JPS583339B2 - 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 emitted 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 bombarding the phosphor layer formed on the anode segment. This relates to a pipe lead drawer structure.

Conventionally, multi-digit fluorescent display tubes that display multi-digit numbers and symbols, etc. are (A) fluorescent display tubes that display one digit simply arranged side by side, and (B) filament supports. (C) The details of the structure are unknown, but the components and insulating spacers are placed on the board. There was a method in which containers were stacked together to form a vacuum-tight container using low-melting point glass and fixed at the same time.

However, in the case of (5) above, the wiring between the common segments of each digit becomes extremely complicated, and defects caused by the complexity of the wiring lead to a decrease in yield and increase the manufacturing cost. In the case of (B), although the assembly work is simplified, the cost of the substrate increases, and each support is placed near the display segment forming the phosphor layer. Because the soldered surface that fixes the body is exposed, the soldering material, which is easily oxidized and spattered, adheres to the surface of the phosphor during heat treatment, encapsulation, and exhaust processes, resulting in poor display. , and in the case of (C) above, there is no disclosure of the detailed structure or assembly method of the grid or filament other than the lead drawer of the display segment, but if the spacer is insulating, the part close to the display segment However, there were disadvantages such as display defects caused by static electricity.

Regarding the lead extraction structure of conventional multi-digit fluorescent display tubes, there are those in which the leads are brazed on a ceramic substrate and welded to the stem lead to lead them out of the cylindrical tube, and there are silver prints formed on a glass substrate. Some were equipped with terminals.

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 man-hours to manufacture, and there are many defects caused by welding, which has the disadvantage of increasing manufacturing costs.Furthermore, products with this structure have the disadvantage that lead processing is complicated when mounted on a printed board. I also had it.

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.

An object of the present invention is to provide a novel multi-digit fluorescent display tube that overcomes the above-mentioned conventional drawbacks.

According to the present invention, a multi-digit fluorescent display includes a plurality of pattern display portions each formed of segment electrodes coated with a fluorescent substance in a container formed by sealing a pair of envelopes. In the tube, at least a grid terminal lead-in line electrically connected to each grid in a direction substantially perpendicular to the arrangement direction of the pattern display part, and a filament terminal lead-in line integrally connected to the filament holding part. is led out through the sealed portion of the pair of envelopes and protrudes to the outside of the envelopes, thereby obtaining a multi-digit fluorescent display tube.

In particular, 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 the phosphor layer formed on the anode segment is bombarded. In multi-digit fluorescent display tubes that display multi-digit numbers and symbols, grid drawer leads are arranged corresponding to the display digits and drawn out in the vertical direction of the display tube container. Alternatively, a multi-digit fluorescent lamp characterized in that an anode display segment lead is provided between either one of the leads on the lower side, and is finished so that both the upper and lower parts of at least one of the leads of this grid drawer lead group can be used. You can also get a display tube.

Further, according to the present invention, in the multi-digit fluorescent display tube,
On both sides of the lead group including grid leads and anode display segment leads, filament leads drawn out in both the upper and lower directions of the display tube container are provided, and at least one part of the leads in the lead group including the filament leads and the grid leads is connected to both the upper and lower sides of the lead group. A multi-digit fluorescent display tube is also obtained, which is characterized in that it is finished in such a way that it can be used.

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

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

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

Both the grid plate 1 and the spacer 50 are superimposed on each other, and the tongue pieces 3a, 3b and 6a, 6b are stacked on top of each other.
Alternatively, the frame members 4 and 7 are fixed to each other by welding or the like to form the grid structure A.

Next, the anode substrate 8 has display segments 9 each coated with a phosphor layer corresponding to the number of display digits, in other words, each grid 2, as shown in FIG. Cutouts 10a and 10b are formed at the top and bottom of each display segment 9, and lead terminals 11 of the display segment 9 are taken out separately above.

Further, as shown in FIG.
3a, 13b, the support part 14 connecting these two fitting parts 13a, 13b, and these two fitting parts 13at13.
It has leads 15a, 15b drawn out vertically from b, and a lead 16 corresponding to the lead terminal 11, and the leads 15a, 15b, and 16 are commonly connected by a series of lead members 17a, 17b on each side. There is.

Both the anode substrate 8 and the support body 120 also have the support body 1 in each of the upper and lower notches 10at10b of the anode substrate 8.
The upper and lower fitting portions 13a and 13b of 2 are fitted together, and the substrates are supported by the support portion 14 from the back side and overlapped, and the lead terminal 11 on the anode substrate 8 is welded to the lead 16 of the support body 12. to form an anode substrate structure B.

Furthermore, on the anode substrate structure B, there is also a grid structure A.
are superimposed so that each grid 2 of structure A matches each display segment 9 of structure B, and each upper and lower fitting part 13a, 13b of structure B and each tongue piece 3a, 3b and 6a of structure A, 6b are fixed by welding or the like, and each grid and spacer of the structure A is cut into individual units to obtain a 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 installing the necessary parts such as the getter, connect the boat-shaped valve 2 as shown in Fig. 5.
The base plate 21 is installed inside the base plate 21, and is covered with a face plate 21 in combination with spacers and the like to provide a predetermined gap, and these are sealed with low melting point glass or the like.

When sealing is performed, one of the leads 15a and 15b, which becomes the lead of each grid 2, and each lead 15a in FIG. 6 is cut out, and the selection can be made arbitrarily depending on the final shape of the product. It will be done.

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 best to take out the filament leads 19a, 19b and the grid leads 15a, 15b in the same direction as the display segment glue 16, and as shown in FIG. When the grid glue 15a that is in the grid is cut out and the grid glue 15b that is not pulled out is left, the lead members 17a and 17b, which are also connected to the leads 19a and 19b of the filament 18, are connected to the respective display segments. Since the leads 16 group and the grid leads 15b group are isolated from each other, when decomposing the oxide cathode after evacuation, it is only necessary to apply a voltage to a part of the leads 16 and 15b group. It also makes it easier to make contact.

After evacuation, the filament 18 lead 19a
, 19b are separated from each lead 16, 15a or group of 15b before being sent to the aging process.

In this aging step, the filament 18 is energized through the beam 9a or 19b, and each grid 2
By applying the same or different voltages to the display segment 9 and the display segment 9, the surface of the phosphor layer of the display segment 9 is cleaned and the thermoelectron emission of the filament is stabilized.

In this process, these grid leads 15a or 1
For both the group 5b and the group 16 of display segment leads, if they are integrated, the risk of poor contact will be greatly reduced.

Furthermore, after aging, lead 1 of display segment 9
First, an inspection that can be done without having to separate the 6th group and the read 15a or 15b group of the grid 2 individually, such as inspection of display quality and brightness, is carried out.
The insulation test between each display segment 9 can be carried out in the last step when each lead 16, 15a or 15b group is separated individually.This reduces the deformation of each lead and improves the quality of the product. This can be achieved by improving the

Then, during this manufacturing process, if the insulation between each display segment is confirmed during the processing of the anode substrate 8, and the risk of deterioration in the subsequent process is sufficiently small, individual By adding a separation process into the parts, it becomes easy to mechanize the mounting process itself.

As detailed above, the structure of the present invention not only improves the conventional drawbacks, but also provides many advantages including the simplification of the manufacturing process as mentioned above, and its economic effects are extremely high. It's thick.

Furthermore, the structure of the present invention is effective even if the cutting method and order of the support are changed in order to effectively connect it to the printed board connector as described above. At the same time, the fitting part corresponding to this notch may be changed to match this, or the supporting part may be placed from the front side of the anode substrate and the = part turned to the back side to support the same. It goes without saying that the present invention is not limited by these changes.

According to the structure of the multi-digit fluorescent display tube of the present invention, the silver migration phenomenon is completely eliminated as a matter of course, and the lead processing when mounting the display tube becomes simple and efficient, and the printed board Needless to say, the fixation to the grid leads becomes more secure, and by providing the anode segment leads between the grid leads, the leads can be manufactured at a 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.

Although this invention has been described above with reference to one embodiment, 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,
It is effective even if some anode segment leads are placed outside one or both of the grid leads, and even if filament leads are placed on one or both sides of the lead group including the anode segment leads and grid leads. It is clear that this invention is not fixed by these conditions.

[Brief explanation of the drawing]

The drawings 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. 4 shows a support. , FIG. 5, 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, 6a, 6b... Tongue piece, I... Frame member, 8... Anode substrate, 9
...Display segment, 10a, 10b...
...Notch, 11...Lead terminal, 12...
... Support body, 13a, 13b ... Fitting part, 1
4...Support part, 15a, 15b, 16...
...Lead, 17a, 17b...Lead member,
18...Filament, 19a, 19b...
...Reed, 20...Valve, 21...
... Face plate, A ... Grid structure, B ...
・Anode substrate structure, C...Display electrode structure.

Claims (1)

[Claims] 1 Thermal electrons emitted from a filament installed in an airtight container formed by sealing a pair of envelopes are accelerated and controlled by a grid, and the phosphor provided in the display segment is In a multi-digit fluorescent display tube that displays digit numbers and symbols, a grid leader line, a filament leader line, and a display segment leader line are arranged in the pair of grid lead lines, filament lead lines, and display segment lead lines in a direction substantially perpendicular to the arrangement direction of the multi-digit display section. A multi-digit fluorescent display tube, characterized in that the tube is led out through a sealed portion of an envelope and protrudes outside the envelope.