Abstract: A generally box shaped, electronic lens system for use in a cathode ray tube for amplification of both horizontal and vertical deflection of the electron beam. The lens system comprises two or three electrodes arranged in axial alignment, with an insulating gap or gaps therebetween, so as to encompass the beam trajectories from the deflection system to the target of the CRT. The action of the lens system on the beam is divergent in a horizontal direction and convergent in a vertical direction. The target side electrode has its beam exit end closed by an end plate having defined therein an aperture elongated horizontally. The CRT includes a postaccelerating electrode whose field acts on the beam exit end of the lens system, creating an additional lens at the end plate aperture. The vertical dimension of the aperture gradually increases, and then gradually decreases, from the midpoint toward the opposite extremities of its horizontal dimension.

Abstract: A generally box shaped, electronic lens system is incorporated in a cathode ray tube for amplification of both horizontal and vertical deflections of the electron beam. The lens system comprises two electrodes, one partly nested in the other with an insulating gap therebetween and both so disposed as to encompass the trajectories of the beam from the deflection system to the target of the CRT. A postaccelerating or other postdeflection electrode is provided to exert its field upon at least the target side end of the lens system. Upon application of prescribed potentials to the two lens electrodes and to the postdeflection electrode, the lens system provides a quadrupolar lens therein for deflection amplification in both directions. The lens system further coacts with the postdeflection electrode to create another electron lens adjacent its beam exit end for converging the beam in one of the orthogonal directions of beam deflection.

Abstract: A trapezoidal or rectangular box-shaped lens is incorporated, in combination with a postaccelerating electrode, in a cathode ray tube for amplification of beam deflections in both horizontal and vertical directions. Basically the lens comprises three lens elements or electrodes arranged end-to-end, with insulating gaps therebetween, so as to encompass the trajectories of the electron beam from the deflection system to the target of the CRT. For improvement of display characteristics the adjacent ends of not only the top and bottom sides, but also the right and left sides, of the electrodes of the lens system are oppositely curved to arcs that are convexed in prescribed directions. An end plate at the beam exit end of the target-side electrode has formed therein an elongate aperture extending in one of the orthogonal directions of beam deflection. The lens system provides a divergent action in one of the orthogonal directions and a doubly convergent action in the other.