US4701677A
Expired / Lapsed
US
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Color cathode ray tube apparatus
Assignee: Panasonic Holdings Corp
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Filing: 1985-07-29
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Granted: 1987-10-20
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Expires: 2005-07-29
Abstract
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).
Inventors
- 👤 Shigeya Ashizaki
- 👤 Koichi Sugahara
- 👤 Hideo Muranishi
- 👤 Masao Natsuhara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:50
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/46; H01J29/48; H01J29/50; H01J29/503; H01J29/58; H01J29/62; H01J29/626; H01J29/628
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
130 words
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.
Claim 2
Dependent Claim
130 words
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.
Claim 3
Dependent Claim
55 words
A color cathode ray tube apparatus in accordance with claim 1, wherein said horizontal-electric-field boosting grid has at least one plate grid having three vertically oblong windows which the electron beam passes through, and said vertical-electric-field boosting grid has at least one plate grid having three horizontally oblong windows which the electron beam passes through.
Claim 4
Dependent Claim
46 words
A color cathode ray tube apparatus in accordance with claim 1, further comprising a third focusing grid, to which a same voltage as that applied to said first and said second focusing grids is applied, disposed between said horizontal-electric-field boosting grid and said vertical-electric-field boosting grid.
Claim 5
Dependent Claim
43 words
A color cathode ray tube apparatus in accordance with claim 1, wherein said horizontal-electric-field boosting grid comprises four vertically disposed plates connected with said first focusing grid, and said vertical-electric-field boosting grid comprises two horizontally disposed plates connected with said second focusing grid.
Claim 6
Dependent Claim
26 words
A color cathode ray tube apparatus in accordance with claim 1, wherein said horizontal-electric-field hoosting grid and said vertical-electric-field boosting grid respectively comprise three semi-cylindrical plate
Claim 7
Dependent Claim
32 words
A color cathode ray tube apparatus in accordance with claim 1, wherein a surface of said first focusing grid which faces said second focusing grid is used as said horizontal-electric-field boosting grid.
Claim 8
Dependent Claim
165 words
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.
Claim 9
Dependent Claim
165 words
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.
Claim 10
Dependent Claim
57 words
A color cathode ray tube apparatus in accordance with claim 7, wherein said horizontal-electric-field boosting grid has at least one plate grid formed with three vertically oblong windows through which the electron beam passes, and said vertical-electric-field boosting grid has at least one plate grid formed with three horizontally oblong windows through which the electron beam passes.
Claim 11
Dependent Claim
177 words
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.
Claim 12
Dependent Claim
177 words
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.
Claim 13
Dependent Claim
57 words
A color cathode ray tube apparatus in accordance with claim 9, wherein: said horizontal-electric-field boosting grid has at least one plate grid formed with three vertically oblong windows through which the electron beam passes, and said vertical-electric-field boosting grid has at least one plate grid formed with three horizontally oblong windows through which the electron beam passes.
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