US 5,495,139 A · Color cathode ray tube apparatus

Abstract

In a color cathode ray tube apparatus wherein three in-line electron beams are deflected by horizontal and vertical deflection magnetic fields of a deflector. The three in-line electron beams are arranged along an axis that is inclined with respect to a horizontal axis perpendicular to the tube axis and are emitted from an electron beam producing unit. Of the three electron beams, the center beam is focused at a higher degree than the pair of side beams by an electric field lens forming unit. The pair of side beams are deflected by a deflecting unit in the direction of arrangement of the three electron beams away from the center beam and are made incident on a focusing magnetic field generating device constituting a common magnetic field focusing type electron lens for focusing and converging the three electron beams. Then, the three electron beams are directed to a phosphor screen. Accordingly, the electron beams are desirably focused and converged on the phosphor screen with a small beam spot size.

Claims8

Dependent claims

A color cathode ray tube apparatus having a tube axis and a horizontal axis perpendicular to the tube axis, comprising:

an electron beam producing unit for producing three in-line electron beams including a center beam and a pair of side beams, said three in-line electron beams being arranged on a first axis that is inclined with respect to said horizontal axis;
electron lens forming means for focusing said center beam at a higher degree than said pair of side beams and for deflecting said pair of side beams outwardly with respect to said tube axis;
focusing magnetic field generating means defining a magnetic field focusing type electron lens which is common to said three in-line electron beams and generates a focusing/converging magnetic field to focus and converge said three in-line electron beams;
and
deflecting means for generating a horizontal deflection magnetic field for deflecting said three in-line electron beams horizontally and for generating a vertical deflection magnetic field for deflecting said three in-line electron beams vertically.

2 more elements

Dependencies are inferred from the claim text.

Color cathode ray tube apparatus

Life of this patent

Color cathode ray tube apparatus

Life of this patent

Abstract

Claims8