Facsimile and static presentation processing – Facsimile – Recording apparatus
Patent
1978-12-22
1980-09-23
Richardson, Robert L.
Facsimile and static presentation processing
Facsimile
Recording apparatus
358243, 358 74, H04N 568
Patent
active
042246407
ABSTRACT:
In a television picture display device wherein a cathode of a picture display tube is driven by an emitter-follower and a control signal for a beam current reference level control circuit is obtained from the collector circuit of this emitter-follower, measures are taken to compensate for leakage currents from and to the cathode. To this end a blacker-than-black current compensation circuit is provided while furthermore it is ensured that the blacker-than-black curent can be processed by the beam current reference level control circuit.
REFERENCES:
patent: 3598913 (1971-08-01), Janssen
Amsen Willem H.
Hovens Paulus J. M.
Smeulers Wouter
Tryzna Miloslav
Briody Thomas A.
Goodman Edward W.
Richardson Robert L.
Streeter William J.
U.S. Philips Corporation
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