Cold-fired molded steel with high strength and extremely high durability and creep resistance

摘要

The color picture tube improved to lower the aging of resolution by establishing a magnetic focusing device near the beam passing hole. the magnetic focusing device has two magnetic substances on the direction of beam, and the one becomes magnetized at one polarity, the other becomes magnetized at the opposite polarity. The thickness of the magnetic substances of the perpendicular direction to the holes is made thinner than that of the array direction of holes.