JPS6235430A - Method for forming evaporated film of color picture tube - Google Patents

Abstract

PURPOSE:To remove the dust adhering to the inner surface of a panel prior to vacuum evaporation by applying shocks to the outer surface of the panel during the time when an evaporation device is evacuated by a vacuum pump. CONSTITUTION:A fluorescent film 2 and a filming film 3 are formed on a panel 1 which is mounted on a rubber sheet packing 6 attached to an evaporation device 5. The vacuum of the device 5 is increased by the operation of a vacuum pump. At the point when the vacuum of the device 5 becomes 1X10<-1>-1X10<-3>Torr, an elastic hammer 8 is dropped by its own weight onto the outer surface of the panel 1 from a level several to 10 centimeters above the outer surface. The hammer 8 is continuously tapped on the surface of the panel 1 by repeating the above operation several to over ten times. After that, when the vacuum of the device 5 reaches a given level, a current is fed through a resistance heater 7 to evaporate aluminum in order to form a thin aluminum film 4 on the film 3. By the means mentioned above, it is possible to efficiently remove foreign substances by both vibration and sucking by a vacuum pump.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for forming a vapor deposited film for a color cathode ray tube.
In particular, the present invention relates to a method for forming a deposited film that improves the quality of the deposited film.

[Prior Art] The phosphor screen of a normal color cathode ray tube has a phosphor film on the inner surface of a panel (glass face plate) that constitutes a part of the tube body of the color cathode ray tube. ,
In order to effectively extract the light emitted from this phosphor to the front of the color cathode ray tube, an aluminum thin film is formed as a light reflective metal thin film. This is called a metal back structure, and this metal back structure increases the brightness of the color cathode ray tube and prevents ion burning caused by the electron beam.

Next, in Figure 0, which explains the process of forming a metal back according to Figure 2, (1) is a panel, (2) is a fluorescent film formed on the inner surface of this panel (1), and (3) is a panel. In order to smooth the surface of this fluorescent film (2), a filming film (4) is formed of a film lacquer material containing an organic substance as a main component, and is an aluminum thin film.

The fluorescent film (2) is formed through various steps of coating, drying, exposure and development. Further, the aluminum thin film (4) is formed by depositing aluminum on the filming film (3) in a vacuum, and the filming film (3) is then removed by baking treatment.

FIG. 3 is a block diagram schematically showing an example of a general vapor deposition apparatus. This vapor deposition apparatus has a rubber sheet backing (8) corresponding to the panel on the apparatus body (5), the panel (1) is placed on this rubber sheet backing (6), and a vacuum pump (not shown) is installed on the apparatus body (5). By operating
The inner surface of the panel (1) can be made into a high vacuum. In addition, a resistance heating element (7) is provided in the apparatus main body (5), and when an aluminum wire is attached to this resistance heating element (7) and energized at a predetermined degree of vacuum, the resistance heating element (7) is heated. ) The aluminum evaporates and scatters upward as the temperature rises due to heat generation. Due to this evaporation, the filming film (3)
An aluminum thin film (4) will be formed thereon.

[Problem to be Solved by the Invention 1] In the method for forming a vapor deposited film for a color cathode ray tube as described above, fine dust, scum, or filming lacquer residue may be present in the process of forming the fluorescent film (2), or in the transportation process. Since the aluminum thin film (4) is formed on top of the filming film (3) with foreign matter such as dirt and dust inside, discoloration and deterioration of the aluminum thin film (4) may occur in the next baking process. There were quality issues.

This invention was made to solve these problems, and by removing foreign matter such as dust, scum, or the residue of thin materials from forming the phosphor screen on the inner surface of the panel, color cathode rays can be removed. An object of the present invention is to provide a method for forming a vapor-deposited film on a pipe that improves the quality of the vapor-deposited film.

[Means for Solving the Problems] The method for forming a vapor deposited film in a color cathode ray tube according to the present invention includes a method for forming a vapor deposited film in a color cathode ray tube. Vibration is applied to the outer surface of the panel to remove dirt, dust, and other foreign matter adhering to the inner surface of the panel before vacuum deposition.

[Function] In this invention, since the panel is vibrated while being evacuated by the vacuum pump, foreign matter such as dust attached to the inner surface of the panel can be easily removed by the vibration action and the suction action, and by the evacuation action of the vacuum pump. , garbage etc. are discharged outside the system,
It is possible to prevent re-adhesion of dirt, etc.

[Example] Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram schematically showing an embodiment of the present invention. In FIG. ) is used to vibrate the panel by repeatedly hitting the outer surface of the panel, i.e., a rubber hammer weighing 300-1000 g.

Next, a method for forming a deposited film will be explained. Fluorescent film (2
) and the filming film (3) are formed on the panel (1), which is placed on a rubber sheet backing (ill) attached to the vapor deposition apparatus main body (5), and the degree of vacuum is increased by operating the vacuum pump. . At this time, the aluminum wire has already been attached to the resistance heating element (7).

When the degree of vacuum increases to 1X10 to 1X10 Torr, one elastic hammer (8) is dropped by its own weight from a height of several cm to 20 cm on the outer surface of the panel (1). Repeat this operation several times or more times, and then
) repeatedly hit the 0 surface.

After that, when a predetermined degree of vacuum is reached, electricity is applied to the resistance heating element (7) to evaporate the aluminum and film 11!
Form an aluminum thin film (4) on J (3).

Note that the vibration means (8) is not limited to an elastic hammer, and may be any other means as long as it gives vibration to the panel (1).

[Effects of the Invention] As explained above, according to the present invention, foreign matter such as dust attached to the inner surface of the panel is removed by the vibrating action of the vibrating means.
Since it can be efficiently removed by the suction action of a vacuum pump, problems such as discoloration and deterioration of the aluminum thin film caused by the foreign matter can be solved, and a deposited film of good quality can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram showing an embodiment of the present invention, FIG. 2 is a sectional view showing the state of film formation on the inner surface of a panel, and FIG. 3 is a schematic configuration diagram showing a general vapor deposition apparatus. (1)... Panel, (2)... Fluorescent film, (4)...
・Aluminum thin film, (5)... Vapor deposition apparatus main body, (8
)...Vibration means. In addition, in the figures, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] (1) In a vapor deposition film forming method in which a color cathode ray tube panel is placed in a vapor deposition apparatus and a light-reflective metal thin film is vacuum vapor-deposited on the phosphor screen on the inner surface of the panel, a vibrating means is used to create a vacuum inside the vapor deposition apparatus. A method for forming a vapor deposited film for a color cathode ray tube, characterized by applying vibration to the panel and removing foreign matter adhering to the inner surface of the panel before vacuum vapor deposition.