Electron guns for color picture tube with electrostatic focusing lenses for operating in vertical and horizontal directions

Electron guns for a color picture tube comprising three electron beam sources for emitting in parallel electron beams to a phosphor screen of the color picture tube, and main lenses for focusing the electron beams on the phosphor screen, wherein the improvement comprises:

• main electrostatic focusing lens including a first accelerating/focusing electrode and a second accelerating/focusing electrode which protrude and recede around beam passing openings, whereby said first accelerating/focusing electrode and said second acceleratinq/focusing electrode carry out a vertical focusing action and a horizontal focusing action at different positions;
• wherein
• said first accelerating/focusing electrode is provided with a plurality of regularly spaced projections on one surface thereof, said projections being arranged in a horizontal in-line direction and each having a width smaller than of each beam passing opening of the first accelerating/focusing electrode and protruding at its center but flattening at its top and bottom portions;
• and
• said second accelerating/focusing electrode is provided with a plurality of partitions on one surface thereof between beam passing openings, each of said partitions protruding from the one surface in a direction perpendicular to the horizontal in-line direction and having a width smaller than that of each of said beam passing openings of the second accelerating/focusing electrode.

Electron guns for a color picture tube comprising three electron beam sources for emitting in parallel electron beams to a phosphor screen of the color picture tube, and main lenses for focusing the electron beams on the phosphor screen, wherein the improvement comprises:

• main electrostatic focusing lens including a first accelerating/focusing electrode and a second accelerating/focusing electrode, said first accelerating/focusing electrode and said second accelerating/focusing electrode carrying out a vertical focusing action and a horizontal focusing action at different positions, wherein
• said first accelerating/focusing electrode is provided with a plurality of regularly spaced projections on one surface thereof, said projections being arranged in a horizontal in-line direction and each having a width smaller than that of each beam passing opening of the first accelerating/focusing electrode and protruding at its center but flattening at its top and bottom portions;
• and
• said second accelerating/focusing electrode is provided with a plurality of regularly spaced receiving recesses on one surface thereof, said recesses being arranged in the horizontal in-line direction and each having a width smaller than that of each beam passing opening of the second accelerating/focusing electrode and being depressed at its center but flattening at its top and bottom portions.

Electron guns for a color picture tube comprising three electron beam sources for emitting in parallel electron beams to a phosphor screen of the color picture tube, and main lenses for focusing the electron beams on the phosphor screen, wherein the improvement comprises:

• main electrostatic focusing lens including a first accelerating/focusing electrode and a second accelerating/focusing electrode, said first accelerating/focusing electrode and said second accelerating/focusing electrode carrying out a vertical focusing action and a horizontal focusing action at different positions, wherein
• said first accelerating/focusing electrode is provided with a plurality of regularly spaced projections on one surface thereof, said projections being arranged in a horizontal in-line direction and each having a width smaller than that of each beam passing opening of the first accelerating/focusing electrode and protruding at its center but flattening at its top and bottom portions;
• and
• said second accelerating/focusing electrode is provided with a plurality of partitions on one surface thereof between beam passing openings, each of said partitions protruding from the one surface in a direction perpendicular to the horizontal in-line direction and having a width smaller than that of each of said beam passing openings of the second accelerating/focusing electrode.