Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits
Patent
1976-04-29
1978-08-01
Wilbur, Maynard R.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Cathode-ray deflections circuits
315367, H01J 2956
Patent
active
041045661
ABSTRACT:
A compensation circuit for use in a display system for displaying graphical images on an energy responsive surface with a radiant energy beam. The compensation circuit linearizes the relation between a control signal and the amount of deflection of the radiant energy beam upon the radiant energy responsive surface. A nonlinear circuit provides an extremely accurate compensation signal which is non-monotonically related to the magnitude of the control signal. When the control signal is combined with the compensation signal, a compensated deflection control signal is provided having a compensation signal component which generally diminishes for increasing deflections of the radiant energy beam. The amount of circuitry necessary to provide four quadrant compensation is diminished by providing a compensation signal based upon only one quadrant, and then switching the sign of the compensated deflection signal so produced to correspond to the desired deflection direction. Potentiometers are included which provide small variations in the compensation circuit response in different quadrants so as to correct for nonsymmetries in the deflection system. Also, independent on-axis and off-axis correction signals are produced so as to simplify alignment procedures. The on- and off-axis correction signals are then combined to provide the total compensation signal.
REFERENCES:
patent: 3205377 (1965-09-01), Nix, Jr.
patent: 3512039 (1970-05-01), Klensch
patent: 3763393 (1973-10-01), White
patent: 3786477 (1974-01-01), Baumgartner
patent: 3825796 (1974-07-01), Bello
Blum T. M.
Harris Corporation
Wilbur Maynard R.
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