JP2001185033A - Method of manufacturing cathode and method of cleaning the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide method of manufacturing a cathode ray tube, that enables to remove foreign substances such as phosphor films adhered to inner and outer surfaces and a seal surface of walls without lowering of the production efficiency in a glass panel having phosphor films. SOLUTION: A phosphor coating liquid is applied to an inner surface of the glass panel 13 having walls 12a to form phosphor films 16a, 16b, 16c, and then the inner surface of the glass panel 13 is directed downwardly and the walls 12a of the glass panel 13 is immerged into a cleaning solution 35 contained in a cleaning bath 32 to clean the walls 12a, the cleaning solution 35 is injected from a first nozzle 36 which is directed to outer surface of the walls 12a from outside of the walls 12a in a supply part, while the cleaning solution 35 within the cleaning bath 32 is discharged from a discharge port 34 which is disposed at a bottom surface 32a of the cleaning bath to opposite to the inner surface of the panel 13.

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 used for a television receiver, a computer display, and the like, and a cleaning apparatus therefor.

[0002]

2. Description of the Related Art A screen film forming process in a general method of manufacturing a cathode ray tube includes a step of forming a phosphor film on an inner surface of a glass panel having a wall portion (hereinafter referred to as a "panel"), and a step of forming the phosphor film. Forming a filming film by applying a filming liquid thereon, washing and removing unnecessary phosphor film and filming film adhered to the end face of the wall portion of the panel with a cleaning solution, and Forming a metal film of aluminum (hereinafter, referred to as “Al”) by vacuum deposition on the metal film,
Heating to a temperature at which organic matter is decomposed to remove the filming film.

[0003] Further, for example, the cleaning apparatus in the cleaning and removing step disclosed in Japanese Patent Application Laid-Open No. H10-69855, as shown in FIG.
A tank 4 is provided below the panel 1 transferred by the carrier 2 and stores a cleaning solution 3 of acetone, and a mesh plate member 5 provided inside the tank 4. The mesh plate member 5 is elastically urged upward by an elastic member 6 provided between the lower surface of the tank 4 and the mesh plate member 5, and is moved upward by a stopper 8 provided on the inner wall 4 a of the tank 4. Is restricted. The tank 4 is moved up and down by the lifting means 7. And
With this cleaning device, unnecessary phosphor films 9 and filming films (not shown) adhered to the inner and outer surfaces and the sealing surface at the end of the panel wall 1 a are dissolved and removed by the cleaning liquid 3, and the panel 1 is removed by the carrier 2. It is cleaned by being rotated and scraped off by the mesh plate member 5.

[0004]

However, in the above-described cleaning apparatus, as the number of times of panel cleaning increases, the phosphor film 9 and the filming film removed from the panel wall 1a fill the mesh holes of the mesh plate member 5. Clog. As a result, the cleaning performance of the unnecessary phosphor film 9 and the filming film particularly attached to the sealing surface of the panel wall 1a is reduced, and frequent cleaning of the mesh plate member 5 is required.
However, there was a problem that productivity of the product decreased.

When the cleaning of the sealing surface and the like of the panel wall 1a is completed, the mesh plate member 5 is locked by the stopper 8, but a liquid pool is generated on the mesh plate member 5 due to the surface tension of the cleaning liquid 3. Next, when the panel 1 to be cleaned is brought into contact with the mesh plate member 5, the liquid pool is caught between the mesh plate member 5 and the sealing surface of the panel wall 1a, scatters in the direction of arrow C and adheres to the panel inner surface 1b. As a result, the phosphor film 9 formed on the inner surface 1b of the panel is peeled off, resulting in uneven film thickness, and the cathode ray tube using the panel 1 has a problem of uneven brightness.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and an unnecessary portion attached to the inner and outer surfaces of the wall portion and the sealing surface without lowering the productivity of the glass panel having the phosphor film. Provided are a method and an apparatus for manufacturing a cathode ray tube for removing a foreign substance such as a phosphor film.

[0007]

According to the method of manufacturing a cathode ray tube of the present invention, a phosphor coating solution is applied to the inner surface of a glass panel having a wall portion to form a phosphor film, and then the inner surface of the glass panel is removed. A method for manufacturing a cathode ray tube for downwardly immersing a wall portion of the glass panel in a cleaning solution in a cleaning tank, and cleaning the wall portion, wherein the wall portion is formed on an outer surface of the wall portion from outside the wall portion. The cleaning liquid in the cleaning tank is discharged from a discharge unit disposed on the bottom of the cleaning tank facing the inner surface of the glass panel while spraying the cleaning liquid from the supply unit.

According to this method, the unnecessary phosphor film attached to the inner and outer surfaces of the wall portion and the sealing surface can be always removed by the cleaning liquid.

According to the present invention, there is provided a cathode ray tube manufacturing apparatus for supporting a cleaning tank containing a cleaning liquid, a glass panel having a wall, and immersing the cleaning panel in the cleaning liquid with the sealing surface of the wall facing downward. Carrier, on the bottom of the cleaning tank facing the inner surface of the glass panel, a discharge unit for discharging the cleaning liquid in the cleaning tank, and on the outer wall of the cleaning tank, the cleaning liquid toward the outer surface of the wall. And a supply unit for supplying.

With this configuration, the cleaning liquid is discharged from the discharge section while the cleaning liquid is jetted toward the outer surface of the wall section by the supply section, and unnecessary foreign substances adhering to the inner and outer surfaces of the wall section and the sealing surface are always removed by the cleaning liquid. can do.

[0011]

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

A method for manufacturing a cathode ray tube according to the first embodiment of the present invention will be described below.

As shown in FIG. 3 and FIG. 4, the black matrix film forming step 11 allows the black matrix to be formed on the inner surface 13 of the glass panel 12 (hereinafter referred to as "panel 12") in a portion other than a predetermined portion where pixels are formed. The film 14 is formed.

Next, in a coating step 15, a phosphor coating liquid of a mixed liquid of green phosphor particles of the first color, PVA and ammonium bichromate is applied to the inner surface 13 of the panel on which the black matrix film 14 is formed. Then, it is dried in a drying step 17. Subsequently, exposure is performed through a shadow mask in an exposure step 18, development processing is performed in a development step 19, and the first
A green phosphor film 16a is formed.

Next, the coating step 15 and the drying step 1
7. The exposure step 18 and the development step 19 are repeated to form a blue phosphor film 16b of the second color at a predetermined location, and then the same steps, namely, the coating step 15 and the drying step 1
7. The exposure step 18 and the development step 19 are repeated to form a third color red phosphor film 16c at a predetermined location.

Next, a filming liquid is formed on the panel inner surface 13 on which the green, blue and red color phosphor films 16a, 16b and 16c are formed by the coating step 15 and the like by the coating step 20a of the filming film forming step 20. The unnecessary phosphor films 16a, 16a adhered to the end surface of the wall portion of the panel 12 using a mixed solution containing acetone (hereinafter, referred to as "cleaning solution") in a cleaning step 20b described below.
b, 16c and the filming liquid are removed. Subsequently, the applied filming liquid is dried in a drying step 20c to form a filming film 21 (an intermediate film for forming the metal film 23). The filming liquid is an acrylic emulsion, 0.01 to 0.1 wt%.
Containing a linear surfactant having a polycarboxylic acid, pure water, hydrogen peroxide and the like.

Next, in a metal film forming step 22, a metal film 23 made of aluminum (Al) is formed on the filming film 21 on the panel inner surface 13 by vacuum evaporation.

Next, in a panel baking step 24,
The temperature of the panel 12 after forming the metal film 23 is 400
The filming film 21 which is an organic material is decomposed and removed by heating in a heating furnace of ~ 450 ° C.

Through the above steps, the panel inner surface 13
On the top, a black matrix film 14, a phosphor film 16a,
A screen film in which 16b, 16c and the metal film 23 are sequentially formed is manufactured. The subsequent steps, such as a sealing step and an exhausting step, are the same as the conventional method of manufacturing a cathode ray tube, and a description thereof will be omitted.

Next, a specific example of the cleaning step 22b will be described.

First, the cleaning apparatus of the present invention used in the cleaning step 22b will be described.

As shown in FIGS. 1 and 2, the apparatus for manufacturing a cathode ray tube according to the present invention has a cleaning tank 3 containing a cleaning liquid 35.
2 and a carrier 31 for supporting the panel 12 having the wall portion 12a.

The carrier 31 supports the side surface of the panel 12 and is immersed in the cleaning liquid 35 of the cleaning tank 32 with the sealing surface 13a of the wall portion 12a facing downward. Holder 3 centered on
And a driving unit 31b that rotates the motor 1a.

The cleaning tank 32 is provided with a discharge part 34 for discharging a cleaning liquid 35 at the center of the cleaning tank bottom surface 32a facing the panel inner surface 13. The discharge part 34 is a circular cylindrical tube 34a, and the cleaning liquid 35 is discharged from the cleaning tank bottom surface 32a.
The height H1 of the outer wall 32b of the washing tank 32
Is lower than the height H2. The protruding outer peripheral surface 34b of the cylindrical tube 34a has a tapered shape in which the outer diameter D1 on the protruding side is smaller than the outer diameter D2 on the cleaning tank bottom surface 32a side.

A plurality of first nozzles 36, which are supply units for spraying a clean cleaning liquid 35 toward the outer surface 13b of the wall portion 12a, are provided on the outer wall 32b of the cleaning tank 32,
Seal surface 13a of wall portion 12a and washing tank bottom surface 32a
And a plurality of second nozzles 37 that spray a clean cleaning liquid 35 at a rate of about 0.5 m / s or more, and at least one of the first nozzle 36 and the second nozzle 37.
And a deflecting plate 38 for deflecting the flowing direction of the light. Further, the first nozzle 36 and the second nozzle 37 are provided with the cleaning liquid 35 ejected from the first nozzle 36 and the second nozzle 37.
Accordingly, the cleaning liquid 35 in the cleaning tank 32 is arranged to rotate along the inner wall surface of the cleaning tank 32.

Further, in order to improve the cleaning performance, a plurality of ultrasonic vibration elements 46 are provided on the bottom surface 32a of the cleaning tank at a position facing the sealing surface 13a of the wall portion 12a.

Further, an eyelet-shaped shielding member 39 is provided in a space between the panel inner surface 13 and the discharge portion 34. The shielding member 39 includes a flange 39a for preventing the cleaning liquid 35 in the cleaning tank 32 from scattering and a cylindrical portion 39b inserted into the inner diameter of the cylindrical tube 34a.

In the cleaning step 20b using the above-described cleaning apparatus, after the coating step 20a, as shown in FIGS. 1 and 2, the inner surface 13 of the panel on which the phosphor films 16a, 16b, 16c and the filming film 21 are formed is formed. Facing down,
In addition, the sealing surface 13a of the wall portion 12a is immersed in the cleaning solution 35 in the cleaning tank 33, and the clean cleaning solution 35 is sprayed from the outside of the wall portion 12a toward the outer surface 13b of the wall portion 12a from the first nozzle 36 serving as a supply portion. At the same time, the cleaning liquid 35 in the cleaning tank 33 is discharged from the discharge unit 34 disposed on the cleaning tank bottom surface 32a facing the panel inner surface 13. Thereby, unnecessary phosphor films 16a attached to the inner and outer surfaces 13c, 13b of the wall portion 12a and the sealing surface 13a,
16b, 16c and the filming film 21 are removed by washing. At this time, the unnecessary phosphor films 16a, 16b, 16c attached to the seal surface 26 and the like and the filming are formed by rotating the panel 12 by the driving unit 31b or vibrating the plurality of ultrasonic vibration elements 46. Membrane 21
Is efficiently washed away.

Next, after the wall portion 12a of the panel 12 is drawn out of the cleaning liquid 35 by the carrier 31, the process moves to the drying step 20c.

Next, the operation and effect of the method and apparatus for manufacturing a cathode ray tube according to the present invention will be described.

In the method and apparatus for manufacturing a cathode ray tube according to the present invention, the cleaning liquid 35 is discharged from the discharge part 34 while spraying the cleaning liquid 35 toward the outer surface 12c of the wall part 12a by the first nozzle 36 as the supply part. is there. By this operation, unnecessary phosphor films 16a, 16a adhered to the inner and outer surfaces 13c, 13b of the wall portion 12a and the sealing surface 13a.
Foreign substances such as b, 16c and the filming film 21 can be washed and removed with the washing liquid 35 at all times. Further, since the cleaning liquid 35 jetted from the first nozzle 36 as the supply unit is always a substantially clean cleaning liquid 35,
Unnecessary foreign substances adhered to the inner and outer surfaces 13a and 13b of the wall portion 12a and the sealing surface 12b can be stably washed and removed. Therefore, maintenance such as cleaning is not required since the conventional mesh plate member is not used, and the productivity of the panel can be improved.

Since the cylindrical tube 34a, which is the discharge portion 34, projects from the cleaning tank bottom surface 32a to the cleaning liquid surface 35a side, the cleaning liquid surface 35a becomes the same as the uppermost projecting surface of the cylindrical tube 34a, and the cleaning liquid surface 35a. The phosphor film 16a floating above,
Foreign matter such as 16b, 16c and the filming film 21 is discharged from the protruding portion of the cylindrical tube 34a. as a result,
The cleaning liquid 35 in the cleaning tank 32 is kept clean, and unnecessary foreign substances adhering to the inner and outer surfaces 13c and 13b of the wall portion 12a and the sealing surface 13a can be stably washed and removed.

The outer peripheral surface 34 of the cylindrical tube 34a protrudes.
b is a taper shape in which the outer diameter D1 on the protruding side is smaller than the outer diameter D2 on the cleaning tank bottom surface 32a side, so that the phosphor films 16a, 16b, 16 accumulated on the cleaning tank bottom surface 32a.
Foreign substances such as c and the filming film 21 are discharged from the uppermost projecting surface of the cylindrical tube 34a after going up the tapered inclined surface. As a result, the cleaning liquid 35 in the cleaning tank 32 is kept clean, and unnecessary foreign substances adhering to the inner and outer surfaces 13c and 13b of the wall portion 12a and the sealing surface 13a can be stably washed and removed. Furthermore, by providing the second nozzle 37 for spraying the clean cleaning liquid 35 between the sealing surface 13a of the wall portion 12a and the cleaning tank bottom surface 32a,
The foreign matter remaining on the cleaning tank bottom surface 32a is easily discharged together with the cleaning liquid 35 from the projecting uppermost surface of the cylindrical tube 34a along the tapered inclined surface. As a result, foreign matters that accumulate on the ultrasonic vibration element 46 can be reduced. By vibrating the cleaning liquid 35 with the ultrasonic vibration element 46, the wall portion 12a
Unnecessary foreign substances adhering to the inner and outer surfaces 13c and 13b and the sealing surface 13a can be stably washed and removed.

Further, by providing a shielding member 39 for preventing the splash of the cleaning liquid 35 in the cleaning tank 32 in the space between the panel inner surface 13a and the discharge section 34, the wall section 12a of the panel 12 can be cleaned by the cleaning tank 32. It is possible to reduce the scattering of the cleaning liquid 35 to the panel inner surface 13 which occurs when the liquid is immersed in the cleaning liquid 35 therein and when the liquid is discharged from the cleaning tank 32 to the cylindrical tube 34a which is the discharge part 34.

Further, by rotating the panel 12 by the driving section 31b, the inner and outer surfaces 13c of the wall section 12a,
Unnecessary foreign substances adhering to the seal 13b and the sealing surface 13a can be stably washed and removed with the washing liquid 35.

The first nozzle 36, which is a supply unit, is disposed so that the cleaning liquid 35 in the cleaning tank 32 rotates along the inner wall surface 32c of the cleaning tank 32. Unnecessary foreign substances adhering to the seal 13b and the sealing surface 12b can be more stably washed and removed.

In the first embodiment, the description has been given of the case where the cleaning step 20b is provided after the coating step 20a. However, the present invention is not limited to this, and the cleaning step 20b may be replaced with the developing step 19 shown in FIG. The unnecessary phosphor films 16a, 16b, and 16c attached to the inner and outer surfaces 13c and 13b of the wall portion 12a and the sealing surface 13a may be washed and removed by the washing process 20b provided between the filming film forming process. .

In the above embodiment, the rotation of the panel 12 and the rotation of the cleaning liquid 35 in the cleaning tank 32 have been described. However, the present invention is not limited thereto. Unnecessary phosphor films 16a, 1a attached to the inner and outer surfaces 13c, 13b of the wall portion 12a and the sealing surface 13a in either one by rotation.
6b and 16c can be removed by washing.

For example, when only the cleaning liquid 35 in the cleaning tank 32 is rotated, it is not necessary to rotate the panel 12 by the driving unit 31b, and the configuration of the carrier 31 can be simplified. Further, since the outer shape of the flange 39a of the shielding member 39 provided in the space between the panel inner surface 13a and the discharge portion 34 can be made substantially the same as the inner surface shape of the panel 12, the cleaning liquid 35 in the cleaning tank 32 Can be further reduced.

The cleaning liquid 35 may be pure water or an aqueous sodium hydroxide solution in addition to the mixed liquid containing acetone, and pure water is preferable from the viewpoint of environmental protection.

[0041]

As described above, the method and apparatus for manufacturing a cathode ray tube according to the present invention can reduce unnecessary phosphor films and the like adhering to the inner and outer surfaces of the wall portion and the sealing surface with a substantially clean cleaning solution. Foreign matter can be removed. Also,
Since the conventional mesh plate member is not used, maintenance such as cleaning is not required, and the productivity of the panel can be improved.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a cleaning apparatus using a method for manufacturing a cathode ray tube according to a first embodiment of the present invention.

FIG. 2 is a plan view of a cleaning apparatus using the same manufacturing method.

FIG. 3 is a block diagram showing the manufacturing method.

FIG. 4 is a sectional view showing a screen film formed on the inner surface of the panel by using the same manufacturing method.

FIG. 5 is a diagram showing a conventional apparatus for cleaning a panel for a cathode ray tube.

[Explanation of symbols]

 12 Glass Panel 12a Wall 13 Glass Panel Inner Surface 16a, 16b, 16c Phosphor Film 32 Cleaning Tank 32a Cleaning Tank Bottom 35 Cleaning Liquid

Claims (7)

[Claims] After coating a phosphor coating solution on the inner surface of a glass panel having a wall portion to form a phosphor film, the inner surface of the glass panel faces downward and the wall portion of the glass panel is cleaned. A method for manufacturing a cathode ray tube, wherein the glass panel is immersed in a cleaning solution in a tank and cleans the wall portion, wherein the glass panel is sprayed from a supply portion toward an outer surface of the wall portion from outside the wall portion. A method of manufacturing a cathode ray tube, comprising: discharging a cleaning liquid in the cleaning tank from a discharge unit disposed on a bottom surface of the cleaning tank facing an inner surface. 2. The method for manufacturing a cathode ray tube according to claim 1, wherein the discharge portion is a cylindrical tube protruding from the bottom surface of the cleaning tank toward the cleaning liquid surface. 3. The cathode ray according to claim 2, wherein the projecting outer peripheral surface of the cylindrical tube has a tapered shape in which the outer diameter of the projecting side is smaller than the outer diameter of the washing tank bottom side. Pipe manufacturing method. 4. The cleaning liquid sprayed from the supply section is a substantially clean cleaning liquid.
The method for producing a cathode ray tube according to any one of the above. 5. The method for manufacturing a cathode ray tube according to claim 1, wherein the supply unit is arranged so that a cleaning liquid in the cleaning tank rotates along an inner wall surface of the cleaning tank. 6. The cathode ray tube according to claim 1, further comprising a shielding member provided in a space between the inner surface of the glass panel and the discharge portion to prevent a splash of a cleaning liquid in the cleaning tank. Manufacturing method. 7. A cleaning tank in which a cleaning liquid is stored, a carrier for supporting a glass panel having a wall, and immersing the cleaning liquid in the cleaning liquid with the sealing surface of the wall facing downward. A discharge unit for discharging the cleaning liquid in the cleaning tank on the bottom of the cleaning tank facing the inner surface, and a supply unit for supplying the cleaning liquid toward the outer surface of the wall unit on the outer wall of the cleaning tank. Cleaning equipment for cathode ray tubes provided.