Cathode-ray tube device

Details Cathode-ray tube device Cathode-ray tube device

H - Electricity

01

J

313/35.351

H01J 29/70 (2006.01) H01J 29/50 (2006.01) H01J 29/56 (2006.01)

Patent

CA 1177872

TITLE OF THE INVENTION: Cathode-Ray Tube Device ABSTRACT OF THE DISCLOSURE: An auxiliary grid which is formed with one or more elongated slits through which pass electron beams is disposed in a prefocusing system in a cathode-ray tube, and a dynamic voltage which varies in level with increase in horizontal deflection angle is applied to the auxiliary grid so that axial asymmetry of the prefocusing system can be increased with increase in the horizontal deflection angle. As a consequence, the beam spot can be maintained substantially in the form of a true circle not only at the center of the screen but also at the portions adjacent to the peripheries thereof. Thus, the resolution at the portions adjacent to the peripheries of the screen can be improved and consequently high-quality images can be represented over the whole surface of the screen. - 1 -

385598

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