U.S. Philips Corporation

Henricus Wilhelmus Linssen

Jan Bijma

By making the first grid of an electron gun for a cathode-ray tube to extend in the manner of a funnel in such manner that on the side of the second grid the aperture is elongate and mainly a quadrupole lens action is obtained, it is possible to obtain in the corners and at the edge of the display screen a spot which is surrounded by considerably less haze than the known construction having an elongate aperture in the first grid.

Cathode-ray tube

A cathode ray tube having three electron guns in one plane which are deflected by a self-converging deflection coil. In order to obtain circular electron spots, the tube includes an astigmatic electron lens which restricts the dimension of the electron spots perpendicular to this one plane.

Growing community of inventors

Eindhoven, Netherlands

Henricus Wilhelmus Linssen