Title :
Calculation of manufacturing tolerances of an electron gun by a pseudo-three dimensional field analysis
Author :
Okuda, S. ; Ikegami, K. ; Yoshida, T. ; Nosaka, E. ; Nakanishi, H.
Author_Institution :
Mitsubishi Electr. Corp., Amagasaki, Japan
fDate :
7/1/1989 12:00:00 AM
Abstract :
A method of calculating the electric field of nearly rotationally symmetric electrodes has been developed. The field is calculated by superposing virtual surface charges on the electrodes. The method has the advantages of speed and sensitivity to deviations from symmetry. The method is used to calculate the tolerances of the electrodes in an electron gun to deviations of the holes from roundness. The shift of the beam spot due to an asymmetrical chamfer is calculated by tracing the electron beam using the electric fields calculated by this method. The calculated tolerance gives good agreement with the empirical tolerance. The calculated magnitude of the shift agrees with experimental results for a test electron gun
Keywords :
electric fields; electron guns; 3D field analysis; asymmetrical chamfer; electric field; electron beam; electron gun; manufacturing tolerances; rotationally symmetric electrodes; sensitivity; virtual surface charges; Cathode ray tubes; Charge carrier processes; Electrodes; Electron beams; Integral equations; Laboratories; Manufacturing; Maxwell equations; Production facilities; Testing;
Journal_Title :
Magnetics, IEEE Transactions on
