JPS5830053A - Flat display tube - Google Patents

Abstract

PURPOSE:To maintain correctly the spacing and relative positions between a flat control grid of a large area and a positive segment by mounting and fixing a flat electrode, by means of soldering glass of a low melting point, while combining said electrode with a flat substrate en bloc with a window frame-like jig which surrounds said flat electrode. CONSTITUTION:A window frame-like jig 4 is larger than a phosphor display face 1 and composed of a high temperature-resisting material e.g. stainless steel etc. Fig. shows a section, wherein a control grid 3 is sandwiched through an upper glass spacer 6, whereto non-conductive adhesives 7 such as frit glass is applied, and a weight for pressing the upper spacer 6 e.g. a glass plate 8 is placed thereon. When said structure is fired at a temperature of about 450 deg.C, the control grid 3 extends due to a rising temperature and frit is melted and solidified, while said control grid 3 shrinks at a dropping temperature and frit is kept solidified so as to correctly maintain the spacing, parallelism are relative positions at the required set values and to be kept extended.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the structure of a flat display tube. As a flat display element, for example, a fluorescent display tube is an anode segment having a phosphor layer that controls thermoelectrons emitted from a filament using a control grid and displays numbers and symbols on an insulating substrate such as ceramic, phosphor, or glass. The desired display is obtained by impacting the

Conventionally, a flat plate control grid in a small display tube such as a fluorescent display tube is a metal frame called a frame. The configuration is such that the spacing between the anode segments and the frame is preset by machining, and then the control grid is welded to the frame to obtain the desired spacing and relative position.

This configuration is effective when the area of the control grid is relatively small, but as the area of the control grid increases, the central part of the control grid becomes concave, making it difficult to obtain accurate spacing and relative position. there were.

SUMMARY OF THE INVENTION The present invention provides a flat display tube in which the spacing and relative position of a large-area flat control grid and anode segment can be accurately maintained at desired set values.

The present invention is characterized in that, in manufacturing a flat display tube, a flat electrode is integrated into a window frame-shaped jig surrounding the electrode, combined with a flat substrate, and attached and fixed with low melting point solder glass. .

Next, an embodiment of the present invention will be described with reference to all the drawings.

FIG. 1 shows the fluorescent display surface of the display tube.

In Figure X1, fluorescent dots 2 are applied on a fluorescent display surface 1 by screen printing or the like. Second
The figure shows a large-area flat plate control grid 3, and the area inside the circle in FIG. 2 is a partially enlarged view of the control grid 3.

FIG. 3 shows a window frame-shaped jig 4, and in FIG. 3, the window frame-shaped jig 4 is larger than the fluorescent display surface 1 and is made of a material that can withstand high temperatures, such as stainless steel. be done. Figure 4 shows the control grid 3 being electrically welded to the window frame jig 4 (
This is a diagram showing the state of welding and fixing by welding points (x marks). FIG. 5 is a diagram in which the control grid structure constructed as shown in FIG. 4 is placed on the lower glass spacer 5 which has been placed on the fluorescent display surface 1 in advance, with the welding point portion facing downward. In FIG. 5, the lower glass, spacer 5, is used to set the spacing between the anode segments and the control grid.

Furthermore, a non-conductive adhesive (not shown) such as frit glass is applied to the upper and lower sides of the lower glass spacer 5.

FIG. 6 shows that the control grid 3 is sandwiched between the control grid 3 shown in FIG. A main for pressurizing the glass and spacer 6,
For example, it is a sectional view with a glass plate 8 placed thereon. When the structure shown in Fig. 6 is fired at a temperature of approximately 450°C, the control grid 3 expands and the frit melts and solidifies as the temperature rises, and when the temperature falls, the control grid 3 contracts and the frit remains solidified, so the control grid 3 3 and the spacing and parallelism of the anode segments, and
It is possible to accurately push and tension the relative position to a desired set value.

As explained above, by welding and integrating a control grid to a window frame-shaped jig, this invention can accurately maintain the spacing and relative position of the large-area flat control grid and the anode segment, and is reliable. It is possible to provide a display tube with high quality.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of the fluorescent display surface of the display tube, FIG. 2 is a plan view of the large-area flat control grid, and FIG. 3 is a perspective view of the window frame-shaped jig.
Fig. 4 is a perspective view of a window frame-shaped jig with a control grid integrated by welding, Fig. 5 is a perspective view of the control grid structure mounted on a fluorescent display surface, and Fig. 6 is a perspective view of the control grid structure mounted on a fluorescent display surface. FIG. 6 is a sectional view of the structure shown in FIG. 5 with a glass spacer and a glass plate further mounted thereon. DESCRIPTION OF SYMBOLS 1... Fluorescent display surface, 2... Fluorescent dots, 3... Flat control grid, 4... Window frame-shaped jig, 5...・・・Lower glass, spacer, 6...
...Top glass, space f, 7...Non-conductive adhesive, 8...Glass plate.

Claims (1)

[Claims] A flat display tube characterized in that, in manufacturing the flat display tube, a flat electrode is integrated into a window frame-shaped jig surrounding the electrode, combined with a flat substrate, and fixed with low melting point glass.