The 68cm(29") and 78cm(33") color picture tubes with approximately 25mm and 32mm shorter in depth, respectively, than the conventional ones have been developed by the use of 112°deflection angle instead of 108°, and so on. In choosing the deflection angle, studies were made on power consumption, focus performance, vacuum stress, cost, etc. The 32.5mmφ LOLF electron gun has been developed as a measure against focus performance deterioration caused by a wider deflection angle. By the use of these tubes, 68cm and 78cm TV sets with 45cm and 50cm depth, respectively, have been realized.
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