Heater for an indirectly heated cathode

Details Heater for an indirectly heated cathode Heater for an indirectly heated cathode

1980-09-17

1982-10-19

Dixon, Harold A.

Electric lamp and discharge devices

Electrode and shield structures

Indirectly heated cathodes

313340, 313341, 313344, 313356, H01J 120

Patent

active

043552595

ABSTRACT:
In a cathode heater, the portion of the coil adjacent to the emitting surface of the cathode has a smaller pitch or is covered with an oxide coating of lower capacity of heat per unit of length than the distant portion. As a result, the emitting surface is heated-up very quickly, and in a picture tube, for example, the picture comes on after a very short time. The heater according to the invention can be exchanged for a conventional heater without electrical and mechanical changes.

REFERENCES:
patent: 1858676 (1932-05-01), McCullough
patent: 2041904 (1936-05-01), Cone
patent: 2917650 (1959-12-01), DeCaumont
patent: 3255375 (1966-06-01), Ward

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