JPH10154463A - Carbon stripe producing method for color picture tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively remove a resist used for producing carbon stripes within a short time, independently of permeability of a peeling agent to a carbon film in the case of producing carbon stripes to be formed between phosphor stripes on a panel inner face of a Trinitron (trademark) type color picture tube. SOLUTION: At the time of removing a resist 2 in stripes, formed under a carbon film 4 on a inner face 18 of a panel, high-pressure development hot water at 25 deg.C and 0.7-3.0MPa is first sprayed to partly peel off the resist 2 from the carbon film 4. Then, a peeling agent, which is a hydrogen peroxide solution of 1% concentration, is injected to permeate the residual resist 2A with the agent. After that, the residual resist 2A is washed out with water and completely removed, to produce carbon stripes 40.

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 carbon stripe of a color cathode ray tube.

[0002]

2. Description of the Related Art For example, in a trinitron type color CRT, a carbon stripe is formed between phosphor stripes in order to improve contrast. The creation of such a carbon stripe is performed in the following procedure. First, after cleaning the inner surface of the panel of the cathode ray tube, a resist is applied to the inner surface and further dried. Next, an aperture grill corresponding to the panel grill is mounted on the panel, and the resist is exposed to UV light using the aperture grill as a mask.

Next, the aperture grill is removed from the CRT panel, and the resist is developed. This development forms a striped resist having a negative pattern for the carbon stripe to be formed. After drying the resist, a carbon film is applied to the inner surface of the CRT panel on which the stripe-shaped resist is formed, and dried. Next, water is applied to the inner surface of the panel on which the carbon film is formed, that is, wetting is performed. As a result, water droplets adhere to the carbon film.

Next, a release agent for removing the striped resist is applied on the carbon film. This release agent
For example, a relatively high-concentration hydrogen peroxide solution of about 7% is used, and a little sulfuric acid is often added thereto.
Then, the stripping agent applied on the carbon film penetrates the carbon film, reaches the stripe-shaped resist, and decomposes the resist. As a result, the striped resist is easily peeled. Next, high pressure developing water (1.5 to 2.0)
MPa (megapascal)) is sprayed to perform water development to remove the resist, and as a result, a carbon stripe is formed.

[0005]

However, in the above prior art, the effect of the stripping agent for decomposing the resist under the carbon film depends on the permeability of the carbon film. For example, there is a difference in the permeability of the release agent due to the properties of carbon itself such as the particle diameter and particle shape of the applied carbon slurry, the thickness of the applied film by the carbon application process, and the degree of drying of the applied surface. When the permeability of the release agent is poor, there is a problem that carbon residual defects are likely to occur.

Further, in order to prevent the occurrence of injection unevenness due to the release agent, water wetting is performed. However, when wetness on the carbon film is poor due to insufficient wetting, unevenness in release unevenness is caused. May occur. Also,
Since it takes time to penetrate the stripping agent, it takes time to decompose the resist, and the index time is long. Further, since the resist is finally stripped off with high-pressure developing water, it is difficult to obtain a clean stripe edge, and a facility for spraying high-pressure developing water is required, which causes a problem of an increase in facility cost. .

Accordingly, an object of the present invention is to remove a resist for forming a carbon stripe effectively in a short time without being influenced by the permeability of a stripping agent into a carbon film.
It is an object of the present invention to provide a method for forming a carbon stripe of a color cathode-ray tube capable of obtaining a clean stripe edge without resist peeling unevenness.

[0008]

According to the present invention, in order to achieve the above object, a stripe-shaped resist is formed on the inner surface of a CRT panel, and then a carbon liquid is applied on the inner surface of the panel, dried, and then dried. By removing the resist under the carbon film, in a carbon stripe creating method of a color cathode ray tube to selectively remove the carbon film to create a striped carbon stripe,
When removing the resist, first apply a high-pressure developer to the inner surface of the panel in a state where a carbon film is formed on the resist,
After removing a certain amount of resist, penetrate the release agent,
Thereafter, the remaining resist is washed away.

In the method of forming a carbon stripe according to the present invention, when removing the striped resist under the carbon film, a high-pressure developer is first applied, and a certain amount of the resist is removed by the pressure. As a result, the carbon film and the resist are partially peeled off, and the peeling agent easily penetrates. Therefore, a stripping agent is then injected to permeate the resist. Thereafter, the remaining resist can be completely removed by washing away the remaining resist. By removing the resist to some extent before the permeation of the stripping agent, the stripping agent can permeate from the missing portion of the carbon film, and a quick and reliable permeation state can be obtained.

Therefore, a low concentration of a release agent, for example, 1%
Sufficient decomposing action can be obtained with a small amount of hydrogen peroxide solution, and reliable resist removal can be performed in a short time without being affected by the permeability of the stripping agent. Also,
Since wetting is not performed as in the related art, there is no occurrence of a carbon peeling defect due to insufficient wetting or a defect of injection mark unevenness. Further, since the final removal of the resist can be performed by washing, a smoother stripe edge can be obtained as compared with the conventional case where the resist is peeled off with a high-pressure developer. In addition, since the high-pressure developer used first only needs to remove a certain amount of resist, for example, the high-pressure developer may be used in a high pressure developer.
A developing solution of about 7 MPa can be used, which can contribute to a reduction in equipment cost.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of a method for producing a carbon stripe of a color cathode ray tube according to the present invention will be described. FIG. 1 is an explanatory diagram showing a flow of a work procedure to which a carbon stripe forming method according to the present invention is applied, and FIG. 2 is a work procedure shown in FIG. FIG. 3 is an explanatory diagram showing a state of a resist and carbon. As shown in FIG. 1, in the carbon stripe forming procedure of this example, first, after cleaning the inner surface of the panel of the cathode ray tube (S1), a resist is applied to the inner surface and dried (S2).

Next, an aperture grill (AG) corresponding to the panel grill is mounted on the panel (S3), and the resist is exposed to UV light using the aperture grill as a mask (S4). Next, the aperture grill is removed from the CRT panel (S5),
The resist is developed (S6). This development forms a striped resist having a negative pattern for the carbon stripe to be formed.
After the resist is dried (S7), a carbon film is applied to the inner surface of the panel and dried (S8). FIG.
(1) shows the step of forming such a carbon film (S8).
5A and 5B are a plan view and a cross-sectional view showing a state where a carbon film 4 is formed on a stripe-shaped resist 2 formed on the inner surface of the panel.

Next, high-pressure developing water is first applied to the inner surface of the panel from above the carbon film 4, and by the pressure,
The resist 2 is removed to some extent (S9). FIG. 3 is an explanatory diagram showing a configuration of an apparatus used in such a high-pressure development process. In this example, for example, 0.7 MPa to 3.0 MP
a, high-pressure development is performed with development hot water at 25 ° C., and development hot water supplied via a valve 10 is supplied to a spray nozzle 16 via a filter 14 while controlling the pressure by a pressure gauge 12. Then, it is sprayed on the inner surface of the panel 18. This operation is performed while, for example, 21 spray nozzles 16 are arranged in a line and the panel 18 is rotated by a rotating mechanism. In this example, one nozzle 1
For No. 6, spraying is performed by supplying 3 liters of developing hot water per minute, and such high-pressure development is performed, for example, for 10 to 20 seconds to remove the resist 2 and the carbon layer 4 as much as possible. The developing hot water was 3.0 MPa.
By the following, the carbon stripe is prevented from peeling.

FIG. 2B shows the resist 2 formed on the inner surface of the panel in the high-pressure development step (S9).
FIGS. 4A and 4B are a plan view and a cross-sectional view illustrating a state in which the carbon film 4 is removed in a stripe shape. As shown in the figure, a considerable amount of the resist 2 is removed by the high-pressure development process, and the remaining resist 2A is removed from the carbon 4 remaining in a stripe shape.
A is attached around A. At this stage, the stripe edges of the carbon 4A are not smooth because the resist 2A is partially adhered.

Next, a stripping agent is injected into and penetrates the remaining resist 2A (S10). FIG. 4 is an explanatory diagram showing a configuration of a release agent injection device used in this example. In the present embodiment, for example, a hydrogen peroxide solution (H ₂ O ₂ ) having a concentration of 1% is used as the release agent, and the release agent supplied from the mixing tank (not shown) via the valve 20 is used as the release agent. The liquid is supplied to the nozzle 26 via the filter 22 and the solenoid valve 24 and injected into the inner surface of the panel 18 rotated by the rotating mechanism. In this example, 400 milliliters of the release agent is injected for 10 seconds per second. FIG. 2C is a cross-sectional view showing a state in which the release agent 28 has been injected into the panel inner surface in such a release agent injection step (S10). At this stage, the stripping agent 28 can be directly supplied to the residual resist 2A, and since the amount of the resist 2A is small, a sufficient decomposition action can be obtained with a low concentration of the stripping agent. Obtainable.

Next, the residual resist 2A decomposed by the release agent 28 is washed away by applying developing water,
And the remaining resist 2A is removed (S11). FIG. 5 is an explanatory diagram showing the configuration of an apparatus used in such a water washing step. In this example, the developing water supplied via the valve 30 is supplied to the nozzle 36 via the filter 32 and the solenoid valve 34, and injected into the inner surface of the panel 18 rotated by the rotating mechanism. FIG. 2D is a plan view and a cross-sectional view showing a state in which the residual resist 2A has been removed and the carbon stripe 40 has been formed by such a watering step (S11).

As described above, a carbon stripe 40 having a smooth stripe edge can be formed.
2). Then, in a subsequent step, a red (R) green (G) blue (B) phosphor is applied to the gap between the carbon stripes 40.

[0018]

As described above, according to the present invention, in the step of forming a carbon stripe on the inner surface of the panel of a color cathode ray tube, when removing the resist formed under the carbon film, first, a high pressure is applied from above the carbon film. After applying a developing solution to remove a certain amount of the resist, a peeling agent was permeated. Thereafter, the remaining resist was washed away with a cleaning solution. Therefore, the stripping agent can penetrate the resist from the missing portion of the carbon film, so that the resist can be quickly and reliably decomposed. Therefore, a sufficient decomposing action can be obtained with a low-concentration stripping agent, and in particular, in a current facility where the concentration of such a chemical tends to be low, the resist can be reliably removed in a short time.

Further, since it is not affected by the permeability of the release agent due to the characteristics and application conditions of carbon, highly reliable work can be realized even when carbon provided by each manufacturer is used. Further, since wetting is not performed as in the conventional case, there is no occurrence of a carbon peeling defect due to insufficient wetting or a defect of injection mark unevenness. Further, since the final removal of the resist can be performed by washing, a smoother stripe edge can be obtained as compared with the conventional case where the resist is peeled off with a high-pressure developer. The high-pressure developer used first only needs to remove a certain amount of resist, so that, for example, a developer of about 0.7 MPa can be used, which can contribute to a reduction in equipment cost.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a flow of a work procedure to which a carbon stripe creating method according to the present invention is applied.

FIG. 2 is an explanatory view showing a state of the resist and carbon from the operation of applying carbon to the operation of washing and removing the resist in the operation procedure shown in FIG. 1;

FIG. 3 is an explanatory diagram showing a configuration of an apparatus used in a high-pressure development step in the work procedure shown in FIG.

FIG. 4 is an explanatory diagram showing a configuration of an apparatus used in a step of injecting a release agent in the operation procedure shown in FIG. 1;

FIG. 5 is an explanatory diagram showing a configuration of an apparatus used in a water washing step in the work procedure shown in FIG. 1;

[Explanation of symbols]

2 ... striped resist, 2A ... residual resist,
4 ... Carbon film, 4A ... Striped carbon,
10, 20, 30 ... valve, 24, 34 ... solenoid valve, 12 ... pressure gauge, 14, 22, 32 ... filter, 16, 26, 36 ... nozzle, 18 ... panel,
28 ... release agent, 40 ... carbon stripe.

Claims (6)

[Claims] After a stripe-shaped resist is formed on the inner surface of a CRT panel, a carbon liquid is applied onto the inner surface of the panel and dried, and then the carbon film is removed by removing the resist under the carbon film. In a method of forming a carbon stripe of a color cathode-ray tube in which stripes are selectively removed to form a stripe-like carbon stripe, a high-pressure developer is first applied to the inner surface of the panel where the carbon film is formed on the resist when removing the resist. ,
After removing a certain amount of resist, penetrate the release agent,
Thereafter, the remaining resist is washed away, and a method for producing a carbon stripe for a color cathode ray tube. 2. The method according to claim 1, wherein a low-concentration release agent is used as the release agent. 3. The method according to claim 2, wherein the release agent is a solution of a hydrogen peroxide solution having a concentration of about 1%. 4. The high-pressure developer according to claim 1, wherein said high-pressure developer is 0.7 MPa to 3.0 MPa.
4. The method for producing carbon stripes of a color cathode ray tube according to claim 1, wherein the developing water is 0 MPa. 5. The operation of washing away the remaining resist,
The method for producing a carbon stripe of a color cathode ray tube according to any one of claims 1 to 4, wherein the step is a step of spraying water on an inner surface of the panel. 6. The striped resist, after cleaning the inside surface of the panel of the cathode ray tube, applying a resist on the inside surface and drying the resist, and then mounting an aperture grill corresponding to the resist on the panel. 2. The color cathode ray tube according to claim 1, wherein the resist is exposed to UV light using an aperture grill as a mask, and then the aperture grill is removed from a cathode ray tube panel and the resist is developed to form the color cathode ray tube. How to make a carbon stripe.