JPS583340B2 - Multi-digit fluorescent display tube - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fluorescent display tube, and more particularly, to a fluorescent display tube, in which heat is radiated from a filament provided in a vacuum-tight container formed of two insulators, at least one of which is a flat insulator. A multi-digit fluorescent display that displays multi-digit numbers and symbols by controlling the acceleration of electrons using an electric field generated by a signal voltage applied to the grid and selectively impacting the phosphor layer coated on the anode segment. This relates to a lead extraction structure for a tube.

Conventional lead extraction structures for multi-digit fluorescent display tubes include brazing a ceramic substrate, welding the leads to a stem lead, and leading them out of the cylindrical tube, or using silver printed terminals formed on a glass substrate. There were things like that.

For the former, skill is required to weld the lead terminals brazed on the ceramic board to the stem leads.
It takes a lot of manufacturing man-hours and there are many defects caused by welding, which increases manufacturing costs and reduces product reliability.Furthermore, products with this structure require lead processing when mounted on a printed board. It also had the disadvantage of being complicated.

On the other hand, in the case of lead terminals made of silver print, when a voltage is applied under high temperature and high humidity, a migration phenomenon occurs due to electrolysis of silver, resulting in dielectric breakdown between the electrodes.

SUMMARY OF THE INVENTION An object of the present invention is to provide a multi-digit fluorescent display tube with a new structure that overcomes the drawbacks of lead extraction of the conventional multi-digit fluorescent display tubes as described above.

According to the present invention, thermionic electrons emitted from a filament provided in a vacuum-tight container are accelerated and controlled by an electric field generated by a potential applied to a grid, and impact a phosphor layer coated on an anode segment. In a multi-digit fluorescent display tube that displays multi-digit numbers and symbols, grid drawer leads arranged corresponding to the display digits are provided by penetrating the sealed part of the airtight container, and There is obtained a multi-digit fluorescent display tube characterized in that the anode display segment lead is provided in the same plane as the grid lead-out lead and penetrates the sealing part.

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

As shown in FIG. 1, the grid plate 1 has grids 2 corresponding to the display digits, and each grid 2 is supported by a frame member 4 having upper and lower tongue pieces 3a and 3b. It is formed into a set.

Further, as shown in FIG. 2, the spacer 5 has upper and lower tongue pieces 6a, 6b and a frame member 7 corresponding to each tongue piece 3a, 3b of the grid plate 1 and each frame member 4, respectively. ing.

Both the grid plate 1 and the spacer 50 are
The tongue pieces 3a, 3b and 6at5 are overlapped with each other.
Alternatively, the frame members 4 and 7 are fixed to each other by spot welding or the like to form the grid structure A.

Next, as shown in FIG. 3, the anode substrate 8 has display segments 9 each having a phosphor layer formed thereon corresponding to the display digits, in other words, each grid 2. Notches 10a and 10b are formed at the top and bottom of each display segment 9, and apart from this, on the side of the notch 10a,
Lead terminals 11 of each display segment 9 are taken out.

Further, as shown in FIG. 4, the support body 12 has upper and lower fitting parts 13a and 13b corresponding to the positions of the respective notches 10a and 10b, and a space between these fitting parts 13a and 13b. The connected support portion 14 and both fitting portions 13a, 1
Leads 15at15b are pulled out vertically from 3b.
and a lead 16 corresponding to the lead terminal 11,
Each lead 15a, 15b and 16 is commonly connected by a series of lead members 17a, 17b on each side.

Then, the upper and lower fitting portions 13a and 13b of the anode substrate 8 and the support body 12 are fitted together, and the substrates are supported by the support portion 14 from the back side and overlapped, and the lead terminals 11 on the anode substrate 8 are connected to each other. The anode substrate structure B is fixed to the lead 16 of the support 12 by welding or the like.

Then, the grid structure A is superimposed on the anode substrate structure B so that each grid 2 of the structure A matches each display segment 9 of the structure B, and each upper and lower fitting portion 13a, 13b of the structure B is placed. and each tongue piece 3at3b and 6a of structure A
, 6b are fixed by welding or the like, and each grid and spacer of the structure A is separated into individual pieces to obtain the display electrode structure C.

Further, a filament 18 is stretched over the display electrode structure C thus obtained, and the lead of this filament 18 is connected to a lead 19a which is connected to the lead members 17a and 17b.
, 19b and after attaching the required parts to the getter, it is installed inside the boat-shaped valve 20 as shown in FIG. These are then covered with a face plate 21 and sealed with low melting point glass or the like.

In this sealing, one of the leads 15a and 15b serving as the leads of each grid 2, each lead 15b in FIG. 6, is cut out, and the selection is made arbitrarily depending on the final shape of the product.

As an example of this selection, for example, to widen the width of the face plate 21 so that it can be inserted into a printed board connector,
It is better to take out the filament leads 19a, 19b and the grid leads 15a, 15b in the same direction as the display segment glue 16.

That is, as shown in FIG. 8, if the filament glue 19a, the segment lead group 16, and the grid lead group 15a are drawn out in the same direction,
Filament lead 19b, grid lead 15b
Since the display tube can be cut into short pieces, it goes without saying that the display tube can be made small from the beginning, and the drawbacks of conventional display tubes can be sufficiently improved.

In other words, the silver migration phenomenon naturally disappears completely, and the lead processing when mounting the display tube is
Needless to say, it is simpler and more efficient to produce the leads, and by providing the anode segment leads between the grid leads, it can be produced at lower cost.

Furthermore, since the leads are pulled out linearly from the grid, the occurrence of defects such as disconnections and welds is also reduced.

Therefore, in a flat display tube like the product of this invention, the grid leads corresponding to the display digits are pulled out,
If a structure is adopted in which the anode segment leads are pulled out between the leads, advantages in manufacturing the display tube and advantages in use will be obtained, and the economic effect thereof will be extremely large.

The present invention has been described above with reference to one embodiment, and the effects regarding the lead terminals can be achieved even if the internal structure of the display tube or the shape of the envelope changes, and even if the shape of the leads changes. Furthermore, due to the relationship between the number of anode segments and the number of grids, even if the anode segment leads are not arranged between all the grid leads, conversely,
If some of the anode segment leads are arranged outside one or both of the grid leads along the direction in which the grid leads are pulled out, the effect remains the same, and the present invention is not limited by these conditions. It is clear that this is not the case.

[Brief explanation of the drawing]

1 to 6 show the manufacturing process of an embodiment of a multi-digit fluorescent display tube according to the present invention, in which FIG. 1 shows a grid plate, FIG. 2 shows a spacer, FIG. 3 shows an anode substrate, and FIG. The figure shows the support, 5th
This figure and FIG. 6 are perspective views in which essential parts of the structure of the multi-digit fluorescent display tube are cut away during the manufacturing process. 1... Grid board, 2... Grid,
3a, 3b... tongue piece, 4... frame member,
5... Spacer, 5a, 5b... Tongue piece, 7... Frame member, 8... Anode substrate, 9
...Display segment, 10a, 10b...notch, 11...lead terminal, 12...
Support body, 13a, 13b... Fitting portion, 14...
...Support part, 15a, 15b, 16...Lead, 17a, 17b...Lead member, 18.
...Filament, 19a, 19b...
Lead, 20...Bulb, 21...Face plate, A...Grid structure, B...Anode substrate structure, C...Display electrode Structure.

Claims (1)

[Claims] 1 Thermionic electrons emitted from a filament installed in a vacuum-tight container are accelerated and controlled by the electric field generated by the potential applied to the grid, and the phosphor layer coated on the anode segment is bombarded with multi-digit radiation. In a multi-digit fluorescent display tube that displays numbers and symbols, grid lead-out leads arranged in correspondence with display digits are provided to penetrate the sealing part of the airtight container, and an anode is placed on the side of the grid lead-out leads and between them. A multi-digit fluorescent display tube, characterized in that a display segment lead is provided in the same plane as the grid lead-out lead, penetrating the sealing part.