Abstract:
A laminar flow electron gun for forming an electron beam including a cathode for emitting electrons, an apertured dishshaped electrode surrounding the cathode surface and an anode spaced from said cathode and electrode and cooperating therewith to provide a substantially uniform electric field at the surface of said cathode to cause electrons to emit normally from the entire surface in a beam, said anode also forming a divergent electrostatic lens along the path of the beam and accelerating and focusing means disposed further along the path of the beam to accelerate and focus the beam at a target.
Abstract:
An electron gun for a post-acceleration picture tube comprises a first electrode to which a low voltage is applied, a second electrode to which a high voltage is applied and a third electrode to which an intermediate voltage is applied. The main lens of the electron gun is composed of the first, second and third electrodes. The electron gun is particularly useful in a post-acceleration shadow-mask type color picture tube.
Abstract:
An electron gun in which the space for electron extraction is physically separated from the space for electron acceleration. A non-emissive screen grid is located on the cathode and a second grid is located in the electron shadow of the screen grid. An anode is located beyond the second grid for accelerating the beam.
Abstract:
836,219. Travelling-wave tubes. STANDARD TELEPHONES & CABLES Ltd. Jan. 8, 1957, No. 713/57. Class 39(1). A travelling-wave tube mounting and focusing unit comprises an input and output rectangular waveguide 9, 10, Fig. 1, respectively, each apertured through their wide walls to surround respectively the input and output ends of tube 1, a focusing solenoid 15 extending between the waveguides and further solenoids 14, 16 at each end beyond the waveguides, and, at least in conjunction with the output waveguide, a pair of sheets 18, 19, Figs. 2, 3, of low reluctance magnetic material apertured to surround the tube, arranged to abut against the outside of the opposite wide waveguide walls 10 and extending beyond the width of the walls; and a pair of similarly-oriented permanent magnets 20 extending between and contacting the pair of said sheets and lying one on each narrow wall of the waveguide. The length of each magnet may be 1¢ times the wide dimension of the waveguide. The sheets 18, 19 are slotted partially at 24 to reduce transverse fields. The permanent magnets maintain a uniform field along the tube.