Multiple beam electron discharge tube having bipotential acceler

Details Multiple beam electron discharge tube having bipotential acceler Multiple beam electron discharge tube having bipotential acceler

1987-11-02

1989-08-01

Tarcza, Thomas H.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

315 14, 313412, 313414, H01J 2970, H01J 2946, H01J 2950

Patent

active

048536016

ABSTRACT:
A multiple beam cathode-ray tube employs a bipotential electrode structure to provide acceleration and convergence of the electron beams without the use of a resistive helix coil. In a preferred embodiment, the bipotential electrode structure (10) is employed in a cathode-ray tube (14) in which a cathode (28) and a grid electrode structure (30) cooperate to form plural beams of high velocity electrons. The bipotential electrode structure includes an immersion lens cylinder (16) that is positioned upstream of a tubular electrode element (18). The outer diameter (226) of the immersion lens cylinder is less than the inner diameter (228) of the tubular electrode element, thereby allowing the downstream end of the immersion lens cylinder to extend into the upstream end of the tubular electrode element. A potential difference applied between the immersion lens cylinder and the tubular electrode element accelerates the electrons in the multiple beams and converges them to form an array of crossovers at a plane (64). Magnetic focus coils (54) image the array of crossovers on a display surface (36). Magnetic deflection coils ( 44) scan the electron beams in a raster pattern across the display surface to form a video display image thereon.

REFERENCES:
patent: 3327160 (1967-06-01), Schlesinger
patent: 3375390 (1968-03-01), Schlesinger
patent: 3798478 (1974-03-01), Say
patent: 4271374 (1981-06-01), Kimura
patent: 4338541 (1982-07-01), Beck
patent: 4353061 (1982-10-01), Beck
patent: 4388619 (1983-06-01), Beck
patent: 4543508 (1985-09-01), Saito

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