Electron gun for a color cathode ray tube
First Claim
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1. An electron gun for a color cathode ray tube comprising:
- a triode;
a focus electrode having a first plane and a second plane, the second plane including a plurality of electron beam passing holes;
parallel vertical blades formed along the perimeter of the electron beam passing holes of said focus electrode extending towards said triode;
a dynamic focus electrode having a first plane and a second plane, the first plane including a plurality of electron beam passing holes;
parallel horizontal blades formed along the perimeter of the electron beam passing holes of the first plane of said dynamic focus electrode, said parallel horizontal blades protruding into the electron beam passing holes of the second plane of said focus electrode; and
a final accelerating electrode.
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Abstract
An electron gun for a color cathode ray tube is formed such that parallel vertical blades are extending toward cathodes formed at both edges of each electron beam passing hole in the outgoing plate of a focus electrode. Horizontal blades extending toward the cathodes at a predetermined length are formed at the edges of the top and bottom portions of electron beam passing holes in the incoming plate of a dynamic focus electrode. Thus, the horizontal blades are inserted into the electron beam passing holes of the focus electrode, which reduces astigmatism due to deflection aberration and improves the focusing characteristics.
34 Citations
24 Claims
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1. An electron gun for a color cathode ray tube comprising:
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a triode; a focus electrode having a first plane and a second plane, the second plane including a plurality of electron beam passing holes; parallel vertical blades formed along the perimeter of the electron beam passing holes of said focus electrode extending towards said triode; a dynamic focus electrode having a first plane and a second plane, the first plane including a plurality of electron beam passing holes; parallel horizontal blades formed along the perimeter of the electron beam passing holes of the first plane of said dynamic focus electrode, said parallel horizontal blades protruding into the electron beam passing holes of the second plane of said focus electrode; and a final accelerating electrode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An electron gun for a color cathode ray tube comprising:
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a triode; a focus electrode having and a second plane, the second plane including a plurality of electron beam passing holes each having identical vertical dimensions and identical horizontal dimensions; parallel vertical blades formed along the perimeters of each electron beam passing hole of said second plane of said focus electrode extending towards said triode; a dynamic focus electrode having a first plane and a second plane, the first plane including a plurality of circular electron beam passing holes each having a diameter that is smaller than the vertical dimension of the electron beam passing holes of said focus electrode; parallel horizontal blades integrally formed along the perimeters of each electron beam passing hole of said dynamic focus electrode, said parallel horizontal blades protruding into the electron beam passing holes of the outgoing plate of said focus electrode; and a final accelerating electrode. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. An electron gun for a color cathode ray tube comprising:
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a triode; a focus electrode having a first plane and a second plane, the second plane including a plurality of electron beam passing holes; parallel vertical blades formed along the perimeters of each of the plurality of electron beam passing holes, said parallel vertical blades extending towards said triode; a dynamic focus electrode having a first plane and a second plane, the first plane including a plurality of circular electron beam passing holes; an auxiliary electrode disposed between said focusing electrode and said dynamic focusing electrode, said auxiliary having a plurality of circular electron beam passing holes which correspond in shape and dimension to the electron beam passing holes of the first plane of said dynamic focus electrode; parallel horizontal blades integrally formed along the perimeters of each of the electron beam passing holes of said auxiliary electrode, said parallel horizontal blades protruding into the electron beam passing holes of the second plane of said focus electrode; and a final accelerating electrode. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24)
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Specification