Patent ID: 6750601
Filing Date: 2004-06-15
Classification: H01J

Abstract:
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: (gÃ—100)/L=5-30(%) â€ƒwhere L is a sum of lengths of the focus electrodes and g is a sum of lengths of intervals of the focus electrodes.