Color cathode ray tube apparatus

Details Color cathode ray tube apparatus Color cathode ray tube apparatus

1996-12-02

1997-12-02

Patel, Ashok

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Plural concentrating, accelerating, and/or de-accelerating...

315 17, 3153821, 313412, 313414, 313432, 313439, H01J 2946

Patent

active

056940041

ABSTRACT:
In a color cathode ray tube apparatus, a main electron lens unit for converging three in-line electron beams on a phosphor screen is formed of a plurality of electrodes, including at least first, second, and third electrodes, which are arranged from the cathode side toward the phosphor screen. An asymmetric electron lens, which horizontally diverges and vertically converges the electron beams, is formed on the cathode side in a lens effect region of a first electron lens composed of the second and third electrodes, and an asymmetric second electron lens, which has one effect with respect to the horizontal direction of the electron beams and another with respect to the vertical direction, is formed between the first and second electrodes, at the least. In this arrangement, the effects of the second lens to converge and diverge the electron beams in the horizontal and vertical directions, respectively, are enhanced, and the effects of the first electron lens are attenuated, depending on the deflection of the electron beams by means of a deflection yoke. Thus, the horizontal and vertical diameters of beam spots at the peripheral portion of a picture can be reduced.

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