Television receivers

Details Television receivers Television receivers

1984-09-13

1986-09-16

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

315410, 315396, 358165, H01J 2952

Patent

active

046124845

ABSTRACT:
A line scanning circuit for an electrostatically deflected cathode ray tube uses two integrator circuits having single transistor amplifiers for complementary conductivity types with capacitive feedback to provide balanced sawtooth drive waveforms. The charges on the capacitors are reset by pulses at line frequency and the forward sweeps of the sawteeth are produced by current flowing from the input of one integrator to the input of the other integrator. A variable resistor in the current path provides width control and a transistor connected in series with the current path enables dynamic adjustment of the scan to be provided to suit the scanning characteristics of a flat cathode ray tube. A signal from the field scanning circuit during flyback is applied to turn off the transistor in the current path so that the spot is returned during field flyback up one side of the screen.

REFERENCES:
patent: 3922585 (1975-11-01), Andrews

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