H - Electricity – 04 – N
Patent
H - Electricity
04
N
350/40
H04N 5/228 (2006.01)
Patent
CA 1141460
26.2.79 1 PHN.9167 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.
330310
Himmelbauer Erich E.
Lohuis Willem J.
N.v. Philips Gloeilampenfabrieken
Van Steinburg C.e.
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