Electron gun for a cathode ray tube
First Claim
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1. An electron gun for a cathode ray tube comprising:
- a triode having first, second, and third cathodes for emitting thermal electrons;
a control electrode and a screen electrode for transforming the emitted thermal electrons into electron beams; and
a main lens system for focusing and accelerating the electron beams, said main lens system having a static focus electrode including first, second, and third vertically-elongated beam passing holes arranged in that order along a straight line in a beam outgoing plane of said static focus electrode, said static focus electrode being supplied with a static focus voltage, a dynamic focus electrode including first, second, and third horizontally-elongated electron beam passing holes arranged in order along a straight line in a beam incoming plane of said dynamic focus electrode, the beam incoming plane of said dynamic focus electrode opposing said beam outgoing plane of said static focus electrode, said dynamic focus electrode being supplied with a dynamic focus voltage, and an anode supplied with an accelerating voltage which is greater than the dynamic focus voltage and static focus voltage wherein a spacing between centers of the first and second electron beam passing holes in the beam incoming plane of said dynamic focus electrode is shorter than a spacing between centers of the first and second electron beam passing holes in the beam outgoing plane of said static focus electrode.
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Abstract
An electron gun for a cathode ray tube is formed such that the spacing between the electron beam passing holes in a static focus electrode is longer than that between the electron beam passing holes in a dynamic focus electrode which forms a dynamic quadrupole lens with the static focus electrode, thereby enhancing the focusing and convergence characteristics of electron beams.
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2 Claims
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1. An electron gun for a cathode ray tube comprising:
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a triode having first, second, and third cathodes for emitting thermal electrons; a control electrode and a screen electrode for transforming the emitted thermal electrons into electron beams; and a main lens system for focusing and accelerating the electron beams, said main lens system having a static focus electrode including first, second, and third vertically-elongated beam passing holes arranged in that order along a straight line in a beam outgoing plane of said static focus electrode, said static focus electrode being supplied with a static focus voltage, a dynamic focus electrode including first, second, and third horizontally-elongated electron beam passing holes arranged in order along a straight line in a beam incoming plane of said dynamic focus electrode, the beam incoming plane of said dynamic focus electrode opposing said beam outgoing plane of said static focus electrode, said dynamic focus electrode being supplied with a dynamic focus voltage, and an anode supplied with an accelerating voltage which is greater than the dynamic focus voltage and static focus voltage wherein a spacing between centers of the first and second electron beam passing holes in the beam incoming plane of said dynamic focus electrode is shorter than a spacing between centers of the first and second electron beam passing holes in the beam outgoing plane of said static focus electrode. - View Dependent Claims (2)
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Specification