickering occurs in the arrow-bound image.

Another example is to use a mixture of a long afterglow phosphor and a short afterglow phosphor of the same color, so that detection by the flashing means is performed only at the level at which both phosphors emit light at the same time. There is something to do. However, in this case, in order to balance the flickering and pickup sensitivity, both 71
．． 'Selecting the bids is difficult, and if a large amount of short afterglow phosphor is used, flickering of the image may be noticeable, or if a small amount is used, the S/N may be poor and the light The pickup sensitivity of the pen has become low -c? i'I
This has the disadvantage that it becomes difficult to detect a real address.

As a solution to these drawbacks, a fluorescent material that emits visible light, such as red, green, and blue light by electron beam bombardment with an afterglow time of, for example, 1 milliJ (m) seconds or less, is applied to the inner surface of the cathode ray tube panel. The luminous body and afterglow time are 101 microns (
It is conceivable to form a fluorescent surface by separately painting a fluorescent material that emits infrared light, for example, for a light pen pickup outside the visible range, by electron beam impact within μ) seconds or less. That is, phosphors that emit red, green, and blue light are formed in a predetermined pattern in the form of stripes or dots on a color phosphor surface, and between these □ phosphors of each color,
A phosphor, for example CdS:Cu, which emits the infrared rays of the detection light for the above-mentioned line pickup may be formed so as to be present on the front side of the cathode ray tube panel. □.

□Object of the Invention The present invention uses the light pen pickup method as described above: a cathode: a fluorescent surface of a ray tube, particularly a strip-shaped,
Alternatively, a cathode ray tube can be used to obtain visible light formed in a desired dot-like pattern.A fluorescent surface is obtained by separately painting phosphors to obtain a luminous flux. Regarding the manufacturing method of the phosphor surface, the phosphor for the Light Ben pickup can be reliably formed into a predetermined pattern without fogging with other red, green, and blue phosphors. A method for manufacturing a fluorescent surface of a cathode ray tube is provided.

1 In other words, as mentioned above, in order to create a phosphor surface in which phosphors for light ben pickup are painted between the phosphors of each color, the phosphors of each color □ of red, green, and blue must be Although conventional optical printing is applied to the inner surface of the panel of the cathode ray tube tube in a sequential manner, the same method cannot be applied to the light pen pick depth. That is, the phosphors i of each color red, green, and 1 are coated with a phosphor slurry of each color on the inner surface of the panel in the process, and the phosphor surface of the final cathode ray tube is coated on this panel. means for determining the electron beam arrival position, which is arranged opposite to the electron beam;
For example, in the cathode ray tube that will ultimately produce the vertature grill, which consists of many slits arranged in parallel, the slits are placed in the same positional relationship as the slits, used as a mask for exposure processing, and then developed. Please find a way to deal with it. However, this method cannot be used to separate the phosphors for obtaining detection light for light ben pickup. This is a photosensitive phosphor slurry made of polyvinyl alcohol (PVA) to which ammonium chromate (ADC) is added, and CdS:Cu, an infrared emitting phosphor, is used as a phosphor. This is because, according to the phosphor slurry used, CdS:Cu exhibits an absorbency to the extent that it becomes light at the wavelength at which the photosensitive material is sensitive to PVA and ADC. FIG. 1 shows the reflectance characteristics of this CdS:Cu phosphor, and FIG. 2 shows the spectral sensitivity of the photosensitive material made of PVA and ADC. FIG. 3 shows the spectral characteristic curve of an ultra-high pressure mercury lamp as an exposure light source for exposing this photosensitive phosphor slurry. The curing process is carried out by light with a wavelength of around 365n771, but the above-mentioned phosphor Cd'S:'Cu has a low reflectance, that is, a high absorption rate for light of this wavelength. Therefore, in this case, exposure processing from the inner surface side of the panel will result in insufficient baking of this phosphor onto the IJ-tube panel. After each phosphor is painted according to the method described above, a photosensitive phosphor slurry for light pen pickup is applied to the entire surface, and then an exposure light is irradiated from the outside of the panel to the entire surface. The phosphor slurry in the areas where the phosphors of each color are not present is exposed and cured.
After that, the slurry is developed and applied onto the areas where each color of phosphor has been painted separately, taking advantage of the fact that almost no exposure hardening occurs due to the presence of each color of phosphor. There is a way to eliminate this.

However, even when this method is used, as mentioned above, the light absorption of the phosphor CdS:Cu is relatively large, so in order to sufficiently expose and cure the phosphor slurry, it is necessary to reduce the actual amount of fog light. need to be turned into a dog. However, since the previously painted phosphors of each color have relatively high light transmittance to ultraviolet rays, these phosphor patterns make it difficult for the phosphor slurry formed thereon to The masking effect was insufficient, and the phosphor slurry on the phosphor of each color was also exposed to harden to a certain extent, and even with the development process, the slurry in this area was not removed sufficiently, and the phosphor slurry on the phosphor of each color was hardened. , a phosphor layer for ride-ben pickup is formed, and so-called "fragrance" occurs.

1. In order to avoid the occurrence of such ``coupling'', after coating each color of phosphor separately, they are treated with a black dye, such as Co1or Index (C, I).
) Direct black (DIRECT BLACK)
22. For example, in Japan, Kayaku - Trade name Kayarasu Fu: Lac-B (4,4'-diamino diphenylamine-2
- Sulfone dye) After dyeing, apply a phosphor slurry for light pickup.
Even by full exposure from the outside of the panel, 1.
Attempts have been made to prevent exposure hardening due to the light-shielding effect of these dyed phosphor layers, and to ensure that the phosphor slurry for the light pen pickup in this area is removed during the development process. It was done.

However, even with this method, it was not possible to reliably eliminate the occurrence of the above-mentioned fogging.

Object of the Invention The present invention provides a fluorescent surface of a cathode ray tube that can effectively avoid the occurrence of the above-mentioned "fogging", particularly a color fluorescent surface of a cathode ray tube that performs address detection using the Wright Ben pickup method. It provides a manufacturing method. : That is, as a result of various experimental considerations, the present inventors found that
The above-mentioned fogging is caused by the above-mentioned black dye DIRE.
It was investigated and clarified that this is due to the fact that CT BLACK 22 exhibits a relatively high transmittance to the light rays used for exposure and curing of I'VA light-sensitive phosphor slurry for light pen picks. That is, the above-mentioned black dye DIR
The transmittance curve of ECT BLACK 22 is the fourth
As shown in curve (1) in the figure, a relatively high transmittance of the light for curing the phosphor slurry for the light pen pickup mentioned above is shown in the vicinity of 365 nm.

Summary of the Invention The present invention is a method for manufacturing a phosphor surface of a cathode ray tube based on the above-mentioned research. The phosphor of each color is coated with a specific dye, namely Co1 or I (C', I).
ndex)Direct L/ツ)”(DIRECT
RED) 227 dye, then applying a photosensitive slurry of light-venn pickup phosphor to the entire inner surface of the cathode ray tube panel, and dyeing the cathode-ray tube panel with a photosensitive slurry of phosphor for light-venn pickup from the outer surface of the panel. Through a process of exposing a photosensitive slurry of phosphor and a process of developing this g-photosensitive slurry, phosphors of each color of red, green, and blue are formed on the target color phosphor surface. A colored fluorescent surface is obtained in which each of the colored fluorescent materials is painted in a desired pattern and a fluorescent material for light pen pickup is coated between the colored fluorescent materials.

EXAMPLE An example of the manufacturing method of the present invention will be explained with reference to FIG. 4 and subsequent figures. In the figure, u(1) indicates a panel of the cathode ray tube body, that is, a face plate. First, as shown in FIG. 4, the red, green, and blue phosphors R, G, and B are arranged in a predetermined pattern, for example, in the form of stripes, with the required spacing and repeated in the required order. Form an array. Each of these phosphors R, G, and B is formed by first optically baking a phosphor of one color, then optically baking a phosphor of another color, and then Optical printing of phosphors of other colors.

That is, first, a photosensitive slurry of phosphor of color 1, IJ-, is applied entirely to the inner surface of panel 0 (1). Then, a means for determining the Kameko beam arrival position, for example, an aperture grill consisting of a large number of slits arranged in parallel, is placed facing this panel 00), for example, facing the fluorescent light inJ in the cathode ray tube to be finally obtained. They are arranged in the same positional relationship as in the cathode ray tube (A), and exposed using this as a mask. That is, the electron beam corresponding to this color in the final cathode ray tube is replaced with light for exposure, and then this phosphor slurry is developed to form the phosphor in the desired pattern on the inner surface of the panel. do. Similar operations are performed for the other two color phosphors.

Next, the phosphors R, G, and B of each color, which were formed in the desired pattern, were coated with a disazo dye DIRE'.
It is dyed with CT RED 2'27, for example Kayaras Light Rose FR (Nippon Kayaku Co., Ltd.). For this dyeing, a -0℃ aqueous solution containing 2.2% of this dye was applied to the panel 0.
0), dyeing is carried out for 1 minute, and then excess dye is washed off with a pure water shower. ' ゛After that, the spring /l/(101 is completely covered with PVA and A
A photosensitive slurry "'-Ql) mixed with a phosphor such as a phosphor that emits infrared rays (CaS:Cu) is applied to a photosensitive material using DC.

And for this slurry: old), spring /I/(10
The outer surface of 1 is irradiated with ultraviolet rays υ■, which causes fog light curing. This cod nine light source can use ultra-high pressure mercury: illusion.・ ・Next □, for this memory (ill,
Perform image processing to remove non-light areas using pure water. In this way, between each of the phosphors R, G and B,
The fluorescent material for the light pen pickup is painted differently.

Therefore, in the same way as when obtaining a normal color phosphor surface, a metal back layer is applied to the entire inner surface of the panel through an intermediate layer (not shown in the figure), and a baking treatment is performed to form each phosphor layer. The desired color fluorescent surface can be obtained by eliminating the binder, that is, the photosensitizer and the organic matter in the intermediate layer.

The color fluorescence mJ obtained in this way is
, 'Fluorescent material for light pickup only between G and B:
D is reliably and selectively formed as a class □, and each firefly □ light body R,'
Brushing over G and B was not allowed.

This means that each phosphor R, G, I3 has I) IItE(,'
When staining is performed with T RED-22rt, the transmittance characteristics are as shown in track #12+ in Figure 4.
A and □'1DcKi exhibit low transmittance near the photosensitive wavelength of 365 nm, which is why each phosphor i (, G, H
, the jealousy rays are blocked and each of these fluorophores 'R
This is because the light pen pickup phosphor slurry coated on G and B is not cured and is easily removed by the subsequent development process.

Effects of the Invention As described above, according to the present invention, it is possible to apply a phosphor for a light pen pickup without fogging the phosphors of each color, so that it is possible to obtain a color reproduced image with excellent image quality. It can be put to practical use and its benefits are dogs.

[Brief explanation of the drawing]

Figure 1 is a reflectance characteristic curve diagram of the phosphor, Figure 2 is a spectral sensitivity curve diagram of PVA photosensitive material, Figure 3 is a spectrum diagram of a light source,
FIG. 4 is a dye transmittance curve diagram, and FIGS. 5 to 7 are process diagrams of an example of the manufacturing method of the present invention. (1 (11 is the cathode ray tube body panel, R, G, B are the red, edge and blue phosphors, D is the phosphor for the light pen pickup. ) Fig. 2 5 Wavelength (ml, 1) Fig. 3 Wavelength (nm) Fig. 4 Wavelength (nm) Fig. 5 Fig. 6 Fig. 7.

Claims (1)

[Claims] The inner surface of the panel of the cathode ray tube body (red 1. The step of painting each of the green and blue fluorescers in a predetermined pattern,
Fluorescent lights of various colors, make your body see eye direct red-2
A straining process of dyeing with 27 dyes, followed by a dyeing process in Kamimachi.
On the inner surface of the polar ray tube panel, there are light bends and pits on multiple sides.
1. The process of applying the fluorescent coating and the repellent slurry; 1. A cathode ray tube comprising the steps of: exposing the area under the photosensitive slurry from the outer surface of the panel; and developing the area below the photosensitive slurry. Fluorescence, manufacturing method of m.