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US 6,750,601 B2Granted
Electron gun for color cathode ray tube
AssigneeLG. Philips Displays Korea Co., Ltd.
InventorYoun Jin Kim
Life of this patent
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Abstract
An electron gun for a color cathode ray tube efficiently modulates magnetic field of a velocity modulation coil. The electron gun contains at least two focus electrodes receiving a fixed focus voltage, and the focus electrodes are arranged in a row in the electron gun. When a sum of lengths of the focus electrodes is ‘L’ and a sum of intervals of the electrodes is ‘g’, the relationship (g×100)/L=5-30(%) is satisfied.
Claims4
A cathode ray tube, which comprises:
- a fluorescent screen;
- a cathode for emitting an electron beam to the fluorescent screen;
- an electron gun having an anode electrode on a screen side and at least two focus electrodes receiving a fixed focus voltage on a cathode side;
- and
- a velocity modulation coil using a position of the focus electrode as a center of a magnetic field, the velocity modulation coil being positioned on a neck unit of the cathode ray tube, and the velocity modulation coil being synchronized with an image signal of a circuit,
- wherein the electron gun satisfies the relationship:
- (g×100)/L=5-30(%)
- where L is a sum of lengths of the focus electrodes and g is a sum of lengths of intervals of the focus electrodes.
5 more elements
Dependencies are inferred from the claim text.