Cathode-ray tube having a stepped shadow mask

Details Cathode-ray tube having a stepped shadow mask Cathode-ray tube having a stepped shadow mask

H - Electricity

01

J

313/35.16

H01J 29/80 (2006.01) H01J 29/07 (2006.01)

Patent

CA 1111893

CATHODE-RAY TUBE HAVING A STEPPED SHADOW MASK ABSTRACT An improved color picture tube shadow mask has apertured portions through which electron beams pass to a phosphor screen, and other portions connecting the apertured portions through which the beams do not pass. The other portions are step risers aligned substantially parallel to electron beam paths at corresponding points within the tube, and offset adjacent apertured portions relative to the screen. The structure permits reduction in mask-frame assembly thickness for tubes with spherical faceplates, and also facilitate construction of flat faceplate tubes.

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