Modern Cathode-Ray Tubes (CRT) Magnetic Deflection Systems Aberrations Mathematical Model

Abstract

Rapid and continuous electronic industry development creates higher standarts for image reproduction devices, fromwhich cathode ray tubes (CRT) are currently most widely used, especially in reproduction of color images. Despite theintensive development of new technologies, like liquid crystal displays (LCD) and plasma displays (PDP), it is obviousthat classic CRT will dominate in the market in many years to come.Due to large electron beam deflection angles δ > 45° , the application of conventional magnetic deflection systems aberrationstheory to modern CRT is not accurate. Article analizes mathematical modelling aspects of modern deflection systems. Provided andsubstantiated the mathematical formulas required for aberrations modelling. The proposed model is based on curvilinear optical axistheory. Demonstrated that paraxial approach to deflection aberrations appears as astigmatism. Given method can be easily extended tohigher level aberrations modelling. Ill. 1, bibl. 5 (in Lithuanian; summaries in Lithuanian, English and Russian.).