JPH0864132A - Method for forming light absorbing material layer on inner surface of panel of color cathode ray tube - Google Patents

Abstract

(57) [Abstract] [Purpose] In a method of forming a light-absorbing substance layer on the inner surface of a panel of a color cathode ray tube, the light-absorbing substance layer can be firmly adhered to the inner surface of the panel, The present invention is intended to propose a method capable of shortening the drying time of the slurry. [Structure] A cured photosensitive resin layer 2 having a predetermined pattern is formed on a panel inner surface 1a of a color cathode ray tube, and a slurry 3 of a light absorbing substance is applied over the panel inner surface 1a and the photosensitive resin layer 2. And the slurry 3 of the light absorbing material
Is dried to form the light-absorbing substance layer 3, and the photosensitive resin layer 2 is formed.
And removing the light-absorbing substance layer 7 thereon to form the light-absorbing substance layer 7 having a predetermined pattern on the inner face 1a of the panel. Forming the light-absorbing substance layer on the inner face of the panel of the color cathode ray tube. In the method, in the slurry 3 of the light absorbing material,
The light-absorbing substance layer 7 is obtained by first irradiating short-wavelength infrared rays and then irradiating long-wavelength infrared rays to dry the slurry 3 of the light-absorbing substance. Carbon is used as the light absorbing substance.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for forming a light absorbing material layer on the inner surface of a panel of a color cathode ray tube.

[0002]

2. Description of the Related Art In a conventional color cathode ray tube, red, green and blue phosphor stripe layers are repeatedly formed on the inner surface of the panel (glass panel), and light absorption is performed in the gaps between adjacent phosphor stripe layers. Forming a stripe layer of carbon as a conductive substance, or red, green and blue dot-shaped phosphor layer is repeatedly formed on the inner surface of the panel, the gap between each dot-shaped phosphor is filled with a carbon layer, The contrast of the displayed image is increased.

Next, with reference to FIG. 4, a conventional example of a method of forming a light absorbing material layer on the inner surface of the panel of the color cathode ray tube will be described. As shown in FIG. 4A, a photosensitive resin layer 2a is formed on the inner surface of the panel 1, that is, the inner surface 1a of the panel, and a mask 8 having a pattern of a constant width is arranged on the photosensitive resin layer 2a at predetermined intervals.
Then, the photosensitive resin layer 2a is irradiated with ultraviolet rays 9 through the mask 8 to be cured.

Next, as shown in FIG. 4B, the photosensitive resin layer 2
The uncured portion of a is removed to form the cured photosensitive resin layer 2 having a predetermined pattern on the panel inner surface 1a.

Next, as shown in FIG. 4C, the inner surface 1a of the panel 1 on which the cured photosensitive resin layer 2 having a predetermined pattern is formed is filled with the carbon slurry 3, and the panel 1 is shaken off. A coating film of carbon slurry 3 is formed on 1a. Then, the carbon slurry 3 is dried using a long wavelength infrared heater and a warm air heater. As a result, the water content of the carbon slurry 3 evaporates, and a thin carbon layer 7 is formed between the photosensitive resin layers 2 on the panel inner surface 1a and on the photosensitive resin layer 2 as shown in FIG. 4D.

Next, the carbon layer 7 is gradually moistened with mist-like pure water, and when the carbon layer 7 is sufficiently filled with water, an acid such as periodic acid is soaked in the carbon layer.

Next, high-pressure pure water is sprayed on the carbon layer 7 to peel off the photosensitive resin layer 2 and the carbon layer 7 thereon to remove it. As a result, as shown in FIG. 4E, a predetermined pattern, that is, a striped carbon layer 7 having a constant interval and a constant width is formed on the panel inner surface 1a.

[0008]

By the way, in the process of spraying high pressure pure water onto the carbon layer 7 on the inner surface 1a of the panel 1 to remove and remove the photosensitive resin layer 2 and the carbon layer 7 thereon, There was a possibility that the carbon layer 7 on the panel inner surface 1a was partially peeled off. PV as the photosensitive resin layer 2
P-DAS type photosensitive solution (4,4 'in polyvinylpyrrolidone
-Diazidostilbene-2,2'-disulfonic acid sodium salt) is used, PVA-
Since it is necessary to increase the pressure of pure water sprayed on the carbon layer 7 as compared with the case of using an ADC (polyvinyl alcohol-ammonium dichromate) type photosensitive solution,
In this case, the carbon layer 7 on the panel inner surface 1a becomes even easier to peel off.

Therefore, conventionally, the temperature after the carbon slurry 3 has been dried is increased and the drying time is lengthened to increase the adhesive strength of the carbon layer 7 to the panel inner surface 1a. However, if the drying time of the carbon slurry 3 is lengthened, the temperature of the panel 1 also rises,
The pretreatment of the peeling step of the carbon layer 7 (wetting step: step of gradually moistening the carbon layer with mist-like pure water) also becomes long.

In view of the above point, the present invention is a method of forming a light absorbing material layer on the panel inner surface of a color cathode ray tube, in which the light absorbing material layer can be firmly adhered to the panel inner surface and It is intended to propose a method capable of shortening the drying time of the slurry of the absorbent material.

[0011]

According to the present invention, a cured photosensitive resin layer 2 having a predetermined pattern is formed on an inner surface 1a of a panel of a color cathode ray tube, and the inner surface 1a of the panel and the photosensitive resin layer 2 are covered. And apply slurry 3 of light absorbing material,
The light absorbing substance slurry 3 is dried to form a light absorbing substance layer 7, the photosensitive resin layer 2 and the light absorbing substance layer 7 thereon are removed, and a predetermined pattern is formed on the panel inner surface 1a. In a method of forming a light-absorbing substance layer on the inner surface of a panel of a color cathode ray tube, which is configured to form the light-absorbing substance layer 7,
The slurry 3 of the light absorbing substance is first irradiated with infrared rays of short wavelength and then with the infrared rays of long wavelength, and the slurry 3 of the light absorbing substance is dried to obtain the light absorbing substance layer 7. It was done. As the light absorbing substance, for example, carbon is used.

[0012]

According to the present invention, the light absorbing substance slurry 3 applied over the panel inner surface 1a and the photosensitive resin layer 2 is first irradiated with short wavelength infrared rays, and then with long wavelength infrared rays. And the slurry 3 of the light absorbing substance is dried.

[0013]

EXAMPLE The entire steps of the method of forming the light absorbing material layer on the inner surface of the panel of the color cathode ray tube are the same as those described in the prior art with reference to FIG. 4, except for the drying step. Overlapping description is omitted, and here, with reference to FIG. 1, a detailed description will be given of a drying step which is a part of the method of forming the light absorbing material layer on the inner surface of the panel of the color cathode ray tube of the embodiment.

As described in the step of FIG. 4C, the panel 1 (glass panel) 1 is filled with the carbon slurry 3 on the panel inner surface 1a on which the cured photosensitive resin layer 2 having a predetermined pattern is formed, and the panel 1 is shaken off. As a result, a coating film of carbon slurry 3 (with a thickness of about 15
μm to about 30 μm) is formed. Then, as shown in FIG. 1A, in the first half of the drying process, the heating source temperature is 2000 ° C.
Using a short wavelength infrared heater (not shown) of C, while rotating the panel 1 at a low speed, the carbon slurry 3 on the inner surface 1a of the panel is irradiated with short wavelength infrared rays 4 having a maximum energy wavelength of about 1.3 μm. Heat dry. In this case, the short wavelength infrared rays are sufficiently absorbed by the water molecules in the carbon slurry 3 from a shallow portion to a deep portion to evaporate the water 5 in the carbon slurry 3.

As shown in FIG. 2, infrared rays having a wavelength shorter than 3 μm have a deep penetration depth of about 120 μm into water. However, infrared rays with a wavelength of about 3 μm
It can be seen that the penetration depth for water is extremely shallow. Note that FIG. 2 shows the wavelength (μm) characteristics of the penetration depth (μm) of infrared rays in water having a thickness of 2 to 5 mm.

In the first half of the drying step of FIG. 1A, when the water content in the carbon slurry 3 evaporates to some extent and the coating film of the carbon slurry 3 becomes thin (the thickness is about 5 μm to about 15 μm).
m), as shown in FIG. 1B, in the latter half of the drying process, a long wavelength infrared heater (not shown) having a heating source temperature of 650 ° C. is used to rotate the panel 1 at a low speed and The carbon slurry 3 is irradiated with short wavelength infrared rays 4 having a maximum energy wavelength of about 3 μm to heat and dry. In this case, the long-wavelength infrared rays are efficiently absorbed by the water molecules in the carbon slurry 3, and the carbon slurry 3
The water content 5 is evaporated.

As shown in FIG. 3, it can be seen that infrared rays having a wavelength of about 3 μm have a considerably high absorption rate for water of 90% or more. However, as described above, infrared rays having a wavelength of about 3 μm have an extremely shallow penetration depth in water. Note that FIG. 3 shows the wavelength (μm) characteristics of the absorption rate of infrared rays with respect to water when the film thickness ε of water is 0.01, 0.02, 0.03, and 0.05 mm, respectively.

As a result, as shown in FIG. 1C, almost all of the water content of the carbon slurry 3 evaporates, and the panel inner surface 1a is evaporated.
A thin carbon layer 7 (having a thickness of about 1 μm) is formed between the upper photosensitive resin layers 2 and on the photosensitive resin layer 2.

After that, as described above, the carbon layer 7 is formed.
High-pressure pure water is sprayed on to remove the photosensitive resin layer 2 and the carbon layer 7 thereon by peeling. By doing so, as described above, the predetermined pattern, that is, the stripe-shaped carbon layer 7 having a constant interval and a constant width is formed on the panel inner surface 1a (FIG. 4E).

According to the above-described embodiment, the cured photosensitive resin layer 2 having a predetermined pattern is formed on the panel inner surface 1a of the color cathode ray tube, and the light is spread over the panel inner surface 1a and the photosensitive resin layer 2. The slurry 3 of the absorptive substance (carbon) is applied, and the slurry 3 of the absorptive substance is dried to form the absorptive substance layer 7, and the photosensitive resin layer 2 and the absorptive substance layer 7 thereon. In the method of forming a light-absorbing substance layer on the inner surface of the panel of a color cathode ray tube in which the light-absorbing substance layer 7 having a predetermined pattern is formed on the inner surface 1a of the panel. First, the short-wavelength infrared rays were first irradiated, and then the long-wavelength infrared rays were irradiated to dry the slurry 3 of the light-absorbing substance to obtain the light-absorbing substance layer 7. Infrared is a slur of light-absorbing material (carbon). -It is absorbed by water molecules deep inside 3 to evaporate water efficiently, and then long-wavelength infrared rays are efficiently absorbed by the water molecules of slurry 3 of light absorbing material, resulting in slurry of light absorbing material. The water contained in 3 can be sufficiently evaporated, whereby the light absorbing substance layer (carbon layer) 7 can be firmly adhered to the panel inner surface 1a, and the slurry of the light absorbing substance can be formed. Three
The drying time can be shortened. The drying time of the slurry 3 of the light absorbing substance was about half that of the conventional drying. Of the drying time, the irradiation time of infrared rays of short wavelength and long wavelength was about half.

The light absorbing material layer (carbon layer) 7 is
The green and blue phosphor stripe layers formed on the panel inner surface 1a may be formed in each repeating gap, or the red, green and blue dot-shaped phosphor layers formed on the panel inner surface 1a may be formed. It may be formed so as to fill the gap between the repeated dot-shaped phosphors.

Further, as the light absorbing substance layer, in addition to the carbon layer, a metal vapor deposition layer of Ni or the like, a layer of manganese oxalate dissolved in a resist, or the like can be used.

[0023]

According to the present invention described above, a cured photosensitive resin layer having a predetermined pattern is formed on the inner surface of the panel of the color cathode ray tube, and the light absorbing property is provided over the inner surface of the panel and the photosensitive resin layer. Apply the slurry of the substance, dry the slurry of the light-absorbing substance to form the light-absorbing substance layer, remove the photosensitive resin layer and the light-absorbing substance layer on the photosensitive resin layer, and set it on the inner surface of the panel. In the method of forming a light-absorbing substance layer on the panel inner surface of a color cathode-ray tube so as to form a light-absorbing substance layer of a pattern, the slurry of the light-absorbing substance is initially irradiated with infrared rays of short wavelength, and then By irradiating long-wavelength infrared rays and drying the slurry of the light-absorbing substance so as to obtain the light-absorbing substance layer, the short-wavelength infrared rays initially become molecules of water deep inside the slurry of the light-absorbing substance. Water is absorbed and water is efficiently evaporated. Then, the short-wave infrared rays are efficiently absorbed by the water molecules of the slurry of the light absorbing material, and the water contained in the slurry of the light absorbing material can be sufficiently evaporated, which results in the light absorption. The strong substance layer can be firmly adhered to the inner surface of the panel, and the drying time of the slurry of the light absorbing substance can be shortened.

[Brief description of drawings]

FIG. 1 is a process diagram showing a drying process according to an embodiment of the present invention: A first half of a drying process B second half of a drying process C after drying

FIG. 2 is a characteristic curve diagram showing wavelength characteristics of penetration depth of infrared rays into water.

FIG. 3 is a characteristic curve diagram showing a water film thickness and an infrared absorption spectrum.

4A to 4E are process diagrams showing steps of a method for forming a light-absorbing substance layer on an inner surface of a panel of a color cathode ray tube.

[Explanation of symbols]

 1 Panel 1a Panel Inner Surface 2 Photosensitive Resin Layer 3 Carbon Slurry 4 Short Wave Infrared 5 Moisture 6 Long Wave Infrared 7 Carbon Layer 8 Mask 9 UV

Claims (2)

[Claims] 1. A colored photosensitive resin layer having a predetermined pattern is formed on the inner surface of the panel of the color cathode ray tube, and a slurry of a light absorbing substance is applied over the inner surface of the panel and the photosensitive resin layer. The slurry of the light-absorbing substance is dried to form a light-absorbing substance layer, the photosensitive resin layer and the light-absorbing substance layer thereon are removed, and a light-absorbing substance having a predetermined pattern is formed on the inner surface of the panel. In the method for forming a light-absorbing substance layer on the panel inner surface of a color cathode-ray tube so as to form a light-sensitive substance layer, the slurry of the light-absorbing substance is first irradiated with short-wave infrared rays, and then with a long-wavelength infrared ray. A method of forming a light-absorbing substance layer on the inner surface of a panel of a color cathode ray tube, which comprises irradiating infrared rays and drying the slurry of the light-absorbing substance to obtain the light-absorbing substance layer. 2. The method for forming a light-absorbing substance layer on the panel inner surface of the color cathode ray tube according to claim 1, wherein the light-absorbing substance is carbon. .