In-line type electron gun in cathode ray tube

An in-line type electron gun in a color cathode ray tube, comprising:

• a pre-focusing lens part having at least two electrodes for focusing electron beams;
• a main lens part having two or more electrodes for focusing the electron beams onto a screen;
• and
• at least one electrostatic field controlling electrode in the electrodes of the main lens part having a center electron beam pass through hole and two outer electron beam pass through holes, wherein each of the outer electron beam pass through holes has the form of a circular hole and a rectangular hole combined, wherein the rectangular hole has a height substantially the same as a diameter of the circular hole, and a width smaller than a radius of the circular hole.

An in-line type electron gun in a color cathode ray tube, comprising:

• a pre-focusing lens part having at least two electrodes for focusing electron beams;
• a main lens part having two or more electrodes for focusing the electron beams onto a screen;
• and
• at least one electrostatic field controlling electrode in the electrodes of the main lens part having a center electron beam pass through hole and two outer electron beam pass through holes, wherein each of the outer beam pass through holes has the form of a rectangular hole combined with a semi-elliptical hole portion of an elliptical hole located opposite to the center beam pass through hole with reference to a center of the elliptical hole, and wherein the rectangular hole has a height substantially the same as a vertical diameter of the elliptical hole, and a width smaller than a half of a horizontal diameter of the elliptical hole.

An in-line type electron gun in a color cathode ray tube, comprising:

• a pre-focusing lens part having at least two electrodes for focusing electron beams;
• a main lens part having two or more electrodes for focusing the electron beams onto a screen;
• and
• at least one electrostatic field controlling electrode in the electrodes of the main lens part having a center electron beam pass through hole and two outer electron beam pass through holes, wherein each of the outer beam pass through holes has the form of a rectangular hole combined with a semi-elliptical hole portion of an elliptical hole located opposite to the center beam pass through hole with reference to a center of the elliptical hole, and wherein the center electron beam pass through hole is circular.

An in-line type electron gun in a color cathode ray tube, comprising:

• a pre-focusing lens part having at least two electrodes for focusing electron beams;
• a main lens part having two or more electrodes for focusing the electron beams onto a screen;
• and
• at least one electrostatic field controlling electrode in the electrodes of the main lens part having a center electron beam pass through hole and two outer electron beam pass through holes, wherein each of the outer beam pass through holes has the form of a rectangular hole combined with a semi-elliptical hole portion of an elliptical hole located opposite to the center beam pass through hole with reference to a center of the elliptical hole, and wherein the center electron beam pass through hole is elliptical.

An in-line type electron gun in a color cathode ray tube, comprising:

• a pre-focusing lens part having at least two electrodes for focusing electron beams;
• a main lens part having two or more electrodes for focusing the electron beams onto a screen;
• and
• at least one electrostatic field controlling electrode in the electrodes of the main lens part having a center electron beam pass through hole and two outer electron beam pass through holes, wherein each of the outer electron beam pass through holes has a form of a circular hole and a rectangular hole combined therein, the rectangular hole having a height ‘V2’ greater than a vertical diameter ‘V1’ of the center beam pass through hole of the electrostatic field controlling electrode, wherein the electrostatic field controlling electrode has a substantially constant thickness.