KR980011573A - Method of manufacturing a bulb having a panel manufactured by a dry electrophotographic method for manufacturing a cathode ray tube and a photovoltaic film solution - Google Patents

Abstract

The present invention relates to a dry electrophotographic manufacturing method of a cathode ray tube capable of satisfactorily removing volatile components such as a conductive film, a photoconductive film and a solvent existing in each phosphor and a lacquer in a process of sealing a panel and a funnel without a baking process of the panel A method for manufacturing a bulb having a panel made of the same, and a photoelectric film solution for the screen production. The photopolymer coating solution may contain bis dimethyl phenyl diphenyl buratriene, trinitro-fluorenone (TNF), ethyl anthraquinone (ethyl anthraquinone) : EAQ) in an amount of 0.01 to 10% by weight each, and 1 to 30% by weight of a styrene methyle methacrylate copolymer as a polymer binder in a residual amount of tolyene or xylene (xylene). Accordingly, in the process of sealing the panel and the funnel without the baking process of the panel manufactured by the dry electrophotographic screen manufacturing method, the volatile components such as the conductive film 32, the photoconductive film 34 and the solvent existing in each phosphor, It is possible to satisfactorily remove the baking process, and the baking process can be produced in the production of the bulb.

Description

Method of manufacturing a bulb having a panel manufactured by a dry electrophotographic method for manufacturing a cathode ray tube and a photovoltaic film solution

Since this is a trivial issue, I did not include the contents of the text.

The present invention relates to a method of manufacturing a bulb having a panel manufactured by a dry electrophotographic method for manufacturing a cathode ray tube and a photovoltaic coating solution for screen manufacturing thereof, and more particularly, to a method of baking a panel and a funnel in a process of sealing a panel and a funnel, The present invention relates to a method of manufacturing a bulb having a panel manufactured by a dry electrophotographic method for manufacturing a cathode ray tube and a photoelectric film solution for screen manufacture.

In general, the cathode ray tube comprises a vacuum bulb divided into a panel 12, a funnel 13 and a neck 14 as shown in Fig. 1, And a shadow mask 16 mounted on a side wall of the panel 12. The shadow mask 16 is provided on the side wall of the panel 12,

A fluorescent screen 20 is formed on the inner surface of the face plate 18 of the panel 12 so that the electron beams 19a and 19b emitted from the electron gun 11 are focused and accelerated by various lens systems, And deflected by the deflection yoke 17 and passed through the aperture or slot 16a of the shadow mask 16 and scanned onto the fluorescent screen 20. [

As shown in FIG. 2, a plurality of stripes or dot-shaped phosphors (R, G, B) having a constant arrangement structure may be formed on the rear surface of the face plate 18, And a light absorbing material 21 such as a black coating between the phosphors. In addition, an aluminum thin film layer 22 is formed as a conductive film layer on its back surface to increase the brightness of the fluorescent surface, to prevent ion damage on the fluorescent surface, and to prevent the potential drop of the fluorescent surface. Although not shown, a resin such as a lacquer is applied between the fluorescent screen 20 and the photoconductive film layer 34 in order to increase the flatness and reflectance of the aluminum thin film layer 22.

A conventional photolithographic wet process, in which such a fluorescent screen 20 is formed by applying and drying a slurry containing a fluorescent particle such as a coloring light toughening substance or a current liquid containing a light absorbing material, The manufacturing process and manufacturing facilities are complicated and the manufacturing cost is high. In addition, there are various problems such as consumption of a large amount of clean water, generation of waste water, emission of phosphorus, and discharge of hexavalent chromium photoconductor. Recently, there has been developed an electrophotographic screen manufacturing method of improving such a wet photolithography process. In this electrophotographic manufacturing process, the wet process still has the above-mentioned problems. According to the dry process, Were greatly resolved.

For example, a screen manufacturing method of a cathode-ray tube applied by the present applicant will be described as follows.

Figs. 3 (a) to 3 (e) schematically show each process according to the above-described production method. 3A is a coating process in which a conductive film 132 and a photoconductive film 134 are formed on the inner surface of the face plate 18. The conductive film 132 may be formed of, for example, an aqueous solution of 1-50% by weight of Catfloc-c (trade name, product of Calgon) as a polyelectrolyte and 1-50% by weight of a 10% And then drying it. And a new photopolymer coating solution containing a substance is applied on the substrate in response to ultraviolet rays to be dried. At least one of bisdimethyl phenyl diphenyl butatriene, trinitor-fluorenone (TNF), and ethyl anthraquinone (EAQ) is used as a substance that reacts with the hypothalamus. The photoconductive film coating solution was prepared by adding 0.01 to 10% by weight of bisdimethylphenyldiphenylbutytriene and 1 to 30% by weight of polystyrene as a polymer binder to toluene or xylene xylene).

FIG. 3B schematically shows a charging step. A DC voltage of + 1K volts or less, preferably +700 volts or more was applied to the corona discharge device. Since the photoelectric conversion film 134 responds to ultraviolet rays of at least 450 nm in wavelength, dark room operation is unnecessary.

3C schematically shows the exposure process. Ultraviolet rays having a short wavelength and a directivity from the self-luminous source 138 pass through the ultraviolet transmission lens 140 and enter the shadow mask 16 at a desired incident angle, The photoconductive film 134 is exposed in a desired arrangement through an aperture or slit 16a of the shadow mask 16 having the desired arrangement. At this time, the conductive film 132 is grounded, and the electric charges of the exposed portion are discharged through the conductive film 132. Then, the electric charge in the non-exposed portion remains in the photoconductive film 134 as it is. Since this exposure process uses the ultraviolet light source 138, it is not necessary to work in the dark room.

FIG. 3D schematically shows the developing process. Conventionally, in this developing process, the carrier beads and the phosphor particles or the light absorbing material particles are mixed to charge the static electricity caused by the friction. However, according to the invention of the present applicant, the fine powder such as the powder of the phosphor or the light- The fine powder is charged by passing the discharge electrode 144a and the nozzle 144b such as a corona discharge device through the venturi pipe 146 from the hopper 148 and discharging the exposed portion of the photoconductive film 134 and the non- Or < / RTI > The polarity of the static electricity charged to the fine powder by the discharge electrode 144a is determined according to which portion of the exposed portion and the non-exposed portion in the above-described exposure process the fine powder is to be attached. In other words, when the fine powder is adhered to the non-opaque portion with a positive charge, the fine powder is charged with the negative charge. When the fine powder is adhered to the exposed portion where the charge is discharged, the fine powder is charged with positive charge. The charged fine powder injected into the developing container 142 is strongly adhered to the surface of the photoconductive film 134 in a desired arrangement by the action of an electric attraction and a repulsive force.

3E schematically shows a fixing process according to the applicant's invention using a vapor swelling method. In this step, solvent vapor such as acetone or methyl isobutyl ketone is connected to the surface of the photoconductive film 134 to which the desired fine powder (s) are adhered in a desired arrangement in the above-described developing process, so that at least the photoconductive film 134 ), And the fine powder (s) attached to the electric force action is fixed by the adhesive force of the dissolved polymer.

FIG. 4 is a process diagram showing an example in which the above-described basic processes are applied to the R, G, and B phosphor screens of a color cathode ray tube. The panel 12 to be introduced therein may be formed with a light absorbing material 21 in a desired arrangement by a conventional wet screen manufacturing method, a dry screen manufacturing method, or a screen manufacturing method of the present invention described above on the inner surface of the face plate 18 It is fixed. However, it is not necessary that the light absorbing material 21 be formed first, and after fixing the phosphors described below, as in U.S. Patent No. 5, 240, 798, the light absorbing material 21 may be arranged in a desired arrangement And may be adhered and fixed by using a manufacturing method.

First, step S101 is a primary coating step, and step S102 is a secondary coating step, in which a photoconductive film 134 including a substance sensitive to ultraviolet rays is formed on the conductive film 132 as described above with reference to FIG. 3A, Then, in order to attach the first phosphor, the photoconductive film 134 is coated in step S103. And is charged as shown in FIG. 5B. The subsequent step S104 is a primary exposure step in which the desired first phosphor arrangement is exposed by the exposure process of FIG. 3C, and the primary exposed photoconductive film 134 is formed by the developing process of FIG. Lt; RTI ID = 0.0 > 1 < / RTI > phosphor arrangement. If the first phosphor is adhered in a desired arrangement in step S105 as the primary development step, it is not necessary to adhere the attached primary phosphor and the first phosphor is attached in the secondary charging step of step S106 for the second phosphor The photoconductive film 134 is recharged, that is, secondary charged. Thereafter, step S107 (secondary exposure) and step S108 (secondary development) are performed for the second phosphor, and the secondary charging is performed in step S109 without having to fix the second phosphor in the same manner. After the third charging is performed, step S110 (third exposure) and step S111 (third development) are performed in order to attach the third phosphor, and then, in step 112, the first, second, Is fixed on the photo conductive film 134 by a fixing process of (e). Thereafter, a lacquer resin is applied in step S113, and an aluminum film is formed in step S114. The conductive film 32, the photoconductive film 34, and the conductive film 34 are formed by heating and drying the panel 12 on which the aluminum thin film is to be formed through the aluminizing step S114 in the baking step of step S115 at 425 DEG C for about 30 minutes in the atmosphere, And volatile components such as solvents existing in the respective phosphors and lacquers are removed and the phosphors are fixed to obtain the desired screen 20. [ The panel 12 is then sealed with a frit glass in a panel 13, in which a shadow mask-frame assembly and an inner shield are assembled, an electron gun is assembled and an undergarment is applied, and the tube is sealed with a bulb of a cathode ray tube.

In the above, the screen manufacturing method of the cathode ray tube applied by the present applicant has been described. In the process of omitting the baking step of the step S115 described above and the sealing process of the panel 12 and the funnel 13, the conductive film 32, There are various problems in removing the volatile components such as the solvent existing in the coating film 34 and each phosphor and the lacquer. Particularly, there is a problem that the above-mentioned aluminum thin film is swollen or the polystyrene contained in the above-mentioned photo conductive film 134 is not volatilized.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a method of manufacturing a dry electrophotographic screen, in which a panel and a funnel are sealed, The present invention provides a method for manufacturing a bulb having a panel manufactured by a dry transfer photographic process of a cathode ray tube and a photovoltaic film solution for screen manufacture.

1 is a schematic plan view of a part of a color cathode ray tube,

FIG. 2 is a partially enlarged cross-sectional view showing a screen configuration of the cathode ray tube of FIG. 1,

FIG. 3 is a schematic view for explaining a method of manufacturing a dry electrophotographic screen,

FIG. 4 is a process for manufacturing a cathode ray tube using a dry electrophotographic screen manufacturing method,

FIG. 5 is a time-temperature curve graph in the baking process and the sealing process.

Description of the Related Art

10: cathode ray tube (CRT) 11: electron gun

12: Panel 13: Funnel

14: neck 15: anode button

16: shadow mask 17: deflection yoke

18: panel face plates 19, 19a, 19b: electron beam

20: fluorescent screen (screen) 21: light absorbing material

22: Racker film 23: Aluminum thin film layer

36: corona discharge device 132: conductive film

134: photoelectric conversion film 138: light source

140: Lens 142: Developing container

144a: discharge electrode 144b: nozzle

In order to achieve the above object, the present invention provides a method for forming a volatile electroconductive film on a volatile conductive film coated on the inner surface of a panel, charging the electroconductive film with uniform static electricity, And the first phosphor charged by the discharge electrode is adhered to and developed on the exposed portion of the first phosphor, and the charging step, the exposure step, and the developing step are performed in the desired arrangement on the second and third phosphors, respectively After the phosphor is repeatedly fixed, a panel assembly in which a shadow mask-frame assembly and an inner shield are assembled to a panel in which a locker resin film and an aluminum thin film are formed, and a frit glass assembly between an electron gun assembly and an inner dagger- And passing through the sealing furnace through the sealing furnace, wherein the panel is sealed by passing through the sealing furnace, And the photoconductive layer comprises 1 to 30% by weight of a styrene methyle methacrylate copolymer as a polymer binder.

The present invention also provides a method for forming a volatile electroconductive film on an inner surface of a panel by forming a volatile electroconductive film on the inner surface of the panel, charging the electroconductive film with uniform static electricity, passing the electroconductive film through a shadow mask as a light source, The charging step, the exposing step and the developing step are repeated in the desired arrangement for the second and third phosphors, respectively. After the charging step, the exposing step and the developing step are repeated in the desired arrangement, A panel assembly in which a shadow mask-frame assembly and an inner shield are assembled to a panel in which a locker resin film and an aluminum film are formed, and a frit glass interposed between the panel assembly and the funnel assembly, In a photovoltaic coating solution for dry electrophotographic production of a panel screen of bulb which is sealed and completed by passing, As the material, at least one of bis dimethyl phenyl diphenyl butatriene, trinitro-fluouenone (TNF) and ethyl anthraquinone (EAQ) is added in an amount of 0.01 to 10 wt. And 1 to 30% by weight of a styrene methyle methacrylate copolymer as a polymer binder is dissolved in a residual amount of toluene or xylene. The present invention provides a photovoltaic coating solution for the production of a dry electrophotographic screen.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. According to the present invention, a volatile conductive film is formed on the inner surface of a panel, and a volatile photoconductive film is formed thereon. A uniform static charge is charged on the photoconductive film by a corona discharge device or the like, The electrophotographic coating solution for screen production of an electrophotographic cathode ray tube in which the phosphor particles charged with electrostatically charged are discharged by discharging an organic solvent such as bis dimethyl phenyl diphenyl butatriene 0.01 to 10% by weight of at least one or more of trinitrofluorenone (TNTF) and ethyl anthraquinone (EAQ), 1 to 10% by weight of a styrene methyle methacrylate copolymer, To 30% by weight in the remaining amount of toluene or xylene.

In FIG. 5, conventionally, the baking process was heated and dried at 425 DEG C for about 30 minutes in the baking process as shown by the curve S2, but the sealing process was gradually heated in the sealing furnace (fritted furnace) (Frit temperature) for 35 to 40 minutes, and then slowly cooled in a furnace, the panel and the funnel are sealed by the frit glass to complete the bulb. Therefore, conventional polystyrene is used as the polymer binder, The polystyrene contained in the photoconductive layer 134 is not volatilized as described above. However, the photoconductive layer 134 of the present invention described above can be formed by the following steps: The methacrylate copolymer is used in the above sealing process when the aluminum foil is swollen or the styrene methyl methacrylate The number of process steps is shortened in the whole process for manufacturing bulbs because no problem is caused that the volumetric co-polymer does not volatilize.

In the styrene methyl methacrylate copolymer, polymethyl methacrylate and polystyrene form a copolymer as follows. In other words,

Polymethyl methacrylate Wow

Polystyrene For example,

. The polymethylmethacrylate has excellent unzipping characteristics and combustion characteristics, thereby reducing the above-mentioned problems occurring in the combustion of polystyrene.

The photoconductive film solution according to the present invention containing the styrene-methyl methacrylate copolymer thus constituted is formed on the electroconductive film 132 coated on the inner surface of the face plate 18 as described above with reference to FIG. 3B, the photoconductive film 134 is uniformly charged by the corona discharge device 36, and is exposed in a predetermined arrangement structure in FIG. 3C to form a predetermined And the phosphor powder is pneumatically injected from the hopper 148 through the venturi tube 146 and passed through the discharge electrode 144A and the nozzle 144b such as a corona discharge device And is developed by grinding. The thus developed panel is fixed using the Vapor Swelling method as shown in FIG. 3E (step S101 to step S112 for three-color phosphors in FIG. 4), and in steps S113 and S114, the locker resin film and the aluminum thin film And the shadow mask 16 and the like are assembled to the panel 12 without baking in step S115. The panel 12 assembled in this way is assembled with the funnel 13 in which the electron gun 17 and the like are assembled, It is loaded into the fixture through the frit glass and passes through the sealing furnace. In the sealing furnace, the panel 12 and the funnel 13 are gradually heated as shown by a curve S 1 in FIG. 5 and held at about 450 ° C. (fritting temperature) for about 35 to 40 minutes, followed by slow cooling in the furnace. The volatile components such as the conductive film 32 on the screen of the panel, the photoconductive film 34 and the solvent existing in the respective phosphors and the lockers are removed and a finished bulb is produced.

When methyl phenyl triphenyl butatriene is used in place of the bis dimethylphenyl diphenyl butatriene in the above-mentioned photo-electroconductive film solution, it is more soluble in toluene or xylene to prepare the photopolymer film solution Time is saved and workability is improved.

Further, since the above-mentioned trinitrofluoruron (TNF) is known as a carcinogenic substance, a safety problem arises. Thus, instead of using 2,5-bis (4-diethylaminophenyl) -1,3,4-oxadiazole [2,5-bis .

According to the manufacturing method of the bulb having the panel manufactured by the dry electrophotographic process with the cathode according to the present invention and the structure and function of the photopolymer coating solution used therefor, Volatile components such as a conductive film, a photoconductive film, and a solvent existing in each phosphor and a lacquer can be satisfactorily removed in the process of sealing the panel and the funnel without the baking process of the panel, thereby omitting the baking process .

While the present invention has been described in connection with certain exemplary embodiments thereof, it will be apparent to those skilled in the art that various modifications and variations are possible in light of the above teachings.

Claims (3)

A volatile photoconductive film is formed on the inner surface of the panel and a uniform static charge is charged on the photoconductive film, and the photoconductive film is selectively exposed through a shadow mask as a light source, The charging step, the exposure step, and the developing step are repeated in the desired arrangement for the second and third phosphors, respectively, and then the formed bodies are fixed A panel assembly in which a shadow mask-frame assembly and an inner shield are assembled to a panel in which a locker resin film and an aluminum thin film are formed, a panel assembly in which an electron gun is assembled and an inner guide plate is assembled, The method of manufacturing a bulb according to any one of claims 1 to 3, And 1 to 30% by weight of a styrene methyle methacrylate copolymer as a binder. The method for manufacturing a bulb having a panel made by the dry electrophotographic method of manufacturing a cathode ray tube . A volatile photoconductive film is formed on the inner surface of the panel and a uniform static charge is charged on the photoconductive film, and the photoconductive film is selectively exposed through a shadow mask as a light source, And the second and third phosphors are repeatedly subjected to the charging step, the exposure step and the developing step in a desired arrangement, and then the phosphors are fixed, A panel assembly in which a shadow mask-frame assembly and an inner shield are assembled and a panel assembly in which an electron gun is assembled and a funnel assembly on which an inner dag is applied are passed through a frit glass through a sealing furnace, In the photovoltaic coating solution for the dry electrophotographic production of the panel screen of a bulb, 0.01 to 10% by weight of at least one or more of bis dimethyl phenyl dimethyl butatriene, trinitro-fluouenone (lTNF) and ethyl anthraquinone (EAQ) , And a polymer binder in which 1 to 30% by weight of a styrene methyle methacrylate copolymer is dissolved in a residual amount of toluene or xylene, Photopolymer coating solution for photographic screen manufacturing. 3. The cathode ray tube of claim 2, wherein the photosensitive material is a methyl phenyl phenyl triphenyl butatriene in an amount of 0.01 to 10% by weight instead of the bis dimethyl phenyl diphenyl butadiene. Coating solution. ※ Note: It is disclosed by the contents of the first application.