Flat envelope type fluorescent character indicating tube with getter shield plate
AssigneeTokyo Shibaura Electric Co., Ltd.
InventorsYasamasu Mori, Kenzo Ashiuchi, Osamu Yasytome, Tagayasu Sawamura
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Abstract
In a flat type fluorescent character indicating tube wherein a plurality of digit indicating elements are arranged in an evacuated envelope, there is provided a getter support structure located adjacent one end of the envelope. The getter support structure includes a shield plate extending toward the inner surface of the envelope to minimize distribution of the getter film toward the location of the digit indicating elements. At least one filament is extended above the digit indicating elements and its one end is secured to the getter support structure at a location beyond the shield plate.
Claims7
A flat envelope type fluorescent character indicating tube comprising:
- a base plate;
- an envelope cover having a transparent conductive film at least partially on its inner surface, said envelope cover being sealed with said base plate for constructing an evacuated envelope;
- a plurality of digit indicating elements being arranged lengthwise on said base plate, each of said elements having a plurality of anode segments shaped to indicate predetermined indicia and a control grid for selecting the indicating digit location;
- a getter source container;
- a getter support structure located adjacent one end portion of said base plate and positioned thereon for supporting said getter source container and having a shield plate, said shield plate extending toward said inner surface of said envelope cover to minimize distribution of getter film toward the location of said digit element;
- and
- at least one elongate filament being extended above said digit indicating elements, one end of said filament being secured to said getter support structure at a location beyond said shield plate.
Dependencies are inferred from the claim text.