JPH031424A - Manufacture of color cathode ray tube(crt) - Google Patents

Abstract

PURPOSE:To make the work to attach, detach, and synchronously convey a panel and a shadow mask unnecessary by using a planer glass as a panel and carrying out exposure using a shadow mask of a master previously installed in an exposure apparatus at the time of phosphor pattern formation. CONSTITUTION:A panel 21 is prepared from the planer material such as a planer glass and a phosphor pattern 22 is formed on ones side of the panel. A shadow mask 35 of a master is installed in the down face of an open part of an exposure apparatus 32 and exposure of the phosphor plane of the panel 21 to light is carried out by radiating light from a light source 36 installed in the inside of the exposure stand 32 through a large number of small holes formed in the shadow mask 35 of the master. By this method, without works to synchronously convey and attach and detach the shadow mask and the panel in phosphor patterning process, a prescribed phosphor pattern is formed on the panel.

Description

[Detailed description of the invention] [Purpose of the invention] (Industrial application field) The present invention relates to a method of manufacturing a color cathode ray tube.

(Prior art) Conventionally, color cathode ray tubes have the following characteristics, as shown in Figure 6:
A shadow mask 1 and a frame 2 for reinforcing it are welded and fixed from the outer surface of the frame with a holder 3, and this holder 3 is attached to a bin 6 provided on the inner surface of a panel 5 on which a phosphor pattern 4 is formed. After installing, this panel 5
It is assembled by welding the glass to the funnel 7.

As a method for forming the phosphor pattern 4 of the panel 5,
As shown in FIG. 7, after the shadow mask 1 is assembled into the panel 5 whose inner surface is uniformly coated with phosphor, the exposure device 8 irradiates the phosphor with exposure light through the small holes 1a of the shadow mask 1. A method of exposing the material to light is used.

The exposure table 9 of the exposure apparatus 8 has a built-in light source 10, a plurality of lenses 11, and a filter 12, and a stopper 13 attached to the top surface of the exposure table 9 allows the panel 5 to be
Exposure is performed with the outer surface of the lens fixed in position. After exposure, the panel 5 is removed from the exposure device 8, and the shadow mask 1, frame 2, etc. incorporated in the panel 5 are removed from the panel 5 and developed. This development is performed by washing the inner surface of the panel with pure water to wash away the phosphor in the unexposed areas, and then drying.

After this development, a phosphor that emits a different color is applied to the entire inner surface of the panel, the same shadow mask 1 used in the above process is mounted inside the panel 5, and the exposure device 8 exposes the panel. A light source 10 of the exposure device 8 used at this time,
The relative positions of the lens 11 and the filter 12 with respect to the panel 5 are different from that of the exposure table 9 used in the above-mentioned process, so that a different part of the phosphor from the previous process can be exposed. .

In this way, three different phosphor patterns are formed by repeating the series of steps of phosphor coating, exposure, and development three times, and finally, the shadow mask 1 is mounted inside the panel 5. The panel 5 and funnel 7 are glass-welded.

In this way, a pattern consisting of three types of phosphors is formed,
In order to glass-weld the panel 5 and the funnel 7,
It is necessary to combine and separate the panel 5 and shadow mask 7 a total of four times, once for each exposure (total of three times for three types of phosphors) and once after the final phosphor development. After the shadow mask 1 has been exposed once, it is necessary to pass through all processes with the same combination of panel 5 and shadow mask 1.

Therefore, a worker is required to combine and separate the shadow masks, and furthermore, the two conveyances must be carried out synchronously at all times so that the combined state of the shadow masks does not deviate throughout the entire process.

(Problem to be solved by the invention) In this way, in the conventional method of manufacturing color cathode ray tubes, it is necessary to transport the panel and shadow mask in synchronization at all times, which makes the transport equipment complicated and the installation area of the assembly equipment large. This poses a problem in that it impedes space saving and increases capital investment. Furthermore, there is a problem in that the work becomes complicated because it is necessary to attach and detach the panel and mask each time exposure is performed.

The present invention was made in order to solve the above-mentioned conventional problems, and uses a master shadow mask in the process of forming the phosphor pattern of a color cathode ray tube, and when welding the glass of the panel and the funnel, the original shadow is removed. By adopting a method of aligning the mask and panel, it is possible to eliminate the need for synchronized transport of the shadow mask during phosphor pattern formation, and also eliminate the need for attaching and detaching the panel and shadow mask during exposure. The pattern formation process can be greatly simplified, and by using sheet glass for the panel, the cost of the panel can be significantly reduced, and the image quality can be improved compared to conventional panels with curvature. The object of the present invention is to provide a method for manufacturing a color cathode ray tube that can obtain the following characteristics.

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

(Function) In the present invention, plate glass is used as a panel,
When forming a phosphor pattern, by performing exposure using a master shadow mask pre-installed in the exposure device, it is possible to eliminate the need to attach and detach the panel and shadow mask.
In addition, it is possible to eliminate the need for synchronous conveyance of the panel and shadow mask, which has been necessary in the past.

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

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

The panel 21 is made of a flat member such as plate glass,
A phosphor pattern 22 is formed on one side thereof.

This panel 21 is airtightly integrally fixed to the opening of the funnel 23 by glass sealing. Also funnel 2
3, a shadow mask 24 is placed inside the frame 25.
The holder 26 is positioned and fixed to the funnel 23 by a pin 27 provided on the inner surface of the opening of the funnel 23.

In this way, 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 is as follows.
By changing the relative position of the panel 1 and the funnel 7, it is possible to change and adjust it as desired.

FIG. 3 is a diagram showing an example of the exposure device 31, in which the panel 21, whose entire surface is coated with phosphor, is supported on the exposure table 32 by spacers 33 vertically installed around the periphery of the upper opening of the exposure table 32. The side surface of the panel 21 is also positioned by a stopper 34 provided on the exposure table 32 so as to come into contact with the side surface of the panel 21 .

The master shadow mask 35 is attached to the lower surface of the opening of the exposure table 32, and the phosphor surface of the panel 21 is exposed by transmitting exposure light from the light source 36 inside the exposure table 32 into the master shadow mask 35 in large numbers. This is done by irradiating the fluorescent material of the panel 21 through the small hole 35a provided.

By using such an assembly method, there is no need to combine the shadow mask 24 and the panel 21 when exposing the phosphor.

Incidentally, the exposure apparatus 31 of the above embodiment is not provided with the lens 11 and the filter 12 that are provided in the conventional exposure apparatus 8 shown in FIG. 7. By setting the position and size of the small hole 35a in the master shadow mask 35 to be different from that of the original shadow mask, the original shadow mask can be used through the lens or filter. This is because the same conditions as those for exposure are created, and if the master shadow mask 35 is to have the same shape and small holes as the original shadow mask, a lens or filter is used.

By using the plate-shaped panel 21 as described above and the exposure device 31 incorporating the master shadow mask 35, the shadow mask 24 and the panel 21 can be synchronously transported in the phosphor pattern forming process and can be attached and detached during exposure. A predetermined phosphor pattern can be formed on the panel surface without any work. However, the exposure apparatus that exposes the three types of phosphors is the same as the conventional method, in that three exposure apparatuses are installed, each with a setting for each exposure apparatus, and exposure is performed three times.

After forming the phosphor pattern 22 on the panel 21 in this way, the relative position of the shadow mask 24 mounted in the funnel 23 and the phosphor pattern 22 on the panel is detected using, for example, a camera, and they are made to match. The position of the panel 21 with respect to the funnel 23 is adjusted in the manner shown in FIG.

FIG. 4 is a diagram showing a method of relative alignment between the panel on which the phosphor pattern described above is formed and the shadow mask. This is done when 24 is welded to the glass.

In FIG. 4, the funnel 23 is mounted on a sealing frame 41 and positioned by a neck stopper 42 that abuts near the constriction of the funnel and a pad stopper 43 that abuts the outer surface of the funnel opening. This pad stopper 43 is screwed onto a panel stopper 44, and is configured to be movable back and forth in a direction perpendicular to the funnel by means of this screw mechanism.

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

A reference plate 47 having a T-shaped cross section is suspended from the surface F of the floating mechanism 46 at approximately the center thereof, and one end of the lower plate 47a is positioned in contact with the panel stopper 44.

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

In this state, the two cameras 48 detect the shadow mask 2.
The position of the funnel 23, that is, the position of the shadow mask 24 with respect to the panel stopper 44, is set to the reference value by detecting the amount of relative positional deviation of the camera 48 and adjusting the pad stopper 43 based on the detected amount of positional deviation. match.

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

Note that other methods may be used to position the phosphor pattern 22 and the shadow mask 24; for example, the positions of the shadow mask 24 and the outer surface of the funnel 23 are determined by a total of Δ-1,
A method may also be used in which the amount of deviation from a predetermined amount is detected and the relative positions of the panel 21 and the funnel 23 are shifted by that amount. This is because the phosphor pattern position with respect to the 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 explained above, according to the method for manufacturing a color cathode ray tube of the present invention, exposure can be performed using a master shadow mask attached to an exposure device, so that attachment and detachment of the panel and shadow mask in the phosphor screen forming process is easy. This becomes unnecessary, and the work can be greatly simplified. In addition, by providing the shadow mask on the funnel side, the shadow mask and
Since it is possible to adjust the relative position of the phosphor patterns formed on the panel, it is possible to ensure sufficient assembly accuracy required for a color cathode ray tube.

In addition, by using a plate-like member for the panel, costs can be reduced compared to conventional panels with curvature, and the image surface formed by the phosphor pattern becomes easier to see, making it possible to improve image characteristics. becomes.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing the configuration of a color cathode ray tube according to an embodiment of the present invention, FIG. 2 is a partially exploded view for explaining the configuration of the color cathode ray tube of FIG. 1, and FIG. 3 is an exposure apparatus of an embodiment. FIG. 4 and FIG. 5 are diagrams for explaining the method of relative alignment between the panel on which the phosphor pattern of the embodiment is formed and the shadow mask, and FIG. 6 is a diagram showing the conventional configuration. FIG. 7 is a cross-sectional view showing the structure of a color cathode ray tube, and FIG. 7 is a diagram showing the structure of an exposure apparatus used for assembling a conventional color cathode ray tube. 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 applicant Toshiba Corporation

Claims (1)

[Claims] In a method for manufacturing a color cathode ray tube, in which a shadow mask is provided in a funnel, and a plate panel on which a phosphor pattern is formed on the inner surface using an exposure device is hermetically sealed to the funnel, A step of performing exposure using a provided master shadow mask to form a predetermined phosphor pattern on the inner surface of the plate-like panel, and a step of assembling the funnel and the shadow mask by aligning them relative to each other and airtightly sealing them. A method for manufacturing a color cathode ray tube, comprising: