COLOR PICTURE TUBE WITH SHADOW MASK HAVING IMPROVED MASK APERTURE COLUMN SPACING

摘要

Any number of collar 10 of the present invention is provided with a shadow mask 24 mounted on the inside at regular intervals with a viewing screen (22). The shadow mask has a rectangular outer peripheral surface consisting of two long sides and two short sides. In addition, the shadow mask has a mask and through the center of the long sides and parallel to the long axis (X) of the rectangular outer peripheral surface, the speed passing through the center of the mask parallel to the short side of the rectangular outer peripheral surface (Y). The shadow mask is provided with an array of apertures (35) including a slit-shaped opening (36) arranged in the form of a column (37) at the end of the parallel to the shorter edge of the inside. According to the color kinescope in accordance with the present invention, the major axis and parallel to a column for column spacing (a _H) is within the pseudo repeat variation, and comprises a doctor repeatedly changing (pseudo-cyclic variation) at least a portion of the shadow mask the complete cycle is characterized in that it occurs within the column for column spacing between 9 consecutive columns below the column.