KR100296725B1 - Fluorescent display device and method for manufacturing same - Google Patents

Abstract

(Problem) The number of parts is reduced, the cost is reduced, and the grid space on the display surface is reduced.

(Solution means) A strip-shaped anode 7 having a phosphor 7b is formed at a predetermined interval on the surface of the substrate 2 constituting the box-like envelope 1. At both ends of the surface of the substrate 2, a projection grid spacer 8 having crystallized insulation is formed between the side plate 4 constituting the envelope and the anode 7 located at the outermost edge thereof. It is deposited in parallel with. The plurality of wire grids 9 face the anode 7 in a state where both ends thereof contact the surface of the grid spacer 8 and the distance H from the anode 7 is kept constant. It is provided on the board | substrate 2 in the inside at predetermined intervals.

Description

Fluorescent display tube and manufacturing method thereof {FLUORESCENT DISPLAY DEVICE AND METHOD FOR MANUFACTURING SAME}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluorescent display tube having a wire grid composed of a plurality of fine metal wires and performing a desired graphic display, and a method of manufacturing the same.

3 and 4 show an example of the configuration of a conventional general fluorescent display tube for performing graphic display. On the board | substrate 22 which forms a part of box-shaped envelope 21, the some strip | belt-shaped anode 24 with which the fluorescent substance 23 was deposited is formed in predetermined space | interval. In the envelope 21, a wire grid 25 made of a plurality of fine metal wires is provided above the anode 24 in a direction intersecting with the anode 24. Above the wire grid 25, a filamentary cathode 26 which emits electrons is provided.

In the fluorescent display tube configured as described above, two adjacent adjacent grids of wires 25 are scanned while shifting one by one, and a display signal synchronized with this is applied to the anode 24. When electrons are emitted from the cathode 26 on the filament, the emitted electrons are rounded to a small area on the anode 24 sandwiched by the two wire grids 25 to emit the phosphor 23 to obtain a desired graphic display. Lose.

By the way, in this type of fluorescent display tube, the wire grid 25 has a constant value of 0.15 to 0.4 mm between the anodes 24 in order to keep the luminance at each of the anodes 24 constant. For example, 0.2 mm) and is placed on the substrate 22.

If the distance H between the anode 24 and the wire grid 25 is large, the luminance of the portion of the anode 24 is higher than that of the other portions of the anode 24. In contrast, if the value of the distance H is small, the luminance of the portion of the anode 24 is lower than that of other portions of the anode 24. In this way, since the difference in the distance H between the anode 24 and the wire grid 25 directly affects the brightness of the anode 24 portion, the wire grid 25 of each of the anodes 24 may be separated. It was necessary to keep the height constant.

Here, in the conventional fluorescent display tube, as shown in FIGS. 3 and 4, the wires are separated by the spacer glass 28 positioned at both ends of the substrate 22 through the stopper 27 in parallel with the strip-shaped anode 24. The structure which floats both ends of the grid 25 from the board | substrate 22 to a predetermined height, and installs it.

Further, the stopper 27 is made of a pair of low melting glass, respectively formed at both ends of the substrate 22 at predetermined intervals, such as to regulate the position of both sides of the spacer glass 28. The interval between each stopper 27 is set slightly larger than the width of the spacer glass 28. Each pair of stoppers 27 made of low melting glass is formed on the substrate 22 in parallel with the strip-shaped anode 24 and lower than the spacer glass 28 to form the anode 24. It is plastic so that it does not adhere.

And when the wire grid 25 is mounted on the board | substrate 22, the spacer glass 28 is mounted between each pair of stoppers 27 by the plasticized low melting glass. In this state, the wire grid 25 is mounted on the spacer glass 28. And the container part 32 which consists of the front plate 30 and the side plate 31 is mounted on the board | substrate 22, it heat-fires, and the outer peripheral part of the container part 32 is sealed. As a result, the wire grid 25 is mounted on the substrate 22 with the height from the anode 24 kept constant by the space glass 28.

However, the above-mentioned conventional fluorescent display tube has various problems shown below. Since the spacer glass 28 used to hold the wire grid 25 at a constant height has a thin plate thickness, its own processing, for example, a flow method, is required to keep the thickness constant. 28) There is a problem that the cost is high because it is formed of a special glass itself.

The width of the spacer glass 28 is required to be at least 2 to 3 mm in consideration of the handling property when automatically mounting on the substrate 22, and when formed thinner than this value, the handling property is not only deteriorated, but also the handling. It was difficult to do it, and there were problems such as being broken and broken.

Since a pair of stoppers 27 are separately formed at both ends of the substrate 22 on which the spacer glass 28 is placed to prevent misalignment of the spacer glass 28, there is a problem that the work process increases by that amount. In addition, an excretion space of 2 to 3 mm for the spacer glass 28 and 1 to 2 mm for each stopper 27 is required. For this reason, on the board | substrate, the distance L3 from the inner wall surface of the side plate 30 to the anode 24 located in the outermost edge should be empty at least 6 mm or more, and an amount of excretion space is required by that amount, and There was a problem of becoming a dead space.

Since the spacer glass 28 is not completely fixed to the substrate 22 until the container portion 31 is formed on the substrate 22 after the firing process, the spacer glass 28 may be displaced due to an impact from the outside during transportation. In this case, the distance H between the anode 24 and the wire grid 25 may be shifted.

Both ends of the wire grid 25 are mounted on the substrate 22 by being held at a predetermined height by the spacer glass 28, but the spacer glass 28 is in the shape of a column, so that the wire grid 25 is in contact with the wire grid 25. The part was peeled off by the tension of the wire grid 25, and there was a problem in that powdery glass debris was generated, and the glass debris became dust, which degraded the display quality and quality, thereby producing a defective fluorescent display tube.

Therefore, the present invention has been made in view of the above problems, the cost of the parts can be reduced by reducing the number of parts, and the dead space of the display surface can be reduced, and the position of the display is not caused by the impact from the outside. It is an object of the present invention to provide a fluorescent display tube and a method of manufacturing the same, which are manufactured by simplifying the work process without degrading the quality.

1 is a partially enlarged planar cross-sectional view when the fluorescent display tube showing one embodiment of the present invention is viewed from above;

2 is a partially enlarged planar cross-sectional view of the fluorescent display tube of FIG.

3 is a partially enlarged cross-sectional view of a conventional fluorescent display tube when viewed from above;

4 is a partially enlarged cross-sectional view of the fluorescent display tube of FIG. 3 viewed from the side;

(Explanation of symbols on the main parts of drawing

1: Envelope 2: Board 3: Front panel

4: side plate 5: container 7: anode

7b: phosphor 8: grid spacer 9: wire grid

In order to achieve the above object, the invention of claim 1 faces an anode having a box-shaped envelope made of a substrate and a container portion and a phosphor formed on the surface of the substrate in the envelope and the anode, and at the same time between a predetermined distance. A fluorescent display tube having a plurality of wire grids arranged at predetermined intervals on the substrate in the envelope, wherein an insulating grid spacer contacts both ends of the wire grid to the surface of the substrate in the envelope. It is characterized in that the adherence formed.

In the fluorescent display tube of claim 1, the anode is formed in a band shape in a direction crossing the wire grid, and the grid spacer is formed between the anode and the side plate positioned at the outermost edge of the anode. It is characterized in that the printed surface formed by a projection on the surface of the substrate.

The invention according to claim 3 is characterized in that in the fluorescent display tube of claim 1 or 2, the grid spacer has a curved contact surface with the wire grid.

The invention according to claim 4, wherein in the fluorescent display tube according to any one of claims 1 to 3, the grid spacer is mainly composed of crystallized sugar, and a low melting point glass, a softening point, and a mixed material of pigment and vehicle are printed on the surface of the substrate. And an insulating member fired.

The invention of claim 5 is characterized by a box-shaped envelope consisting of a substrate and a container portion and an anode having a phosphor formed on the surface of the substrate in the envelope and the anode facing the anode and at the same time placed on the substrate in the envelope. In the method of manufacturing a fluorescent display tube having a plurality of wire grids provided at predetermined intervals, a paste-shaped insulating member containing crystallized glass is formed on the surface of the substrate, and then the insulating member is baked to crystallize the grid. A spacer is formed on the surface of the substrate, the plurality of wire grids are arranged to contact the upper surface of the grid spacer, and a container portion on the lid made of a front plate and a side plate in a state where tension is given to each of the wire grids. A process of sealing the outer circumference by mounting on the substrate And it characterized in that.

In the manufacturing method of the fluorescent display tube of Claim 5, the said insulating member consists of crystallized glass as a main component, and consists of a low melting point glass with a high softening point, and a mixed material of a pigment and a vehicle.

According to a seventh aspect of the present invention, in the method of manufacturing a fluorescent display tube of claim 5 or 6, the insulating member is baked at 440 to 560 ° C.

1 is a partially enlarged planar cross-sectional view of a fluorescent display tube showing an embodiment of the present invention when viewed from above, and FIG. 2 is a partially enlarged cross-sectional view of the fluorescent display tube of FIG.

The fluorescent display tube according to this embodiment has an envelope 1 in which the inside is kept in a high vacuum state, and has a structure in which various electrodes and the like are housed therein.

The envelope 1 is made up of a lid portion 5 formed of a substrate (anode substrate) 2, a front plate 3, and a side plate 4. On the inner surface of the board | substrate 2, the base seal 6 for sealing is provided in the frame continuously in the outer peripheral part used as the sealing part of the envelope 1. As the base seal 6, a paste-like low melting glass is used, and after plastic-printing on the outer peripheral part of the envelope 1, it is plasticized.

On the inner surface of the substrate 2, a plurality of strip-shaped anodes 7 are formed at predetermined intervals along the longitudinal direction. Each anode 7 consists of an anode conductor 7a formed on the substrate 2 and a phosphor 7b deposited on the anode conductor 7a.

In addition, the anode conductor 7a is formed of a thin film of A1 when constituting a fluorescent display tube for observing display on the front plate 3 side, and constitutes a fluorescent display tube for observing display on the substrate 2 side. In this case, the film is formed of an ITO thin film having transparency. In addition, although the phosphor 7b is formed in the beta phase on the anode conductor 7a, when it corresponds to the space | interval of the wire grid 9 mentioned later, it is partial (for example, the space | interval of the wire grid 9). Every other).

As shown in FIG. 1, a protruding grid spacer 8 is formed on the surface of both sides of the substrate 2 with a predetermined distance L1 interposed therebetween from the inner wall surface of the longitudinal side plate 4. It is. In other words, the grid space 8 is formed of a printing pattern made of an insulating material, and the anode 7 is disposed between the side plate 4 with a predetermined distance L2 from the anode 7 positioned at the outermost edge. Is formed in parallel with The grid spacer 8 is based on crystallized glass as a material, and is formed into a paste by mixing a low melting glass, a vehicle, and a pigment. The grid spacer 8 is blackened using a black pigment to improve the contrast.

When the grid spacer 8 is composed of only crystallized glass when viewed as a solid content, the gas of the vehicle is hard to escape, and projections are generated by bubbles, so that the uniformity of the height is impaired. It consists of low melting glass with a softening point of 500% or higher.

When the grid spacer 8 is formed on the substrate 2, the screen printing method is applied. In that case, a metal screen made of a metal thin plate is used as the screen. The methyl screen is formed with an opening punched into the outer shape of the grid spacer 8 by etching.

In forming the grid spacer 8 on the substrate 2, an opening is placed at the position where the grid spacer 8 is formed, and the metal screen is mounted on the substrate 2, and paste-like materials (crystallized glass and low melting point glass) are formed. And the openings are filled with a mixture of a vehicle and a pigment), and excess material protruding from the openings is removed along the surface of the metal screen, and the surface of the material in the opening is flush with the surface of the metal screen. .

As a result, a paste-like grid spacer 8 forming a columnar shape is thickly printed at a predetermined position on the substrate 2. In this state, since the grid spacer 8 is paste-like, it is then baked at 440 to 560 ° C and completely crystallized. Thus, the grid spacer 8 is fixed on the substrate 2 without remelting in the firing step in the case of assembling the fluorescent display tube.

Here, the grid spacer 8 is uniform in height due to the thickness of the metal screen. However, when the grid spacer 8 is baked and crystallized from the paste state, the surface of the grid spacer 8 is uniformly reduced, as shown in FIG. The same curved shape is obtained. For this reason, the plate | board thickness of a metal screen is set in consideration of the reduced amount at the time of baking so that a desired height may be obtained when the grid spacer 8 crystallizes.

Above the anode 7 in the envelope 1, a wire grid 9 made of a plurality of fine metal wires is disposed at predetermined intervals in a direction crossing the anode 7 (in the drawing, a direction orthogonal to the anode 7). It is. In other words, each wire grid 9 has its both ends in contact with the surface of the grid spacer 8, and the distance H between the anodes 7 is constant (a predetermined value of 0.15 to 0.4 mm, for example, 0.2). It is installed on the board | substrate 2 in the state maintained at mm. Above the wire grid 9, it is provided in the filamentary cathode 10 which discharges an electron.

In the fluorescent display tube having the above structure, two adjacent adjacent grids 9 are scanned while shifting one by one, and a display signal synchronized with this is applied to the anode 7. When electrons are emitted from the cathode 10 on the filament, the emitted electrons turn around in a small region on the anode 7 sandwiched by two wire grids 9 to emit the phosphor 7b, so that the desired graphic display is obtained. Obtained.

Next, the manufacturing method of the fluorescent display tube comprised as mentioned above is demonstrated. First, the substrate 2 on which the anode 7 is formed is cleaned. Next, the wiring conductor and the plurality of strip-shaped anode conductors 7a are formed on the upper surface of the substrate 2 by an Al thin film by the photolithography method. The base seal 6 as a sealing material is deposited around the upper surface of the board | substrate 2 in a frame shape by the printing method. The base seal 6 is plasticized so that the phosphor 7b does not adhere. Next, by the printing method, the phosphor 7b is deposited on the anode conductor 7a to form a strip-shaped anode 7.

Next, the grid spacer 8 according to the above screen printing method is placed on the surfaces of both shaft portions of the substrate 2 with a predetermined distance L1 inward from the inner wall surface (base seal 6) of the side plate 4. Print forms. Since the printed grid spacer 8 is paste-like, it is then baked at 440 to 560 캜, completely crystallized and fixed on the substrate 2.

Next, the wire grid 9 attached to the jig is placed in contact with the upper surface of the grid spacer 8, pulled outward, and given a predetermined tension. In this state, the position of the board | substrate 2 is adjusted in order to align the pattern of the wire grid 9 mounted on the jig side with the strip | belt-shaped anode 7. Next, the filamentary cathode 10 is provided above the wire grid 9. Then, the lid-like container portion 5 composed of the front plate 3 and the side plate 4 is mounted on the substrate 2, heated and fired and sealed by the base seal 6.

As described above, according to the above embodiment, each wire grid 9 has a constant distance H from the anode 7 in a state in which both ends thereof contact the grid spacer 8 mainly composed of crystallized glass fixed to the substrate 2. It is held and mounted on the board | substrate 2.

Therefore, since the components for maintaining the wire grid 9 at a constant height end only with the grid spacers 7, the component scores are reduced and the material cost is reduced as compared with the conventional fluorescent display tubes shown in FIGS. 3 and 4. In addition, the configuration can be simplified. In addition, since the components are reduced, the distance L3 from the inner wall surface of the side plate 4 to the anode 7 located at the outermost edge becomes 6 mm to 3 mm or less in the prior art, and the dead space on the display surface is reduced. It can be made smaller than the width of the conventional fluorescent display tube.

In addition, when the display area is the same size as the conventional fluorescent display tube, the external dimension of the envelope 1 can be made smaller by the amount of the dead space on the substrate 2 as compared with the conventional fluorescent display tube. Therefore, the fluorescent display tube can be miniaturized.

Since the grid spacer 8 is crystallized and deposited on the substrate 2, the envelope 1 is applied after the wire grid 9 is pasted without remelting in the firing step when assembling the fluorescent display tube. The grid spacer 8 may be out of position due to impact from the outside during sealing.

In the conventional fluorescent display tube, after forming a pair of stoppers on the substrate, the spacer glass was placed between the stoppers to attach the wire grids. In the above-described embodiment, the grid spacers are printed on the substrate 2. After forming, since the wire grid 9 can be pasted, the work process can be reduced compared to the conventional fluorescent display tube and the work can be simplified.

Since the surface of the grid spacer 8 is crystallized and fixed on the substrate 2, the surface is curved, so that debris is hardly generated due to the tension of the wire grid 9, resulting in deterioration of display quality or quality. Viscosity of generation of defective products can be significantly reduced as compared with the prior art.

As apparent from the above description, according to the present invention, since the component for maintaining the wire grid at a constant height ends only with the grid spacer, the component score is reduced and the material cost is reduced as compared with the conventional fluorescent display tube to simplify the configuration. It can be planned. In addition, the dead space can be reduced on the substrate by the amount of the component parts reduced as compared with the conventional fluorescent display tube.

Since the grid spacer is crystallized and deposited on the substrate, the grid spacer can be fixed and deposited on the substrate, without re-melting in the firing process when assembling the fluorescent display tube, and from the outside after the wire grid is attached to the enclosure. The grid spacer does not cause position shift due to the impact.

Since the surface of the grid spacer has a curved shape, debris is hardly generated even when peeled off due to the tension of the wire grid, and the degree of generation of defective products due to deterioration of display quality or quality can be greatly reduced as compared with the prior art.

In the conventional fluorescent display tube, a pair of stoppers were formed on a substrate, and then the spacer grid was placed between the stoppers to attach the wire grids. However, after forming the grid spacers on the substrate, the surface of the wire grids was formed. Since it can attach, the work process can be reduced compared with the conventional fluorescent display tube, and work can be simplified.

Claims (7)

An anode having a box-shaped envelope made up of a substrate and a container portion and a phosphor formed on the surface of the substrate in the envelope and the anode faced to each other and at a predetermined distance and mounted on the substrate in the envelope at predetermined intervals. A fluorescent display tube having a plurality of wire grids, wherein an insulating grid spacer is formed on the surface of the substrate in the envelope by contacting both ends of the wire grid. The anode of claim 1, wherein the anode is formed in a band shape in a direction crossing the wire grid, and the grid spacer is formed by a protrusion on the surface of the substrate between the anode located at the outermost edge of the anode and the side plate. Fluorescent display tube, characterized in that. The fluorescent display tube according to claim 1 or 2, wherein the grid spacer has a curved contact surface with the wire grid. The method according to claim 1 or 2, wherein the grid spacer is composed of an insulating member obtained by printing a mixed material of a low melting point glass, a high softening point, a pigment, and a vehicle on the surface of the substrate, and having a crystallized glycine as a main component. Characterized in fluorescent display tube. An anode having a box-shaped envelope formed of a substrate and a container portion and a phosphor formed on the surface of the substrate in the envelope and the anode faced to each other at a predetermined distance, and mounted on the substrate in the envelope at predetermined intervals. In the method of manufacturing a fluorescent display tube having a plurality of wire grids, a paste-shaped insulating member containing crystallized glass is formed on the surface of the substrate, and then the grid spacer obtained by baking the insulating member is crystallized. A plurality of wire grids are formed on the surface, and the plurality of wire grids are disposed so as to contact the upper surface of the grid spacers, and a container portion on the lid made of a front plate and a side plate is placed on the substrate in a state where tension is given to each of the wire grids. Then it comprises a step of sealing the outer peripheral portion Method for manufacturing a vacuum fluorescent display that. The method of manufacturing a fluorescent display tube according to claim 5, wherein the insulating member is mainly composed of crystallized glass, and is made of a low melting point glass having a high softening point, and a mixed material of a pigment and a vehicle. The method of manufacturing a fluorescent display tube according to claim 5 or 6, wherein the insulating member is fired at 440 to 560 占 폚.

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