(57) In an electron gun assembly, electron (BR, BG, BB) beams emitted from cathodes (KR,
KG, KB) are focused in first cross-over (CO1) and accelerated and controlled by grids
(G1, G2, G3) along three axes (ZR, ZG, ZB) arranged in-line. The controlled electron
beams (BR, BG, BB) are weakly converged by unipotential lenses (ELS) and are converged
in a vertical plane by a common single electron lens (VL1) having a lens power which
is varied in accordance with a horizontal or vertical deflection of the electron beams
(BR, BG, BB). The converged electron beams (BR, BG, BB) form second cross-over on
the axes (ZR, ZG, ZB) which are shifted along the axes (ZR, ZG, ZB) are diverged from
the second cross-overs (ZR, ZG, ZB). The diverged electron beams (BR, BG, BB) are
further focused and converged onto a screen (SCN) by a main lens (LEL).
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