In-line electron gun for cathode ray tube having burrs and slits in the shield cup

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

• three cathodes arranged in a horizontal line to emit thermal electrons;
• a plurality of grid electrodes sequentially placed along a common axis transversing the horizontal line to focus and accelerate the thermal electrons into beam shapes, each of the grid electrodes having red, green and blue beam-guide holes, said grid electrodes comprising an outermost grid electrode spaced away from the three cathodes along the common axis;
• and
• a shield cup attached to the outermost grid electrode, the shield cup including a bottom having red, green and blue-beam guide holes having predetermined diameters and arranged in a row, and a side wall extending from a circumference of the bottom and having a substantially cylindrical shape, the shield cup comprising an induced electromotive force decreasing unit for decreasing the electromotive force near the green beam-guide hole,
• wherein the induced electromotive force decreasing unit comprises two opposing slits formed in the side wall and centered around the green beam-guide hole of the shield cup, each of the slits having a width less than or equal to the distance between the red and blue beam-guide holes and a predetermined depth.

A cathode ray tube, comprising:

• a panel having a phosphor screen;
• a funnel sealed to the panel;
• and
• a neck connected to the funnel, said neck having an in-line electron gun comprising,
• three cathodes arranged in a horizontal line to emit thermal electrons,
• a plurality of grid electrodes sequentially placed along a common axis transversing the horizontal line to focus and accelerate the thermal electrons into beam shapes, each of the grid electrodes having red, green and blue beam-guide holes, said grid electrodes comprising an outermost grid electrode spaced away from the three cathodes along the common axis, and
• a shield cup attached to the outermost grid electrode, the shield cup including a bottom having red, green and blue-beam guide holes having predetermined diameters and arranged in a row, and a side wall extending from a circumference of the bottom and having a substantially cylindrical shape, the shield cup comprising an induced electromotive force decreasing unit for decreasing the electromotive force near the green beam-guide hole,
• wherein the induced electromotive force decreasing unit comprises two opposing slits formed in the side wall and centered around the green-beam-guide hole of the shield cup, each of the slits having a width which is less than or equal to the distance between the red and blue beam-guide holes and a predetermined depth.