JPH0757663A - Cathode-ray tube - Google Patents

Abstract

(57) [Summary] [Configuration] A substantially rectangular flat first plate 30, a side wall 31 extending substantially vertically from the peripheral edge thereof, and a substantially rectangular shape parallel to and facing the first plate through the side wall 31. A vacuum envelope 34 having a flat second plate 32 and a plurality of plate supporting means 42 arranged between the first and second plates and supporting the first and second plates are provided. The phosphor screen 37 formed on the inner surface of the plate has a plurality of regions formed by electron beams emitted from a plurality of electron guns 41.
In the cathode ray tube which scans by dividing into R1 to R20, the plate supporting means adjacent to the side wall is arranged at a distance narrower than the minimum distance between the plurality of plate supporting means with respect to the side wall. [Effect] It is possible to eliminate the deformation of the first plate and provide a cathode ray tube that displays an image of good quality.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cathode ray tube such as a color picture tube, and in particular, a flat face plate and a flat rear plate are joined via a side wall, and the face plate and the flat rear plate are joined together. The present invention relates to a cathode ray tube in which plate supporting means is arranged.

[0002]

2. Description of the Related Art In recent years, various studies have been made on high-definition broadcasting or a high-resolution picture tube having a large screen accompanying the broadcasting. 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, conventionally, a method of arranging a plurality of independent small picture tubes to obtain a high-resolution large screen is disclosed in JP-A-48-90428, JP-A-49-21019 and JP-A-53. -117130 gazette etc. are disclosed. This kind of method is effective for displaying a huge screen with a large number of divisions arranged outdoors, but the screen size is 40
When displaying a medium-sized large screen of about inch, the connection part of the screen between each area is conspicuous and an unpleasant 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, and Japanese Patent Publication No. 50-17167 have a structure in which a plurality of independent phosphor screens of picture tubes are integrated. Is disclosed. As shown in FIG. 2, the picture tube having the phosphor screen of this integrated structure includes a face plate 1, a rear plate 2 facing the face plate 1, and a plurality of funnels 3 connected to the rear plate 2. A vacuum envelope 5 is configured, and a phosphor clean 6 having an integrated structure is formed on the inner surface of the face plate 1. The face plate 1 is made of glass, and the rear plate 2 is made of glass or metal.

However, in such a structure, when the screen surface becomes large, the face plate 1 and the rear plate 2 must be made thick so as to withstand the atmospheric pressure load, and in the tube axis direction. It is also necessary to have a large curvature. As a result, the weight of the envelope 5 becomes heavy. Further, when the curvature of the face plate 1 becomes large, the screen becomes difficult to see. Furthermore, the distance between the phosphor screen 6 and the electron gun 8 enclosed in the neck 7 becomes large, and the electron lens becomes unfavorable in terms of magnification.

Therefore, in order to solve the above problems, it is necessary to make the face plate have a relatively flat and large area. In this case, it is necessary to provide plate support means to support the atmospheric pressure load applied to the face plate.

The provision of such plate support means is known in connection with solar heat collectors in which the interior of the envelope is evacuated, and also as a flat cathode ray tube.
106353, JP 62-272432, JP 62-285335, and JP 63-1.
28532, JP-A-48-90183, JP-A-64-10553, JP-A-1-117251.
It is disclosed in Japanese Patent Publication No.

However, as shown in FIGS. 3 and 4, the plate supporting means 10 in the solar heat collector 9 has a long plate shape, and as shown in FIG. 5, the plate supporting means in the cathode ray tube 11 is used. Reference numeral 10 is needle-shaped, and particularly in the case of this cathode ray tube 11, an extremely large number of needle-shaped plate supporting means 10 are arranged. Therefore, the use of such plate supporting means 10 complicates the manufacture of the cathode ray tube and increases the material cost. In particular, when alignment with the phosphor screen formed on the inner surface of the face plate is required, this alignment becomes extremely difficult.
Further, the cathode ray tube 11 includes a large number of linear cathodes 12,
Since a plurality of control electrodes 13 (first to fourth grids), accelerating electrodes 14, deflection electrodes 15 (horizontal deflection electrodes, vertical deflection electrodes), etc. are arranged inside the tube, manufacturing is extremely difficult and there are many members inside the tube. Therefore, there are many problems such that deterioration of life characteristics due to gas released from the various pipe members cannot be avoided.

As a solution to the problems of the cathode ray tube having such a flat face plate, Japanese Patent Application Nos. 2-216207 and 2-22628 relating to the present inventor.
No. 8 or the like has a flat face plate 16 (first plate), as shown in FIG.
Sidewalls 17 extending in a substantially vertical direction from the periphery of the
A vacuum envelope 20 is constituted by a flat rear plate 18 (second plate) that faces the face plate 16 in parallel via the side wall 17 and a plurality of funnels 19 joined to the rear plate 18, and the face thereof is formed. Between the plate 16 and the rear plate 18, the plate support means 10 for supporting the atmospheric load applied to the face plate 16 and the rear plate 18 is arranged, and the funnel 19 is provided.
The fluorescent screen 23 of the integrated structure formed on the inner surface of the face plate 16 is divided into a plurality of regions by the electron beams emitted from the plurality of electron guns 22 sealed in the respective necks 21 and scanned. A simple and practical cathode ray tube is shown.

However, with this cathode ray tube, it has been found that the image becomes abnormal around the phosphor screen 23. The cause is that the side wall 17 and the plate supporting means 10
It is considered that the deformation due to the atmospheric pressure load is slightly different between the central portion and the peripheral portion of the face plate 16 due to the difference in the support structure with respect to the atmospheric pressure load. Such a problem is particularly caused in the color picture tube in which the shadow mask is arranged so as to face the phosphor screen and inside thereof, in addition to the difference in the supporting structure between the side wall and the plate supporting means against the atmospheric pressure load, the side wall and Height difference from the plate support means,
The face plate, the side wall, the rear plate are joined in the manufacturing process of the color picture tube, and the mounting condition of the plate supporting means is changed, so that the electron beam does not land correctly on the three-color phosphor layer and appears as mislanding.

[0012]

As described above, as a practical cathode ray tube having a large screen of high resolution and a short depth, a flat face plate and a peripheral portion of the face plate are substantially used. A vacuum envelope is configured by a side wall extending in a vertical direction, a flat rear plate facing in parallel with the face plate through the side wall, and a plurality of funnels joined to the rear plate,
Plate supporting means for supporting an atmospheric pressure load applied to the face plate and the rear plate is arranged between the face plate and the rear plate, and emitted from a plurality of electron guns sealed in each neck of the funnel. A cathode ray tube has been proposed in which a phosphor screen having an integrated structure formed on the inner surface of a face plate is divided into a plurality of regions and scanned by an electron beam.

However, with this cathode ray tube, it was found that the image became abnormal around the phosphor screen. It is considered that the cause is that the deformation due to the atmospheric pressure load is slightly different between the central portion and the peripheral portion of the face plate due to the difference in the supporting structure between the side wall and the plate supporting means against the atmospheric pressure load, especially in the phosphor screen. In a color picture tube in which a shadow mask is arranged so as to face each other, in addition to the difference in the supporting structure between the side wall and the plate supporting means against the atmospheric load, the difference in the height between the side wall and the plate supporting means and the color The face plate, the side wall, and the rear plate are joined in the process of manufacturing the picture tube, and the mounting conditions of the plate supporting means are also affected, so that there is a problem that electron beams do not land correctly on the three-color phosphor layer.

The present invention has been made in order to solve the above problems, and has a flat face plate and a flat rear plate which are opposed to each other in parallel. An atmospheric pressure load applied to the face plate and the rear plate is provided. An object of the present invention is to prevent an abnormal image in the peripheral portion of the phosphor screen formed on the inner surface of the face plate in the cathode ray tube in which the supporting plate supporting means is arranged between them.

[0015]

[Means for Solving the Problems] First flat surface having a substantially rectangular shape
A vacuum envelope having a plate, a side wall extending substantially perpendicularly from a peripheral portion of the first plate, and a flat second plate having a substantially rectangular shape facing the first plate in parallel through the side wall; A plurality of plate supporting means arranged between the first and second plates and supporting the first and second plates are provided, and the phosphor screen formed on the inner surface of the first plate is emitted from the plurality of electron guns. In a cathode ray tube which is divided into a plurality of regions and scanned by an electron beam, the plate supporting means adjacent to the side wall is arranged at a distance narrower than the minimum distance between the plurality of plate supporting means. .

[0016]

As described above, when the plate supporting means adjacent to the side wall is arranged at a distance narrower than the minimum distance between the plurality of plate supporting means, the central portion and the peripheral portion of the first plate are separated from each other. It is possible to eliminate a subtle difference in deformation due to the atmospheric pressure load, and it is possible to prevent an image abnormality caused by a difference in change between the central portion and the peripheral portion of the first plate.

[0017]

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

FIG. 1 shows the construction of a color picture tube which is one of the embodiments. This color picture tube is joined to a substantially rectangular flat face plate 30 (first plate) made of glass and a peripheral edge of the face plate 30 with a joining material such as frit glass, and is substantially joined to the face plate 30. A side wall 31 made of glass extending perpendicularly to, and facing the face plate 30 in parallel through the side wall 31,
A substantially rectangular flat glass rear plate 32 (second plate) that is also joined by a joining material such as frit glass, and a plurality of glass plates that are also joined to this rear plate 32 by a joining material such as frit glass. It has a vacuum envelope 34 composed of a funnel 33. The plurality of funnels 33 are joined around a plurality of openings 35 formed in the rear plate 32, respectively, and in the illustrated example, five in the horizontal direction (X direction) and four in the vertical direction (Y direction). A total of 20 funnels 33 are shown.

On the inner surface of the face plate 30,
A stripe-shaped three-color phosphor layer that emits blue, green, and red and a black stripe phosphor screen 37 that is provided so as to be embedded between the three-color phosphor layers are formed, and face this phosphor screen 37. Then, the shadow mask 38 is supported and arranged inside thereof by a mask connecting means 39 having a U-shaped cross section fixed to the rear plate 32. An electron gun 41 is provided in each neck 40 of the funnel 33.
Is sealed. Further, a plurality of plate supporting means 42 are arranged at a predetermined interval between the face plate 30 and the rear plate 32.

The plate support means 42 is for supporting the flat face plate 30 and the rear plate 32 against the atmospheric pressure load applied to the vacuum envelope 34, and has a tip end that abuts on the inner surface of the face plate 30. The portion is formed in a wedge shape, and the base end portion is fixed to the rear plate 32. The distance P between the plate support means 42 is
For the plate thickness t of the face plate 30, preferably, t / P ≧ 0.05, and in particular, the plate supporting means 42 adjacent to the side wall 31 has a minimum distance between the plate supporting means 42 with respect to the side wall 31. It is arranged narrower than the space.

The color picture tube deflects the electron beam emitted from each electron gun 41 in the horizontal and vertical directions by a magnetic field generated by a deflecting device (not shown) mounted outside each funnel 33. Then, the phosphor screen 37 is divided into a plurality of regions, in the illustrated example, five in the horizontal direction and four in the vertical direction, for a total of 20 regions R1 to R20 and scanned. The screens drawn on the phosphor screen 37 by this divisional scanning are connected by the signals applied to the electron gun 41 and the deflecting device, and one large image without duplication or discontinuity is reproduced on the entire surface of the phosphor screen 37.

Such a color picture tube can be manufactured by the following method.

The phosphor screen 37 is previously formed on the inner surface of the face plate 31 by a photographic printing method using a master mask having a predetermined pattern corresponding to the phosphor layer, for example. Further, at a predetermined position on the inner surface of the rear plate 32, mask erection means 39 for supporting the shadow mask 38 and a plurality of plate supporting means 42 for supporting the atmospheric pressure load applied to the face plate 30 and the rear plate 32 are coated with frit glass. The shadow mask 38 is fixed by firing, and the shadow mask 38 is welded to the mask erection means 39 under tension. The electron gun 41 is sealed in each neck 40 of the plurality of funnels 33.

Next, the face plate 30 having the phosphor screen 37 formed thereon, a plurality of side wall pieces constituting the side wall 31, the rear plate 32 to which the shadow mask 38 and the plate supporting means 42 are fixed, and the electron gun 41 are sealed. A plurality of the stopped funnels 33 are positioned in a predetermined relationship, and these are joined together by firing the coated frit glass. Then, it is manufactured by evacuating the envelope 34 that is integrally assembled.

As a method of manufacturing this color picture tube device, in addition to the above, for example, after the funnel 33 is joined to the rear plate 32, the electron gun 4 is placed in the neck 40 of the funnel 33.
1 may be sealed, or it can be manufactured by other methods such as joining the side wall 31 to the face plate 30 or the rear plate 32 in advance.

By the way, of the plurality of plate supporting means 42 supporting the face plate 30 and the rear plate 32 against the atmospheric pressure load applied to the vacuum envelope 34 as described above, the plate supporting means adjacent to the side wall 31. 42
Is arranged on the side wall 31 narrower than the minimum distance between the plate supporting means 42, the central portion and the peripheral portion of the face plate caused by the difference in the supporting structure between the conventional side wall and the plate supporting means against the atmospheric load. It is possible to eliminate a subtle difference in deformation from the above and hold the entire face plate 30 flat. As a result, the face plate 3
0 and the shadow mask 38 are kept in parallel over the entire surface,
It is possible to prevent a mislanding that has conventionally occurred in the peripheral portion of the face plate 30 and to provide a color picture tube that displays a good-quality color image on the entire screen.

In the above embodiment, the shadow mask is supported by the mask erection means having a U-shaped cross section, but the mask erection means for supporting the shadow mask may have another structure.

When the tip of the plate supporting means close to the side wall is arranged on the outer circumference of the phosphor layer or on the outside thereof, it is not necessary to form the tip in a wedge shape. It may be shaped or the like.

In addition, although the color picture tube has been described in the above embodiment, the present invention is also applicable to other cathode ray tubes having a flat face plate.

[0030]

The first flat plate having a substantially rectangular shape, the side wall extending substantially vertically from the peripheral portion of the first plate, and the substantially rectangular shape parallel to the first plate through the side wall. A vacuum envelope having a flat second plate and a plurality of plate supporting means arranged between the first and second plates and supporting the first and second plates are provided, and the vacuum envelope is formed on the inner surface of the first plate. In a cathode ray tube which scans the phosphor screen thus divided into a plurality of regions by an electron beam emitted from a plurality of electron guns, a plurality of plate supporting means adjacent to the side wall are provided to the side wall. If the distance between the means is narrower than the minimum distance, it is possible to eliminate a subtle difference in deformation between the central portion and the peripheral portion of the first plate due to the atmospheric pressure load, and the peripheral portion of the conventional face plate can be eliminated. Preventing mislanding Flip has, may be a cathode ray tube for displaying a quality good image in the entire screen.

[Brief description of drawings]

FIG. 1 (a) is a perspective view showing the overall configuration of a color picture tube which is an embodiment of the present invention, and FIG. 1 (b) is its B.
It is a -B sectional view.

FIG. 2 (a) is a perspective view showing the configuration of a conventional picture tube, and FIG. 2 (b) is a sectional view thereof.

FIG. 3 is a diagram showing a configuration of a solar heat collector in which plate supporting means is arranged.

FIG. 4 (a) and FIG. 4 (b) are views showing configurations of different solar heat collectors in which plate supporting means are arranged.

5 (a) to 5 (c) are views showing a configuration of a cathode ray tube in which a conventional plate supporting means is arranged.

FIG. 6 is a diagram showing a configuration of a cathode ray tube having a flat face plate and a flat rear plate.

[Explanation of symbols]

 30 ... Face plate 31 ... Side wall 32 ... Rear plate 33 ... Funnel 34 ... Vacuum envelope 37 ... Phosphor screen 38 ... Shadow mask 39 ... Mask installation means 41 ... Electron gun 42 ... Plate support means R1 to R20 ... Area

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yuji Haraguchi 1-9-2 Harara-cho, Fukaya-shi, Saitama Inside Fukaya Electronics Factory, Toshiba Corporation (72) Eiji Kamaba 1-chome, Harara-cho, Fukaya, Saitama No. 2 inside Toshiba Fukaya Electronics Factory

Claims (1)

[Claims] 1. A substantially rectangular flat first plate, a side wall extending substantially vertically from a peripheral portion of the first plate, and a substantially rectangular shape parallel to and facing the first plate through the side wall. A vacuum envelope having a flat second plate and a plurality of plate supporting means arranged between the first and second plates and supporting the first and second plates. In a cathode ray tube in which a phosphor screen formed on an inner surface is divided into a plurality of regions by an electron beam emitted from a plurality of electron guns and scanned, the plate supporting means adjacent to the side wall is provided. A cathode ray tube, wherein the cathode ray tube is arranged at a distance narrower than a minimum distance between a plurality of plate supporting means.