Method for screening line screen slit mask color picture tubes

Details Method for screening line screen slit mask color picture tubes Method for screening line screen slit mask color picture tubes

H - Electricity

01

J

316/11, 315/13

H01J 9/227 (2006.01)

Patent

CA 1230638

Abstract of the Disclosure The present invention is an improvement in a method of screening a line screen slit mask color picture tube. Such method includes coating a faceplate panel of the tube with a photosensitive material, inserting a slit shadow mask into the panel, and exposing the photosensi- tive material by passing light from a line light source through the slits of the mask. The improvement comprises positioning a generally cylindrical shaped lens between the line light source and the faceplate panel during exposure of the photosensitive material. The longitudinal axis of the lens is oriented perpendicular to the longitudinal axis of the line light source. Because of the presence of the lens, the images of the line light source projected through the slits of the mask onto the photosensitive material, at locations off the major and minor axes of the panel, are rotated toward parallelism with the minor axis, thereby resulting in exposure of straight smooth lines on the photosensitive material.

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