JPH0817367A - Fluorescent character display tube - Google Patents

Abstract

PURPOSE:To achieve cost reduction without deteriorating quality and reliability by reducing the number of part items and a man-hour in welding process. CONSTITUTION:A filament support 11C, which is opposed to a filament support 11A having a filament anchor 15a applying tension to a filament 14, has in its center a gate-shaped filament-fixing portion 11C' formed integrally therewith which is curved into a rectangular shape so as to project toward a cover glass assembly 24 and which has apexes almost parallel to an anode base 1. The filament support 11C is formed by molding a part of a round bar of 426 alloy, and a flat portion 11c, having a structure similar to that of a flat portion 11a whose apex is formed at each end, is formed in the filament fixing portion 11C' by press molding method.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluorescent display tube applied to display numbers, characters, graphs and the like of calculators, audio equipment, home electric appliances, measuring instruments, etc., and particularly, a filament support for suspending and supporting a filamentary cathode. It is about structure.

[0002]

2. Description of the Related Art FIG. 3 is an exploded perspective view illustrating the structure of a conventional fluorescent display tube, and FIG. 4 is an exploded perspective view of a metal frame. In FIG. 3, the anode substrate 1 includes an insulating layer 3 formed by thick-film printing an insulating paste on a glass substrate 2 made of soda glass, and a thick-film printing Ag film or Ag paste.
The conductive connection wiring and the terminal portion 4 (not shown) formed of the above thin film, and the light emitting anode 5 formed by thick-film printing the phosphor paste.

A light emitting anode 5 is formed on the anode substrate 1.
After positioning and placing a grid frame body in which a plurality of mesh portions 6 press-molded so as to be separated from each other at a predetermined distance are integrally positioned, a conductive or non-conductive paste 7 is applied, and baked and fixed. The connection portion of the grid frame body is cut and removed to form the anode substrate assembly 8.

Above the anode substrate assembly 8,
Using a jig and an automatic welder (not shown), filament supports 11A and 11B made of 426 alloy round bars for leading out the cathode lead as shown in FIG. 4 and support holders 12a and 12b made of metal round bars similarly. Filament anchor 1 having a spring portion for applying tension to a filament 14 integrally formed with a nesa contact portion 13
5a and a filament holder 15b to which the other end of the filament 14 is welded and fixed are welded and fixed together to form a metal frame. Reference numeral 16 is a getter that is welded and fixed to the filament holder 15b in a later step.

The above-mentioned filament supports 11A and 11B for external lead out of the cathode lead correspond to the hermetically sealed attachment portion before the support holders 12a and 12b, the filament anchor 15a and the filament holder 15b are integrated. A flattened portion 11a is formed in which the portion to be flattened in advance by press working. The flat portions 11a are formed in the airtightly adhered portions of the filament supports 11A and 11B, respectively, so that the airtightly adhered portions, which will be described later, are good and the anode substrate 1 or the cover glass assembly 24 has cracks at its sandwiching portions. Can be prevented.

In addition, on the metal frame body, the filament 14 is placed on the filament anchor 15a and the filament holder 15b by a jig and an automatic welder (not shown).
The getter 16 and the getter 16 are welded and fixed to each other to form a metal frame 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 provided.
A cover glass assembly 24 is formed by temporarily applying a low-melting point sealing glass to each of the sealing portions and is assembled temporarily.

The respective assemblies thus constructed are
The metal frame assembly 17 was sandwiched between the anode substrate assembly 8 and the cover glass assembly 24, sandwiched by a clip (not shown), and applied to the cover glass assembly 24 using a sealing furnace (not shown). The low melting point sealing glass is melted and fixed. In this case, the cathode lead external lead-out filament supports 11A and 11B are melted and fixed at the flat portion 11a. After that, the filament supports 11A and 11B for leading out the cathode lead to the outside are cut at a predetermined position outside the tube to separate the support holders 12a and 12b from the metal frame body to assemble a fluorescent display tube into a completed product.

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

With this structure, the amount of 426 alloy used can be greatly reduced, the assembly process can be easily mechanized, and the external terminal take-out position can be arbitrarily selected.

The above-mentioned support holders 12a, 1
No particular reference is made to the material of 2b, but a soft iron wire is used. This material is a part that is attached to the outside of the fluorescent display tube and is a part that is cut off and removed when the fluorescent display tube is completed. Therefore, if it can be welded and fixed to the filament supports 11A and 11B for leading out the cathode lead, There are no restrictions on material properties.

[0012]

However, in the fluorescent display tube thus constructed, the anode substrate assembly 8 is used.
The metal frame assembly 17 disposed between the cover glass assembly 24 and the cover glass assembly 24 includes filament supports 11A and 11B for leading out the cathode lead and support holders 12a and 12b.
Since it was composed of the NESSA contact part 13, the filament 14, and the filament anchors 15a and 15b, and each of them was manufactured in combination, the number of components and the number of assembling steps are increased. However, there has been a problem that the component cost and the manufacturing cost are high and the product cost is high.

Therefore, the present invention has been made in order to solve the above-mentioned conventional problems, and an object thereof is to reduce the number of components and welding man-hours without lowering the quality and reliability and to lower the price. It is to provide a realizable fluorescent display tube.

[0014]

In order to achieve such an object, in the fluorescent display according to the present invention, a filamentary cathode is directly fixed to a part of a filament support arranged opposite to a filament support provided with a filament anchor. It has a structured structure.

[0015]

In the present invention, since the filamentary cathode is directly fixed to the filament support and is suspended and supported, the filament holder that supports and fixes the filamentary cathode is shared.

[0016]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 is an exploded perspective view for explaining the configuration of an embodiment of the fluorescent display tube according to the present invention, and FIG.
The same reference numerals are given to the same portions as. In these figures, a filament support 11A provided with a filament anchor 15a for applying a tension to the filament 14 and a filament support 11C disposed opposite to each other have a rectangular shape so as to project toward the cover glass assembly 24 in the central portion. Gate-shaped filament fixing portion 1 having a top portion that is bent in parallel and is substantially parallel to the anode substrate 1.
1C 'is integrally formed.

Also, this filament support 11C
Is formed by, for example, partially forming a round bar material of 426 alloy, and the top portion of the filament fixing portion 11C 'is formed on both end sides as shown in the enlarged sectional view of FIG. The flat portion 1 having the same structure as the flat portion 11a
1c is formed by a press molding method.

In such a structure, one end side of the plurality of filaments 14 is directly welded and fixed to the flat portion 11c formed on the gate-shaped top of the filament support 11C by, for example, an electric welding method, and tension is applied to the other end side. It is welded and fixed to the filament anchor 15a to be applied, and the filament 1 is interposed between the filament anchor 11a and the filament support 11A.
4 is suspended and supported.

With this structure, a plurality of filaments 14 can be directly attached and fixed to the filament support 11C, so that the filament holder 15b for supporting the filaments 14 (see FIGS. 3 and 4).
Since the reference holder is not required, the number of parts can be reduced and the process of welding the filament holder 15b is also unnecessary. Moreover, since the assembly structure is also simplified, the assembly is facilitated and the assembly jig is also simplified, so that the production cost is significantly reduced.

[0020]

As described above, according to the present invention,
One end of the filamentous cathode is fixed to the filament anchor provided on the first filament support, and the other end of the filamentous cathode is directly fixed to a part of the second filament support. Since the filament holder for supporting and fixing is not required, the number of components and welding man-hours is reduced, the assembly jig is simplified, the manufacturing cost is reduced, the quality and reliability are not deteriorated, and the price is low. An extremely excellent effect of providing a fluorescent display tube can be obtained.

[Brief description of drawings]

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

FIG. 2 is an enlarged cross-sectional view showing the structure of the filament support shown in FIG.

FIG. 3 is a developed perspective view illustrating a configuration of a conventional fluorescent display tube.

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

[Explanation of symbols]

1 ... Anode substrate, 2 ... Soda glass substrate, 3 ... Insulating layer, 4
... Terminal portion, 5 ... Light emitting anode, 6 ... Mesh portion, 7 ... Non-conductive paste, 8 ... Anode substrate assembly, 11A ... Filament support, 11B ... Filament support, 11C ...
Filament support, 11a ... Flat portion, 11b ... Flat portion, 12a ... Support holding body, 12b ... Support holding body, 13 ... Nesa contact portion, 14 ... Filament, 1
5a ... Filament anchor, 15b ... Filament holder, 16 ... Getter, 17 ... Metal frame assembly, 21 ...
Transparent glass plate, 22 ... spacer glass, 23 ... exhaust pipe,
24 ... Cover glass assembly.

Claims (2)

[Claims] 1. An anode substrate in which a wiring layer and a phosphor light emitting layer are formed on a surface of a glass substrate, a mesh grid arranged to face the phosphor light emitting layer of the anode substrate, and above the grid. A plurality of filamentary cathodes arranged along the arrangement direction of the phosphor light emitting layer, and a first filament support and a second filament support disposed on both ends of the anode substrate in the longitudinal direction and suspending and supporting the filamentous cathode. And a cover glass that covers the grid and the cathode and is hermetically sealed to the anode substrate, and a hermetically sealed space formed by the anode substrate and the cover glass is evacuated to fluoresce. In the display tube, one end of the filamentary cathode is fixed to a filament anchor provided with the first filament support, Fluorescent display tube and the other end of the filament cathode is fixed to a portion of the second filament supports. 2. The filament support according to claim 1, wherein a part of the filament support is formed in a gate shape having an apex parallel to the anode substrate surface, and the apex is formed in a flat shape. Characteristic fluorescent display tube.