Color picture tube having improved slit type shadow mask and...

Details Color picture tube having improved slit type shadow mask and... Color picture tube having improved slit type shadow mask and...

H - Electricity

01

J

316/12, 313/35.1

H01J 29/07 (2006.01) H01J 9/00 (2006.01) H01J 9/14 (2006.01)

Patent

CA 1142570

RCA 73,919 Abstract A color picture tube having a slit type apertured mask, wherein the slit apertures are arranged in columns and the apertures in each column are separated by webs is improved by increasing the radius of curvature of the ends of the apertures at the webs to substantially greater than half the width of the central portions of the respective apertures. Such aperture shape may be achieved by a method wherein the aperture image elements of a photomaster used in fabricating the mask have greater width at the ends than at the centers thereof.

351855

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