JPS5841635Y2 - fluorescent display tube - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a fluorescent display tube that eliminates deformation of the grid mesh and provides uniform light emission.

Generally, in a fluorescent display tube, a segment anode is printed on an insulating substrate such as glass to form a display part, and a grid mesh and a cathode are placed above the display part with terminals printed on the insulating substrate. Attach with molten glass etc. to
It is then sealed with a transparent cover glass.

FIG. 1 is a schematic plan view showing a conventional fluorescent display tube.

In the figure, 1 is an insulating substrate such as glass, 2 is a grid mesh having a support 2a for mounting on the insulating substrate 1, and 3 is a support 2a of the grid mesh 2 attached to a terminal printed on the insulating substrate 1. A fixing material such as molten glass for fixing or conductive paste for fixing conductive connections.

Incidentally, although the display section, cathode, cover glass, etc. of the segment anode are not shown, it is a matter of course that they are provided.

However, in conventional fluorescent display tubes, for example, statically driven fluorescent display tubes, the entire display area is supplemented with a single grid mesh, resulting in a large series structure, as shown in Figure 1. Therefore, thermal expansion occurs due to heat generation due to thermionic bombardment from the filament during the thermal process of the manufacturing process or during light emitting display.

Moreover, since the grid mesh is fixed to the insulating substrate that forms the display section, there is a difference in thermal expansion coefficient with the insulating substrate or a temperature difference with the insulating substrate. Distortion occurs due to

For example, a stainless steel grid mesh having a thickness of 50 to 80 Atm is deformed due to this difference in thermal expansion, and this is particularly noticeable in a series of large grid meshes.

As a result, the gap between the insulating substrate that forms the light-emitting display section and the grid mesh that diffuses the emitted electrons from the cathode becomes partially uneven, making it impossible to obtain a uniform light-emitting surface and causing significant deformation. In some cases, the grid mesh may come into contact (short circuit) with the display section or cathode of the insulating substrate, resulting in electrical and structural damage.

On the other hand, it is possible to prevent deformation by dividing the grid mesh into small pieces, but in this case, it is necessary to make conductive connections using conductive paste for each small piece of grid mesh, and it is also possible to prevent the deformation of the grid mesh by dividing it into small pieces. There were problems such as the need for connection wiring for each grid mesh.

Therefore, an object of the present invention is to provide a fluorescent display tube in which deformation of an insulating substrate on which a light-emitting display portion is formed due to expansion and contraction of a grid mesh can be suppressed, and a uniform light-emitting surface can be obtained.

In order to achieve this objective, the present invention provides a fireworks display with a grid mesh in which cuts are made from at least one side of the display surface that do not obstruct the display surface, and the remaining portion is used as an electrical connection. This invention relates to an optical display tube, and will be described in detail below using examples.

FIG. 2 is a schematic plan view showing an embodiment of the fluorescent display tube according to the present invention.

In the figure, reference numeral 4 denotes a grid mesh with cuts 4a made in a portion that does not interfere with the light-emitting display surface, and electrical connection maintained by connecting portions 4b at the ends.

With this configuration, even if there is a difference in thermal expansion between the insulating substrate 1 and the grid mesh 4 that form the light emitting display section, it is absorbed by the notches 4a, and the grid mesh 4 does not deform. Moreover, since the connectors are integrated by the connecting portion 4b, it is only necessary to use the conductive paste in at least one place for conductive connection and fixation.

FIG. 3 is a schematic plan view showing another embodiment of the fluorescent display tube according to the present invention, in which the notches 4a of the grid mesh 4 are made from both sides, and the electrical connection is made through the intermediate connecting portion 4b. It is something that maintains.

Therefore, the grid mesh 4 does not deform as described in FIG. 2.

As explained above in detail, according to the fluorescent display tube according to the present invention, the deformation due to the difference in thermal expansion between the insulating substrate forming the luminescent display portion and the radial mesh can be absorbed by the cuts. Therefore, the gap between the display section and the grid mesh can be kept uniform, resulting in the effect that uniform light emission can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a schematic plan view showing a conventional fluorescent display tube, and FIG. 2 is a schematic plan view showing an embodiment of the fluorescent display tube according to the present invention.
FIG. 3 is a schematic plan view showing another embodiment of the fluorescent display tube according to the present invention. 1... Insulating substrate, 2... Grid mesh, 2a... Support column, 3... Fixing material,
4...grid mesh, 4a...notch, 4b...connection part.

Claims (1)

[Scope of utility model registration request] A fluorescent display tube comprising a grid mesh in which cuts are made from at least one side in a portion that does not obstruct the display surface, and the remaining portion serves as an electrical connection portion.