COLOR CATHODE-RAY TUBE HAVING UNIAXIAL TENSION FOCUS MASK

摘要

The present invention relates to a color cathode-ray tube (10) having an evacutated envelope (11) with an electron gun (26) therein for generating at least one electron beam (28). The envelope (11) further includes a faceplate panel (12) having a luminescent screen (22) with phosphor lines on an interior surface thereof. A uniaxial tension focus mask (25), having a plurality of spaced-apart first metal strands (40), is located adjacent to an effective picture area of the screen. The spacing between the first metal strands defines a plurality of slots (42) substantially parallel to the phosphor lines of the screen. Each of the first metal strands across the effective picture area of the screen has a substantially continuous first insulator layer (64) on a screen-facing side thereof. A second insulator layer (66) overlies the first insulator layer. A plurality of second metal strands (60) are oriented substantially perpendicular to the first metal strands and are bonded thereto by the second insulator layer. The first insulating layer has a coefficient of thermal expansion substantially matching, or slightly lower than, that of the first strands. The second insulating layer has a coefficient of thermal expansion that is substantially identical to that of the first insulating layer.