ELECTRON-BEAM IRRADIATION METHOD AND DEVICE (ALTERNATIVES)

摘要

FIELD: electronic engineering. ^ SUBSTANCE: proposed method and device make use of triangular-wave generator that produces triangular-waveform current signal conveyed to scanning coil for electron beam displacement in first scanning direction Y and rectangular-wave generator that produces rectangular-waveform current pulse arriving at deflection coil for displacing electron beam in second scanning direction X perpendicular to first scanning direction Y. Triangular-waveform current signal produced by triangular-wave generator is modulated to eliminate hysteresis effect in scanning coil. In addition, leading edge of rectangular-waveform current signal is timed at definite offset relative to peaks of triangular-waveform current signal so as to distribute return points on electron beam route in second scanning direction. ^ EFFECT: affording uniform scanning and eliminating hysteresis problems and heat concentration on diaphragm. ^ 10 cl, 18 dwg