Color cathode ray tube apparatus
AssigneeMatsushita Electronics Corporation
InventorsShigeya Ashizaki, Koichi Sugahara, Hideo Muranishi, Masao Natsuhara
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Abstract
In a cathode ray tube apparatus having an in-line type electron gun, the focusing grid of the quadrupole electric field (8) which comprises the horizontal-electric-field boosting grids (11) and (11') and the vertical-electric-field boosting grids (12) and (12') is disposed between the first focusing grid (7) and the second focusing grid (9).
Claims10
A color cathode ray tube apparatus which uses three electron beams, comprising:
- a first focusing grid to which a first focusing voltage is to be applied;
- a second focusing grid to which a second focusing voltage is to be applied;
- means for generating a quadrupole electric field between said first focusing grid and said second focusing grid, said generating means including at least one horizontal-electric-field boosting grid connected with said first focusing grid for said three electron beams and at least one vertical-electric-field boosting grid connected with said second focusing grid for said three electron beams;
- wherein at least one of said horizontal-electric-field boosting grid and said vertical-electric-field boosting grid are applied with a focusing voltage which varies responding to the change in the deflection angle of the electron beams.
A color cathode ray tube apparatus which uses three electron beams, comprising:
- a first focusing grid to which a first focusing voltage is to be applied;
- a second focusing grid to which a second focusing voltage is to be applied;
- means for generating a quadrupole electric field between said first focusing grid and said second focusing grid, said generating means including at least one horizontal-electric-field boosting grid for said three electron beams and at least one vertical-electric-field boosting grid for said three electron beams;
- a third focusing grid to which a focusing voltage is applied, said focusing voltage being a same voltage level as that applied to one of said first and said second focusing grids, said third focusing grid disposed between said horizontal-electric-field boosting grid and said vertical-electric-field boosting grid;
- wherein at least one of said horizontal-electric-field boosting grid and said vertical-electric-field boosting grid are applied with a focusing voltage which varies responding to the change in the deflection angle of the electron beams.
A color cathode ray tube apparatus which uses three electron beams, comprising:
- a first focusing grid to which a first focusing voltage is to be applied;
- a second focusing grid to which a second focusing voltage is to be applied;
- means for generating a quadrupole electric field between said first focusing grid and said second focusing grid, said generating means including at least one horizontal-electric-field boosting grid connected with said first focusing grid for said three electron beams and at least one vertical-electric-field boosting grid connected with said second focusing grid for said three electron beams;
- a third focusing grid to which a focusing voltage is applied, said focusing voltage being a same voltage level as that applied to one of said first or said second focusing grids, said third focusing grid disposed between said horizontal-electric-field boosting grid and said vertical-electric-field boosting grid;
- wherein at least one of said horizontal-electric-field boosting grid and said vertical-electric-field boosting grid are applied with a focusing voltage which varies responding to the change in the deflection angle of the electron beam.
Dependencies are inferred from the claim text.