Claims
- 1. A color television display tube comprising an evacuated envelope, an electrode system disposed in said envelope for generating at least two electron beams, a display screen on an internal wall portion of said envelope, an electrically resistive layer for restricting currents produced during electric flash-overs provided on a portion of the internal wall of said envelope disposed between said electrode system and said display screen, a color selection means positioned in said envelope a predetermined distance from said screen, at least one metal contact spring disposed opposite said resistive layer, means for electrically connecting said spring to said color selections means, a contact face having an electrical conductivity at least ten times greater than the conductivity of said resistive layer and an area of at least 5 cm.sup.2 applied on said resistive layer between said layer and said spring for reducing the contact resistance therebetween to thereby reduce electromagnetic interference radiation generated by the display tube and means arranged in said envelope for maintaining said spring in engagement with said contact face to thereby electrically connect said color selection means of said resistive layer.
- 2. A display tube according to claim 1 wherein said contact face is in the form of a strip.
- 3. A display tube according to claim 2 including at least two of said contact springs in contact with said strip.
- 4. A display tube according to claim 2 wherein said strip is in the form of an annulus extending about the inner wall of said envelope.
- 5. A display tube according to claim 1 wherein said resistive layer comprises one part by weight of graphite powder, 6 to 10 parts by weight of iron oxide powder and 1.5 to 3 parts by weight of alkali metal silicate, and wherein said contact face comprises 60 to 90 parts by weight of graphite powder and 10 to 40 parts by weight of alkali metal silicate.
Priority Claims (1)
Number |
Date |
Country |
Kind |
7613806 |
Dec 1976 |
NLX |
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Parent Case Info
This is a continuation of application Ser. No. 764,347, filed Jan. 31, 1977, now abandoned.
US Referenced Citations (4)
Number |
Name |
Date |
Kind |
3621318 |
Lewinson |
Nov 1971 |
|
3639797 |
Fukushima et al. |
Feb 1972 |
|
3791546 |
Maley et al. |
Feb 1974 |
|
4092444 |
Kilichowski |
May 1978 |
|
Foreign Referenced Citations (2)
Number |
Date |
Country |
2232798 |
Jan 1973 |
DEX |
1226728 |
Mar 1971 |
GBX |
Continuations (1)
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Number |
Date |
Country |
Parent |
764347 |
Jan 1977 |
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