JPH0729523A - Picture tube device - Google Patents

Abstract

PURPOSE:To restrain the whole deflecting electric power to the practicable magnitude by making plural regions longitudinally long in the vertical direction when a phosphor screen is scanned dividedly in the plural regions by an electron beam. CONSTITUTION:A beam from an electron gun 14 in a neck 13 of a funnel 4 is deflected in the horizontal and vertical directions on the outside of the funnel by a preliminary deflecting magnetic field and a main deflecting magnetic field. A phosphor screen 8 is scanned dividedly in the horizontal and vertical directions in regions R1 to R24 corresponding to electron guns through a shadow mask 9. Colors are switched to/from each other with every single horizontal and vertical scanning. Lusters depicted on the screen 8 are continued to each other by signals to the electron guns or respective deflecting devices, and a single large seamless luster is depicted on the whole surface of the screen 8. The regions R1 to R24 are made longitudinally long respectively in the vertical direction. Thereby, deflecting electric power in the longitudinally long regions can be reduced, and deflecting electric power of the whole picture tube device can be restrained to the practicable magnitude. Since a horizontal directional deflection angle is small, an electron beam can be made to reach a prescribed phosphor layer easily.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a picture tube apparatus such as a color picture tube apparatus, and more particularly to a picture tube apparatus which divides a phosphor screen into a plurality of areas for scanning.

[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, a means for arranging a plurality of independent small-sized picture tube devices to obtain a high-resolution large screen has been disclosed in Japanese Patent Laid-Open Nos. 48-90428 and 49-21019.
It is disclosed in, for example, Japanese Utility Model Publication No. 53-117130. This kind of method is effective for displaying a huge screen with a large number of divisions arranged outdoors, but the screen size is 4
In the case of a medium-scale large screen display of about 0 inch, the connection portion of the screen between the areas 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
In the specification No. 06, Japanese Utility Model Publication No. 39-25641, Japanese Patent Publication No. 42-4928, and Japanese Patent Publication No. 50-17167, a plurality of independent phosphor screens of picture tubes are integrated and integrated. A multi-neck type picture tube device is disclosed in which a structured phosphor screen is divided into a plurality of regions and scanned by each electron beam emitted from each electron gun disposed in each of a plurality of necks. . The multi-neck type picture tube device having the phosphor screen of this integrated structure has a curved screen surface, which is different from the above-mentioned means for arranging a plurality of independent small picture tube devices to form a large screen. There is no screen connection between the divided areas, and a screen that is fairly easy to see can be obtained.

Further, Japanese Patent Application No. 5-36363 discloses a multi-neck type picture tube device having a phosphor screen having an integrated structure in which the screen surface is flat.

This picture tube device having a flat screen surface is
Compared with the picture tube device in which the screen surface is a curved surface, external light is less reflected on the screen surface, and therefore the image reproduced on the screen surface is easier to see. Further, there are advantages that the distance from the electron gun disposed in the neck to the phosphor screen is short, the electron lens is favorably magnified, and a high-resolution image can be obtained.

However, in a multi-neck type picture tube device which divides into a plurality of regions and scans by each electron beam emitted from the electron guns arranged in a plurality of necks, it corresponds to each electron gun. Therefore, a plurality of deflecting devices are required for each, so that the picture tube device as a whole has substantially one electron gun.
A very large deflection power is required as compared with the ordinary individual picture tube device. Therefore, it becomes difficult to design a practical drive circuit. There is a possibility of heat generation and ignition of the deflection device and drive circuit. There are economic problems such as high power consumption.

Further, in the color picture tube device having the shadow mask facing the phosphor screen, the electron beams deflected by the deflecting device are selected by the shadow mask and landed on the three-color phosphor layer of the phosphor screen. As the trajectory of the electron beam becomes more complicated, it becomes more difficult to design and manufacture the system including the shadow mask-phosphor screen, and the electron beam does not land correctly on a predetermined phosphor layer, resulting in mislanding.

[0010]

As described above, the multi-neck system in which the phosphor screen having the integrated structure is divided and scanned by each electron beam emitted from the electron guns arranged in the plurality of necks. The CRT device requires a plurality of deflecting devices corresponding to a plurality of electron guns, so that the entire CRT device requires much larger deflection power than a normal CRT device, which is not practical. It becomes difficult to design a simple drive circuit. There is a possibility of heat generation and ignition of the deflection device and drive circuit. There are economic problems such as high power consumption.
Further, in the color picture tube device in which the shadow mask is arranged facing the phosphor screen, the electron beams deflected by the deflecting device are selected by the shadow mask and landed on the three-color phosphor layer of the phosphor screen.
The more complicated the trajectory of the electron beam, the more shadow mask-
The system including the phosphor screen is difficult to design and manufacture, and the electron beam does not land correctly on a predetermined phosphor layer. The present invention has been made to solve the above problems, and deflects electron beams emitted from a plurality of electron guns by a plurality of deflecting devices,
In a picture tube device that divides and scans a phosphor screen, by reducing the deflection power of each deflecting device, it is possible to reduce the deflection power of the entire picture tube device. An object of the present invention is to enable an electron beam emitted from a gun to be easily landed correctly on a predetermined phosphor layer.

[0011]

An electron beam emitted from a plurality of separately arranged electron guns is deflected by a plurality of deflecting devices, and the phosphor screen is horizontally and vertically deflected by the deflected electron beams. In a picture tube device that divides and scans a plurality of regions in the direction, the plurality of regions includes a vertically long region that is longer in the vertical direction than in the horizontal direction.

[0012]

As described above, the plurality of regions which are divided and scanned by the electron beams emitted from the plurality of electron guns are
If the configuration includes a vertically long region that is longer in the vertical direction than in the horizontal direction, the horizontal deflection angle of the deflection device with respect to the electron beam that scans the vertically long region is smaller than the vertical deflection angle. On the other hand, the horizontal deflection frequency of the deflection device is generally about 260 times higher than the vertical deflection frequency, and most of the deflection power is consumed by the horizontal deflection. In addition, the deflection power becomes sin (θ / 2) when the deflection angle θ increases.
Becomes larger in proportion to, for example, the deflection angle in the horizontal direction is 1
At / 2, the deflection power is reduced to 1/3. Therefore, in a picture tube device that divides and scans the phosphor screen into a plurality of areas, if the area is vertically long, the deflection power of the entire picture tube device can be suppressed to a practical level.

When the horizontal deflection angle is large, the trajectory of the electron beam becomes complicated due to raster distortion and convergence adjustment, and it becomes difficult to land correctly on a predetermined phosphor layer. However, the horizontal deflection angle is small. Then, the deflection aberration is reduced, raster distortion and misconvergence can be reduced, and the trajectory of the electron beam can be prevented from becoming complicated. Therefore, the electron beam can be easily landed correctly on the predetermined phosphor layer.

[0014]

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

FIG. 1 shows a color picture tube device which is one embodiment of the present invention, and FIG. 2 shows the structure thereof in an exploded manner. This color picture tube device includes a substantially rectangular flat glass face plate 1, a side wall 2 that is joined to a peripheral portion of the face plate 1 and extends substantially perpendicularly to the face plate 1, A vacuum envelope including a substantially rectangular flat glass rear plate 3 which is joined to face plate 1 in parallel with each other via a side wall 2, and a plurality of funnels 4 which are joined to the rear plate 3. Have 5.
The plurality of funnels 4 are joined around a plurality of openings 6 formed in the rear plate 3, and in the illustrated example,
8 in the horizontal direction (X direction), 3 in the vertical direction (Y direction)
A total of 24 funnels 4 are joined together.

On the inner surface of the face plate 1, blue,
A single phosphor screen having an integral structure consisting of vertically striped three-color phosphor layers that emit green and red light and a black stripe made of a light-absorbing material provided between the three-color phosphor layers. 8 is formed. A shadow mask 9 is arranged inside the phosphor screen 8 so as to face the phosphor screen 8. In this shadow mask 9, a portion corresponding to a plurality of areas R1 to R24 which are horizontally and vertically divided and scanned by an electron beam is used as an effective portion in which a large number of electron beam passage holes are formed, as described later. ,
Although they are connected in the vertical direction, they are divided in the horizontal direction into a number corresponding to the number of divisions of the above-mentioned horizontal region (eight in the illustrated example divided into eight in the horizontal direction). Then, each of the divided shadow masks is fixed in a state in which tension is applied to a pair of metal first mask erection members 10 having a U-shaped cross section, which are fixed by frit glass to both ends in the vertical direction of the rear plate 3, respectively. And is lifted in the direction of the phosphor screen 8 by the plurality of metallic second mask erection members 11 fixed by frit glass to the inside of the first mask erection member 10 and the vertical middle portion of the rear plate 3. First and second mask construction members 10, 1
1 holds the phosphor screen 8 at a predetermined interval with high precision.

When the shadow mask 9 is divided in the horizontal direction in this way, even if heat is generated due to the impact of the electron beam, the heat is not transmitted to the divided adjacent shadow masks.
It is possible to prevent the purity drift due to the thermal expansion of the shadow mask that occurs in the conventional color picture tube device. It should be noted that although connected in the vertical direction, the three-color phosphor layer of the phosphor screen 8 is formed in a stripe shape that is long in the vertical direction in the vertical direction, and thus is affected by the thermal expansion of the shadow mask. Absent.

Inside the neck 13 of each funnel 4, an electron gun 14 for emitting a single electron beam is arranged. Further, on the outside of each funnel 4, a pre-deflection for generating a pre-deflection magnetic field for pre-deflecting the electron beam emitted from the electron gun 14 disposed in each neck 13 to substantially 3 electron beams. A deflection section is provided which comprises a device (not shown) and a main deflection device (not shown) which generates a main deflection magnetic field for further deflecting the electron beam pre-deflected by the pre-deflection device.

A metal columnar support member (not shown) is arranged between the face plate 1 and the rear plate 3 to support the atmospheric pressure load applied to the flat face plate 1 and the rear plate 3. ing. This support member has a wedge-shaped tip portion that abuts on the phosphor screen 8, is arranged such that the length direction thereof coincides with the length direction of the black stripe of the phosphor screen 8, and penetrates the shadow mask 9. It is fixed to the rear plate 3 by frit glass.

In this color cathode ray tube device, the electron beam emitted from the electron gun 14 arranged in each neck 13 of the funnel 4 is preliminarily generated by a pre-deflection device mounted outside the funnel 4. The electron beam is pre-deflected in the horizontal direction by the deflection magnetic field to form three electron beams having different positions on the deflection center plane of the main deflection device, and the pre-deflected electron beam is horizontally and vertically aligned by the main deflection magnetic field generated by the main deflection device. Then, the phosphor screen 8 is deflected in the horizontal direction and divided into a plurality of regions corresponding to the electron gun 14 in the horizontal and vertical directions through the shadow mask 9 and scanned. That is, in the illustrated example, scanning is performed by dividing into 24 regions R1 to R24 which are divided into eight in the horizontal direction and three in the vertical direction. Then, the color is switched every horizontal and vertical scanning. The rasters drawn on the phosphor screen 8 by this divided scanning are connected by the signals applied to the electron gun 14 and each deflecting device, and one large raster without a break is drawn on the entire surface of the phosphor screen 8.

In particular, in this color picture tube device, a plurality of regions R1 to R24 which are divided and scanned by the electron beams emitted from the plurality of electron guns 14 are vertically longer than the horizontal direction, respectively. Has become.

For example, for an effective portion of the phosphor screen 8, that is, the size of the screen is 664 mm in the horizontal direction and 373.8 mm in the vertical direction, a phosphor screen equivalent to a 32-inch tube has a horizontal direction of 83 mm and a vertical direction. 124.6
The scanning is divided into 24 areas R1 to R24 of mm. As shown in FIG. 3, the deflection center O is set so that the diagonal deflection angle .theta.D is 50.degree. For each of the regions R (R1 to R24), and the horizontal deflection angle is 29. 0 °,
The deflection angle in the vertical direction is 42.4 °. As a result, in this color picture tube device, the depth, that is, the distance from the neck end to the face plate 1 is 220 mm, which is extremely short.

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

That is, in advance, the face plate 1
The phosphor screen 8 is formed on the inner surface of the. On the other hand, frit glass is coated and sintered with first and second mask erection members 10 and 11 at predetermined positions on the inner surface of the rear plate 3, and columnar support members for supporting an atmospheric pressure load applied to the face plate 1 and the rear plate 3. Fixed by.
Then, the shadow mask 9 is welded while being tensioned by the first mask erection member 10. Also each funnel 4
The electron gun 14 is sealed in the neck 13 of the. The face plate 1 on which the phosphor screen 8 is formed, the rear plate 3 on which the pillar-shaped supporting member is fixed and the shadow mask 9 is installed, the funnel 4 and the side wall 2 in which the electron gun 14 is sealed are brought into a predetermined relationship. Positioning positioning,
These are joined together by frit glass. Then, it is manufactured by exhausting the envelope 5 assembled as one body.

As a method of manufacturing this color cathode ray tube device, in addition to the above, the funnel 4 may be joined to the rear plate 3 and then the electron gun 14 may be sealed in the neck 13 of the rear plate 3, or the side wall 2 may be formed beforehand. It may be joined to the face plate 1 or the rear plate 3, or after the first mask erection member 10 is fixed to the rear plate 3 and the shadow mask 9 is attached to the first mask erection member 10, the rear plate 3 is first It can be manufactured by various other methods such as fixing the two-mask erection member 11.

By the way, the plurality of regions R1 to R24 which are divided and scanned by the electron beams emitted from the plurality of electron guns 14 separately arranged as described above are long in the vertical direction with respect to the horizontal direction. When it is vertically long, the deflection power of the entire color picture tube device can be reduced to a practical size. Further, the raster distortion and misconvergence can be reduced, and the electron beam can be easily landed correctly on the predetermined phosphor layer.

That is, as for the deflection power, in general, the reactive power is much larger than the resistance loss in the horizontal deflection, so that it is sufficient to consider the inductance component. On the other hand, in the vertical deflection, the reactive power is conversely because the frequency is low. The resistance loss is larger than that, and the inductance can be ignored. Moreover, the resistance loss is 1/20 to 1/1 / of the inductance.
Since the deflection power is 40, the deflection power in the horizontal direction having a high frequency may be considered.

Since the inductance of the horizontal deflection is proportional to sin (θ / 2) with respect to the deflection angle θ, for example, as shown in FIG. 4, six phosphor screens 8 are arranged horizontally and six phosphor screens 8 are arranged vertically. A total of 24 areas R1 to R24 are divided into four areas, each of which has a horizontal length of 11
Assuming that the shape is 0.7 mm and the length in the vertical direction is 93.5 mm, the deflection angle in the horizontal direction is 39.2 °, and sin (θ / 2) is the color picture tube device of the above example. It is about twice as large as that of. This means that the deflection power can be reduced to about ½ by making the divided areas vertically long as shown in FIG. 1 rather than making the divided areas substantially square as shown in FIG. Therefore, as in the color picture tube device of this example, by vertically dividing a plurality of regions and scanning, the deflection power can be greatly reduced and the size can be made practical.

Further, in the color picture tube device, the deflected electron beam is landed on a predetermined phosphor layer of the phosphor screen through the electron beam passage hole of the shadow mask, but the phosphor layer is formed from a vertically elongated stripe. In this color picture tube device, even if the trajectory of the electron beam deviates in the vertical direction, color misregistration due to mislanding does not occur. However, as shown in FIG. 5, if the trajectory 18 of the electron beam shifts in the horizontal direction, it will not land correctly on the predetermined phosphor layer. For example, as shown by the broken line, the blue phosphor layer 26B
When the orbit 25 of the electron beam landing at 1 shifts in the horizontal direction as shown by the solid line, it will start landing on the green phosphor layer 26G, causing a color shift. This mislanding occurs due to a change in the distance between the phosphor screen 8 and the shadow mask 9 and the effect of the electromagnetic field on the electron beam, and is greater as the horizontal deflection angle increases.

That is, when the horizontal deflection angle is large,
The width (horizontal length) of the shadow mask also increases,
The shadow mask is not only vulnerable to thermal fluctuations and mechanical vibrations, but also becomes longer in the trajectory of the deflected electron beam and is easily affected by the external electromagnetic field. Further, when the horizontal deflection angle is large, the electron beam is incident on the shadow mask or the phosphor screen at a large inclination angle. Therefore, even with a slight change in the incident angle, the position of the electron beam on the phosphor screen changes significantly, and mislanding easily occurs. Further, the orbit of the electron beam becomes complicated due to the raster distortion and the convergence adjustment caused by the large deflection angle, and the phosphor layers 19B, 19G, 1
Accurate landing becomes difficult for 9R.

However, like the color picture tube device of this example, if each of the divided areas is vertically long with respect to the horizontal direction, the deflection angle in the horizontal direction can be reduced,
It is possible to solve the problem that occurs when the horizontal deflection angle is large.

In the above embodiment, the case where the phosphor screen is divided into eight in the horizontal direction and three in the vertical direction for a total of 24 scans has been described. It may be vertically long, and is not limited to the number of divided regions in the above-described embodiment.

Further, it is not necessary to make all the divided regions vertically long. Also, the size of the divided areas does not have to be constant.

In the above embodiment, the deflection angle of the divided area is 50 °, but the deflection angle of this divided area is
Even if the angle is 70 °, 90 °, 110 °, etc., it is possible to obtain a color picture tube device with the same effect.

In the above embodiment, the face plate and the rear plate of the envelope are flat, and the supporting member is arranged inside the envelope to support the atmospheric pressure load of the flat face plate and the rear plate. Although the color picture tube apparatus described above has been described, the present invention can also be applied to a color picture tube apparatus in which the face plate has a curvature and a support member for supporting an atmospheric pressure load is unnecessary.

The member for constructing the shadow mask may be one other than that of the above-mentioned embodiment, and the method for constructing the shadow mask may be another method such as the one for the side wall of the envelope.

Further, in the above-mentioned embodiment, the case where the electron beam emitted from each electron gun is deflected by the deflecting device for generating the magnetic field has been described.
The electrostatic deflection may be used, or the preliminary deflection and the main deflection by the preliminary deflection device and the main deflection device may be performed by a combination of the electromagnetic deflection and the electrostatic deflection.

Although the above embodiment has been described with respect to the color picture tube device, the present invention can be applied to other black and white picture tube devices.

[0039]

EFFECTS OF THE INVENTION Electron beams emitted from a plurality of separately arranged electron guns are deflected by a plurality of deflecting devices, and a plurality of phosphor screens are horizontally and vertically aligned by the deflected electron beams. In a picture tube device that divides into a plurality of regions and scans, if a plurality of regions are configured to include a vertically long region that is longer in the vertical direction than the horizontal direction, the horizontal direction of the deflecting device for the electron beam that scans this vertically long region The deflection angle is smaller than the vertical deflection angle. As a result, most of the deflection power is consumed by the horizontal deflection, so that the deflection power in the vertically long region can be reduced, and the deflection power of the entire picture tube device can be suppressed to a practical level. Like

If the horizontal deflection angle is large, the trajectory of the electron beam becomes complicated due to raster distortion and convergence adjustment, and it becomes difficult to land correctly on a predetermined phosphor layer. However, the horizontal deflection angle is small. Then, the deflection aberration is reduced, the raster distortion and the misconvergence can be reduced, and the trajectory of the electron beam can be prevented from becoming complicated. Therefore, it is possible to provide a highly practical color picture tube device in which the electron beam can be easily landed correctly on the predetermined phosphor layer.

[Brief description of drawings]

FIG. 1 (a) is a diagram for explaining the configuration of a color picture tube device which is an embodiment of the present invention, and FIG. 1 (b) is a BB sectional view thereof.

FIG. 2 is an exploded perspective view for explaining the configuration of the color picture tube device.

FIG. 3 is a diagram for explaining a main configuration of the color picture tube device.

FIG. 4 is a diagram showing a case where a divided area shown for comparison with the color picture tube device is a square shape.

FIG. 5 is a diagram for explaining mislanding with respect to a phosphor screen including a phosphor layer having a striped stripe shape extending in the vertical direction.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Face plate 3 ... Funnel 8 ... Phosphor screen 9 ... Shadow mask 14 ... Electron gun 19B, 19G, 19R ... 3-color phosphor layer O ... Deflection center R1 to R24 ... Region

Claims (1)

[Claims] 1. An electron gun unit in which a plurality of electron guns are separately arranged, and a plurality of deflecting devices arranged corresponding to each of the electron guns and deflecting an electron beam emitted from each of the electron guns. And a phosphor screen divided into a plurality of regions in the horizontal and vertical directions and scanned by the electron beams deflected by the respective deflecting devices. Is a picture tube device including a vertically long region that is longer in the vertical direction than in the horizontal direction.