JP2001126618A - Method and apparatus of manufacturing cathode ray tube and cathode ray tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method of manufacturing a cathode ray tube(CRT) with reduced weight that reduces the temperature of a process such as blackening process. SOLUTION: CRT 10 is manufactured by evacuating its inside 15 and outside 16 sealed. The vacuum sealing apparatus 11 includes means 12 and 14 for evacuating the frit part 8 of the CRT 10 from the outside. An amorphous frit glass is used to join the panel 1a and funnel 1b. The CRT 10 includes color selection electrodes blackened at a temperature of 350 deg.C or less.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for manufacturing a cathode ray tube and a cathode ray tube.

[0002]

2. Description of the Related Art A schematic sectional view of a color cathode ray tube is shown in FIG. In the color cathode ray tube 10, a phosphor screen (not shown) is provided in the panel portion 1a of the cathode ray tube body, and the color selection electrodes 3 are arranged so as to face the phosphor screen at a predetermined interval. .

The color selection electrode 3 is mainly composed of a color selection electrode thin plate 7 having a large number of tape-shaped grid elements 5 provided with slit-shaped electron beam passage holes 4 for selectively passing an electron beam. A frame 6 (6a, 6b) for supporting a color-selecting electrode thin plate 7; an electron beam R emitted from an electron gun 2 provided in a neck portion 1c of the cathode ray tube; Leads to the surface. Panel part 1a and funnel part 1 of cathode ray tube
Each of b is formed of, for example, glass, and these are connected at, for example, frit glass at a frit portion 8 serving as a sealing portion to form a cathode ray tube.
In the drawing, reference numeral 2a denotes a chip tube provided on the stem of the electron gun 2 for exhausting gas, and 9 denotes a conductive film such as a carbon film formed on the inner wall of the funnel portion 1b of the cathode ray tube.

The color cathode ray tube 10 as shown in FIG. 6 is manufactured through a predetermined process, and the process performed at a relatively high temperature is usually manufactured under the following temperature conditions. Have been. 1) Blackening process of the color selection electrode 3: about 450 ° C. 2) Frit sealing step: about 450 ° C. The frit sealing step also serves as burnout of organic substances on the phosphor screen. 3) Evacuation process: 300 ° C to 400 ° C

The above three steps are performed in the order of 1) to 3). In the exhaust process, the panel portion 1a and the funnel portion 1 are usually formed at the frit portion 8 by a frit seal material.
b is sealed, and the neck 1c and the electron gun 2 are sealed, so that the inside of the cathode ray tube is closed.

At this time, the cathode ray tube 10 is connected to the tip tube 2a.
In order to evacuate the inside, the panel portion 1a and the funnel portion 1b of the cathode ray tube 10 need to have strength and airtightness that can withstand a vacuum even at the maximum temperature (400 ° C. or lower) in the evacuation process. Therefore, the panel portion 1a and the funnel portion 1b are sealed using crystallized frit glass as a frit seal material. Further, as the crystallized frit glass, a material which is crystallized at 400 ° C. or higher by selecting its material composition is used.

The frit sealing process is performed at a temperature of about 450 ° C. using crystallized frit glass that crystallizes at 400 ° C. or higher as described above.

[0008]

By the way, the metal material used for the color selection electrode 3 is subjected to a strong tension, so that a creep (plastic deformation) occurs at 450 ° C. In particular, a streak (twist) occurs in the grid element body 5 of the thin and tensioned electrode plate 7 for color selection.

If the creep occurs in the frit sealing process, the color selection electrode 3 assembled and aligned with the panel portion 1a may be deformed, causing a so-called color shift in the completed cathode ray tube. is there. For this reason, in the blackening process of the color selection electrode 3, in order to prevent the frame 6 and the color selection electrode thin plate 7 of the color selection electrode 3 from creeping (plastically deforming) due to a temperature change in the frit sealing process that follows. In addition, it was necessary to perform a blackening process at a temperature higher than that of the frit sealing process to generate creep in advance.

[0010] Once blackening is performed at 450 ° C. or higher to generate creep, the amount of newly generated creep is relatively small even when the temperature is substantially the same in the frit sealing process. .

However, when the blackening process is performed under the temperature condition of 450 ° C. or more, the color-selecting electrode thin plate 7 fixed to the frame 6 is creeped by a certain tension. The tension drop occurs. For this reason, a decrease in the tension is anticipated before the blackening process, and a stronger tension is set in an initial state in which the color selection electrode thin plate 7 is stretched over the frame 6 of the color selection electrode 3.

Therefore, since a strong frame 6 is required to withstand a strong tension, the weight of the frame 6 increases accordingly, and it has been difficult to reduce the weight of the cathode ray tube 10.

In order to solve the above-mentioned problems, in the present invention, a method and a method for manufacturing a cathode ray tube capable of reducing the temperature of a step such as a blackening step and manufacturing a light-weight cathode ray tube. It is an object of the present invention to provide an apparatus and a cathode ray tube capable of reducing weight.

[0014]

According to the method of manufacturing a cathode ray tube of the present invention, the inside and outside of the cathode ray tube are evacuated and evacuated in the step of sealing the exhaust of the cathode ray tube.

According to the manufacturing method of the present invention described above, the pressure difference between the inside and outside of the cathode ray tube can be reduced by evacuating the inside of the cathode ray tube and the outside of the cathode ray tube in the exhaust sealing step. The load on the frit portion can be reduced.

In the cathode ray tube manufacturing apparatus according to the present invention, the exhaust sealing device for the cathode ray tube is provided with means for evacuating the frit portion of the cathode ray tube from the outside.

According to the configuration of the manufacturing apparatus of the present invention described above,
By providing the means for evacuating the frit portion from the outside, both the inside and the outside of the frit portion can be evacuated in the evacuation sealing step. Thereby, the pressure difference between the inside and outside of the frit portion can be reduced, and the load on the frit portion can be reduced.

The cathode ray tube of the present invention is formed by joining a panel and a funnel with amorphous frit glass.

According to the structure of the cathode ray tube of the present invention described above,
By joining the panel and the funnel with the amorphous frit glass, the amorphous frit glass has a property of sticking to the glass material of the panel and the funnel at a relatively low temperature, for example, 350 ° C. or less. A frit sealing process can be performed to join the panel and funnel.

The cathode ray tube of the present invention is provided with a color selection electrode blackened at 350 ° C. or lower.

According to the structure of the cathode ray tube of the present invention described above,
By providing the color selection electrode blackened at 350 ° C. or lower, the change in tension of the color selection electrode before and after the blackening process is small, so that the strength required for the color selection electrode can be reduced.

[0022]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention is a method for manufacturing a cathode ray tube in which the inside of the cathode ray tube and the outside of the cathode ray tube are evacuated in the step of sealing the cathode ray tube for exhaustion.

The present invention is an apparatus for manufacturing a cathode ray tube provided with a means for evacuating a frit portion of the cathode ray tube from the outside in the exhaust sealing device for the cathode ray tube.

The present invention is a cathode ray tube formed by joining a panel and a funnel with amorphous frit glass.

The present invention is a cathode ray tube including a color selection electrode blackened at 350 ° C. or lower.

First, an outline of the present invention will be described prior to describing specific embodiments of the present invention. The purpose of the above-described blackening process of the color selection electrode is summarized in the following three points. A. Rust prevention of color selection electrode (formation of blackened film) B. B. Anti-reflection of light in the phosphor screen exposure step Avoidance of color selection electrode change due to frit sealing process temperature

Of the three points described above, A and B can be expected to exert their effects by forming a blackened film. Therefore, it is not necessary to set the processing temperature to 450 ° C. or higher to obtain these effects. That is, the biggest factor that requires a processing temperature of 450 ° C. or higher is that it is necessary to achieve the object of avoiding the point C, that is, the change of the color selection electrode 3. When the color selection electrode 3 changes, a color shift occurs as described above.

Here, the change of the color selection electrode 3 will be described in more detail. In the color cathode ray tube 10, R
A color screen is displayed by mixing the three primary colors (red), G (green), and B (blue). By disposing the color selection electrode 3 in front of the phosphor screen, the electron beam is mechanically cut by the grid element 5 of the color selection electrode 3 and the electron beam passage hole 4 between the grid elements 5 is formed. The phosphor screen is irradiated with the passed electron beam, and R, G, B
Each phosphor is configured to be irradiated with an electron beam corresponding to each signal of R, G, and B.

Therefore, the phosphor screen of each color is formed by being aligned with the grid element body 5 of the color selection electrode 3. That is, after the carbon stripe, red phosphor, green phosphor, and blue phosphor of the phosphor screen are respectively applied to the entire inner surface of the panel, only the necessary portions are exposed by the grid element 5 of the color selection electrode 3, and unnecessary portions are exposed. The portions are removed to form a predetermined pattern of phosphor. That is,
It is manufactured by attaching or detaching the color selection electrode 3 for each color. According to this method, an inexpensive fluorescent screen with good performance can be obtained.

Then, the positional relationship between the phosphor screen obtained by the above-described method and the color selection electrode maintains the same relationship as when the phosphor screen was formed, even after the subsequent frit sealing step, evacuation step, and the like. Otherwise, the problem of color misregistration will occur. Therefore, before the fluorescent screen is formed, the color selection electrode 3 is previously subjected to blackening treatment to generate creep that occurs in a later step, and the fluorescent screen is formed using the color selection electrode 3 in that state. I have.

However, the temperature of the blackening process is as high as 450 ° C. or higher, and the material is severe, and the amount of change in the tension before and after the blackening process reaches as much as 30%. For this reason,
The color selection electrode 3 was manufactured in a state where the tension was increased by about 30% in advance, and it was necessary to increase the strength to maintain this high tension, and the frame 6 became thick and heavy. .

A factor that raises the temperature of the blackening process is the temperature condition of the frit sealing process. The temperature conditions in the frit sealing step are necessary to satisfy the conditions in the subsequent evacuation step.

The condition of the above-described evacuation step is to maintain strength against a pressure difference from the atmospheric pressure outside the cathode ray tube 10 while the inside of the cathode ray tube 10 is exhausted. Since the inside of the cathode ray tube 10 is evacuated, it is necessary to maintain strength against a pressure difference from the outside atmospheric pressure. That is, conventionally, in the evacuation process, the strength has to be equal to the strength required for the product of the cathode ray tube 10. In the evacuation step, for the purpose of suppressing generation of gas in the product as much as possible and satisfying a sufficient life characteristic, the air is heated sufficiently to 300 to 400 [deg.] C. as described above, so that sufficient evacuation is performed. If the evacuation step is performed at 200 ° C., sufficient life characteristics cannot be satisfied. Therefore, it is necessary that the frit sealing material of the frit portion 8 maintain its strength even when the temperature is high.

The crystalline frit glass is stabilized by crystallization, and when used as a frit seal material, it is fixed to the glass of the panel section 1a and the funnel section 1b by crystallization to have strength. Will be kept. If the crystallization temperature is low, for example, 350 ° C.
If a crystalline frit glass of a certain degree is used for the frit seal material, it will not be possible to maintain sufficient strength at 300 to 400 ° C. in the evacuation step.

Also, there is amorphous frit glass, and when this amorphous frit glass is used as a frit sealing material, it is fixed to the glass of the panel portion 1a and the funnel portion 1b to increase the strength. The working temperature of the frit sealing process is set so as to keep it. However, due to the properties of the amorphous frit glass, the working temperature becomes relatively low, and it becomes impossible to maintain sufficient strength at 300 to 400 ° C. in the evacuation process. In order to obtain sufficient strength with respect to the atmospheric pressure, the exhaust process must be performed at a temperature 100 ° C. to 150 ° C. lower than the working temperature of the frit sealing process, in which case the sufficient life characteristics of the cathode ray tube are satisfied. It is not possible.

From the above, conventionally, the above-mentioned working temperature (about 450 ° C.) was used by using crystallized frit glass having a crystallization temperature of about 450 ° C. as a frit sealing material.
Was performing the frit sealing process.

FIGS. 7 and 8 show the results of examining the change in tension before and after the blackening treatment at each treatment temperature in the blackening treatment step. The X axis is set in the horizontal direction, and the (initial) tension before blackening processing at each X coordinate (relative value) is indicated by a square with the position corresponding to the center of the screen of the color selection electrode 3 as the origin. The tension after the treatment is indicated by ●. 7A shows a case where the processing temperature is 300 ° C., FIG. 7B shows a case where the processing temperature is 350 ° C., FIG. 8C shows a case where the processing temperature is 400 ° C., and FIG. 8D shows a case where the processing temperature is 450 ° C. 7 and 8
As can be seen from the graph, as the processing temperature increases, the change in tension before and after the blackening process increases, and the amount of change in the tension increases as the distance from the center to the periphery of the screen increases.

From the results of FIGS. 7 and 8, the average value of the ratio of the tension after the blackening process to the initial tension before the blackening process was determined, and this was defined as the tension utilization ratio (%). FIG. 9 shows the relationship with the temperature. As shown in FIG.
It can be seen that the tension utilization rate is high at 0 ° C. or lower, and the tension utilization rate sharply decreases when the processing temperature exceeds 350 ° C.

Therefore, if the temperature of the blackening process is set to 350 ° C. or less, the change in tension can be reduced, and the initial tension setting can be made closer to the tension after blackening. This eliminates the need to form a strong frame 6 in anticipation of a change in tension in advance, so that the configuration of the frame 6 can be simplified and the weight of the color selection electrode 3 can be reduced.

In the present invention, the above-mentioned structure, that is, the frit portion of the cathode ray tube is evacuated from the outside to the cathode ray tube exhaust sealing device so that the temperature of the blackening process can be reduced to 350 ° C. or less. A cathode ray tube manufacturing apparatus provided with a means is employed, and the manufacturing apparatus is used to exhaust air by evacuating the inside of the cathode ray tube and the outside of the cathode ray tube in the exhaust sealing step.

Thus, in the exhaust sealing step (the exhaust step and the sealing step), both the inside and the outside of the frit portion 8 of the cathode ray tube 10 can be evacuated, so that the pressure difference between the inside and the outside is eliminated. Thus, the load on the frit portion 8 can be reduced. Therefore, it is possible to eliminate the necessity that the strength of the frit glass during the evacuation process is equal to the strength required for the product of the cathode ray tube 10.

As a result, regardless of the temperature in the exhaust process,
Since the frit portion 8 can be joined with non-crystallized frit glass or frit glass that crystallizes at a low temperature, the temperature of the frit sealing process can be reduced.
The blackening temperature of the color selection electrode 3 can be significantly reduced. For example, when amorphous frit glass having a working temperature of 300 ° C. is used, the temperature of the blackening process of the color selection electrode 3 is 3
00 ° C. + α.

By adopting the above-described structure, the temperature of the blackening process of the color selection electrode 3 can be lowered, and the following advantages are obtained. 1) The metal creep generated during the blackening treatment can be significantly reduced. Further, it is possible to avoid a twist (streak) of the grid element body 5 that occurs during the blackening process. 2) Since the change in the tension before and after the blackening treatment is greatly reduced, the tension when the initial electrode plate for color selection (color selection mask) 7 is set can be made smaller than the conventional excessive tension. The tension required in the completed cathode ray tube 10 can be approximated. Accordingly, the strength required for the frame 6 can also be reduced, so that the rigidity of the frame 6 can be reduced and the structure can be simplified, and the weight can be significantly reduced as compared with the conventional frame 6. For example, when the frit treatment is performed at 300 ° C., the weight can be reduced by about 30%. 3) Since the processing temperature of the blackening furnace or the frit furnace is lowered, the utility cost can be reduced. Since the burden on the furnace is also reduced,
The consumption cost of the manufacturing apparatus can also be reduced. 4) Since the time until the inside of the furnace is brought to the temperature of the blackening process can be shortened, the working efficiency can be improved. Among these advantages, the advantages of 3 and 4 can be obtained also in the frit sealing process by reducing the temperature in the frit sealing process.

Next, specific embodiments of the present invention will be described. FIG. 1 shows a schematic configuration diagram of a cathode ray tube manufacturing apparatus as one embodiment of the present invention. The cathode ray tube manufacturing apparatus 11 is used, for example, to manufacture the color cathode ray tube 10 shown in FIG.

The manufacturing apparatus 11 is provided with a first vacuum pump 13 as a means for evacuating the inside of the cathode ray tube 10 similar to the conventional manufacturing apparatus. The first vacuum pump 13 is connected to the tip tube 2a of the electron gun 2 sealed in the neck portion 1c of the cathode ray tube 10. Thereby, the inside 15 of the cathode ray tube 10 can be evacuated through the tip tube 2a.

In this embodiment, the neck 1
A processing chamber 12 is provided so as to cover the whole of the cathode ray tube 10 except for a part of c and maintain airtightness, and a second vacuum pump 14 is provided as a means for evacuating the outside of the cathode ray tube 10. Have been. And the second vacuum pump 1
4 is connected to the processing chamber 12, the processing chamber 1
The inside of the tube 2, that is, the outside 16 of the cathode ray tube 10 can be evacuated.

The outside 16 of the cathode ray tube 10 does not necessarily have to be in a high vacuum like the inside of the cathode ray tube 10.
The internal pressure of the cathode ray tube 10 is set to a sufficiently low pressure with respect to the atmospheric pressure.
It suffices if the pressure difference between 5 and the outside 16 can be reduced.

Further, as shown in FIG. 2, a working chamber provided with heating means, for example, a heating furnace 18 is provided so as to actually cover the outside of the cathode ray tube 10 and the processing chamber 12. Then, the inside of the heating furnace 18 is heated to raise the temperature to a predetermined work temperature required for the exhaust process.

The heating furnace 18 may also be used as a heating furnace used in other steps such as a frit sealing step. Further, although not shown, a configuration in which a processing chamber and a heating furnace are shared (for example, a configuration in which heating means such as a heater is provided inside or immediately outside the processing chamber) may be employed.

Next, a process for manufacturing a cathode ray tube using the manufacturing apparatus 11 of the present embodiment will be described. First, FIG.
Is subjected to blackening at a temperature of 350 ° C. or less as described above.

Next, an exposure step is performed by using the blackened color selection electrode 3 to form a phosphor screen having a predetermined pattern of phosphor layers on the inner surface of the panel section 1a. continue,
A metal back layer is formed on the phosphor screen via an intermediate film. The color selection electrode 3 is attached to the panel section 1a in which the phosphor screen and the metal back layer are formed on the inner surface as described above.

Then, as shown in FIG. 3A, the panel section 1 to which the color selection electrode 3 formed as described above is attached.
a and the funnel 1b are prepared. next,
As shown in FIG. 3B, the panel portion 1a and the funnel portion 1b are formed on the frit portion 8 by using an amorphous frit glass or a frit glass crystallized at 350 ° C. or lower (both are not shown) as a frit sealing material. After joining, a frit sealing process is performed at a predetermined temperature, for example, 350 ° C. At this time, the organic substance of the phosphor layer and the intermediate film on the inner surface of the panel section 1a is also burned out. After the frit sealing step is completed, the cathode ray tube 10 is once cooled gradually to return to room temperature.

Subsequently, as shown in FIG. 3C, the electron gun 2 is inserted into the neck portion 1c of the cathode ray tube which has been subjected to the frit sealing process, and the glass of the neck portion 1c and the stem of the electron gun 2 are joined. To seal the electron gun 2.

Next, as shown in FIG. 4D, the cathode ray tube 10 in which the electron gun 2 is sealed is assembled in the manufacturing apparatus 11 shown in FIG. In this case, a part of the neck portion 1c is
The tip tube 2 a of the stem of the electron gun 2 that is outside and is outside is connected to the first vacuum pump 13.
Then, the inside 15 of the cathode ray tube 10 is evacuated to a pressure of, for example, 0.1 mPa by the first vacuum pump 13. Further, the inside 16 of the processing chamber 12 is evacuated to a pressure of, for example, 1 Pa by the second vacuum pump 14.

As a result, the pressure difference between the inside 15 and the outside 16 of the cathode ray tube 10 becomes about 1 Pa,
It is significantly smaller than kPa. Therefore, the pressure applied to the frit glass of the frit portion 8 can be reduced.

In a state where the pressure difference between the inside 15 and the outside 16 of the cathode ray tube 10 is small, the entire inside of the cathode ray tube 10 and the processing chamber 12 is heated by a heating means such as a heating furnace 18.
The working temperature of a predetermined evacuation process is raised to, for example, 300 ° C. The evacuation of the outside 16 of the cathode ray tube 10 by the second vacuum pump 14 may be started from the room temperature as described above, or may be started during heating. However,
It is necessary to set the temperature at the start of evacuation so that the strength of the frit glass can be maintained.

When the temperature reaches the working temperature, the temperature is maintained, and the vacuum is continuously drawn.
Vent well. In this evacuation process, it is necessary to fix each of the panels and the funnel by abutting or the like so that the positions of the panel and the funnel during the normal frit sealing can be maintained. After a predetermined time has passed and exhaust has been sufficiently performed, the processing chamber 1
Decrease the temperature inside 2.

The temperature in the processing chamber 12 is set to a temperature at which the frit glass in the frit portion can withstand the atmospheric pressure, for example, 1.
When the temperature drops to about 50 ° C., as shown in FIG.
Stop the evacuation of the vacuum pump 14 to perform a leak,
The inside of the processing chamber 12, that is, the outside 16 of the cathode ray tube 10 is brought into the state of the atmospheric pressure Air. At this time, the inside 1 of the cathode ray tube 10
5 is a state where the evacuation by the first vacuum pump 13 is continued.

Next, after the cathode ray tube 10 is taken out of the processing chamber 12, the chip-off step is performed while the inside 15 of the cathode ray tube 10 is evacuated. Specifically, a heater is arranged around a predetermined position of the chip tube 2a to be sealed, and the glass of the chip tube 2a is melted by heating the heater. Since the inside 15 of the cathode ray tube 10 is in a vacuum, the molten glass is drawn into the inside, and the glass is adhered and sealed. Thereby, as shown in FIG. 4F, the cathode ray tube 10 in which the tip of the tip tube 2a is sealed and the inside 15 is evacuated is formed.

In this way, it is possible to manufacture the cathode ray tube 10 in which the inside 15 is sealed. At room temperature, the frit sealing material of the frit portion 8 joining the panel portion 1a and the funnel portion 1b has a sufficient strength and can function as the cathode ray tube 10.

According to the above-described embodiment, the cathode ray tube 1 is controlled by the first vacuum pump 13 and the second vacuum pump 14.
Since both the inside 15 and the outside 16 of the tube 0 can be evacuated, the pressure difference between the inside and outside of the cathode ray tube 10 can be reduced. In this way, the load on the frit seal material of the frit portion 8 can be reduced particularly in the evacuation process. Therefore, amorphous frit glass or frit glass that crystallizes at a low temperature of, for example, 350 ° C. or lower is used as the frit seal material. The frit sealing process can be performed at a low working temperature, for example, 350 ° C. or lower.

Since the temperature of the frit sealing step can be reduced, the temperature of the blackening step of the color selection electrode 3 which requires a temperature equal to or higher than that of the frit sealing step is also reduced to, for example, 350 ° C. or lower. be able to. By lowering the temperature of the blackening process, the change in tension before and after the blackening process is greatly reduced. It can be made much smaller than the tension, and the strength required for the frame 6 of the color selection electrode 3 can also be reduced.
Therefore, since the rigidity of the frame 6 can be reduced and the structure can be simplified, the weight of the color selection electrode can be reduced and the weight of the cathode ray tube can be reduced.

Further, since the temperatures of the blackening process and the frit sealing process are reduced, it is possible to reduce the cost of heating and heating due to the operation of the furnace and the replacement of the equipment and the cost of consuming the manufacturing equipment, and to reduce the time of the temperature cycle. The working efficiency can be improved by shortening.

Next, another embodiment of the present invention will be described. In the present embodiment, a means for evacuating the outside of the cathode ray tube 10 is provided only near the frit portion 8. FIG. 5 shows a schematic configuration diagram of a cathode ray tube manufacturing apparatus according to another embodiment of the present invention. In this manufacturing apparatus 21,
The processing chamber 22 covers the vicinity of the frit portion 8 of the cathode ray tube 10, that is, a part of the funnel portion 1b and the panel portion 1a. The inside 23 of the processing chamber 22 is connected to the second vacuum pump 14 similar to that of FIG. Other configurations are the same as those of the manufacturing apparatus 11 according to the above-described embodiment, and thus the same reference numerals are given and the repeated description is omitted.

According to the present embodiment, since the processing chamber 22 is provided only near the frit portion 8, the volume of the inside 23 is reduced. Thereby, the second vacuum pump 14
, And the space for maintaining the vacuum becomes small, so that the structure of the processing chamber 22 can be simplified.

The present invention is not limited to the above-described embodiment, but may take various other configurations without departing from the gist of the present invention.

[0067]

According to the present invention described above, the pressure difference between the inside and outside of the cathode ray tube can be reduced in the exhaust sealing step, so that the load on the frit portion for joining the panel and the funnel can be reduced. . Thus, the frit sealing process can be performed at a low operating temperature using amorphous frit glass or frit glass that crystallizes at a low temperature as the frit sealing material.

Further, since the temperature of the frit sealing step can be lowered, the temperature of the blackening step of the color selection electrode can also be lowered. As a result, the change in tension before and after the blackening treatment is greatly reduced, so that the initial tension can be significantly reduced from the conventional excessive tension, and the strength required for the color selection electrode frame can also be reduced. Can be. Therefore, the rigidity of the frame can be reduced and the structure can be simplified, so that the weight of the color selection electrode can be reduced and the weight of the cathode ray tube can be reduced.

Further, it is possible to manufacture the cathode ray tube while reducing the heating expenses and the consumption cost of the manufacturing apparatus and improving the working efficiency.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a cathode ray tube manufacturing apparatus according to an embodiment of the present invention.

FIG. 2 is a diagram showing a configuration in which a furnace is provided outside the manufacturing apparatus of FIG.

3A to 3C are process diagrams showing a method for manufacturing a cathode ray tube using the manufacturing apparatus of FIG.

4A to 4F are process diagrams showing a method for manufacturing a cathode ray tube using the manufacturing apparatus of FIG.

FIG. 5 is a schematic configuration diagram of an apparatus for manufacturing a cathode ray tube according to another embodiment of the present invention.

FIG. 6 is a schematic sectional view of a color cathode ray tube.

FIGS. 7A and 7B are diagrams showing changes in tension before and after blackening processing at respective processing temperatures in blackening processing steps.

FIG. 8 is a diagram showing a change in tension before and after the blackening process at each processing temperature in the C and D blackening processes.

FIG. 9 is a diagram showing the relationship between the temperature of the blackening process and the utilization rate of tension.

[Explanation of symbols]

1a panel section, 1b funnel section, 1c neck section, 2 electron gun, 2a chip tube, 3 color selection electrode, 6
Frame, electrode plate for 7 color selection, 8 frit part,
10 cathode ray tube, 11, 21 cathode ray tube manufacturing apparatus, 1
2, 22 processing chamber, 13 first pump, 14 second pump, 18 heating furnace

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Masanaga Tanaka 6-7-35 Kita Shinagawa, Shinagawa-ku, Tokyo Inside Sony Corporation (72) Inventor Yuko Nakano 6-35, Kita-Shinagawa, Shinagawa-ku, Tokyo No. Sony Corporation F term (reference) 5C012 BB02 PP01 PP08 5C031 EE06 EH08

Claims (4)

[Claims] 1. A method of manufacturing a cathode ray tube, comprising: evacuating the inside of the cathode ray tube and the outside of the cathode ray tube in the step of exhausting and sealing the cathode ray tube. 2. An apparatus for manufacturing a cathode ray tube, wherein the exhaust sealing device for the cathode ray tube is provided with a means for evacuating a frit portion of the cathode ray tube from the outside. 3. A cathode ray tube comprising a panel and a funnel joined with amorphous frit glass. 4. A cathode ray tube comprising a color selection electrode blackened at 350 ° C. or lower.