KR970030148A - Method for manufacturing screen of cathode ray tube and cathode ray tube - Google Patents

Abstract

The present invention relates to a method for producing a color cathode ray tube and a cathode ray tube thereby.

After the coating-charging-exposure-developing step is carried out by a conventional method, an organic solvent for dissolving the polymer binder component of the photoconductor film is sprayed onto the photoconductor film, so that phosphor particles are dissolved in the polymer binder of the photoconductor film. It provides a method for producing a dry electrophotographic screen of a color cathode ray tube, characterized in that it comprises a fixing step of being embedded into the polymer binder component of the dissolved photoconductive film soaks up the phosphor particles to form a thin film.

The present invention utilizes dissolution of the polymer rather than heat fusion in the fixing process, which requires less energy than in the prior art, and also firmly fixes each phosphor particle in the photoconductor film in the fixing process and simultaneously on the surface of the phosphor particle. Since a thin and smooth film is formed, a separate lacquer film process can be omitted after that.

Description

Method for manufacturing screen of cathode ray tube and cathode ray tube

As this is a public information case, the full text was not included.

5 is a schematic cross-sectional view of the screen shown to show a state that the phosphor particles after the development step is attached to the face plate of the screen.

5B is a schematic cross-sectional view of a screen showing one of the preferred embodiments of the present invention.

Figure 5 (c) is a schematic cross-sectional view of the screen with the lacquer process omitted by the present invention.

6 is a process chart showing a preferred embodiment of the dry electrophotographic screen manufacturing method according to the present invention.

Claims (7)

(1) a primary coating step of forming a volatile conductive film on the inner surface of the panel; (2) a secondary coating step of forming a volatile photoconductive film on the conductive film; (3) a charging step of charging a uniform electrostatic charge on the photoconductive film; (4) an exposure step of exposing light (light) through a shadow mask so as to selectively emit the electrostatic charge of the photoconductive film; (5) a developing step of attaching a charged fine portion to any one of an exposed portion of the photoconductive film selectively exposed by the electrostatic charge by exposure and a non-exposed portion of the remaining photoconductive film; In the developing step (5), the charging step (3), the exposure step (4) and the developing step (5) are repeatedly carried out to form a desired arrangement for the fine powder of each of the first, second and third phosphors. In the dry electrophotographic screen manufacturing method of a color cathode ray tube, After the developing step (5), an organic solvent for dissolving the polymer binder component of the photoconductor film is sprayed onto the photoconductor film, embedded in the polymer binder of the photoconductor film in which the phosphor particles are dissolved, and the polymer binder component of the dissolved photoconductor film. A method of manufacturing a dry electrophotographic screen of a color cathode ray tube, characterized in that it comprises a fixing step of penetrating the phosphor particles to form a thin film. The method according to claim 1, wherein the organic solvent is used by selecting an appropriate solvent according to the polymer binder component of the photoconductive film. The organic solvent according to claim 1, wherein any one of acetone, methylisobutylketone, benzene, colobenzene, ethylbenzene, toluene, xylene, ester, or mixtures thereof is used when the polymer binder component of the photoconductive film is polystyrene. Dry electrophotographic screen manufacturing method of a color cathode ray tube, characterized in that. The method for producing a dry electrophotographic screen of a color cathode ray tube according to claim 1, wherein the organic solvent is toluene. The method of claim 1, wherein the fixing step is a fixing step in which the injection pressure of the organic solvent is performed at a low pressure within a range smaller than the adhesion force of the phosphor particles attached to the photoconductive film by electrostatic attraction, and after the fixing step, The color cathode ray is characterized in that it comprises a complete fixing step of completely fixing the temporarily fixed phosphor particles to the polymer binder in the photoconductor film and forming a thin film of the polymer binder on the surface of the phosphor particles. Method for producing a dry electrophotographic screen of a tube. Forming a volatile photoconductive film on the volatile conductive film on the inner surface of the panel, charging a uniform electrostatic charge on the photoconductive film, selectively exposing the charged photoconductive film using light and a shadow mask, and the exposed portion After adhering the first phosphor particles charged thereon, the organic solvent of the polymer binder of the photoconductive film is sprayed onto the photoconductive film, and the first phosphor particles are embedded in the polymer binder of the photoconductive film in which the first phosphor particles are dissolved. A polymer binder component penetrates over the phosphor particles to form a thin film, and after the same process described above with respect to the second and third phosphor particles, the cathode ray tube is manufactured by anodizing and baking. Forming a volatile photoconductive film on the volatile conductive film on the inner surface of the panel, charging a uniform electrostatic charge on the photoconductive film, selectively exposing the charged photoconductive film using light and a shadow mask, and the exposed portion After adhering the charged first phosphor particles to the first phosphor particles, the attached first phosphor particles were low-pressure sprayed with an organic solvent of the polymer binder of the photoconductive film, and then temporarily fixed. Then, the second phosphor and the third phosphor were sequentially and repeatedly charged, respectively. After exposure, development, and temporary fixation, the organic solvent of the polymer binder of the photoconductive film is high-pressure sprayed onto the photoconductive film, and then embedded in the polymer binder of the photoconductive film in which the first and second phosphors and the third phosphor, which are temporarily fixed, are dissolved. The polymer binder component of the photoconductive film dissolved therein is thinned out through the first phosphor, the second phosphor, and the third phosphor. Thereby forming the, cathode ray tube, characterized in that after its being manufactured through the anodized customizing and baking process.