Cathode ray tube with reduced astigmatism and curvature of field

Details Cathode ray tube with reduced astigmatism and curvature of field Cathode ray tube with reduced astigmatism and curvature of field

1998-01-23

1999-12-14

Day, Michael

Electric lamp and discharge devices

Cathode ray tube

Plural beam generating or control

315382, H01J 2946

Patent

active

060022019

ABSTRACT:
An electron gun for a cathode ray tube includes an accelerating electrode to be supplied with a maximum voltage, a focus disposed adjacent to and spaced from the accelerating electrode, and a focus-corrective electrode adjacent to and spaced from the focus electrode. The accelerating electrode and the focus electrode form a first electron lens for focusing the electron beams stronger in a direction parallel to an in-line direction of the electron beams than in a direction perpendicular to the in-line direction, and the focus-corrective electrode is configured so as to form a quadrupole lens by application thereto of a voltage which is lower than a voltage applied to the focus electrode in cooperation with the focus electrode for elongating a cross-section of the electron beams horizontally, and is adapted to be supplied with a voltage which increases with increasing deflection of the electron beams and which is lower than the voltage applied to the focus electrode.

REFERENCES:
patent: 4731563 (1988-03-01), Bloom et al.
patent: 4886999 (1989-12-01), Yamane et al.
patent: 4887009 (1989-12-01), Bloom et al.
patent: 5170101 (1992-12-01), Gorski et al.
patent: 5461278 (1995-10-01), Migono et al.
patent: 5610481 (1997-03-01), Shirai et al.
patent: 5734235 (1998-03-01), Noguchi

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