Apparatus for reducing deflection aberration in a CRT

Details Apparatus for reducing deflection aberration in a CRT Apparatus for reducing deflection aberration in a CRT

1995-07-06

1998-05-26

O'Shea, Sandra L.

Electric lamp and discharge devices

Cathode ray tube

Beam deflecting means

313426, 313430, H01J 2976

Patent

active

057571210

ABSTRACT:
In an in-line beam type CRT, at least one pair of quadrupole electromagnets and at least one pair of quadrupole electromagnets rotated by 45.degree. about a beam axis are provided around a neck portion of a deflection yoke. Further, electric field lenses for respectively applying quadrupole electric fields to beams are mounted to an electron gun. Thus, the CRT can provide satisfactory spot shapes over the entire surface of a screen thereof and hence achieve high resolution.

REFERENCES:
patent: 4670726 (1987-06-01), Ogata et al.
patent: 4758762 (1988-07-01), Van Gorkum et al.
patent: 4961021 (1990-10-01), Oguro et al.
patent: 5027042 (1991-06-01), Sluyterman et al.
patent: 5327051 (1994-07-01), Johnson et al.
patent: 5399933 (1995-03-01), Tsai
patent: 5465026 (1995-11-01), Roussel et al.

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