JPH0766740B2 - Color cathode ray tube manufacturing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a method for manufacturing a color cathode ray tube.

(Prior Art) Conventionally, as shown in FIG.
A shadow mask 1 and a frame 2 for reinforcing the shadow mask 1 are welded and fixed by a holder 3 from an outer side surface of the frame, and the holder 3 is fixed to a pin 6 provided on an inner side surface of a panel 5 on which a phosphor pattern 4 is formed. After mounting, this panel 5
It is assembled by welding glass to the funnel 7.

As a method of forming the phosphor pattern 4 of the panel 5,
As shown in FIG. 7, after incorporating the shadow mask 1 into the panel 5 having the inner surface uniformly coated with the phosphor, the exposure device 8 irradiates the phosphor with exposure light from the small holes 1a of the shadow mask 1. The method of exposing to light is used.

The exposure table 9 of the exposure device 8 has a light source 10, a plurality of lenses 11 and a filter 12 built-in, and the outer surface of the panel 5 is positioned and fixed by a stopper 13 attached to the upper surface of the exposure table 9. Exposure. After the exposure, the panel 5 is removed from the exposure device 8, and the shadow mask 1, the frame 2 and the like incorporated in the panel 5 are removed from the panel 5 and developed. In this development, the inner surface of the panel is washed with pure water to wash away the fluorescent material in the unexposed area,
This is followed by drying.

After developing in this way, a phosphor that emits a different color is applied to the entire inner surface of the panel, the same shadow mask 1 as that used in the above-mentioned step is mounted in the panel 5, and exposed by the exposure device 8. The relative positions of the light source 10, the lens 11 and the filter 12 of the exposure device 8 used at this time with respect to the panel 5 have a different positional relationship from that of the exposure table 9 used in the above-mentioned process, which makes it different from the previous process. It is possible to expose the phosphor in the exposed portion to light.

In this way, a series of phosphor coating, exposure, and development steps are repeated three times to form three different phosphor patterns, and finally the shadow mask 1 is mounted in the panel 5. The panel 5 and the funnel 7 are glass-welded.

In this way, a pattern consisting of three types of phosphors is formed,
To weld the panel 5 and the funnel 7 to glass,
It is necessary to combine and separate the panel 5 and the shadow mask 7 once for each exposure (three times with three kinds of phosphors in total) and once after the final phosphor development, and the panel 5 is additionally required. After the exposure of the shadow mask 1 is performed once, it is necessary to pass through the entire process with the combination of the panel 5 and the shadow mask 1 being the same.

Therefore, an operator is required to combine and separate the shadow masks, and further, the two conveyances must be carried out in synchronism with each other so that the combined state of the shadow masks does not shift during the whole process.

(Problems to be Solved by the Invention) As described above, in the conventional method for manufacturing a color cathode-ray tube, since it is necessary to convey the panel and the shadow mask at all times in synchronization, the conveying equipment is complicated and the equipment area of the assembling equipment is large. However, there is a problem that space saving is hindered and capital investment is increased. Further, there is a problem that the work becomes complicated because the work of attaching and detaching the panel and the mask is required for each exposure.

The present invention has been made to solve the above-mentioned conventional problems. In the process of forming a phosphor pattern of a color cathode ray tube, a master shadow mask is used, and when the glass is welded to the panel and the funnel, the original shadow is eliminated. By adopting the method of aligning the mask and the panel, it is possible to eliminate the need for synchronous transport of the shadow mask when forming the phosphor pattern, and also to eliminate the attachment and detachment of the panel and the shadow mask during exposure. The pattern formation process can be greatly simplified, and the use of plate glass in the panel can significantly reduce the cost of the panel and provides a high quality image compared to a panel with a conventional curvature. It is an object of the present invention to provide a method for producing a color CRT capable of obtaining the above.

[Structure of the Invention] (Means for Solving the Problems) In the method for manufacturing a color cathode ray tube of the present invention, a shadow mask is provided in a funnel, and a phosphor pattern is formed on the inner surface of the funnel using an exposure device. In a method of manufacturing a color cathode ray tube configured by hermetically sealing a plate-shaped panel, a step of performing exposure by a master shadow mask provided in advance in the exposure device to form a predetermined phosphor pattern on the inner surface of the plate-shaped panel And a step of performing relative alignment with respect to the funnel and the shadow mask, hermetically sealing and assembling them.

(Operation) In the present invention, a plate glass is used as a panel,
At the time of forming the phosphor pattern, by performing exposure using the shadow mask of the master provided in advance in the exposure device, it is possible to eliminate the work of attaching and detaching the panel and the shadow mask,
In addition, it is possible to eliminate the need for the synchronous transfer of the panel and the shadow mask, which is conventionally required.

(Example) Hereinafter, one example of the present invention will be described with reference to the drawings.

FIG. 1 is a view showing the structure of a color cathode ray tube according to this embodiment, and FIG. 2 is an assembly exploded view for explaining the internal structure of FIG.

The panel 21 is made of a flat plate member, for example, plate glass, and a phosphor pattern 22 is formed on one surface thereof.

The panel 21 is hermetically fixed to the opening of the funnel 23 by glass sealing. In the opening of the funnel 23, a shadow mask 24 is arranged and held by a frame 25 and a holder 26.
The pin is positioned and fixed to the funnel 23 by a pin 27 provided on the inner surface of the opening of the funnel 23.

As described above, since the shadow mask 24 is attached to the funnel 23 side, the relative position between the shadow mask 24 and the phosphor pattern 22 formed on the panel 21 changes the relative position between the panel 1 and the funnel 7. By doing so, it is possible to arbitrarily change and adjust.

FIG. 3 is a view showing an example of the exposure device 31, in which the panel 21 having one surface entirely coated with the phosphor is supported on the exposure table 32 by the spacers 33 suspended from the periphery of the upper opening of the exposure table 32. Exposure table 32 so that it abuts on the side surface of panel 21.
The side surface of the stopper 34 is positioned by the stopper 34 provided above.

The master shadow mask 35 is attached to the lower surface of the opening of the exposure table 32, and the exposure of the phosphor surface of the panel 21 is performed by exposing a large number of exposure light from the light source 36 inside the exposure table 32 to the master shadow mask 35. Panel 21 through the small hole 35a provided
It is performed by irradiating the phosphor of.

By using such an assembling method, it is not necessary to combine the shadow mask 24 and the panel 21 when exposing the phosphor.

By the way, in the exposure apparatus 31 of the above embodiment, the lens 11 provided in the conventional exposure apparatus 8 shown in FIG.
And the filter 12 is not provided. This is because the position and size of the small hole 35a provided in the master shadow mask 35 is set to be different from the original shadow mask, so that the original shadow mask is used through the lens and the filter. This is because the same conditions as those in the case of exposing by exposure are created, and if the master shadow mask 35 has the same shape and small holes as the original shadow mask, a lens and a filter are used.

By using the plate-shaped panel 21 as described above and the exposure device 31 having the master shadow mask 35 built therein, the shadow mask is used in the step of forming the phosphor pattern.
It is possible to form a predetermined phosphor pattern on the panel surface without performing the synchronous transfer of 24 and the panel 21 and the attachment / detachment work at the time of exposure. However, as the exposure apparatus that exposes the three types of phosphors, it is the same as the conventional method that three exposure apparatuses set in each exposure apparatus are installed and the exposure is performed three times.

After the phosphor pattern 22 is formed on the panel 21 in this manner, the relative position between the shadow mask 24 mounted in the funnel 23 and the phosphor pattern 22 on the panel is detected by, for example, a camera, and the positions are matched. As described above, the position of the panel 21 with respect to the funnel 23 is adjusted, and airtight sealing is performed by glass welding, thereby forming a predetermined color CRT.

FIG. 4 is a view showing a method of performing relative alignment between the panel on which the above-mentioned phosphor pattern is formed and the shadow mask. The alignment between the panel 21 and the shadow mask 24 is as follows.
This is performed when the funnel 24 equipped with these is glass-welded.

In FIG. 4, the funnel 23 is mounted on the sealing frame 41, and is positioned by a neck stopper 42 that abuts in the vicinity of the constricted portion of the funnel and a pad stopper 43 that abuts the outer surface of the funnel opening. The pad stopper 43 is screwed to the panel stopper 44, and is structured to be able to move forward and backward in the direction orthogonal to the funnel by this screw mechanism.

On the other hand, a shadow mask position detection mechanism 45 is arranged above the funnel 23, and a floating mechanism 46 slidable in a direction orthogonal to the funnel is mounted on the shadow mask position detection mechanism 45.

A reference plate 47 having a T-shaped cross section is hung on the lower surface of the center of the floating mechanism 46.
One end of a is brought into contact with the panel stopper 44 and positioned.

Further, cameras 48 are provided on the lower surface plate 47a of the reference plate 47 at symmetrical positions with respect to the support shaft 47b of the reference plate. These two cameras 48 are always positioned at predetermined positions.

In this state, the two cameras 48 detect the relative positional deviation amount of the shadow mask 24 with respect to the camera 48, and the pad stopper 43 is adjusted based on the detected positional deviation amount, whereby the position of the funnel 23, that is, the shadow. mask
Set the position of 24 with respect to the panel stopper 44 to the reference value.

After that, as shown in FIG. 5, the panel 21 is brought into contact with the panel stopper 44, placed on the funnel 23, housed in a furnace or the like, and the panel 21 and the funnel 23 are hermetically sealed by glass welding. The relative position between the small hole 24a of the shadow mask 24 and the phosphor pattern 22 of the panel 21 can be made to match the specified value.

Other methods may be used for positioning the phosphor pattern 22 and the shadow mask 24, for example, the shadow mask 24
It is also possible to measure the positions of the outer surface of the funnel 23 and the outer surface of the funnel 23, detect the amount of deviation from a predetermined amount, and shift the relative position of the panel 21 and the funnel 23 accordingly. This is because the phosphor pattern position with respect to panel 21 is correctly set to a predetermined amount on the exposure device, and the error is so small that it can be ignored.

EFFECTS OF THE INVENTION As described above, according to the method for manufacturing a color cathode ray tube of the present invention, since exposure can be performed by the master shadow mask attached to the exposure apparatus, the panel and the shadow mask can be attached and detached in the fluorescent screen forming step. It becomes unnecessary and the work can be greatly simplified. Also, by providing a shadow mask on the funnel side,
Since it is possible to adjust the relative position of the phosphor pattern formed on the panel, it is possible to sufficiently secure the assembly precision required for the color cathode ray tube. Also, by using a plate-shaped member for the panel, the cost can be reduced compared to the case of a panel having a conventional curvature, and the image surface formed by the phosphor pattern can be seen more easily and the image characteristics can be improved. Becomes

[Brief description of drawings]

FIG. 1 is a sectional view showing the construction of a color cathode ray tube according to an embodiment of the present invention, FIG. 2 is a partially exploded view for explaining the construction of the color cathode ray tube of FIG. 1, and FIG. 3 is an exposure apparatus of the embodiment. FIG. 4, FIG. 5 and FIG. 5 are views for explaining a method of performing relative alignment between a panel on which a phosphor pattern of the embodiment is formed and a shadow mask, and FIG. FIG. 7 is a sectional view showing the structure of the color CRT, and FIG. 7 is a view showing the structure of an exposure apparatus used for assembling a conventional color CRT. 21 …… Panel 22 …… Phosphor pattern 23 …… Funnel 24 …… Shadow mask 31 …… Exposure device 34 …… Stopper 35 …… Master shadow mask 41 …… Sealing frame 42 …… Neck stopper 43 …… Pad stopper 45 …… Shadow mask position detection mechanism 46 …… Floating mechanism 47 …… Reference plate 48 …… Camera

Claims (1)

[Claims] 1. A method for manufacturing a color cathode ray tube, comprising a shadow mask provided in a funnel, and a plate-shaped panel having a phosphor pattern formed on the inner surface of the funnel using an exposure device in an airtight manner. A step of forming a predetermined phosphor pattern on the inner surface of the plate-shaped panel by performing exposure with a master shadow mask provided in advance in the exposure apparatus, and performing relative positioning with respect to the funnel and the shadow mask to hermetically seal them. And a step of assembling the color cathode ray tube.