Arrangement for generating a beam current indicative signal

Details Arrangement for generating a beam current indicative signal Arrangement for generating a beam current indicative signal

1992-02-25

1993-01-05

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

315371, H01J 2952

Patent

active

051774135

ABSTRACT:
In a vertical deflection circuit, a vertical deflection current is controlled by a vertical sawtooth signal. A transistor generates a first control signal that is derived by sensing the beam current. The control signal is used for modulating the vertical sawtooth signal to compensate for a tendency of the raster height on a screen of a cathode ray tube to increase when the ultor voltage decreases. The transistor also clamps a second control signal that is indicative of the beam current to a predetermined level when the beam current is smaller than a predetermined value. The second control signal is coupled to an automatic beam current limiter.

REFERENCES:
patent: 3541240 (1970-11-01), Curtis
patent: 4067048 (1978-01-01), Norman
patent: 4167025 (1979-09-01), Willis
patent: 4752722 (1988-06-01), Erratico et al.
Schematic Diagram Sheets 1, 2, 3, 5, A and M1 of Television Receiver Circuit CTC 168/169.
A schematic of a Television Receiver Chassis, CTC168/169.

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