| 摘要 |
PURPOSE:To improve the image reproduction of a color cathode-ray tube by adjusting the angle between the movable piece of a thin elastic member and the tube axis and the angle between an electron beam and the tube axis according to a given formula. CONSTITUTION:The side wall of a shadow mask 15 having a thermal expansion coefficient of alpham for 200 deg.C is fixed to a mask frame 17 having a thermal expansion coefficient of alphaf for the above temperature range. A thin elastic member 22 is installed between a mask frame 17 and a stud pin 10 which is buried in the inner surface of the panel 1. The angle (alpha) between the movable piece 22a of the member 22 and the tube axis 20 and the angle (beta) between the tube axis 20 and an electron beam 24 passing through the outermost opening of the shadow mask 15 located near the member 22 are adjusted according to the formula. Due to the above structure, the image reproduction of the color cahtode-ray tube is improved. |
