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US 5,180,945 AGranted
Electron gun for cathode ray tube
AssigneeSamsung Electron Devices Co., Ltd.
InventorYong-geol Kweon
Life of this patent
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Abstract
An electron gun for a cathode ray tube comprises a triode having a control electrode and a screen electrode. Each electrode has a number of beam passing holes. The diameter of the beam passing holes of the control electrode is greater than the diameter of the beam passing holes of the screen electrode. Accordingly, spherical aberrations of cathode and prefocusing lenses are decreased, thereby improving image resolution.
Claims3
An electron gun for a cathode ray tube, comprising:
- a cathode for generating thermoelectrons;
- `a sequentially arranged control electrode and screen electrode each having three in-line type electron beam passing holes, for transforming the thermoelectrons emitted from said cathode into an electron beam;
- and
- a focus electrode and an anode for initially focusing and accelerating said generated electron beam, wherein a diameter of the electron beam passing holes of said control electrode, said screen electrode and an incident side of said focus electrode are 0.7 mm, 0.6 mm and 1.53 mm, respectively, while a diameter of the electron beam passing holes of an outgoing side of said focus electrode and a diameter of the electron beam passing holes of said anode are about 4.1 mm.
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An electron gun for a cathode ray tube, comprising:
- a cathode for generating thermoelectrons;
- `a sequentially arranged control electrode and screen electrode, said control electrode having a plurality of in-line type electron beam passing holes of a preselected diameter and said screen electrode having a plurality of in-line type electron beam passing holes of a preselected diameter, said control electrode and said screen electrode transforming the thermoelectrons emitted from said cathode into an electron beam;
- and
- a focus electrode having a first surface with a plurality of in-line type electron beam passing holes of a first diameter and a second surface with a plurality of in-line type electron beam passing holes of a second diameter, the diameter of the beam passing holes of said screen electrode and the diameter of the beam passing holes of the first surface of said focus electrode having a ratio of 60:153.
1 more element
Dependencies are inferred from the claim text.