A beam-index TV receiver for consumer application

The development of the first beam-index color television for the consumer market is described. The TV uses a 3.7-in beam-index cathode ray tube. A good index signal-to-noise (S/N) ratio was achieved by developing a photodetection system and using the 3/4 nonintegral method. Compact size (133 mm×133 mm×133 mm) for portable use was realized by extensively incorporating surface-mounted components, developing an extremely small flyback transformer (FBT), and designing ICs for handling complicated index processing circuits. Solutions to the inherent problems of small television, i.e. heat dissipation and reception by rod antennas, were developed. The heat problem was ameliorated by circuit integration of the index signal process and the design of a low-power-consumption deflection system. Tuner pack technology was applied to pack the index signal processing in a metal shield, thus suppressing extraneous radiation and making nonantenna reception possible