JP2944331B2 - Fluorescent display tube - Google Patents

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, and more particularly to a fluorescent display tube of a type in which a divided grid support is fixed on a glass substrate with a conductive material paste.

[0002]

2. Description of the Related Art Conventionally, this kind of fluorescent display tube is shown in FIG.
As shown in (a) and (b), a grid power supply wiring layer (hereinafter, referred to as a power supply wiring layer) 2 is formed of Ag or Al on a glass substrate 1, and an insulating layer 3 containing a glass component is formed. A through hole for contact 4 and a graphite electrode layer (hereinafter, referred to as an electrode layer) 5 are sequentially formed by coating, and a grid support 6 is fixed to a conductive material on the insulating layer 3 including the through hole 4 on which the electrode layer 5 is formed. The grid was fixed with a paste 7 containing a binder (hereinafter referred to as a conductive material paste), and the grid was fixed after firing.

[0003]

In the conventional fluorescent display tube, the grid support is fixed with a conductive material paste on a vitrified insulating layer including a through hole on which an electrode layer is formed. Has a problem that the surface state tends to spread on the dense insulating layer after coating, and it is difficult to maintain a predetermined pattern shape, so that the grid cannot be arranged at a fine pitch.

An object of the present invention is to provide a fluorescent display tube in which grids can be arranged at a fine pitch.

[0005]

According to the present invention, there is provided a power supply wiring layer for a grid formed on a glass substrate and an insulating layer including a through-hole having a graphite electrode layer formed on the power supply wiring layer for the grid. In a fluorescent display tube in which grids are arranged by fixing divided grid support portions with a conductive material paste, the graphite electrode is provided on the insulating layer.
Providing a porous layer so as to surround at least a part of the layer,
The conductive material paste is applied to the inside surrounded by the porous layer , and the grid is fixed to the grid support, and the grid is arranged .

[0006]

Next, embodiments of the present invention will be described with reference to the drawings.

FIGS. 1 (a) and 1 (b) are a plan view and a sectional view of a main part of a first embodiment of the present invention.

In the first embodiment, as shown in FIGS. 1A and 1B, first, a power supply wiring layer 2 is formed on a glass substrate 1 by Ag.
Alternatively, it is formed of Al. Next, an insulating layer 3 containing a glass component is formed on the glass substrate 1 including the power supply wiring layer 2, and a through hole 4 for contact is formed on the power supply wiring layer 2. Next, a porous layer 8 of the same component and the same material as the electrode layer 5 is provided in the through hole 4 in a U-shape on both sides of the electrode layer 5 on the insulating layer 3 simultaneously with the electrode layer 5.

Further, the through hole 4 in which the electrode layer 5 is formed
The divided grid support portions 6 are fixed on the insulating layer 3 including the conductive material paste 7 with the conductive material paste 7. At this time, on the porous layer 8,
Although a part of the conductive material paste 7 is formed, the binder of the conductive material paste 7 causing the spread is absorbed by the voids of the porous layer, so that the binder does not spread over the porous layer 8.

FIGS. 3 (a) and 3 (b) are a plan view and a sectional view of a main part of a second embodiment of the present invention.

In the second embodiment, as shown in FIGS. 2A and 2B, the insulating layer 3 including the electrode layer 5 formed in the through hole 4 is formed on the insulating layer 3 as in the first embodiment. The divided grid support portions 6 are fixed with a conductive material paste 7. At this time,
The porous layer of the same component and the same substance as the electrode layer 5 is
By arranging the conductive material paste 7 around the conductive material paste 7, the spread of the conductive material paste 7 is prevented.

[0012]

As described above, the present invention provides a method of applying a conductive material paste by providing a porous layer on an insulating layer for fixing a grid support portion with a conductive material paste containing a conductive material and a binder component for fixing. Since the voids causing the subsequent spread are absorbed by the voids of the porous layer, the spread amount is reduced, and the shape of the predetermined conductive material paste can be easily maintained.

Therefore, it is possible to form a conductive paste having a fine pitch, and it is possible to arrange the grid at a fine pitch.

[Brief description of the drawings]

FIG. 1 is a plan view and a sectional view of a main part of a first embodiment of the present invention.

FIG. 2 is a plan view and a cross-sectional view of a main part of a second embodiment of the present invention.

FIG. 3 is a plan view and a sectional view of a main part of an example of a conventional fluorescent display tube.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Glass substrate 2 Power supply wiring layer 3 Insulating layer 4 Through hole 5 Electrode layer 6 Grid support part 7 Conductive material paste 8 Porous layer

Claims (4)

(57) [Claims] 1. A grid supporting portion divided on an insulating layer including a through hole having a grid power supply wiring layer formed on a glass substrate and a graphite electrode layer formed on the grid power supply wiring layer is electrically conductive. In a fluorescent display tube in which a grid is fixed with a material paste, at least a part of the graphite electrode layer is formed on the insulating layer.
A porous layer is provided so as to surround and is surrounded by the porous layer.
A fluorescent display tube , wherein the conductive material paste is applied to the inside, the grid support is fixed, and the grid is arranged. 2. The fluorescent display tube according to claim 1, wherein the porous layer is formed in a U-shape at both ends of the conductive material paste. 3. The fluorescent display tube according to claim 1, wherein said porous layer is formed so as to surround a conductive material paste. 4. The fluorescent display tube according to claim 1, wherein said porous layer is made of graphite.