COLOR CATHODE RAY TUBES WITH A TIGHTENED SHADE MASK WITH LOW EXPANSION COEFFICIENT ON A FRAME STRUCTURE HAVING HIGHER EXPANSION COEFFICIENT

摘要

A color picture tube has a tensioned mask supported by a support frame mounted within the tube. The mask has a significantly lower coefficient of thermal expansion than the frame. The mask has an active apertured portion formed by a plurality of parallel vertically extending strands, through which electron beams pass during operation of the tube, and two opposite side border portions outside the active apertured portion. The two opposite side border portions have tie bars that extend between the vertical strands of the mask. The tie bars accommodate expansion of the frame, while substantially maintaining the positions of the vertical strands in the active portion of the mask.