JPH031883Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fluorescent display tube, and more particularly to a grid structure of a fluorescent display tube that displays numbers, characters, symbols, figures, etc. by emitting light from fluorescent substances.

Conventionally, in this type of fluorescent display tube, as shown in the perspective and side views of Figures 1a and 1b, the anode feeder wire is provided with non-transparent Ag wiring on an insulating substrate, and then the black wire is connected via a through hole. an insulating layer is provided, and
Graphite 1 at the location corresponding to the through hole part
On an anode substrate 1, which is made up of electrodes such as 0, and a fluorescent substance 7 deposited thereon, a grid 3 is disposed at a position corresponding to the anode at an appropriate distance from the anode, and A filament cathode 4 is placed at an appropriate distance, and a cover glass 6 with a transparent conductive film formed on the inner surface is sealed with the anode substrate 1 to form a vacuum-tight container, and the display is observed from the cover glass side. In one structure, the anode substrate 1 is made transparent, the anode electrode group disposed on the anode substrate is made into a transparent electrode, and a fluorescent substance is applied thereon.
A structure has been provided in which the luminescence display from the fluorescent substance is observed from the opposite side of the anode substrate from the side on which the electrodes are formed.

In the following explanation, the structure of the grid mesh in DC voltage driving of these fluorescent display tubes will be described.

In conventional DC voltage-driven fluorescent display tubes, the spacers are paired, but the grid mesh deforms when a voltage is applied, resulting in
As shown in the figure, two or three breaks are provided that do not overlap the display pattern of letters, numbers, etc. Furthermore, since the distance from the filament 4 to the grid 3 is very important, generally a spacer is shaped to a specified dimension, and the grid 3 is placed on top of it and welded. It is necessary to provide pin holes to position and weld the spacer and grid. For this reason, conventionally, the pin holes 11 are generally provided on the outside of the grid mesh portion 31, as shown in FIGS. 2b and 4a. Therefore, (a) since the grid is divided into sections, it tends to become an asymmetric grid and lacks versatility.

(b) Since the pin holes are placed on the outside of the grid mesh, the grid becomes larger.

There were some shortcomings.

The purpose of the present invention is to eliminate these drawbacks and provide a grid that is versatile and inexpensive.

According to the present invention, there is obtained a fluorescent display tube characterized in that a positioning hole is provided inside the grid mesh. In particular, according to the present invention, power is supplied to a conductive material such as graphite through a power supply line formed on an insulating substrate within a vacuum-tight container formed of a transparent display window and an insulating substrate such as glass or ceramic. Grids are used in fluorescent display tubes that display arbitrary numbers, letters, symbols, etc. by accelerating and controlling thermoelectrons from a filament and impacting them on a phosphor layer formed in a display pattern on the conductive material. A fluorescent display tube is obtained in which the positioning jig hole is located inside the grid mesh.

Hereinafter, the present invention will be explained with reference to FIGS. 3a and 3b and 4a and 4b. FIG. 3a is a perspective view of the electrode assembly of the DC voltage driven single grid mesh according to the present invention, and FIG. 3B is a plan view of the DC voltage driven single grid mesh according to the present invention. Also, Figure 4a
4 is a plan view of a conventional pulse voltage driven grid mesh, and FIG. 4b is a plan view of a pulse voltage driven grid mesh of the present invention.

As shown in FIGS. 3a and 3b, the material of the grid mesh 31 of the present invention is made of the same material as the spacer, such as 426 alloy or 52 alloy, rather than stainless steel.
The thermal expansion coefficients are approximately the same to prevent thermal deformation during sealing or deformation of the grid mesh due to current when a voltage is applied, and there is no intermediate partition, resulting in a fluorescent display tube that uses a single grid mesh. be able to. In addition, by doing this, a pin hole 11 necessary for welding with a spacer is provided in the grid mesh, the width of the entire grid mesh is reduced, and assembly is simplified. In addition, by using a single grid mesh 32, even if the spacer shape is slightly different, the frame dimensions of only the display pattern part are the same, so it can be easily used for other products, and both sides (front and back) can be used during assembly. Therefore, it has the advantage of preventing mistakes. Furthermore, the number of chamfers per sheet at the etching manufacturer increases, which leads to cost reductions and enables the provision of cheaper fluorescent display tubes. Further, although the above description has been about DC voltage drive, stainless steel grids can be used in dynamically driven fluorescent display tubes because the input power is small. Even in this case, it goes without saying that the number of chamfers per sheet can be increased.

[Brief explanation of the drawing]

FIGS. 1a and 1b are a perspective view and a side view of a fluorescent display tube. FIG. 2a is a perspective view of an electrode assembly of a conventional DC-driven grid mesh. FIG. 2b is a plan view of a conventional DC-driven divided grid mesh. FIG. 3a is a perspective view of the electrode assembly of the DC voltage-driven one-piece grid mesh according to the present invention. FIG. 3b is a plan view of a one-piece grid mesh driven by DC voltage according to the present invention. FIG. 4a is a plan view of a conventional pulse voltage driven grid mesh. FIG. 4b is a plan view of the pulse voltage driven grid mesh of the present invention. 1... Anode substrate, 2... Spacer, 3... Grid, 4... Filament, 5... Getter, 6
... Cover glass, 7 ... Phosphor, 8 ... Nesa terminal, 9 ... Exhaust pipe, 10 ... Graphite, 11
...pin hole.

Claims (1)

[Scope of utility model registration request] Power is supplied to a conductive material such as graphite through a power supply line formed on an insulating substrate in a vacuum-tight container formed of a transparent display window and an insulating substrate such as glass or ceramic, and In a fluorescent display tube that displays numbers, letters, symbols, etc., thermionic electrons from a filament are accelerated and controlled by a grid to impact a phosphor layer formed in a display pattern. A fluorescent display tube characterized in that the mounting hole is located inside the grid mesh.