JPS63294647A - Method for forming phosphor stripe - Google Patents

Abstract

PURPOSE:To prevent any stripe from being subjected to a phenomenon like separation by arranging a glass panel in such a manner that developer can flow, in the shape of a lamina flow, along a phosphor stripe to be formed, in the case of atomization of developer. CONSTITUTION:A glass panel 1 is securely supported by a carrier 20 and the developer atomized on the inner surface of the glass panel 1 flows in the shape of a lamina flow along a phosphor stripe to be formed by forming the glass panel 1 in the prescribed form of arrangement. The glass panel 1 is so arranged as to get its inner face oriented downward and put in positional relationship to be orthogonal to a vertical line and spray nozzles 21 are arranged directly below the glass panel 1 to blow the developer straightly upward. Thus, bending action applied to the stripe caused by water stream is almost perfectly eliminated so that the phenomenon of separation of stripe hardly occurs, thus the quality and yield of manufacture of phosphor surface can be enhanced.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a method for forming phosphor stripes used in color picture tubes, etc., and particularly aims to improve the developing process. It is something.

[Prior Art] FIG. 4 is a diagram showing the manufacturing process of a typical color picture tube fluorescent surface. Moreover, FIGS. 5, 6, and 7 are cross-sectional views sequentially showing the state up to the formation of phosphor stripes on the inner surface of the glass panel. First, with reference to these figures, the steps up to the formation of phosphor stripes on the inner surface of the glass panel will be explained.

The glass panel 1 forming the fluorescent surface first undergoes a cleaning process. In this cleaning step, the inner surface of the glass panel 1 is cleaned using caustic soda, hydrofluoric acid, and pure water.

Next, in a step called precoating, an extremely thin aqueous solution of 0.02% polyvinyl alcohol, for example, is sprayed onto the inner surface of the glass panel 1.

Thereafter, this glass panel 1 is dried in a drying process to form a precoat film 2 on its inner surface.

Next, the glass panel 1 undergoes a phosphor slurry application process. There, a phosphor slurry comprising a green phosphor dispersed in an aqueous solution based on a photosensitive binder, e.g. polyvinyl alcohol and ammonium dichromate, is injected onto the inner surface of the glass panel 1. Then, after applying the phosphor slurry uniformly by a spin coating method, it is dried in a drying step to form a slurry film 3.

If the formed slurry 113 has no defects, then the glass panel 1 is moved to an exposure process. In this exposure step, the phosphor slurry film 3 is exposed to light by a predetermined exposure device through a shadow mask serving as a color selection electrode to form a latent image.

As a result, the glass panel 1 undergoes a developing process. Here, a developer is sprayed onto the phosphor slurry film 3 to form desired phosphor stripes 4.

That is, the unexposed portions of the phosphor slurry film 3 are washed away by the spraying of the MS liquid, and only the exposed portions remain as the phosphor stripes 4. A green phosphor stripe 4 is thus formed on the inner surface of the glass panel 1. Note that if there is a defect in the phosphor slurry film 3, development processing is performed without performing exposure processing. In that case, since all of the phosphor slurry 113 is unexposed, it is all removed by the developer spray.

The term "phosphor stripe" as used in this specification means not only a continuous stripe but also a stripe consisting of a large number of dots.

After the formation of the green phosphor stripes 4 is completed as described above, the stomach and red phosphors are similarly processed from the slurry application step to the development step.

Finally, as shown in FIG. 7, s! is placed at a position corresponding to the opening of the shadow mask! ! Light stripe 4, blue phosphor stripe 5 and red phosphor stripe 6
are successively formed, and the deposition of the phosphor is completed.

FIG. 8 is a diagram schematically showing an apparatus for developing the phosphor slurry 113 formed on the inner surface of the glass panel 1. As shown in FIG.

The glass panel 1 is firmly held by a carrier 8 which is rotationally driven by a motor 7. The inclination angle θ between the rotation axis 9 of the carrier 8 and the vertical line is, for example, about 75°.

Pure water used as a developer is stored in a pure water tank 10 and is controlled to have a constant temperature of 111 [, for example, 40°C. The pure water that is suctioned and pressurized by the pump 11 is sprayed from the spray nozzle 12 onto the phosphor slurry film 3 formed on the inner surface of the glass panel 1 .

The spray from the spray nozzle 12 is carried out for a certain period of time and under a certain water pressure, and the amount of spray is, for example, about 200 ml.
It is 0cc. This spray development is repeated two to three times. The pure water spray washes away the unexposed portions of the phosphor slurry film.

The pure water that has washed away the unexposed portions of the phosphor slurry film in this way is collected in a collection tank 14 via a saucer 13. After that, the pure water collected in the collection tank 14 is usually
A pump 15 sends it to a centrifuge.

When the above-described development process is completed, a large number of phosphor stripes 4.5.6 are formed in parallel on the inner surface of the glass panel 1, as shown in FIG.

[Problems to be Solved by the Invention] However, the conventional method for forming phosphor stripes has the following problems. This problem exists particularly in the development process. That is, each development step in the process of forming a three-color phosphor usually requires two to three apparatuses as shown in FIG. It is organized vertically in i locations. Therefore, if the phosphor slurry film of each color is repeatedly developed two or three times, the adhesion between the phosphor and the glass panel due to the photosensitive binder decreases, and the phosphor becomes localized, especially at the outermost periphery of the effective screen. A phenomenon in which the light stripe peels off from the glass surface may occur. This peeling phenomenon is often seen at the corners of the effective screen. FIG. 10 shows an enlarged view of the corner portion of the effective screen, that is, the portion surrounded by circle A in FIG.

In Figure 10, the part indicated by a is a phosphor stripe! This is the part that fell off due to IJ111. Further, a portion indicated by b is a portion where the phosphor stripe is peeled off and bent.

The peeling phenomenon of the phosphor stripes as described above occurs because the developer sprayed onto the inner surface of the glass panel 1 collects in one place and flows out. For example, as shown in FIG. 11, when the inner surface of the glass panel 1 is viewed from the front, the glass panel 1 The pure water blown onto the inner surface of the glass panel 1 gathers at the corners of the glass panel 1 and flows out as a large water stream B. This kind of flow is
It impinges on the side parts of the phosphor strips 4, 5.6, resulting in a peeling phenomenon of the phosphor strips 4.5.6.

Defects due to drop-off of the phosphor stripes 4.5.6 significantly reduce the quality of the phosphor surface and the yield of the manufacturing process.

In order to solve these problems, conventional methods have been to adjust the width of the phosphor stripes 4.5.6 and to adjust the width of the phosphor slurry 113.
Methods have been taken to reduce the coating thickness. However, secondary problems such as fogging and a decrease in light emitting output were undesirable.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a method for forming phosphor stripes that does not cause the peeling phenomenon of phosphor stripes as described above.

Means for Solving Problem L] In the method for forming phosphor stripes according to the present invention, when spraying the developer, the developer flows in a laminar flow along the phosphor stripes to be formed. It is characterized by the arrangement of glass panels.

[Function] Since the developer sprayed onto the inner surface of the glass panel flows in a laminar flow along the phosphor stripes to be formed, the bending effect on the phosphor stripes due to the flow rate of the water flow is negligible. It is much smaller and does not cause peeling of the phosphor stripes.

[Embodiments of the Invention] Among the methods for forming phosphor stripes, the present invention is particularly characterized by a developing method for a phosphor slurry film formed on the inner surface of a glass panel. FIG. 1 is a diagram schematically showing an example of an apparatus for performing such a developing process.

The glass panel 1 is held firmly by a carrier 20. Here, the difference from the conventional device lies in the arrangement of the glass panel 1. That is, glass panel 1
By arranging the glass panel 1 in a predetermined manner,
The developer solution sprayed onto the inner surface of the tube flows in a laminar flow along the phosphor stripes to be formed. Specifically, in the IIF shown in FIG. 1, the inclination angle of the glass panel 1 is 00. In other words,
The glass panel 1 is arranged so that its inner surface faces downward and is perpendicular to the vertical line. The spray nozzle 21 is arranged directly below the glass panel 1 and is configured to spray the developer directly upward.

An actual development process was carried out using the apparatus shown in FIG. In terms of the 1R type, in an in-line type line capable of manufacturing multiple types of tubes with an index of 20'' and 14 inches to 18 inches, each spray nozzle 21 is used by Ikeuchi Co., Ltd. for the green phosphor slurry operation in 2 positions. - Seven nozzles 1/4MJ060 were arranged.The spray pressure was 2.0ka/C1, the first position was 15 seconds, the next position was 10 seconds, and the rotation of the glass panel 1 was faster than before by <20 ram per week. As a result, the developer did not collect at the corners of the glass panel 1 and flow as a large stream, but instead fell uniformly from the outer periphery of the glass panel 1.
In the figure, C indicates the flow of the developer. Further, no falling off or bending of the phosphor stripes occurred.

FIG. 2 is a schematic diagram showing another example of the developing device. The glass panel 1 is held firmly by a carrier 30. This carrier 30 is stopped at a fixed position when the developer is sprayed.

This point is different from the devices shown in FIGS. 1 and 8. That is, in the apparatus shown in FIGS. 1 and 8, the carrier is continuously rotating while the developer is being sprayed.

Furthermore, in the apparatus shown in FIG. 2, the glass panel 1 is
When the inner surface is viewed from the front, the phosphor stripes to be formed are arranged so that they are approximately parallel to the vertical line, as shown in Figure 3. . In order to realize such an arrangement, the carrier 30
A magnet 31 is fixedly attached to a predetermined position. There are two magnets 31, and they are positioned symmetrically with respect to the rotation axis of the carrier 30. A magnetic sensor 32 is fixedly provided in association with the magnet 31. When the magnetic sensor 32 detects the magnet 31, the rotation of the carrier 30 is stopped. In this way, the glass panel 1 is arranged as shown in FIG.

In the apparatus shown in FIG. 2, the carrier 30 is stopped and held during spraying of the developer, but instead, the spray nozzle 33 is moved during the spraying of the developer.

This will be explained in more detail.

The holder 34 holding the spray nozzle 33 is attached to a support 35 fixedly provided on the disk 36 so as to be rotatable in the vertical direction.

Furthermore, the holder 34 has legs 34a extending downward. A motor 37 is fixedly mounted on the disk 36. This motor 37 is connected to the legs 34 of the holder 34.
The cam 38 that is in contact with a is driven to rotate. Therefore, when the motor 37 rotates, the holder 34 rotates in the vertical direction.

Further, the disk 36 is in contact with a cam 39 that is rotationally driven by a motor 40. Therefore, motor 4
0, the holder 34 rotates in the left-right direction.

While the developer is being sprayed from the spray nozzle 33, the motors 37 and 40 are both driven to swing and rotate the holder 34 in the vertical and horizontal directions.

Specifically, after spraying the current fishing liquid for 6 seconds, first spray 1 part of the developer.
lJ1fl is interrupted for 2 seconds, during which carrier 30
/2 rotations. By this rotation of the carrier 30, the vertical position of the glass panel 1 is reversed. Even in this reversed position, the phosphor stripes 4.5.
6 is approximately parallel to the vertical line when viewed from the front, as shown in FIG. Immediately thereafter, spraying of the yA developer is started again from the spray nozzle 33, and a total of 12 seconds of development processing is performed. That arrogance,
The carrier 30 moves to the next current position, and the same developing process is performed there as well. This results in a total of 24 seconds of development, forming, for example, green phosphor stripes. When the developing process was actually carried out using the apparatus shown in FIG. 2, the developer flowed and fell along the phosphor stripes in a JII flow. In FIGS. 2 and 3, D indicates the flow of the developer.

The formed green phosphor stripes were of good quality with no falling off or bending at the corners.

In the embodiment described above, the effect on the corner phosphor stripes due to the flow rate of the developer due to the tilt angle and rotation of the glass panel 1 is minimized. The format and operation settings can be applied. Furthermore, it goes without saying that the above-described developing method is applicable not only to the development of green phosphor stripes, but also to the development of blue and red phosphor stripes or black matrix resists.

[Effects of the Invention] As described above, according to the present invention, the developer that is directed toward the inner surface of the glass panel is distributed along the phosphor stripes to be formed. Since it flows out at a speed of 7t, there is almost no bending effect on the stripes due to the water flow, and no peeling of the stripes occurs. In this way, the quality of the fluorescent surface and the manufacturing yield can be improved.

[Brief explanation of drawings]

FIG. 1 schematically shows an example of a device for carrying out the method according to the invention. FIG. 2 schematically shows another example of a device for carrying out the method according to the invention. FIG. 3 is a front view of the inner surface of the glass panel 1 held by the carrier 30 of the apparatus of FIG. FIG. 4 is a diagram showing a typical manufacturing process of a fluorescent surface. FIGS. 5, 6, and 7 are views sequentially showing how the phosphor stripes are formed on the inner surface of the glass panel 1. FIG. FIG. 8 is a schematic diagram showing an example of a conventional developing device. FIG. 9 is a diagram showing how phosphor stripes are formed on the inner surface of the glass panel 1. Figure 10 shows the 9th
It is a diagram showing an enlarged view of the part indicated by circle A in the figure. FIG. 11 is a diagram showing how the carrier liquid sprayed onto the inner surface of the glass panel 1 flows out. In the figure, 1 is a glass panel, 3 is a phosphor slurry
L4, 5.6 is phosphor stripe, 8 is carrier, 12
is a spray nozzle, 20 is a carrier, 21 is a spray nozzle, 30 is a carrier, 33 is a spray nozzle, 37!
l indicates a holder. In the figures, the same reference numerals indicate the same or corresponding parts.

Claims (3)

[Claims] (1) After applying the phosphor slurry to the inner surface of the glass panel and drying it, the phosphor slurry film is exposed to light through a shadow mask as a color selection electrode to form a latent image, and then the phosphor slurry In a method for forming a phosphor stripe in which a developer is sprayed onto a film to form a desired phosphor stripe, when the developer is sprayed, the developer causes a laminar flow along the phosphor stripe to be formed. A method for forming phosphor stripes, characterized in that the glass panels are arranged so as to flow in a straight line. (2) Formation of phosphor stripes according to claim 1, wherein the glass panel is arranged so that its inner surface faces downward and is perpendicular to a vertical line. Method. (3) The glass panel is arranged so that the phosphor stripes to be formed are substantially parallel to the vertical line when the inner surface of the glass panel is viewed from the front. A method for forming phosphor stripes as described in Section 1.