JPH07161291A - Thin film forming device for cathode-ray tube face external surface - Google Patents

Abstract

PURPOSE:To prevent dust from sticking to a face external surface of a cathode-ray tube by providing an air flow generating part for generating a flow of air in the downward direction in a body of equipment, and providing a discharge device for discharging air in the body of equipment through a gas discharge port in a bottom part of the body of equipment. CONSTITUTION:When a thin film is formed in an external surface of a face 1 by a thin film forming device, a film forming liquid, applied to the external surface of the face 1 by a spray, flows in a peripheral part direction along the external surface of the face 1 by centrifugal force generated by rotating a cathode-ray tube 13, to scatter a surplus film forming liquid in a radial direction. Here, an air flow generator 17 mounted on a cathode-ray tube supporter 12 is rotated with the supporter 12, to generate an air flow in the downward direction in a body of equipment 11. Consequently, even when solid matter is separated, it is guided to a bottom part direction of the body of equipment 11 by the air flow in the downward direction and further discharged from a gas discharge port 10 in a bottom part of the body of equipment 11 by a discharge device, to prevent the solid matter from sticking to the external surface of the face 1 of the cathode-ray tube 13.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thin film forming apparatus for forming an outer surface of a cathode ray tube on which a thin film for preventing charging or reflection of external light is formed on the outer surface of the face of the cathode ray tube.

[0002]

2. Description of the Related Art Generally, a cathode ray tube is constructed as shown in FIG.
Phosphor screen 2 on the inner surface of face 1 made of glass
Is formed, and the phosphor screen 2 is horizontally and vertically scanned by the electron beam emitted from the electron gun 4 arranged in the neck 4 of the funnel 3 to form an image display structure.

The cathode ray tube shown in FIG. 2 is a color picture tube, 6 is a shadow mask arranged inside the phosphor screen 2 so as to face it, and 7 is an explosion-proof band for tightening the side wall of the face 1. is there.

In such a cathode ray tube, in which a high voltage is applied to the phosphor screen 2 in order to display a particularly high-luminance image, the high voltage is induced on the outer surface of the face 1 to be charged, If dust or the like adheres to the outer surface of the face 1 due to this charging, the image becomes difficult to see. When a human body comes into contact with the outer surface of the face 1, an electric shock is received. Further, since the outer surface of the face 1 of the cathode ray tube is generally formed as a mirror surface, external light is reflected on the outer surface of the face 1 and the contrast of an image viewed through the face 1 is deteriorated. Especially in computer displays and the like, since the screen is often viewed from a short distance, the reflection of external light promotes eye fatigue.

In order to prevent such charging of the outer surface of the face or reflection of external light, it has been conventionally known to form a thin film having an effect of charging and / or antireflection on the outer surface of the face.

As a method of uniformly and inexpensively forming the thin film having the antistatic and antireflection effect, there is a method of spin coating a volatile film forming liquid. This method is performed by spraying a film forming liquid on the outer surface of the face while rotating the cathode ray tube, and uniformly spreading the film forming liquid applied on the outer surface of the face by the centrifugal force generated by the rotation of the cathode ray tube. .

However, this method has a problem of dust adhesion, and the dust wound up during the rotation of the cathode ray tube adheres to the film forming liquid applied to the outer surface of the face, and the flow of the film forming liquid due to the centrifugal force is prevented. It is easy to change the color and make unevenness in the radial direction starting from dust. Even if the film-forming liquid can be applied without any defect, if dust adheres before it is completely dried, spot-like spots are formed.

Several methods have been developed to solve such a problem. Among them, Japanese Patent Laid-Open No. 1-32072
The method shown in Japanese Patent No. 8 requires a complicated special device. Further, the methods disclosed in Japanese Patent Laid-Open No. 2-158034 and Japanese Patent Laid-Open No. 195629/1990 may accumulate dust and lose its effect when used for a long period of time. Further, the flow of air (air flow) generated by the rotation may affect the flow of the film forming liquid, which may deteriorate the film quality.

[0009]

As described above, in order to prevent the charging of the outer surface of the face of the cathode ray tube or the reflection of external light, the thin film having the charging and / or antireflection effect on the outer surface of the face has been conventionally used. Is known to form. As a method of uniformly and inexpensively forming a thin film having this antistatic or antireflection effect, a volatile film forming liquid is sprayed on the outer surface of the face while rotating the cathode ray tube, and is applied to the outer surface of the face by centrifugal force. There is known a method of uniformly spreading a film forming solution. However, in this method, dust that is rolled up during rotation adheres to the film-forming liquid applied to the outer surface of the face, and the flow of the film-forming liquid changes due to centrifugal force, which can cause uneven coating in the radial direction starting from the dust. Cheap. Further, even if the film-forming liquid can be applied without defects, if dust adheres before the film is completely dried, spot-like spots may be formed.

Several methods have been developed to solve such problems. However, these methods require complicated special equipment or, if they are used for a long period of time, they accumulate dust and are effective. There is a possibility that it may disappear, and the flow of air generated by rotation may affect the flow of the film-forming liquid, which may deteriorate the film quality, which is not preferable in practice.

The present invention has been made in view of the above problems, and does not require a complicated special device,
An object of the present invention is to configure a thin film forming apparatus capable of easily and inexpensively forming a good quality thin film on the outer surface of a cathode ray tube face.

[0012]

In a thin film forming apparatus for an outer surface of a cathode ray tube face, the thin film forming apparatus comprises a casing having a gas discharge port at a bottom portion, and a face outer surface of the cathode ray tube facing downward and an inner side of the casing. On the outer surface of the face of the cathode ray tube which is rotatably supported on the upper part of the housing and is rotationally driven by the driving device, and the cathode ray tube which is disposed in the housing and is supported downward by the cathode ray tube support. A nozzle for spraying the film-forming liquid, an air flow generation unit attached to the cathode ray tube support, which generates a downward airflow in the housing due to the rotation of the cathode ray tube support, and a gas exhaust provided at the bottom of the housing. And an exhaust device for exhausting the air inside the housing through the outlet.

[0013]

With the above construction, even if dust is rolled up by the rotation of the cathode ray tube support and the cathode ray tube supported by this cathode ray tube support, the downward airflow obtained by the airflow generating section and the bottom of the housing are obtained. By discharging the air from the gas discharge port provided in, it is possible to prevent the cathode ray tube from adhering to the outer surface of the face.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described based on embodiments with reference to the drawings.

FIG. 1 shows a thin film forming apparatus which is an embodiment of the present invention. This thin film forming apparatus is rotatably supported by a bottomed cylindrical casing 11 having a gas discharge port 10 connected to a discharge device (not shown) at the bottom, and an upper opening of this casing 11. And a disk-shaped cathode ray tube support 12 which is rotationally driven by a driving device (not shown). The cathode ray tube support 12 has a face 1 of a cathode ray tube 13 at the center thereof.
The cathode ray tube 13 has an explosion-proof band for tightening the side wall of the face 1 so that the outer surface of the face 1 faces downward and is inside the housing 11. It is attached using the lug plate 14 or the like attached to 7. The cathode ray tube 13 attached to the cathode ray tube support 12 is rotationally driven together with the cathode ray tube support 12 so that the tube axis Z becomes the rotation center axis. In addition, facing the outer surface of the face 1 of the cathode ray tube 13, the housing 1
Nozzle 1 for spraying a film forming liquid for forming a thin film having an electrification effect and / or an antireflection effect inside 1
6 is installed. Further, on the lower surface of the cathode ray tube support 12 (the surface on the inner side of the housing 10), the cathode ray tube support 12
An airflow generator 17 including a fin or the like that rotates together with the airflow and generates a downward airflow is installed in the housing 11.

To form a thin film by this thin film forming apparatus, the cathode ray tube 13 is attached to the opening of the cathode ray tube support 12 so that the outer surface of the face 1 faces downward and is inside the housing 11, and the cathode ray tube support 12 is formed. Rotate with. Then, the film forming liquid is sprayed from the nozzle 16 toward the outer surface of the face 1 of the rotating cathode ray tube 13, and the film forming liquid applied to the outer surface of the face 1 is centrifuged by the rotation of the cathode ray tube 13. It is formed by spreading uniformly by force.

By the way, when a thin film is formed by the thin film forming apparatus, the film forming liquid applied to the outer surface of the face 1 by spraying is applied along the outer surface of the face 1 by the centrifugal force generated by the rotation of the cathode ray tube 13. The surplus film-forming liquid flows in the peripheral direction, and the excess film-forming liquid is scattered in the radial direction from the peripheral part of the outer surface of the face 1.

In this case, in the conventional thin-film forming apparatus, the film-forming liquid scattered from the peripheral portion of the outer surface of the face adheres to the inner wall of the housing and is dried and solidified. The tube and the cathode ray tube support that supports it are rolled up by the flow of air in the housing caused by the rotation, and adhere to the outer surface of the face of the cathode ray tube, causing a film defect. The airflow generator 17 attached to the cathode ray tube support 12 rotates together with the cathode ray tube support 12 to generate a downward airflow in the housing 11. Therefore, even if the solid matter adhered to the inner wall of the housing 11 and solidified is peeled off, the solid matter (dust)
Is guided toward the bottom of the housing 11 by the downward airflow generated by the airflow generator 17, and the housing 1 is discharged by the discharge device.
The gas is discharged from the gas discharge port 10 provided at the bottom of the cathode ray tube 1 to prevent the cathode ray tube 13 from adhering to the outer surface of the face 1.
Therefore, according to this thin film forming apparatus, a thin film having good quality, good electrification and / or antireflection effect, or both, can be easily and inexpensively formed on the outer surface of the face 1 of the cathode ray tube 13 with a simple structure. be able to.

[0019]

The apparatus for forming a thin film on the outer surface of the face of the cathode ray tube is provided with a housing having a gas discharge port at the bottom and an upper surface of the housing so that the outer surface of the face of the cathode ray tube faces downward and is inside the housing. A cathode ray tube support member that is rotatably supported and is rotationally driven by a drive device, and is disposed in the housing,
A nozzle that sprays a film-forming liquid on the outer surface of the face of the cathode ray tube that is supported downward by the cathode ray tube support, and a downward airflow that is attached to the cathode ray tube support and that rotates with the cathode ray tube support. And a discharge device for discharging air in the housing through a gas discharge port provided at the bottom of the housing, the cathode ray tube support and the cathode ray tube supported by the cathode ray tube support. Even if dust is rolled up due to the rotation of the tube, the downward airflow obtained by the airflow generator and the discharge of air from the gas outlet provided at the bottom of the housing prevent the cathode ray tube from adhering to the outer surface of the face. The device having a simple structure can easily and easily form a thin film having no defect on the outer surface of the face of the cathode ray tube and having good quality electrification and / or antireflection effect. It can be formed to the valence.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of a thin film forming apparatus that is an embodiment of the present invention.

FIG. 2 is a diagram showing a configuration of a cathode ray tube.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Face 10 ... Gas discharge port 11 ... Housing 12 ... Cathode ray tube support 13 ... Cathode ray tube 16 ... Nozzle 17 ... Air flow generator

Claims (1)

[Claims] 1. A casing provided with a gas discharge port at the bottom, and a rotatably supported by a driving device on the upper part of the casing such that the outer surface of the face of the cathode ray tube faces downward and is inside the casing. A cathode ray tube support, a nozzle disposed in the housing, spraying a film-forming solution onto the outer surface of the face of the cathode ray tube supported downward by the cathode ray tube support, and attached to the cathode ray tube support. An airflow generator that generates a downward airflow in the housing with the rotation of the cathode ray tube support, and a discharge device for discharging the air in the housing via a gas discharge port provided in the bottom of the housing. An apparatus for forming a thin film on an outer surface of a cathode ray tube face, comprising: