MXPA97007975A - Liquid coating nozzle, method for manufacturing the liquid coating nozzle, liquid coating method, liquid coating apparatus and method for manufacturing a cathode ray tube - Google Patents

Abstract

The present invention relates to a nozzle for coating an object with a liquid, which comprises: a first block, having an internal liquid reserve section, which extends in its longitudinal direction, and an internal discharge section, which is formed in a bottom portion of said internal liquid reserve section, which extends in the longitudinal direction, said internal discharge section includes a plurality of holes or a slit, so as to form an outlet of the internal discharge section and a second block, which has an internal gas reserve section, which extends in the longitudinal direction and an external discharge section, which is formed in a bottom portion of the internal gas reserve section and the which extends in the longitudinal direction, said external discharge section has a plurality of holes formed in a slit, so as to form an outlet of said external section of the outlet. arga, in which said first block is placed inside the second block, so that said outlet of the internal discharge section moves further away from the position where the object is to be coated than a portion of said outlet of the external discharge section , closer to said internal discharge section, so that the liquid flowing from said internal liquid reserve section, through the internal discharge section, is surrounded by the gas flowing from said internal gas reserve section, through of said external section of decar

Description

LIQUID COATING NOZZLE. METHOD FOR MANUFACTURING THE LIQUID COATING NOZZLE - LIQUID COATING METHOD. LIQUID COATING APPARATUS AND METHOD FOR THE MANUFACTURE OF A CATHODE RAY TUBE TECHNICAL FIELD The present invention relates to a liquid coating nozzle, a method for manufacturing it, a liquid coating method and a liquid coating apparatus to form a thin film of this coating on an "Object, which is desired coating, such as a cathode ray tube, a semiconductor substrate, a liquid crystal substrate and a substrate for an optical disc The present invention also relates to a method for making a cathode ray tube, as an application of the invention. Specifically, the present invention relates to a nozzle and a color CRT (cathode ray tube), capable of making a phosphor surface, whose coating pattern has a uniform quality at a higher level, and supplying a high luminance image PREVIOUS TECHNIQUE For example, three kinds of imaging elements of a phosphoric substance are formed to supply the color red, green and blue, on a phosphoric surface of the inner surface of a glass panel of a cathode ray tube. These image elements are arranged regularly in a dot or strip manner, by means of a photo-adsorption film, which is named a black matrix. In the case where such phosphoric image elements are formed by coating, a liquid coating apparatus is used. The fabrication of the phosphoric surface will be described as follows. First, a photosensitive resin film is formed on an inner surface of a glass panel of a cathode ray tube. In positions for forming the elements of a phosphoric image in a portion where the photosensitive resin film is formed, a phosphoric forming section is fabricated through a coating of photoreactive material, and exposure and development. The photolithography technique is used for the manufacture of the phosphoric formation section. Next, a phosphoric suspension (hereinafter referred to as an aqueous paste) is coated on the inner surface of the panel. A section of phosphoric formation of a specific color required by a similar photolithography technique is manufactured. The coating for forming the phosphoric surface of the cathode ray tube is carried out mainly by a rotating coating, in which the aqueous paste is coated on the panel, while rotating this panel. Such a rotary coating is described below. First, an aqueous paste, in which a phosphoric substance is suspended in a photosensitive resin, is emptied onto the inner surface of the panel, which rotates at low speed. The emptied aqueous paste gradually extends over the internal surface of the panel, due to the inclination and rotation of the panel, while the phosphoric substance precipitates. It is important to obtain a uniform coating film without an uneven coating in the process of coating the phosphoric substance. For this purpose, a method for periodically changing the turning angle of the panel in synchronization with the rotation period of the panel has been proposed (for example, Japanese Unexamined Patent Publication No. 3-122944) and a method for carrying out the regular and inverse rotations of the panel (for example, Japanese Unexamined Patent Publication, No. 5-101775). Next, the panel is rotated at a higher speed to transfer to the process of shaking and detaching the superfluous liquid. In order to obtain a uniform coating film, it is important to adjust the turning angle and the number of revolutions of the panel in the shaking and detachment operation. Then, a method has already been proposed to shake the panel with this panel placed diagonally upwards (for example, Japanese Unexamined Patent Publication No. 55-57230) and a method for shaking the panel, with the panel placed diagonally downward (for example Japanese Unexamined Patent Publication No. 59-186230). In this process, the superfluous aqueous paste is discharged out of the panel. Next, the coating film is heated by an external infrared heater to dry it. Then, a shadow mask is adjusted and subjected to exposure to ultraviolet light. The irradiation of ultraviolet light allows the photo-entanglement reaction to progress between a photosensitive resin and a photo-initiator, while an exposed portion is insolubilized to water. After the exposure, the shadow mask is removed and the development is carried out by wetting with hot water, etc., to wash the unexposed portion with water, thus forming a pattern of the phosphoric substance only in the required portion. Through the above processes, a phosphoric surface of the cathode ray tube is completed. On the other hand, in accordance with the change of the Office Automation environment, the requirements for the display of a cathode ray tube are changed variably in the technical consequences, such as to make it of high fine accuracy, high luminance and High contrast with the ideal conditions of the demonstrations. Since it is difficult to see a screen of a cathode ray tube, which has a conventional curvature, due to the irregular reflection of the external light, thus increasing the requirement to make the configuration of the screen completely flat. Likewise, a high luminance and high resolution is required in any portion in the central portion and the peripheral portion of the exhibition that uses the cathode ray tube, due to the development of the Office Automation environment. In order to fulfill the requirement in an improved manner, for example, a method was proposed in which, in the formation of the phosphoric surface, an aqueous paste is linearly coated in a short time on an inner surface of the glass panel. However, the methods described above have the following consequences. (1) Conventional methods of coating the aqueous paste require a small amount of this aqueous paste, in order to spread it over the effective surface of the panel, adjusting the inclination and the number of revolutions of the panel. Therefore, an excessive amount of aqueous paste causes splashing of the liquid and the inclusion of bubbles. There is a difference in the thickness of the film due to the pressing flow of the aqueous slurry from the central portion to its peripheral portion by the inclination of the panel. (2) In the case where an aqueous paste is linearly coated, it is very difficult to coat in a laminar flow in the panel a coating liquid which is discharged from the coating nozzle. Therefore, for example, a lateral splashing phenomenon is caused where the liquid is discharged in a direction perpendicular to the direction of sweep of the nozzle, so the uncoated portions are left on the inner surface of the panel. It is an object of the present invention to provide a novel nozzle for downward flow of the liquid in a linear or curtain configuration, to provide a method for efficiently fabricating the novel nozzle with high accuracy and to provide a liquid coating method and apparatus for use the new mouthpiece Another object of the present invention is to provide a method of manufacturing a cathode ray tube, capable of forming a film of uniform thickness, of low cost, in a short time, while suppressing the consumption of the necessary liquid. Another object of the present invention is to provide a liquid coating nozzle and a method of making a cathode ray tube, in which, by the use of the coating nozzle to linearly flow down a liquid and optimize the program of coating the formation of the surface of phosphoric substance (screen process of the phosphoric substance), a phosphoric surface, whose coating pattern has a uniform quality, can be carried out at a higher level, and a high luminance cathode ray tube can be supplied. EXPOSITION OF THE INVENTION In order to achieve the above object, the present invention is constructed as follows. According to a first aspect of the present invention, a liquid coating nozzle is provided for coating a liquid on an object, which is desired to be coated, this nozzle comprises: a first block, which has an internal reserve section of liquid, extending in its longitudinal direction and an internal section of discharge in the longitudinal direction in a bottom portion of the liquid reserving section, the internal discharge section is comprised of a plurality of small holes or a slit; and a second block, which has an internal space defining a gas reserve section, extending in the longitudinal direction away from the first block and an external discharge section, formed in the longitudinal direction in a bottom portion of the space internally, the external discharge section is comprised of a plurality of small holes or a slit and which forms a gas flow externally surrounding a flow of linear or curtain-shaped fluid, flowing downwardly from the internal discharge section. According to a second aspect of the present invention, a liquid coating nozzle is provided, as defined in the first aspect, in which the first and second blocks are each comprised of bisected bodies, divided by a vertical plane, which It expands in the longitudinal direction, through a center across the internal section of discharge. According to a third aspect of the present invention, a liquid coating nozzle is provided, as defined in the first or second aspect, in which the configuration of each of the small holes, which constitute each of the internal section of discharge and the external discharge section, is an elongated hexagon. According to a fourth aspect of the present invention, a liquid coating nozzle is provided, as defined in any of the first to the third aspects, wherein the liquid reserve section has a sloping surface on the bottom of which the section is placed. internal download.

According to a fifth aspect of the present invention, a liquid coating nozzle is provided, as defined in any of the first to fourth aspects, in which the gas reserve section has a sectional configuration which becomes so large as possible, as long as a required resistance is maintained. According to a sixth aspect of the present invention, there is provided a method of manufacturing a liquid coating nozzle for manufacturing a nozzle for coating with a liquid an object to be coated, the method comprising: a first block having a internal liquid reserve section, extending in its longitudinal direction and an internal discharge section, formed in the longitudinal direction in a bottom portion of the liquid reserve section, the internal discharge section comprises a plurality of small holes or a crack; and a second block, which has an internal space defining a gas reserve section, extending in the longitudinal direction to the exterior of the first block and an external discharge section formed in the longitudinal direction in the bottom portion of the space internal, the external discharge section is comprised of a plurality of small holes or a slit, and forms a gas flow externally surrounding a flow of linear or curtain-shaped fluid, flowing downward from the internal discharge section, in which the first block and the second block are each comprised of bisected bodies, divided by a vertical plane, which expands in the longitudinal direction through a center across the internal discharge section and this internal section of discharge and / or the external discharge section is comprised of a plurality of small holes, the method comprises: placing two bisected bodies, which have been p pre-roughened, with a slot-like space, which serves as a liquid reserve section and / or the gas reserve section, so that an aperture plane in the slot-like space defines an identical plane; and then, concurrently cut small slots to form the small holes of both bisected bodies, whereby the process of small holes is performed. According to a seventh aspect of the present invention, a liquid coating method is provided for coating a liquid on an object to be coated, by a liquid coating nozzle, this method comprises: using the nozzle, as defined in any of the first to the fifth aspects, to obtain the external discharge section that faces the object to be coated, and then discharge the flow of the liquid in a linear or curtain-like configuration, while discharging the gas flow towards the object to be coated, through the external discharge section; and moving the object to be coated and the nozzle relative to each other, in a direction which intercepts the longitudinal direction, while discharging the liquid. According to an eighth aspect of the present invention, a liquid coating method for coating a liquid on an object to be coated is provided by a liquid coating nozzle, as defined in the seventh aspect, which further comprises : discharging a superfluous liquid from the object to be coated, while turning and rotating the object to be coated, after this object to be coated and the nozzle move relative to each other; and then, dry the coated liquid on the object to be coated. According to a ninth aspect of the present invention, a liquid coating apparatus is provided for coating liquid on an object to be coated, this apparatus comprises: the nozzle defined in any of the first to fifth aspects; and a relative motion device, to move at least one of the nozzle and the object to be coated, which faces the nozzle, in a direction which intercepts the longitudinal direction. According to a tenth aspect of the present invention, a liquid coating apparatus is provided, as defined in the ninth aspect, which further comprises: a liquid circulation passage, for supplying, in a circulating manner, the liquid to the liquid reserve section; and an opening and closing element, for opening and closing the liquid circulation passage. According to the eleventh aspect of the present invention, a liquid coating apparatus is provided, as defined in the ninth or tenth aspect, which further comprises: a rotating mechanism and a tumbling mechanism, for discharging a superfluous liquid from the object to be coated, while turning and rotating the object to be coated, after this object and the nozzle move relative to each other by the device of relative movement; and a drying device, for drying the coated liquid on the object to be coated.

According to the twelfth aspect of the present invention, a liquid coating nozzle is provided, in which a plurality of discharge holes are arranged linearly and when this discharge hole has a length D, in the direction of sweep of the nozzle, and a guide section of the liquid, inside the nozzle, has a length L, a ratio of 1 < L / D < 10. In accordance with the thirteenth aspect of the present invention, a liquid coating nozzle is provided, as defined in the twelfth aspect, in which the length D of the discharge hole, in the direction of sweep of the nozzle , is greater than the length d thereof, in the direction perpendicular to the direction of sweep of the nozzle. According to a fourteenth aspect of the present invention, a liquid coating nozzle is provided, as defined in the twelfth or thirteenth aspect, in which, when the discharge hole has the length D, in the direction of sweep of the nozzle and the liquid guide section, inside the nozzle, has the length L, a ratio of 3 is maintained < L / D < _8. According to the fifteenth aspect of the present invention, there is provided a method for manufacturing a cathode ray tube, for coating coating materials by the phosphoric screen process, on a glass panel, with the use of a coating nozzle. liquid, in which a plurality of discharge holes are arranged linearly, when the discharge hole has a length D in the direction of sweep of the nozzle and a liquid guide section within the nozzle has a length L, is maintained the ratio of 1 < L / D < 10, This method comprises: barrier coating nozzle in the direction of the short side or in the direction of the longest side of the glass panel; and thus linearly coating the coating materials for the phosphoric screen process, over the area formed by this phosphoric screen of the glass panel. According to the sixteenth aspect of the present invention, there is provided a method of making cathode ray tube, as defined in the fifteenth aspect, in which a front surface of the glass panel is disposed substantially parallel to a horizontal axis in the coating of the liquid. According to the seventeenth aspect of the invention, a method for manufacturing a cathode ray tube is provided, as defined in the fifteenth or sixteenth aspect, in addition the coating also comprises: expanding the coating materials for the phosphoric screen process over the entire surface of the screen area of the glass panel, while causing the glass panel to have a rotation speed of 30 to 60 rpm, after coating; Next, download the superfluous coating materials, for the phosphoric screen process, while adjusting the rotation speed of the glass panel at 50 to 150 rpm and adjust the turning angle? of the glass panel at 90 to 115 degrees relative to the horizontal axis; and then, drying the film of the phosphoric substance, formed by the coating liquid, while adjusting the rotation speed of the glass panel at 10 to 150 rpm. According to a eighteenth aspect of the present invention, a method for the manufacture of cathode ray tubes is provided, as defined in any of the fifteenth to seventeenth aspects, in which the area of the glass panel screen has a configuration completely flat. According to the nineteenth aspect of the present invention, a method of manufacturing the cathode ray tube is provided, as defined in any of the fifteenth to eighteenth aspects, in which a nozzle is used where the length D of the discharge hole in the direction of sweep of the nozzle is greater than the length d thereof in the direction perpendicular to the direction of sweep of the nozzle. According to a twentieth aspect of the present invention, a method is provided for the manufacture of a cathode ray tube, as defined in any of the fifteenth to nineteenth aspects, in which a nozzle is used which, when the discharge hole has the length D in the scanning direction of the nozzle and the guide section of the liquid, inside the nozzle, has the length L, the ratio of 3 <is maintained; L / D < 8. BRIEF DESCRIPTION OF THE DRAWINGS These and other aspects and features of the present invention will become clear from the following description, taken in conjunction with their preferred embodiments and with reference to the accompanying drawings, in which: Figure 1 is a perspective view showing the construction of a liquid coating nozzle of a first embodiment of the present invention; Figure 2 is a sectional view of the nozzle of the first embodiment; Figure 3 is an enlarged cross-sectional view of a part of the nozzle of the first embodiment; Figure 4 is an enlarged view in longitudinal section of a part of the nozzle of the first embodiment; Figure 5 is a bottom view of the nozzle of the first embodiment; Figure 6 is a perspective view showing a stage in which a first nozzle block of the first embodiment is manufactured; Figure 7 is a perspective view showing a stage in which the second nozzle block of the first embodiment is manufactured; Figure 8 is a perspective view of a disassembled portion of the first embodiment; Figure 9 is a perspective view of a disassembled portion of the first embodiment; Figure 10 is a perspective view of the nozzle of the first embodiment, with a part removed and illustrated in cross section; Figure 11 is a bottom view of a nozzle of a second embodiment of the present invention; Figure 12 is an enlarged sectional view of a portion X-X of the second embodiment; Figure 13 is a perspective view showing the construction of a liquid coating apparatus of a third embodiment of the present invention; Figure 14 is a side view of the third embodiment with a part illustrated in cross section; Figure 15 is a sectional view of a nozzle of an eleventh embodiment; Figure 16 is a sectional view of a nozzle of a modification of the eleventh embodiment; Figure 17 is a bottom view of the small holes of the nozzle, according to the modifications; Figure 18 is an explanatory view showing a condition of a glass panel, when the coating is carried out by the nozzle of the embodiment of the present invention; Figure 19 is an explanatory view showing a condition of a glass panel, when the superfluous liquid is discharged and the desired operations are carried out in the embodiment of the present invention; Figure 20 is a schematic view showing a tumbling mechanism and a rotating mechanism of the glass panel; Figure 21 is a flow diagram of the coating processes, spread of the phosphoric substance, superfluous liquid discharge and drying, by means of the nozzle of one embodiment of the present invention; Figures 22A, 22B and 22C are a front view, a bottom view and a side view, respectively, of the coating nozzle of the thirteenth embodiment of the present invention; Figure 23 is a schematic view showing one embodiment of an aqueous paste coating method of the fourteenth embodiment of the present invention; Figure 24 is a view showing an example of a coating pattern of an aqueous paste of a comparative example; Figures 25A, 25B and 25C are a front view, a bottom view and a side view, respectively, of a conventional coating nozzle; and Figure 26 is a view showing an example of a coating pattern of an aqueous paste of a comparative example. BEST MODE FOR CARRYING OUT THE INVENTION Before the description of the present invention proceeds, it will be noted that similar parts are denoted by like reference numbers in all accompanying drawings. First, the embodiments of the present invention will be described schematically.

According to a liquid coating nozzle of one embodiment of the present invention, a liquid is discharged into the liquid reserve section from the internal discharge section, and a gas is discharged into the gas reserve section from the external discharge section, thus forming a gas flow that externally surrounds a liquid flow of linear or curtain configuration that flows downward from the internal discharge section. Therefore, the liquid flows directly downward without deviating in its direction of movement of the nozzle, to reach the surface of the object to be coated without irregularities. When the internal discharge section and the external discharge section are comprised of small holes, a gas flow is formed, which cylindrically surrounds the linear liquid flow and, therefore, the liquid flows directly downwards without deviating in the flow. direction of movement or in the lateral direction of the nozzle. According to a liquid coating nozzle of another embodiment of the present invention, the configuration of each of the small holes, which constitute the internal discharge section and the external discharge section, is that of an elongated hexagon. Therefore, each of the liquid flow and the gas flow flowing down as a rotary flow, so that they are deflected hard to the sides. According to a liquid coating nozzle of another embodiment of the present invention, the liquid reserving section has inclined surfaces on the bottom of which the internal discharge section is placed. Therefore, in the liquid reserve section, the liquid falls sliding along its inclined surfaces and is discharged from the internal discharge section. Accordingly, even when the liquid contains particles of a pigment or the like, the precipitated particles fall along the inclined surfaces and are not lodged within the liquid reserve section. According to a liquid coating nozzle of another embodiment of the present invention, the sectional configuration of the gas reserve section is made as large as possible, as long as the required resistance is maintained, therefore, the resistance of the first block is secured and the difference of the gas pressure in the liquid reserve section, between one side and another, in the longitudinal direction, is reduced, so that the discharge of the gas from the external discharge section is stabilized . One method of manufacturing a liquid coating nozzle of another embodiment of the present invention is the method of manufacturing the nozzle of the embodiments, wherein the first block and the second block are each comprised of the bisected bodies divided by the vertical plane that expands in the longitudinal direction through the center across the internal discharge section, and the internal discharge section and / or the external discharge section are comprised of a number of small holes, the process of Small holes are made by placing two bisected bodies that have been processed preparatoryly with the slot-like space, which serves as the liquid reserve section and / or the gas reserve section, so that the opening plane of the space in Slot shape defines an identical plane and concurrently cuts the small grooves to form the small holes of both bisected bodies. Therefore, when the two bisected bodies are coupled together to form the first block and the second block, the small grooves of the bisected bodies fit tightly together, thus forming small holes. According to the liquid coating method and the liquid coating apparatus of one embodiment of the present invention, the outer discharge section of the nozzle of the embodiments is made to face the object to be coated and at least one of the object to be coated and the nozzle are moved relative to each other in the direction that intercepts the longitudinal direction, when the flow of the liquid is discharged in a linear or curtain-like configuration, while discharging the gas flow to the object to be coated through the external discharge section. Therefore, by adjusting the amount of liquid discharge, a thin and uniform coating film, which has reduced coating irregularities, can be formed in a short time, while the consumption of the liquid is suppressed. According to the liquid coating method and the liquid coating apparatus of one embodiment of the present invention, the discharge section of the nozzle of the modes is made to face the object to be coated and at least one of the object which is to be coated and the nozzle move relative to each other, in the direction that intercepts the longitudinal direction, when the flow of the liquid is discharged in a linear or curtain-like configuration, towards the object to be coated, through of the download section. Therefore, by adjusting the discharge amount of the liquid, a thin coating uniform film, having reduced coating irregularities, can be formed in a short time, while the consumption of the liquid is suppressed.

The liquid coating apparatus of one embodiment of the present invention is provided with a liquid circulation passage for supplying, in a circulating manner, the liquid to the reservoir section of the liquid, as well as the opening and closing element. , to open and close the flow passage of the liquid. With this arrangement, the circulation of the liquid can be carried out or stopped. Therefore, the circulation of the liquid can be stopped while the liquid is discharged, thus allowing the pressure to be stabilized, and the circulation of the liquid can be made while the discharge of the liquid is stopped, thus preventing the precipitation of the particles. Next, the above embodiments are explained in detail with reference to the drawings. First Mode Figure 1 is a perspective view showing a part of a liquid coating nozzle, according to a first embodiment of the present invention, while Figure 2 is a sectional view thereof. In Figure 1, a liquid coating nozzle 4 is provided with a first block 41 and a second block 42. The first block 41 is elongated and has a configuration in approximately T-section (Figure 2), where its longitudinal end is tapered, and is provided internally with a liquid reserving section 42, extending in the longitudinal direction. The liquid reserve section 43 is formed in a long tunnel, which extends in the longitudinal direction of a nozzle 4. In the bottom portion (in a longitudinal end portion of the letter T) of the reservoir section 43 liquid, an internal discharge section is formed comprised of a number of small holes 44 in the longitudinal direction of the first block 41, as also shown in Figures 4 and 5. The length of the line of the small holes 44 can be made sufficiently long that the longitudinal or lateral direction of a glass panel section (not shown) of the maximum size of the object to be coated, the length is capable of being, for example, 600 mm. or 1000 mm. The second block 42 is elongated and has a sectional configuration of approximately one U (Figure 2), and fits firmly to the lateral end surfaces of the first block 41, so as to allow the gas to pass and have an internal space that forms a gas reserve section 46 to the exterior of the first block 41. As also shown in Figures 3 to 5, an external discharge section, comprised of a number of small holes 48, formed in positions just below the other small holes 44, is formed in the longitudinal direction of the second block 42 in the bottom portion of the internal space. When the small holes 48 become larger than the small holes 44, a flow of liquid, discharged from the small holes 44, easily passes through the small holes 48. The small holes 44 and 48 can each be formed in one variety of configurations of, for example, a round hole, an ellipse hole, a polygonal hole, a star-shaped hole or an irregularly shaped hole. Taking into account the point at which each of the discharged liquid flow and the gas flow tend to flip, each small hole can preferably be a hexagonal hole, more preferably an elongated hole, and most preferably an elongated hexagonal hole. In the case of an elongated small hole, the ratio of each small hole in the longitudinal direction (the ratio in the widthwise direction (smallest diameter) of the small hole, to the longest diameter of the small hole) is, for example, from 1/1 to 1/3 and more preferably from 1/1 to 1/2. When the longitudinal direction of the elongate small hole coincides with the longitudinal direction of the nozzle, the accuracy of the small hole process can easily be increased (particularly in the case of a block comprised of bisected bodies). The size of each of the small holes 44 and 48 is, for example, around 0.5 to 8 mm. , in terms of a distance between the centers of the adjacent small holes. Taking into account the point that the discharged liquid reaches the surface of the object to be coated and flows laterally to be coated uniformly as it merges with the adjacent hole, the size is preferably 0.5 to 1 mm. It can be run to form 600 small holes 44 and 48 at a distance of 1 m. between the centers of the adjacent small holes 44 and makes them correspond to a section of 6000 mm glass panel. or they form 1000 small holes and make them correspond to a section of 1000 mm glass panel. It will be noted that although the distance between the centers of the small holes 44 and 48 is constant, when the nozzle 4 is arranged so that the longitudinal direction of the nozzle 4 is inclined with respect to the longitudinal direction or the lateral direction of the object that the nozzle 4 is to be coated and moved in parallel with the longitudinal direction or the lateral direction of the object to be coated in this state, the interval between the linearly discharged liquids can be adjusted arbitrarily by changing the angle of inclination.

The first block 41 is comprised of bisected bodies 41a and 41b divided by a vertical plane that expands in the longitudinal direction through the centers across the width of the small holes 44 that serve as the internal discharge section. The second block 42 is also comprised of bisected bodies 42a and 42b divided by a vertical plane that expands in the longitudinal direction through the centers across the width of the small holes 48. The liquid reserve section 43 has sloped surfaces 43a in which bottom the small holes 44 are placed. This inclined surface 43a preferably has a greater inclination with respect to the plane perpendicular to the vertical plane, because the inner liquid flows easily downwards to the small holes 44. Likewise, in order to to prevent the occurrence of a difference in the amount of liquid discharge between a lateral end and the other lateral end of the liquid reserve section 43, it is preferable to make the area in section as large as possible. In order to make the sectional area of the liquid reserving section 43 as large as possible, the inclined surface 43a preferably has a steep inclination. Taking into account the arrangement where the liquid flows easily down along the inclined surface 43a and the arrangement where the sectional area of the liquid reserve section 43 becomes as large as possible, the inclined surface 43a preferably has An angle not less than 75 degrees and not greater than 90 degrees, with respect to the plane perpendicular to the vertical plane. In order to prevent the occurrence of the difference in the amount of gas discharge between one end side and the other end side of the gas reserve section 46, it is preferable to make the sectional area of the reserve section 46 gas as large as possible. Also, in order to make the sectional area of the gas reserve section 46 as large as possible, it is preferable to make the thickness of the first block 41 and the second block 42 as thin as possible. It will be noted that, according to the thickness of the first block 41 and the second block 42 become thinner, the first block 41 and the second block 42 can swell or shrink to vary the sectional area of the reserve section 43 of the liquid or the gas reserve section 46 or vary the widths of the small holes 4 and 48, which results in the change of the discharge amount. In order to prevent vibrations, it is preferable to maintain the required strength of the first block 41 and the second block 42. Taking into account the arrangement that the sectional area of the gas reserve section 46 is made as large as possible and the In order that the resistance of the first block 41 and the second block 42 be maintained, the sectional configuration of the gas reserve section 46 is preferably made as large as possible while maintaining the required resistance. When the surface of the gas reserve section 46 on the first side of the block is an inclined surface less pronounced than the inclined surface 43a rather than being parallel to this inclined surface 43a of the liquid reserve section 43, the portion that has a greater thickness has a reinforcing effect, allowing the required strength to be maintained. It is acceptable to provide a gas passage 49 between the gas reserve section 46 and the small holes 48, thus allowing the gas flow to be rectified in a layer flow. It is appropriate to execute the process of the small holes 44 of the first block 41, comprised of the bisected bodies 41a and 41b, for example, in a manner as follows to achieve sufficient accuracy and efficiency. As shown in Figure 6, placing the two bisected bodies 41a and 41b that have been processed with slot type spaces 43a and 43b, which will serve as the liquid reserve section, so that the planes of opening of the groove-like spaces 43a and 43b form an identical plane and concurrently cut small grooves 44a and 44b to form the small holes 44 in both bisected bodies 41a and 41b, the divided bodies 41a and 41a are obtained. 41b, as shown in Figure 8. It is suitable to perform the process of the small holes 48 of the second block 42 comprised of the bisected bodies 42a and 42b, for example, in a manner as follows to achieve sufficient accuracy and efficiency. As shown in Figure 7, placing the two bisected bodies 42a and 42b that have been processed with the groove-like spaces 46a and 46b, which will serve as the gas reserve section 46, so that the opening planes of the slot-like spaces 46a and 46b form an identical plane and concurrently cut small grooves, 48a and 48b, to form the small holes 48 in both the bisected bodies 42a and 42b, The divided bodies 42a and 42b are obtained, as shown in FIG. Figure 9. Assembling the divided bodies, thus produced, 41a 41b, 42a and 42b, in the manner shown in Figure 10, and fixing the divided bodies 41a, 41b, 42a and 42b in the assembled state with the metal fittings (not shown) with interposition of the packages (not shown) in both end portions, the nozzle 4, shown in Figures 1 to 5, is obtained.

Second Modality Figure 11 is a bottom view showing a liquid coating nozzle, according to a second embodiment of the present invention, while Figure 12 is an enlarged view of a section portion X-X thereof. In Figures 11 and 12, a liquid coating nozzle 40 is equivalent to the liquid coating nozzle 4 of the first embodiment, except for the difference in the next point. In this nozzle 40, the internal discharge section is comprised of a number of small holes 44, while the external discharge section is comprised of two parallel slits 148a and 148b, arranged on both sides of the line of the small holes 44. The longitudinal end surface of the first block 41 is positioned so as to form a surface approximately identical to the bottom surface of the second block 42. The small holes 44 are comprised of a number of small holes having the same configuration and size as those of the first mode, however, the length becomes longer and they do not communicate with the gas reserve section 46. The second block 42 is elongated and has a sectional configuration of approximately one L (not shown in Figures 11 and 12) and has a wide slot to form the slits 148a and 148b on its longitudinal end surface, which constitutes the slits 148a and 148b tightly fitted to the longitudinal end side surface of the first block 41. At the nozzle of this embodiment, a linear liquid flow flows downward from the internal discharge section and a curtain-shaped flow of gas flows towards down from the external download section. Third Mode Figure 13 is a perspective view showing a liquid coating apparatus, according to a third embodiment of the present invention. In Figure 13, a liquid coating apparatus 1 is provided with: the tube support section 3, which rotatably supports a glass panel section 2 of a laterally elongated cathode ray tube, having an aspect ratio of , for example, 16: 9; the nozzle 4 of the first embodiment, which is elongated in the X direction (in the direction of movement of the sheet) in which the suspension of the phosphoric substance is discharged onto the glass panel section 2; and a nozzle movement section 5, which moves this nozzle 4 in the Y direction, perpendicular to the X direction in the tube support section 3. The tube support section 3 is a box-shaped element, the lower surface of which is mounted with a rotation pulse section 10, which includes a motor. It will be noted that the tube support section 3, which conforms in size to the glass panel section 2 of the cathode ray tube, is prepared and removably mounted to the rotation pulse section 10. Around the upper surface of the tube support section 3, a drainage slot 11 is formed, which has a slope for emptying the superfluous liquid. In the lowest position of the emptying slot 11 an outlet 12 is supplied, through which the superfluous liquid is discharged to the outside to be reused. In a central portion of section 3 of the tube support, an approximately rectangular mounting opening 13 is formed for mounting the glass panel section 2. The mounting opening 13 has a configuration that conforms to the periphery of the glass panel section 2 and is internally provided with a seal element 14 to prevent the liquid from escaping. The nozzle 4 has on its lower surface the small holes 44 and 48, which serve as internal and external discharge sections, arranged in the X direction. The length of the line of the small holes 44 and 48 is sufficiently longer than the length in the X direction of section 2 of the glass panel of the maximum size of the object to be coated.

As shown in Figures 13 and 14, the section 5 that moves the nozzle has a pair of guide rails 50, which are disposed on both sides of the tube support section 3 and extend in the Y direction, an axis 51 of ball thread, which is rotatably disposed along the guide rail 50 on the deep side in Figure 13, and an impulse frame 52 and a driven frame 53, which are fixed with the interposition of the packages and fixed metal fittings (not shown) at both ends of the nozzle 4. The ball threaded shaft 51 is rotatably supported at its ends by bearings 57 and 58, and a drive motor 54 is connected to an end portion of a side of the bearing 57. The drive frame 52 is provided with a linear bearing 55, guided by the guide rail 50, and a ball nut 56, to be engaged with the ball screw shaft 51. The driven frame 53 is provided with a linear bearing 55 guided by the guide rail 50. As shown in Figures 13 and 14, the impulse frame 52 and the driven frame 53 are provided with two air intakes (not shown) for introducing air into the gas reserve section 46 inside the nozzle 4 and a couple of liquid inputs and liquid outlets (not shown) to enter and download liquid within and from the 43 liquid reserve section, while this liquid circulates. Air hoses 30a and 30b are connected to the air inlets by means of metal connection accessories. The air hoses 30a and 30b are connected to an air pressure source 88, as shown in Figure 14. At the inlet and outlet of the liquid, circulation hoses 31 and 32 are connected by connecting metal fittings. As shown in Figure 14, the circulation hose 31 is connected to the outlet side of a circulation pump 33 comprised of a gear pump. The circulation hose 32 is connected to the inlet side of the circulation pump 33 by means of a valve 36. On the inlet side of the circulation pump 33 also connected to a tank 34 for the storage of the phosphorus suspension by valve means 35. In this case, the circulation arrangement of the liquid is to prevent the phosphoric substance in the liquid, which remains in the tubes, hoses and nozzle 4, from precipitating in the liquid in the stage of stopping the liquid. liquid supply. In the step of stopping the supply of liquid, the valve 35 is closed and the valve 36 is opened to circulate the liquid through the circulation hoses 31 and 32, thus preventing the precipitation of the phosphoric substance. The air inlets of the impulse frame 52 and the driven frame 53 are connected to the gas reserve section 46 of the nozzle 4, which is an elongated space in the S direction. The gas reserve section 46 communicates with the small holes 48 which serve as the external discharge section through the gas passage 49 in the bottom portion of the second block 42 of the nozzle 4. The gas passage 49 is a very thin space having a width slightly larger than that from the line of small holes 44 and 48, and is able to rectify the air in a layer flow. Air, which has passed through this space, is formed substantially in layer flow air. The liquid inlet and the liquid outlet are communicated with the liquid reserve section 43, which is an elongated space in the X direction. The liquid reserve section 43 is the space that has a very large capacity with respect to the flow regime, and the liquid reserved there will not be discharged under normal pressure. The liquid reserve section 43 communicates with the small holes 44 in the bottom portion and communicates with the small holes 48 in the outlet of the gas passage 49. When the air and liquid are supplied to the nozzle 4, which has the previous construction, with a controlled flow and pressure regime, as shown in Figure 4, an air flow 21, which externally cylindrically surrounds a linear flow 22 of liquid, which flows downward from the small holes 44 is formed. This liquid flow 22 is unceasingly discharged as guided by the air flow 21, although the supply amount is small. The operation of the liquid coating apparatus 1 of the third embodiment, constructed as before, will be described below. When the glass panel section 2 of the cathode ray tube of the object to be coated is mounted to the tube support section 3 and this section 3 is mounted to the rotation pulse section 10, so that its direction longitudinally extending in the direction Y, the valve 35 is opened and the valve 36 is closed, by this operation, the liquid that has circulated through the circulation hoses 31 and 32 and the liquid reserve section 43 within the nozzle 4 is supplied from the tank 34 to the nozzle 4 by means of the circulation hose 31. In addition, an air under pressure is supplied from the source 88 of air pressure to the nozzle 4. The air under pressure is introduced from the air hose 30 by the air inlet to the gas reserve section 46, where the it expands in the X direction and is guided to the gas passage 49. The air guided to the gas passage 49 is formed in a layer flow air 21, as it passes through it and is discharged from the small holes 48, which serve as the external discharge section.

On the other hand, the liquid supplied from the tank 34 by means of the circulation hose 31, by the circulation pump 33, is reserved in the liquid reserve section 43 by means of the liquid inlet and then expanded in the direction X. Then, the liquid is withdrawn through the small holes 44, which serve as the internal section of air discharge of the layer flow, and the linear liquid 22 is discharged down through small holes 48 along from air. It will be noted that the flow regime at this stage differs, depending on the size of the cathode ray tube 2, and is approximately 200 to 500 cc / min. When the discharge of air and liquid is initiated, the nozzle 4 moves in the Y direction with the movement of the pulse frame 52 in the Y direction by the rotation of the ball screw shaft 51 by the drive motor 54. example, as shown in Figure 18, with section 2 of the glass panel, arranged horizontally, the nozzle 4 moves horizontally. By moving the nozzle 4 in the Y direction while discharging the liquid from the nozzle 4, the flow 22 of the liquid discharged from the nozzle 4 is coated on the section 2 of the glass panel of the cathode ray tube. When the liquid coating is complete, the tube support section 3 is rotated at a speed of 40 to 50 rpm by the rotation pulse section 10, thereby drying the liquid with a heater 99, as shown in Figure 19 , placed in section 2 of the glass panel, while suppressing the flow of the liquid in the central portion, resulting in the formation of a film of a phosphoric substance. Then, a phosphoric layer is formed in the desired position by the known photo-lithographic method and then this process is repeated three times, so that the phosphoric layers of the three colors of red, blue and green are formed, for example, in a matrix form in the desired position in section 2 of the glass panel. In this case, the linear liquid 22 of a uniform thickness is discharged onto the section 2 of the glass panel, so it flows along the gas 21 discharged substantially in the form of a layer flow. Therefore, merely by moving the nozzle 4 relative to the section 2 of the glass panel, the liquid can be coated in the section 2 of the glass panel, while maintaining a constant thickness of the film. Accordingly, by adjusting the discharge amount of the liquid, a thin and uniform coating film, which has few irregularities in the coating, can be formed in a short time, while suppressing the consumption of the liquid. Also, since the flow rate is rotationally small, the liquid does not form bubbles, even when it comes into contact with section 2 of the glass panel. Also, since the length of the line of the small holes 44 and 48 is greater than the width of the section 2 of the glass panel of the cathode ray tube, the liquid can be coated at the time of movement. Fourth Mode A liquid coating apparatus, according to a fourth embodiment of the present invention, is equivalent to the liquid coating apparatus of the third embodiment, except that the nozzle 40 (Figures 11 and 12) of the second embodiment is used instead of the nozzle 4 of the first mode. When the air and liquid are supplied to the nozzle 40 of the second embodiment, with a controlled flow and pressure regime, an air flow in the form of a flat plate of a layer flow is discharged from the slits. 148a and 148b, and a linear liquid flow is discharged from the small holes 44 along the air. This flow of liquid is unceasingly discharged as guided by the air, although the amount of supply is small. Fifth Mode A liquid coating apparatus, according to the fifth embodiment of the present invention, is based on the liquid coating apparatus of the third embodiment and in which the nozzle 4 is arranged so that the longitudinal direction of the nozzle 4 is inclined relative to the longitudinal direction or the lateral direction of the object to be coated in the horizontal plane, and in this state the nozzle 4 moves parallel in the longitudinal direction or the lateral direction of the object to be coated. By the appropriate change in the angle of inclination of the nozzle 4, the distance between the parallel lines of the linear liquid flow placed on the object to be coated can be adjusted. Sixth Mode A liquid coating apparatus, according to a sixth embodiment of the present invention, is based on the liquid coating apparatus of the fourth embodiment and in which the nozzle 40 is arranged so that the longitudinal direction of the nozzle 40 is inclined relative to the longitudinal direction or lateral direction of the object to be coated in the horizontal plane, and in this state, the nozzle 40 moves parallel in the longitudinal direction or the lateral direction of the object that is going to coat. By appropriately changing the angle of inclination of the nozzle 40, in width of the covering film placed by the flow of liquid in the form of a curtain on the object to be coated, it can be adjusted.

Seventh Modality In the first, third or fifth modes, the internal discharge section may not be the small holes 44 but a slit, which has the length and width of the line of the small holes 44, and the external discharge section may not be of the small holes 48, but a slit having the length and width of the line of the small holes 48. In this case, the flow of liquid in the form of curtain, discharged from the internal discharge section flows down through of the external discharge section and the curtain-shaped gas flow externally surrounding this liquid flow, flows downward from the external discharge section. Eighth Mode In the first, second, third, fourth, fifth, sixth and seventh modes, an element that adjusts the temperature, for heating or cooling the liquid in the liquid reserve section 43 of the first block 41, can be supplied in the liquid reservoir section 43 or on the external surface of the liquid reservoir section 43 of the first block 41. As the temperature adjusting element, for example, an instrument such as a heater for performing only the heating, a instrument such as a Peltier device, capable of performing heating and cooling, an instrument such as a cooler, to perform only in cooling, or an instrument that is provided with a pipe for the flow of the heating medium or the cooling medium within of a block and an element for circulating the heating or cooling medium through this pipe, can be used. By the heating or cooling of the liquid by the temperature adjusting element, according to the rise and fall of the ambient temperature, in which the nozzle is used, the viscosity of the liquid can be kept constant, thus allowing the quantity of discharge be kept constant. Ninth Modality In the first, second, third, fourth, fifth, sixth, seventh or eighth modalities, a removal element for removing an object (such as a solidified resin material, particles of a pigment or the like, coagulated material of the particles) or similar) that narrows or seals the internal discharge section, when this section is clogged, can be supplied into or on the external surface of the liquid reserving section of the first block 41. The removal element can be a supersonic generator or a supersonic transmission element (for example a rod-shaped element) for transmitting a supersonic wave from a supersonic generator, placed outside the nozzle to the first block. By operating the removal element while the liquid is discharged, the internal discharge section can be prevented from narrowing or sealing. In addition, by operating the removal element while the discharge of the liquid is stopped, the small holes or the slit that have become narrowed or clogged can be cleaned to be restored to the original state. Tenth Modality In the first, second, third, fourth, fifth, sixth, seventh, eighth or ninth mode, making each section 43 of liquid reserve and gas reserve sections 46 with a configuration such that the sectional area increases gradually from one end side to the other, in the longitudinal direction of the nozzle 4 (or 40), liquid and gas can be supplied from the side of the smaller sectional area to the liquid reserve section 43, and the sections 48 gas reserves, respectively. With this arrangement, the liquid and gas in the liquid reserve section 43 and the gas reserve sections 46 are allowed to have a small pressure difference in the longitudinal direction of the nozzle 4 (or 40), thus allowing the discharge quantities of the liquid and gas are standardized. Eleventh Modality In the first embodiment, the nozzle 4 is supplied without a second block 42 (Figure 15). A nozzle 4a, according to the eleventh embodiment, has a simplified structure and increasing the pressure of the liquid within the reservoir section 43 of the liquid plus that of the first mode, the liquid can be discharged without any gas flow, allowing a flow of linear liquid flows down on the object to be coated. As a more realistic example, Figure 16 shows a modification of the nozzle 4 of Figure 15, in which its curved surfaces are reduced and the nozzle is engaged from flat surfaces. A liquid reserve section 163, an inclined surface 163a and small holes 164 of a nozzle 124, in Figure 16, correspond to the liquid reservoir section 43, the inclined surface 43a and the small holes 44, respectively. Several modifications of the small holes are shown in Figure 17. Number 164a denotes a laterally elongated hexagonal hole, 164b a circular hole, 164c an elliptical hole, laterally elongated, and 164d an elongated hole longitudinally elongated. Twelfth Modality In the second, third, fourth, fifth, sixth, seventh, eighth, ninth and tenth modalities, the nozzle 4a of the eleventh embodiment is used instead of the nozzle 4 of the first modality.

Using the liquid coating nozzle and the liquid coating method and apparatus with this nozzle of the present invention, a process for coating at least one of: a pattern protective layer (e.g., polyvinyl alcohol (PVA), polyvinyl pyrrolidone ( PVP), to reconstitute an opening that forms a phosphoric layer, a black inorganic pigment, containing a resin solution (for example, a resin solution in which a black pigment, such as carbon black) is dispersed to form a black matrix, and a phosphorus suspension (for example, a phosphoric suspension containing liquid graphite, green, blue and red), to form the phosphor layer, on the back surface of the glass panel of the cathode ray tube, can be made to enable the manufacture of this cathode ray tube.The coated pattern protective layer is processed by the known exposure method, thus forming a such as temporary points, which will be the opening that forms the phosphoric layer in the desired position. The pattern obtained has the advantage that it is thinner and more uniform than those coated with the protective layer using a conventional nozzle and the conventional liquid coating method and apparatus, thus suppressing color irregularity and improving white balance. The liquid, containing the black dye, coated on the back surface of the glass panel section in which the pattern is formed, is processed by the known method of developing for the removal of the protective layer in the pattern, thus forming a black matrix (also named as a black strip) around the portions where the pattern has existed (the portions that become the opening that forms the phosphoric layer). With respect to the obtained black matrix, an area will be surrounded by the black matrix is uniform in size, compared to that covered with the liquid containing the black dye, using the conventional nozzle and the conventional liquid coating method and apparatus. The phosphorus-containing liquid is coated on the back surface of the section of the glass panel on which the black matrix has formed, thus obtaining a phosphoric layer in the areas surrounded by the black matrix (the opening that forms the phosphoric layer) by the known method lithographic photo. This formation of the phosphoric layer is repeated three times for everything, in the order of green, blue and red, the phosphoric layers of the three colors of green, blue and red are formed in the areas surrounded by the black matrix on the back surface of the section of the glass panel. Each of the obtained phosphoric layers is uniform in thickness, as compared to that covered with the liquid by the use of the conventional nozzle and the conventional method and apparatus for coating the liquid. Subsequently, a cathode ray tube can be obtained by the known assembly method of this cathode ray tube. This cathode ray tube obtained is completely bright and free of luminance irregularities or has a good white balance free of color irregularities, compared with that covered with the protective layer, the liquid containing the black dye or the liquid containing the phosphoric substance, using the conventional nozzle and the conventional liquid coating method and apparatus. Also, the coating process is reduced by half to one third (in time and in the length of the line) of that conventional. Figure 20 shows rotary and overturning mechanisms for turning and turning the section 3 of the tube support, which are applicable to the modalities before and after described. As an example of the rotary mechanism, the rotary pulse section 10, for rotating the section 3 of the tube support, which supports the glass panel 2, is comprised of a motor 10a and a rotating shaft 10b, which rotates through the motor 10a and rotatably drives the tube support section 3. As an example of the tumbling mechanism, to flip the tube support section 3, the tumbling mechanism is comprised of a tumbling shaft 91, which rotatably supports the rotary shaft 10b, an impulse motor 93, to rotate the axle turn 91 at the desired angles, to flip the support section type 3, k, and a gearbox 92, disposed between the drive motor 93 and the tilt shaft 91. According to these arrangements, as shown in Figure 21 , for example, the coating process for coating a liquid containing a phosphoric substance (viscosity of 15 centipoise) in the glass panel 2 through the nozzle, is carried out in a condition where the glass panel 2 is arranged horizontally without rotating and flipping the glass panel 2, as shown in Figure 18. In the process of spreading the phosphoric substance, the glass panel 2 is rotated at 30 rpm by the rotating pulse section 10, without flipping 2 glass panel c with respect to the horizontal direction, to spread the liquid over the glass panel 2. Next, in the process of unloading the superfluous liquid, as shown in Figure 19, with the glass panel 2 flipped at an angle? = 110 °, with respect to the horizontal direction by the tumbling mechanism, the glass panel 2 is rotated at 150 rpm by the rotating pulse section 10, so the superfluous liquid is shaken and detached out of the glass panel. Next, as shown in Figure 19, with panel 2 of glass flipped in? = 110 °, with respect to the horizontal direction by the tumbling mechanism, the glass panel 2 is rotated at 20 rpm by the rotation pulse section 10, and the glass panel 2 is dried by the heater 99.

The liquid coating nozzle of the embodiments of the present invention comprises a first block, which internally has the liquid reserve section, extending in its longitudinal direction and the internal discharge section, formed in the longitudinal direction in the bottom portion of the liquid reserving section, this internal discharge section is comprised of a number of small holes or a slit; and the second block, which has the internal space defining the gas reserve section, extending in the longitudinal direction away from the first block and the external discharge section, formed in the longitudinal direction in the bottom portion of the space internal, the external discharge section, comprised of a number of small holes or a slit. Therefore, the liquid reserve section and the gas reserve section can become large, the pressure difference between one end side and the other end side in the longitudinal direction of each of the liquid reserve section and the gas reserve section can be reduced, and the amount of discharge from the discharge sections, internal and external, can be uniform in the longitudinal direction. Therefore, the liquid in the nozzle is discharged from the internal discharge section and the gas in the gas reserve section is discharged from the external discharge section, thus forming a gas flow that externally surrounds a linear liquid flow or in the form of a curtain, which flows down from the internal discharge section. Accordingly, the flow of the liquid flows directly downwards without deviation in the direction of movement of the nozzle to reach the surface of the object to be coated, without irregularities. When the internal discharge section and the external discharge section are small holes, a gas flow is formed, which cylindrically surrounds the linear flow of liquid and, therefore, the flow of the liquid tends to flow directly downwards without deviations or in the direction of movement or in the lateral direction of the nozzle. According to the liquid coating nozzle of the embodiments of the invention, the first block and the second blocks are each comprised of bisected bodies divided by the vertical plane that expands in the longitudinal direction through the center across the width of the internal download section. Accordingly, the nozzle can be easily disassembled and cleaned when a problem occurs, such as clogging of the nozzle holes, so that a stable discharge can be easily restored. According to the liquid coating nozzle of the embodiments of the invention, the configuration of each of the small holes, which constitute the internal discharge section and the external discharge section, is of an elongated hexagon. Therefore, each of the flow of liquid and the flow of gas flow directly downward as a flow that flips, since they hardly deviate to the sides. According to the liquid coating nozzle of the embodiments of the invention, the reservoir section of the liquid has the inclined surfaces, at the bottom of which the internal discharge section is placed. Therefore, even when the particles containing phosphorus particles precipitate while the liquid is at rest in the reserve section of the liquid, this liquid falls laterally along the inclined surfaces that are to be discharged from the section of discharge, without remaining in the reserve section of liquid, so it is difficult to cause color irregularity. According to the liquid coating nozzle of the embodiments of the invention, the sectional area of the gas reserve section is made as large as possible, as long as the required resistance is maintained. Therefore, the resistance of the first block is ensured and the difference in gas pressure between one end side and the other end side, in the longitudinal direction in the gas reserve section, is reduced, so that stabilizes the gas flow. The liquid coating nozzle of the embodiments of the invention comprise the block; which internally has the liquid reserve section, extending in its longitudinal direction, and the discharge section formed in the longitudinal direction in the bottom portion of the liquid reserve section, the discharge section being comprised of from a number of small holes or a slit. Accordingly, the reservoir section of the liquid can be made large, the pressure difference between the first end flank and the other end flange, in the longitudinal direction of the liquid reservoir section, can be reduced and the discharge amount of the discharge section can be uniform in the longitudinal direction. Therefore, the liquid in the nozzle is discharged from the discharge section, so that the liquid tends to flow directly downward in the form of a linear or curtain-type liquid flow. Therefore, the discharged liquid can reach the surface of the object to be coated without irregularities. When the discharge section is comprised of small holes, a linear liquid flow is formed and tends to flow directly downwards.

The method of manufacturing the liquid coating nozzle of the embodiments of the invention is a method for manufacturing the nozzle of the embodiments of the invention in which the first block and the second block are each comprised of bisected bodies divided by the vertical plane that expands in the longitudinal direction through the center across the internal discharge section, and this internal discharge section and / or the external discharge section are comprised of a number of small holes, where the process of the small holes are made by placing the two bisected bodies, which have been processed preparatoryly with the slot-like space, which serves as the liquid reserve section and / or the gas reserve section, so the opening plane of the space defines an identical plane and concurrently cuts small grooves to constitute the small holes of both bisected bodies. Therefore, a nozzle having the internal discharge section and / or the external discharge section, each comprised of a number of small exact holes, can be efficiently manufactured. According to the liquid coating method and the liquid coating apparatus of the embodiments of the invention, the external discharge section of the nozzle of the embodiments of the invention is made to face the object to be coated and at least one of the object to be coated and the nozzle move relative to each other in the direction that intercepts the longitudinal direction when the liquid flow is discharged in a linear or curtain-like configuration, while discharging the gas flow to the object which is going to be coated through the external discharge section. Therefore, by adjusting the discharge amount of the liquid, a thin and uniform coating film having a reduced coating irregularity can be formed in a short time while the liquid consumption is suppressed. According to the liquid coating method and the liquid coating apparatus of the embodiments of the invention, the discharge section of the nozzle of the embodiments of the invention is made to face the object to be coated and at least one of the object to be coated and the nozzle move relative to each other in the direction that intercepts the longitudinal direction when the liquid flow is discharged in a linear or curtain-like configuration towards the object to be coated, through the download section. Therefore, by adjusting the amount of discharge of the liquid by the pressure of the liquid in the reserve section of the liquid, a thin and uniform coating film can be formed, which has reduced coating irregularities, in a short time, while it suppresses the consumption of the liquid. According to the liquid coating apparatus of the embodiments of the invention, it is supplied with the liquid circulation passage, in order to supply, in a circulating manner, the liquid to the liquid reserve section, as well as the liquid circulation element. opening and closing, to open and close this passage of liquid circulation. With this arrangement, the circulation of the liquid can be made or stopped. Therefore, the circulation of the liquid can be stopped while the liquid is discharged, thus allowing the pressure to be established and the circulation of the liquid can be made while the discharge of the liquid is stopped, thus preventing the precipitation of the particles. According to the cathode ray tube of the embodiments of the invention, the phosphoric substance is coated on the back surface of the section of the glass panel by the liquid coating method of the embodiments. Therefore, the thickness of the phosphor layer is uniform, so the color irregularity is eliminated and a good white balance is achieved. According to the cathode ray tube of the embodiments of the invention, the phosphoric substance is coated on the back surface of the glass panel section by the liquid coating apparatus of the embodiments. Therefore, the thickness of the phosphor layer is uniform, so that color irregularity is eliminated and a good white balance is achieved. The method of manufacturing the cathode ray tube of the invention includes a coating process, as well as the coating materials for the phosphoric screen process, at least one of a precoating liquid for performing this precoating to improve the adhesive property and the soaking capacity of a coating liquid, a patterned protective layer, to form the openings of the phosphoric substance, a liquid graphite, to form a black matrix, a phosphoric suspension and a lacquering liquid for the film. on the inner surface of the glass panel of the cathode ray tube, using the mouthpiece of the modalities. For this purpose, for example, a cathode ray tube, in which there is no difference between the central portion and the peripheral portion of the object to be used in the size of the phosphor layer that forms an opening there, to achieve the uniformity (when the protective layer with a certain pattern is used) and / or no color irregularity in generating the black matrix, thus improving the screen resolution (when a liquid containing a black dye is coated, to form the black matrix) and / or the thickness of the phosphor layer is uniform, thus achieving a good white balance and high luminance free of color irregularity (when the phosphoric suspension to constitute the phosphoric layer is coated) can be manufactured. In the embodiments, as an example where the thickness of the phosphor layer is more uniform than conventional, in the conventional coating method, the central portion of a glass panel is 100, while the four corner portions (peripheral portions) they are 70 to 80 in regime, which is less than that of the central portion. On the other hand, in the embodiment, the central portion of a glass panel is 100 while its four corner portions may be 95 to 100 in regime, which is substantially equal to that of the central portion. In some cases, taking into account the tendency that the peripheral portion is darker than the center portion of a cathode ray tube, the thickness of the four corner portions can be from 105 to 110 in regime, which is thicker than that of the central portion. Other embodiments of the present invention will be described schematically. A liquid coating nozzle, according to one embodiment of the present invention, is characterized by a plurality of discharge holes, which are arranged linearly, and when a discharge hole has a length D in the direction of sweep of the nozzle and a length d in a direction perpendicular to the direction of sweep of the nozzle and a section of liquid guide within the nozzle with a length L, the ratio of 1 <is maintained; L / D < 10, and if necessary, D > d. According to the nozzle described above, the direction in which the coating liquid is discharged may be mandatory, regulated in the direction of sweep of the nozzle. With this arrangement, the phenomenon of lateral splashing can be removed, which is a phenomenon that the liquid is discharged in a direction perpendicular to the direction of sweep of the nozzle. A method of manufacturing the cathode ray tube, according to one embodiment of the present invention, is characterized in that a liquid coating nozzle is used, in which a plurality of discharge holes are linearly arranged, when the discharge hole it has a length D in the direction of sweep of the nozzle and a length d in a direction perpendicular to the direction of sweep of the nozzle and a section of liquid guide within the nozzle has a length L, a ratio of 1 < L / D < 10 is maintained and, if necessary, D > d, the method comprises the processes of: sweeping the coating nozzle in a direction of a shorter side or in a direction of a longer side of a glass panel, for example, the glass panel of a cathode ray tube it's constant; and so the linear coating of the coating materials for the phosphoric screen process proceeds in a section forming the phosphoric substance (screen area) of the glass panel. According to the manufacturing method, the front surface of the panel is preferably arranged substantially horizontally. The substantial parallelism relative to the horizontal axis means that when the front surface of the panel is a flat surface, the portion of the flat surface is parallel to the horizontal axis. When the front panel surface has a curvature, it means that a tangential line at the apex of the curvature portion is parallel to the horizontal axis. According to the manufacturing method, in the case where, for example, a suspension (aqueous paste) of the phosphoric substance is coated in the above coating process, in addition to the process, the method comprises a process of spreading an aqueous paste over the entire surface of the phosphoric substance, which forms the section of the panel while causing the glass panel to have a rotation speed of 30 to 60 rpm; and a process of unloading a superfluous aqueous paste, while adjusting the rotation speed of the glass panel at 50 to 150 rpm and adjusting the turning angle? of the panel at 95 to 115 degrees, relative to the horizontal axis; and a process to dry a phosphoric film while adjusting the rotation speed of the glass panel at 10 to 150 rpm, the process is sequenced in the order of the coating process, the extension process, the discharge process and the process of drying, preferably. According to the manufacturing method, a phosphoric surface from which the coating pattern has a uniform quality, can be carried out at a higher level, and a high luminance cathode ray tube can be supplied. According to the manufacturing method, it is preferable that the section forming the phosphor surface of the panel has a completely flat configuration. By the method, a good phosphoric surface can be formed in the completely flat configuration panel, which can prevent an irregular reflection due to external light. These embodiments are specifically described in the drawings as follows. The thirteenth embodiment of the present invention will be described below with reference to the drawings. Figures 22A, 22B and 22C show a three-sided view of the coating nozzle of the thirteenth embodiment of the present invention. In Figures 22A, 22B and 22C, 101 denotes a coating nozzle, 101a is a body of the coating nozzle and 101b is a discharge section. The reference number 102 denotes discharge holes disposed linearly in the discharge section 101b. An aqueous paste is linearly coated on an internal space of the glass panel through the discharge holes 102. In addition, L denotes the length of the discharge guide section, D denotes the length of the discharge hole in the direction of the nozzle sweep, and d denotes the length of the discharge hole in the widthwise direction. The lengths L, D and d satisfy the relations of the following two expressions. D >; d 1 < L / D < 10. By specifying the lengths L, D and d, as indicated by the above expressions of relations, the direction in which the coating liquid is discharged may be regulated in the direction of sweep of the nozzle. With this arrangement, the phenomenon of lateral splashing can be removed. This phenomenon of lateral splashing is due to the liquid being discharged in a direction perpendicular to the direction of sweep of the nozzle. When the repressions of relationships mentioned above are not satisfied or, for example, when D < d, in some cases, it is possible that the discharge of the liquid in the direction of sweep is regulated, so that the folding of the liquid in the widthwise direction is promoted disadvantageously. When 1 > L / D, the discharge status of the liquid depends significantly on the configuration of the discharge hole. When L / D > 10, the accuracy of the nozzle process, such as the surface finish of the guide section of the discharge liquid finally influences the discharge of the liquid. For the above reasons, the discharge of the liquid is suppressed, depending on the accuracy of the process. When the force to compress the liquid out of the nozzle is too great, it is necessary to supply a pump with a higher capacity. Therefore, in practical use, it is preferable that 3 < L / D < 8. With respect to the size of the discharge hole and the distance between the adjacent holes, they are preferably as large as possible, taking into account the prevention of seals and the convenience of maintenance. It will be noted that they are required to be adjusted, depending on the size of the cathode ray tube to be manufactured. The construction of the thirteenth modality can be applied to the mouthpiece of Figure 16 and the mouthpiece of the modalities. Figure 23 is a schematic view showing an aqueous paste coating method of the fourteenth embodiment of the present invention. In Figure 23, 103 denotes a glass panel, 104 is a vertical axis, 105 is the aqueous paste and 106 is an inner surface of the glass panel. The coating nozzle 101 is the same as that shown in Figures 22a, 22B and 22C. In order to form a phosphoric surface on the internal surface 106 of the panel, the adjustment of the aqueous paste to be coated is carried out first. This adjustment of the aqueous paste is carried out by mixing, for example, a green phosphoric substance, a polyvinyl alcohol resin, ammonium bichromate, a surface active agent and an anti-foaming agent and water. The above materials are mixed together using a propeller-type mixer and then dispersed for the specified time using a disperser. A specified ammonium bichromate and ammonia are then incorporated into the adjusted aqueous paste, so that the pH and density of the aqueous paste are adjusted to provide an aqueous coating paste. In order to increase the adhesive strength of the phosphoric substance, the aqueous paste can be subjected to a grinding process in a ball mill. The processes for the formation of the phosphoric surface will be described independently of the coating process, the extension process, the discharge process and the drying process. (a) Coating process First, the aqueous paste 105 adjusted as described above, is coated on the inner surface 106 of the panel, using the coating nozzle 101, as shown in Figure 23. On the inner surface 106 of the panel a black matrix has been formed preparatoryly. This coating is performed by sweeping the coating nozzle 101 in the direction indicated by the arrow 107 at a specified discharge rate and a specified sweep speed. The glass panel 103, in the coating step, is arranged horizontally. That is, according to the nozzle 4 and the glass panel 2 in Figure 18, the front surface of the glass panel 103 is disposed substantially parallel to the horizontal axis. The substantial parallelism with respect to the horizontal axis means that when the front surface of the panel is a flat surface, the portion of the flat surface is parallel to the horizontal axis. When the front surface of the panel has a curvature, it means that a line tangential to the apex of the portion of curvature is parallel to the horizontal axis. (b) Extension Process j When the coating of the aqueous paste 105 is completed, the rotation speed of the glass panel 103 (abbreviated later as the rotation speed of the glass panel) around the vertical axis 102 is set to 30 60 rpm. With this arrangement, the aqueous paste 105 necessarily extends over the effective surface of the inner surface 106 of the panel, thus allowing the liquid to be prevented from flowing back to the central portion of the inner surface 106 of the panel and allowing non-uniformity of the coating pattern between the central portion and the peripheral portion of the internal surface 106 of the panel is reduced. This extension process can be carried out with the glass panel kept substantially parallel to the horizontal axis, as in the previous coating process. In order to promote sufficient precipitation of the phosphoric particles and reduce the difference between the central portion and the peripheral portion of the glass panel in the particle filling property as low as possible, the extension process can be performed while the Glass panel is properly rotated by any turning angle of the glass panel, which is not greater than 45 degrees. The arrangement that the rotary speed of the panel is adjusted at 30 to 60 rpm, is for the following reasons. When the speed of rotation of the panel is less than 30 rpm, the aqueous paste 105 empties undesirably in the central portion of the inner surface 106 of the panel, causing an uneven coating. When the speed of rotation of the panel is greater than 60 rpm, the emptied aqueous paste 105 tries to extend over the entire internal surface of the panel 106 with a greater force, as a consequence of the increase in centrifugal force, due to the increase in speed of rotation. For this reason, the aqueous paste 105 strongly impacts the wall surface 103a of the internal panel surface 106 in the peripheral portion of the internal panel surface 106. Minute bubbles are generated due to this collision, and these bubbles are disadvantageously left on the inner surface. (c) Discharge Process Next, as in the glass panel 2 of Figure 19, the rotational speed of the panel is increased at a rotation speed greater than that of the aforementioned coating process and the glass panel 103 is turned over in relation to the horizontal axis. With this arrangement, the aqueous slurry 105, which is left superfluously in the peripheral portion of the inner surface 106 of the panel, is shaken and detached to be discharged from the glass panel 103. In this discharge stage, the rotational speed of the panel it is preferably 50 to 150 rpm. This is for the following reasons. When the rotary speed is less than 50 rpm, disadvantageously the liquid flows back onto the internal surface 106 of the panel from its wall surface or the boundary portion between the effective surface and the wall surface of the internal surface 106 of the panel is smeared through the process of increasing the angle of the panel. turning glass panel 103 from zero degrees. Conversely, when the rotary speed of the panel is greater than 150 rpm, a disadvantageously radially irregular coating occurs. from the central portion to the peripheral portion of the internal surface 106 of the panel. The turning angle of the glass panel 103 becomes identical also in the drying process, described as follows. In particular, the angle is preferably 95 to 115 degrees relative to the horizontal axis. This is for the following reasons. When the turning angle of the glass panel 103 is less than 95 degrees, disadvantageously a non-uniform drying occurs at the peripheral portion of the inner surface of the panel 106 or the aqueous paste 105 flows back onto the internal surface 106 of the panel from its wall surface. Conversely, when the turning angle of the glass panel 103 is greater than 115 degrees, non-uniform drying becomes more significant. Drying Process At once, the rotational speed of the panel is reduced, while maintaining the turning angle of the glass panel 103 in the aforementioned discharge process. In this state, by externally heating the glass panel 103 by an infrared panel heater (such as 99 in Figure 19), the phosphoric surface is dried. In this step, a jet of hot air can be blown onto the internal surface 106 of the panel, as needed, in addition to heating by the heater. By this operation, the time required for drying can be reduced. The rotational speed of the panel is preferably as low as possible, as long as the production time allows. Although the case has been described where the rotary speed of the panel is reduced below the speed of rotation in the aforementioned discharge process, the present invention is not limited thereto. In particular, the rotation speed of the panel in the drying step is preferably 10 to 150 rpm. Within this range, the drying state has no problem. It will be noted that the rotational speed is preferably made smaller in the second and third coating steps for the purpose of better performing the coating pattern of the aqueous slurry 105. When the emptying amount of the slurry 105 is too large, the inclusion of bubbles or the like tends to occur due to splashing of liquid in the periphery portion of the inner surface 106 of the panel. Conversely, when it is small, the effective surface of the internal surface 106 of the panel can not be sufficiently coated. Therefore, for example, in the case of a glass panel 103 of 41 cm. , the amount is preferably from 7 to 30 cm3. It will be noted that the present invention does not require to be limited thereto in relation to the amount of discharge, the nozzle sweep speed, the angle of the panel turning and the speed of rotation of the panel. Through the aforementioned processes, a green phosphoric coating film is formed on the glass panel 103. Next, the glass panel 103 is mounted with a shadow mask (not shown) and then subjected to exposure to ultraviolet light and to a development process, so that a green phosphoric surface is produced. Through the same process, a blue phosphoric surface and a red phosphoric surface can be produced. Submitting the sample obtained from the phosphoric surface to an aluminum film process, then incorporating a shadow mask, a funnel, a magnetic shield, etc. (not shown) in it, enclosing an electron gun (not shown) and discharging the gas, a complete tube is produced. You will not notice that the portion that forms the phosphoric substance of the internal surface 106 of the panel, preferably has a completely flat surface in the aforementioned embodiment. When there is a completely flat surface, irregular reflection due to external light can be prevented.

Examples of the present invention and comparative examples will be described below with reference to the drawings. In each case, submitting the sample obtained from the phosphoric surface to the film and aluminum process, then incorporating a shadow mask, a funnel, a magnetic shield, etc., into it, enclosing an electron gun and discharging the gas , a complete tube is produced. The phosphoric surface is to be used in a cathode ray tube that is 41 cm in size. Example 1 The coating nozzle used in this example 1 is the same as that of the aforementioned embodiment, described with reference to Figures 22A, 22B and 22C. First, as the aqueous paste 105 to be coated on the inner surface 106 of the panel, the following materials were used to adjust this aqueous paste 105. Green phosphorus (produced by Nichia Kagaku Kogyou): 25% by weight Polyvinyl alcohol resin 2.5% by weight Ammonium bichromate 0.25% by weight Surface active agent 0.03% by weight Anti-foaming agent 0.02% by weight Water 72.2% by weight The above materials were mixed together using a propellant type mixer and then dispersed for a time specified, with the use of a disperser. As green phosphorus, one was used which has a particle diameter of 4 μm and was obtained by contaminating a zinc sulphide with copper, which serves as an activator. As the glass panel 103, one with a size of 41 cm was used. , a panel transmittance of 52% and a completely flat effective internal surface. The adjusted aqueous paste 105 was further incorporated with a specified ammonium bichromate and ammonia, so that the pH of the aqueous paste was adjusted to 8 to 9, for the provision of an aqueous coating paste. Next, the adjusted aqueous paste 105 was coated on the internal surface 106 of the panel, which has already been supplied with a black matrix by the use of the coating nozzle 101, shown in Figures 2A, 22B and 22C, in accordance with the method shown in Figure 23 by a discharge amount of 25 cm3 from the nozzle at a nozzle sweep speed of 15 cm./sec. Simultaneously with the aforementioned coating, the rotational speed of the panel was increased to 40 rpm so that the aqueous paste 105 would spread as far as possible on the effective surface of the internal surface 106 of the panel. Next, the phosphoric particles were obtained and precipitated sufficiently with the glass panel 103 held horizontally. In the aforementioned coating step, the phosphoric liquid from the coating nozzle 101 was uniformly coated over the entire internal surface 106 of the panel, without side splashing. Next, the rotary speed of the panel was increased to 90 rpm in order to shake and release the aqueous paste 105 left in the peripheral portion of the panel of the inner surface 106 of the panel, while turning the glass panel 103 at an angle of 110 degrees. in relation to the horizontal axis and unloading of the glass panel 103. In addition, the rotational speed of the panel was reduced to 30 rpm while maintaining the turning angle of the glass panel 103 at 110 degrees, so that the phosphor surface is dried externally by an infrared panel heater. Next, a shadow mask is mounted on the glass panel 103, coated with the green phosphoric substance and then subjected to exposure to ultraviolet light and a developing process, so that a surface of green phosphoric substance is produced. The strip size of the green phosphoric substance obtained was 65 μm in the central portion and 67 μm in the peripheral portion of the internal surface 106 of the panel. No adhesion of the green phosphoric substance to the internal surface 106 of the panel was observed. Similarly, an aqueous paste 105 in which a blue phosphoric substance having a particle diameter of 4 μm has been suspended and coated on the internal surface 106 of the panel, so that the blue phosphoric surface was obtained. In addition, for the third color, an aqueous paste 105, in which a red phosphoric substance having a particle diameter of 5 μm has been suspended and coated on the inner surface of the panel, so that the red phosphoric surface was obtained . The strip size of the blue phosphoric substance was 68 μm in the central portion and 69 μm in the peripheral portion of the internal surface 106 of the panel, while the size of the strip of the red phosphoric substance was 70 μm in the central portion and 72 μm in the peripheral portion of the inner surface 106 of the panel. The blue and red phosphoric substances that have adhered to the surface of the green phosphoric substance were of the order of two to three particles per length of 200 μm. Almost no red phosphoric substance adhered to the surface of the blue phosphoric substance was observed.

Example 2 According to Example 2, all conditions were the same as in Example 1, except for the arrangement that the rotation speed of the panel, immediately after the emptying of the aqueous paste 105 through the coating nozzle 101 was adjusted at 50 rpm. The size of the strips of the green phosphoric substance obtained was 66 μm in the central portion and 69 μm in the peripheral portion of the internal surface 106 of the panel. No adhesion of the green phosphoric substance to the inner surface 106 of the panel was observed. The size of the strip of the blue phosphoric substance was 66 μm in the central portion and 68 μm in the peripheral portion of the internal surface 106 of the panel, while the size of the strip of the red phosphoric substance was 71 μm in the central portion and 74 μm in the peripheral portion of the internal surface 106 of the panel. The blue and red phosphoric substances that adhered to the surface of the green phosphoric substance were in the order of one to two particles per 200 μm length. Almost none of the red phosphoric substance adhering to the surface of the blue phosphoric substance was observed in the central portion of the inner surface 106 of the panel, and several particles were observed in the peripheral portion of the inner surface 106 of the panel.

Example 3 According to Example 3, all conditions were the same as those of Example 1, except for the arrangement that the rotation speed of the panel in the discharge stage of the superfluous aqueous paste 105 was adjusted to 150 rpm. The size of the strip of the green phosphoric substance was 66 μm in the center portion and 69 μm in the peripheral portion of the inner surface 106 of the panel. There was almost no adhesion of the green phosphoric substance to the internal surface 106 of the panel . The size of the strip of the blue phosphoric substance was 70 μm in the central portion and 71 μm in the peripheral portion of the internal surface 106 of the panel, while the size of the strip of the red phosphoric substance was 70 μm in the central portion and 74 μm in the peripheral portion of the internal surface 106 of the panel. The blue and red phosphoric substances adhering to the surface of the green phosphoric substance were of the order of one to two particles per length of 200 μm. Almost no red phosphoric substance adhering to the surface of the blue phosphoric substance was observed in the central portion of the inner surface 106 of the panel and several particles were observed in the peripheral portion of the inner surface 106 of the panel.

Example 4 According to Example 4, all conditions were the same as those of Example 1, except for the arrangement that the rotation speed of the panel in the discharge stage of the superfluous aqueous paste 105 was adjusted to 90 rpm and the speed of rotation in the subsequent drying step was adjusted to 90 rpm. The size of the strip of the green phosphoric substance was 67 μm in the center portion and 69 μm in the peripheral portion of the internal surface 106 of the panel. Adherence of the green phosphoric substance to the inner surface 106 of the panel. The size of the strip of the blue phosphoric substance was 69 μm in the central portion and 71 μm in the peripheral portion of the internal surface 106 of the panel, while the size of the strip of the red phosphoric substance was 70 μm in the central portion and 73 μm in the peripheral portion of the internal surface 106 of the panel. The blue and red phosphoric substances adhering to the surface of the green phosphoric substance were of the order of one to two particles per length of 200 μm. Almost no red phosphoric substance adhering to the surface of the blue phosphoric substance was observed in the central portion of the inner surface 106 of the panel and several particles were observed in the peripheral portion of the inner surface 106 of the panel.

Comparative Example 1 According to Comparative Example 1, all the conditions were the same as those of Example 1, except for the arrangement that the rotary speed of the panel for precipitation of the phosphoric substance was adjusted at 15 rpm. The strip size of the blue phosphoric substance obtained was 69 μm in the central portion and 66 μm in the peripheral portion of the internal surface 106 of the panel. The adhesion of about 10 particles of the green phosphoric substance to the black matrix was observed within the 200 μm length range on the entire internal surface 106 of the panel. Also, non-uniformity of the coating occurred radially from the central portion to the peripheral portion of the inner surface 106 of the panel, as shown in Figure 24. It was observed on the inner surface 106 of the panel after the green aqueous paste had been removed. drying The size of the strip of the blue phosphoric substance was 70 μm in the central portion and 68 μm in the peripheral portion of the internal surface 106 of the panel, while the size of the strip of the red phosphoric substance was 76 μm in the central portion and 71 μm in the peripheral portion of the internal surface 106 of the panel. The blue and red phosphoric substances that were adhered to the surface of the green phosphoric substance were of the order of several particles per 100 μm length. However, an unlimited number of the red phosphoric substance that had adhered to the surface of the blue phosphoric substance was observed over the entire surface of the internal surface 106 of the panel.

Comparative Example 2 According to Comparative Example 2, all conditions were the same as those of Example 1, except for the arrangement of the conventional coating nozzle 11, processed with the holes, as shown in Figures 25A, 25B and 25C, was used. The coating nozzle, shown in Figures 25A, 25B and 25C, has round holes 108, where the ratio of D > d, as in the aforementioned moty, was not satisfied. In this case, the aqueous paste 105, discharged from the coating nozzle 111, exhibited the phenomenon of partial side spattering, and the uncoated portions 110 and 110a (the reference number 100 denotes a coated portion) were left on the inner surface 106 of the panel, as shown in Figure 26, so that the entire effective surface of the internal surfaces 100 of the panel is not able to fill with the aqueous paste 105 even through the process of rotating the subsequent panel.

Comparative Example 3 According to Comparative Example 3, all the conditions were the same as those of Example 1, except for the arrangement than the conventional coating nozzle processed with the holes, as shown in Figures 25A, 25B and 25C , were used as in Comparative Example 2 and the rotation speed of the panel in the discharge stage of the superfluous aqueous paste 105 was adjusted to 150 rpm. A non-uniformity of the radial coating, similar to that shown in Figure 24, was observed on the internal surface 106 of the panel. The results of the measurement and evaluation of Examples 1 to 4, and Comparative Examples 1 to 3, are shown in the following Table. First, the evaluation of the coating pattern and the contamination of the phosphoric substance is shown in the following Table 1. Table 1 In Table 1, the O mark indicates that the coating pattern is good, the brand? indicates that the coating pattern has a non-uniformity, and the x mark indicates that there is an uncoated portion. In addition, B, R / G show the contamination of the blue phosphoric substance and the red phosphoric substance with the green phosphoric surface, R / B shows the contamination of the red phosphoric substance with the blue phosphoric substance and the G surface indicates the contamination of the green phosphoric substance with the internal surface 106 of the panel. Each numerical value in the table indicates the amount of adhering particles of the other phosphoric substance by 200 μm. As is understood from Table 1, in contrast to the fact that each Comparative Example 1 to 3 has a defect in the coating pattern, each of Examples 1 to 4 is good. Next, the evaluation of the finished tubes is shown in the following Table 2.

Table 2 In Table 2, R indicates luminance of a single red color, B indicates luminance of a single blue color, G indicates luminance of a single green color, and indicates white luminance, whose values are all relative to 100% of those of the Comparative Example 1. As will be understood from Table 2, the luminance values of Examples 1 to 4, each exceeds those of Comparative Examples 1 to 3. Although glass panel 103 of 41 cm. it was used in each of the examples of the present invention, it is not limited to these examples. Thus, for example even in the case of another size, the present invention can be applied sufficiently by adjusting the amount of discharge of the slurry 105 from the coating nozzle, the speed of sweep of the nozzle, etc. Also, although the configuration of the holes processed in the projection section, provided at the end portion 102 of the nozzle 101, is hexagonal, for the coating of the aqueous paste 105, in each of the examples of the present invention, the The configuration is not limited to the hexagonal shape as long as the linear configuration of the liquid discharge of the aqueous slurry 105 from the coating nozzle 101 can be ensured. Equally, although the description of the modalities refers to the formation of the film by the use of the aqueous paste 105, the present invention is not limited to this, and a liquid to be coated as a coating material for the process of coated phosphoric screen on the inner surface of the glass tube of the cathode ray tube, for example, a precoat liquid to improve the adhesive property and the soaking capacity of a coating liquid, a protective layer of certain pattern for forming openings for the phosphoric substance, a liquid graphite to form a black matrix, a suspension of the phosphoric substance and a lacquer liquid to form the film, can be used. Additionally, the present invention can be applied suitably to a case where the phosphoric substance having particles of various diameters is used and to a case where a pattern of the phosphoric substance is not a dot or strip pattern. As described above, in accordance with the liquid coating nozzle and the method of making the cathode ray tube of the present invention, using the linear coating nozzle and optimizing the coating program of the phosphor screen process, a surface phosphoric whose coating pattern has a uniform quality can be carried out at a higher level, and a high luminance cathode ray tube can be supplied. Therefore, the present invention can sufficiently cope with thinning and increasing the size of image screens in the future, which means that it is a very useful invention. The entire description of Japanese Applications No. 8.33391, filed on February 21, 1996 and No. 8-271104, filed on October 14, 1996, including specifications, claims, drawings and summaries, is incorporated herein by reference. In its whole. Although the present invention has been fully described in connection with the preferred embodiments and with reference to the accompanying drawings, it will be noted that various changes and modifications will be apparent to those skilled in the art. These changes and modifications will be understood to be included within the scope of the present invention, as defined by the appended claims, unless departing from them.

Claims (20)

1. CLAIMS 1. A liquid coating nozzle, for coating a liquid on an object to be coated, this nozzle comprises: a first block, which has an internal liquid reserve section, which extends in its longitudinal direction, and an internal discharge section, formed in the longitudinal direction in a bottom portion of the liquid reserve section, this internal discharge section includes a plurality of small holes or a slit; and a second block, which has an internal space, defining a gas reserve section, which extends in the longitudinal direction away from the first block, and a discharge section, formed in the longitudinal direction in a bottom portion. of the internal space, this external discharge section is comprised of a plurality of small holes or a slit, and forms a gas flow, which externally surrounds a flow of linear or curtain-shaped liquid, which flows downward from the section internal download.
2. 2. A liquid coating nozzle, as defined in claim 1, wherein the first block and the second block are each comprised of bisected bodies, divided by a vertical plane that expands in the longitudinal direction through a center the width of the internal download section.
3. 3. A liquid coating nozzle, as defined in claim 1 or 2, wherein the configuration of each of the small holes, which constitute the internal discharge section and the external discharge section, is that of an elongated hexagon.
4. 4. A liquid coating nozzle, as defined in any of claims 1 to 3, wherein the liquid reserving section has an inclined surface on the bottom of which the internal discharge section is positioned.
5. 5. A liquid coating nozzle, as defined in any of claims 1 to 4, wherein the gas reserve section has a sectional configuration which becomes as large as possible, as long as the resistance is maintained required
6. 6. A method for the manufacture of a liquid coating nozzle, for coating a liquid on an object to be coated, this method comprises: a first block, which has an internal liquid reserve section, extending in its direction longitudinal, and an internal discharge section, formed in the longitudinal direction in a bottom portion of the liquid reserving section, this internal discharge section is comprised of a plurality of small holes or a slit; and a second block, which has an internal space defining a gas reserve section, extending in the longitudinal direction to the outside of the first block and an external discharge section, formed in the longitudinal direction in the bottom portion of the internal space, the external discharge section is comprised of a plurality of small holes or a slit, and forms a gas flow externally surrounding a linear or curtain-shaped flow of liquid, flowing downward from the inner section of discharge, in which the first block and the second block are each comprised of bisected bodies divided by a vertical plane, which expands in the longitudinal direction through a center across the width of the internal discharge section, and this internal discharge section and / or the external discharge section is comprised of a plurality of small holes, the method comprises: placing two bisected bodies, which have been processed preliminarily with a slot-like space, which serves as the liquid reserve section and / or the gas reserve section, so that an aperture plane in the slot-like space defines an identical plane; and then, to cut concurrently small grooves to constitute the small holes of both bisected bodies, for which the process of these small holes is made.
7. 7. A method of coating liquid, for coating liquid on an object to be coated by a liquid coating nozzle, this method comprises: using the nozzle, as defined in any of claims 1 to 5, to obtain the external section of discharge that faces the object to be coated and then discharge the flow of the liquid in a linear or curtain-like configuration, while discharging the gas flow to the object to be coated, through the external section of the discharge; and moving the object to be coated and the nozzle relative to each other, in a direction which intercepts the longitudinal direction, while discharging the liquid.
8. 8. The liquid coating method for coating a liquid on an object to be coated by a liquid coating nozzle, as defined in claim 7, further comprising: discharging the superfluous liquid from the object to be coated , while turning and rotating the object to be coated, after this object to be coated and the nozzle move relative to each other; and then, dry the coated liquid on the object to be coated.
9. 9. A liquid coating apparatus, for coating a liquid on an object to be coated, this apparatus comprises: the nozzle defined in any of claims 1 to 5; and a relative movement device, for moving at least one of the nozzle and the object to be used, which faces the nozzle in one direction, which intercepts the longitudinal direction.
10. 10. A liquid coating apparatus, as defined in claim 9, further comprising: a liquid circulation passage, to supply, in a circulating manner, the liquid to the liquid reserve section; and an opening and closing member, for opening and closing the liquid circulation passage.
11. 11. A liquid coating apparatus, as defined in claim 9 or 10, further comprising: a rotating mechanism and a tumbling mechanism, to discharge the superfluous liquid from the object being coated, while turning and rotating this object that it is covered, after this object and the mouthpiece move relative to each other; and a drying device, for drying the coated liquid on the object to be coated.
12. 12. A liquid coating nozzle, in which a plurality of discharge holes are linearly arranged, and when the discharge hole has a length D in the direction of sweep of the nozzle and a liquid guide section within the nozzle has a length L, the ratio of 1 < L / D < 10
13. 13. A liquid coating nozzle, as defined in claim 12, wherein the length D of the discharge hole in the direction of sweep of the nozzle is greater than its length d in the direction perpendicular to the direction of sweep of the nozzle .
14. 14. A liquid coating nozzle, as defined in claim 12 or 13, wherein, when the discharge hole has the length D in the direction of sweep of the nozzle and the guide section of the liquid inside the nozzle has a length L, the ratio of 3 < L / D < 8,
15. 15. A method for manufacturing a cathode ray tube, for coating materials by the phosphor screen process on a glass panel, by the use of a liquid coating nozzle, in which a plurality of linearly disposed discharge holes are arranged , when the discharge hole has a length D, in the direction of sweep of the nozzle, and a liquid guide section within the nozzle has a length L, a ratio of 1 < L / D < 10, the method comprises: sweeping the coating nozzle in the direction of the shortest side or in the direction of the longest side of the glass panel; and thus linearly coating the coating materials for the screen process of a phosphoric substance, on a screen area of the glass panel.
16. 16. A method for forming a surface of a phosphoric substance, as defined in the claim 15, in which a front surface of the glass panel is disposed substantially parallel to a horizontal axis in the coating of the liquid.
17. 17. A method for making a cathode ray tube, as defined in claim 15 or 16, which in addition to the coating comprises: expanding the coating materials for the screen process of the phosphoric substance over the entire surface of the screen area of the glass panel, while causing the glass panel to have a rotational speed thereof of 30 at 60 rpm, after coating; Next, discharge the superfluous coating material for the screen process of the phosphoric substance, while adjusting the rotation speed of the glass panel at 50 to 150 rpm and adjusting the angle? of turning the glass panel at 95 to 115 degrees, relative to the horizontal axis; and then drying the film of the phosphoric substance, while adjusting the rotary speed of the glass panel at 10 to 150 rpm.
18. 18. A method of manufacturing a cathode ray tube, as defined in any of claims 15 to 17, wherein the screen area of the glass panel has a completely planar configuration.
19. 19. A method of manufacturing a cathode ray tube, as defined in any of claims 15 to 18, wherein a nozzle is used in which the length D of the discharge hole in the direction of sweep of the nozzle is larger than its length d in the direction perpendicular to the direction of sweep of the nozzle.
20. 20. A method of manufacturing a cathode ray tube, as defined in any of claims 15 to 19, wherein a nozzle is used where when the discharge hole has a length D in the direction of sweep of the nozzle and the liquid guide section within the nozzle has the length L, the ratio of 3 < L / D < 8