JPH0319165Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a box-shaped fluorescent display tube, and particularly relates to the shape of a spacer member.

Conventionally produced box-type fluorescent display tubes generally have a group of anode segments that display numbers and symbols on an insulating substrate such as glass or ceramic, and a phosphor layer is coated on this group of anode segments. form,
The desired display is obtained by bombarding the phosphor layer with thermionic electrons emitted from the filament.
As shown in Fig. 1, a lead terminal 1 is pulled out from the long side of the box-shaped fluorescent display tube, and a short lead terminal 2
The lead terminals are also pulled out from the long sides of the box-shaped fluorescent display tube, but the lead terminals are not pulled out from the short sides of the box-shaped fluorescent display tube. Moreover, as shown in FIGS. 2a and 2b, the height of the spacer member made of glass or the like is uniform on both the long and short sides. but,
Since there is an opening 11 for embedding the exhaust pipe 3,
When the spacer is heated and melted, twisting occurs, often resulting in a step at the opening of the spacer.
Using a spacer with a step in such an opening, the third
As shown in the figure, when sealing layers 9a, 9b, and 9c of frit glass are applied to the hermetically sealed portion and pressed from above and below to form an airtight container, lead terminals are formed as shown in Figure 4. Since the correcting force is lost due to the thickness of the container, complete sealing cannot be achieved and a sealing hole 10 is formed, resulting in a disadvantage that an airtight container cannot be obtained.

An object of the present invention is to provide a new box-shaped fluorescent display tube that overcomes the above-mentioned drawbacks.

That is, the gist of the present invention is characterized by using a spacer in which a convex portion is locally provided near the opening on the short side of the spacer facing the insulating substrate. Therefore, even if there is a step at the opening of the spacer,
Due to the convex part provided on the spacer, the level difference is corrected by the height of the convex part by pressing the upper and lower plates during the sealing process, creating a completely airtight container and obtaining a highly reliable box-shaped fluorescent display tube. It is something.

The following will explain based on examples. Figure 5a,
FIG. 5b shows a spacer glass in which a convex portion 12 having a thickness equal to or less than the thickness of the lead terminal 1 is provided on the short side facing the substrate 6 near the opening 11 in which the exhaust pipe is embedded in the spacer facing the insulating substrate. Using this spacer, assemble the insulating substrate, lead terminals, face glass, and other parts, heat and melt the frit glass sealing layers 9a, 9b, and 9c of the hermetically sealed portion to seal them.
Even if the opening 11 of the spacer has a step in the airtight container, that is, the box-shaped fluorescent display tube shown in FIG. is prevented. In particular, if the height of the convex part is made equivalent to the thickness of the lead terminal, regardless of whether the step at the opening is large or small, the pressure between the upper and lower plates will correct the step and create the state shown in Figure 6, making it a reliable vacuum container. A box-shaped fluorescent display tube with high performance can be obtained. Although FIGS. 5 and 7 show the shape of the convex portion provided on the spacer, it goes without saying that the shape is not limited to this and any shape can be selected.

[Brief explanation of the drawing]

Figure 1 is a front view of a conventional box-shaped fluorescent display tube;
Figures a and b are front and side views showing the shape of a conventional spacer, Figure 3 is a sectional view of a conventional box-type fluorescent display tube before sealing, and Figure 4 is a conventional box-type fluorescent display tube sealed. A side view showing the hole, Figures 5a and b are a front view and a side view of a spacer provided with a convex portion based on the present invention, and Figure 6 is a spacer made using a spacer of the present invention provided with a convex portion. Side sectional view of a box-shaped fluorescent display tube,
FIGS. 7a and 7b are front and side views showing the shape of the convex portion of the spacer according to the present invention. 1...Lead terminal, 2...Short lead terminal, 3...
... Exhaust pipe, 4 ... Display segment, 5 ... Spacer glass, 6 ... Insulating substrate, 7 ... Display surface glass, 8 ... Grid, 9a, 9b, 9c ... Sealing layer, 10 ... Sealing Hole, 11...Opening, 12,1
2'...Protrusion.

Claims (1)

[Scope of utility model registration request] A box-shaped fluorescent display tube in which a pair of flat substrates are sealed together via a spacer member, and a lead terminal is drawn out between one of the substrates and the spacer member,
The spacer member has an opening between a side where the lead terminal is pulled out and a side where the lead terminal is not pulled out,
A box-shaped fluorescent display tube characterized in that a local convex portion is provided on the side facing one of the substrates near the opening on the side where the lead terminals are not drawn out.