25-V Inch 114-Degree Trinitron Color Picture Tube and Associated New Developments

The TRINITRON system was first produced in 1968, employing a 12V" picture tube(1). Since that time, the picture tube size range has been extended both toward larger (21 V") and smaller (5 V") sizes. TRINITRON color picture tubes have so far been designed in eight different sizes; if the variety of electron guns and deflection angles is included, a total of twelve different kinds of TRINITRON tubes have been commercially marketed. The initial tubes were designed with a 90°deflection angle; since then 114°and 122°deflection tubes have also been developed. A number of innovative techniques have been employed in the newly designed tubes in order to maintain good picture quality. In particular, attention has been paid to the manufacturing aspects.