JP2006024405A - Fluorescent display tube - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fluorescent display tube capable of independently driving luminous patterns arranged with high display density, of which, arraying intervals between grids fitted in correspondence with positive electrodes for controlling drive of the positive electrodes are made small, capable of displaying in high density. <P>SOLUTION: In the fluorescent display tube, a tip part of a support tab is arranged so that its cross section contacts an insulating base board 110, and a connection part formed at the tip part of the support tab molded is coated with a grid fixing material 240 arranged at the insulating base board 110 to fix it to the insulating base board. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a fluorescent display tube having an improved grid electrode used for a fluorescent display tube, and particularly to a grid structure in which a plurality of grids are integrally formed in the same frame, and is capable of increasing the density of the light emitting part pattern of the anode. The present invention relates to a fluorescent display tube whose display range is expanded by narrowing the interval between grids.

  As shown in FIG. 8, the fluorescent display tube has an envelope 100 whose inside is maintained in a high vacuum state. Inside the envelope, a wiring 120 is formed on the upper surface of an insulating substrate 110 made of a glass plate constituting a part of the envelope, and an insulating coating 130 in which a through hole 140 is provided in a desired portion of the wiring. The upper surface anode electrode 150 of the insulating coating 130, and the phosphor 160 are sequentially stacked on the upper surface of the anode electrode. Further, the grid 200 is disposed above the phosphor 160, and the filament 310 is disposed above the grid 210. Has been.

As shown in FIGS. 5 and 6, the grid 200 is molded into the shape of a hat-shaped cross section, and the portion corresponding to the top of the hat-shaped cross section has a mesh-like grid 210 as the insulating substrate. 110 is formed in an L shape with the mesh-like grid 210 as a long side and a support tab leg portion 230 provided around the previous period grid as a short side. The lower end of the leg part 230 is formed in an L shape so as to be a hat-shaped edge with an edge, and a claw 237 is formed to ensure the fixing of the indication tab that increases the contact area with the insulating substrate. .
With the claw portion 237 of the support tab 220 as a short side, the contact surface 238 of the L-shaped claw portion 237 is fixed by a grid electrode fixing material so as to be substantially parallel to the insulating substrate surface 111. (For example, Patent Document 1)

  The grid 200 disposed above the phosphor 160 uses a grid structure as schematically shown in FIG. In this grid structure, a plurality of grids 200 are fixedly connected to each other inside a frame (frame-like body) 600 by a connecting portion (not shown). In producing a fluorescent display tube using a grid structure, each grid is first separated and held in a holding mold having a holding portion corresponding to each grid. The holding mold is provided with a magnet, and each separated grid is held in a predetermined arrangement. Next, the tab of each grid held by the holding mold is bent by a press to form a support leg. The grid after processing is transported together with the holding mold onto the anode substrate on which the anode is formed in a separate process, aligned with the anode, and disposed and fixed on the anode substrate.

Japanese Patent Laid-Open No. 11-54032

Since the grid 200 has the claws 237 of the support tabs 220, the distance between adjacent grids is required by the support tab claws 236, and the area of the support tab claws 237 is increased by the fixing grid electrode fixing material. There is a need to. For this reason, the effective area between the anode electrodes has become narrow.
SUMMARY OF THE INVENTION An object of the present invention is to provide a highly reliable fluorescent display tube having an expanded display range that can be applied to a high-density anode arrangement by reducing the interval between adjacent grids.

The present invention has been made to solve the above-mentioned problems, and the invention of claim 1 includes an envelope 100 in which the inside is maintained in a high vacuum state, and an insulating property constituting a part of the envelope 100. An anode 150 in which a phosphor 160 is laminated on a substrate 110, and a support tab 220 that is integrally formed so as to protrude to the outside of the mesh electrode portion 210. In the fluorescent display tube having the grid 200 fixed to the substrate 110, the supporting tab 220 includes two or more claws 235 protruding outside the mesh electrode portion 210 with the mesh electrode portion 210 as a base end, The grid 200 has a mesh electrode part 210 as a long side and a part of the support tab 220 as a short side, and the short side is a leg. A grid electrode fixing material in which a distal end of the leg 230 is disposed in contact with the insulating substrate 110 and a connecting portion 231 of the supporting tab 220 is disposed on the insulating substrate 110. The grid 200 is fixed to the insulating substrate 110 by being covered with 240.
The connecting portion 231 at the tip of the support tab is disposed substantially in parallel with the insulating substrate and securely fixed to the insulating substrate via the grid electrode fixing material 240, and is conventionally molded to the insulating substrate. The nail | claw part 237 for adhering with the insulating board | substrate of the support tab 220 provided in contact is unnecessary, and the area of an anode electrode can be expanded.

The invention of claim 2 includes an envelope 100 in which the inside is maintained in a high vacuum state, an anode 150 in which a phosphor 160 is laminated on an insulating substrate 110 constituting a part of the envelope 100, and a mesh. A support tab 220 that is integrally formed so as to protrude outside the electrode portion 210 and a support tab 220 that is integrally formed in the mesh electrode portion 210 region. In the fluorescent display tube having the grid 200 fixed to the insulating substrate 110 as 230, the supporting tab has two or more claws protruding outside the mesh electrode portion with the mesh electrode portion as a base end; The supporting tab 220 includes two or more claws 235 projecting outside the mesh electrode portion 210 with the mesh electrode portion 210 as a base end, Less than The grid 200 has the mesh electrode part 210 as a long side, a part of the support tab 220 as a short side, and the short side as a leg part 230. The ends of the leg portions 230 are disposed in contact with the insulating substrate 110, and the connecting portions 231 of the support tabs 220 are covered with the grid electrode fixing material 240 disposed on the insulating substrate 110. The grid 200 is fixed to the insulating substrate 110.
A connecting portion 231 at the tip of the supporting tab 220 formed integrally in the region of the mesh-like electrode portion 210 is disposed substantially in parallel with the insulating substrate 110 and is insulated via the grid electrode fixing member 240. It is securely fixed to the substrate, and the conventional claw portion 237 for fixing the supporting tab to the insulating substrate is not necessary, so that the area of the anode electrode can be increased.

According to a third aspect of the present invention, in the fluorescent display tube according to the first or second aspect, the cross-sectional shape of the grid 200 and the insulative substrate 100 is the mesh-shaped grid surface 210 as an upper side, and the insulating substrate 110 is A trapezoidal shape is used as a base, and an angle formed between the mesh electrode 210 and the leg portion 230 is 90 degrees to 100 degrees.
The area of the anode electrode can be increased by setting the supporting tabs 220 to 90 degrees to 100 degrees with respect to the mesh-like grid surface.
The invention of claim 4 is characterized in that a projection 234 is provided on the outer side of the connecting portion of the support tab 220.
In addition to facilitating the insertion of the grid support tab 220 into the grid electrode fixing material 240 so that the cross-section of the tip of the tab is substantially parallel to the surface of the anode substrate, the grid support is further provided by having protrusions on the outside. The tabs 220 can be easily inserted into the grid electrode fixing material 240.
Further, by forming the intermediate connecting portion 233 between the connecting portion 231 at the tip of the tab and the mesh-like electrode portion 210, the strength of the tab is increased and a more reliable fluorescent display tube can be obtained.

  According to the present invention, the claw portion 234 (FIG. 5) provided at the tip of the support tab is eliminated, and the molding angle of the support tab 220 with respect to the mesh electrode portion 210 surface is reduced, so that adjacent grids can be connected to each other. Since the interval can be reduced, a fluorescent display tube that can be adapted to the arrangement of high-density anodes can be provided.

(Example 1) An example of a fluorescent display tube in which light emission is observed from the phosphor side that emits light by excitation of a low-speed electron beam from a filament.
In the fluorescent display tube according to the present invention, as shown in FIG. 1, a wiring 120 made of an aluminum thin film is patterned on the upper surface of an insulating substrate made of a glass plate, which is the insulating substrate 110, by photolithography. An insulating coating 130 provided with a through hole 140 is laminated on a desired portion of the wiring by a screen printing method. An anode electrode mainly composed of graphite is formed on the upper surface of the insulating coating 130 by screen printing so as to cover the through hole. A phosphor 160 that emits light upon receiving a low-speed electron beam from the filament 310 is laminated on the upper surface of the anode electrode by a screen printing method to complete the anode electrode. A grid 200 according to the present invention is disposed above the phosphor 160, and a filament 310 serving as an electron source is disposed above the grid 200.

The grid 200 is a metal part in which a plurality of supporting tabs 220 are integrally formed around a mesh electrode portion 210 as shown in FIG. In the present embodiment, the supporting tab 220 has three claws 235 as legs 230 and a connecting portion 231 at the tip. Further, an intermediate connecting portion 233 is provided between the connecting portion 231 and the mesh electrode portion 210 to prevent deformation of the supporting tab 220 as the leg portion 230 and increase the strength.
The supporting tab 220 is formed so that the mesh-shaped electrode portion 210 of the grid 200 is a long side and a part of the supporting tab 220 is formed to be a short side so that the cross-sectional shape is an L shape and the short side is formed. Let it be a leg part 230.
The grid 200 is arranged so that the mesh electrode portion 210 surface is substantially parallel to the anode electrode 150 and the cross section 232 at the tip of the support tab 220 is in contact with the insulating substrate 110. The connecting portion 231 formed at the tip of the molded supporting tab 220 is covered with the grid electrode fixing material 240 disposed on the insulating substrate and fixed to the insulating substrate 110.
The connecting portion 231 at the front end of the supporting tab is disposed substantially in parallel with the insulating substrate 110 and is securely fixed to the insulating substrate 110 via the grid electrode fixing member 240, thereby insulating the conventional supporting tab. The claw portion 235 for fixing to the conductive substrate is not necessary, and the area of the anode electrode can be increased.

  The support tab 220 has a configuration in which a connecting portion 231 is provided at the tip. The connecting portion 231 is disposed so that the cross section 232 of the supporting tab is in contact with the anode substrate. Since the grid material is obtained by processing a thin metal plate having a thickness of 0.05 to 0.1 mm, it is previously formed on the anode substrate in comparison with the claw portion 237 at the tip as the conventional support tab 220 (shown in FIG. 5). It can be easily sunk into the arranged grid electrode fixing material. Compared with the fixing with the grid electrode fixing material of the supporting tab 220 provided with the claw portion 237 of the conventional supporting tab, the connecting portion 231 at the distal end of the supporting tab 220 of the present invention is more securely connected via the grid electrode fixing material 240. Can be fixed to.

Further, since the support tab 220 has a configuration in which a connection portion 231 is provided at the tip, the connection portion at the tip of the support tab is covered with the grid electrode fixing material 240 disposed on the anode substrate. It can be securely fixed via the electrode fixing member 240.
As shown in FIG. 4, the support tab 220 is provided with a protrusion 234 to make it easier to sink into the grid electrode fixing material 240 previously disposed on the anode substrate. I can do it.

As shown in FIG. 3, the support tab 220 is provided with a protrusion 234, and an intermediate connection portion 233 is provided between the tip connection portion of the support tab and the grid mesh to prevent the support tab 220 from being deformed.
In the present embodiment, the supporting tab 220 is provided with a connecting portion 234 at the tip portion with three claws 231 as leg portions. Further, an intermediate connecting portion 234 is provided between the tip connecting portion 231 and the mesh-like electrode portion 210 to prevent deformation of the supporting tab 220 as the leg portion 230 and increase the strength.
Although the shape of the instruction tab shown in FIG. 4 is a part of the example, the support tab 220 including the intermediate connecting portion 233 has various shapes, but the outer side of the mesh-like grid electrode 210 constituting the grid 200 is molded. The portion 237 is molded in the direction of the insulating substrate to form a leg portion, and has at least two claws 235 provided on the outside of the leg portion, and a coupling portion 234 at the distal end for coupling the claws 235 to each other. The connecting portion 234 is covered with the fixing material 240 and securely fixed.

The support tab 220 is bent at 90 to 100 degrees with respect to the mesh-like grid surface 210, so that the display area of the fluorescent display tube is larger than that of the conventional fluorescent display tube and the display area is enlarged. Can provide.
That is, as shown in FIG. 1, the cross-sectional shape of the grid 200 and the insulating substrate 100 is a trapezoidal shape having the mesh-like grid surface 210 as an upper side and the insulating substrate 110 as a bottom side, and the mesh-like electrode 210. And the angle formed by the leg 230 is 90 degrees to 100 degrees.
As shown in FIG. 1, when the indication tab 220 is provided in the area of the mesh electrode portion of the grid 200, the right outer indication tab of FIG. The trapezoidal shape has 210 as the upper side and the insulating substrate 110 as the bottom side, and the angle formed by the mesh electrode 210 and the leg 230 is 90 to 100 degrees.
According to the configuration of the present invention, the support tab 220 can be 90 ° to 100 ° with respect to the mesh-like grid surface, thereby increasing the area of the anode electrode.
Specifically, the display area of the fluorescent display tube using the support tab according to the present invention is increased by securing a distance of 0.5 mm to 1.0 mm between the mesh electrode and the anode. It was possible to mold at 90 degrees to 100 degrees when it was between degrees and 130 degrees.
Furthermore, the area of the grid electrode fixing material can be reduced by omitting the claw portion.
From the above, it is possible to provide a fluorescent display tube in which the display area is enlarged by 0.7 mm in the lead direction and the outer side of the insulating substrate on the opposite side of the lead with respect to the molding direction of the support tab. (Fig. 1, Fig. 7)
When a plurality of grids are arranged opposite to each other, a distance of 3 mm is conventionally required, but the distance can be reduced to 2.1 mm, thereby providing a fluorescent display tube with a further expanded display area. .
The distance between adjacent grids of 2.1 mm is the same as the distance between adjacent grids of a normal dynamic drive fluorescent display tube that does not use a supporting tab in the middle.

(Example 2) An example of a fluorescent display tube in which light emission is observed from the side of an insulating substrate on which phosphors that emit light by excitation of a slow electron beam from a filament are laminated.
In the fluorescent display tube of the present invention, as shown in FIG. 2, a wiring 120 made of an aluminum thin film is patterned on the upper surface of an insulating substrate made of a glass plate, which is the insulating substrate 110, and simultaneously the width of the aluminum thin film is made by photolithography. An anode 150 is formed with an aluminum hatching pattern of 10 to 50 μm. An insulating coating 130 having an anode 150 as an opening is laminated on a desired portion of the wiring by a screen printing method. The anode 160 is completed by laminating the phosphor 160 that emits light upon receiving a low-speed electron beam from the filament 310 on the upper surface of the anode by screen printing. A grid 200 according to the present invention is disposed above the phosphor 160, and a filament 310 serving as an electron source is disposed above the grid 200.
A fluorescent display tube was produced in the same manner as in Example 1 except for the anode substrate.

Light emission patterns arranged at a high display density can be driven independently of each other, and a high display density can be achieved with a small arrangement interval of grids provided corresponding to the anode to control the driving of the anode. A fluorescent display tube could be provided.
As a result, high display performance for display elements, which is a demand from the market, has become possible.

Fluorescent display tube of the present invention Fluorescent display tube of the present invention The figure which shows the adhering part of the grid support tab of this invention, a grid electrode fixing material, and a glass substrate The figure which shows an example of the tab for grid support of this invention The figure which shows an example of the tab for the conventional grid support Diagram showing an example of a conventional grid Diagram showing an example of a conventional grid Diagram showing a conventional fluorescent display tube

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 ... Airtight container 110 ... Insulating substrate 111 ... Insulating substrate surface 120 ... Wiring 130 ... Insulating film 140 ... Through hole 150 ... Anode 160 ... Phosphor 200 ... Grid 210 ... Mesh electrode part 220 ... Support tab 230 ... Leg part of support tab 231 ... Tip part connecting part of support tab 232 ... Tip of support tab Sectional section 233 ... Intermediate connecting portion of the supporting tab 234 ... Protrusion of the connecting portion of the leading end portion of the supporting tab 235 ... Nail of the supporting tab 236 ... Molding portion 237 ... of the supporting tab Claw 238: substrate contact surface of support tab claw 240 ... grid electrode fixing material 310 ... filament 410 ... lead 510 ... box-type container 520 ... frit glass

Claims (4)

An envelope that is maintained in a high vacuum state inside, an anode in which a phosphor is laminated on an insulating substrate that constitutes a part of the envelope, and a mesh electrode part that protrudes outside is integrally formed. A fluorescent display tube having a grid fixed to the insulating substrate using the support tab as a leg portion.
The supporting tab has two or more claws protruding outside the mesh electrode portion with the mesh electrode portion as a base end, and a connecting portion for connecting the two or more claws,
The grid is arranged such that the mesh electrode portion is a long side, a part of the supporting tab is a short side, the short side is a leg, and a tip of the leg is in contact with the insulating substrate. And a connecting portion of the supporting tab is covered with a grid electrode fixing material disposed on the insulating substrate to fix the grid to the insulating substrate. An envelope that is maintained in a high vacuum state inside, an anode in which a phosphor is laminated on an insulating substrate that constitutes a part of the envelope, and a mesh electrode part that protrudes outside is integrally formed. In a fluorescent display tube having a supporting tab and a supporting tab integrally formed in the mesh electrode portion region, and having a grid fixed to the insulating substrate using the supporting tab as a leg portion,
The supporting tab has two or more claws protruding outside the mesh electrode portion with the mesh electrode portion as a base end, and a connecting portion for connecting the two or more claws,
The grid is arranged such that the mesh electrode portion is a long side, a part of the supporting tab is a short side, the short side is a leg, and a tip of the leg is in contact with the insulating substrate. And a connecting portion of the supporting tab is covered with a grid electrode fixing material disposed on the insulating substrate to fix the grid to the insulating substrate.   The cross-sectional shape of the grid and the insulating substrate is a trapezoidal shape with the mesh-shaped grid surface as the upper side and the insulating substrate as the bottom, and the angle between the mesh-shaped electrode and the leg is 90 to 100 degrees. The fluorescent display tube according to claim 1, wherein the fluorescent display tube is provided.   4. The fluorescent display tube according to claim 1, further comprising a protrusion on an outer side of the connecting portion of the supporting tab.

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