JPH0212736A - Surface treatment device of panel for cathode-ray tube - Google Patents

Abstract

PURPOSE:To prevent the generation of an uneven thickness of membrane by making the upper surface of a plate-form body provided to cover a panel face in a curved surface extending along the extension surface of the panel face. CONSTITUTION:A plate 10 and a tube 9 are provided on a panel face. The plate 10 of a disk form, for example, can be regulated so that its form has a curvature of a spherical surface same as that of the panel face when the panel face is a spherical surface, and a bending in a cylindrical form as a whole when the panel face is cylindrical. By setting such a disk 10, the wind turning in from the side surface can be removed, and by setting the tube 9 with the diameter in the same level as the diameter of the disk 10, the surface wind generated by the revolution can be reduced. The generation of an uneven thickness of membrane can be prevented consequently.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a surface treatment device for a cathode ray tube panel face, which forms a coating such as a transparent conductive film with a uniform thickness on the panel face by a spin coating method. be.

[Prior Art] Conventionally, it is not well known that a transparent conductive film can be deposited on the panel face of a cathode ray tube using a spin coating method.

Generally speaking, the spin coating method is a method in which a relatively lightweight flat plate substrate is rotated at a high speed of 1100 Orp or more and a treatment solution is applied.
It was difficult to implement this method with a substrate that weighs 0 kg and has a spherical, aspherical, or cylindrical shape.

In general spin coating, coating is carried out using a relatively small (and flat) substrate and rotating at a high speed of 000 rpm or higher, so that film thickness unevenness (interference color) does not occur around the substrate.

However, when applying this to a cathode ray tube, it is necessary to perform the process at a low rotation speed of 1,100 rpm or less because the centrifugal force generated by high-speed rotation causes problems such as displacement of the shadow mask. Because of its shape, it is difficult for the coating liquid to spread uniformly, leading to problems such as uneven film thickness around the panel.

[Problem to be solved by the invention] Since the conventional spin coating method is carried out under the conditions described above, when forming a film on the cathode ray tube face panel, there are problems such as interference colors occurring around the panel face. had.

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

(1) Generally, the processing liquid is pushed outward by the centrifugal force generated by the rotation of the panel 5, but as the rotation speed becomes lower, the centrifugal force becomes smaller (becomes smaller), and the liquid is dominated by the liquid flow direction 3 generated by the rotational force. becomes difficult to stretch in the liquid flow direction 2 due to centrifugal force.For this reason, the peripheral part of the panel corner 7
Liquid pooling is likely to occur.

(2) After being applied, the treatment liquid gradually dries to form a film. However, at some panel corners 7, force is applied from the wind direction 4 due to rotation, and the circumferential speed is high (and the panel face is Because the air receives force from the wind direction 6, the air volume is high and the drying speed is fast.

Due to the reasons (1) and (2) above, the panel corner portion 7
Due to the increased drying speed, the liquid puddles generated in the process dry before flowing down from the panel face, resulting in uneven film thickness. This film thickness unevenness is visually observed as an interference color difference compared to the center part of the panel face.

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

[Function] In the present invention, the surface treatment device is provided with a plate and a tube on the panel face to prevent the wind from blowing on the panel face, reduce the drying speed of the liquid in a part of the panel corner, and reduce the drying rate of the liquid in the panel corner. Promote the flow of the processing liquid in section 7,
Prevents uneven film thickness (interference color).

[Example] The present invention will be described below based on the example shown in FIGS. 1 to 6.

8 is a cathode ray tube, which is installed in the spinner device 11 via a shrink-fit band 12. Reference numeral 10 denotes a disk 10 having approximately the same curvature as the panel face, and has a diameter that is about 0 to 600 m/m longer than the diagonal length of the panel, preferably Oy 100 m/m. If it is 400 m/m or more, the shape becomes too large and is not suitable for work. Disk 1
0 can be adjusted to have the same spherical curvature if the panel face is spherical, or by bending the entire panel into a cylindrical shape if the panel face is cylindrical. The wind on the panel surface generated by rotation is a combination of the wind coming in from the side of the panel and the wind on the surface, but by installing this disc, the wind coming in from the side This has the effect of reducing the amount of wind on the surface.

9 is a cylinder having a diameter equivalent to the diameter of the disk, and it only needs to have a height higher than the top of the panel face, that is, it needs to have a height of 50 mm or more higher than the height of a part of the panel corner, and the higher it is, the more preferable. The installation of this cylinder has the effect of reducing surface winds generated by rotation. If the height of the cylinder is less than 50 mm, such an effect cannot be obtained, which is disadvantageous.

Moreover, as shown in FIGS. 3 and 4, even when the disk 1O is not used, almost the same effect can be obtained.

In this case, the cylinder 14 becomes a cylinder having the same shape as the outer periphery of the panel.

Furthermore, when installing a disk and a cylinder or tube, a gap of about 1 to 2+n+n should be made between the disk and cylinder or between the tube and the cathode ray tube in order to drain excess liquid on the panel face.
It is preferable to provide 3. If this gap is insufficient, excess liquid on the panel face cannot escape to the outside of the panel face, resulting in liquid pooling and uneven film thickness (interference color). When using the disc 10, the disc allows the liquid to smoothly flow out of the panel face, so there is no need to provide a gap.

Other embodiments are shown in FIGS. 5 and 6.

A spinner device 11 is installed in which a plate 15 whose bottom portion has approximately the same curvature as the panel face is stood upright with a slight gap above the panel face at both ends on one diagonal axis of the panel face.
Fix it on top. The plate 15 used has a length of 50 cm in the diagonal axis direction and a height of 50 c+n. The height may be lower, as long as it blocks the wind in a part of the panel corner. The gap between the lower part of the plate 15 and the panel face is preferably 10 to 20 m+n. If it is smaller than 10 mm, the treatment liquid may fly and stick to the surface, and if it is larger than 20 mm, the effect of reducing the wind coming in from the side of the panel and the wind on the panel face will be reduced.

The gap 13 between the plate 15 and the side surface of the panel is 211 Im. 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 a rotary table so that only the cathode ray tube 8 rotates.

Further, a plate 15 is provided on the rotating table, and the cathode ray tube 8 and the plate 1 are connected to each other.
5 may be surrounded by a cylinder so that they rotate together. When the plate 15 is provided on one diagonal axis in FIG. 6, the panel rotates clockwise when viewed from above, and the plate 15 is placed at the corner where the wind directly hits the long side that intersects at a large angle with the tangential direction of rotation. In the case of counterclockwise rotation, it is preferable to provide a plate 15 on the other diagonal axis. Further, when the panel face is square, it is preferable to provide the plates 15 on two diagonal axes.

In the embodiments shown in FIGS. 1 to 6, the disk 10, cylinder 9, cylinder 14, and plate 15 are preferably made of materials that do not corrode in acidic processing solutions, and stainless steel, vinyl chloride, etc. are preferable. The treatment liquid is a silica sol solution made using silicon halide, silane alkoxide, or silyl isocyanate, etc., containing Fe, Co, Ni, Cu, Ag, Zn, AI, and I.
An antistatic coating solution containing one or more compounds selected from n halides, nitrates, and sulfates was used. As the treatment liquid, an anti-glare solution may be used, and furthermore, a solution for both anti-glare and antistatic properties may be used.

Table 1 shows a comparison between three embodiments of the present invention and a conventional example.

Here, a spin coating method for forming a transparent antistatic film will be described in both Examples and Conventional Examples.

Table Examples 1 to 3 show no interference color on the panel face,
There was no difference in film thickness between the center and corners of the panel face. With conventional CRT devices, interference colors were seen and the film was thicker at the corners than at the center of the panel face.

[Effects of the Invention] The surface treatment apparatus of the present invention has made it possible to spin-coat a cathode ray tube without interference color on a part of the panel corner at a low rotation speed of 500 rpm or less, which was previously impossible.

Generally, it is known that the thicker the coat film is, the better the film strength (wear resistance) is, but on the contrary, it tends to be more likely to have uneven film thickness. Therefore, this device is particularly effective when it is necessary to apply a relatively thick film.

Regarding the substrate shape, compared to a flat plate, interference colors are more likely to occur if the substrate has an asymmetrical or uneven shape, or if the long sides of a rectangular parallelepiped are relatively long, but even in this case, a large effect is observed. . In spin coating at high speed rotation of 11,000 rpm or more, the circumferential speed at the edge is faster (which causes problems such as film tearing, which is the opposite of interference color), but in the present invention, film tearing can be prevented. It also has this effect.

Further, by providing the cylinder, the processing liquid is prevented from scattering on the inner wall surface of the coating booth housing the processing apparatus of the present invention, and it is also effective as a cover to protect the apparatus, making maintenance very simple. By replacing the cylinder, defects caused by dry solids of the coating liquid scattered on the inner wall of the cylinder falling onto the film surface can be prevented and continuous work can be performed. This is more effective in the case of corrosive processing liquids. As described above, this method has excellent effects in terms of workability as well.

[Brief explanation of the drawing]

1 to 6 show embodiments of the present invention, and FIGS.
The figures are a schematic sectional view and a plan view of a device in which a disk and a cylinder are provided around the panel, and FIGS. 3 and 4 are a schematic 4th view of the device in which a tube is provided around the panel. FIGS. 5 and 6 are a cross-sectional view and a plan view taken along line A-A', and FIGS. 7 and 8 show a conventional example, and FIG. 7 is a plan view of the panel face showing the various directions that the processing liquid on the panel face is subjected to due to the rotation of the cathode ray tube. FIG. 8 is a partially enlarged perspective view of a part of the panel corner showing the direction of the wind in the part of the panel corner. 5...Panel 7...Panel corner part 8...Cathode ray tube 9...Cylinder 10...Circle Plate 13...Gap 15...Plate 1st whistle

Claims (5)

[Claims] (1) In a surface treatment device for a cathode ray tube panel face that forms a film on the panel face of a cathode ray tube by a spin coating method, a plate-like body is provided around the panel so as to surround the panel face, and the plate-like body A surface treatment device for a cathode ray tube panel face, wherein the upper surface is a curved surface extending along an extended surface of the panel face. (2) The surface treatment device for a cathode ray tube panel according to claim 1, characterized in that a cylindrical body is provided around the plate-shaped body to a position higher than at least the top of the panel face. (3) A surface treatment device for a cathode ray tube panel face, characterized in that a cylindrical body is provided at least at a position higher than the top of the panel face with a desired gap around the panel. (4) Stand upright a plate whose lower part has approximately the same curvature as the panel face with a slight gap above the panel face at both ends on at least one diagonal axis of the panel face, and place it on a rotating table so that it rotates with the cathode ray tube. A surface treatment device for a cathode ray tube panel face, which is fixed to a surface. (5) With the cathode ray tube stationary, a plate whose lower part has approximately the same curvature as the panel face is placed upright at both ends on at least one diagonal axis of the panel face with a slight gap above the panel face. 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 a rotating table so that only the cathode ray tube rotates.