JP3334348B2 - Method for forming light-absorbing material layer on inner surface of panel of color cathode ray tube - Google Patents

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 a panel (glass panel), and a light absorbing layer is provided between adjacent phosphor stripe layers. Forming a carbon stripe layer as a conductive material, or repeatedly forming red, green and blue dot phosphor layers on the inner surface of the panel, filling gaps between the dot phosphors with a carbon layer, The contrast of the displayed image was increased.

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

[0004] Next, as shown in FIG.
The uncured portion of a is removed to form a cured photosensitive resin layer 2 on the panel inner surface 1a.

Next, as shown in FIG. 4C, a carbon slurry 3 is filled on the inner surface 1a of the panel 1 on which the cured photosensitive resin layer 2 of the predetermined pattern is formed, 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 hot air heater. As a result, the moisture 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.

[0006] Next, the carbon layer 7 is gradually moistened with atomized pure water, and when the water is sufficiently distributed in the carbon layer 7, an acid such as periodic acid is applied to the carbon layer.

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

[0008]

By the way, high pressure pure water is sprayed on the carbon layer 7 on the inner surface 1a of the panel 1 to separate and remove the photosensitive resin layer 2 and the carbon layer 7 thereon. There was a possibility that the carbon layer 7 on the inner surface 1a of the panel was partially peeled off. PV as the photosensitive resin layer 2
P-DAS type photosensitive solution (4,4 'to polyvinylpyrrolidone
-Containing diazidostilbene-2,2'-disulfonic acid sodium salt), PVA-
As compared with the case of using an ADC (polyvinyl alcohol-ammonium dichromate) -based photosensitive solution, it is necessary to increase the pressure of pure water sprayed on the carbon layer 7.
In this case, the carbon layer 7 on the panel inner surface 1a is more easily peeled off.

Therefore, conventionally, the temperature at which the carbon slurry 3 is dried is increased, and the drying time is lengthened, so that the adhesive strength of the carbon layer 7 to the panel inner surface 1a is increased. However, if the drying time of the carbon slurry 3 is increased, the temperature of the panel 1 also increases,
The pretreatment (wetting step: step of gradually moistening the carbon layer with atomized pure water) in the step of peeling the carbon layer 7 also becomes long.

In view of the foregoing, the present invention provides a method for forming a light absorbing material layer on the inner surface of a panel of a color cathode ray tube, in which the light absorbing material layer can be firmly adhered onto the inner surface of the panel, An object of the present invention is to propose a method capable of shortening a drying time of a slurry of an absorbent material.

[0011]

SUMMARY OF THE INVENTION According to the present invention, a cured photosensitive resin layer having a predetermined pattern is formed on the inner surface of a panel of a color cathode ray tube, and a light absorbing layer is formed on the inner surface of the panel and on the photosensitive resin layer. A slurry of the substance is applied, 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 predetermined amount of light is applied on the inner surface of the panel. In a method of forming a light absorbing material layer on the inner surface of a panel of a color cathode ray tube, wherein a light absorbing material layer having a pattern is formed, a short wavelength infrared ray having a maximum energy wavelength shorter than 3 μm is initially added to a slurry of the light absorbing material. And then irradiate a long-wave infrared ray having a maximum energy wavelength of about 3 μm to dry the slurry of the light-absorbing substance to obtain a light-absorbing substance layer. Absorbable material This is a method for forming a porous layer.

[0012]

According to the present invention, a slurry of a light-absorbing substance is initially irradiated with short-wave infrared rays having a maximum energy wavelength shorter than 3 μm, and then irradiated with long-wave infrared rays having a maximum energy wavelength of about 3 μm. The light absorbing substance slurry is dried to obtain a light absorbing substance layer.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The entire process of forming a light-absorbing material layer on the inner surface of a panel of a color cathode ray tube is the same as that described with reference to FIG. The redundant description is omitted, and the 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, will be described in detail with reference to FIG.

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

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

In the first half of the drying step of FIG. 1A, when the water 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 step, the long-wavelength infrared heater (not shown) having a heating source temperature of 650 ° C.
While rotating the panel 1 at a low speed, the carbon slurry 3 on the panel inner surface 1a is irradiated with a long-wave infrared ray 6 having a maximum energy wavelength of about 3 μm and dried by heating.
In this case, the long wavelength infrared rays 6 efficiently absorb the water molecules in the carbon slurry 3 and evaporate the water 5 in the carbon slurry 3.

As shown in FIG. 3, it can be seen that the infrared ray having a wavelength of about 3 μm has a considerably high water absorption of 90% or more. However, as described above, the infrared ray having a wavelength of about 3 μm has an extremely shallow penetration depth into water. FIG. 3 shows the wavelength (μm) characteristics of the absorptivity of infrared light 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 in the carbon slurry 3 evaporates and the panel inner surface 1a
A thin (about 1 μm thick) carbon layer 7 is formed between the upper photosensitive resin layers 2 and on the photosensitive resin layers 2.

Thereafter, as described above, the carbon layer 7
Is sprayed with high-pressure pure water to peel off and remove the photosensitive resin layer 2 and the carbon layer 7 thereon. Thus, as described above, a predetermined pattern, that is, a 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 is formed on the inner surface 1a of the panel of the color cathode ray tube, and the light is applied over the inner surface 1a of the panel and over the photosensitive resin layer 2. A slurry 3 of an absorbing substance (carbon) is applied, and the slurry 3 of the light absorbing substance is dried to form a light absorbing substance layer 7, and the photosensitive resin layer 2 and the light absorbing substance layer 7 thereon Is removed to form a light-absorbing material layer 7 in a predetermined pattern on the panel inner surface 1a. First, a short-wavelength infrared ray is irradiated first, and then a long-wavelength infrared ray is irradiated to dry the light-absorbing substance slurry 3 to obtain the light-absorbing substance layer 7. Infrared radiation of light absorbing material (carbon) -3 is absorbed by water molecules deep in the water and efficiently evaporates water, and then long-wave infrared rays are efficiently absorbed by water molecules of the slurry 3 of the light-absorbing substance, and the slurry of the light-absorbing substance is absorbed. 3 can be sufficiently evaporated, whereby the light-absorbing substance layer (carbon layer) 7 can be firmly adhered onto the inner surface 1a of the panel, and the light-absorbing substance slurry 3
Drying time can be shortened. The drying time of the slurry 3 of the light absorbing material was reduced to about half of the conventional drying time. Further, of the drying time, the irradiation time of the short-wavelength and long-wavelength infrared rays was approximately half.

The light absorbing substance layer (carbon layer) 7 is
The green and blue phosphor stripe layers formed on the panel inner surface 1a may be formed in each repeated 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.

In addition to the carbon layer, the light-absorbing substance layer may be a metal vapor-deposited layer of Ni or the like, or a layer obtained by dissolving manganese oxalate in a resist.

[0023]

According to the present invention described above, a hardened 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 layer is formed on the inner surface of the panel and on the photosensitive resin layer. A slurry of the substance is applied, 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 predetermined amount of light is applied on the inner surface of the panel. In a method of forming a light absorbing material layer on the inner surface of a panel of a color cathode ray tube, wherein a light absorbing material layer having a pattern is formed, a short wavelength infrared ray having a maximum energy wavelength shorter than 3 μm is initially added to a slurry of the light absorbing material. And then irradiate a long-wave infrared ray having a maximum energy wavelength of about 3 μm to dry the slurry of the light-absorbing substance to obtain a light-absorbing substance layer. The short-wavelength infrared rays are absorbed by the water molecules deep inside the slurry of the light-absorbing substance to efficiently evaporate the water, and then the long-wavelength infrared rays having a maximum energy wavelength of about 3 μm are converted to the water of the slurry of the light-absorbing substance. The water is efficiently absorbed by the molecules and the water contained in the slurry of the light-absorbing substance can be sufficiently evaporated, whereby the light-absorbing substance layer can be firmly adhered to the panel inner surface, A method for forming a light-absorbing substance layer on the inner surface of a panel of a color cathode-ray tube, which can shorten the drying time of the slurry of the light-absorbing substance, can be obtained.

[Brief description of the drawings]

FIG. 1 is a process diagram showing a drying process according to an embodiment of the present invention. A First half of drying process B Second half of drying process C After drying

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

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

FIG. 4 is a process chart showing steps of a method for forming a light-absorbing substance layer on the inner surface of the panel of the AE color cathode ray tube.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Panel 1a Panel inner surface 2 Photosensitive resin layer 3 Carbon slurry 4 Short wavelength infrared ray 5 Moisture 6 Long wavelength infrared ray 7 Carbon layer 8 Mask 9 Ultraviolet ray

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-61-220243 (JP, A) JP-A-5-332919 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H01J 9/227

Claims (2)

(57) [Claims] 1. A hardened photosensitive resin layer having a predetermined pattern is formed on an inner surface of a panel of a color cathode ray tube, and a slurry of a light-absorbing substance is applied on the inner surface of the panel and on 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 predetermined pattern of light absorption is formed on the inner surface of the panel. In the method of forming a light-absorbing material layer on the inner surface of a panel of a color cathode ray tube in which a light-absorbing material layer is formed, the slurry of the light-absorbing material is irradiated with short-wave infrared light whose initial maximum energy wavelength is shorter than 3 μm. And a panel for a color cathode ray tube, wherein a long-wave infrared ray having a maximum energy wavelength of about 3 μm is irradiated to dry the slurry of the light-absorbing substance to obtain the light-absorbing substance layer. Inside The method of forming the light absorbing material layer on. 2. The method for forming a light-absorbing material layer on the inner surface of a panel of a color cathode ray tube according to claim 1, wherein the light-absorbing material is carbon. .