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

96/231

H01J 9/227 (2006.01) G03C 7/12 (2006.01) G03F 7/20 (2006.01)

Patent

CA 1282990

Abstract of the Disclosure A method of screening a line screen slit mask color picture tube 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. Such method further 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 perpendicularly to the longitudinal axis of the line light source. The improvement comprises moving both the faceplate panel and the cylindrical shaped lens in synchronization, in a direction substantially parallel to the line light source, during the exposing step.

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