JPH03173043A - Manufacture of phosphor film of color cathode-ray tube - Google Patents

Abstract

PURPOSE: To reduce labor in producing a product by performing recovery of surplus phosphor slurry and cleaning of an edge part of a panel in this order between the phosphor slurry applying stage and the fluorescent screen drying stage. CONSTITUTION: Recovery of surplus phosphor slurry and cleaning of an edge part of a panel are performed in this order between the phosphor slurry applying stage and the fluorescent screen drying stage. Phosphor slurry is applied to an inside surface of the panel, and in the second stage, after the panel is transferred to a phosphor slurry recovering device, when this is rotated at high speed, after it is diffused and distributed to the panel by centrifugal force, its residual surplus phosphor slurry is recovered. In the third stage, a residue or the like of a phosphor stuck to the edge part of the panel is cleaned and removed through a cleaning device, and the panel is dried by a hot air and radiation heat. Therefore, the process number is shortened, and cost is reduced, and productivity of a product can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a method for manufacturing a phosphor film for a color cathode ray tube.

(Prior Art) A general method for manufacturing a phosphor film on the inner surface of a panel of a color cathode ray tube is as shown in the process sequence generally shown in FIG. This process will be specifically explained.

In the phosphor slurry application stage, a constant amount of phosphor slurry is supplied to the inner surface of the panel while rotating the panel at an appropriate speed, so that the phosphor is coated on the entire inner surface of the panel. , - After drying, the skirt of the panel is cleaned ultrasonically.

In the surplus phosphor collection step, the panel is rotated at high speed to collect the remaining phosphor slurry that has been applied to the inner surface of the panel, and the phosphor film is then subjected to secondary drying. let

And in the subsequent edge cleaning step.

The remaining phosphor attached to the edge of the panel, that is, the front end surface of the panel skirt that is in close contact with the funnel, and other waste materials are washed away.

In the exposure step, a fluorescent spot of a predetermined shape is formed on the inner surface of the panel through an exposure device, and after the exposure is completed, the fluorescent film is washed and developed.

This series of steps is repeated three times because the three colors of phosphors must be applied separately.

(Problems to be Solved by the Invention) In the conventional method for manufacturing a fluorescent film, the edge cleaning operation of the panel is performed after the drying operation is performed twice as described above. At this time, the fluorescent film on the inner surface of the panel is in a completely dry state, so cleaning of the edges is incomplete. There is a possibility that the fluorescent film may be damaged by being scattered.

This invention reduces the incidence of product defects, and
The object of the present invention is to provide a method for manufacturing a phosphor film for a color cathode ray tube, which can save labor in product production.

(Means for solving problems) The present invention aims to achieve the above objects.

A method for producing a phosphor film for a color cathode ray tube, which includes a step of applying a phosphor slurry, a step of recovering excess phosphor, a step of cleaning the edge of the panel, a step of exposing the phosphor film, a step of developing the phosphor film, etc. A feature is that, between the phosphor slurry application step and the phosphor film drying step, a surplus phosphor slurry recovery step and a panel edge cleaning step are performed in the order. .

(Embodiment) Hereinafter, one preferred embodiment of the present invention will be described in detail with reference to FIG. 1 of the accompanying drawings.

In the first step, the panel is rotated at a low speed by a predetermined rotation means while the panel is positioned at a slight inclination with the inner surface facing upward. Then, a certain amount of phosphor slurry is injected from above the panel, and once the injection of phosphor slurry is completed, the panel is rotated at high speed to coat the inner surface of the panel with phosphor slurry.
− will be disseminated.

In the second step, the panel is transferred to a conventional phosphor slurry recovery device, which is rotated at high speed, and the residual phosphor slurry is spread over the panel by centrifugal force. be collected.

In the third step, the foreign matter adhering to the panel through the above steps, especially the phosphor residue adhering to the edge of the panel, is washed out using a conventional cleaning device.

In the fourth step, the fluorescent film formed on the inner surface of the panel is dried using hot air and radiant heat.

Then, through the subsequent normal steps, the phosphor film is exposed to light and developed.

This series of steps is repeated for each tricolor phosphor.

(Effects of the Invention) According to the present invention, unlike the conventional method, the edge cleaning process of the panel is performed before the drying process, so that a good cleaning condition of the panel can be expected. That is, unlike the conventional method, the edges of the panel are cleaned before the phosphor is solidified, making cleaning the panel much easier. As a result, contamination of the table of the exposure apparatus, which comes into contact with the edge of the panel during the exposure operation, is prevented. Furthermore, since the panel can always be placed in close contact with the table of the exposure apparatus, the precision of the exposure work is improved.

As can be understood by comparing FIG. 1 and FIG. 2, the method for producing a fluorescent film according to the present invention has a shorter number of steps than the conventional method. This can reduce factory facility costs and improve product productivity.

[Brief explanation of the drawing]

FIG. 1 is a flowchart of a process for manufacturing a phosphor film for a cathode ray tube according to the present invention, and FIG. 2 is a flowchart for a process for manufacturing a phosphor film for a conventional cathode ray tube.

Claims (1)

[Claims] 1. Step of applying phosphor slurry, step of collecting surplus phosphor,
A method for manufacturing a phosphor film for a color cathode ray tube, which includes a panel edge cleaning step, a phosphor film exposure step, a phosphor film development step, etc., the phosphor slurry application step and the phosphor drying step; A method for producing a phosphor film for a color cathode ray tube, characterized in that a step of collecting surplus phosphor slurry and a step of cleaning the edge of the panel are carried out in sequence.