METHOD AND APPARATUS FOR MAINTAINING SPACING BETWEEN TENSION FOCUS MASK STRANDS IN A TENSION FOCUS MASK

摘要

A method and apparatus of maintaining spacing between tension focus mask strands (44) in a tension focus mask (30) in a cathode ray tube (10). The method of making the tension focus mask includes steps of providing a mask frame (306) having vertical strands attached thereto; applying permanent adhesive to a screen-side of the mask strands; affixing at least one novel non-permanent horizontal guide member (302) to a gun-side of the mask strands with a non-permanent adhesive; applying crosswires (46) to the screen-side of the strands; and thermally processing the apparatus, thereby (1) permanently attaching the crosswires to the mask strands and (2) volatilizing the adhesive on the gun-side of the mask strands such that any non-permanent guide members detach from the mask strands. The guide members maintain the vertical mask strand during: (1) the application of the horizontal crosswires to the screen-side of the mask and (2) the subsequent thermal processing.