Biasing clamp for a CRT

Details Biasing clamp for a CRT Biasing clamp for a CRT

1988-03-15

1990-01-16

Chin, Tommy P.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358188, 358184, H04N 544, H04N 568

Patent

active

048947253

ABSTRACT:
A diode clamp in a kine driver circuit clamps the voltage at the grid (G1) element of a picture tube to a level derived from the voltage at the cathode element of the picture tube. Deriving the grid (G1) voltage from the cathode voltage ensures that if the kine driver amplifier saturates, the voltage applied to the grid (G1) will always be less than that applied to the cathode. Thus, excessive beam current is prevented from flowing immediately following cold cathode turn-on, which excessive beam current would otherwise cause a phenomenon known as "focus flutter".

REFERENCES:
patent: 3449619 (1969-06-01), Stalp
patent: 4218720 (1980-08-01), Kam
patent: 4577234 (1986-03-01), Harlan
patent: 4604647 (1986-08-01), Peele
patent: 4631595 (1986-12-01), George
patent: 4639785 (1987-01-01), Tallant
patent: 4704631 (1987-11-01), Bell
RCA Color Television Service Data 1987 CTC140 p. 2-4.

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