| 摘要 |
IN A COLOR CATHODE RAY TUBE APPARATUS, THREE ELECTRON BEAMS (15) EMITTED FROM CATHODES FORM CROSS-OVER POINTS (21) AND ARE DIVERGED FROM THE CROSS-OVER POINTS, RESPECTIVELY. EACH OF THE DIVERGED ELECTRON BEAM ARE GUIDED THROUGH A FIRST QUADRUPLE ELECTRON LENS (QPL1), A SUB-LENS (SL), A SECOND QUADRUPLE ELECTRON LENS (QPL2), AND MAIN LENS (ML) TO A PHOSPHOR SCREEN (12). THE SUB-LENS HAS LENS POWERS FOR CONVERGING THE ELECTRON BEAMS. THE FIRST QUADRUPLE ELECTRON LENS (QPL1) HAS FIRST HORIZONTAL AND VERTICAL LENS POWERS FOR DIVERGING AND COVERGING THE ELECTRON BEAM IN THE HORIZONTAL AND VERTICAL PLANES, RESPECTIVELY. THE SECOND QUADRUPLE ELECTRON LENS (QPL2) HAS SECOND HORIZONTAL AND VERTICAL LENS POWERS FOR CONVERGING AND DIVERGING THE ELECTRON BEAM IN THE HORIZONTAL AND VERTICAL PLANES, RESPECTIVELY. THE MAIN LENS HAS A FOCUSING LENS POWER FOR FOCUSING THE ELECTRON BEAM ONTO THE SCREEN (12). THE FIRST AND SECOND HORIZONTAL AND VERTICAL LENS POWERS AND THE FOCUSING LENS POWER IS VARIED DEPENDING ON A DEFLECTION OF THE ELECTRON BEAM. THE HORIZONTAL LENS POWER OF THE FIRST QUADRUPLE ELECTRON LENS (QPL1) IS SO VARIED AS TO SUBSTANTIALLY CANCEL THE HORIZONTAL LENS POWER OF THE SUB-LENS (SL) IN THE HORIZONTAL PLANE.
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