JPH05234516A - Manufacture of cathode-ray tube - Google Patents

Abstract

PURPOSE:To prevent any damage on a phosphor screen. CONSTITUTION:A cathode-ray tube is provided with an almost rectangular, flat first plate 10 with a phosphor screen 18 formed thereon; side walls 11 each extending substantially perpendicularly to the first plate from the peripheral portion of the first plate; an approximately rectangular, flat second plate 13 opposed substantially parallel to the first plate via the side walls; and supporting means 21 each interposed between the first and second plates for supporting them. The supporting means are fixed to the inner surface of the second plate. The tip ends of the supporting means are located in a non-contact state in predetermined positions of a phosphor screen formed in the first plate. The first plate, side walls and second plate are joined together.

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, and more particularly to a flat first plate, a flat second plate facing substantially parallel to the first plate, and the first and second flat plates. And a supporting means for supporting the second plate.

[0002]

2. Description of the Related Art In recent years, various studies have been made on a high-definition picture tube having a high-definition broadcast or a large screen accompanying it. Generally, in order to achieve high resolution of the picture tube, the spot diameter of the electron beam on the phosphor screen must be reduced. On the other hand, conventionally, the electrode structure of the electron gun has been improved, or the electron gun itself has been increased in diameter and length, but sufficient results have not yet been obtained. The main reason for this is that as the tube becomes larger, the distance from the electron gun to the phosphor screen becomes longer and the magnification of the electron lens becomes too large. Therefore, in order to achieve high resolution, it is important to reduce the distance (depth) from the electron gun to the phosphor screen. Further, in this case, wide-angle deflection causes an increase in the difference in magnification between the center and the periphery of the screen. Therefore, wide-angle deflection is not a good idea for high resolution.

Therefore, a method of arranging a plurality of independent small picture tubes to obtain a high-resolution large screen has been disclosed in Japanese Patent Laid-Open Nos. 48-90428, 49-21019, and 53-53. -117130 gazette etc. are disclosed. This kind of method is effective for displaying a large screen with a large number of divisions placed outdoors, but the screen size is 4
When displaying a medium-scale large screen of about 0 inch, the connection portion of the screen between the areas is conspicuous, and an obtrusive image is reproduced. Therefore, when used as a home television receiver or as a terminal for graphic display in computer-aided design (CAD), the connection part of the screen becomes a fatal defect.

In contrast, US Pat. No. 3,071,7
No. 06, Japanese Utility Model Publication No. 39-25641, Japanese Patent Publication No. 42-4928, Japanese Patent Publication No. 50-17167, etc., a cathode line having a structure in which a plurality of independent phosphor screens of picture tubes are integrated. A tube is disclosed.

As shown in FIG. 6, this cathode ray tube has a face plate 2 having a phosphor screen 1 formed on the inner surface thereof.
(First plate), rear plate 3 facing the face plate 2 (second plate), rear plate 3
The vacuum envelope comprises a plurality of funnels 4 following and a plurality of necks 5 provided on each funnel 4. The face plate 2 is made of glass and the rear plate 3 is made of glass or metal.

However, in such a cathode ray tube, when the screen surface becomes large, the face plate 2 and the rear plate 3 must be thickened in order to support the atmospheric pressure applied to the vacuum envelope. It is also necessary to have a large curvature in the tube axis direction. As a result, not only the weight of the envelope becomes heavy, but also the curvature of the face plate becomes large, which makes the screen difficult to see. Furthermore, the distance between the phosphor screen 1 and the electron gun 6 enclosed in the neck 5 becomes large, and the electron lens becomes unfavorable in terms of magnification.

In order to solve such a problem, conventionally, a cathode ray tube having a flat face plate has been proposed. However, if the face plate is made flat and its area is increased, a supporting means for supporting the atmospheric pressure applied to the face plate is required.

It has been known in the past to provide a support means for a vacuum envelope having a flat face plate when the face plate is enlarged, in connection with a solar heat collector for making a vacuum inside the envelope. Also, as a flat display device, JP-A-56-106353, JP-A-62-272432, and JP-A-62-28533 are also available.
5, JP-A-63-128532, JP-A-4
It is disclosed in JP-A 8-90183, JP-A 64-10553, JP-A 1-117251.

However, in the case of a cathode ray tube having a phosphor screen on the inner surface of a flat face plate and having a supporting means for supporting the face plate, it is difficult to provide the supporting means so as not to damage the phosphor screen in the manufacturing process. is there. For example, in the case of a color picture tube, the phosphor screen is formed on the inner surface of the face plate in advance by a photolithography method and is assembled using the face plate on which the phosphor screen is formed. There is a problem in that the supporting means for supporting the phosphor comes into contact with the phosphor screen and is damaged or peeled off, resulting in a fatal defect in the display device.

[0010]

As described above, in the cathode ray tube having the phosphor screen on the inner surface of the flat face plate, when the area of the face plate becomes large, the supporting means for supporting the atmospheric pressure applied to the face plate is provided. is necessary. However, such a cathode ray tube is
There is a problem that the supporting means comes into contact with the phosphor screen previously formed on the inner surface of the face plate and is damaged or peeled off, which causes a fatal defect in the display device.

The present invention has been made in order to solve the above-mentioned problems, and a cathode ray tube having a supporting means for supporting the atmospheric pressure applied to a flat face plate is preliminarily formed on the inner surface of the face plate. It is an object to obtain a method for producing a body screen without damaging or peeling it off.

[0012]

A substantially rectangular flat first plate having a phosphor screen formed on an inner surface thereof and a side wall extending from a peripheral portion of the first plate substantially perpendicularly to the first plate. And a substantially rectangular flat second plate that faces the first plate substantially in parallel through the side wall, and the first and second plates that are located between the first and second plates.
In a method of manufacturing a cathode ray tube comprising a supporting means for supporting a plate, after fixing the supporting means to the inner surface of the second plate, the tip of the supporting means fixed to the inner surface of the second plate is attached to the inner surface of the first plate. Positioning the formed phosphor screen in a non-contact state at a predetermined position, and thereafter joining the first plate having the phosphor screen formed on its inner surface to the side wall and the second plate having the supporting means fixed to the inner surface. I chose

[0013]

As described above, after the supporting means is fixed to the inner surface of the second plate, the tip of the supporting means fixed to the inner surface of the second plate is provided with a predetermined phosphor screen formed on the inner surface of the first plate. When the first plate having the phosphor screen formed on the inner surface and the side wall and the second plate having the supporting means fixed to the inner surface are joined to each other, the phosphor screen and the support are attached in the manufacturing process. Damage to the phosphor screen due to contact with the tip of the means can be avoided. Further, when the tip of the supporting means exhausts the envelope obtained by joining the first plate, the side wall and the second plate to which the supporting means is fixed, and when the atmospheric pressure is applied to the first and second plates. In addition, since the force applied to the phosphor screen formed on the inner surface of the first plate is perpendicular to the supporting means, damage to the phosphor screen due to contact with the tip of the supporting means is prevented at this time as well.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described based on embodiments with reference to the drawings.

FIG. 1 shows a cathode ray tube according to the embodiment. The cathode ray tube is joined to a face plate 10 (first plate) made of flat glass having a substantially rectangular shape and a peripheral portion of the face plate 10.
A side wall 11 of glass extending substantially perpendicular to
And a rear plate 13 (second plate) made of substantially rectangular flat glass which is opposed to the face plate 10 through the side wall 11 and is joined in parallel, and the rear plate
A vacuum envelope (15) composed of a funnel (14) made of a plurality of glasses and joined to (13). The rear plate 13 is formed with a plurality of openings, and each funnel 14
Are joined so as to cover the respective openings.

On the inner surface of the face plate 10, a phosphor screen 18 having a one-color to three-color phosphor layer 16 and a light absorption layer 17 for improving contrast is formed. Further, in each neck 19 provided in the plurality of funnels 14, an electron gun 20 (electron beam emitting means) is provided.
Are arranged. Further, between the face plate 10 and the rear plate 13, a supporting means 21 including a plurality of metal supporting columns and the like is provided.

This cathode ray tube has a deflection yoke (not shown) mounted on the outside of each funnel 14 for electron beams emitted from a plurality of electron guns 20 arranged in each neck 20.
The phosphor screen 18 is divided into a plurality of areas by scanning in a horizontal and vertical direction by means of the scanning, and the screen obtained on the phosphor screen 18 by this division scanning is applied to the electron gun 21 and the deflection yoke. The fluorescent screen 18 is connected by the signals generated by the signal to form a single large screen without interruption.

The supporting means 21 is for supporting the atmospheric pressure applied to the face plate 10 and the rear plate 13 of the vacuum envelope 15, is fixed to the inner surface of the rear plate 13, and the tip portion is formed in a wedge shape. Being faceplate 10
Is in contact with the phosphor screen 18 formed on the inner surface of the. Regarding the contact of the supporting means 21 with the phosphor screen 18, it is necessary to properly position the tip of the supporting means 21 on the light absorption layer 17 of the phosphor screen 18 so that the tip of the supporting means 21 cannot be seen from the outside through the face plate 10. Is.

As described above, the tip of the supporting means 22 is properly positioned on the light absorbing layer 17 of the phosphor screen 18, and the phosphor screen 18 formed on the inner surface of the face plate 10 is not damaged. The cathode ray tube is manufactured as follows.

First, as shown in FIG. 2, a face plate
A light absorption layer and a phosphor layer are formed on the inner surface of 10 by a method such as photolithography to form a phosphor screen 18.

On the other hand, as shown in FIG. 3, the rear plate 13
The supporting means 21 is fixed to a predetermined position on the inner surface of the substrate with a bonding agent such as frit glass. In addition, as shown in FIG. 4, an electron gun is installed in the necks 19 of the plurality of funnels 14.
20 is sealed.

Next, as shown in FIG. 5, an assembling jig 27 having a supporting portion 25 for positioning and supporting the face plate 10 on the base 24 and a supporting portion 26 for supporting the rear plate 13 so as to be able to move up and down is used. The face plate 10 on which the phosphor screen 18 is formed is positioned and mounted on the support portion 25 with the phosphor screen 18 facing upward. On the other hand, the support
The rear plate 13 of the supporting means 21 fixed on the 26,
The supporting means 21 is mounted so as to face the face plate 10 positioned and mounted on the supporting portion 25. After that, the rear plate 13 placed on the supporting portion 26 is moved by the adjusting device 28 provided on the base 24, and the tip of the supporting means 21 fixed to the rear plate 13 is placed on the supporting portion 25. The position is adjusted so as to match the light absorption layer of the phosphor screen 18 formed on the face plate 10 which is positioned and placed on.

Next, a side wall 11 having frit glass 29 applied to the upper and lower edges and an exhaust pipe (not shown) attached to the side surface is arranged between the face plate 10 and the rear plate 13. Then, the vertically movable support portion 26 is moved to vertically lower the rear plate 13 mounted on the support portion 26 onto the side wall 11. In this case, the width w of the side wall 11 and the frit glass 29 applied to the upper and lower edges thereof.
The thickness of the support means 21 fixed to the rear plate 13 is
Is set to a thickness that does not contact the phosphor screen 18 formed on the face plate 10.

Then, on the rear plate 13, a funnel having an electron gun sealed in the neck and an end face coated with frit glass is placed. Then, the face plate 10, the side wall 11, the rear plate 13 and the funnel assembled on the assembling jig 27 are put into a heating furnace as they are, and they are integrally joined by sintering the frit glass 29. In this case, the thickness of the frit glass 29 is changed by sintering, and the supporting means fixed to the rear plate 13 is used.
The tip of 21 may come into contact with the phosphor screen 18 formed on the face plate 10, but the tip of the supporting means 21 is accurately aligned so as to match the light absorption layer of the phosphor screen 18. And the support means 21 only move vertically with respect to the phosphor screen 19,
The phosphor layer is not damaged or peeled off.

Thereafter, the cathode ray tube evacuates the envelope in which the face plate 10, the side wall 11, the rear plate 13 and the funnel are integrally joined as described above through the exhaust pipe attached to the side wall 11. It is manufactured by Due to the atmospheric pressure applied to the face plate 10 by this exhaust, the supporting means 21 fixed to the inner surface of the rear plate 13
The tip end of the contact surface contacts the light absorption layer of the phosphor screen 18 formed on the inner surface of the face plate 10.

By the way, as described above, the support means 21 is fixed to the inner surface of the rear plate 13, and the tip of the support means 21 is formed on the inner surface of the face plate 10.
The width w of the side wall 11 and the thickness of the frit glass 29 applied to the upper and lower edges of the side wall 11 are set so as not to contact the side wall 18, and the face plate 10, the side wall 11, the rear plate 13 and the funnel are integrally joined. Then, it is possible to surely prevent the phosphor screen 18 from being damaged by the contact between the supporting means 21 and the phosphor screen 18 which is likely to occur in the manufacturing process of the cathode ray tube.
Moreover, the tip end of the supporting means 21 set as described above is pressed by the atmospheric pressure applied to the face plate 10 after exhaust, and contacts the phosphor screen 18 formed on the inner surface thereof to support the face plate 10. However, in this case, since the force applied to the face plate 10 and the phosphor screen 18 formed on the inner surface thereof is perpendicular to the supporting means 21, the phosphor screen 18 is not damaged or peeled off.

Next, another embodiment will be described.

In the above-mentioned embodiment, the electron gun is previously sealed in the funnel and the envelope is assembled using the sealed funnel of the electron gun. However, the envelope is assembled in the rear plate. The electron gun may be sealed after the funnel has been joined to.

Further, in the above-mentioned embodiment, the cathode ray tube in which the exhaust pipe is provided on the side wall has been described. However, this exhaust pipe may be provided in the neck of the funnel similarly to the ordinary cathode ray tube.

Further, in the above embodiment, the tip of the supporting means fixed to the inner surface of the rear plate is aligned with the light absorbing layer of the phosphor screen formed on the inner surface of the face plate, and then the rear plate and the face are aligned. A side wall was placed between the plate and the side plate.This side wall was previously placed between the rear plate and the face plate, and then the tip of the support means fixed to the rear plate was used to absorb light from the phosphor screen. It may be aligned with the layers.

The support means fixed to the rear plate and the phosphor screen formed on the face plate may be aligned by a jig or a method other than the assembling jig shown in the above embodiment. Is.

Furthermore, in the above embodiment, the envelope is assembled by using the side wall which is separate from the face plate and the rear plate, but this side wall may be formed integrally with the face plate or the rear plate. ..

In the above embodiment, a cathode ray tube having a structure in which a plurality of funnels are attached to the rear plate and an electron gun is sealed at the neck of the funnels has been described.
The present invention can also be applied to a cathode ray tube having an electron source and an electron beam emitting means composed of a plurality of electrodes between a face plate and a rear plate.

[0034]

The first plate having a substantially rectangular shape having the phosphor screen formed on the inner surface thereof, the side wall extending from the peripheral portion of the first plate substantially perpendicularly to the first plate, and the side wall. A substantially rectangular flat second plate that faces the first plate substantially in parallel with the first plate and the second plate.
In a method of manufacturing a cathode ray tube, which is provided between the plates and has a supporting means for supporting the first and second plates,
After fixing the supporting means to the inner surface of the second plate, the tip of the supporting means fixed to the inner surface of the second plate is positioned in a non-contact state at a predetermined position of the phosphor screen formed on the inner surface of the first plate. After that, when the first plate having the phosphor screen formed on the inner surface and the side wall and the second plate having the supporting means fixed on the inner surface are joined together, the phosphor due to the contact between the phosphor screen and the tip of the supporting means in the manufacturing process. You can avoid damage to the screen. In addition, the tip of the supporting means has a phosphor screen due to the atmospheric pressure applied to the first plate when the envelope obtained by joining the first plate, the side wall and the second plate to which the supporting means is fixed is evacuated. Although they come into contact with each other, the force applied to the phosphor screen at this time is perpendicular to the supporting means, so that the phosphor screen can be prevented from being damaged and the required cathode ray tube can be obtained.

[Brief description of drawings]

FIG. 1 (a) is a perspective view showing the configuration of a cathode ray tube according to an embodiment of the present invention, and FIG. 1 (b) is a sectional view thereof.

FIG. 2 is a view of a face plate having a phosphor screen, which is shown for explaining the method for manufacturing the cathode ray tube.

FIG. 3 is a view of a rear plate to which the supporting means is also fixed.

FIG. 4 is a view of a sealed funnel of the electron gun.

FIG. 5 is a diagram showing a method of assembling a face plate on which a phosphor screen is formed, a side wall, a rear plate on which a supporting means is fixed, and a funnel sealed on an electron gun.

FIG. 6 (a) is a perspective view showing the structure of a conventional cathode ray tube, and FIG. 6 (b) is a sectional view thereof. It is a perspective view showing a support means.

[Explanation of symbols]

 10 ... Face plate (first plate) 11 ... Side wall 13 ... Rear plate (second plate) 14 ... Funnel 15 ... Enclosure 16 ... Phosphor layer 17 ... Light absorption layer 18 ... Phosphor screen 19 ... Neck 20 ... Electron Gun (electron beam emitting means) 21 ... Supporting means 25 ... Supporting part 26 ... Supporting part 27 ... Assembly jig 28 ... Adjusting device 29 ... Frit glass

Claims (1)

[Claims] 1. A substantially rectangular first flat plate having a phosphor screen formed on an inner surface thereof, and a side wall extending from a peripheral portion of the first plate substantially perpendicularly to the first plate, A substantially rectangular flat second plate facing substantially parallel to the first plate through a side wall, and a support that is located between the first and second plates and supports the first and second plates. In the method of manufacturing a cathode ray tube, the support means is fixed to the inner surface of the second plate, and the tip of the support means fixed to the inner surface of the second plate is formed on the inner surface of the first plate. The phosphor screen is positioned in a non-contact state at a predetermined position, and then the first plate having the phosphor screen formed on the inner surface thereof is in contact with the side wall and the second plate having the supporting means fixed to the inner surface. A cathode ray tube manufacturing method which is characterized in that.