JPH069046U - Fluorescent display tube - Google Patents

Abstract

(57) [Summary] [Purpose] To reliably eliminate the occurrence of vacuum airtight leaks during long-term use and improve reliability. [Arrangement] Anode substrate assembly 8 and cover glass assembly 24
Are airtightly sealed by the low-melting glass 25, and the external lead-out metal lead plate 11c, which is led out to the outside through the airtight seal, has rolls and creases 1 of the metal lead plate material.
It is arranged so that the direction of 1 ₂ is parallel to the length direction of the airtight attachment part.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a fluorescent display tube used for displaying numbers, characters, graphs and the like on calculators, audio equipment, home appliances, measuring instruments and the like.

[0002]

[Prior art]

 FIG. 3 is an exploded perspective view illustrating a configuration of a fluorescent display tube that has been proposed in recent years, and FIG. 4 is an exploded perspective view of a metal frame body. In these drawings, the anode substrate 1 is an insulating layer 3 formed by thick-film printing an insulating paste on a soda glass plate 2, and conductive connection wiring and terminals formed by thick-film printing Ag paste. It is composed of a portion 4 and a light emitting anode 5 formed by thick film printing of a phosphor paste.

After the grid frame body, which integrally connects a plurality of mesh portions 6 press-molded so as to be separated from the light emitting anode 5 by a predetermined distance, is positioned and mounted on the anode substrate 1. The conductive or non-conductive paste 7 is applied, baked and fixed, and then the connection portion of the grid frame body is cut and removed to obtain the anode substrate assembly 8.

In addition, above the anode substrate assembly 8, filament support frames 11a and 11b made of a 426 alloy plate material for leading out the cathode lead to the outside, a metal round bar 12 and a nesa contact portion 13 are integrally formed, A filament anchor 15a having a flange portion for giving tension to the filament 14 and a filament holder 15b to which the other end of the filament 14 is welded and fixed are welded and fixed by using a jig and an automatic welder (not shown), respectively. Are formed.

Further, in this metal frame body, a filament frame 14 and a getter 16 are welded and fixed on a filament anchor 15a and a filament holder 15b by a jig and an automatic welder to form a metal frame body assembly 17. .

Above the metal frame assembly 17, a transparent glass plate 21 made of soda glass, a spacer glass 22, and an exhaust pipe 23 are coated with a low melting point glass on the sealing portion of the spacer glass 22. A cover glass assembly 24 is formed.

In each of the assemblies configured as described above, first, the metal frame assembly 17 is sandwiched between the anode substrate assembly 8 and the cover glass assembly solid 24, and sandwiched by a clip (not shown). After melting and fixing the low melting point glass 25 applied to the cover glass assembly 24 using a sealing furnace, the filament support frames 11a and 11b for leading out the cathode lead to the outside are cut at predetermined locations outside the tube to form a metal frame. The metal round bar 12 is separated from the body and the fluorescent display tube is assembled as shown in FIG.

Next, the inside of the tube is evacuated through the exhaust tube 23, a clip pin (not shown) is attached to the terminal portion 4, and after a predetermined process such as aging and inspection, a fluorescent display tube is completed.

With such a configuration, the amount of the 426 alloy plate material forming the filament support frames 11a and 11b can be significantly reduced, the assembly process can be easily mechanized, and the external terminal extraction position can be arbitrarily selected. You can get the effect that you can.

[0010]

[Problems to be solved by the device]

However, the thus constructed fluorescent display tube is constructed by melting and fixing and sealing the anode substrate assembly 8 and the cover glass assembly 24 with the low melting point glass 25. Further, the filament support frames 11a and 11b which protect the airtightness from the inside of the fluorescent display tube and are led out from the airtightly sealed portion to the outside of the tube are used for manufacturing the 426 alloy plate material as shown in FIG. The parts are aligned in a direction in which the direction of the finely corrugated rolls and streaks 11 ₁ mechanically generated along the length direction thereof coincides with the sealing path direction (direction in which the airtight sealing space leaks vacuum) indicated by the arrow direction A. Since the filament support frames 11a and 11b and the low-melting glass 25 are not well wetted to each other, it is highly possible that a vacuum-tight leak will occur through the uneven rolls and the grooves of the grooves 11 _1. There was a problem of being expensive. In particular, the occurrence of this type of vacuum airtight leak is extremely high with long-term use of the fluorescent display tube, and the reliability is significantly lowered.

Therefore, the present invention has been made in order to solve the above-mentioned conventional problems, and an object thereof is to completely eliminate the occurrence of vacuum airtight leak and improve reliability. To provide.

[0012]

[Means for Solving the Problems]

 In order to solve such a problem, the present invention is arranged so that the directions of rolls and creases formed on the metal lead plate for external extraction intersect with the sealing path direction.

[0013]

[Action]

 The metal lead plate according to the present invention is arranged such that the roll eyes and the streaks of the metal lead plate material are arranged in the direction intersecting the sealing pass direction, so that the bank of the roll eyes and the streaks suppresses the generation of the leak path.

[0014]

【Example】

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is an exploded perspective view for explaining the construction of an embodiment of a fluorescent display tube according to the present invention, and the same parts as those in the above-mentioned figures are designated by the same reference numerals. In the figure, 1 and different respect, the filament support frame 11c, 11d uneven roll eyes caused the 426 alloy sheet material and streaks 11 ₂ derived outside the tube protects the airtight from the inside of the fluorescent display tube Is formed by taking parts toward the direction intersecting the length direction of the filament support frames 11c and 11d. The direction of these irregularities rolls eyes and streaks 11 _2, a filament support frames 11c in the drawings, but is displayed only on the surface side of the 11d, actually intersect Similarly to the rear surface side direction The uneven roll eyes and streaks 11 ₂ are formed.

The filament support frames 11c and 11d formed in this way are separated from each other by the low melting point glass 25 between the anode substrate assembly 8 and the cover glass assembly 24 as shown in the enlarged cross section of the main part in FIG. 2 (a). As a result of the sealing, the sealing path direction (arrow direction A) and the direction of the concavo-convex rolls and the creases 11 ₂ are arranged substantially at right angles as shown in the enlarged plan view of the main part in FIG. 2B. since the close contact with the low-melting glass 25 _1, 25 ₂ in the uneven roll eyes and streaks 11 ₂ parts of the front and back side, the bank of this contact has been uneven roll eyes and streaks 11 ₂ parts, the occurrence of a leak path Will be suppressed.

In addition, in the above-described embodiment, the case where the metal lead plate for external lead-out is applied to the filament support frames 11c and 11d has been described, but the present invention is not limited to this, and fluorescent display is possible. It is needless to say that when a metal lead plate is used as an electrode to be led out of the tube, for example, for an anode or a control electrode, the same effect as described above can be obtained even if applied to these metal lead plates. .

[0017]

[Effect of device]

 As described above, according to the present invention, by arranging the roll eyes and the streaks formed on the external lead-out metal lead plate so as to intersect the sealing path direction, the roll eyes and the streak banks are formed. Since the leak path is suppressed by this, the generation of the vacuum-tight leak is completely eliminated, and the extremely excellent effect of obtaining a highly reliable fluorescent display tube is obtained.

[Brief description of drawings]

FIG. 1 is an exploded perspective view illustrating the configuration of an embodiment of a fluorescent display tube according to the present invention.

FIG. 2 (a) is an enlarged plan view of an essential part showing a structure of a fluorescent display tube according to the present invention, and FIG. 2 (b) is a plan view of FIG.

FIG. 3 is a developed perspective view illustrating a configuration of a fluorescent display tube that has been proposed in recent years.

FIG. 4 is an exploded perspective view of the metal frame body shown in FIG.

FIG. 5 is an enlarged plan view of an essential part showing the configuration of a fluorescent display tube proposed in recent years.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Anode substrate 2 Soda glass plate 3 Insulating layer 4 Terminal part 5 Light emitting anode 6 Mesh part 7 Non-conductive paste 8 Anode substrate assembly 11c Filament support frame 11d Filament support frame 11 ₂ Concavo-convex roll eyes and streaks 12 Metal round bar 13 Nesa Contact part 14 Filament 15a Filament anchor 15b Filament anchor 16 Getter 17 Metal frame assembly 21 Transparent glass plate 22 Spacer glass 23 Exhaust pipe 24 Cover glass assembly 25 Low melting glass 25 ₁ Low melting glass 25 ₂ Low melting glass

Claims (1)

[Scope of utility model registration request] 1. An anode substrate on which an anode electrode having a wiring layer and a phosphor light-emitting layer is formed, a mesh-shaped control electrode which is conductively fixed on the anode substrate, and a plurality of electrodes arranged above the control electrode. A filamentary cathode, a cover glass that covers the control electrode and the cathode and is arranged to face the anode substrate, a frit glass that hermetically seals the anode substrate and the cover glass, and at least one of the electrodes is connected. And a metal lead plate for external lead-out, which is led out to the outside through the air-sealing attachment part, wherein the metal lead plate for external lead-out is air-tight A fluorescent display tube, which is arranged so as to be parallel to the longitudinal direction of the part.