JPS6327418Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a fluorescent display tube, and particularly to a structure effective for manufacturing dot display substrates that require high-density printing.

This will be explained below with reference to the drawings.

FIG. 1 shows a partially cutaway perspective view of a fluorescent display tube with a 5.times.7 dot display. That is, for example, the airtight container 1 along with the exhaust pipe 1 and the cover glass 2
For example _, as _{shown in FIG .}
The filament supports 6 ₁ , 6 ₂ (not shown) are formed by forming dot display electrodes of phosphor in the format and feeding power from external power supply terminals 8 ₁ , 8 ₂ , . . .
In the meantime, the electrons emitted from the suspended filaments 7 ₁ , 7 ₂ are accelerated and controlled by the grits 5 ₁ , 5 ₂ , and so on and impact the dot display electrodes to select alphabets, kana letters, numbers, symbols, etc. When using the thick film printing method, when the distance between the displayed dots is 1.2 mm or less for a fluorescent display tube that displays
From the viewpoint of printing accuracy, it is easier to manufacture if two or more insulating layers are formed. That is, by narrowing the distance between printed lines and making the line width thinner, shots and wire breaks occur frequently, resulting in a decrease in yield.

Therefore, it is necessary to inspect the board at each printing process.

In the conventional configuration, wiring was performed as shown in Fig. 3. In order to electrically detect this, the points connecting the external power supply terminals 8 ₁ , 8 ₂ , ... and the dot display electrodes (usually , 9 ₁ , 9 ₂ , ..., 9 ₈ (hereinafter referred to as through holes) need to be contacted with the terminals of the equipment that inspects shorts and disconnections, but the through holes are usually as thin as the wiring width. Because of this requirement, not only can it be destroyed by mechanical contact, causing shorts or disconnections, but it is also complicated to make test terminals.

The purpose of this invention is to provide a fluorescent display tube that solves the above-mentioned problems caused by the conventional wiring configuration by providing terminals 10 ₁ , 10 ₂ , . . . , 10 ₈ exclusively for inspection as shown in FIG. It is in.

According to the present invention, glass forms a power supply line, an insulating layer, a base electrode, a display electrode, etc. on an insulating substrate such as ceramic, and forms part of the envelope of a vacuum-tight container containing a filament, a grid, etc. A fluorescent display tube is obtained, which is characterized in that a terminal is provided at a point on the power supply line connected to the display electrode or at a point other than the external power supply terminal.

An embodiment of the present invention will be described below with reference to FIG.

Figure 4 shows the substrate of a fluorescent display tube, in which a power supply line printed with silver, an insulating layer made of glass, a base electrode made of graphite, etc. are formed on an insulating substrate made of glass or ceramic, and display electrodes made of phosphor are formed. This shows the power supply line structure, and shows _an example of a dot display board that requires particularly high-density _{printing .
08} is newly added to the conventional power supply line at the farthest position from the external power supply terminal.

That is, the test terminals 10 ₁ , 10 ₂ ,..., 10 ₈
is a valid terminal only for this printed layer, so
Even if a product is destroyed during inspection, it is covered with an insulating layer in the next process to eliminate its function, or is left completely unattended, so not only does it not cause problems like in the past, but it can also be inspected in areas that are easy to inspect. Another advantage is that it can be easily formed into an array.

Although one embodiment of the present invention has been described above, the present invention is not limited by the position, size, shape, etc. of the test terminal, nor is it limited by the use of display etc. it is obvious.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway perspective view of a fluorescent display tube to which the present invention is applicable. FIG. 2 is a diagram of a phosphor pattern to which the present invention can be applied. FIG. 3 is a diagram of a conventional power supply line pattern. FIG. 4 is an example of a pattern of a power supply line provided with the inspection terminal of the present invention. DESCRIPTION OF SYMBOLS 1... Exhaust pipe, 2... Cover glass, 3... Glass substrate, 4... Fluorescent material, 5... Grid, 6...
...Filament support, 7...Filament, 8
...External power supply terminal, 9...Through hole, 10...
Inspection terminal of this invention.

Claims (1)

[Scope of utility model registration request] A fluorescent display tube characterized in that a terminal area for inspection is provided on a power supply line to an electrode of the fluorescent display tube at a position farthest from an external power supply terminal.