High potential static discharge means for television cathode ray

Details High potential static discharge means for television cathode ray High potential static discharge means for television cathode ray

1977-12-21

1980-08-12

Segal, Robert

Electric lamp and discharge devices

Cathode ray tube

Envelope

H01J 2900, H01J 3100

Patent

active

042175216

ABSTRACT:
This disclosure depicts a television picture tube subject to an undesired build-up of localized high-potential static charges and high-potential charge retention. The tube is characterized by a resistive coating deposited on at least one of the normally uncoated outer areas of the tube and in contact with the conductive coating to disperse any static charges by means of a flow of electrons through the resistive coating. The "rush" of electrons which may cause an annoying crackling sound upon tube turn-on and turn-off is attenuated thereby to suppress the sound, and any residual high-potential charges remaining after turn-off are discharged to ground.

REFERENCES:
patent: 803907 (1927-06-01), Delsing et al.
patent: 2409514 (1946-10-01), Pratt
patent: 2771566 (1956-11-01), Baracket
patent: 3959686 (1976-05-01), Davis et al.
patent: 3996491 (1976-12-01), Larson et al.

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