Patent ID: 6861793

Claim:
A color picture tube device that deflects a plurality of electron beams and produces a color image on a phosphor screen, comprising: an electron gun having a plurality of in-line cathodes, and emitting the plurality of electron beams; a deflection yoke including a horizontal deflection coil, a vertical deflection coil, and a core, the horizontal deflection coil generating a horizontal deflection magnetic field that is substantially uniform, and the vertical deflection coil generating a vertical deflection magnetic field; and a lens forming unit forming a lens which the plurality of electron beams pass through, the lens being positioned between an end of the core facing the electron gun and the phosphor screen, wherein the plurality of electron beams are substantially parallel with a tube axis of the color picture tube device, when passing the end of the core facing the electron gun, and the lens has (a) a horizontal converging effect of causing the plurality of electron beams to approach each other in a horizontal direction regardless of which part of the phosphor screen the plurality of electron beams reach, and (b) an intensity distribution such that the horizontal converging effect becomes weaker as the part of the phosphor screen which the plurality of electron beams reach is more distant in the horizontal direction from a vertical center line of the phosphor screen.