JPH07109747B2 - Surface treatment device for panel face for ground pipe - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a surface treatment device for a panel face for a cathode ray tube, which forms a film such as a transparent conductive film having a uniform film thickness on the panel face by a spin coating method. is there.

[Prior Art] It has not been well known that a transparent conductive film is deposited on a panel face of a cathode ray tube by a spin coating method.

This is generally a spin coating method, in which a relatively lightweight flat plate substrate is rotated at a high speed of 1000 rpm or more to apply a treatment liquid, and has a weight of several kg to several tens of kg like a cathode ray tube, and a spherical surface, It was difficult to carry out on a substrate having an aspherical surface or a cylindrical shape.

In general spin coating, since a relatively small and flat substrate is used and coating is performed at a high speed of 1000 rpm or more, uneven film thickness (interference color) is less likely to occur around the substrate.

However, when it is applied to a cathode ray tube, it is necessary to perform the rotation at a low speed of 100 rpm or less because a problem such as displacement of the shadow mask is caused by the centrifugal force generated by the high speed rotation. Since it has a shape, it is difficult for the coating solution to spread uniformly, and problems such as uneven film thickness occur around the panel.

[Problems to be Solved by the Invention] Since the conventional spin coating method is carried out under the conditions as described above, there is a problem that an interference color is generated around the panel face when a film is formed on the cathode ray tube face panel. Had.

The reason why the interference light is generated around the panel face by the spin coating method is considered to be as follows. 7 and 8 show the flow direction of the processing liquid on the panel face.

(1) The treatment liquid is generally pushed out by the centrifugal force generated by the rotation of the panel 5, but the centrifugal force becomes smaller as the rotation speed becomes lower, and the treatment liquid is controlled by the liquid flow direction 3 generated by the rotation force, and the liquid is It becomes difficult to extend in the liquid flow direction 2 due to the centrifugal force. Therefore, the panel corner 7 which is the peripheral part
A liquid pool is likely to occur.

(2) The coating liquid is gradually dried after application to form a film, but at the panel corner portion 7, a force is applied from the wind direction 4 due to rotation, and the peripheral speed is fast and the side surface is applied to the panel face. Since the force is applied from the wind direction 6, the amount of air increases and the drying speed increases.

Due to the reasons (1) and (2) above, the liquid pool generated in the panel corner portion 7 dries before the liquid drops run down from the panel face due to an increase in the drying speed, and uneven film thickness occurs. This film thickness unevenness is visually recognized as an interference color difference compared to the central portion of the panel face.

[Means for Solving the Problems] The present invention has been made to solve the above-mentioned problems, and in a surface treatment device for a panel face for a cathode ray tube for forming a coating on the panel face of a cathode ray tube by a spin coating method, A plate-shaped body is provided around the panel so as to surround the panel face, and an upper surface of the plate-shaped body is a curved surface extending along an extended surface of the panel face. The present invention provides a surface treatment device of the above.

[Operation] In the present invention, the surface treatment device is provided with the plate and the cylinder on the panel face to prevent wind received by the panel face, reduce the drying speed of the liquid in the panel corner portion, and reduce the panel corner portion 7 To promote the flow of processing liquid,
Prevents uneven film thickness (interference color).

[Examples] The present invention will be described below based on Examples shown in Figs. 1 to 6.

A cathode ray tube 8 is installed on the spinner device 11 via a shrink fit band 12. 10 is a circular plate 10 having almost the same curvature as the panel face, and the diameter is 0 to 600 m / m longer than the diagonal length of the panel, preferably 0 to 100 m.
/ m. Above 400 m / m, the shape is too large and it is not suitable for work. The disc 10 can be adjusted so that it has the same spherical curvature when the panel face is a spherical surface, and when the panel face is a cylindrical face, it is entirely bent into a cylindrical shape. The wind generated by the rotation on the panel surface is a combination of the wind that wraps around from the side of the panel and the wind on the surface. By installing this disc, the wind that wraps around from the side It has the effect of removing and reducing the amount of wind on the surface.

9 is a cylinder having a diameter equivalent to the diameter of the disk, and it is sufficient if it has a height higher than the top of the panel face, that is, 50 mm or more higher than the height of the panel corner, and the higher the better. . By installing this cylinder,
The effect is to reduce wind on the surface caused by rotation. If the height of the cylinder is less than 50 mm, such an effect cannot be obtained, which is inconvenient.

Further, as shown in FIGS. 3 and 4, substantially the same effect can be obtained even when the disc 10 is not used. In this case, the cylinder 14
It becomes a cylinder having the same shape as the outer periphery of the panel.

Further, when the disc and the cylinder or the cylinder are installed, it is preferable to provide a gap 13 of about 1 to 2 mm between the disc and the cylinder or the cylinder and the cathode ray tube in order to allow the excess liquid on the panel face to flow. . If this gap is insufficient, the excess liquid on the panel face cannot escape to the outside of the panel face, so that a liquid pool occurs and uneven film thickness (interference color) occurs.
When the disk 10 is used, the liquid smoothly flows out of the panel face due to the disk, and thus it is not necessary to provide a gap.

Another embodiment is shown in FIGS. 5 and 6.

A small gap is formed on the panel face at both ends on one diagonal axis of the panel face, and a plate 15 having a bottom portion having substantially the same curvature as the panel face is erected and fixed on the spinner device 11. The plate 15 has a diagonal length of 50 cm and a height of 50 cm. The height may be lower, as long as it blocks wind from the panel corners.
The gap between the lower part of the plate 15 and the panel face is preferably 10 to 20 mm. If it is less than 10 mm, the treatment liquid may fly and adhere, and if it is more than 20 mm, the effect of reducing the influence of wind that wraps around the side surface of the panel and wind on the panel face becomes small. The gap 13 between the plate 15 and the side surface of the panel is 2 mm. In this embodiment, four plates 15 may be provided at both ends on two diagonal axes, or the plates 15 may be provided on a base other than the turntable so that only the cathode ray tube 8 rotates.
Further, the plate 15 may be provided on a turntable so that the cathode ray tube 8 and the plate 15 are surrounded by a cylinder so as to rotate together. When the plate 15 is provided on one diagonal axis in FIG. 6, the panel is rotated clockwise as viewed from above, and the plate 15 is placed at the corner where the wind on the long side intersecting with the tangential direction of rotation directly hits. It is provided, and in the case of counterclockwise rotation, it is preferable to provide the plate 15 on the other diagonal axis. Also, if the panel face is square, it is preferable to provide the plates 15 on two diagonal axes.

In the embodiment shown in FIGS. 1 to 6, the disc 10, the cylinder 9, the cylinder 14, and the plate 15 are preferably made of a material that does not corrode with an acidic treatment liquid, and preferably stainless steel, vinyl chloride, or the like. The treatment liquid is a silica sol solution made using silicon halide, silane alkoxide or silyl isocyanate.
A solution for an antistatic coating containing one or more compounds selected from halides, nitrates or sulfates of Fe, Co, Ni, Cu, Ag, Zn, Al and In was used. As the treatment liquid, a solution for anti-glare can be used, and a solution for both anti-glare and antistatic may be used.

Table 1 shows a comparison between the three examples of the present invention and the conventional example.
Here, the spin coating method in the case of forming the transparent antistatic film is shown in the examples and the conventional examples.

In Examples 1 to 3, no interference color of the panel face was observed,
There was no difference in film thickness between the center and the corner of the panel face. In a conventional device using only a cathode ray tube, an interference color was observed and the film thickness was larger in the corner than in the center of the panel face.

[Advantages of the Invention] The surface treatment apparatus according to the present invention has been impossible in the past.
Spin-coating of cathode ray tubes without interference colors at the panel corners is possible at low speeds of 500 rpm or less.

It is generally known that the film strength (wear resistance) increases as the film thickness increases, but on the contrary, the film thickness unevenness tends to occur. Therefore, this device is particularly effective when the film thickness needs to be relatively thick.

Also in the substrate shape, if it has an asymmetric or uneven shape compared to a flat plate, or if the long side of the rectangular parallelepiped is relatively long, interference color is more likely to occur, but in this case also a great effect is recognized. . In the spin coating of 1000 rpm or more high-speed rotation, the peripheral speed of the edge becomes faster, and problems such as film breakage occur contrary to the interference color, but in the present invention it is possible to prevent the occurrence of film breakage It also has an effect.

Further, by providing the cylinder, the treatment liquid does not scatter on the inner wall surface of the coating booth accommodating the treatment apparatus of the present invention, and the effect as a cover for protecting the apparatus is recognized, and the maintenance becomes very simple. By replacing the cylinder, it is possible to prevent the occurrence of defects due to the drop of the dried solid content of the coating liquid scattered on the inner wall surface of the cylinder, and it is possible to perform continuous work. This is more effective for corrosive treatment liquids. As described above, the workability is also excellent.

[Brief description of drawings]

FIGS. 1 to 6 show an embodiment of the present invention, and FIGS.
The figure is a schematic cross-sectional view and a plan view of an apparatus in which a disk and a cylinder are provided around the panel, and FIGS. 3 and 4 are schematic fourth views of an apparatus in which a tube is provided around the panel. 5A and 5B are a cross-sectional view and a plan view taken along the line AA ′, and FIGS. 5 and 6 are schematic views of FIG. 6B of the device in which plates are provided at both ends on one diagonal axis on the panel face.
FIGS. 7 and 8 show a conventional example, and FIG. 7 shows the direction of each force received by the treatment liquid on the panel face due to the rotation of the cathode ray tube. FIG. 8 is a partially enlarged perspective view of the panel corner portion showing the wind direction of the panel corner portion. 5 …… Panel 7 …… Panel corner 8 …… CRT 9 …… Cylinder 10 …… Disc 13 …… Gap 15 …… Plate

Claims (5)

[Claims] 1. A surface treatment device for a panel face for a cathode ray tube, which forms a film on a panel face of a cathode ray tube by a spin coating method, wherein a plate-like body is provided around the panel so as to surround the panel face. A surface treating apparatus for a panel face for a cathode ray tube, wherein an upper surface of the body is a curved surface extending along an extension surface of the panel face. 2. The surface treating apparatus for a cathode ray tube panel according to claim 1, wherein a tubular body is provided around the plate-like body at least at a position higher than the top of the panel face. 3. A surface treating apparatus for a panel face for a cathode ray tube, characterized in that a tubular body is provided at a position higher than the top of the panel face with a desired gap around the panel. 4. A plate having a slight curvature on the panel face at both ends on at least one diagonal axis of the panel face, a plate having a lower portion having substantially the same curvature as that of the panel face is erected and rotated so as to rotate together with the cathode ray tube. A surface treatment device for a panel face for a cathode ray tube, which is fixed on a table. 5. A plate having a curvature which is substantially the same as that of the panel face at the bottom is set upright with a slight gap on the panel face at both ends on at least one diagonal axis of the panel face while the cathode ray tube is stationary. A surface treatment device for a panel face for a cathode ray tube, characterized in that the plate is fixed to a base other than the turntable so that only the cathode ray tube rotates.