JPH0145079Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention provides a fluorescent display tube in which a grid electrode is firmly fixed on an anode substrate via a glass spacer. It is related to.

[Prior art]

Conventionally, to fix grid electrodes in a fluorescent display tube, as shown in FIGS. 1a and 1b, glass spacers 2 and 3, on which adhesive frit glass 4 is applied in advance at predetermined locations on an anode substrate 1, are used as bases. A grid electrode 5 having an irregular mesh shape is installed on these glass spacers 2 and 3.
After temporarily fixing the fixing glass spacers ₆ and 7 with frit glasses 8 so as to sandwich both ends of the grid electrodes 5 1 to 5 _o , respectively, the frit glasses 4 and 8 are fired to attach each grid electrode 5 ₁ to 5 _o to the anode substrate 1. There is one that is fixed at a predetermined interval. In this case, the anode substrate 1 has a wiring layer formed with a predetermined wiring pattern by thick film printing or thin film on a transparent glass substrate, and a desired segment layer is formed on this wiring layer via an insulating layer. and a phosphor layer is formed.

Incidentally, in such an anode substrate, in order to improve the contrast of the light emitting surface, a colored insulating glass layer colored black is usually used as the insulating layer. However, conventionally, as shown in FIG. 2, the above-mentioned glass spacers 2 and 3 are fixed with frit glass 4 on a colored insulating glass layer 11 formed as an insulating layer on a transparent glass substrate 10. Therefore, there was a problem that the adhesive strength between the colored glass layer and the frit glass became weak. This is because (i) there is a difference in the coefficient of thermal expansion between the frit glass and the colored insulating glass layer (for example, if the frit glass is IWF-7583 (crystalline glass for assembly), 84
×10 ^-7 , 68 × 10 ^-7 for colored insulating glass (amorphous with alumina), and (ii) the surface of the colored insulating glass layer is porous, making it difficult to completely vitrify due to variations in firing temperature. Therefore, it has poor compatibility and wettability with the frit glass thereon, and (iii) the substantial adhesion area between the surface of the colored insulating glass layer and the frit glass becomes small. Therefore, there have been many problems in which the glass spacers come off due to the adhesive strength on the insulating layer of each glass spacer and the tensile force when fixing the grid. This became particularly noticeable as each grid electrode became longer.

[Summary of the idea]

The present invention was devised in view of the above circumstances, and in a fluorescent display tube in which a grid electrode is fixed on an anode substrate via a glass spacer, the insulating layer under the glass spacer is partially or completely removed. The glass spacer is fixed on the exposed glass substrate with frit glass, and the grid electrodes are fixed through the glass spacer, thereby firmly fixing each grid electrode and improving reliability. It provides: Embodiments of the present invention will be described in detail below with reference to the drawings.

〔Example〕

3 and 4 are a schematic plan view of an anode substrate showing an embodiment of the fluorescent display tube according to the present invention, and a partially enlarged sectional view corresponding to FIG. 2 when a glass spacer is fixed on the anode substrate. In these figures, the same or equivalent parts as in FIGS. 1 and 2 are designated by the same reference numerals. In the fluorescent display tube of this embodiment, a wiring layer is provided on a glass substrate 10, and a desired segment layer and phosphor layer are provided on the wiring layer via a colored insulating glass layer 11. As shown in FIG. 3, the colored insulating glass layer 11, which is the lower part of the glass spacers 2 and 3, is completely removed to provide openings 20 and 21.
Glass spacers 2 and 3 coated with frit glass 4 in advance are placed on the glass substrate 10 exposed through these openings 20 and 21. Then, a grid electrode 5 ₁ is placed on these glass spacers 2 and 3.
After temporarily fixing the fixing glass spacers 6 and 7 with frit glass 8 so as to sandwich both ends of the grid electrodes 5 1 to 5 _o , respectively, these frit glasses are fired to separate each grid electrode 5 ₁ to 5 _o from the anode substrate 1 at a predetermined distance. It was designed to be maintained and fixed. In addition, 22 and 23 in FIG. 3 are openings for fixing the filament support, and on the circumferential side of the anode substrate 1, a lead-out conductive layer 15, which becomes a part of the wiring layer, is provided as an electrode conduction terminal, respectively. It's being pulled out.

As described above, according to the above embodiment, the insulating glass layer 10 under the glass spacers 2 and 3 is completely removed to form the openings 20 and 21, and the fritted glass 4 is coated on the exposed glass substrate 10. By directly fixing the glass spacers 2 and 3, which have a dense surface condition on the transparent glass substrate 10, the adhesion area with the frit glass 4 becomes large, and its strength also increases. In addition, since soda glass has a thermal expansion coefficient of 85×10 ^-7 , frit glass 4 (IWF-7583) has a thermal expansion coefficient of 84×10 ^-7.
are almost equal to each other, and the influence of the difference in thermal expansion coefficients disappears. Therefore, the adhesive strength of the glass spacers 2 and 3 on the anode substrate 1 is increased, and each grid electrode can be firmly fixed, and there is no possibility of the grid electrodes coming off, improving reliability.

In addition, although the above-mentioned example shows the case where the insulating layer below the glass spacer is completely removed, the present invention is not limited to this, and the insulating layer below the glass spacer may be partially removed. You can also do this.

[Effect of idea]

As explained above, the problem with the fluorescent display tube of the present invention is that when fixing the grid electrode on the anode substrate via the glass spacer, the insulating layer under the glass spacer is partially or completely removed. ,
Since the glass spacer is fixed on the exposed glass substrate with fritted glass, the adhesive strength of the glass spacer is increased and each grid electrode can be firmly fixed, and the installation position of the glass spacer can be clearly determined. It has excellent effects such as making the assembly work easier.

[Brief explanation of the drawing]

Figures 1a and 1b are a schematic plan view and a side view of a grid electrode fixing structure showing an example of the conventional structure;
FIG. 2 is a partially enlarged sectional view of the glass spacer fixed on the anode substrate of FIG. 1, and FIGS. 3 and 4 are schematic diagrams of the anode substrate showing an embodiment of the fluorescent display tube according to the present invention. FIG. 2 is a plan view and a partially enlarged sectional view corresponding to FIG. 2 when a glass spacer is fixed on the anode substrate. 1... Anode substrate, 2, 3... Glass spacer for base, 4, 8... Fritted glass, 5 ₁ to 5 _o ...
Grid electrode, 6, 7...Fixing glass spacer, 10...Glass substrate, 11...Insulating layer, 2
0,21...opening part.

Claims (1)

[Scope of utility model registration request] The phosphor is equipped with an anode substrate in which a wiring layer is provided on a glass substrate, and a desired segment layer and phosphor layer are provided thereon via an insulating layer, and a grid electrode is fixed on this anode substrate via a glass spacer. In the display tube, by partially or completely removing the insulating layer at the bottom of the glass spacer, the glass spacer is fixed with frit glass onto the exposed glass substrate, and a grid electrode is connected through the glass spacer. A fluorescent display tube characterized in that it is fixed.