205044 ⎘
Details of cathode-ray tubes or of electron-beam tubes of the types covered by group; Arrangements of electrodes and associated parts for generating or controlling the ray or beam, e.g. electron-optical arrangement; Arrangements for focusing or reflecting ray or beam; Electrostatic lenses producing fields exhibiting symmetry of revolution co-operating with or closely associated to an electron gun
Method and structure of converging electron-emission source of field-emission display
#2Cathode-ray tube having an electron gun with an improved main focus lens
#3Method and structure of converging electron-emission source of field-emission display