JPS6235441A - Fluorescent character display tube - Google Patents

Abstract

PURPOSE:To obtain a glass spacer for a fluorescent character display tube by folding a belt-like thin glass piece in such a manner that the heated area is located inside so as to prevent the curved part from becoming thin. CONSTITUTION:A part 100 of a thin glass piece 20 is heated with a gas torch 41 until the glass of the part 100 is soften and then the soften part 100 is pushed in a direction 56 to fold the glass piece 20. At the time point when the glass of the part 100 becomes soft, the gas torch 41 is moved away so that it does not interrupt the folding. Heating the inner surface of the part 100 results in production of a glass mass 102 in the curved part 100 and therefore the curved part 100 does not become thin and becomes rather thick. The mass 102 is located not only on the inner surface of the curved part 100 but also protrudes over and under the corner as projections 103 and 104. The upper and the lower surfaces of the curved part 100 are pressed while it is soft by a jig 47 in directions 57 perpendicular to the folded glass piece 20 until the surface 105 of the glass piece 20 and the pressed surface 106 of the corner becomes located on the same plain.

Description

[Detailed description of the invention] (1) Description of the field to which the invention pertains The present invention relates to a fluorescent display tube.

(2) Description of the prior art It is known to bend a long thin strip of glass or a glass rod into a frame shape and use it as a glass spacer between the 7Ace of a display tube and the substrate.For example, Utility Model Application No. 53-4856
2. Utility Model 1986-130263 and Utility Model 1987-130
It is 984.

The conventional method of making a glass spacer will be explained using an example of making it from glass pieces. As shown in FIG. 1, there are scratches 60, 61, 62 cut on the plate glass 30 with a glass cutting bit made of super steel.
and mechanically cut it into glass strips 20. Next, as shown in FIG. 2, all the jigs 40 are used, the glass strips 20 are placed in the jig, and the glass strips are locally heated and softened with a gas torch 41, and the glass strips are bent along the jig (as shown by dotted lines). , the jig is sequentially rotated nine times as indicated by the arrow 42 to form a rectangular glass spacer frame 50 as shown in FIG. 3(5). Furthermore, the most common method for applying solder glass to the glass spacer frame 50 is a printing method using a screen, as shown in the fourth factor. In other words, the screen 4 has a penetration portion 400 made of stainless mesh that substantially matches the shape of the glass spacer frame 50 on which the coating is to be applied.
31F! : The frame-shaped penetrating portion 400 of this screen 43 and the printed portion 5 of the Tokara spacer frame 50 are used.
1 and spread the solder glass paste 31 (hereinafter abbreviated as glass paste) of the desired viscosity evenly on the top surface of the screen, and then use a squeegee 44 to spread the frame-shaped penetrating portion 40.
The glass paste 31 is applied to the glass spacer frame 50 by scraping out the glass paste 31 from the glass spacer frame 50, and then it is formed on the entire welded part of the fired Lenlder glass 6, and the exhaust pipe 8 is also welded to a part of the corner with the same solder glass. 5
The glass spacer with exhaust pipe shown in the figure is completed. This glass spacer is sandwiched between the face 7 and the substrate 10 together with the power supply leads 71, 72, 73 from the internal electrodes as shown in Fig. 6, welded with solder glass 6, and then evacuated (the exhaust pipe 8 is gii-1, the display tube is completed. Note that 2 indicates a display segment, 3 indicates a grid, 4 indicates a filament, and 5 indicates an insulation NZ.

Products using the conventional glass spacers described above have the following problems.

(Part 1) When a glass strip is bent to the side opposite to the side where the gas torch is placed as in the past, the thickness of the bent portion of the glass strip becomes thinner. Figure 3 @ is an enlarged view of this folded portion. As can be seen from the figure, the inner thickness of the bent portion, that is, a part of the corner, is thinner, and when the face and the substrate are welded, the leak path becomes shorter, which is unsatisfactory for use in fluorescent display tubes, which require high vacuum.

(Part 2) It was difficult to increase the amount of solder glass applied to the welded portion of the glass spacer.

For some reason, I used the conventional method to remove glass:! l? l-
To increase this, it is common to increase the resin thickness of the screen, but increasing the resin thickness increases the resistance of the side wall where the glass paste penetrates, making it difficult for the glass paste to be scraped out with a squeegee. It is. As a result, the amount of glass in the hermetically sealed part of the product was insufficient, and if holes were formed in the sealed part, subsequent defects were likely to occur. %[i@6 In the diagram of the product shown in factor 71, 72, 73, the thickness of the power supply lead is designed to be thicker than general products depending on the product's use, and there are some dyed products, but the thickness of the lead in between. The thicker the spacer, the larger the gap between the glass spacer 50 and the substrate 1, which means that not only the substrate IFi but also the solder glass 6 iL of the glass spacer 50 must be made larger. There is no problem if the through-hole of the Mayu screen and the glass spacer frame are perfectly aligned, but if the glass spacer is even slightly deformed and there is a local misalignment with the through-hole, it may be difficult to use the squeegee. When the glass paste is scraped out from the metal fitting hole, the glass paste oozes out from above the glass spacer, resulting in an uneven coating film where the thickness of the glass paste becomes thinner locally! The result was i-.

(Part 3) As the product becomes larger, the face and substrate need to be thicker depending on the size. The reason is that the inside of a fluorescent display tube is maintained in a high vacuum, so external pressure is always applied to the face and substrate, which are part of the envelope, and as the product becomes larger, it becomes harder to withstand this external pressure. Having to use a thicker face and substrate means that the product is larger, which means that the product is heavier.

(3) Object of the invention An object of the invention is to provide a fluorescent display tube that solves the above-mentioned problems. That is, the fluorescent display tube of the present invention is made by locally heating and bending a scribe-cut glass piece with a heat source such as a gas torch, rather than making the glass piece conform to the outer shape of the 7-ace glass, and by bending the glass piece by locally heating it with a heat source such as a gas torch.
This is done from the F3 side, pressing the folded part from the top and bottom directions that are almost perpendicular to the folding plane, and pushing one end of the bent glass strip from the outer periphery of the glass spacer frame to PUII. The feature is that a glass spacer is used in which solder glass is formed on the welded part of the glass spacer to the substrate.

(4) Explanation of the structure and operation of the invention The following is a detailed explanation of the structure and operation of the invention. Figure 7 shows glass strip 2
The entire bent part 100 of 0 is heated with a gas torch 41, and when the glass is softened, the glass pieces are indicated by thick arrows 56
Push it in the direction of and bend it as shown in Figure 8. gas torch 4
1 moves to a position where it does not interfere with bending once the glass has softened.

One of the features of the present invention is that by heating the gas torch from the inside of the fold, the thickness of the fold does not become thinner, and as shown in the enlarged view of FIG. Rather, it is locally thick υ
The conventional drawback that some corners become thin has been resolved. The reason why this self-destruction occurs on the inside of the bend is that the temperature of the outside glass, which is not directly heated by the gas torch, is lower than the inside and is less likely to cause viscous flow, so it is bent based on the outside, so the difference in dimensions between the outside and the inside is only for the inside glass. There will be 9 more pieces of meat left over. This self-deprecation V appears not only on the inside but also on the upper and lower parts of the bent corners as protrusions 103 and 104, respectively. Another feature of the present invention is that this protrusion t-9th
As shown in the figure, from the direction perpendicular to the bending plane as shown by arrow 57, when the glass is soft, use the jig 47 to press all the upper and lower parts of the bent part and press it against one plane 105 of the glass strip as shown in the figure. This allows the rear corner portions 106 to be flush. Next, the entire manufacturing procedure for this glass spacer is
This will be explained using FIGS. 0 to 13.

First, in the first step (a) in Figure 10, the glass strip 2 is
002 locations, 200 and 201al indicated by arrows - heat with a gas torch at the same time. At this time, heat the glass with a gas torch and do the following steps from 111i onwards, heat it in two places, bend it in two places in the first position, and after bending, the protrusion on the part of the corner that was bent while the glass was still soft is shown in Figure 9. Lean on it and press from above and below to make it flat. Next, in the second step, in Figure 10 (b), the glass spacer frame (
C) obtain ffi. The gap between the edge and end of the glass strip shown at 300 in Figure 1O (q) is for welding the entire exhaust pipe. As a modification of Figure 10, Figure 11 shows the gap between the edge and end of the glass strip. Remove the glass strips 2 so that there are no gaps.
Length 0 and bending position 2000 # Fully adjusted, the ends of the glass strips are joined, heated with a gas torch, pressed from the top and bottom to adjust the shape, and the 1111th
It is completely welded like 201. In this type, it is necessary to suppress not only the vertical direction but also from the outside, which may be effective depending on the thickness of the glass strip used and the size of the glass spacer frame. This glass spacer frame is used for products where the exhaust pipe does not attach to the glass spacer. FIG. 12 shows an embodiment in which one end of the glass strip, which is one of the features of the present invention, is partially left in the entire glass spacer frame. 203 and 204 shown in FIG. 12(5) of the glass strip 20
The position of 'I! ``Heat with a gas torch in exactly the same way as the example in Figure 10, suppress the upper and lower protrusions, and obtain the image shown in Figure 12 (0).

Next, the two positions 205 and 206 in Figure A) are simultaneously bent and pressed in the same way to obtain Figure 0, and finally 207 is heated to form a filled glass spacer frame as shown in Figure υ).

A feature of this glass spacer frame is that one end of the glass strip □ is partially left inside the glass spacer frame as shown at 302 in FIG. 12 ([)). This reason is particularly effective in the case of large-sized products. The reason for λ is that the inside of the fluorescent display tube is maintained at a high vacuum, so external pressure is always applied to the 7 ace and the substrate, as mentioned above.

In particular, as the size of the product increases, the external pressure exerted on the surface of the product also increases, so it is necessary to increase the thickness of the substrate and face to withstand this pressure, resulting in the problem that the product becomes heavier.

Figure 120 and Figure 13l-, which will be discussed later, are intended to solve this problem. That is, in the case of a product that is subjected to external pressure, by leaving one end 302 of the glass strip at the center of the plate, it can be used as a support to prevent the face and the substrate from being pushed toward the vacuum side by the external pressure. This support structure allows the face and board to be thinner than products with conventional structures.
Great weight reduction effect. While the example shown in FIG. 12 leaves one end 302 of the glass strip on the long side of the rectangular glass spacer frame, as another example, FIG. It was left on the side. The work steps are the same as in the previous example, so I will briefly explain them. First, the glass strips 20, 208 and 209 in Figure 13 (5), are simultaneously heated and folded as shown in Figure 13 (B), and then 210 and 2 in Figure 13 (B) are bent.
11 is heated at the same time, and finally bent at right angles to the 212t-heating side of the same figure (q) to complete the glass spacer frame CD1f: L of the same figure.

The gap shown at 300 in FIGS. 12 and 13 is for exhaust pipe welding. The glass spacer frame made in this manner needs to be coated with a layer of adhesive glass at the welded part with the substrate. In this embodiment, a flat plate 45 as shown in FIG.
A recess 401' is provided on the top, and a stainless steel mesh 4 is provided on the bottom.
Place 6. First, add the glass paste 31.
4, and by applying pressure on the flat plate with the squeegee 44 and reciprocating in the direction of the arrow 55, the glass paste 31 with the flat plate is evenly filled into the recess 401 with the flat plate. Reference numeral 48 denotes a enclosure to prevent the glass paste 31 from protruding outside the flat plate. The glass spacer 50 is the first
As shown in Fig. 5, the glass spacer frame 50 is held by a chuck 49 and completely immersed in the stainless steel mesh 46 placed at the bottom! By doing so, the solder glass 31 is applied to a predetermined portion of the glass spacer frame 50. Usually, a plurality of glass spacer frames 31 are held in order to increase work efficiency, but in the case of a plurality of VC glass spacer frames, it is especially important that the welding surfaces of the VC glass spacer frames be positioned on the same horizontal plane. The reason for placing the stainless steel mesh at the bottom of the recess is to prevent air bubbles from being trapped in the glass paste application area of the glass spacer frame.When the glass spacer frame is immersed in the paste, this mesh and the VC glass spacer frame are welded together. By bringing the surfaces into contact, bubbles are removed and a surface coated with glass paste of uniform thickness can be obtained.

According to this embodiment, the thickness of the glass paste can be easily controlled by deeply immersing the entire glass spacer frame into the glass paste. That is, if you want to immerse yourself in the water, you can make a deep recess 401 with respect to the flat plate shown in FIG. On the other hand, some products have a thin layer of glass paste applied to them, making them more durable.

For example, in the fluorescent display tube shown in Figure 6, the metal layer power supply lead is distributed from the inside of the tube to the outside of the tube, but depending on the product, some products are made with Ag printing, and in these types, the thickness of the lead can be ignored. It is better if the solder glass is thinner. For the purpose of making it more rigid, it may be necessary to make no recess at all (force to make the recess 401Th shallow with the flat plate in FIG. 14).

In the case of conventional screen printing, the higher the viscosity of the glass paste, the harder the glass paste will come off, and as mentioned earlier, even if you increase the total thickness of the screen and apply a thicker amount, the screen will not come through easily. Although there was a drawback that work efficiency was lowered, this embodiment was able to solve this difficult problem.

Figures 16 and 17 show a glass spacer frame that has been rolled and coated. After this, the exhaust pipe 8 is fired and further welded to the entire solder glass to complete a glass spacer as shown in FIGS. 18 and 19.

These glass spacers are the same as conventional ones.
One end of the glass strip, which is one of the features of the present invention, which becomes the fluorescent display tube shown in FIGS. 0 and 21? In the product of FIG. 21 left in the spacer frame 1011, one end 302 of the glass strip is applied to a product designed so that it does not obstruct display segment 2, as shown above. In particular, the features of the present invention can be effectively utilized in large fluorescent display tubes, where there is an increasing demand for composite display of numbers, characters, symbols, etc. by changing their size and color. That is, in the embodiment shown in FIG. 21, a display segment 2 showing a large number is arranged in the center,
This is a product designed by a friend with a small symbol 9 placed in the lower right corner, and one end 302 of the glass strip of the glass spacer has numbers and symbols placed in a strange way so as not to obstruct the display. This effectively brings out the advantages of the support column provided by the one end 302.

As described above, according to the present invention, thinning of the bent portion can be prevented by a simple method of bending a band-shaped glass strip so that the heating side is completely inside, and it can be used as a glass spacer for a firefly-xi display tube. was completed. This was achieved because we were aware of the problem of thinning of the folded portion in the conventional method mentioned above, and it has an effect that could not be expected from the conventional technique. In addition, by leaving a portion of one end of the glass strip inside the glass spacer frame, the product can be made lighter, and the solder glass paste applied to the glass spacer frame can be applied to the glass spacer frame and the screen through-hole, according to eight cases of misrepresentation. There is no need to worry about problems caused by misalignment, and the thickness of the solder glass paste can be easily controlled, making it possible to obtain a fluorescent display tube with improved reliability in terms of airtightness as a product.

[Brief explanation of drawings]

1 to 6 are diagrams illustrating a conventional fluorescent display tube. Figure 1 shows the reasons for cutting the glass plate, Figure 2 shows how the glass strip cut in Figure 1 is completely folded, Figure 3 shows the glass spacer frame with all the photons folded, Figure 4 shows the application of glass paste using a screen, Figure 5 shows the finished glass spacer, Figure 6
The figure shows a complete conventional fluorescent display tube. 7 to 21 are fluorescent display tubes according to the present invention? FIG. Figures 71 to 13 show the folding of glass strips;
Figure 14 - if 51 yen J is glass paste application, Figure 16 - 17 is glass spacer frame, 18th - 19th
The figure shows a completed glass spacer, and FIGS. 20 and 21 show completed views of a fluorescent display tube according to the present invention. DESCRIPTION OF SYMBOLS 1... Substrate, 2... Display segment, 3... Grid, 4... Filament, 5... Insulating layer, 6...
・Nolder glass, 7... Face, 8... Exhaust pipe, 9... (Display) symbol, 20... Glass piece, 3
0... Plate glass, 31... Glass paste, 40...
... Jig, 41... Gas torch, 42... Rotation direction of jig, 43... Screen, 44... Squeegee,
45...Flat plate, 46...Stainless steel mesh, 47
...Press jig, 48...Enclosure with flat plate, 49...
Chuck, 50... Glass spacer frame, 51... Portion to be printed, 55... Direction of movement of squeegee, 5G... Direction for pushing glass pieces, 57... Pressing direction, 60, 61,62... Cutting scratches, 71.72. 73...Feeding [IJ-do, 100...Bending portion, 1
01...Bending portion, 102...Flesh in the bending portion, 103.104...Protrusions above and below the bending portion, 10
5... One plane of glass strip, 1o6... Part of bent corner, 200-212... Heating position, 3oo.
... Gap for exhaust pipe welding, 301 ... Part of corner completely welded, 3o2 ... One end of glass strip, 4
00... Penetrating part of the screen, 401... Concave,
ㅅ、・）＼ Agent, Patent Attorney Susumu Naiban (2,・15f 箭4子躬) fig.IO disease!7th ward, 20th fig. 21

Claims (1)

[Scope of Claims] A fluorescent display tube in which a glass spacer is arranged in a sandwich-like manner between an anode substrate on which display segments are formed and a face glass, and each is welded with solder glass, comprising: (1) the above-mentioned method; The glass spacer scribes and cuts a glass plate to create glass strips, and then locally heats these glass strips with a heating source and bends them into a frame-like shape. At this time, the heating direction of the heating source that locally heats the glass strips. The first step is to press the bent part from the top and bottom directions perpendicular to the folding plane to create a glass spacer frame, and then apply solder and glass to the welded part of the glass spacer frame to the substrate and bake it. A fluorescent display tube characterized by the use of a glass spacer. (2) A fluorescent display tube characterized in that a glass spacer is used in which when the glass strip is bent to form a glass spacer frame, one end of the glass strip to be bent is left partially inside the glass spacer frame.