Second grid for an electron gun having apertures and rotary asym

Details Second grid for an electron gun having apertures and rotary asym Second grid for an electron gun having apertures and rotary asym

1994-12-22

1998-11-24

O'Shea, Sandra L.

Electric lamp and discharge devices

Cathode ray tube

Plural beam generating or control

313414, H01J 2956, H01J 2951

Patent

active

058412247

ABSTRACT:
An electron gun for a large-sized color cathode ray tube has three cathodes heated by a heater for emitting thermoelectrons, a first grid for controlling emitted electron beams on one side of the cathodes, a second grid for attracting the thermoelectrons gathered on the cathodes on one side of the first grid, a plurality of electrodes sequentially arranged on the second grid for accelerating and focusing the incoming electron beams, and a bead glass for fixing the electrodes spaced apart by predetermined distances, in which the thickness of the second grid is varied to decrease the divergence angle of the electron beams, and horizontal slits being rotary asymmetrical portions are formed in both sides around electron beam passing holes to contrive a quadrupole effect, thereby compensating for distortion of the electron beams on the periphery of a screen caused by a deflection aberration to thus improve resolution of large-sized Brawn tubes.

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patent: 5066887 (1991-11-01), New
patent: 5198719 (1993-03-01), Koh
patent: 5412277 (1995-05-01), Chen

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