JPH1074474A - Character display tube screen and fluorescent character display tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a character display tube screen which has low cost, is easy to handle, requires no special machining for stable free-standing, and can sufficiently withstand external pressure even if an envelope becomes larger. SOLUTION: An anode substrate 4 on the inner face of which anodes 9 to be a display pattern are formed and a cathode substrate 5 to the inner face of which graphite paste 6 is applied are oppositely arranged at a predetermined interval d1, and an envelope portion is sealed thereto so as to constitute an envelope 3 whose inside is airtightly held in a high vacuum state. In the envelope 3, a character display tube screen 1 the whole of which is made of a metal member is disposed so as to withstand atmospheric pressure from the outside. A character display tube screen 1 is equipped with a disc-shaped seating portion 1a having a flat face 1aa which is fixed to the inner face side of the cathode substrate 5 via the graphite paste 6 and a tapered column portion 1b which is integrally hanging provided on the base portion 1a and the tip of which is positioned between the anodes 9 and abuts on the inner face of the anode substrate 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display tube provided in an envelope for preventing the envelope, which is hermetically maintained in a high vacuum state, from being deformed by atmospheric pressure from the outside. The present invention relates to a screen and a fluorescent display tube using the display tube screen.

[0002]

2. Description of the Related Art A fluorescent display tube will be described as an example of a display tube. A general fluorescent display tube has an envelope in which the inside is maintained in a high vacuum state, and various electrodes and the like are placed inside the envelope. It has a stored structure.

[0003] More specifically, the envelope has an anode substrate made of a glass substrate, a flat plate, and a side plate. And the inside is evacuated to a high vacuum state and kept airtight. An anode conductor is formed on the inner surface of the anode substrate, and a phosphor layer is formed on the anode conductor to form an anode. A grid is provided above the anode, and a filament cathode is provided above the grid. The thus constructed fluorescent display tube is excited and emits light when electrons emitted from the cathode are accelerated and controlled by the grid and impinge on the phosphor layer of the anode.

The envelope of this type of fluorescent display tube has a structure in which a gap between an anode substrate formed of a glass substrate and a flat plate is fixed only at an outer peripheral portion. When the glass is used for a long time, the substrate is bent, and when the internal stress of the glass becomes excessive, the substrate is broken and becomes unusable.

[0005] In order to solve the above-mentioned problem, an example of a fluorescent display tube having an anode substrate and a support for holding the wall surface of a flat plate against the atmospheric pressure in the envelope is described. JP-A-4-61847, JP-A-1-62.
Japanese Patent Application Laid-Open No. 643 and Japanese Utility Model Publication No. 2-9495 are known.

Here, the structure of the fluorescent display tube disclosed in each of the above publications will be described with reference to FIGS. FIG.
4 is a fluorescent display tube disclosed in Japanese Utility Model Laid-Open No. 4-61847, FIG. 15 is a fluorescent display tube disclosed in Japanese Utility Model Application Laid-Open No. 1-62643, and FIGS. 16 (a) and (b) are 2-949.
5 shows a fluorescent display tube disclosed in Japanese Patent Application Laid-Open No. 5-105, respectively.

In the fluorescent display tube shown in FIG. 14, a rectangular column 51 made of glass is used as a partition. The support column 51 is planted near the center of the flat plate 52 at a position facing the margin of the anode substrate 53.
A transparent conductive film 54 is provided on the inner surface of the flat plate 52 and the surface of the support 51.
Are formed. The transparent conductive film 54 on the surface of the support 51 is
The conductive paste 55 is electrically connected to the diffusion grid circuit on the anode substrate 53.

In the fluorescent display tube shown in FIG. 15, a column 56 having a conical or pyramid shape made of glass is used as a partition. The support 56 is provided between an anode substrate 57 on which a display pattern is formed and a flat plate 58 facing the anode substrate 57. More specifically, the bottom of the support 56 is fitted into the recess 59 of the anode substrate 57 on which the display pattern is formed, and the tip is provided in contact with the inner surface of the flat plate 58.

In the fluorescent display tube shown in FIGS. 16 (a) and 16 (b), a column 60 formed by bending a thin metal plate into an L shape is used as a partition. The column 60 made of a thin metal plate is
It is interposed between the opposing anode substrate 61 and the flat plate 62 and is erected and fixed between the grids 63. More specifically, a plurality of columns 60 are provided extending in the horizontal scanning direction between display patterns 64 arranged in a matrix inside the anode substrate 61. The left and right ends of the support 60 on the side of the flat plate 62 are bent in an L-shape to integrally form a mounting portion 60a.
Is fixed by spot welding on a metal base 65 adhesively fixed inside the substrate.

[0010]

However, FIG.
The configuration using the glass columns 51 and 56 as partitions as shown in FIG. 15 has the following problems. (1) Since processing is difficult and dimensional accuracy cannot be obtained, positional accuracy in, for example, automatic mounting by a robot or the like is poor, and mounting is troublesome. Further, when trying to achieve dimensional accuracy, machining is not easy, so that it is expensive. (2) Due to brittleness, there is a possibility of chipping due to impact or the like, handling requires care, and productivity is poor. (3) When an insulating material is present near the cathode, electrons emitted from the cathode charge the insulating material.
If the charge-up of electrons becomes a problem, the surface must be coated with a conductive material, which increases the cost. (4) A complicated shape is expensive. (5) When formed in a conical shape, the strength at the tip is insufficient. or,
It is difficult to make the tip thin, and it is not possible to cope with a display having a small dot pitch width. (6) In the case of a conical or pyramid shape, the glass must be cut into a conical shape, which increases the manufacturing cost. Each of the above-described items is a problem in the case where a glass column is used as a partition, but the same problem occurs when a ceramic column is used as a partition.

A metal support 6 shown in FIGS. 16 (a) and 16 (b)
In the configuration using 0, special processing such as bending a metal thin plate into an L-shape was necessary in order to stably support the support column 60 on the substrate.

Also, in the case of a fluorescent display tube using the glass columns 51 and 56 shown in FIGS. 14 and 15 and the thin metal column 60 shown in FIGS. Since there is a need for a sufficient space for arranging the pillars in a position where it does not occur, there is a problem that the display area of the display unit is reduced accordingly. Also, this kind of struts 51, 56, 6
When 0 is applied to a graphic fluorescent display tube having a small dot pitch width, it has been difficult to secure a sufficient space for disposing the columns.

Accordingly, the present invention has been made in view of the above problems, and is inexpensive and easy to handle, can be stably self-supported without requiring special processing, and has a large envelope. It is an object of the present invention to provide a screen for a display tube capable of sufficiently withstanding an external pressure, and to provide a fluorescent display tube capable of performing a desired display without causing charge-up of electrons without reducing a display area.

[0014]

In order to achieve the above object, the invention according to claim 1 is directed to an outer case in which the outer peripheral portions of two substrates arranged opposite to each other at a predetermined interval are hermetically sealed and sealed. In the display tube partition provided in the enclosure, a pedestal portion made of a metal member having a flat surface that comes into contact with an inner surface of one of the substrates, and the same metal member integrated with the pedestal portion; And a tapered pillar portion whose tip abuts on the inner surface of the other substrate of the substrate.

According to a second aspect of the present invention, there is provided a fluorescent display tube in which an outer peripheral portion of an anode substrate having a display pattern formed on an inner surface thereof and a flat plate opposed to the anode substrate at a predetermined interval are sealed. An envelope whose inside is airtightly maintained in a high vacuum state, a cathode provided in the envelope, for emitting electrons, and a cathode provided above the display pattern, for emitting electrons emitted from the cathode. A grid for accelerating control, a substantially disk-shaped pedestal portion made of a metal member having a flat surface in contact with the inner surface of the anode substrate, and an identical metal member integrated with the pedestal portion, and vertically suspended on the pedestal portion; ,
A screen for a display tube having a tapered pillar having a tip located between the display patterns and in contact with an inner surface of the anode substrate.

According to a third aspect of the present invention, there is provided a fluorescent display tube, wherein a plurality of strip-shaped insulating layers are formed at predetermined intervals on an inner surface, and an anode substrate having a display pattern formed between the insulating layers; An envelope that seals an outer peripheral portion of a flat plate that is opposed to the space and that is hermetically maintained in a high vacuum state, and a cathode provided in the envelope to emit electrons. A plurality of linear grids, each of which is provided in contact with the insulating layer and controls the acceleration of electrons emitted from the cathode, and a metal member having a flat surface in contact with the inner surface of the flat plate. Pedestal and
A display screen partition which is made of the same metal member integral with the pedestal portion, and is vertically provided on the pedestal portion, and has a tapered column portion whose tip abuts on the grid.

According to a fourth aspect of the present invention, in the fluorescent display tube according to the third aspect, the grid is formed of a linear electrode having a circular cross section, and a V-shaped tip is provided at the tip of the column portion of the display tube partition which comes into contact with the grid. Are formed.

According to a fifth aspect of the present invention, in the fluorescent display tube according to the third or fourth aspect, the display tube partitions are arranged at predetermined intervals of the grid.

According to a sixth aspect of the present invention, in the fluorescent display tube according to the fifth aspect, the partition for the display tube is a conductive coating applied to the inner surface of the flat plate with a predetermined width around a portion where the pedestal portion is located. It is fixed via the paste conductive electrode.

[0020]

FIG. 1 is a side view of a display tube partition according to the present invention, and FIG. 2 is a partial sectional view of a fluorescent display tube using the display tube partition.

The display tube partition 1 (1A) has a nail shape integrally formed of metal, and is made of, for example, an inexpensive soft iron nail. The display tube partition 1 is formed by integrally forming a disc-shaped pedestal portion 1a having a flat surface 1aa and a columnar column portion 1b vertically provided concentrically with respect to the pedestal portion 1a. The column portion 1b is formed in a columnar shape with a width h2 smaller than the outer diameter h1 of the pedestal portion. Column 1b
Has a beveled tapered shape and a sharp tapered shape.

The display screen partition 1 constructed as described above.
Is applied to the fluorescent display tube 2 shown in FIG. The fluorescent display tube 2 has an envelope 3 whose inside is maintained in a high vacuum state, and has a structure in which various electrodes and the like are housed inside.

The envelope 3 has an anode substrate 4 made of a glass substrate, a flat plate 5, and a side plate (not shown). The envelope 3 includes an anode substrate 4 having an insulating property;
An insulating and translucent flat plate 5 is sealed at a predetermined distance d1 by a sealing agent at an outer peripheral portion via an insulating side plate, and the inside is evacuated to a high vacuum state to maintain airtightness. Have been.

On the inner surface of the flat plate 5, a transparent conductive film 6 of ITO, SnO ₂ or the like is applied in a solid shape. An anode conductor 7 of Al or the like is formed on the inner surface of the anode substrate 4, and a phosphor layer 8 is formed on the anode conductor 7 to form an anode 9.

A conductive paste 6a is applied to the inner surface of the anode substrate 4 at a position adjacent to and separated from the anode 9. The conductive paste 6a is made of, for example, a graphite paste (graphite electrode), and its coefficient of thermal expansion is set to an intermediate value between the glass constituting the anode substrate 4 and the metal constituting the display tube partition 1. A grid 10 is provided above the anode 9, and a filament-shaped cathode 11 is provided above the grid 10.

The display screen partition 1 is located between the anodes 7 adjacent to each other with the pedestal portion 1a adjacent to the inner surface of the flat plate 5 (the surface of the transparent conductive film 6) in the process of assembling the fluorescent display tube 2. The flat surface 1aa of the pedestal portion 1a is placed upright so as to be in contact with the conductive paste 6a, and the envelope 3 is assembled and fired, so that the conductive paste 6 is hardened and fixed.

By the way, the display screen partition 1A shown in FIG.
Has a tapered shape with a sharp tip, but may have a configuration shown in FIG. That is, in the display tube partition 1B (1) shown in FIG. 3, the ends of the pedestal portion 1a and the column portion 1b are pressed from both sides by presses (not shown), and a flat surface 1ba is formed at the end of the column portion 1b. . Thereby, the dimensional accuracy in the length direction of the display tube partition is improved.

When the display tube partition 1B shown in FIG. 3 is applied to the fluorescent display tube 2 shown in FIG. 4, the display tube partition 1B is used.
B denotes a flat surface of the pedestal portion 1a such that the pedestal portion 1a is located between the adjacent anodes 7 and 7 and the flat surface 1ba of the pillar portion 1b is in contact with the inner surface of the flat plate 5 (the surface of the transparent conductive film 6). Surface 1a
a is positioned on the conductive paste 6a and is erected.
By assembling and firing, the conductive paste 6 is hardened and fixed. The configuration of the fluorescent display tube 2 shown in FIG. 4 is the same as that shown in FIG.

In the display tube partition 1 (1A, 1B) shown in FIGS. 1 and 3, the tip portion of the column portion 1b is formed in a tapered shape to have a tapered shape, but the tip portion is chamfered in a polygonal shape. Alternatively, as shown in FIG. 5, a pillar 1bb having a diameter smaller than the outer diameter h2 of the pillar 1b may be formed integrally with the tip of the pillar 1b to have a tapered shape having a step.

Further, the display screen partition 1 shown in FIGS.
When (1A, 1B) is applied to the fluorescent display tube 2 having the configuration shown in FIGS. 2 and 4, the flat surface 1aa of the pedestal portion 1a is connected to the flat plate 5 via the conductive paste 6 applied to the inner surface of the flat plate 5. 5, the envelope 3 is assembled so as to sandwich the display tube partition 1 between the anode substrate 4 and the flat plate 5, and the display tube partition 1 is applied to the anode substrate 4 without applying the conductive paste 6. 4 and the flat plate 5 may be fixed.

Further, the display tube partition 1 (1A, 1B)
The pedestal portion 1a is made of an organic adhesive instead of the conductive paste 6.
The flat surface 1aa may be fixed by baking in a state of being temporarily bonded to the inner surface of the flat plate 5.

Next, the configuration of a large-sized graphic fluorescent display tube using the display tube partition according to the present invention will be described.
6 is a plan view showing the appearance of the fluorescent display tube, FIG. 7 is a partially enlarged plan view of the fluorescent display tube on the anode substrate side, and FIG.
9 is a plan view schematically showing the internal structure of the fluorescent display tube. FIG. 10 is an enlarged sectional view taken along the line AA of FIG. 6, and FIG. 11 is an enlarged sectional view taken along the line BB of FIG. FIG. 12 is a cross-sectional view, and FIG. 12 is a partially enlarged plan view of the inner surface of the flat plate of the fluorescent display tube.

This large graphic fluorescent display tube 12
An envelope 13 having a larger outer size than a general fluorescent display tube
have. The envelope 13 has a structure in which the inside is held in a high vacuum state and various electrodes and the like are housed inside.

As shown in FIG. 10, the envelope 13 has an anode substrate 14 made of a glass substrate, a flat plate 15, and a side plate (not shown), similarly to a general fluorescent display tube. The envelope 13 is formed by a sealing agent between an anode substrate 14 having an insulating property and a light transmitting property and a plane plate 15 having an insulating property at a predetermined interval d2 via a side face plate having an insulating property at an outer peripheral portion. It is sealed, the inside is evacuated to a high vacuum state, and is kept airtight.

As shown in FIG. 8, strip-shaped crossover layers (hereinafter, referred to as insulating layers) 16 made of an insulating material are formed on the inner surface of the anode substrate 14 in parallel at predetermined intervals. On the insulating layer 16, a plurality of grids 17 are arranged in a matrix at right angles to the insulating layer 16. Each grid 17 is composed of a linear electrode made of, for example, a metal wire having a circular cross section, and is stretched and arranged so as to apply a constant tension in a state of being in contact with the surface 16 a of the insulating layer 16.

Anodes 18 constituting a display pattern are formed at predetermined pitch intervals between the insulating layers 16. The anode 18 includes a light-transmitting anode conductor 19 such as ITO or SnO ₂ formed on the inner surface of the anode substrate 14, and a phosphor layer 20 formed on the anode conductor 19.

Specifically, as shown in FIGS. 7 and 8,
On the inner surface of the anode substrate 14 between each of the insulating layers 16, three translucent strip-shaped anode conductors 18 are provided.
a, 18 b and 18 c are formed in parallel with the insulating layer 16. On each of the anode conductors 18a, 18b, 18c, a phosphor layer 20 having a different emission color, for example, a red phosphor layer 20a, a green phosphor layer 20b, and a blue phosphor layer 20c are formed in this order. Have been. Each anode 18
The height H2 is set lower than the height H1 of the insulating layer 16. As a result, each anode 18 is provided without contacting the grid 17 provided on the insulating layer 16.

The phosphor layer 20 formed on the anode conductor 19 does not necessarily have to be of three colors. For example, a phosphor layer of two colors of red and blue or a phosphor layer of a single color may be used. Good.

At a position above the grid 17 by a predetermined distance,
A plurality of cathodes 21 for emitting electrons toward the grid 17 are provided. Each cathode 21 is formed in the shape of a filament having a circular cross section, and is supported by a support member (not shown) disposed at both ends of the anode substrate 14 in a state where a certain tension is applied to the cathode 21 at right angles to the grid 17. Have been.

As shown in FIG. 9 to FIG.
A plurality of display tube screens 1 </ b> C (1) are regularly arranged at intervals of a predetermined number of grids 17 between and the flat plate 15. As the display tube partition 1C, the flat surface 1ba of the pillar portion 1b in the display tube partition 1B shown in FIG.
What formed the character groove 1bc is adopted.

Each display tube partition 1C is located at the point where the central axis of the column 1b intersects the grid 17 and the insulating layer 16, and the V-shaped groove 1bc is in contact with the surface 17a of the grid 17, and The flat surface 1aa of the portion 1a is fixed to the flat plate 15 via the conductive electrode 23. Thus, each display tube partition 1C is positioned by the V-shaped groove 1bc without slipping off the surface 17a of the grid 17, and the flat plate 1
5 and the grid 17.

The insulating layer 16 may be shifted from the center of the display tube partition 1C as long as the grid 17 and the anode 18 do not contact each other.

The conductive electrodes 23 are made of, for example, a conductive paste such as graphite paste, and are applied in paste form on the inner surface of the flat plate 15. As shown in FIG. 12, the display tube partitions 1C are provided. It is applied to the position in a circular shape by the area of the pedestal portion 1a, and is applied to the inner surface of the flat plate 15 in a solid shape with an annular space 23b having a predetermined width from the application portion 23a.

Thus, each display screen partition 1C is
It is arranged on conductive electrode 23 in a state of being electrically isolated across annular space 23b. The thermal expansion coefficient of the conductive electrode 23 is set to an intermediate value between the glass constituting the flat plate 15 and the metal constituting the display tube partition 1.

When the large-sized graphic fluorescent display tube 12 having the above configuration is manufactured, a graphite paste is applied to the flat plate 15 in advance so that the conductive electrodes 23 having the pattern shown in FIG. 12 are formed. Anode substrate 14
The insulating layer 16 is formed at predetermined intervals, and the insulating layer 1
An anode 18 forming a display pattern is formed between the six. Then, a plurality of grids 17 are arranged on the insulating layer 16 at predetermined intervals so as to be orthogonal to the insulating layer 16. The column portion 1b of the display tube partition 1C has a V
The groove 1bc is processed. Then, display screen partitions 1C are arranged every predetermined number of grids 17. This alignment is performed by the parts feeder and the mounting machine. Thereafter, the anode substrate 14 and the flat plate 15 are assembled together with the side plates to form the envelope 13, and firing is performed to fix the display tube partition 1C to the flat plate 15.

In the large-size graphic fluorescent display tube 12 thus manufactured, the anode substrate 14 and the flat plate 15 are enlarged by a plurality of display tube partitions 1C regularly arranged between the grid 17 and the flat plate 15. Hold against atmospheric pressure. To explain further, the externally applied atmospheric pressure is
A plurality of insulating layers 16 formed on the inner surface of the anode substrate 14
The force is distributed by a plurality of grids 17 provided in contact with the respective insulating layers 16, and the display screen partition 1C receives the ends at both ends.

In the large graphic fluorescent display tube 12, when the cathode 21 is heated to emit electrons, and two adjacent grids 17 are sequentially scanned and a positive voltage is applied, the electrons emitted from the cathode 21 are applied. Strikes the anode 18 under acceleration control by the grid 17,
The phosphor layer 20 of the anode 18 emits light by excitation. that time,
The display tube partition 1C in contact with the grid 17 to which the positive voltage is applied has the same potential as that of the grid 17, and the electrons emitted from the cathode 21 also reach around the tip of the display tube partition 1C. As a result, the display screen partition 1
Electrons also strike the anode 18 around the tip of C, and emit light with sufficient luminance without reducing the display area.

The large graphic fluorescent display tube 12
In this embodiment, a grid 17 made of metal wires having a circular cross section is provided orthogonal to the insulating layer 16. However, as shown in FIG. 13, a strip-shaped grid 24 having a flat surface 24 a is formed on each insulating layer 16. It may be formed in a layer on top. In this case, instead of the display tube partition 1C in which the V-shaped groove 1bc is formed at the tip of the pillar portion 1b, a display tube partition 1B shown in FIG. 3 is employed. At that time, the flat surface 1aa of the pedestal portion 1a of the display tube partition 1B is fixed to the flat plate 15 via the conductive electrode 23 in a state where the flat surface 1ba at the tip is in contact with the flat surface 24a of the grid 24.

According to each of the embodiments described above, the following effects can be obtained. (1) An inexpensive display screen partition 1 can be realized by simply applying an inexpensive nail material and a manufacturing method as it is, and only performing additional machining of the tip. (2) The dimensional accuracy of the display tube partition 1 can be improved only by pressing the ends of the pedestal portion 1a and the column portion 1b from both sides. (3) The display screen partition 1 has a pedestal 1 having a diameter larger than that of the column 1b.
Since there is a center of gravity on the a side, it is possible to stably stand on the substrate. (4) Since the display screen partition 1 is entirely made of metal, the tip can be processed into a desired shape with high precision and easy to handle, and when applied to a fluorescent display tube, the screen is assembled by an automatic machine. Therefore, high-speed and high-precision mounting is possible. (5) The display screen partition 1 is entirely made of metal and, when subjected to atmospheric pressure, flexes and absorbs shocks, so that a fluorescent display tube having high shock resistance and shock resistance is obtained. Can be. Further, it is possible to cope with a variation in height when a plurality of display tube screens are arranged in the envelope. (6) Since the display screen partition 1 made of metal, which is lighter than a conventional glass or ceramic support, is used, the substrate constituting the envelope can be made thinner, and the weight of the fluorescent display tube can be reduced. (7) Since the display screen partition 1 is entirely made of metal, unlike the conventionally used columns such as glass and ceramic, there is no generation of glass chips due to chipping and the yield of the fluorescent display tube is reduced. improves. (8) The display screen partition 1 applied to the illustrated fluorescent display tubes 2 and 12 is mounted on the flat plates 5 and 15 by being mounted inside, and after baking, the surface is oxidized and becomes black, so that there is little reflection. (9) Each display tube partition 1C (or 1B) applied to the illustrated large graphic fluorescent display tube 12 is electrically connected to the grid 17 in an individually isolated state.
Since the potential is the same as that of the grid 17 applied with the positive voltage, no charge-up of electrons occurs. (10) In the illustrated large graphic fluorescent display tube 12,
Electrons emitted from cathode 21 are used for display screen partition 1C.
Since it reaches the periphery of the tip portion of the (or 1B) pillar portion 1b, the anode 18 can be formed around the periphery of the tip portion of the display tube partition 1C (or 1B), and the light emitting area can be increased.

Incidentally, the display screen partition 1 (1A to 1C) in the above embodiment uses the filamentary cathode 11 (21) as an electron source and the translucent anode substrate 4
(14) The case where the present invention is applied to a front emission type fluorescent display tube for observing light emission from the side has been described.
(15) It can be applied to a fluorescent display tube for observing light emission from the side.

[0051]

As is apparent from the above description, according to the present invention, an inexpensive display screen partition can be provided only by additionally processing the tip as needed. The display tube screen is
Since the center of gravity is located on the side of the pedestal part having a larger diameter than the pillar part, it is possible to stably stand on the substrate. Since the display screen partition is entirely formed of a metal member, the tip can be processed into a desired shape with high precision and easy to handle, and when applied to a fluorescent display tube, the screen can be assembled by an automatic machine. Therefore, high-speed and high-precision mounting becomes possible.
Since the display screen partition is entirely made of a metal member and bends when an atmospheric pressure is applied to absorb a shock, it is possible to obtain a fluorescent display tube having high shock resistance and high shock resistance. Further, it is possible to cope with a variation in height when a plurality of display tube screens are arranged in the envelope. Further, unlike the conventionally used columns such as glass and ceramic, there is no generation of glass chips due to chipping, and the yield of the fluorescent display tube is improved. Each display tube partition is electrically connected to the grid in a state of being individually isolated, and is kept at the same potential as the grid to which a voltage is applied, so that it is possible to prevent the occurrence of electron charge-up. . In addition, since the electrons emitted from the cathode reach the periphery of the tip of the display screen partition, the anode can be formed around the periphery of the tip of the display tube screen, and the light emitting area can be increased.

[Brief description of the drawings]

FIG. 1 is a side view of a screen for a display tube according to the present invention.

FIG. 2 is a partial sectional view of a fluorescent display tube using the display tube screen of FIG.

FIG. 3 is a side view showing another embodiment of the display tube partition according to the present invention.

FIG. 4 is a partial cross-sectional view of a fluorescent display tube using the display screen partition of FIG. 3;

FIG. 5 is a side view showing another embodiment of the screen for a display tube according to the present invention.

FIG. 6 is a plan view showing the appearance of a large-sized graphic fluorescent display tube using the display screen partition according to the present invention.

FIG. 7 is a partially enlarged plan view of the large-sized graphic fluorescent display tube on the anode substrate side.

FIG. 8 is an enlarged side sectional view of FIG. 7;

FIG. 9 is a plan view schematically showing an internal configuration of the large-sized graphic fluorescent display tube.

FIG. 10 is an enlarged sectional view taken along line AA of FIG. 6;

11 is an enlarged sectional view taken along the line BB of FIG. 6;

FIG. 12 is a partially enlarged plan view of the inner surface of the flat plate of the fluorescent display tube.

FIG. 13 is a partial cross-sectional view showing another embodiment of a large-size graphic fluorescent display tube using a display tube partition according to the present invention.

FIG. 14 is a cross-sectional view of a conventional fluorescent display tube using rectangular parallelepiped glass columns.

FIG. 15 is a cross-sectional view of a conventional fluorescent display tube using a conical glass column.

16A and 16B are cross-sectional views of a conventional fluorescent display tube using a thin metal column.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 (1A, 1B, 1C) ... screen tube partition, 1a ... pedestal part, 1b ... pillar part, 2 ... fluorescent display tube, 3 ... envelope, 4 ... anode substrate, 5 ... flat plate, 7 ... anode conductor, 8 phosphor layer, 9 anode, 10 grid, 11 cathode, 12 large graphic fluorescent display tube, 13 envelope, 14 anode substrate, 15 flat plate, 16 insulating layer, 17 grid , 18: anode, 19: anode conductor, 20: phosphor layer, 21: cathode, 23: conductive electrode, 24: grid.

Claims (6)

[Claims] 1. A display tube screen which is disposed in an envelope hermetically sealed by sealing the outer peripheral portions of two substrates opposed to each other at a predetermined interval, wherein one of said substrates is provided. A pedestal portion made of a metal member having a flat surface that comes into contact with the inner surface of the substrate; and a pedestal portion made of the same metal member integrated with the pedestal portion. A partition for a display tube, comprising a tapered pillar portion to be in contact with the partition. 2. An outer peripheral portion of an anode substrate having a display pattern formed on an inner surface thereof and a flat plate opposed to the anode substrate at a predetermined interval is sealed to keep the inside airtight in a high vacuum state. An anode, a cathode provided in the envelope for emitting electrons, a grid provided above the display pattern, for accelerating and controlling electrons emitted from the cathode, and the anode substrate A substantially disk-shaped pedestal portion made of a metal member having a flat surface in contact with an inner surface of the pedestal portion, and the same metal member integral with the pedestal portion, the pedestal portion being vertically provided on the pedestal portion, and a tip positioned between the display patterns. And a screen for a display tube having a tapered column contacting the inner surface of the anode substrate. 3. An anode substrate having a plurality of strip-shaped insulating layers formed at predetermined intervals on an inner surface thereof, and a display substrate having a display pattern formed between the insulating layers, and a flat substrate disposed to face the anode substrate at a predetermined interval. An outer package that seals the outer peripheral portion with the face plate and hermetically maintains the inside in a high vacuum state; a cathode provided in the outer package, for emitting electrons; and an abutment on the insulating layer. A linear grid for accelerating and controlling electrons emitted from the cathode; a substantially disk-shaped pedestal portion made of a metal member having a flat surface in contact with an inner surface of the flat plate; A display screen partition which is made of the same metal member as described above, and has a tapered pillar portion which is vertically provided on the pedestal portion and whose tip abuts on the grid. 4. The fluorescent display tube according to claim 3, wherein the grid comprises a linear electrode having a circular cross section, and a V-shaped groove is formed at a tip of a column portion of the display tube partition which comes into contact with the grid. . 5. The fluorescent display tube according to claim 3, wherein the display tube screens are arranged at predetermined intervals of the grid. 6. The display tube screen according to claim 5, wherein the display screen partition is fixed via a conductive electrode of a conductive paste applied to an inner surface of the flat plate with a predetermined width around a portion where the pedestal portion is located. Fluorescent display tube.