JPH06187927A - Cathode-ray tube - Google Patents

Abstract

PURPOSE:To prevent unnecessary light emission and dislocation of landing, and to display an image having the excellent quality by tightly sticking a mask part, which is separated from a phosphor screen by supports and opposite to the screen, to partitioning plates, which are provided on the inner surface of a rear plate and which regulates the scanning of electron beam. CONSTITUTION:A vacuum case 6 consists of a rectangular flat face plate 1, a rectangular flat rear plate 3, funnels 5 bonded to twenty opening holes 4 of the rear plate 3, which is separated from the face plate 1 by side walls 2, necks 8 and electron guns 9. Partitioning plates 26 having twenty opening holes for regulating the scanning of electron beam from the electron guns 9, and a fixation part 22 and a mask stretching means 23 are arranged on the inner surface of the rear plate 3. A phosphor screen 7 formed on the inner surface of the face plate 1 and a shadow mask 10, which is separated from the face plate 1 by supports 28 and opposite to the plate 1, are tightly stuck to the partitioning plates 26, and fixed to the mask stretching means 23. Unnecessary light emission and dislocation of landing are thereby prevented to display an image having the excellent quality.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is provided with a mask portion for selecting an electron beam which faces a phosphor screen formed on the inner surface of a flat face plate, and the phosphor screen is provided in a plurality of regions. The present invention relates to a cathode ray tube that divides and scans.

[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 a larger diameter.
Although efforts have been made to expand it, it has not yet achieved sufficient results. 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-sized picture tubes to obtain a high-resolution large screen has hitherto been 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 portion of the screen becomes a fatal defect.

In contrast, US Pat. No. 3,071,7
No. 06 specification, Japanese Utility Model Publication No. 39-25641, Japanese Patent Publication No. 42-4929 and Japanese Patent Publication No. 50-17167 disclose a structure in which a plurality of independent picture tube cleans are integrated. Has been done. The picture tube having the phosphor screen of this integrated structure is composed of a face plate on which the phosphor screen is formed, a rear plate opposed to the face plate, a plurality of funnels adjacent to the rear plate and each funnel. A vacuum envelope is formed by the plurality of necks provided. The face plate is made of glass and the rear plate is made of glass or metal.

However, in such a structure, when the screen surface becomes large, the face plate and the rear plate must be thickened so that they can withstand the load of atmospheric pressure (external pressure), and the tube shaft must be thick. It is also necessary to have a large curvature in the direction. As a result, the weight of the envelope becomes very heavy, and if it has a large curvature in the tube axis direction,
The screen becomes difficult to see. Furthermore, the distance between the phosphor screen and the electron gun enclosed in the neck becomes large, and the electron lens becomes unfavorable in terms of magnification.

As a cathode ray tube which solves such a problem, the present inventors have developed a cathode ray tube (color picture tube) shown in FIGS. 3 and 4. This cathode ray tube has a substantially rectangular flat face plate 1 and a substantially rectangular flat rear plate that faces the face plate 1 in parallel via a substantially vertically extending side wall 2 joined to the peripheral portion of the face plate 1. plate
3, a vacuum envelope 6 made up of a plurality of funnels 5 joined separately around each of a plurality of openings 4 formed in the rear plate 3, and formed on the inner surface of the face plate 1. The phosphor screen 7 is divided into a plurality of regions through the shadow mask 10 by the electron beam emitted from the electron gun 9 arranged in the neck 8 of each funnel 5,
For example, as shown in FIG. 3, the color screen is divided into five in the horizontal direction and four in the vertical direction, and each region R1 to R20 is horizontally and vertically scanned to display one color image on the entire surface of the phosphor screen 7. Is formed into a structure.

In this cathode ray tube, a support column 11 is arranged between the face plate 1 and the rear plate 3 to support the atmospheric pressure load applied to the face plate 1 and the rear plate 3. Further, the shadow mask 10 is a plurality of mask erection means fixed to the inner surface of the rear plate 3.
It is attached to 12 and faces the phosphor screen 7 at a predetermined interval.

In such a cathode ray tube, one electron gun 9
This electron gun 9 and the scanning area of the electron beam emitted from
It is necessary that the scanning area of the electron beam emitted from the electron gun 9 adjacent to the contact area be in close contact with each other without overlapping, and for that purpose, the electron beam scanning each scanning area is horizontal on the shadow mask 10. It is necessary to perform overscan in both the direction (X-axis direction) and the vertical direction (Y-axis direction) and regulate the scanning area by the effective portion of the shadow mask 10 in which a large number of electron beam passage holes are formed. However, when overscanning is performed as described above, the overscanning electron beam passes through the outside of the corresponding effective surface to land in a region other than the predetermined scanning region, and as a result of unnecessary light emission, a good image is obtained. Will not be obtained.

Although a means for preventing unnecessary light emission due to this overscan has been already developed, a sufficient means has not been obtained yet.

Further, since the plurality of mask erection means 12 in the cathode ray tube are arranged in parallel in the horizontal direction,
The shadow mask 10 is fixed with a sufficient tension applied in the horizontal direction, but the tension is insufficient in the vertical direction, and the shadow mask 10 is loosened by its own weight, resulting in a phosphor screen.
There is a problem that the interval (q value) from 7 and the landing shift occur.

[0011]

As described above, in a cathode ray tube in which a phosphor screen is divided into a plurality of regions and scanned by an electron beam emitted from a plurality of electron guns, the resolution is short and the depth is short. However, there are various problems when trying to obtain a cathode ray tube having a simple structure with an easy-to-see screen.

The present inventors have previously proposed, as a cathode ray tube capable of solving these problems, a substantially rectangular flat face plate and a substantially vertically extending side wall joined to the peripheral portion thereof. Fluorescence formed on the inner surface of the face plate, which has a substantially rectangular flat rear plate facing in parallel with the face plate through the vacuum plate, and a vacuum envelope composed of a plurality of funnels joined to the rear plate. A body screen is divided into a plurality of regions by an electron beam emitted from an electron gun disposed in the neck of each funnel, and is horizontally and vertically scanned to display a color image. Developed a cathode ray tube. In this cathode ray tube, the shadow mask is attached to a plurality of mask erection means fixed to the inner surface of the rear plate so as to face the phosphor screen at a predetermined interval.

In such a cathode ray tube, the scanning region of the electron beam emitted from one electron gun and the scanning region of the electron beam emitted from the electron gun adjacent to this electron gun are in close contact with each other without overlapping. It is necessary to do so, and the electron beam that scans each scan region overscans both horizontally and vertically on the shadow mask,
It is necessary to regulate the scanning area by the effective portion of the shadow mask in which a large number of electron beam passage holes are formed. However, when overscanning as described above, the overscanning electron beam passes outside the corresponding effective surface,
Landing on an area other than the predetermined scanning area and resulting unnecessary light emission make it impossible to obtain a good image. Further, since the plurality of mask erection means in the cathode ray tube are arranged in parallel in the horizontal direction, the shadow mask is fixed in a state where sufficient tension is applied in the horizontal direction, but tension is applied in the vertical direction. However, there is a problem that the shadow mask is slackened by its own weight, and the gap between the shadow mask and the phosphor screen shifts, resulting in a landing shift.

The present invention has been made in order to solve the above-mentioned problems, and prevents unnecessary light emission caused by overlap of scanning areas with respect to the phosphor screen and overscanning, and prevents landing deviation due to looseness of the shadow mask. It is an object of the present invention to provide a cathode ray tube which displays an image of good quality without using it.

[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 second flat plate having a substantially rectangular shape facing the first plate in parallel with the side wall through the side wall; Then, the phosphor screen formed on the inner surface of the first plate is divided into a plurality of regions by the electron beam emitted from the beam emission means arranged on the second plate side, and the cathode ray tube is scanned. A partition plate is provided on the inner surface of the plate, the partition plate having a plurality of apertures for restricting scanning of electron beams with respect to a plurality of regions, and a mask portion facing the phosphor screen at a predetermined distance is closely attached to the partition plate. It was attached to a mask erection means fixed to the inner surface of the second plate.

[0016]

As described above, the partition plate having the plurality of apertures for restricting the scanning of the electron beam with respect to the plurality of regions is arranged on the inner surface of the second plate and faces the phosphor screen at a predetermined distance. When the mask portion to be attached is brought into close contact with the partition plate and attached to the mask erection means fixed to the inner surface of the second plate, the electron beam does not interfere with the mask even when overscanning in order to bring the plurality of scanning regions into close contact without overlapping. Can be regulated by a partition plate in front of the unit, the overscanned electron beam can be prevented from reaching the phosphor screen, and unnecessary light emission caused by the overscanned electron beam can be prevented. . Further, by bringing the mask portion into close contact with the partition plate, the mask portion is prevented from being loosened, and the distance between the phosphor screen and the mask portion can be set with high accuracy.

[0017]

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

1 and 2 show a cathode ray tube which is an embodiment of the present invention. This cathode ray tube comprises a substantially rectangular flat face plate 1 (first plate), a substantially vertically extending side wall 2 joined to the peripheral portion thereof, and a side wall 2 thereof.
A substantially rectangular flat rear plate 3 (second plate) that faces in parallel with the face plate 1 through a plurality of openings 4 formed in the rear plate 3; Vacuum envelope consisting of 5 funnels
Have 6 On the inner surface of the face plate 1, a striped light absorption layer which is elongated in the vertical direction is formed over almost the entire surface, and stripe-shaped phosphor layers which emit blue, green and red are provided in the gaps of the light absorption layer. The formed phosphor screen 7 is provided inside the shadow mask 10 so as to face the phosphor screen 7 and be separated by a predetermined distance.
(Mask portion) is arranged. On the other hand, in each neck 8 of the plurality of funnels 5, the electron gun 9 (beam emitting means)
Is provided.

Then, the electron beam emitted from each electron gun 9 is deflected by horizontal and vertical deflection magnetic fields generated by a deflection yoke (not shown) mounted outside each funnel 5, and passes through a shadow mask 10. The phosphor screen 7 is divided into a plurality of regions in the horizontal and vertical directions, for example, 5 in the horizontal direction and 4 in the vertical direction.
Scanning is performed by dividing into individual regions (see FIG. 3). The images drawn on the phosphor screen 7 by this divided scanning are connected by the signals applied to the electron guns 9 and the deflection yokes, and one large color image is drawn on the entire surface of the phosphor screen 7.

In such a cathode ray tube, the shadow mask 7 has a plurality of electron beam passage holes through which electron beams emitted from the electron guns 9 arranged in the necks 8 of the funnels 5 pass. Is formed in a structure having an effective portion 20 and an ineffective portion 21 in which an electron beam passage hole is not formed between the effective portion 20 and the adjacent effective portion 20.

On the other hand, on the inner surface of the rear plate 3, a plurality of fixing parts 22 are fixed in the horizontal direction along both ends in the vertical direction, and a plurality of mask erection means 23 are respectively fixed to the fixing parts 22.
Installed on.

Further, in the cathode ray tube of this example, a partition plate 26 is formed on the inner surface of the rear plate 3 in which a plurality of openings 25 to be described later are formed corresponding to each effective portion 20 of the shadow mask 10. Has been done. In the shadow mask 10 attached to the mask erection means 23, each effective portion 20 is a partition plate.
The openings 26 are combined with each other in a matching relationship with each other, and the rear surface of the opening 26 is in close contact with the partition plate 26 and is kept at a predetermined distance from the phosphor screen 7.

In this cathode ray tube, a support column 28 (support means) for supporting an atmospheric pressure load applied to the flat face plate 1 and the rear plate 3 is attached between the openings 25 of the partition plate 26. The support column 28 is made of a metal round bar or the like having a flat edge portion formed at the tip, penetrates the ineffective portion 21 of the shadow mask 10, and the edge portion of the tip is a scanning area in which the division scanning is performed. Is in contact with the stripe-shaped light absorption layer located on the boundary of. The longitudinal direction of the edge portion of the support column 28 that is in contact with the striped light absorbing layer coincides with the longitudinal direction of the light absorbing layer.

By the way, in a cathode ray tube which displays a single image by dividing a phosphor screen into a plurality of scanning regions and scanning, an electron beam emitted from each electron gun is overscanned as described above. It is necessary to regulate so that the overscanned electron beam does not scan other scanning areas. On the other hand, in the cathode ray tube of this example, the apertures 25 of the partition plate 26 arranged corresponding to the effective portion 20 of the shadow mask 10 are made smaller, and the partition plate 26 is made smaller.
The apertures 25 regulate the overscanned electron beam so that the electron beam that has passed through the effective portion 20 of the shadow mask 10 does not scan other scanning regions. In other words, in the cathode ray tube of this example, since the scanning areas of the phosphor screen 7 are connected without overlapping, even if the electron beam emitted from the electron gun 9 is overscanned, the overscanned electron beam is a shadow mask. Ten
The electron beam that hits the partition plate 26 before passing through the effective portion 20 of the above and passes through the effective portion 20 of the shadow mask 10 scans only the divided areas of the corresponding phosphor screen 7 and does not land the other divided areas. It is like this.

Therefore, when the partition plate 26 is arranged on the inner surface of the rear plate 3 and the shadow mask 10 is arranged in close contact with the partition plate 26 as described above, the overscanned electron beam lands another scanning region. It is possible to prevent unnecessary light emission caused by this. Further, since the shadow mask 10 is in close contact with the partition plate 26, the slack of the shadow mask 10 is eliminated, and the landing displacement caused by the slack of the shadow mask 7 can be prevented, and a cathode ray tube that displays a good-quality image. Can be

[0026]

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 is provided. A plurality of phosphor screens are formed on the inner surface of the first plate by electron beams emitted from the beam emission means arranged on the second plate side. In a cathode ray tube that divides into two regions and scans, a partition plate having a plurality of apertures for restricting scanning of electron beams in a plurality of regions is arranged on the inner surface of the second plate, and is separated from the phosphor screen by a predetermined distance. Then, when the mask portions facing each other are brought into close contact with this partition plate and attached to the mask erection means fixed to the inner surface of the second plate, the plurality of scanning regions are brought into close contact with each other without overlapping. Even when scanned, the electron beam can be regulated by the partition plate in front of the mask to prevent the overscanned electron beam from reaching the phosphor screen, and unnecessary light emission caused by the overscanned electron beam Can be prevented. In addition, the mask portion is prevented from being loosened by closely contacting the mask portion with the partition plate, the interval between the phosphor screen and the mask portion can be set with high accuracy, and the landing deviation due to the looseness of the mask portion is eliminated, The cathode ray tube can display an image of good quality.

[Brief description of drawings]

FIG. 1 is an exploded view showing a main configuration of a cathode ray tube which is an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a configuration of the cathode ray tube.

FIG. 3 is a perspective view showing a configuration of a cathode ray tube according to a prior application in which a phosphor screen adhered and formed on an inner surface of a flat face plate is divided into a plurality of scanning regions and scanned.

FIG. 4 is a cross-sectional view showing a main part thereof.

[Explanation of symbols]

 1 ... Face plate (1st plate) 2 ... Side wall 3 ... Rear plate (2nd plate) 4 ... Open hole 5 ... Funnel 6 ... Vacuum envelope 7 ... Phosphor screen 8 ... Neck 9 ... Electron gun 10 ... Shadow mask (Mask part) 20 ... Effective part 21 ... Ineffective part 22 ... Fixed part 23 ... Mask installation means 25 ... Opening hole 26 ... Partition plate 28 ... Supporting pillar

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Eiji Kambara 1-2-9 Harara-cho, Fukaya-shi, Saitama Stock company 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, a phosphor screen formed on the inner surface of the first plate, and arranged on the second plate side, and dividing the phosphor screen into a plurality of regions. Beam emitting means for emitting a scanning electron beam; a partition plate disposed on the inner surface of the second plate and having a plurality of apertures for restricting the scanning of the electron beam with respect to the plurality of regions; 2 a mask erection means fixed to the inner surface of the plate, and a mask portion attached to the mask erection means and closely contacting the partition plate and facing the phosphor screen at a predetermined distance. Cathode ray tube characterized by Bei.