Electrode structure of an electron gun for a cathode ray tube

Details Electrode structure of an electron gun for a cathode ray tube Electrode structure of an electron gun for a cathode ray tube

1993-07-22

1995-10-03

O'Shea, Sandra L.

Electric lamp and discharge devices

Cathode ray tube

Plural beam generating or control

313412, 313449, 313460, 31536815, H01J 2962

Patent

active

054554810

ABSTRACT:
An electrode structure of an electron gun for a cathode ray tube has a plurality of cathodes for emitting thermions, grid electrodes to form an electron beam of thermions, a first acceleration and focus electrode, a second acceleration and focus electrode and a dipole lens system which forms a circular beam spot on a screen of the cathode ray tube by removing the horizontal lengthening of the beam spot due to an increase in the amount of deflection of the beam in the peripheral portion of the screen of the cathode ray tube. The dipole lens system has a first electrode and a second electrode to which a dynamic voltage of a predetermined range is applied. The first electrode of the dipole lens system has opening portions which pierce the upper and lower sides of the first accelerator and focus electrode. The second electrode of the dipole lens system has horizontal plates which cover the opening portions with a predetermined gap. By applying a dynamic voltage to the second accelerator and focus electrode in the peripheral portion of the screen of the cathode ray tube, the focal distance of the main focus lens between an anode electrode and the second accelerator and focus electrode is increased, thereby removing the halo portion of the beam spot.

REFERENCES:
patent: 4697120 (1987-09-01), Alig et al.
patent: 4772826 (1988-09-01), Bloom et al.
patent: 4772827 (1988-09-01), Kuniharu

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