Automatic peak beam current leveler system

Details Automatic peak beam current leveler system Automatic peak beam current leveler system

1979-12-12

1981-11-03

Ng, Jin F.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 34, 358243, H04N 568

Patent

active

042988861

ABSTRACT:
A peak beam current leveler for use in a television receiver system which is responsive to the magnitude of the beam current supplied to the cathode of the cathode ray tube (CRT) exceeding a predetermined peak level to adjust the cathode peak beam current accordingly. The cathode beam current is supplied by a gain controlled video amplifier to the cathode through the base-emitter junction of a transistor. The collector electrode of the transistor is connected with a resistor for providing a voltage level proportional to the peak beam cathode current. A comparator circuit is utilized to provide a gain control signal that controls the gain of the gain controlled video amplifier such that the higher the beam current the more gain reduction that occurs. Thus, the level of the peak current is automatically reduced to maintain good focusing of the display on the CRT.

REFERENCES:
patent: 3855614 (1974-12-01), Okada
patent: 3898381 (1975-08-01), Amsen
patent: 3927346 (1975-12-01), Spaanhake
patent: 4017681 (1977-04-01), Smeulers
patent: 4081838 (1978-03-01), Wheeler
patent: 4121252 (1978-10-01), Saiki

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