JPH0831306B2 - High-definition cathode ray tube device manufacturing method - Google Patents

Description

The present invention relates to a method for producing a high-definition cathode ray tube device suitable for application to a cathode ray tube such as a terminal display device, particularly an ultra-high-definition cathode ray tube device.

[Outline of the invention] The present invention is a cathode-ray tube front panel coated with a fluorescent substance having a substrate temperature of 75 to 100 ° C., in particular, a solution of 16 to 20% by weight of silicon tetrachloride in an amount of 0.13 to 0.26 ml. With a spray flow rate of / sec, the distance between the spray ejection part and the front panel is maintained at 10 to 20 cm, and spray is applied at a coating amount of 400 to 500 cc / m ² , and the surface roughness of the front panel is R _max.
By applying the glare prevention treatment of 0.3 μm and Rz 0.2 μm, the image quality is not impaired in the ultra high definition tube.
Moreover, it is possible to obtain a high-definition cathode ray tube device that effectively prevents glare or glare due to reflected light.

[Conventional technology]

In a terminal display device of a computer,
It is often used in a relatively bright environment, and there is an increasing demand for providing so-called antiglare means for preventing glare caused by reflected light of outside light. Particularly when an ultra high definition tube is used as the cathode ray tube, it is required to obtain a reliable antiglare effect without lowering the original resolution of the ultra high definition tube.

As a conventional antiglare method, for example, a method in which a panel having a so-called metal multilayer antireflection film formed on the front surface of a cathode ray tube is attached is proposed. However, in this case, the cost becomes extremely high, and it is not suitable for a general-purpose ultra-high definition cathode ray tube.

Further, as another method, there is a method of directly forming irregularities by chemical etching on the front panel of the cathode ray tube to cause scattering of external light and obtain an antiglare effect. In this case, although there is an advantage that it can be formed at low cost, there is a problem in resolution and sharpness, it is unsuitable for an ultra-high definition tube, and the unevenness of the panel surface and the interference of light with the fluorescent surface periodic structure are also caused. There is a problem that I am not fully satisfied.

Further, as another method, various methods such as mechanically forming irregularities on the front panel of the cathode ray tube, or arranging a mesh, arranging a Venetian blind or Fresnel lens, etc. are adopted. In the case of the ultra high definition tube, there is a problem that the resolution or the sharpness is deteriorated.

In addition, various cathode ray tubes have been proposed in which various anti-glare treatments are performed to form various coatings on the surface of the front panel of the cathode ray tube body to obtain an antiglare effect. Examples of these cathode ray tubes and their non-glare processing methods include, for example, JP-A-60-
142685, JP-A-60-109134, JP-A-60-129778 and the like. However, when any of these is applied to an ultra high definition cathode ray tube, there is a fear that the high definition of the reproduced image itself may be impaired.

[Problems to be solved by the invention]

INDUSTRIAL APPLICABILITY The present invention performs so-called non-glare processing which is excellent in resolution and sharpness without damaging the reproduced image to be observed even when applied to a super high definition type cathode ray tube, and which can effectively obtain an antiglare effect. A method of manufacturing a cathode ray tube device is provided.

A high-definition tube is an electron beam corresponding to each color, for example, red, green, and blue, such as a shadow mask provided on the fluorescent surface of a cathode ray tube, or an aperture grill, and the fluorescence of each color on the fluorescent surface. In the color selection means for landing on the phosphors of the corresponding color of the body triplet, the pitch of the beam transmission aperture is configured to be 0.3 mm or less, and the ultra high definition tube is the electron beam. The pitch of the transmission openings is 0.25 mm or less.

[Means for solving problems]

In the present invention, the front panel of the high-definition cathode ray tube body is heated to 75 to 100 ° C., and silicon tetrachloride is added to 16
A solution containing ~ 26% by weight with a spray flow rate of 0.13 ~ 0.26 ml / sec, and the space between the spray nozzle and the front panel is 10
Hold at -20 cm and spray with a coating amount of 400-500 cc / m ² to obtain surface roughness Rmax 0.3 μm, Rz 0.2 μm (where Rm
ax and Rz represent the surface roughness according to the JIS standard.The maximum unevenness difference in a certain length range is Rmax, and the average unevenness difference is
Rz. ) Is applied to prevent glare.

[Action]

As described above, by specifying the spray material and further specifying the spray conditions, in other words, by specifying the coating film thickness and its surface roughness, it is possible to obtain high resolution and sharpness without damaging the reproduced image even in an ultra high definition tube. It has been confirmed that a cathode ray tube having the above-mentioned properties and capable of reliably obtaining the antiglare effect, that is, the non-glare effect can be obtained.

〔Example〕

A non-glare treatment is applied to the completed cathode ray tube by the following procedure on the front panel having the fluorescent surface.
First, clean the surface of the front panel of the cathode ray tube body by 75 to 10
A preheat treatment is performed at 0 ° C. for 15 minutes, for example. This heating is performed in a heating furnace, and the cathode ray tube body is taken out of the heating furnace and then sprayed with a silicon tetrachloride solution. In this case, the spraying time is about 2 to 3 minutes. At this time, the temperature of the cathode ray tube body panel is actually lowered by about 20 ° C during the spraying, but if the panel is kept at about 75 ° C or more during the spraying process. Good. Then, this spray uses, for example, 0.13 to 0.26 ml of an alcohol solution of silica coat CNG-005 (trade name of Colcoat Co., Ltd.) containing 16 to 20% by weight of silicon tetrachloride.
With a spray flow rate of, for example, 0.26 ml / sec, the distance between the spray ejection portion, that is, the nozzle and the surface to be sprayed of the cathode ray tube, that is, the front panel is 10 to 20 cm, preferably 15
Spray at intervals of ~ 18 cm, and spray on the surface of the front panel so that the applied amount is 400-500 cc / m ² .

After that, baking treatment is performed at 150 ° C. to 250 ° C. for 30 minutes, for example, 200 ° C. for 30 minutes, and the surface roughness Rmax0.
A coating film of 3 μm and Rz 0.2 μm is formed.

The characteristics of the cathode ray tube device thus obtained were that the number of resolutions was 60 / cm or more. With this number of resolutions
A bar chart is attached to the inner surface of the front panel of the cathode ray tube body to measure the maximum number that can be observed from a distance of 30 cm from the outside of the panel.This resolution number is glaring and has a close relationship with so-called glaring. And this is for example
It can be said that the surface roughness becomes almost inconspicuous when it exceeds 60 lines / cm.

Further, in the high definition cathode ray tube device obtained by the method of the present invention, the sharpness of the image was 3 or less. Incidentally, in the cathode ray tube used in the device of the present invention, the sharpness before the non-glare treatment was set to 1. This sharpness is obtained by the method described below, that is, this sharpness is
As shown in FIGS. 1 and 2, the luminance distributions of the electron beam spots of the cathode ray tube device obtained by the method of the present invention and the cathode ray tube used for the cathode ray tube before non-glare treatment were measured. It is the calculated value. That is, when each cathode ray tube is irradiated with one electron beam, a color selection means provided inside the cathode ray tube tube with respect to the fluorescent surface, for example, an aperture grill having a slit-shaped electron beam transmitting opening extending in the vertical direction. In this case, a plurality of bright lines occur, which results in a plurality of high brightness portions a ₁ a ₂ ... Shown in FIGS. 1 and 2, but in this case, the level between the high brightness peak portions a ₁ a ₂ A difference ΔL between L and the brightness level L _{G of the} portion where the electron beam spot does not exist is normalized by a similar difference ΔLn between the levels L and L _G in FIG. 2 which is not subjected to the non-glare process, that is, ΔL / Δ
It is shown by the value of Ln. In the cathode ray tube device obtained by the device of the present invention, the increase in the level L was suppressed to a very low level despite the non-glare treatment. FIG. 3 shows the luminance distribution of a cathode ray tube similar to that shown in FIGS. 1 and 2, which was subjected to a non-glare treatment by chemical edging. In this case, the sharpness was about “6”.

Further, regarding the non-glare, that is, the antiglare effect in the high definition cathode ray tube device according to the present invention, the gloss value (unit according to JIS standard indicating the glossiness) is 50 to 70, which is a value that provides an excellent antiglare effect. I understand.

As described above, in the method of the present invention, a solution of silicon tetrachloride is sprayed for glare treatment.
The front panel heating temperature for the spray is 75
℃ ~ 100 ℃ is selected, if the temperature is less than 75 ℃, the sprayed coating will dry slowly, so-called flow down occurs and it is difficult to form a uniform coating, and at temperatures higher than 100 ℃, dry This is because it was acknowledged that there is a drawback that the coating area does not generate so-called craters and the adhesion area is reduced.

Also, select the flow rate of 0.13 to 0.26 ml / sec,
It was confirmed that if the amount was less than 0.13 ml / sec, the coating amount was too small to achieve uniform coating, and that if the flow rate was greater than 0.26 ml / sec, the sharpness decreased.

The spray distance is 10 to 20 cm, preferably 15 to 18 cm.
It was admitted that if the distance is too small, the spray will be non-uniform and liquid will flow down, and if the distance is too large, the spray coating film will be insufficient and become industrially unfavorable. It depends. Further to selecting the coating amount 400~500cc / m ² is gloss value is small is less than 400 cc / m ^2, due to the fact that admitted that gloss value becomes too large exceeds 500 cc / m ^2.

〔The invention's effect〕

As described above, since the method of the present invention employs a method of performing glare prevention treatment by spraying a solution of silicon tetrachloride, this treatment can be performed on a completed cathode ray tube, and thus is extremely simple work. You can do it. In addition, the glare prevention process with excellent resolution and sharpness can be performed by specifying each condition of the glare prevention process. That is, since the antiglare effect can be achieved, the profit is large when it is put to practical use.

[Brief description of drawings]

FIG. 1 shows the luminance distribution in the high-definition cathode ray tube device obtained by the present invention, and FIGS. 2 and 3 show the luminance distribution before the glare prevention treatment and before the glare prevention treatment by chemical etching. .

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Hideo Suzuki Hideo Suzuki, 6-735 Kita-Shinagawa, Shinagawa-ku, Tokyo Inside Sony Corporation (56) References JP-A-60-142685 (JP, A)

Claims (1)

[Claims] 1. A front panel of a cathode ray tube body, comprising the panel.
It is heated to 75 to 100 ° C, and a 16 to 20 wt% solution of silicon tetrachloride is sprayed at a spray flow rate of 0.13 to 0.26 ml / sec, keeping the distance between the spray ejection part and the front panel at 10 to 20 cm. A high-definition cathode ray tube device characterized in that the front panel surface is sprayed with a coating amount of 400 to 500 cc / m ² and subjected to glare prevention treatment so that the surface roughness becomes R _max ≦ 0.3 μm, Rz ≦ 0.2 μm. Manufacturing method.