JP2001068022A - Method and device for manufacture of cathode-ray tube and liquid applying method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method and device for manufacturing a cathode-ray tube and a liquid applying method, capable of forming a uniformly coated surface without contaminating the area surrounding each small hole with the coating liquid, when the simultaneous spout of the liquid is to be started from the small holes. SOLUTION: A coating liquid discharge part 7 is equipped with a plurality of small holes 71, wherefrom a coating liquid is spouted to a glass inner surface 2, and at starting of the spouting, an air bleeding passage 72 provided separately from the small holes 71 is opened prior to feeding the liquid to the discharge part 7, then the liquid is fed to the part 7, and the air inside the part 7 is exhausted to outside together with the liquid from the air bleeding passage 72, followed by shutting of the passage 72.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a cathode ray tube, an apparatus for manufacturing a cathode ray tube, and a liquid coating method. The present invention relates to a method for manufacturing a cathode ray tube, a cathode ray tube manufacturing apparatus, and a liquid coating method capable of realizing a high fluorescent screen at a high level.

[0002]

2. Description of the Related Art A general cathode ray tube for a TV comprises a funnel-shaped cathode ray tube main body and a front glass made of transparent glass and covering the front surface of the cathode ray tube main body. The structure of the front glass is a deep dish having a moderately curved central surface and a frame-shaped outer peripheral wall erected on the outer periphery of the central surface. The end portion of the outer peripheral wall is joined to the front end surface of the cathode ray tube main body, and the cathode ray tube is assembled.

[0003] A phosphor layer is formed on the inner surface of the front glass, and an image can be displayed when the phosphor layer emits light by an electron beam irradiated from an electron gun. In a cathode ray tube for a color TV, a plurality of color phosphor layers are formed in a pattern such as a dot or a stripe.

In order to form a phosphor layer on the front glass, a phosphor slurry is supplied to the inner surface of the front glass by using a discharge means such as a nozzle, and the front glass is tilted and turned to form a phosphor coating film. After the formation of the phosphor coating film, an operation of drying and curing the phosphor coating film or forming the phosphor coating film in a predetermined pattern is performed.

[0005] As a means for discharging the phosphor slurry, a plurality of small holes are arranged in an axial direction on a liquid discharge arm crossing over the front glass, and the phosphor slurry is simultaneously supplied from the plurality of small holes into a curtain shape. A predetermined amount of the phosphor slurry is efficiently supplied to the entire inner surface of the front glass by causing the liquid discharge arm for discharging the phosphor slurry to move in parallel above the front glass while discharging the phosphor slurry in such a state. Methods and devices are known. In particular,
Japanese Patent Application No. 9-37548 filed by the present applicant earlier
No., Japanese Patent Application No. 10-77057, Japanese Patent Application No. 10-2646
No. 41 discloses a technique.

[0006]

However, the above-described method and apparatus for forming a phosphor screen have the following problems.

When the discharge of the phosphor slurry from the plurality of small holes is started simultaneously, there is no escape space for the air inside the discharge means of the phosphor slurry, and the phosphor slurry is spouted vigorously from the plurality of small holes together with the phosphor slurry. At that time, the periphery of the small hole was unevenly stained with the phosphor slurry. Once the perimeter of the pores is unevenly stained with the phosphor slurry, the phosphor slurry is pulled in a largely contaminated direction, causing a phenomenon that the phosphor slurry jumps sideways, resulting in an uncoated portion of the phosphor slurry on the inner surface of the front glass. I do. As a result, streaky coating unevenness occurred in the uncoated portion of the phosphor slurry, and the phosphor screen quality of the cathode ray tube was remarkably deteriorated. Further, when the periphery of the small hole is contaminated with the phosphor slurry, the phosphor slurry attached to the small hole is dried with time. In this state, when the liquid discharge arm for discharging the phosphor slurry is moved in parallel above the front glass, the dried phosphor is separated and falls into the front glass. The portion where the dried substance of the phosphor liquid has fallen becomes thicker and cannot be formed uniformly when the phosphor coating film is formed into a predetermined pattern by photographic development using an exposure table. For this reason, the phosphor screen quality of the cathode ray tube has been significantly reduced.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to solve the above-mentioned problem, and to prevent the periphery of a small hole from being contaminated with a coating solution when the application liquid is simultaneously discharged from a plurality of small holes. Another object of the present invention is to provide a cathode ray tube manufacturing method, a cathode ray tube manufacturing apparatus, and a liquid coating method that realize uniform coating surface formation.

[0009]

In order to achieve the above object, the present invention is configured as follows.

According to the first aspect of the present invention, a phosphor slurry is applied to the inner surface of the front glass of a cathode ray tube on which a dot or stripe-shaped black matrix has been formed in advance, and exposure and development are performed, so that each color is interposed between the black matrices. In a method for manufacturing a cathode ray tube having a step of forming a phosphor,
When forming a phosphor coating film on the inner surface of the front glass by sweeping the coating liquid discharge unit having a plurality of small holes and discharging the phosphor slurry from the small holes by one-way operation or reciprocating operation in one direction, A step of opening an air vent passage provided in the coating liquid discharge unit separately from the small holes before sending the phosphor slurry to the coating liquid discharge unit when starting to discharge the phosphor slurry from the coating liquid discharge unit; ,
Sending the phosphor slurry to the application liquid discharge unit after opening the air vent passage, and removing air remaining inside the application liquid discharge unit together with the phosphor slurry from the air vent passage to the outside of the coating liquid discharge unit. Closing the air vent passage after the air is exhausted.

According to a second aspect of the present invention, when the coating solution discharge section is swept in one direction by one-way operation or reciprocating operation to form the phosphor coating film on the inner surface of the front glass, the coating solution is applied. Continuously discharging a part of the phosphor slurry supplied to the inside of the discharge unit to the outside of the coating liquid discharge unit through the air vent passage; and A repetition step of repeating a stop operation for temporarily stopping the discharge, and a discharge restart operation for resuming the discharge of the phosphor slurry from the small holes of the coating liquid discharge unit after the stop. When performing the discharge resuming operation after the stop operation, the bubbles generated in the phosphor slurry in the phosphor slurry supply pipe line together with a part of the phosphor slurry , To provide a method of manufacturing a cathode ray tube according to the first aspect which is to perform the discharge step of continuously discharging to the outside of the coating solution discharge section through the air vent passage.

According to the third aspect of the present invention, when the coating liquid discharge section is swept in one direction by one-way operation or reciprocating operation to apply the phosphor coating film to the inner surface of the front glass, the air is released from the air vent passage. Of the phosphor slurry to be discharged, the discharge amount per unit time of the blue phosphor slurry or the green phosphor slurry is the blue phosphor slurry or the green phosphor slurry discharged from the whole of the plurality of small holes of the application liquid discharge unit. The method according to the second aspect, wherein the discharge amount per unit time of the cathode ray tube is 3 to 10%.

According to the fourth aspect of the present invention, when the coating liquid discharge section is swept in one direction by one-way operation or reciprocating operation to apply the phosphor coating film on the inner surface of the front glass, the coating liquid is discharged from the air vent passage. The second or third discharge amount of the red phosphor slurry per unit time of the phosphor phosphor slurry to be discharged is 5 to 12% of the discharge amount per unit time of the red phosphor slurry discharged from the plurality of small holes. A method for manufacturing a cathode ray tube according to an aspect is provided.

According to a fifth aspect of the present invention, in the repetition step, when the coating liquid discharge section passes above the outer peripheral wall of the front glass, the phosphor slurry is discharged from the coating liquid discharge section. The method for manufacturing a cathode ray tube according to any one of the second to fourth aspects, in which the discharge is temporarily stopped, is provided.

According to the sixth aspect of the present invention, the coating liquid discharge section having a plurality of small holes and discharging the coating liquid from the small holes is swept in one direction by one-way operation or reciprocating operation. In the liquid coating method of forming a coating film with a coating liquid on an object to be coated, when starting to discharge the coating liquid from the coating liquid discharge unit, the coating liquid is separated from the small holes before sending the coating liquid to the coating liquid discharge unit. A step of opening an air vent passage provided in the coating liquid discharge section, a step of feeding the coating liquid to the coating liquid discharge section after opening the air vent path, and a step of opening the coating liquid discharge section together with the coating liquid from the air vent passage. Discharging the remaining air to the outside of the application liquid discharge section, and then closing the air vent passage.

According to a seventh aspect of the present invention, when the coating liquid discharge section is swept in one direction by one-way operation or reciprocating operation to form a coating film on the object to be coated, the coating liquid discharge section is provided inside the coating liquid discharge section. A step of continuously discharging a part of the supplied coating liquid to the outside of the coating liquid discharge unit through an air vent passage, and a stop operation of temporarily stopping the discharge of the coating liquid from the small hole of the coating liquid discharge unit. And a repetition step of repeating discharge resumption for resuming the application liquid discharge. When the discharge resumption operation is performed after the stop operation in the repetition step, the discharge liquid is generated in the coating liquid in the coating liquid supply pipe path. Bubbles, along with a part of the coating solution,
A liquid coating method according to a sixth aspect, wherein the discharging step of continuously discharging the coating liquid to the outside of the coating liquid discharge section through the air vent passage is performed.

According to an eighth aspect of the present invention, a phosphor slurry is applied to the inner surface of the front glass of a cathode ray tube on which a dot or stripe-like black matrix has been formed in advance, and exposure and development are performed, so that each color is interposed between the black matrices. In a cathode ray tube manufacturing apparatus having a step of forming a phosphor, a coating liquid discharge unit having a plurality of small holes and an air vent passage provided separately from the small holes, and discharging a phosphor slurry from the small holes. A moving unit that sweeps the coating solution discharge unit in one direction by one-way operation or reciprocating operation, and a sweep unit that sweeps the coating solution discharge unit in one direction by one-way operation or reciprocating operation to apply the phosphor onto the inner surface of the front glass. When forming the film, before starting the discharge of the phosphor slurry from the coating liquid discharge unit, before sending the phosphor slurry to the coating liquid discharge unit In addition to opening the air vent passage provided in the coating liquid discharge unit separately from the small holes, air remaining in the coating liquid discharge unit together with the phosphor slurry from the air vent passage to the outside of the coating liquid discharge unit Cathode ray tube manufacturing, comprising: an air vent passage opening / closing means for closing the air vent passage after discharging; and a phosphor slurry supply device for feeding the phosphor slurry to the coating liquid discharge section after opening the air vent passage. Provide equipment.

According to a ninth aspect of the present invention, when forming the phosphor coating film on the inner surface of the front glass by sweeping the coating liquid discharge section in one direction by one way operation or reciprocating operation, A discharge mechanism for continuously discharging a part of the phosphor slurry supplied to the inside of the section through the air vent passage to the outside of the coating liquid discharge section, and the phosphor from the small hole of the coating liquid discharge section The apparatus further includes a control unit that repeatedly performs a stop operation of temporarily stopping the discharge of the slurry and a discharge restart operation of restarting the discharge of the phosphor slurry from the small holes of the application liquid discharge unit after the stop. When performing the discharge resuming operation after the stopping operation in the control unit, the discharge mechanism causes bubbles generated in the phosphor slurry in the phosphor slurry supply pipe line to emit the bubbles in the phosphor slurry. Together with part of the slurry, to provide a cathode ray tube manufacturing apparatus according to an eighth aspect of continuously discharged to the outside of the coating solution discharge section through the air vent passage.

According to a tenth aspect of the present invention, when the control unit causes the coating liquid ejection unit to sweep in one direction by one-way operation or reciprocating operation to apply the phosphor coating film on the inner surface of the front glass, The discharge mechanism discharges a blue phosphor slurry or a green phosphor slurry per unit time of the phosphor slurry discharged from the air vent passage from the entire plurality of small holes of the coating liquid discharge unit. A cathode ray tube manufacturing apparatus according to a ninth aspect, wherein the discharge amount of the blue phosphor slurry or the green phosphor slurry per unit time is controlled to be 3 to 10%.

According to an eleventh aspect of the present invention, when the control section sweeps the coating liquid discharge section in one direction by one-way operation or reciprocating operation to apply the phosphor slurry film on the inner surface of the front glass, The discharge mechanism is configured such that the discharge amount per unit time of the red phosphor slurry discharged from the air vent passage is 5 to 12% of the discharge amount per unit time of the red phosphor slurry discharged from the plurality of small holes. A cathode ray tube manufacturing apparatus according to the ninth or tenth aspect is provided for controlling.

According to a twelfth aspect of the present invention, when the coating liquid discharge section passes above the outer peripheral wall of the front glass, the control section controls the phosphor slurry from the coating liquid discharge section. Ninth to control to temporarily stop the discharge
A cathode ray tube manufacturing apparatus according to any one of the eleventh aspects is provided.

[0022]

Embodiments of the present invention will be described below in detail with reference to the drawings.

(First Embodiment) FIG. 1 is a perspective view showing a cathode ray tube manufacturing apparatus used in a method for manufacturing a cathode ray tube according to a first embodiment of the present invention, and FIG. 2 is a method for manufacturing a cathode ray tube according to the first embodiment. FIG. 2 is a partially cutaway side view of the cathode ray tube manufacturing apparatus used for the present invention.

In FIG. 1, an apparatus 1 used for a method of manufacturing a cathode ray tube has a holding section 3 for holding a front glass 2 of a cathode ray tube of 51 cm size having an aspect ratio of 4: 3, a coating section 4, a shielding section, and the like. A material 5 and a coating liquid recovery tank 6 are provided.

As shown in FIG. 2, the front glass 2 has a central surface portion 21 whose gently curved planar shape is substantially rectangular.
And an outer peripheral wall 20 erected on the outer periphery of the central surface portion 21. The central surface 21 may be substantially flat with little curvature. The central surface portion 21 and the outer peripheral wall 20 of the front glass 2 may be integrally formed, or may be formed by integrally joining separately manufactured members.

The holding portion 3 is provided at a central surface portion 21 of the front glass 2.
2, that is, the concave inner surface in FIG. 2 is held upward. At the bottom of the holding part 3, there is provided a turning part 30 having a rotation drive device such as a motor, and the holding part 3 is turned by driving the turning part 30.

The coating section 4 is a horizontal-bar-shaped coating liquid discharge section 7 that is horizontally arranged across the space above the front glass 2 housed in the holding section 3, and supports the coating liquid discharge section 7 to perform coating. A moving unit 8 that translates in a direction perpendicular to the longitudinal axis of the liquid discharging unit 7; Although only one coating unit 4 is shown in the figure for simplicity, one coating unit 4 applies a phosphor slurry of only one of blue, green, and red. , Blue, green, and red are applied, and a phosphor slurry of each color is applied from the application unit 4 for each color.

The shielding member 5 and the coating liquid recovery tank 6 are shown in FIG.
As shown in the figure, the front glass 2 is disposed on both sides along the moving direction of the application liquid discharge section. In FIG. 1, only the shielding member 5 and the coating liquid recovery tank 6 on the left side are illustrated, and the shielding member 5 on the right side and the coating liquid recovery tank 6 are not illustrated.

Each coating solution recovery tank 6 is arranged outside the front glass 2 and on both sides of the front glass 2.

The shielding material 5 is inclined so as to become lower toward the outside of the front glass 2 from above the end of the front glass 2 toward the coating liquid recovery tank 6.
Is disposed above the coating liquid recovery tank 6. The shielding material 5 has a tip end on the outer peripheral wall 20 of the front glass 2.
The phosphor slurry 70 discharged from the application liquid discharge unit 7 is disposed at a position protruding more inward than the shielding material 5.
When the phosphor slurry 70 falls on the shielding material 5
And is collected in the coating liquid recovery tank 6.

A moving unit 8 for moving the coating liquid discharging unit 7 in parallel
The end members 82 and 83 that hold the both ends of the application liquid discharge unit 7 are slidably supported by a pair of guide rails 80 and 80 that are arranged in parallel at a predetermined interval with the holding unit 3 interposed therebetween. It is configured. A ball screw shaft 81 penetrates one end member 82 of the end members 82 and 83 and is screwed with an internal nut portion. Ball screw shaft 81
Is located near one of the guide rails 80.
It is arranged parallel to 0 and rotatable forward and backward. By rotating the rotation axis of the motor 84 attached to one end of the ball screw shaft 81 in the forward and reverse directions, the ball screw shaft 81 was rotated in the forward and reverse directions, and was screwed into the ball screw shaft 81 with the forward and reverse rotation of the ball screw shaft 81. The end member 82 is a ball screw shaft 81
Move back and forth along the axial direction of. The opposite end member 83 integrated with the end member 82 via the application liquid discharge section 7
Also slide with respect to the other guide rail 80. As a result, the application liquid discharge section 7 can move in parallel above the front glass 2 by driving the motor 84 while being guided by the guide rails 80, 80.

A coating liquid supply pipe 85 is attached to an end member 83 holding one end of the coating liquid discharge section 7.
Through the coating liquid supply pipe 85, the phosphor slurry tank 10
0 to flow control valve 1 such as pump 101 and ball valve
The phosphor slurry is supplied to the inside of the coating liquid discharge unit 7 through the liquid supply unit 02. The phosphor slurry tank 100, the pump 101, and the flow control valve 102 such as a ball valve constitute an example of a phosphor slurry supply device.

FIG. 3 is a view of the application liquid discharge section 7 as viewed from below.
A plurality of small holes 71,.
1 is provided. The phosphor slurry supplied from the coating liquid supply pipe 85 into the coating liquid discharge section 7 is discharged simultaneously from all the small holes 71,. Coating liquid discharge section 7
As shown in FIG. 1, an air vent passage 72 composed of a flexible hose or the like, and an air vent passage opening / closing means 73 provided in the middle of the air vent passage 72,
Are provided, and the discharging mechanism 150 is configured. As the air vent passage opening / closing means 73, for example, a ball valve that can open and close the air vent passage 72 and adjust the flow rate is used. The liquid pressure loss in the air vent passage 72 is determined by the small holes 71,.
This is sufficiently smaller than the liquid pressure loss 71. Specifically, as shown in FIG. 6, the inside diameter of the air vent passage 72 may be set to be sufficiently larger than the inside diameter of the small hole 71 of the application liquid discharge unit 7. For example, it is sufficient that the inside diameter of the air vent passage 72 is about 10 times larger than the inside diameter of the small hole 71 of the application liquid discharge section 7. In general, the pressure loss is proportional to the length of the pipeline and inversely proportional to the fourth power of the inner diameter. Therefore, if the inside diameter of the air vent passage 72 is about 10 times the inside diameter of the small hole 71, the pressure loss is 1/10 ⁴ (1/10000), and the pipe length of the air vent passage 72 is slightly longer. However, the pressure loss is sufficiently reduced. As described above, the liquid pressure loss of the air vent passage 72 is reduced by the small holes 71 and
, 71, the air existing inside the application liquid discharge section 7 can be easily discharged to the outside through the air vent passage 72. In this embodiment, the end of the air vent passage 72 is an open end. One practical example of actually bleeding air is
A bucket or the like is prepared, and the bubbles and the slurry discharged through the air vent passage 72 are received in the bucket. After the air vent is completed, the valve 73 is closed. Thereafter, unless the valve 73 is opened, the end of the air vent passage 72 is
The open end may be used as in this embodiment.

Based on the above-described cathode ray tube manufacturing apparatus used in the cathode ray tube manufacturing method according to the first embodiment, the cathode ray tube manufacturing will be described with reference to FIGS. 1 to 6 and FIG. The steps will be described.

First, in step S41 of FIG. 4, a dot or stripe-shaped black matrix is formed on the inner surface of the front glass 2 of 51 cm size, for example, by photolithography.

Subsequently, as an example, 25% by weight of a blue phosphor (particle size: 7 μm, manufactured by Nichia Chemical Industry), 2.5% by weight of polyvinyl alcohol (Poval B-24 manufactured by Denka), ammonium bichromate (nichrome acid manufactured by Kanto Chemical Co., Ltd.) Ammonium) A composition comprising 0.25 wt%, a surfactant 0.04 wt%, a dispersant 0.02 wt%, and deionized water is stirred and suspended by a stirrer such as a mixer or a disperser, and has a viscosity coefficient of 20 mPa · s. The blue phosphor slurry was prepared and held in a blue phosphor slurry tank, for example, the phosphor slurry tank 100 of FIG. Further, an aqueous ammonia solution was added dropwise to the blue phosphor slurry in the blue phosphor slurry tank 100 to adjust the pH of the blue phosphor slurry to 8.0.

Next, in step S42, blue phosphor dots are formed using the blue phosphor slurry.

Specifically, steps S52 to S5 in FIG.
5 and S56 to S58 in FIG. That is, steps S52 to S55 in FIG.
This is carried out at least once when the slurry is started to be discharged from. Once the slurry is ejected from the application liquid ejecting section 7, the slurry is normally ejected continuously, and steps S52 to S5
5 does not repeat. Only steps S56 to S58 in FIG. 12 are repeatedly performed when manufacturing the cathode ray tube. Note that also in a second embodiment described later, step S52
Steps S55 to S55 are performed at least once.

First, in step S52, before supplying the phosphor slurry through the coating liquid supply pipe 85 into the coating liquid discharge section 7 in FIG. 1, the air releasing passage 72 is opened using the air releasing passage opening / closing means 73. State.

After that, in step S53, the pump 101 is driven to send the blue phosphor slurry from the inside of the blue phosphor slurry tank 100 to the coating liquid discharge section 7 through the flow control valve 102 and the coating liquid supply pipe 85. ,
.., 71 of the coating liquid discharge section 7 are started to discharge the blue phosphor slurry. At this time, the blue phosphor slurry gradually fills the inside of the coating liquid discharge section 7, and the air present inside the coating liquid discharge section 7 passes through the air vent passage 72 provided above the coating liquid discharge section 7. Is discharged. The pressure loss of the small holes 71 provided on the lower surface of the coating liquid discharge section 7 is sufficiently larger than the pressure loss of the air release passage 72, so that the coating liquid discharge section The air inside 7 is easily exhausted.

Next, in step S 54, when the discharge of the air inside the application liquid discharge section 7 is completed, the discharge of the blue phosphor slurry through the air vent passage 72 is started.
At this time, by closing the air vent passage 72 using the air vent passage opening / closing means 73, in step S55,
, 71 are all discharged from the small holes 71,..., 71, and the procedure for starting to discharge the blue phosphor slurry from the coating liquid discharge unit 7 is completed. Note that this operation is performed only once when the phosphor slurry is first sent to the application liquid discharge unit 7. During the above operation, the blue phosphor slurries 70,..., 70 sent to the application liquid discharge section 7 are vigorously jetted from the small holes 71,. , 71 are not contaminated with the blue phosphor slurry. Therefore, the small holes 71,.
The blue phosphor slurry 70, ..., 70 discharged from
Discharges straight without skipping sideways. In addition, each small hole 7
Since the area around 1 is not stained with the blue phosphor slurry,
The dried blue phosphor does not peel off and fall into the front glass 2.

The steps S52 to S55 need only be performed at least once when the discharge of the slurry from the coating liquid discharge section 7 is started.

On the other hand, once the slurry is discharged from the application liquid discharging section 7, the slurry is normally discharged continuously, so that steps S52 to S55 do not need to be repeated. , The following step S56
To S58 only.

First, in step S56, all the blue phosphor slurry supplied to the coating liquid discharge section 7 is discharged from the small holes 71,. , The blue phosphor slurry 7 from the plurality of small holes 71,.
The application liquid discharging unit 7 in which the total discharge amount of 0,...
By sweeping at a speed of mm / sec, the blue phosphor slurry is applied to the inner surface of the front glass 2 on which the black matrix has been formed in advance.

Then, in step S57, the holding section 3 is tilted and swiveled to sufficiently settle and deposit blue phosphor particles, and excess moisture is dried using a far-infrared heater.

Further, in step S58, the dried coating film 74 is exposed to ultraviolet light through a shadow mask.
A blue phosphor dot is formed at a predetermined position on the inner surface of the front glass 2 between the black matrices by developing with water or the like.

Similarly, in step S43 of FIG. 4, instead of the blue phosphor, a green phosphor (particle diameter of green phosphor manufactured by Nichia Corporation 7 μm, viscosity coefficient of green phosphor slurry 20 mPa · s) Using step S5
By performing the same operations as in steps S6 to S58, green phosphor dots are formed at predetermined positions on the front glass 2 between the black matrices.

Thereafter, similarly, in step S44, instead of the green phosphor, a red phosphor (particle diameter of red phosphor manufactured by Nichia Corporation 6 μm, viscosity coefficient of red phosphor slurry 25 mPa · s) is used. Use step S5
By performing the same operations as in steps S6 to S58, red phosphor dots are formed at predetermined positions between the black matrix on the front glass 2.

The phosphor used at this time may be one coated with a pigment of the same color so as to absorb light of another color and reflect only its own color, and the particle diameter of the phosphor is not limited to this. Not something.

Thus, steps S42 to S44
In step S45, blue phosphor dots, green phosphor dots, and red phosphor dots are respectively formed at predetermined positions between the black matrices on the front glass 2, and in step S45, the metal is formed by aluminum evaporation via a lacquer film. A back layer is formed.

Subsequently, in step S46, the front glass 2 on which the phosphor has been formed and the funnel are joined by a glass frit, an electron gun is enclosed, and a cathode ray tube is manufactured by vacuum evacuation.

At this time, the phosphor coating film 74 formed on the inner surface of the front glass 2 can be formed as a uniform film without coating unevenness due to unpainted portions and non-uniform film thickness due to phosphor foreign matter dropping (as an example). The defect rate of coating streaks is 1.
From 24% to 0.28%, the film thickness unevenness defect rate due to the fall of the phosphor foreign matter was reduced from 0.85% to 0.34%. ). Also, as an example, as a result of measuring the luminance of the manufactured cathode ray tube, high luminance (average peripheral luminance distribution 95%, worst 92
%) And stable color difference (4/1000 in the x direction, 6/1 in the y direction)
000).

According to the above-described embodiment, when the discharge of the phosphor slurry 70 from the coating liquid discharge section 7 is started, the air vent passage 72 provided separately from the plurality of small holes 71,. Is first opened, and then the phosphor slurry is fed into the coating liquid discharge unit 7 to remove air present inside the coating liquid discharge unit from the air vent passage 7.
2, the coating liquid can be discharged to the outside of the discharge section. At this time, if the pressure loss in the air vent passage 72 is made sufficiently smaller than the pressure loss in the small holes 71,... The air can be easily discharged to the outside. Specifically, the inner diameter of the air vent passage 72 may be set to be sufficiently larger than the inner diameter of the small hole 71 of the application liquid discharge section 7. In this manner, the air present inside the coating liquid discharge unit can be discharged to the outside of the coating liquid discharge unit through the air vent passage 72, so that the phosphor slurry sent to the coating liquid discharge unit 7 It is no longer possible to vigorously blow out from the small holes 71 together with the air present inside the discharge portion, and it is possible to prevent the surroundings of the small holes 71 from being stained with the phosphor slurry. Further, when the phosphor slurry sent into the coating liquid discharge unit 7 pushes out all the air present inside the coating liquid discharge unit through the air vent passage 72, and when the phosphor slurry starts to be discharged from the air vent passage 72, the air release is performed. Passage 7
By closing 2, all of the phosphor slurry sent to the application liquid discharge unit 7 is discharged from the plurality of small holes 71,. By performing this series of steps, the plurality of small holes 71,.
There is no contamination around 71. As a result, small holes 7
The lateral discharge of the phosphor slurry discharged from 1,..., 71 is eliminated, and the coating unevenness due to unpainted portions can be eliminated. In addition, it is possible to prevent the phosphor slurry from adhering, drying, and peeling around the small holes 71 and dropping as phosphor foreign matter on the inner surface of the front glass 2, and the phosphor slurry attached around the small holes is dried with time. The thickness unevenness caused by peeling and dropping can be eliminated. Therefore, it is possible to form a uniform phosphor screen of a coating pattern without coating unevenness and phosphor film thickness unevenness.

The present invention is not limited to the above embodiment, but can be implemented in various other modes.

For example, in the first embodiment, 51 cm
Although the size of the cathode ray tube is taken as an example, the invention is not limited to this. The liquid discharge flow rate and the sweep speed of the coating liquid discharge unit 7 can be freely adjusted according to the effective size of the front glass 2 of the cathode ray tube. It is.

In the first embodiment described above, the phosphor slurry is applied to the inner surface of the front glass 2 of the cathode ray tube. Any member can be used.

Further, the object to be coated may have a substantially flat plate shape without the outer peripheral wall 20.

Therefore, the present invention can be applied not only to a cathode ray tube but also to a liquid coating method for forming a thin film by coating a liquid on an object to be coated such as a semiconductor substrate, a liquid crystal substrate and an optical disk substrate. Needless to say.

(Second Embodiment) FIG. 7 is a perspective view showing a cathode ray tube manufacturing apparatus used in a method for manufacturing a cathode ray tube according to a second embodiment of the present invention, and FIG. 8 is a method for manufacturing a cathode ray tube according to the second embodiment. FIG. 2 is a partially cutaway side view of the cathode ray tube manufacturing apparatus used for the present invention.

In FIG. 7, the front glass 2 of a cathode ray tube of 51 cm size, for example, having an aspect ratio of 4: 3, which constitutes the cathode ray tube manufacturing apparatus 1 used in the method of manufacturing a cathode ray tube.
, A coating unit 4 and a coating liquid discharge unit 7
The moving unit 8 is the same as the cathode ray tube manufacturing apparatus used in the cathode ray tube manufacturing method according to the first embodiment.
Also, the same front glass 2 as the first embodiment can be used as the front glass 2 as the object. The cathode ray tube manufacturing apparatus used in the cathode ray tube manufacturing method according to the second embodiment is different from the cathode ray tube manufacturing apparatus used in the cathode ray tube manufacturing method according to the first embodiment in the following points. As shown in FIGS. 7 and 8, the coating liquid recovery tank 6 is disposed only on one side of the front glass 2. The cathode ray tube manufacturing apparatus used in the cathode ray tube manufacturing method according to the second embodiment does not use the shielding member 5 in the cathode ray tube manufacturing apparatus used in the cathode ray tube manufacturing method according to the first embodiment. As shown in FIG. 7, an air vent passage 72 and an air vent are provided substantially in the center of the upper portion of the application liquid discharge section 7 in the same manner as in the cathode ray tube manufacturing apparatus used in the cathode ray tube manufacturing method according to the first embodiment. A passage opening / closing means 73 is provided. In the cathode ray tube manufacturing apparatus used in the cathode ray tube manufacturing method according to the second embodiment, the air vent passage 72 is provided.
Is fixed inside the coating liquid recovery tank 6.

Based on the above-described cathode ray tube manufacturing apparatus used in the method for manufacturing a cathode ray tube according to the second embodiment, a process for manufacturing a cathode ray tube will be described below with reference to FIGS. .

First, in step S1, a dot or stripe-shaped black matrix is formed on the inner surface of the front glass 2 having a size of, for example, 51 cm by photolithography. Subsequently, as an example, a phosphor slurry containing a blue phosphor is prepared and prepared in the same manner as in the case of the apparatus used in the method for manufacturing a cathode ray tube according to the first embodiment, and a blue phosphor slurry tank such as the phosphor of FIG. It is held in the body slurry tank 100.

Next, in step S2, the pump 10
1 to drive the flow control valve 102 and the coating liquid supply pipe 85
, The blue phosphor slurry is sent from the inside of the blue phosphor slurry tank 100 to the coating solution discharge section 7, and the discharge of the phosphor slurry from the small holes 71,... The procedure for starting the discharge of the phosphor slurry is also performed in the same manner as in the cathode ray tube manufacturing apparatus used in the cathode ray tube manufacturing method according to the first embodiment. That is, after performing steps S52 to S55 of FIG. 5 at least once, the phosphor slurry is started to be discharged from the small holes 71,. In the meantime, similarly to the first embodiment, the blue phosphor slurry fed into the coating liquid discharge unit 7 gushes out of the small holes 71,..., 71 together with the air present inside the coating liquid discharge unit 7. Therefore, the periphery of the small hole 71 is not stained with the phosphor slurry. Therefore, the blue phosphor slurries 70,..., 70 discharged from the small holes 71,. Further, since the periphery of the small hole 71 is not stained with the blue phosphor slurry, the dried phosphor does not peel off and fall into the front glass 2. continue,
The supply amount of the blue phosphor slurry to be fed into the application liquid discharge section 7 is adjusted by the flow rate control valve 102, and the flow rate of the air vent passage 72 is adjusted by a ball valve as an example of the air vent passage opening / closing means 73. That is, as an example, when the blue phosphor slurry is continuously discharged from the small holes 71,..., 71 of the coating liquid discharge section 7, the plurality of small holes 71,. The total discharge flow rate of the discharged blue phosphor slurries 70,.
cc / min, and the amount of the blue phosphor slurry discharged into the coating liquid recovery tank 6 through the air vent passage 72 is adjusted to 50 cc / min. As described above, when the blue phosphor slurry is discharged from the plurality of small holes 71,..., 71 of the application liquid discharge unit 7, the small holes 71,.
Part of the blue phosphor slurry can be continuously discharged from the air vent passage 72 having a smaller liquid pressure loss than that of the blue phosphor slurry 71. Next, the flow control valve 102 is closed to temporarily stop the discharge of the blue phosphor slurry from the coating liquid discharge unit 7 for a predetermined time. After the stop operation, the flow control valve 102 is opened and the coating liquid is again The discharge resuming operation for resuming the discharge of the phosphor slurry from the discharge unit is repeated a predetermined number of times, and the inner surface of the front glass 2 is applied. The air vent passage opening / closing means 73 is always open. Small hole 7
When the discharge of the slurry from 1 is stopped, the phosphor slurry is continuously discharged from the air vent passage 72 in a small amount due to the residual liquid pressure inside the coating liquid discharge section 7. Therefore, the bubble removal is continuously performed even while the discharge from the small holes 71 is stopped.

In step S2, specifically, the following 2-1 step S21 to 2-8 step S
Operation 28 is performed.

That is, as the 2-1 step S21, the application liquid discharging section 7 is moved to a position immediately above the application liquid recovery tank 6 (position A in FIG. 8) by the blue phosphor slurries 70,.
When 0 is discharged, the supply of the blue phosphor slurry to the application liquid discharge section 7 is shut off. This shutoff is performed by the flow control valve 10.
As a second example, the opening can be performed by closing an opening / closing means such as a ball valve provided in the coating liquid supply pipe 85.
By this blocking operation, the small holes 71,.
The discharge of the blue phosphor slurry from 71 stops.

Subsequently, as a 2-2 step S22,
By driving the motor 84 of the moving section 8,
Are moved from the position A to the position of one end inside the front glass 2 (position B in FIG. 8) in a state where the discharge of the blue phosphor slurry from the small holes 71,.

The second to third steps S23 are the same as those in the flow control valve 1
By opening the ball valve as an example of 02, the supply of the blue phosphor slurry to the application liquid discharge unit 7 moved to the position B is restarted, and the small holes 71,.
The discharge of the blue phosphor slurry 70,...

In the second to fourth steps S24, the application liquid ejecting section 7 which has resumed ejection is moved from the position B to the inside of the front glass 2 at a speed of 200 mm / sec by driving the motor 84 of the moving section 8. Sweep is performed to the end position (position C in FIG. 8), and the blue phosphor slurry is applied to the inner surface of the front glass 2 in the outward path.

Subsequently, as a 2nd-5th step S25,
The application liquid discharging unit 7 is driven by the reverse drive of the motor 84 of the moving unit 8.
Is made a U-turn, that is, moved in the direction opposite to the moving direction of the forward path, and is swept from the position C to the position B at the same speed of 200 mm / sec as the sweep rate of the forward path.
Is further overlapped on the blue phosphor slurry applied on the outward path, and the blue phosphor slurry is applied on the return path.

When the application liquid ejecting section 7 returns to the position B, the application operation is again performed by closing the opening / closing means such as a ball valve as an example of the flow control valve 102 in the second to sixth step S26. The supply of the blue phosphor slurry to the liquid discharge section 7 is shut off, and the discharge of the blue phosphor slurry from the small holes 71, ..., 71 is stopped.

In the 2nd-7th step S27, the application liquid discharge section 7 in which the discharge of the blue phosphor slurry has been stopped is
From the position to the position A just above the coating liquid recovery tank 6.

Finally, as a 2-8th step S28, the supply of the blue phosphor slurry to the application liquid discharge section 7 which has returned to the position A is restarted, and the discharge of the blue phosphor slurry is restarted from the small holes 71,. I do.

After the 2-8 step S28, the process returns to the 2-1 step S21 again. After the cathode ray tube is carried out for the next step, another cathode ray tube is carried in and the other cathode ray tube is carried out. To start the application operation of the blue phosphor slurry, or the cathode ray tube is
The front glass 2 is relatively arranged along the longitudinal direction of the coating solution discharge section 7.
Is moved to apply the blue phosphor slurry to another portion inside the front glass 2.

As described above, according to the second embodiment,
When applying the blue phosphor slurry, small holes 71,.
Since part of the blue phosphor slurry is continuously discharged from the air vent passage 72 having a smaller liquid pressure loss than that of the 71, the 2-1 step S21 and the 2-3 step S2
3 and the supply of the blue phosphor slurry in the 2-6 step S26 and the 2-8 step S28, when the supply of the blue phosphor slurry is interrupted and restarted, the bubbles generated in the blue phosphor slurry by cavitation are removed from the air release passage 72 by the blue phosphor. It can be easily discharged to the coating liquid recovery tank 6 together with a part of the slurry, and the generation of the foam unevenness that has occurred when the air bubbles are applied to the inner surface of the front glass 2 without discharging the air bubbles can be eliminated. It has a further effect that it can be prevented. Further, when the application liquid discharge section 7 passes above the outer peripheral wall 20, the discharge of the blue phosphor slurry from the small holes 71, ..., 71 is stopped, and there is no shielding material 5 covering the outer peripheral wall 20. However, there is also a new effect that the outer peripheral wall 20 is not stained with the blue phosphor slurry.

The amount of the blue phosphor slurry discharged through the air vent passage 72 per unit time is 3 to 10% of the total discharge amount per unit time discharged from the plurality of small holes 71,. Is desirable. When the ratio greatly exceeds 10%, when the discharge of the blue phosphor slurry is restarted, the blue phosphor slurry is vigorously discharged from the air vent passage 72 side, the discharge of the liquid from the application liquid discharge unit 7 becomes weak, and the liquid jumps out. I do. If it is 3% or less, the air bubbles are not sufficiently discharged through the air vent passage 72, and a bubble unevenness defect of 0.67% occurs.

As described above, after the blue phosphor slurry is applied to the inner surface of the front glass 2 in step S2, in step S3, the holding section 3 is tilted and turned to sufficiently settle the blue phosphor particles. Deposit and dry excess water using a far infrared heater.

Further, in step S 4, the dried coating film 74 is exposed to ultraviolet light through a shadow mask, developed by washing with water, or the like, so that the blue fluorescent light is located at a predetermined position between the black matrices on the inner surface of the front glass 2. Form body dots.

Similarly, in steps S5 to S7, instead of the blue phosphor, a green phosphor (green phosphor manufactured by Nichia Chemical Co., having a particle diameter of 7 μm and a viscosity coefficient of the green phosphor slurry of 20 mPa · s) is used. Step S using
The same operation as in steps S2 to S4 is performed to form green phosphor dots at predetermined positions on the front glass 2 between the black matrices.

Thereafter, similarly, in steps S8 to S10, instead of the green phosphor, a red phosphor (a red phosphor manufactured by Nichia Corporation, having a particle diameter of 6 μm and a viscosity coefficient of the red phosphor slurry of 25 mPa · s) is used. The same operation as in steps S2 to S4 is performed using s), and red phosphor dots are formed at predetermined positions on the front glass 2 between the black matrices.

When the green phosphor slurry is applied, the amount of the green phosphor slurry discharged per unit time through the air vent passage 72 per unit time is the same as that of the blue phosphor slurry because its viscosity coefficient is almost the same. For some reason,
The discharge amount is set to 3 to 10% of the total discharge amount per unit time discharged from the plurality of small holes 71,. In addition, when applying the red phosphor slurry, the amount of red phosphor slurry per unit time discharged through the air vent passage 72 is higher in viscosity coefficient than the blue phosphor slurry and the green phosphor slurry, It is set to 5 to 12% of the total discharge amount per unit time discharged from the plurality of small holes 71,. The higher the viscosity coefficient, the more difficult it is to discharge air bubbles. Therefore, the discharge amount is set to be larger than in the case of the blue phosphor slurry or the green phosphor slurry. By setting as such, when the discharge of the red phosphor slurry is resumed, similarly to the blue phosphor slurry or the green phosphor slurry, the red phosphor slurry is vigorously discharged from the air vent passage side, and the coating liquid discharge unit It is possible to reliably prevent the liquid from being weakly ejected from causing the liquid to fly laterally, or to prevent the bubbles from being sufficiently discharged through the air vent passage, thereby causing a non-uniformity of, for example, 0.67%. In addition, the phosphor used at this time may be one coated with a pigment of the same color so as to absorb light of another color and reflect only its own color, and the particle diameter of the phosphor is also limited to this. Not something.

Thus, in steps S2 to S10, blue phosphor dots, green phosphor dots, and
After forming red phosphor dots at predetermined positions between the black matrices on the front glass 2, step S
At 11, a metal back layer is formed by aluminum deposition via a lacquer film.

Subsequently, in step S12, the front glass 2 on which the phosphor has been formed and the funnel are joined by a glass frit, an electron gun is sealed, and a cathode ray tube is manufactured by vacuum evacuation.

At this time, the phosphor coating film 74 formed on the inner surface of the front glass 2 is not coated with uneven stripes due to uncoated portions,
It is possible to form a uniform film without unevenness in film thickness due to the fall of phosphor foreign matter (for example, the defect rate of coating streaks is 1.12).
% To 0.25%, and the film thickness unevenness defect rate due to phosphor foreign matter falling from 0.77% to 0.31%. ). In addition, even when the supply of the phosphor slurry is interrupted and restarted to perform application, a uniform film without bubble unevenness can be realized (for example, the bubble unevenness defective rate is from 1.56% to 0.18%).
%. ). Also, as an example, as a result of measuring the luminance of the produced cathode ray tube, high luminance (peripheral luminance distribution average value 97%, worst value 95%) and stable color difference (x direction 3 / 1000, y direction 5
/ 1000).

According to the second embodiment, in addition to the functions and effects of the first embodiment, the application liquid discharge section 7 is swept in one direction by a one-way operation or a reciprocating operation, so that the inner surface of the front glass 2 is swept. When the phosphor coating film 74 is applied, a part of the phosphor slurry supplied to the inside of the coating liquid discharge unit 7 is passed through the air vent passage 72 to the coating liquid discharge unit 7.
And a step of continuously discharging the coating solution to the outside of the
The step of temporarily stopping the discharge of the phosphor slurry from the application liquid discharge unit 7 by including a step of repeating a stop operation of temporarily stopping the discharge of the phosphor slurry from the liquid discharge unit and a discharge restart operation of restarting the discharge. Even if the application and the discharge resuming operation for resuming the discharge are repeated, a uniform phosphor screen without bubble unevenness can be realized at a high level. Therefore, its practical effects are significant.

That is, when the discharge of the phosphor slurry from the application liquid discharge section 7 is repeatedly stopped and resumed by opening and closing the piping for supplying the phosphor slurry, the supply of the phosphor slurry for cavitation is repeated. Bubbles are generated in the phosphor slurry in the pipe passage.
By continuously discharging the coating liquid together with the coating liquid from the air vent passage 72 provided separately from the coating liquid discharge section 7, it is possible to form a uniform coating film without bubble unevenness.

At this time, if the liquid pressure loss in the air vent passage 72 is made sufficiently smaller than the liquid pressure loss in the small holes 71 of the coating liquid discharge part 7, the liquid pressure loss in the coating liquid discharge part 7 through the air vent passage 72 can be reduced. The discharged air can be more easily and more reliably discharged to the outside. Specifically, the inner diameter of the air vent passage 72 may be set to be sufficiently larger than the inner diameter of the small hole 71 of the application liquid discharge unit 7. Therefore, the application liquid discharging unit 7
The phosphor slurry discharge from the
When bubbles are generated in the phosphor slurry when repeating the above steps, the bubbles are removed together with the phosphor slurry by the front glass 2.
Because it is not applied to the inner surface of the glass, there is no tail-like coating unevenness due to bubbles when the front glass is tilted and swirled after coating, and it is possible to realize a highly uniform fluorescent screen with a uniform coating pattern. Becomes The amount of phosphor slurry discharged from the air vent passage 72 per unit time is
It is desirable that the amount of the phosphor slurry discharged from the plurality of small holes 71,... If the ratio greatly exceeds 10%, when the phosphor slurry discharge is restarted, the phosphor slurry flows out vigorously from the air vent passage side 72, and the liquid discharge from the application liquid discharge unit 7 becomes weak, causing a liquid side jump. is there.

The present invention is not limited to the above-described second embodiment, but can be implemented in various other modes.

For example, in the second embodiment, a cathode ray tube having a size of 51 cm has been described as an example. However, the present invention is not limited to this, and according to the effective size of the front glass 2 of the cathode ray tube,
The liquid discharge flow rate and the sweep speed of the coating liquid discharge section 7 can be freely adjusted. In the second embodiment, a specific example of reciprocal coating has been described. However, it goes without saying that one-way coating may be performed by installing a coating liquid recovery tank 6 on both sides of the front glass 2. Furthermore, in the second embodiment, in the application operation, when the application liquid discharge unit 7 is U-turned, the application liquid discharge unit 7 is not moved in the longitudinal direction, but the application liquid discharge unit 7 is moved in the longitudinal direction. It is made movable, and when it comes to the U-turn position, the application liquid discharge section 7 is inserted into the small holes 71,.
It is also possible to move by about a half pitch of one hole arrangement interval. In this manner, the coating films 70 can be formed at intervals smaller than the intervals between the small holes 71,..., 71, and a more uniform coating film can be efficiently formed.

As shown in FIG. 11, in the apparatus shown in FIG. 1 or the apparatus shown in FIG. 7, a control unit 200 is further provided, and the control unit 200 is provided with a motor 84 of the moving unit 8 and an air vent of the discharge mechanism 150. The passage opening / closing means 73, the flow regulating valve 102, the pump 101, the swirling section 30 and the like are connected so that the respective operations can be controlled.
, 70, a stop operation for temporarily stopping the discharge of the phosphor slurries 70,... 70 from the small holes 71,. Thereafter, the phosphor slurries 70,..., 7 from the small holes 71,.
Control may be performed so that the discharge restart operation for restarting the discharge of 0 is automatically and repeatedly performed. In addition, bubbles generated in the phosphor slurry in the phosphor slurry supply pipe by the discharge mechanism 150 are continuously discharged to the outside of the application liquid discharge unit 7 through the air vent passage 72 together with a part of the phosphor slurry. The discharge operation can be performed by adjusting the degree of opening / closing of a ball valve as an example of the air vent passage opening / closing means 73 of the discharge mechanism 150 by the control unit 200, and then leaving the ball valve always open.

In the second embodiment, the phosphor slurry is applied to the inner surface of the front glass 2 of the cathode ray tube. However, other than the front glass 2, various coating liquids having a similar structure are applied. Any member can be used.

Further, the object to be coated may have a substantially flat plate shape without the outer peripheral wall 20.

Therefore, the present invention can be applied not only to a cathode ray tube but also to a liquid coating method for forming a thin film by applying a liquid to an object to be coated such as a semiconductor substrate, a liquid crystal substrate, and an optical disk substrate. Needless to say.

[0093]

As described above, according to the method for manufacturing a cathode ray tube according to the first aspect of the present invention, when starting the discharge of the phosphor slurry from the coating liquid discharge section, the coating liquid discharge section receives the phosphor slurry. A step of opening an air vent passage provided in the coating liquid discharge unit separately from the small holes before feeding the phosphor slurry, and a step of feeding the phosphor slurry to the coating liquid discharge unit after opening the air vent passage. Closing the air vent passage after discharging the air remaining in the application liquid discharge unit together with the phosphor slurry from the air vent passage to the outside of the coating liquid discharge unit. Therefore, when starting to discharge the phosphor slurry from the application liquid discharge unit, the air vent passage provided separately from the plurality of small holes of the application liquid discharge unit is first opened, and then the fluorescent liquid is supplied to the application liquid discharge unit. By sending the body slurry, the air present inside the application liquid discharge unit can be discharged to the outside of the application liquid discharge unit through the air vent passage. At this time, if the pressure loss of the air vent passage is made sufficiently smaller than the pressure loss of the small hole of the application liquid discharge portion, the air present inside the application liquid discharge portion can be easily discharged to the outside from the air vent passage. be able to. In this way, the air present inside the application liquid ejection unit is passed through the air vent passage.
Since the phosphor slurry sent to the application liquid discharge unit can be discharged to the outside of the application liquid discharge unit, the phosphor slurry does not spout vigorously from the small holes together with the air present inside the application liquid discharge unit. It is possible to eliminate contamination of the periphery of the hole with the phosphor slurry. Further, the phosphor slurry fed into the application liquid ejection section pushes out all the air present inside the application liquid ejection section through the air vent passage, and closes the air vent passage when the phosphor slurry starts to be discharged from the air vent passage. Thus, all of the phosphor slurry sent to the application liquid discharge unit is discharged from the plurality of small holes. By performing this series of steps, the phosphor slurry does not stain the periphery of the plurality of small holes provided in the application liquid discharge section. as a result,
The phosphor slurry discharged from the small holes does not fly laterally, and coating unevenness due to unpainted portions can be eliminated. Further, it is possible to prevent the phosphor slurry from adhering, drying, and peeling around the small holes and dropping as phosphor foreign matter on the inner surface of the front glass. The film thickness unevenness caused by dropping can be eliminated.
Therefore, it is possible to form a uniform phosphor screen of a coating pattern without coating unevenness and phosphor film thickness unevenness.

According to the method for manufacturing a cathode ray tube according to the second aspect of the present invention, in the first aspect, the coating liquid discharge section is swept in one direction by one-way operation or reciprocating operation so that the fluorescent light is applied to the inner surface of the front glass. A step of continuously discharging a part of the phosphor slurry supplied to the inside of the coating liquid discharge section to the outside of the coating liquid discharge section through the air vent passage when forming the body coating film; A stop operation for temporarily stopping the discharge of the phosphor slurry from the small holes of the portion, and a discharge restarting operation for restarting the discharge of the phosphor slurry from the small holes of the application liquid discharge unit after the stop. A repetition step of repeating the above. When the discharge resumption operation is performed after the stop operation in the repetition step, the emission of the phosphor slurry into the phosphor slurry supply pipe path is performed. The air bubbles, together with a part of the phosphor slurry, and configured to perform the discharge step of continuously discharging to the outside of the coating solution discharge section through the air vent passage. Therefore, in addition to the operation and effect of the first aspect, a stop operation for temporarily stopping the discharge of the phosphor slurry from the coating liquid discharge unit and a discharge restart operation for restarting the discharge of the phosphor slurry again after the stop are performed. Even if you repeat,
Bubbles are generated in the phosphor slurry in the phosphor slurry supply pipe due to cavitation, and the generated bubbles are transferred to the coating liquid through an air vent passage provided separately from the plurality of small holes of the coating liquid discharge unit. The coating liquid can be discharged to the outside of the discharge section together with the coating liquid, and a uniform phosphor screen without bubble unevenness can be realized with high accuracy.

According to the method of manufacturing a cathode ray tube according to the third aspect of the present invention, in the second aspect, the coating liquid discharge section is swept in one direction by one-way operation or reciprocating operation so that the fluorescent light is applied to the inner surface of the front glass. When applying the body coating film,
Of the phosphor slurry discharged from the air vent passage, the discharge amount per unit time of the blue phosphor slurry or the green phosphor slurry, the blue phosphor slurry discharged from the whole of the plurality of small holes of the coating liquid discharge unit or The discharge amount of the green phosphor slurry per unit time is configured to be 3 to 10%. Therefore, in addition to the effect of the second aspect, when the phosphor slurry is a blue phosphor slurry or a green phosphor slurry, the discharge amount per unit time discharged from the air vent passage and the discharge amount of the coating liquid discharge unit By setting the relationship between the discharge amount per unit time discharged from the plurality of small holes within the above range, when the discharge of the blue phosphor slurry or the green phosphor slurry is resumed, the blue phosphor slurry or The green phosphor slurry will be discharged vigorously, and the liquid discharge from the application liquid discharge unit is weakened, and the liquid lateral jump occurs, or
It is possible to reliably prevent the bubbles from being sufficiently exhausted through the air vent passage, and to cause, for example, a defect of the foam unevenness of 0.67%.

According to the method of manufacturing a cathode ray tube according to the fourth aspect of the present invention, in the second or third aspect, the coating liquid discharge section is swept in one direction by one-way operation or reciprocating operation so that the inner surface of the front glass is swept. When applying the phosphor coating film, the discharge amount per unit time of the red phosphor slurry of the phosphor slurry discharged from the air vent passage is the unit time of the red phosphor slurry discharged from the plurality of small holes as a whole. It is configured to be 5 to 12% of the discharge amount per unit. Therefore, in addition to the effects of the second or third aspect, when the phosphor slurry is a red phosphor slurry, the viscosity coefficient of the red phosphor slurry is smaller than the viscosity coefficient of the blue phosphor slurry or the green phosphor slurry. Because of the high viscosity coefficient, bubbles are difficult to be discharged due to the high viscosity coefficient. Therefore, the discharge amount is set to be larger than in the case of the blue phosphor slurry or the green phosphor slurry. Therefore, by setting the relationship between the discharge amount per unit time discharged from the air vent passage and the discharge amount per unit time discharged from the plurality of small holes of the coating liquid discharge unit within the above range,
When the discharge of the red phosphor slurry is restarted, the red phosphor slurry will be discharged vigorously from the air vent passage side, and the liquid discharge from the application liquid discharge unit is weakened, and the liquid lateral jump occurs, or In addition, it is possible to reliably prevent the bubbles from being sufficiently exhausted through the air vent passage, and to cause the occurrence of, for example, a 0.67% bubble unevenness defect.

According to the method for manufacturing a cathode ray tube according to the fifth aspect of the present invention, in any one of the second to fourth aspects, in the repetition step, the application liquid discharging portion may be positioned above the outer peripheral wall of the front glass. Is configured to temporarily stop the discharge of the phosphor slurry from the coating liquid discharge unit when passing through. Therefore, in addition to the above effects,
When the coating liquid discharge section passes above the outer peripheral wall of the front glass, the discharge of the phosphor slurry from the small holes is stopped. Therefore, even if there is no shielding material covering the outer peripheral wall, the outer peripheral wall is coated with the phosphor slurry. It doesn't get dirty.

According to the liquid application method of the sixth aspect of the present invention, when the application liquid is started to be ejected from the application liquid ejection section, the application liquid is supplied separately from the small holes before the application liquid is fed into the application liquid ejection section. A step of opening an air vent passage provided in the application liquid discharge section, a step of feeding the application liquid to the application liquid discharge section after opening the air release passage, and a step of opening the application liquid discharge section together with the application liquid from the air release passage. Closing the air vent passage after exhausting the air remaining inside to the outside of the application liquid discharge section. Therefore, when the application liquid is started to be discharged from the application liquid discharge unit, the air vent passage provided separately from the plurality of small holes of the application liquid discharge unit is first opened, and then the coating liquid is supplied to the application liquid discharge unit. , The air present inside the application liquid discharge unit can be discharged to the outside of the application liquid discharge unit through the air vent passage. At this time, if the pressure loss of the air vent passage is made sufficiently smaller than the pressure loss of the small hole of the application liquid discharge portion, the air present inside the application liquid discharge portion can be easily discharged to the outside from the air vent passage. be able to. In this manner, the air present inside the application liquid discharge unit can be discharged to the outside of the application liquid discharge unit through the air vent passage, so that the application liquid sent to the application liquid discharge unit can be discharged inside the application liquid discharge unit. Is no longer spouted vigorously from the small holes together with the air present in the small holes, and the surroundings of the small holes can be prevented from being stained with the coating liquid. In addition, the coating liquid sent to the coating liquid discharge section pushes out all the air present inside the coating liquid discharge section through the air release passage, and when the coating liquid starts to be discharged from the air release passage, the air release passage is closed. All of the application liquid sent to the application liquid discharge unit is discharged from the plurality of small holes. By performing this series of steps, the coating liquid does not stain the periphery of the plurality of small holes provided in the coating liquid discharge unit. As a result, the coating liquid discharged from the small holes does not fly laterally, and coating unevenness due to unpainted portions can be eliminated. In addition, it is possible to prevent the coating liquid from adhering, drying and peeling around the small holes and dropping as a foreign substance on the inner surface of the object to be coated, and the coating liquid adhered around the small holes is dried, peeled and dropped with time. The generated film thickness unevenness can be eliminated. Therefore, it is possible to form a uniform coating surface of a coating pattern without coating unevenness and coating film thickness unevenness.

According to the liquid application method of the seventh aspect of the present invention, in the sixth aspect, the application liquid ejecting section is swept in one direction by one-way operation or reciprocating operation to form an application film on the object to be applied. A step of continuously discharging a part of the coating liquid supplied to the inside of the coating liquid discharging section to the outside of the coating liquid discharging section through an air vent passage; and coating the coating liquid from the small hole of the coating liquid discharging section. The method further comprises: a repetition step of repeating a stop operation for temporarily stopping liquid ejection and a resumption of ejection for resuming the application liquid ejection. When performing the ejection resumption operation after the stop operation in the repetition step, the application liquid The discharging step of continuously discharging bubbles generated in the coating liquid in the supply pipe path, together with a part of the coating liquid, to the outside of the coating liquid discharge unit through the air vent passage. It is configured to Migihitsuji. Therefore, in addition to the operation and effect of the sixth aspect, even if the stop operation of temporarily stopping the application liquid discharge from the application liquid discharge unit and the discharge restart operation of restarting the discharge of the application liquid after the stop are repeated. Air bubbles are generated in the application liquid in the application liquid supply pipe due to cavitation, and the generated bubbles are discharged from an air vent passage provided separately from the plurality of small holes of the application liquid discharge section. It can be discharged together with the coating liquid to the outside of the section, and a uniform coating film without bubble unevenness can be formed.

According to the cathode ray tube manufacturing apparatus of the eighth aspect of the present invention, it has a plurality of small holes and an air vent passage provided separately from the small holes, and discharges the phosphor slurry from the small holes. A coating liquid discharging unit, a moving unit that sweeps the coating liquid discharging unit in one direction by one-way operation or reciprocating operation, and a sweeping unit that sweeps the coating liquid discharging unit in one direction by one-way operation or reciprocating operation. When forming the phosphor coating film on the inner surface, when starting to discharge the phosphor slurry from the coating liquid discharge unit, the coating liquid is separated from the small holes before the phosphor slurry is sent to the coating liquid discharge unit. The air vent passage provided in the discharge unit is opened, and air remaining inside the coating liquid discharge unit together with the phosphor slurry is discharged from the air vent passage to the outside of the coating liquid discharge unit. Later, are configured with the air vent passage opening and closing means for closing said air vent passageway, and a phosphor slurry dispenser for feeding the phosphor slurry in the coating solution discharge portion after opening the air vent passage. Therefore, when starting to discharge the phosphor slurry from the application liquid discharge unit, the air vent passage provided separately from the plurality of small holes of the application liquid discharge unit is first opened by the air vent passage opening / closing means, and then, By sending the phosphor slurry to the coating liquid discharge unit by the phosphor slurry supply device, air present inside the coating liquid discharge unit can be discharged to the outside of the coating liquid discharge unit through the air vent passage.
At this time, if the pressure loss of the air vent passage is made sufficiently smaller than the pressure loss of the small hole of the application liquid discharge portion, the air present inside the application liquid discharge portion can be easily discharged to the outside from the air vent passage. be able to. In this manner, the air present inside the coating liquid discharge section can be discharged to the outside of the coating liquid discharge section through the air vent passage, so that the phosphor slurry fed into the coating liquid discharge section is used. It is no longer possible to vigorously blow out from the small holes together with the air present inside, so that it is possible to prevent the surroundings of the small holes from being stained with the phosphor slurry. Further, the phosphor slurry fed into the coating liquid discharge section by the phosphor slurry supply device pushes out all the air present inside the coating liquid discharge section through the air vent passage, and the phosphor slurry starts to be discharged from the air vent passage. At this time, by closing the air vent passage by the air vent passage opening / closing means, all of the phosphor slurry sent to the application liquid discharge unit is discharged from the plurality of small holes. By performing this series of operations, the phosphor slurry does not stain the periphery of the plurality of small holes provided in the application liquid discharge section. As a result, the phosphor slurry discharged from the small holes does not fly laterally, and coating unevenness due to unpainted portions can be eliminated. Further, it is possible to prevent the phosphor slurry from adhering, drying, and peeling around the small holes and dropping as phosphor foreign matter on the inner surface of the front glass. The film thickness unevenness caused by dropping can be eliminated. Therefore, it is possible to form a uniform phosphor screen of a coating pattern without coating unevenness and phosphor film thickness unevenness.

According to the cathode ray tube manufacturing apparatus of the ninth aspect of the present invention, in the eighth aspect, the coating liquid discharge section is
When a phosphor coating film is formed on the inner surface of the front glass by being swept in one direction by a one-way operation or a reciprocating operation, a part of the phosphor slurry supplied to the inside of the coating liquid discharge unit is passed through the air vent passage. A discharge mechanism for continuously discharging the coating liquid discharge unit to the outside, a stop operation for temporarily stopping discharge of the phosphor slurry from the small holes of the coating liquid discharge unit, and a discharge of the coating liquid again after the stop. And a control section for repeatedly performing a discharge resuming operation for resuming the discharge of the phosphor slurry from the small holes of the section, wherein the control section controls the discharge mechanism when performing the discharge resuming operation after the stop operation. By this, the bubbles generated in the phosphor slurry in the phosphor slurry supply pipe line, together with a part of the phosphor slurry, are applied through the air vent passage to the coating. It is configured to be continuously discharged to the outside of the discharge portion. Therefore, even when the control unit repeats the stop operation of temporarily stopping the discharge of the phosphor slurry from the application liquid discharge unit and the discharge restart operation of restarting the discharge of the phosphor slurry again after the stop, the cavitation may occur. Bubbles are generated in the phosphor slurry in the phosphor slurry supply pipe line, and the generated bubbles are discharged by the discharge mechanism from an air vent passage provided separately from the plurality of small holes of the application liquid discharge unit. The coating liquid can be discharged to the outside of the coating liquid discharge section together with the coating liquid, and a uniform fluorescent screen without bubble unevenness can be realized with high accuracy.

According to the cathode ray tube manufacturing apparatus of the tenth aspect of the present invention, in the ninth aspect, the control unit sweeps the coating liquid discharging unit in one direction by one-way operation or reciprocating operation to thereby form the inner surface of the front glass. When the phosphor coating film is coated on the substrate, the discharge mechanism is configured such that the discharge amount per unit time of the blue phosphor slurry or the green phosphor slurry of the phosphor slurry discharged from the air vent passage is equal to the discharge amount of the coating liquid. The discharge amount of the blue phosphor slurry or the green phosphor slurry discharged from the whole of the plurality of small holes is controlled to be 3 to 10% of the discharge amount per unit time. Therefore, when the phosphor slurry is a blue phosphor slurry or a green phosphor slurry, the discharge amount per unit time discharged from the air vent passage and the unit time discharged from the whole of the plurality of small holes of the application liquid discharge unit. By setting the relationship with the discharge amount within the above range,
When the discharge of the blue phosphor slurry or the green phosphor slurry is restarted, the blue phosphor slurry or the green phosphor slurry is discharged vigorously from the air vent passage side, and the liquid discharge from the application liquid discharge unit becomes weak. Therefore, it is possible to reliably prevent the occurrence of horizontal liquid splashing or the insufficient discharge of air bubbles through the air vent passage, and the occurrence of, for example, a 0.67% bubble unevenness defect.

According to the liquid application apparatus of the eleventh aspect of the present invention, in the ninth or tenth aspect, the control unit causes the application liquid discharge unit to be swept in one direction by one-way operation or reciprocating operation so that the front glass is removed. When applying the phosphor slurry film to the inner surface, the discharge mechanism is configured such that the discharge amount per unit time of the red phosphor slurry discharged from the air vent passage is the unit time of the red phosphor slurry discharged from the plurality of small holes. It is configured to control the discharge amount per hit to be 5 to 12%. Therefore, when the phosphor slurry is a red phosphor slurry, the viscosity coefficient of the red phosphor slurry is higher than the viscosity coefficient of the blue phosphor slurry or the green phosphor slurry. Therefore, the discharge amount is set to be larger than in the case of the blue phosphor slurry or the green phosphor slurry. Accordingly, by setting the relationship between the discharge amount per unit time discharged from the air vent passage and the discharge amount per unit time discharged from the plurality of small holes of the coating liquid discharge unit within the above range, the red phosphor When the discharge of the slurry is restarted, the red phosphor slurry will be discharged vigorously from the air vent passage side, and the liquid discharge from the application liquid discharge section will weaken, causing liquid side jump, or bubbles will be generated. It is possible to reliably prevent the insufficient discharge through the air vent passage and the occurrence of, for example, a defect of 0.67% of uneven foam.

According to the liquid application apparatus of the twelfth aspect of the present invention, in any one of the ninth to eleventh aspects, the control unit may be configured such that the application liquid discharge unit passes above the outer peripheral wall of the front glass. In this case, the discharge of the phosphor slurry from the application liquid discharge unit is controlled to be temporarily stopped. Therefore, when the coating liquid discharge section passes above the outer peripheral wall, the discharge of the phosphor slurry from the small holes is stopped, so that even if there is no shielding material covering the outer peripheral wall, the outer peripheral wall is made of the phosphor slurry. It also has a new effect of not polluting.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a configuration of a cathode ray tube manufacturing apparatus used in a method of manufacturing a cathode ray tube according to a first embodiment of the present invention.

FIG. 2 is a partially cutaway side view of the cathode ray tube manufacturing apparatus used in the cathode ray tube manufacturing method according to the first embodiment.

FIG. 3 is a bottom view of a coating liquid discharge unit in the cathode ray tube manufacturing apparatus used in the method for manufacturing a cathode ray tube according to the first embodiment.

FIG. 4 is a flowchart showing steps of a method for manufacturing a cathode ray tube according to the first embodiment.

FIG. 5 is a diagram illustrating a cathode ray tube manufacturing method according to the first embodiment. It is a flowchart which shows the detailed process performed.

FIG. 6 is a schematic cross-sectional view of a coating liquid discharge unit in the cathode ray tube manufacturing apparatus used in the cathode ray tube manufacturing method according to the first embodiment.

FIG. 7 is a perspective view illustrating a configuration of a cathode ray tube manufacturing apparatus used in a method of manufacturing a cathode ray tube according to a second embodiment of the present invention.

FIG. 8 is a partially cutaway side view of the cathode ray tube manufacturing apparatus used in the cathode ray tube manufacturing method according to the second embodiment.

FIG. 9 is a flowchart showing steps of a method for manufacturing a cathode ray tube according to the second embodiment.

FIG. 10 is a flowchart showing details of a repetitive operation of a discharge / stop operation and a discharge restart operation of the phosphor slurry in the method of manufacturing the cathode ray tube of FIG. 4;

FIG. 11 is a block diagram of a control part of a cathode ray tube manufacturing apparatus used in a cathode ray tube manufacturing method according to another embodiment of the present invention.

FIG. 12 is a flowchart showing detailed steps of an operation for forming phosphor dots using phosphor slurry in the steps of the method for manufacturing a cathode ray tube according to the first embodiment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Cathode ray tube manufacturing apparatus, 2 ... Front glass, 3 ... Holding part,
4 ... coating part, 5 ... shielding material, 6 ... coating liquid recovery tank, 7 ...
Coating liquid discharge section, 8 moving section, 20 outer peripheral wall, 21 center plane section, 30 turning section, 70 phosphor slurry, 71 small hole, 72 air vent passage, 73 air vent passage opening / closing means, 74 ... Coating film, 80: Guide rail, 81: Ball screw shaft, 82: End member, 83: End member, 84: Motor, 85: Coating liquid supply pipe, 100: Phosphor slurry tank, 101: Pump, 102: Flow control valve , 150: discharge mechanism, 200: control unit.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) B05D 1/26 B05D 1/26 Z 7/00 7/00 E H 7/22 7/22 Z (72) Inventor Nobuyuki Aoki 1-1, Komachi, Takatsuki-shi, Osaka F-term (reference) 4D075 AC08 AC09 AC84 DA19 DB13 DC21 4F033 AA14 BA06 CA07 DA05 EA01 HA02 NA01 4F035 AA04 CD03 CE02 4F041 AA05 BA13 BA34 BA51 BA56 5C028 HH04

Claims (12)

[Claims] An inner surface of a front glass of a cathode ray tube on which a dot or stripe black matrix is formed in advance,
A method for manufacturing a cathode ray tube, comprising a step of applying a phosphor slurry, exposing and developing to form a phosphor of each color between the black matrices, comprising a plurality of small holes, and discharging the phosphor slurry from the small holes. When forming the phosphor coating film on the inner surface of the front glass by sweeping the coating liquid discharge section in one direction by one-way operation or reciprocating operation, when starting to discharge the phosphor slurry from the coating liquid discharge section, the coating liquid A step of opening an air vent passage provided in the coating liquid discharge section separately from the small holes before feeding the phosphor slurry to the discharge section; and a step of opening the phosphor slurry in the coating liquid discharge section after opening the air vent path. And discharging air remaining inside the coating liquid discharge unit together with the phosphor slurry from the air vent passage to the outside of the coating liquid discharge unit. Later, the production method of a cathode ray tube, characterized in that it comprises a step of closing said air vent passageway. 2. The method according to claim 1, wherein the application liquid ejecting unit is swept in one direction by a one-way operation or a reciprocating operation to form the phosphor coating film on the inner surface of the front glass. Continuously discharging a part of the phosphor slurry to the outside of the coating liquid discharge section through the air vent passage; and stopping temporarily discharging the phosphor slurry from the small hole of the coating liquid discharge section. The method further comprises: a repetition step of repeating an operation and a discharge resuming operation of resuming the discharge of the phosphor slurry from the small holes of the application liquid discharging unit after the stop. When performing the operation, air bubbles generated in the phosphor slurry in the phosphor slurry supply pipe line are passed through the air vent passage together with a part of the phosphor slurry. A cathode ray tube manufacturing method according to claim 1 to perform the discharge step of continuously discharging to the outside of the coating solution discharge section Te. 3. The phosphor slurry discharged from the air vent passage when the phosphor coating film is applied to the inner surface of the front glass by sweeping the coating liquid discharge section in one direction by one-way operation or reciprocating operation. The discharge amount of the blue phosphor slurry or the green phosphor slurry per unit time is 3 times of the discharge amount of the blue phosphor slurry or the green phosphor slurry discharged from the whole of the plurality of small holes of the coating liquid discharge unit. The method for producing a cathode ray tube according to claim 2, wherein the content is 10% to 10%. 4. When applying the phosphor coating film on the inner surface of the front glass by sweeping the coating liquid discharge section in one direction by one-way operation or reciprocating operation, the phosphor slurry discharged from the air vent passage is used. The discharge amount per unit time of the red phosphor slurry is 5 times the discharge amount per unit time of the red phosphor slurry discharged from the plurality of small holes.
The method for producing a cathode ray tube according to claim 2 or 3, wherein the content is about 12%. 5. The method according to claim 1, wherein in the repetition step, the discharge of the phosphor slurry from the coating liquid discharge unit is temporarily stopped when the coating liquid discharge unit passes above the outer peripheral wall of the front glass. Item 5. The method for producing a cathode ray tube according to any one of Items 2 to 4. 6. A coating liquid discharging section having a plurality of small holes and discharging a coating liquid from the small holes is swept in one direction by a one-way operation or a reciprocating operation to apply the coating liquid to an object to be coated. In the liquid coating method for forming a film, when the coating liquid is started to be discharged from the coating liquid discharge section, the coating liquid is provided in the coating liquid discharge section separately from the small holes before sending the coating liquid to the coating liquid discharge section. A step of opening the air vent passage; a step of sending the coating liquid to the coating liquid discharge unit after opening the air vent passage; and a step of discharging the air remaining inside the coating liquid discharge unit together with the coating liquid from the air vent passage. Closing the air vent passage after discharging the air to the outside of the unit. 7. When forming a coating film on the object to be coated by sweeping the coating liquid discharge section in one direction by one-way operation or reciprocating operation, one of the coating liquid supplied to the inside of the coating liquid discharge section. Continuously discharging the coating liquid to the outside of the coating liquid discharge unit through the air vent passage; stopping the coating liquid discharge from the small holes of the coating liquid discharge unit temporarily; and restarting the coating liquid discharge And a repetition step of repeating the discharge resumption to be performed.When the discharge resumption operation is performed after the stop operation in the repetition step, bubbles generated in the coating liquid in the coating liquid supply pipe line are removed by applying 7. The liquid applying method according to claim 6, wherein the discharging step of continuously discharging the coating liquid to the outside of the coating liquid discharging section through the air vent passage is performed together with a part thereof. 8. An inner surface of a front glass of a cathode ray tube in which a dot or stripe black matrix is formed in advance,
In a cathode ray tube manufacturing apparatus having a step of applying a phosphor slurry, exposing and developing to form a phosphor of each color between the black matrices, the apparatus has a plurality of small holes and an air vent passage provided separately from the small holes. A coating liquid discharging unit that discharges the phosphor slurry from the small holes, a moving unit that sweeps the coating liquid discharging unit in one direction by a one-way operation or a reciprocating operation, and moves the coating liquid discharging unit in one direction. When a phosphor coating film is formed on the inner surface of the front glass by being swept by one-way operation or reciprocating operation, when starting to discharge the phosphor slurry from the coating liquid discharge section, the phosphor slurry is applied to the coating liquid discharge section. Before feeding, open the air vent passage provided in the application liquid discharge part separately from the small holes, and remove the phosphor slurry from the air vent passage with the phosphor slurry. An air vent passage opening / closing means for closing the air vent passage after discharging air remaining inside the application liquid ejecting section to the outside of the coating liquid ejecting section; and forming the phosphor slurry in the coating liquid ejecting section after opening the air vent passage And a phosphor slurry supply device for feeding the phosphor. 9. When the coating liquid discharge section is swept in one direction by a one-way operation or a reciprocating operation to form a phosphor coating film on the inner surface of the front glass, the supply liquid supplied to the inside of the coating liquid discharge section is formed. A discharge mechanism for continuously discharging a part of the phosphor slurry to the outside of the coating liquid discharge section through the air vent passage; and temporarily stopping discharge of the phosphor slurry from the small hole of the coating liquid discharge section. And a control unit for repeatedly performing a discharge restart operation for restarting discharge of the phosphor slurry from the small holes of the coating liquid discharge unit after the stop operation, and a stop operation in the control unit. When performing the discharge resuming operation later, by the discharge mechanism, the bubbles generated in the phosphor slurry in the phosphor slurry supply piping, together with a part of the phosphor slurry A cathode ray tube manufacturing apparatus according to claim 8 which continuously discharged to the outside of the coating solution discharge section through the air vent passage. 10. When applying the phosphor coating film on the inner surface of the front glass by sweeping the coating liquid discharge unit in one direction by one-way operation or reciprocating operation by the control unit,
The discharge mechanism discharges a blue phosphor slurry or a green phosphor slurry per unit time of the phosphor slurry discharged from the air vent passage from the entire plurality of small holes of the application liquid discharge unit. The discharge amount of the blue phosphor slurry or the green phosphor slurry per unit time is 3
The cathode ray tube manufacturing apparatus according to claim 9, wherein the control is performed so as to be 10% to 10%. 11. When applying the phosphor slurry film on the inner surface of the front glass by sweeping the coating liquid discharge unit in one direction by one-way operation or reciprocating operation by the control unit.
The discharge mechanism may be configured such that a discharge amount per unit time of the red phosphor slurry discharged from the air vent passage is 5 to 12% of a discharge amount per unit time of the red phosphor slurry discharged from the plurality of small holes. The apparatus for manufacturing a cathode ray tube according to claim 9, wherein the control is performed in a manner as described below. 12. The control unit temporarily stops discharge of the phosphor slurry from the coating liquid discharge unit when the coating liquid discharge unit passes above the outer peripheral wall of the front glass. The cathode ray tube manufacturing apparatus according to any one of claims 9 to 11, wherein the control is performed in the following manner.