Electron gun for color cathode-ray tube

Details Electron gun for color cathode-ray tube Electron gun for color cathode-ray tube

1993-06-24

1996-01-30

O'Shea, Sandra L.

Electric lamp and discharge devices

Cathode ray tube

Plural beam generating or control

313414, 313441, H01J 2951

Patent

active

054882648

ABSTRACT:
An electron gun for a color CRT has three cathodes disposed in parallel to each other, first to fifth grid electrodes and a convergence deflector. The electron gun is additionally provided with a tetrode magnetic field generator including a pair of permanent magnets having an astigmatic effect of the central beam of the electron gun on the cathode side of the convergence deflector. An astigmatism eliminator is provided to cancel astigmatic aberration of the side beams of the electron gun near the position where the electron beams are converged. The astigmatism eliminator is composed of a fifth grid electrode whose entrance has an electron beam passing hole of nearly elliptic shape.

REFERENCES:
patent: 4583024 (1986-04-01), Chen
patent: 4614894 (1986-09-01), Izumida
patent: 4853601 (1989-08-01), Odenthal
patent: 4900979 (1990-02-01), Shimona et al.

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