KR910005081B1 - A manufacturing method of a flourescent screen of color picture tube - Google Patents

Abstract

The manufacturing process comprises (1) injecting fluorescent material from aobe tube panel, while slowly rotating a slightly sloped panel, (2) doping fluorescent material on the inner side of panel, while fast rotating panel, (3) recovering excess fluorescent material in a recovery unit (centrifuge), (4) dryign the fluorescent layer with forcedly circulating air and heater, (5) exposing the layer to light, and (6) washign and developing fluorescent layer. The process can reduce inferior goods and energy consumption.

Description

How to make fluorescent screen of color CRT

1 is a flow chart of a fluorescent surface manufacturing process according to the present invention.

2 is a flow chart of a conventional general fluorescent surface manufacturing process.

The present invention relates to a method for producing a fluorescent surface of a color brown tube. The general manufacturing method of the fluorescent surface for the inner surface of the color-brown tube is the same as the process sequence outlined in FIG. 2 (the process is described in detail with reference to this). While a certain amount of one color phosphor is supplied to the inner surface thereof, the phosphor is applied to the entire inner surface of the panel, and then the panel is first cleaned and then ultrasonically cleaned. Then, the excess phosphor is applied to the inner surface of the panel while the panel is rotated at high speed, and the remaining phosphor is recovered, followed by the second drying operation of the fluorescent surface. Subsequently, the edge cleaning of the panel, that is, the remaining phosphor and other wastes attached to the edge of the panel in close contact with the funnel is washed out through the subsequent soft cleaning process. In addition, a predetermined fluorescent point is formed on the inner surface of the panel through an exposure process, and then washed.

This series of steps is repeated three times, because different phosphors must be applied separately. As described above in the conventional process, the soft cleaning of the panel is performed after two drying operations are performed, that is, after the fluorescent surface of the inner surface of the panel is completely dried. In addition, there is a fear that water splashing or foreign matter adhesion to the fluorescent film on the inner surface of the panel.

Accordingly, an object of the present invention is to provide a method for producing a fluorescent surface of a color CRT that can reduce the defective rate of the product and increase the performance in the production of the product.

In order to achieve the above object, the present invention, the process of recovering the excess phosphor followed by the phosphor coating process, and subsequent soft cleaning process to the process than the fluorescent film drying process, in particular, the drying of the fluorescent film has a variety of drying means different It is characterized in that it is made through the accompanying drying process.

Hereinafter, the present invention will be described in detail with reference to FIG. 1 of the accompanying drawings. In the first step, while the inner surface of the panel is inclined upwardly and slightly inclined, a predetermined amount of phosphor is injected from the upper panel while the panel is rotated at a low speed as a predetermined rotation means, and then the panel is rotated at high speed to expand the phosphor on the inner surface of the panel. . Then, as a second step, the panel is transferred to a conventional phosphor recovery apparatus, and then rotated at a high speed to recover the excess phosphor remaining on the inner surface of the panel using centrifugal force. As a third step, the remaining phosphors and foreign matter adhering to the edges of the panel by the phosphor recovery operation of the second step are washed with a conventional cleaning device. As a fourth step, the fluorescent film coated on the inner surface of the panel is heated and dried by various complex drying means by heated forced circulation air and radiant heat from a heater or the like. Subsequently, the subsequent exposure to the fluorescent surface and the development cleaning thereof are performed.

This series of processes is repeated for three phosphors.

According to the present invention, as described above, the edge cleaning state of the panel is good because the edge cleaning process precedes the drying process. That is, unlike the prior art, since the edges are washed before the phosphor solidifies, the state of washing is very good, and as a result, the edges of the panel that are well cleaned are brought into contact with the panel rest of the upper part of the exposure table during exposure. Contamination of the lining is prevented. Therefore, the accuracy of the exposure operation can be improved because the panel can always be placed in close contact with the resttable. On the other hand, as shown in FIG. 1 and FIG. 2, the fluorescent surface manufacturing method according to the present invention can reduce the number of manufacturing steps compared to the conventional method, thereby improving product productivity.

Claims (1)

It includes processes such as phosphor coating, excess phosphor recovery, soft cleaning, fluorescent film drying, fluorescent film exposure, and cleaning of the fluorescent film. Method for producing a fluorescent film of a color CRT, characterized in that to be carried out.

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