Cathode-ray tube with convergence yoke lens systems

Details Cathode-ray tube with convergence yoke lens systems Cathode-ray tube with convergence yoke lens systems

1992-11-12

1994-11-22

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

313414, H01J 2946, H01J 2956, H01J 2951

Patent

active

053672305

ABSTRACT:
A cathode-ray tube has an electron gun disposed in its neck in confronting relationship to a phosphor screen through a deflection yoke mounted on the funnel. The electron gun has a cathode assembly for emitting three electron beams, and a main lens for passing the electron beams therethrough. The main lens includes a quadruple lens system responsive to focusing voltages for canceling an astigmatic effect produced on the electron beams when the electron beams are deflected by the deflection yoke, at a peripheral edge of the phosphor screen. The cathode-ray tube also has a first quadruple convergence yoke lens system disposed between the main lens and the deflection yoke for generating an astigmatic effect which is opposite to the deflection-induced astigmatic effect, and a second quadruple convergence yoke lens system disposed between the emitting means and the main lens means for generating an astigmatic effect which is in the same direction as the astigmatic effect generated by the first quadruple convergence yoke lens system.

REFERENCES:
patent: 4877998 (1989-10-01), Maninger et al.
patent: 5025189 (1991-06-01), Son
patent: 5061881 (1991-10-01), Suzuki et al.

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