Method of assemblying a tensioned shadow mask and support frame
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United States of America Patent
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-
Sep 3, 1991
Grant Date -
N/A
app pub date -
Jul 23, 1990
filing date -
Jul 23, 1990
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The present invention provides an improved method of assemblying a rectangular tensioned shadow mask wherein the two long sides are welded to two curved frame members paralleling the major axis. The improvement comprises forming two subassemblies of said frame, each subassembly including one of the curved members and two partial straight members, each partial straight member being attached at 90 degrees to an end of the curved member. Next, the two subassemblies are positioned in approximately their final positions with the partial straight members on each side of the frame overlapping each other but forming an angle less than 180 degrees on the side of the frame of the intended mask attachment. The long sides of the mask are next welded to the curved members. Now, the subassemblies are rotated until the partial straight members are aligned, to apply tension to the two curved members to place at least a central portion of the shadow mask under a predetermined tension. Next, pressure is applied to the ends of one of the curved members in a direction away from the other curved member to place at least the side portions of the shadow mask under the predetermined tension. Finally, the partial straight members are welded together where they overlap to form complete straight members extending between the curved members.
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