KR940022655A - Electron gun for colored cathode ray tube - Google Patents

Abstract

The present invention discloses an electron gun for a color cathode ray tube. According to the present invention, the final acceleration is performed to be adjacent to the cathode, the control electrode, the screen electrode, and the first, the second, the third, the fourth, and the fifth focus electrodes forming the auxiliary electron lens and the fifth focus electrode. A dynamic focus voltage having an electrode, a constant voltage is applied to the second focus electrode, a focus voltage higher than the constant voltage is applied to the 1,4 focus electrodes, and a dynamic focus voltage modulated in synchronization with a deflection signal to the third and fifth focus electrodes. This has the characteristic of being applied, which has the advantage of being able to obtain a uniform cross section of the electron beam in the entire fluorescent film, thereby improving the resolution of the image.

Description

Electron gun for colored cathode ray tube

Since this is an open matter, no full text was included.

1 is a cross-sectional view of a conventional electron gun for color cathode ray tubes,

3 is a cross-sectional view of an electron gun for a color cathode ray tube according to the present invention,

4 (a) (b) is a diagram showing the orbits of the electron lens and the electron beam formed by the electron gun of FIG.

Claims (7)

A cathode, a control electrode, a screen electrode, and a first, second, third, fourth, fifth focus electrode, and a fifth focus electrode, which form an auxiliary electron lens, and a final accelerating electrode, which is formed adjacent to the main lens. A constant voltage VS is applied to the second focus electrode 15, and a focus voltage VF higher than the constant voltage VS is applied to the first and fourth focus electrodes 14 and 17. And 5 focus electrodes (16) (18), wherein a dynamic focus voltage (VD) is applied to modulate in synchronization with the deflection time signal. The elongated electron beam through hole 16H is formed in the emission side surface 16a of the third focus electrode 16, and the transverse side shape is formed in the incident side surface 17a of the fourth focus electrode 17. Electron beam through hole (17H) of the color cathode ray tube electron gun, characterized in that to form a first quadrupole lens. The elongated electron beam through hole 17H 'is formed in the emission side surface 17a of the fourth focus electrode 17, and is transverse to the incident side surface 18a of the fifth focus electrode 18. An electron gun for a color cathode ray tube, characterized in that a long electron beam through hole (18H) is formed to form a second quadrupole lens. The method of claim 1, wherein a voltage of 400 to 800 V is applied to the total positive voltage VS, a voltage of 6 to 10 Kv is applied to the focus electrode VF, and the dynamic focus voltage VD is applied to the focus voltage VF. Electron gun for color cathode ray tube, characterized in that a voltage of 4 to 11KV is applied. The electron gun for a color cathode ray tube according to claim 1, wherein a focus voltage VF is applied higher than the dynamic focus voltage VD when the electron beam emitted from the electron gun is emitted to the center portion of the fluorescent film. The electron gun for color cathode ray tubes according to claim 1, wherein the dynamic focus voltage VD is applied higher than the focus voltage VF when scanned to the periphery of the fluorescent film of the electron beam emitted from the electron gun. The electron gun for a color cathode ray tube according to claim 1, wherein a voltage applied to said second focus electrode (15) is applied to said screen electrode and a coin. ※ Note: The disclosure is based on the initial application.