JPH08241684A - Index type color picture tube - Google Patents

Abstract

PURPOSE: To decrease shielding of electron beam by a support for a flat face plate and reduce the portion where the color purity is deteriorated, by arranging the support in a specific relation to an index signal generating phosphor layer and a photo-absorbing layer. CONSTITUTION: Screen parts 15, 23 are scanned with electron beams emitted from a plurality of electron guns 17 while the area is divided into a plurality of square regions in the horizontal and vertical directions, wherein each screen part is composed of three-color phosphor layers B, G, R and a photo-absorbing layer 21. The layer 21 is located on the boundary center line of the region adjacent in the vertical direction and the first index signal generating phosphor layer 24 is furnished in such a way as avoiding the layer 21 on the center line. When a support 20 for the atmospheric pressure load applied to the face plate 10 is located in the boundary center, the unscanned area of each region produced by the first and second phosphor layers 24, 25 being intercepted with the support 20 can be lessened.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an index type color picture tube, and more particularly, it divides a screen portion formed on the inner surface of a flat face plate into a plurality of regions by electron beams emitted from a plurality of electron guns. The present invention relates to an index type color picture tube which reproduces a color image by scanning with a color image.

[0002]

2. Description of the Related Art In recent years, there have been increasing demands for higher-luminance, higher-definition, larger-size, and flat screens of color picture tubes accompanying high-definition broadcasting, and various studies have been made accordingly. .

Among these, the high definition of the color picture tube can be realized by a commonly used method for reducing the spot of the electron beam on the phosphor screen.
Therefore, it has been studied so far to obtain a smaller beam spot by the electrode structure of the electron gun, the voltage arrangement, etc., but a sufficiently small beam spot has not yet been obtained.

This is related to the increase in size, which is one of the requirements for the color picture tube. That is, when an attempt is made to increase the size of the screen of the color picture tube, the deflection power increases and the shape of the beam spot in the peripheral portion of the screen becomes worse. Therefore, there is a limit to increase the deflection angle, and the limit is about 110 °. However, even if the deflection angle is 110 °, if the size is increased as it is, the distance from the electron gun to the phosphor screen becomes long, the electron optical magnification of the electron gun becomes large, and the beam spot cannot be made sufficiently small.

Regarding the increase in brightness of a color picture tube,
As the screen becomes larger, the electron density per unit area decreases. Therefore, the enlargement of the screen is one of the causes of the decrease in brightness. Therefore, in the shadow mask type color picture tube, a decrease in brightness is avoided by increasing the anode voltage and the cathode current. However, even if the reduction in brightness is prevented by such a method, the shape of the beam spot on the screen is distorted, resulting in a decrease in resolution, an increase in the shape of the beam spot due to an increase in cathode current, and a deterioration in color purity due to thermal deformation of the shadow mask. And so on.

In particular, the difficulty in increasing the brightness of the shadow mask type color picture tube is largely due to the shadow mask itself. That is, the aperture ratio (aperture area / total area) of the shadow mask is usually about 20%, and among the electron beams emitted from the electron gun, the electron beam reaching the phosphor screen through the aperture of the shadow mask. Is about 20%, and the remaining about 80% of the electron beam impinges on the shadow mask and heats it. This heating causes thermal expansion of the shadow mask, which causes deterioration of color purity due to a change in relative position with the phosphor screen.

As a color picture tube capable of avoiding the problems of the shadow mask type color picture tube, there is an index type color picture tube disclosed in Japanese Patent Publication No. 59-29069. In this index type color picture tube, a stripe-shaped phosphor layer for generating an index signal is provided on a phosphor screen composed of a stripe-shaped three-color phosphor layer, and the phosphor screen is started outside the effective surface on the scanning start side. When the phosphor screen for generating the index signal is provided and the phosphor screen is scanned by the electron beam emitted from one electron gun, the start index signal and the index signal generated from the phosphor layer for generating the start index signal are generated. The index signal obtained from the phosphor layer for use is detected by the photoelectric conversion device, and based on the start index signal, circuit preparation is performed for color switching on the phosphor screen, and based on the index signal obtained after that. The structure to perform sequential color switching. It is.

According to such an index type color picture tube, as compared with the shadow mask type color picture tube,
Since the electron beam emitted from the electron gun can be used efficiently, it can be used as a color picture tube that displays a high-luminance image. However, in such an index type color picture tube, the beam spot diameter on the phosphor screen, particularly the beam spot diameter in the horizontal scanning direction, must be made equal to or less than the width of the stripe of the three-color phosphor layer over the entire surface of the phosphor screen. I won't. However, if such an index type color picture tube is made large, the distance from the electron gun to the phosphor screen becomes long as in the case of the shadow mask type color picture tube, and the spot diameter of the electron beam is made small over the entire screen. Becomes extremely difficult.

On the other hand, in Japanese Patent Publication No. 4-53067, a phosphor screen composed of a stripe-shaped three-color phosphor layer is provided on the inner surface of a flat face plate, and the stripe screen is formed on the phosphor screen. The screen portion provided with the phosphor layer for generating the index signal is divided into a plurality of regions by the electron beam emitted from the plurality of electron guns 3 and scanned, thereby synthesizing the images divided into the respective regions. Then, an index type color picture tube for displaying one composite color image is shown.

With such a structure, the index type color picture tube can be increased in size, and the color picture tube can be increased in size, high in brightness and high in definition. However, such a color picture tube requires a support for supporting the atmospheric pressure load applied to the flat face plate 1.

Arranging the support to support the atmospheric load on such a flat face plate is:
3 stripes on the inner surface of an already flat face plate
A phosphor screen composed of a color phosphor layer and a stripe-shaped light absorbing layer between the three color phosphor layers is formed, and a shadow mask is arranged inside the phosphor screen so as to face the phosphor screen. Is used in a shadow mask type color picture tube that scans a plurality of areas divided by an electron beam emitted from a plurality of electron guns.
As an example thereof, Japanese Patent Application No. 5-21999 discloses that
There is shown a shadow mask type color picture tube in which a support is arranged on an intersection of areas to be horizontally and vertically divided and scanned. The support is arranged so that its tip is in contact with the light absorbing layer located on the intersection of the above-mentioned regions, and its tip is narrower in width than the width of the light absorbing layer, preferably in the longitudinal direction of the light absorbing layer. It is formed in a plate shape that is as long as possible.

However, when a support for supporting an atmospheric pressure load applied to such a flat face plate is applied to an index type color picture tube, as shown in FIG.
When the electron beam 2 emitted from the electron gun 1 arranged corresponding to a overscans the adjacent portions of the adjacent regions Rb, Rc, Rd, Re, the portion 4a which is blocked by the support 3 and is not scanned , 4b are formed, and a necessary index signal cannot be obtained from the index signal generating phosphor layer provided in the overscan portion. As a result, the color switching necessary for scanning the area Ra is not completely performed, and a portion where the color purity is deteriorated partially occurs.

[0013]

As described above, as a color picture tube capable of increasing in size, brightness, and definition,
A screen in which a phosphor screen composed of a stripe-shaped three-color phosphor layer and a light absorption layer is provided on the inner surface of a flat face plate, and a stripe-shaped index signal generating phosphor layer is provided on the light absorption layer. Part is scanned by dividing the phosphor screen into a plurality of areas by scanning with an electron beam emitted from a plurality of electron guns, thereby combining images drawn in the respective areas to display a combined color image. Index type color picture tubes have been proposed.

However, in this index type color picture tube, it is necessary to dispose a support for supporting the atmospheric pressure load applied to the flat face plate 1 in the envelope. Such a support is a flat face plate. Is provided with a phosphor screen composed of a stripe-shaped three-color phosphor layer and a light absorption layer on the inner surface thereof, and a shadow mask is arranged inside the phosphor screen so as to face the phosphor screen and emitted from a plurality of electron guns. As in a shadow mask type color picture tube that divides and scans into a plurality of regions by an electron beam, when placed on the intersection of adjacent regions, when the electron beam scanning each region overscans the adjacent portion of the adjacent region, There is a portion that is blocked by the support and is not scanned, and the necessary index signal is generated from the phosphor layer for generating the index signal that is provided in the overscanned portion. Can not be obtained. As a result, the desired color switching necessary for scanning the area is not completely performed,
There is a problem that a part where the color purity is deteriorated partially occurs.

The present invention has been made in view of the above problems, and a screen portion provided on the inner surface of a flat face plate constituting a vacuum envelope is provided with an electron beam emitted from a plurality of electron guns. In an index type color picture tube that divides into a plurality of areas and scans to combine the images drawn in each area to display a composite color image, by a support that supports the atmospheric pressure load applied to the face plate Reduce the blocking of the electron beam,
The purpose is to reduce the portion of color purity deterioration that partially occurs.

[0016]

A support for supporting an atmospheric pressure load applied to a face plate is arranged inside a flat vacuum envelope having a substantially rectangular face plate, and stripe-shaped plural colors are provided on an inner surface of the face plate. A plurality of rows of the phosphor layers and the stripe-shaped light absorption layers provided between the phosphor layers are arranged in parallel at a predetermined array pitch, and the index signal generating phosphor layers are arranged in a predetermined array at positions overlapping the light absorption layers. An index type color picture tube is provided with a screen portion formed by arranging a plurality of rows in parallel at a pitch, and dividing the screen portion into a plurality of rectangular regions in horizontal and vertical directions by an electron beam emitted from a plurality of electron guns and scanning. , The index signal generating phosphor layer overlaps with the light absorption layer located on the center line connecting the centers of the boundaries of the vertically adjacent regions. Formed avoiding the location was a support to the distal end portion is disposed on the boundary of the area adjacent to the vertical direction in contact with the light absorbing layer located on the center line.

[0017]

When the support is arranged as described above, the portion where the scanning of the electron beam is blocked by the support is narrowed, and in the optimum case, it can be accommodated within the width of the stripe-shaped light absorbing layer, and it can be surely carried out. It is possible to scan the phosphor layer for generating the index signal.

[0018]

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

1 to 4 show an index type color picture tube which is one of the embodiments. This color picture tube has a vacuum envelope composed of a substantially rectangular flat face plate 10 and a funnel portion 12 connected to a skirt portion 11 provided in the peripheral portion of the face plate 10. The funnel portion 12 is composed of a plurality of funnels 13. In the illustrated example, four in the horizontal direction (X-axis direction) and three in the vertical direction (Y-axis direction), a total of 12 funnels.
What is constituted by the individual funnels 13 is shown.

A screen portion 15, which will be described later, is provided on the inner surface of the face plate 10. Inside the neck 16 of each funnel 13, a plurality of electron guns 17 for emitting a single electron beam are arranged. A deflection device 18 is arranged outside each funnel 13. Further, in the funnel portion 12, a pair of light receiving windows (not shown) are provided in the horizontal and vertical directions with the funnels 13 interposed therebetween.
As shown in FIGS. 2, 3 and 4, the photoelectric conversion layers 19a and 19a are provided outside the pair of light receiving windows, respectively.
9b is provided. Further, inside the vacuum envelope, there are arranged a plurality of supports 20 to be described later that support an atmospheric pressure load applied to the flat face plate 10.

This color picture tube comprises a plurality of deflecting devices arranged outside the plurality of funnels 13 for a single electron beam emitted from the plurality of electron guns 17, in the illustrated example, twelve electron guns 17. It is deflected in the horizontal and vertical directions by the magnetic field generated by 18, and the screen section 15 is divided into four regions in the horizontal direction and three in the vertical direction for a total of 12 regions R1 to R12 for scanning. There is.

As shown in FIG. 5, the screen portion 15 has a striped three-color phosphor layer B, which is vertically elongated.
A plurality of G and R are formed in parallel in the horizontal direction at a predetermined arrangement pitch, a stripe-shaped light absorbing layer 21 is provided between the respective phosphor layers B, G, R, and these three-color phosphor layers B,
The phosphor screen 23 in which the aluminum vapor deposition film 22 is formed on the back surfaces of the G and R and the light absorption layer 21, and the three-color phosphor layers B and G at positions overlapping the light absorption layer 21 via the aluminum vapor deposition film 22. , R, the first phosphor layer 2 for generating the first index signal, which is formed in parallel in a plurality of rows in the horizontal direction at a predetermined arrangement pitch and has a vertically elongated stripe shape.
Second index signals formed in parallel with each other on the aluminum vapor deposition film 22 at a predetermined array pitch in the vertical direction by inclining at a predetermined angle with respect to the longitudinal directions of the four and three-color phosphor layers B, G, and R. And a phosphor layer 25 for generation.
The array pitch of the first phosphor layer 24 for generating an index signal changes near the scanning start side of each region divided and scanned by the electron beam. In addition, in the screen portion 15, the light absorption layer 21 is provided so as to be located on the center line that connects the centers of the boundaries with the vertically adjacent regions in all of the plurality of regions, and is located on this center line. The first index signal generation phosphor layer 23 is formed on the light absorption layer 21 in a structure not formed.

A specific example of such a screen portion 15 will be described. As for the overall size of the screen portion 15, the length in the horizontal direction is 406.4 mm, the length in the vertical direction is 304.8 mm, and the diagonal length is diagonal. It is formed in a rectangular shape with a length of 508.0 mm in the direction, and has the same size as the phosphor screen of a so-called 20-inch color picture tube, and the number of single electron beams emitted from 12 electron guns increases to 12 The size of each area to be divided and scanned is a rectangle with a side length of 101.6 mm in both the horizontal and vertical directions, and each area is equivalent to a 5.7-inch color picture tube phosphor screen. It is the size to do.

The width Tp and array pitch Ps of the three-color phosphor layers B, G, R of the screen portion 15 are Tp = 0.1065 mm Ps = 0.5295 mm, respectively. The light absorption layer 21 and the first index signal generation phosphor layer 24 and the second index signal generation phosphor layer 25 provided so as to overlap therewith are formed to have the same width Tb, and the width Tb, The array pitch Pa of the first phosphor layer 23 for index signal generation and the horizontal array pitch Pb of the phosphor layer 24 for index signal generation are Tb = 0.07 mm Pa = Ps × (2/3), respectively. ) = 0.353 mm Pb = 4 · Pa = Ps × (8/3) = 1.412 mm, and the second index signal generating phosphor layer 24.
Is inclined about 65 ° to the right with respect to the vertical direction.

The pattern of the index signal generating phosphor layer is preferably the same in each adjacent region.

Further, as shown in FIG. 4, the support is provided on the center of the boundary between the vertically adjacent regions while avoiding the first and second index signal generating phosphor layers 23 and 24. As shown in FIG. 5A, the tip portion thereof is in contact with the light absorption layer 21 provided on the center line connecting the centers of the boundaries with the vertically adjacent regions. As shown in FIG. 6A or 6B, the tip of the support, which is in contact with the light absorption layer 21, is a plate-like portion 26 narrower than the width of the light absorption layer and long in the longitudinal direction of the light absorption layer. Alternatively, it is formed in a shape having a plurality of contact portions 27.

Next, the operation of the color picture tube will be described.

In the conventional general color picture tube, an electron beam emitted from one electron gun is deflected by a magnetic field generated by one deflection device, and the entire surface of the phosphor screen is scanned to obtain a color image. The image is playing. On the other hand, in the color picture tube of this example, as described above, in the illustrated example, 12 electron beams emitted from the electron guns 17 arranged in the necks 16 of the 12 funnels 13 are emitted. The screen unit 15 is deflected in the horizontal and vertical directions by the magnetic field generated by the deflecting device 18, and the screen portion 15 is divided into 12 regions R.
By dividing and scanning 1 to R12, each region R1 to
A color image is reproduced by synthesizing the images divided into R12.

In this case, the scanning and color switching of each of the regions R1 to R12 is performed by using the light emission of the first index phosphor layer 24 provided in each of the regions R1 to R12 as the first index signal. A pair of photoelectric conversion devices 19a arranged in each funnel 13 corresponding to R1 to R12 receives the light, and the light emitted from the second index phosphor layer 25 is used as a second index signal, which is used as each region R1 to R12.
Corresponding to the above, the pair of second photoelectric conversion devices 19b arranged in each funnel 11 receives the light and converts it into an electric signal, and drives each electron gun 17 and each deflection device 18 based on each electric signal. It is carried out by controlling the driving device that operates.

For example, as shown by the solid line 29 in FIG.
When the electron beam scans the screen portion 15 in the horizontal direction, the first index phosphor layer 24 causes the electron beam to scan as shown in FIG.
The first index signal 30 shown in
The horizontal position of the electron beam can be known from the index signal 30 of. Therefore, according to the first index signal 30 obtained from the first index phosphor layer 24,
By feeding back to the driving circuit of the electron gun so as to switch the three-color video signals of blue, green, and red to be supplied to the predetermined electrodes of the electron gun, and performing the color switching, the conventional index type color picture tube can be obtained. Similarly, color display is possible. Further, since the horizontal position of the electron beam is known, it is possible to adjust the raster position and the video signal at the horizontal end of each region.

By scanning the electron beam in the horizontal direction, a second index signal 31 shown in FIG. 8B corresponding to FIG. 8A is obtained from the second index phosphor layer 25. The time interval t2 of the second index signal 31
The horizontal scanning of the screen unit 15 is shown by the solid line 29 in FIG.
Assuming that it is a straight line and has a constant velocity as shown in FIG. 8, n times the time interval t1 of the first index signal 30 obtained from the first index phosphor layer shown in FIG.・ T1. For example, when n = 4 as in the illustrated example, t2 = 4t1.

However, when the horizontal scanning of the electron beam is not a straight line due to the deflection distortion but becomes a curve 29a which rises to the right as shown in FIG. 7, the second index signal obtained from the second index phosphor layer 25 is obtained. The time interval of 31 changes, and as shown in FIG.
21 is shorter than t2 by .DELTA.t1 and t21 = t2-.DELTA.t1. From this, the second index phosphor layer 2
From the second index signal 31 obtained from No. 5, a normal horizontal scanning line (solid line 2
The vertical deviation from 9), that is, the vertical position of the electron beam is known.

Therefore, a change in the time interval of the second index signal 31 obtained from the second index phosphor layer is detected, and the time interval when the electron beam scans the screen portion linearly and at a constant speed. Based on the difference .DELTA.t1 from t2, the driving circuit for driving the deflecting device is controlled so that the electron beam is corrected in the direction approaching the normal horizontal scanning line and the solid line 29 is scanned. By correcting the position of the electron beam in the vertical direction in this way, the electron beam can scan the screen portion in a straight line in the horizontal direction.

When the vertical position of the electron beam is corrected by the second index signal 31 obtained from the second index phosphor layer 25 as described above, the first index phosphor layer 24 obtains the first index phosphor layer 24. Although the time interval t1 of the index signal 30 of No. 1 changes, the bending of the horizontal scanning line due to deflection distortion or the like is generally gentle.
The change of the time interval t1 of the index signal 30 can be ignored and does not disturb the feedback system.

Further, the horizontal scanning of the electron beam is caused by the deflection distortion, and as shown in FIG.
Then, as shown in FIG. 8D, the time interval t22 of the second index signal from the second index fluorescent substance 27 is longer than t2 by .DELTA.t2, and t21 = t2 + .DELTA.t2. Also in this case, the second index phosphor layer 25
From the second index signal 31 obtained from the above, the vertical deviation from the normal horizontal scanning line, that is, the vertical position of the electron beam is known, and the time of the index signal 31 obtained from the second index phosphor layer is obtained. The change .DELTA.t2 from the time interval t2 when the electron beam scans the screen portion linearly and at a constant speed by detecting the change in the interval.
On the basis of the above, the electron beam is corrected in the direction of approaching the normal horizontal scanning line, and the drive circuit for driving the deflecting device or the like is controlled so as to scan on the solid line 29. By correcting the position of the electron beam in the vertical direction in this way, the electron beam can scan the screen portion in a straight line in the horizontal direction.

Therefore, as described above, the three-color phosphor layer B,
First index phosphor layer 23 parallel to G and R, and 3
And a second index phosphor layer 24 inclined by a predetermined angle with respect to the color phosphor layers B, G, R.
First obtained from the index phosphor layers 23, 24 of
The second index signal is detected by the first and second photoelectric conversion devices 19a and 19b, respectively, and the electron gun 17 and the deflection device 18 are detected based on the first and second index signals.
It is possible to easily align the scanning lines at the boundary between the vertically adjacent regions by making control such as the above, and to make the joint between the vertically adjacent regions inconspicuous.

In this case, the first index phosphor layer and the second index phosphor layer are made of phosphors having different emission spectrum peak values, so that the first index phosphor layer and the second index phosphor layer are formed. The light emission of the layer can be separately detected by the first and second electric conversion devices.

By the way, like the color picture tube of this example, the light absorption layer 21 of the phosphor screen 23 including the three color phosphor layers B, G and R and the light absorption layer 21 is made to be adjacent to the vertically adjacent region. Of the light absorption layer 21 provided on the center line connecting the centers of the boundaries of the
When the first index phosphor layer 23 is provided while avoiding the above, and the support body 20 supporting the atmospheric pressure load applied to the flat face plate 10 is arranged on the center of the boundary with the vertically adjacent region, , The non-scanned portions of the respective regions R1 to R20 caused by the second index signal generating phosphor layers 23 and 24 being blocked by the support can be made smaller.

That is, in order to support the atmospheric pressure load applied to the flat face plate of the index type color picture tube, the phosphor screen provided on the inner surface of the flat face plate is divided into a plurality of regions in the horizontal and vertical directions. As in a known shadow mask type color picture tube that scans by using the above, when it is arranged at a position in contact with the light absorption layer located at the intersection of the areas, it is arranged corresponding to the area Ra as shown in FIG. When the electron beam 2 emitted from the scanning electron gun 1 overscans the adjacent regions Rb, Rc, Rd, Re, the portions 4a, 4 which are blocked by the support 3 and are not scanned.
b, the necessary index signal cannot be obtained from the phosphor layer for generating an index signal provided in the overscan portion, the color switching required for scanning the region Ra is not completely performed, and the color purity is partially reduced. A deteriorated part occurs. However, if the support 20 is provided on the center of the boundary between the vertically adjacent regions as in the color picture tube of this example, avoiding the first and second index signal generating phosphor layers 23 and 24, the scanning is performed. It is possible to minimize the non-reflected portion, thereby reducing the partial portion where the color purity deteriorates due to the electron beam being blocked by the support 20, and by optimizing the placement of the support 20, that portion can be reduced. It is possible to completely eliminate the portion where the color purity deteriorates.

[0040]

EFFECTS OF THE INVENTION A support for supporting an atmospheric pressure load applied to a face plate is arranged inside a flat vacuum envelope having a substantially rectangular face plate, and stripe-shaped phosphor layers of a plurality of colors are formed on the inner surface of the face plate. And a plurality of stripe-shaped light absorbing layers provided between the phosphor layers are formed in parallel at a predetermined array pitch, and a plurality of index signal generating phosphor layers are formed at a predetermined array pitch at positions overlapping the light absorbing layers. A screen part formed in parallel is provided,
In an index type color picture tube in which the screen portion is divided into a plurality of rectangular regions in the horizontal and vertical directions by an electron beam emitted from a plurality of electron guns and scanned, the phosphor layers for generating an index signal are vertically adjacent to each other. It is provided so as not to overlap with the light absorption layer located on the center line connecting the centers of the regions, and the support is placed on the boundary of the vertically adjacent regions, and the tip is located on the center line. When it comes into contact with the absorption layer, the portion where the scanning of the electron beam is blocked by the support becomes narrow, and in the optimum case, it can be contained within the width of the stripe-shaped light absorption layer, and the phosphor for generating the index signal can be surely formed. It is possible to scan the layer, and it is possible to eliminate a portion where the color purity deteriorates due to the electron beam being blocked by the support. as a result,
It is possible to improve the image quality displayed on the screen of a high-luminance, large-index type color picture tube.

[Brief description of drawings]

FIG. 1 is a perspective view of an index type color picture tube according to an embodiment of the present invention as viewed from the front side.

FIG. 2 is a perspective view of the index type color picture tube seen from the back side.

3 (a) is a sectional view taken along the line AA of the index type color picture tube shown in FIG. 1, and FIG. 3 (b) is a sectional view taken along the line BB.

FIG. 4 is a view showing an arrangement of photoelectric conversion devices and supports of the index type color picture tube.

5 (a) is a perspective view showing a configuration of a screen portion of the index type color picture tube, and FIG. 5 (b) is a sectional view showing a configuration of the screen portion.

6 (a) and 6 (b) are views showing shapes of different supports of the index type color picture tube, respectively.

FIG. 7 is a diagram for explaining the operation of the index type color picture tube.

8A to 8D are views of index signals for explaining the operation of the index type color picture tube.

FIG. 9 is a diagram for explaining a problem that occurs when a support body that supports an atmospheric pressure load applied to a flat face plate is arranged.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Face plate 13 ... Funnel 15 ... Screen part 17 ... Electron gun 19a ... 1st photoelectric conversion device 19b ... 2nd photoelectric conversion device 20 ... Support 22 ... Aluminum vapor deposition film 23 ... Light absorption layer 24 ... 1st Intex signal generating phosphor layer 25 ... Second intex signal generating phosphor layer 30 ... First intex signal 31 ... Second intex signal B, GR ... Three-color phosphor layer

Claims (1)

[Claims] 1. A support body for supporting an atmospheric pressure load applied to the face plate is arranged inside a flat vacuum envelope having a substantially rectangular face plate, and stripe-shaped fluorescent lights of a plurality of colors are formed on an inner surface of the face plate. The body layers and the stripe-shaped light absorption layers provided between the phosphor layers are formed in parallel in a plurality of rows at a predetermined arrangement pitch, and the index signal generating phosphor layers are arranged at a predetermined arrangement pitch at positions overlapping the light absorption layers. In an index type color picture tube which is provided with a screen portion formed by a plurality of columns arranged in parallel, and which divides the screen portion into a plurality of rectangular regions in the horizontal and vertical directions by an electron beam emitted from a plurality of electron guns and scans them. The index signal generating phosphor layer overlaps with the light absorption layer located on the center line connecting the centers of the boundaries of the vertically adjacent regions. Is a Avoid formation, the support index type color picture tube, wherein a distal end portion disposed on the boundary of the area adjacent to the vertical direction is in contact with the light absorbing layer located on the center line.