METHOD OF PREPARATION OF INITIAL DATA FOR CALCULATION OF CORRECTING LENSES Russian patent published in 1996 - IPC

FIELD: electronics. SUBSTANCE: system of electromagnets for deviation of electron beam in perpendicular planes is additionally anchored on neck of kinescope which screen is manufactured with the use of reference lens. Electron beam is deviated along one and then along other axes when deviation system is de-energized. Proportionality factors between currents (voltages) ofelectro-magnets and corresponding movements of electron traces on screen are determined by cutting in of power supply of deviation system. Colour purity is controlled by means of electromagnets and convergence in the center of screen-with the help of convergence magnets. Obtained values of currents (voltages) of electromagnets are taken in this case as points of counting. Then specified control of colour purity over field of screen is obtained by movement oif deviation system. Matching of centers of electron trace and luminophor element is performed at check points with the aid of electromagnets, movement of traces of electron beam are determined by curreents (voltages) of electromagnets. Directions of electron beam hitting the screen are found by formulas. EFFECT: enhanced efficiency of method. 5 dwg, 2 tbl