Abstract: A structure in which first to third diodes cause signal beams which are produced by modulating image signals to be incident upon corresponding first to third light deflection scanning sections. The first to third light deflection scanning sections perform line scanning operations using the incident light signal beams. First to third light amplifiers amplify the light signal beams used for the line scanning to necessary brightnesses. A light-wave synthesizer synthesizes the amplified light signal beams into one light beam. A light post scanning section performs frame scanning using the synthesized light beam in order to project it onto a screen. Accordingly, it is possible to display a highly bright image at a low cost on a large screen that realizes high definition and color reproducibility.

Abstract: There is proposed laser cathode-ray tube for simplification of its electrical circuit and lower manufacturing cost of its apparatuses, provided with an electron gun having a cathode for generating an electron beam; a laser screen having a laser target, of semiconductor plate, a focusing system for focusing the electron beam on the laser target, a deflection system for deflecting the beam and a cooling system for cooling the laser target, characterized in that the cathode is connected substantially to ground potential and the laser target is connected to high positive potential.

Abstract: The design and manufacturing processes for Hollow Cathode Assemblies (HCA's) that operate over a broad range of emission currents up to 30 Amperes, at low potentials, with lifetimes in excess of 17,500 hours. The processes include contamination control procedures which cover hollow cathode component cleaning procedures, gas feed system designs and specifications, and hollow cathode activation and operating procedures to thereby produce cathode assemblies that have demonstrated stable and repeatable operating conditions, for both the discharge current and voltage. The HCA of this invention provides lifetimes of greater than 10,000 hours, and expected lifetimes of greater than 17,500 hours, whereas the present state-of-the-art is less than 500 hours at emission currents in excess of 1 Ampere.

Abstract: A frame size regulating circuit provides high picture quality to a viewer by regulating a frame width according to a picture brightness signal and pulsewidth modulation signals. The circuit includes a microprocessor for generating pulsewidth modulation signals for respectively regulating horizontal and vertical sizes of the frame according to horizontal and vertical sync signals from the external, and a horizontal-size control signal generator part for generating a horizontal size control signal for regulating the horizontal size according to the first pulsewidth modulation signal of the microprocessor and a picture brightness signal from a flyback transformer.

Abstract: An improved pole piece structure for periodic-permanent-magnet focused traveling wave tubes is disclosed. In one embodiment, the pole pieces have two fold symmetry and the magnets are arranged about the tube axis in a pattern with two-fold symmetry. This structure accommodates the input or output waveguides while maintaining the symmetry of the magnet placement. This allows the electron beam to remain centered on the tube axis and, therefore, minimizes beam interception. Circuit heating is reduced and the power handling margin of the tube is increased in comparison to conventional TWT structures. In another embodiment, a triangular pole piece configuration is employed, eliminating displacement of the magnets at the coupler and sever cavities and providing a third cooling channel.

Abstract: A coupled cavity type traveling wave tube wherein selected matching and main cavities in the tube are provided with a layer of high resistance metal to minimize generation of reflected waves and thereby to achieve stable operation with high efficiency.

Abstract: A travelling-wave tube with improved heat dissipation characteristics, having a helical delay line disposed between an electron-beam generating system and an electron-beam receiver, with the helical delay line being supported by a plurality of retaining members, at least one of which is made out of a material different from the remaining members, the latter being made out of quartz and the first mentioned member being made of a material that has a better heat conducting capacity than the quartz rods, at least in radial direction, and has a dielectric constant that does not differ sufficiently from that of quartz to materially effect the gain of the tube or dispersion curve of the signal wave.

Abstract: A travelling wave tube having cavities coupled for the fundamental mode uses a periodic permanent magnetic focussing structure. Ferromagnetic plates which carry the magnetic field to the electron beam path are provided with axial extensions adjacent to the electron beam to increase the magnetic field strength.