Claims
- 1. A picture display tube comprising an envelope having a display screen, an electrode system mounted in said envelope for generating at least one electron beam directed onto said screen, a resistive layer poured on at least a portion of the interior surface of said envelope near said electrode system, said layer having a dynamic resistance of at least 300 ohms, a static resistance less than 10,000 ohms and comprising a mixture of graphite particles having an average size less than 2 microns and generally spherical ferric oxide particles having an average size less than 2 microns, and means for electrically connecting said layer to a source of high voltage.
- 2. The picture tube according to claim 1 wherein said dynamic resistance of said resistive layer is between 300 and 3,000 ohms.
- 3. The display tube according to claim 1 wherein said mixture includes an alkaki metal silicate.
- 4. The display tube according to claim 1 wherein the thickness of said layer is between 5 and 20 microns.
- 5. The display tube according to claim 4 wherein said mixture consists essentially of one part by weight of graphite, 1.5 to 3 parts by weight of alkali metal silicate and 6 to 10 parts by weight of ferric oxide.
Priority Claims (1)
Number |
Date |
Country |
Kind |
7605988 |
Jun 1976 |
NLX |
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Parent Case Info
This is a continuation of application Ser. No. 801,926, filed May 31, 1977 now abandoned.
US Referenced Citations (7)
Foreign Referenced Citations (1)
Number |
Date |
Country |
2262547 |
Jul 1973 |
DEX |
Continuations (1)
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Number |
Date |
Country |
Parent |
801926 |
May 1977 |
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