초록 ▼

A three-beam unitized, in-line electron gun for a color cathode ray tube has a series of hollow, rectangulr-in-cross-section electrodes for the side-by-side accommodation of the three beams. A two-element anode electrode for the gun includes first and second cup-shaped elements each having an apertu

A three-beam unitized, in-line electron gun for a color cathode ray tube has a series of hollow, rectangulr-in-cross-section electrodes for the side-by-side accommodation of the three beams. A two-element anode electrode for the gun includes first and second cup-shaped elements each having an apertured electrode face. The second cup-shaped element is nested in the first element, and has a cup draw effective to provide a predetermined distance between the electrode faces when the cups are in nested relationship. The critical focusing and convergence of the gun can thereby be adjusted by the adjustment of the cup draw.

대표청구항 ▼

For use in a color cathode ray tube having a three-beam unitized, in-line electron gun, said gun having a series of hollow, rectangular-in-cross-section electrodes for the side-by-side accommodation of the three beams, a two-element anode electrode coupled to an anode voltage for said gun, comprisin

For use in a color cathode ray tube having a three-beam unitized, in-line electron gun, said gun having a series of hollow, rectangular-in-cross-section electrodes for the side-by-side accommodation of the three beams, a two-element anode electrode coupled to an anode voltage for said gun, comprising: a first cup-shaped element having an electrode face with a single, horizontally elongated aperture for receiving said three beams, said horizontally elongated aperture element having general shape of a dog bone, with two outer beams passing through expanded ends of said horizontally elongated aperture, and center beam passing through narrower, central area of said horizontally elongated aperture; and a second cup-shaped element having an apertured electrode face with three circular apertures therein, and having flange means extending outwardly from its open end for attachment to rear face of a convergence cup, said second cup-shaped element nested into said first cup-shaped element and having a cup draw effective to provide a predetermined distance between the faces of said first cup-shaped element and said second cup-shaped element when in nested relationship, whereby critical focusing and convergence of said gun can be adjusted by adjustment of said cup draw.