JP3178943B2 - Picture tube device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a picture tube device such as a color picture tube device and, more particularly, to a picture tube device 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 a high-definition picture tube having a high-definition broadcast or a large screen associated therewith. Generally, in order to achieve high resolution of a picture tube, the spot diameter of an electron beam on a phosphor screen must be reduced.

[0003] On the other hand, conventionally, an attempt has been made to improve the electrode structure of an electron gun or to enlarge and extend the diameter of the electron gun itself, but no satisfactory results have yet been obtained. The biggest cause of this is that the distance from the electron gun to the phosphor screen becomes longer as the tube becomes larger, and the magnification of the electron lens becomes too large. Therefore, it is important to reduce the distance (depth) from the electron gun to the phosphor screen in order to realize high resolution. In this case, wide-angle deflection increases the magnification difference between the center and the periphery of the screen. For this reason, wide-angle deflection is not advantageous for achieving high resolution.

For this reason, conventional means for providing a plurality of independent small picture tube devices to provide a large screen with a high resolution are disclosed in Japanese Patent Application Laid-Open Nos. 48-90428 and 49-21019.
And Japanese Unexamined Utility Model Publication No. 53-117130. This type of method is effective for displaying a huge screen with a large number of divisions arranged outdoors or the like.
In the case of a medium-sized large-screen display of about 0 inch, a connection portion of the screen between the regions is conspicuous, and an unsightly image is reproduced. Therefore, when used as a home television receiver or when used as a terminal for graphic display in computer-aided design (CAD), the connection part of the screen becomes a fatal defect.

On the other hand, US Pat. No. 3,071,7.
No. 06, JP-B-39-25641, JP-B-42-4928, JP-B-50-17167, etc., integrate a plurality of independent phosphor screens of a picture tube and integrate them. A multi-neck picture tube device is disclosed in which a phosphor screen having a structure is divided into a plurality of regions and scanned by electron beams emitted from electron guns respectively disposed in a plurality of necks. . In the multi-neck picture tube device having the phosphor screen of the integrated structure, the screen surface is formed of a curved surface, but unlike the above-described means for arranging a plurality of independent small picture tube devices to form a large screen, There is no connection of the screen between the divided areas, and a screen that is fairly easy to see can be obtained.

Japanese Patent Application No. 5-36363 discloses a multi-neck picture tube device having a phosphor screen of an integrated structure with a particularly flat screen surface.

This picture tube device having a flat screen surface is:
Compared with the picture tube device having a curved screen surface, reflection of external light on the screen surface is small, and therefore, an image reproduced on the screen surface is easy to see. In addition, there is an advantage that the distance from the electron gun disposed in the neck to the phosphor screen is short, the electron lens is preferable in magnification, and a high-resolution image can be obtained.

However, in a multi-neck picture tube apparatus which scans by dividing into a plurality of regions by each electron beam emitted from an electron gun disposed in a plurality of necks, each electron gun corresponds to the electron gun. Therefore, since a plurality of deflection devices are required, the electron gun is substantially one in the picture tube device as a whole.
An extremely large deflection power is required as compared with a normal picture tube device. Therefore, it becomes difficult to design a practical drive circuit. There is a possibility that the deflection device or the drive circuit may generate heat or fire. There is an economic problem such as high power consumption.

In a color picture tube device having a shadow mask opposed to the phosphor screen, the electron beam deflected by the deflecting device is selected by the shadow mask and is 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 a system including a shadow mask-phosphor screen, and the electron beam does not land properly on a predetermined phosphor layer, causing a problem of mislanding.

[0010]

As described above, a multi-neck system in which an integrated phosphor screen is divided and scanned by each electron beam emitted from an electron gun disposed in a plurality of necks. The picture tube device requires a plurality of deflection devices corresponding to a plurality of electron guns, so that the picture tube device as a whole requires a much larger deflection power than a normal picture tube device, and It becomes difficult to design a suitable driving circuit. There is a possibility that the deflection device or the drive circuit may generate heat or fire. There is an economic problem such as high power consumption.
Further, in a color picture tube device in which a shadow mask is arranged opposite to the phosphor screen, an electron beam deflected by the deflecting device is 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 the shadow mask
It is difficult to design and manufacture a system including a phosphor screen, and there is a problem that an electron beam does not land properly on a predetermined phosphor layer. The present invention has been made to solve the above problems, and deflects an electron beam emitted from a plurality of electron guns by a plurality of deflection devices.
In a picture tube device that scans by dividing the phosphor screen, the deflection power of each deflection device can be reduced 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 easily land correctly on a predetermined phosphor layer.

[0011]

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

[0012]

As described above, a plurality of regions scanned by being divided by electron beams emitted from a plurality of electron guns are
When a structure including a vertically long region longer in the vertical direction than in the horizontal direction is included, the deflection angle in the horizontal direction of the deflecting device with respect to the electron beam that scans this vertically long region is smaller than the deflection angle in the vertical direction. 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. When the deflection angle θ increases, the deflection power becomes sin (θ / 2)
. For example, when the horizontal deflection angle is 1
With / 2, the deflection power is reduced to 1/3. Therefore, in a picture tube device that scans by dividing the phosphor screen into a plurality of regions, if the region is vertically long, the deflection power of the whole picture tube device can be suppressed to a practically usable value.

If the deflection angle in the horizontal direction is large, the trajectory of the electron beam becomes complicated due to raster distortion and convergence adjustment, and it becomes difficult to properly land on a predetermined phosphor layer. Then, the deflection aberration is reduced, the 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 easily land properly on the predetermined phosphor layer.

[0014]

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

FIG. 1 shows a color picture tube apparatus according to an embodiment of the present invention, and FIG. The color picture tube device includes a substantially rectangular flat glass face plate 1, a side wall 2 joined to a peripheral portion of the face plate 1, and extending substantially perpendicular to the face plate 1. A vacuum envelope including a substantially rectangular flat glass rear plate 3 joined to and opposed to the face plate 1 in parallel with the side wall 2 and a plurality of funnels 4 joined to the rear plate 3. 5
The plurality of funnels 4 are joined around a plurality of openings 6 formed in the rear plate 3.
8 in the horizontal direction (X direction), 3 in the vertical direction (Y direction)
And a total of 24 funnels 4 are joined.

On the inner surface of the face plate 1, blue,
One phosphor screen of an integral structure comprising a vertically elongated striped three-color phosphor layer emitting green and red light and a black stripe made of a light-absorbing substance provided between the three-color phosphor layers. 8 are formed. A shadow mask 9 is arranged inside the phosphor screen 8 so as to face the phosphor screen 8. The shadow mask 9 has a portion corresponding to a plurality of regions R1 to R24 which are divided and scanned in the horizontal and vertical directions by an electron beam, as described later, as an effective portion in which a large number of electron beam passage holes are formed. ,
Although they are connected in the vertical direction, they are divided in the horizontal direction into a number corresponding to the number of divisions in the horizontal direction (eight in the illustrated example divided into eight in the horizontal direction). Each of the divided shadow masks is fixed in a state where tension is applied to a pair of metal first mask erection members 10 each having a U-shaped cross section, which are fixed at both ends in the vertical direction of the rear plate 3 by frit glass. The plurality of metal second mask erection members 11 fixed to the inside of the first mask erection member 10 and the vertical intermediate portion of the rear plate 3 with frit glass are lifted in the direction of the phosphor screen 8. First and second mask erection members 10, 1
1, the phosphor screen 8 is held with high precision at a predetermined interval with respect to the phosphor screen 8.

When the shadow mask 9 is divided in the horizontal direction as described above, even if heat is generated by the impact of the electron beam, the heat is not transmitted to the divided adjacent shadow mask.
Purity drift due to thermal expansion of the shadow mask that occurs in a conventional color picture tube device can be prevented. Note that, although the three-color phosphor layers of the phosphor screen 8 are formed in a vertically long stripe shape in the vertical direction, they are affected by the thermal expansion of the shadow mask. Absent.

An electron gun 14 for emitting a single electron beam is provided in the neck 13 of each of the funnels 4. Further, outside the funnels 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 into substantially three electron beams. A deflecting unit including a device (not shown) and a main deflecting device (not shown) for generating a main deflecting magnetic field for further deflecting the electron beam predeflected by the predeflecting device is arranged.

A metal columnar support member (not shown) is provided between the face plate 1 and the rear plate 3 to support the atmospheric load applied to the flat face plate 1 and the rear plate 3. ing. This support member is formed in a wedge-like shape at the tip end in contact with the phosphor screen 8, the length direction thereof is aligned with the length direction of the black stripe of the phosphor screen 8, and the support member penetrates the shadow mask 9. It is fixed to the rear plate 3 by frit glass.

In this color picture tube device, an electron beam emitted from an electron gun 14 disposed in each neck 13 of the funnel 4 is converted into an auxiliary beam generated by a preliminary deflection device mounted outside each funnel 4. Preliminarily deflects in the horizontal direction by the deflecting magnetic field into three electron beams having different positions on the deflection center plane of the main deflecting device. The predeflected electron beams are horizontally and vertically deflected by the main deflecting magnetic field generated by the main deflecting device. The phosphor screen 8 is divided into a plurality of regions corresponding to the electron gun 14 in the horizontal and vertical directions via the shadow mask 9 for scanning. That is, in the illustrated example, scanning is performed by dividing into 24 regions R1 to R24 divided into eight in the horizontal direction and three in the vertical direction. Then, color switching is performed for each horizontal and vertical scan. The raster drawn on the phosphor screen 8 by the divided scanning is connected by a signal applied to the electron gun 14 and each deflector, and a single large raster is drawn on the entire surface of the phosphor screen 8.

In this color picture tube apparatus, in particular, 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 elongated longer in the vertical direction than in the horizontal direction. It has become.

For example, the effective portion of the phosphor screen 8, that is, a phosphor screen equivalent to a 32-inch tube with a screen size of 664 mm in the horizontal direction and 373.8 mm in the vertical direction, is 83 mm in the horizontal direction and 83 mm in the vertical direction. 124.6
The scanning is performed while being divided into 24 regions R1 to R24 of mm. Then, as shown in FIG. 3, the deflection center O is set so that the diagonal deflection angle θD is 50 ° with respect to each of the regions R (R1 to R24), and the horizontal deflection angle is 29. 0 °,
The vertical deflection angle 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 extremely short, 220 mm.

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

That is, the face plate 1
The phosphor screen 8 is formed on the inner surface of the substrate. On the other hand, the first and second mask erection members 10 and 11 and the columnar support member for supporting the atmospheric pressure load applied to the face plate 1 and the rear plate 3 are coated and sintered at predetermined positions on the inner surface of the rear plate 3 by frit glass. To fix.
Then, welding is performed while applying tension to the shadow mask 9 by the first mask erection member 10. Also each funnel 4
The electron gun 14 is sealed in the neck 13 of FIG. Then, the face plate 1 on which the phosphor screen 8 is formed, the rear plate 3 on which the columnar support member is fixed and the shadow mask 9 is erected, the funnel 4 and the side wall 2 of the electron gun 14 sealed in a predetermined relationship. Positioning and positioning,
These are integrally joined by frit glass. Thereafter, the envelope 5 is assembled by evacuating the integrally assembled envelope 5.

As a method of manufacturing this color picture tube device, in addition to the above, after the funnel 4 is joined to the rear plate 3, the electron gun 14 may be sealed in the neck 13 and the side wall 2 may be previously formed. The first mask erection member 10 may be fixed to the rear plate 3 and the shadow mask 9 may be attached to the first mask erection member 10. 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 each elongated in the vertical direction with respect to the horizontal direction. If it is vertically long, the deflection power of the entire color picture tube device can be reduced to a practical size. In addition, the electron beam can be easily and correctly landed on a predetermined phosphor layer by reducing raster distortion and misconvergence.

That is, in general, the deflection power of the horizontal deflection is much larger than the resistance loss because the reactive power is much larger than the resistance loss. The resistance loss is larger than that, and the inductance can be ignored. Moreover, the resistance loss is 1/20 to 1/1/2 of the inductance.
Since it is 40, the deflection power may be considered with respect to horizontal deflection power having a high frequency.

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. It is divided into a total of 24 regions R1 to R24, and the horizontal length of each of the regions R1 to R24 is 11
Assuming a substantially square shape having a length of 0.7 mm and a vertical length of 93.5 mm, the deflection angle in the horizontal direction is 39.2 °, and the color picture tube apparatus of this example is provided for sin (θ / 2). It is about twice as large as that of. This means that the deflection power can be reduced to about に よ り by making the divided area vertically elongated as shown in FIG. 1 rather than making it substantially square as shown in FIG. Therefore, when a plurality of regions are vertically divided and scanned as in the color picture tube device of this example, the deflection power can be greatly reduced, and the size can be made practical.

In the color picture tube device, the deflected electron beam lands on a predetermined phosphor layer of the phosphor screen through the electron beam passage hole of the shadow mask. In such a color picture tube device, even if the trajectory of the electron beam shifts in the vertical direction, color shift 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 properly on a predetermined phosphor layer. For example, as shown by the broken line, the blue phosphor layer 26B
When the trajectory 25 of the electron beam landing on the green phosphor layer shifts in the horizontal direction as shown by the solid line, the electron beam lands 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 or the effect of an electromagnetic field on the electron beam, and the larger the horizontal deflection angle, the greater the occurrence.

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 susceptible to thermal fluctuations and mechanical vibrations, but also has a longer trajectory of the deflected electron beam and is more susceptible to external electromagnetic fields. If the horizontal deflection angle is large, the electron beam enters 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 greatly changes, and mislanding easily occurs. Also, the trajectory of the electron beam becomes complicated due to raster distortion and convergence adjustment caused by a large deflection angle, and the phosphor layers 19B, 19G, 1
Accurate landing on 9R becomes difficult.

However, as in the color picture tube apparatus of this example, when each divided area is vertically long in the vertical direction with respect to the horizontal direction, the deflection angle in the horizontal direction can be reduced.
The problem that occurs when the horizontal deflection angle is large can be solved.

In the above-described embodiment, the case where the phosphor screen is divided into eight in the horizontal direction and three in the vertical direction and scanned in total is described. It is only necessary to be vertically long, and it is not limited to the number of divisions of the region in the above embodiment.

Further, not all of the divided areas need to be vertically long. Also, the size of the divided area does not need to be constant.

In the above-described embodiment, the deflection angle of the divided area is set to 50 °.
A color picture tube device that can obtain the same effect even when the angle is 70 °, 90 °, 110 °, or the like can be obtained.

In the above embodiment, the face plate and the rear plate of the envelope are flat, and a support member is arranged inside the envelope to support the atmospheric load of the flat face plate and the rear plate. Although the color picture tube device described above has been described, the present invention can also be applied to a color picture tube device having a face plate having a curvature and not requiring a support member for supporting an atmospheric pressure load.

Also, the construction member of the shadow mask may be other than the above-described embodiment, and the construction method of the shadow mask may be another method such as construction on the side wall of the envelope.

In the above embodiment, the case where the electron beam emitted from each electron gun is deflected by the deflecting device that generates the magnetic field has been described.
The electrostatic deflection may be performed, 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 reference to a color picture tube device, the present invention is applicable to other black and white picture tube devices.

[0039]

According to the present invention, electron beams emitted from a plurality of electron guns arranged separately are deflected by a plurality of deflecting devices, and a plurality of phosphor screens are horizontally and vertically deflected by the deflected electron beams. In a picture tube device that scans by dividing into a plurality of regions, if a plurality of regions are configured to include a vertically long region that is longer in the vertical direction than in the horizontal direction, the deflection device with respect to the electron beam that scans this vertically long region may be used in a horizontal direction. The deflection angle is smaller than the vertical deflection angle. As a result, most of the deflection power is consumed by 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 practically usable value. Become like

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

[Brief description of the drawings]

FIG. 1A is a diagram for explaining the configuration of a color picture tube device according to an embodiment of the present invention, and FIG. 1B is a cross-sectional view taken along the line BB.

FIG. 2 is an exploded perspective view for explaining a 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 in a case where a divided area shown for comparison with the color picture tube device has a square shape.

FIG. 5 is a view for explaining mislanding with respect to a phosphor screen having a vertically elongated stripe-shaped phosphor layer.

[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-R24 ... Region

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-64-89252 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H01J 31/00

Claims (1)

(57) [Claims] 1. An electron gun section 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 that is divided into a plurality of regions in the horizontal and vertical directions and scanned by each electron beam deflected by each of the deflecting devices. A picture tube device including a vertically long region that is longer in the vertical direction than in the horizontal direction.