H01J29/626 - CPC Classification

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 periodic axial symmetry, e.g. multipolar fields

• H01J29/628 » {co-operating with or closely associated to an electron gun} 0