Televison camera comprising a pick-up tube

Details Televison camera comprising a pick-up tube Televison camera comprising a pick-up tube

1979-06-04

1981-02-03

Martin, John C.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358223, H04N 534

Patent

active

042492157

ABSTRACT:
A television camera comprising a pick-up tube provided with a directly heated cathode which is connected to a heater voltage source which is implemented as a pulse voltage source, the pulse heater voltage being present in at least a portion of the line blanking periods and absent in the line scanning periods. This enables the use in the pick-up tube of a directly heated cathode which has a higher efficiency between the electron emission and heater voltage power than an indirectly heated cathode.

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