METHOD AND DEVICE FOR OPTIMIZATION OF LOCATION OF SHADING BOARD, AND SHADING DEVICE

摘要

PURPOSE: To optimize the location of a light shutoff board in a panel assembly of a cathode-ray tube so that the exposure light is not incident to a dummy slit when a phosphor is exposed through a slit which constitutes a color selection mechanism. ;CONSTITUTION: A light shutoff board 21 in the condition inclined with reference to a slit is advanced toward the outermost slit 14 so that one end 14A of the outermost slit is blocked with one end of the board. The board is further advanced and stopped when its other end blocks the other end 14B of the outermost slit 14. In the condition that the latter other end of board is fixed substantially, the other end of the board is retreated and located in the final position. From this location, the board is again advanced until it blocks the outermost slit entirely.;COPYRIGHT: (C)1996,JPO