Electric lamp and discharge devices – Cathode ray tube – Plural beam generating or control
Patent
1984-07-30
1986-12-02
DeMeo, Palmer C.
Electric lamp and discharge devices
Cathode ray tube
Plural beam generating or control
313449, H01J 2962
Patent
active
046267387
ABSTRACT:
A color display tube comprising an evacuated envelope (1) composed of a neck (4), a cone (3) and a display window (2), contains in the neck a system of electron guns (5) with which three electron beams are generated. The beams are situated with their axes in one plane and are focused by means of a focusing lens field on a display screen (10) provided on the inside of the display window. The focusing lens field is formed between two electrodes (25, 26) of the electron gun system which are situated behind each other along the axes. The electrodes comprise facing outermost rims (32, 33) and includes respective apertures (38, 39, 40), (42, 43, 44) which are symmetrical with respect to the plane and through which the electron beams pass within the rims. The apertures are formed in recessed parts (34, 41) extending substantially at right angles to the axes. By making the shape of at least one of the central apertures (39, 43) so that, in addition to providing a quadrupole component, it substantially compensates an eight-pole component in the focusing lens field at the area of the central electron beam, and by making the shape of the outermost apertures in at least one of the electrodes so that, in addition to providing a quadrupole component, they substantially compensate a six-pole component in the focusing lens field at the area of the outermost electron beams, a better spot on the display screen is obtained.
REFERENCES:
patent: 4370592 (1983-01-01), Hughes et al.
patent: 4535266 (1985-08-01), Say
DeMeo Palmer C.
Kraus Robert J.
U.S. Philips Corporation
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