Abstract: A vertical deflection system for a CRT is disclosed which has a pair of traveling wave deflectors disposed opposite each other across a path of beam from gun to target. Each deflector has a helical conductor in the for of a strip of sheet metal coiled around an elongate core of insulating material. For the provision of a CRT capable of handling a wide band of frequencies, the dispersion characteristic of each traveling wave conductor is optimized through adjustment of the specific dielectric constant of the insulating core. Preferred values of the specific dielectric constant are specified in relation to the characteristic impedance of the traveling wave conductor.

Abstract: A projection lens assembly (10) projects onto a display screen (38) electrons emitted from an output side (86) of an electron multiplier such as, for example, a microchannel plate (70). The projection lens assembly includes a dome-shaped mesh element (16) that is concave as viewed from the display screen. The mesh element is positioned between the microchannel plate and a filter element (20) having a beam-limiting aperture (22). The mesh element is of an aspherical shape that allows the projection lens assembly to project the electrons toward the display screen with substantially no spherical aberration, thereby forming near the beam-limiting aperture an electron beam crossover of small diameter. The beam-limiting aperture is formed with a relatively small diameter that allows the filter element to block electrons of energies outside a preselected range of energy values, thereby reducing chromatic aberration in the image formed on the display screen.

Abstract: A charged-particle beam tube having an envelope of a dielectric material and a pattern yoke formed on the inner surface of the envelope. The pattern yoke has a pair of horizonal deflection electrodes and a pair of vertical deflection electrodes arranged alternately. The horizontal deflection electrodes have a greater circumferential width than the vertical deflection electrodes. The horizontal and vertical deflection electrodes are supplied with different bias voltages.

Abstract: A traveling-wave deflection system comprising a pair of deflectors disposed opposite each other across the path of an electron beam from an electron gun to a screen in a cathode-ray tube. Each deflector has a helical conductor wound around a core structure generally extending along the beam path. If made solely of an insulating material as in the prior art, the core structures would be electrified in use of the CRT, with the consequent deflection defocusing and bright line displacement. Therefore, in order to avoid electrification, the core structures are each enveloped in an antielectrification layer of a conducting material having a higher resistivity than the helical conductor. An embodiment is also disclosed wherein the core structures are wholly of conductive material.

Abstract: In an electromagnetic focusing electrostatic type image pick-up tube the electrostatic deflecting electrodes formed on the inner surface of the tube consist of 2 pairs of electrodes. Each of these electrostatic deflecting electrodes has a zig-zag shape from the electron gun towards the target. This zig-zag shape is twisted in the circumferential direction around the axis of the tube and variation rates of this twist amount are different, depending on the position in the axial direction.

Abstract: An electron beam deflection structure (10) of the traveling wave type effectively cancels the longitudinal voltage gradients and the associated electron beam defocusing that are characteristic of such deflection structures. The deflection structure comprises a first helical coil member (48) and a second helical coil member (50) that are coaxial with the longitudinal axis (26) of the tube. Each of the coil members has wide and narrow segments which alternate along the length of the coil in sequence with the turns of the coil. The first coil member has its wide segments (92a) positioned on the bottom and its narrow segment (92b) on top of the coil member. The second coil member has its wide segments (94a) positioned on top and its narrow segments (94b) positioned on the bottom of the coil member. The narrow segments from one of the coil members are interleaved with the wide segments from the other coil member.

Abstract: An improved vertical and horizontal deflection electrode system for an electrostatic deflection cathode ray tube which comprises a glass bulb and an electron beam source and vertical and horizontal deflection electrodes formed in patterns and which are applied to the inner surface of the glass bulb and wherein the ratio of the area of the vertical deflection electrodes to the area of the horizontal deflection electrodes is selected to be approximately equal to the deflection aspect ratio of the electron beam and the horizontal and vertical directions which results in the voltage required in the deflection system being substantially decreased.

Abstract: A cathode ray tube comprises an envelope, an electron beam source positioned at one end of the envelope, a target positioned at another end of the envelope, a mesh electrode positioned opposite to the target, and an electrostatic lens means positioned between the electron beam source and the mesh electrode. The lens means has a high-tension electrode and a low-tension electrode positioned along the electron beam path to focus the electron beam. The low-tension electrode is divided into four arrow or zig-zag patterns to deflect the electron beam. The length l between the electron beam source and the mesh electrode and the length x of the high-tension electrode are selected to optimize the magnification, aberration and landing error of the electrostatic lens means.

Abstract: A cylindrical electrode for use in focusing and deflecting an electron beam is provided about its central section with eight mutually separated electrode segments arranged in a diametrical fashion for deflecting the beam, and with first and second cylindrical electrode sections at opposite ends of the electrode for focusing the electron beam.