COLOR CATHODE RAY TUBE HAVING PARTICULAR EFFECTIVE INNER PANEL SURFACE AND SHADOW MASK EFFECTIVE SURFACE SHAPES.

摘要

PROVIDED IS A COLOR CATHODE RAY TUBE, WHICH COMPRISES A PANEL (12) INCLUDING A SUBSTANTIALLY RECTANGULAR EFFECTIVE PORTION (10), OF WHICH THE OUTER SURFACE IS A FLAT SURFACE OR A SLIGHTLY CURVED SURFACE, AND A SHADOW MASK (19) HAVING AN EFFECTIVE SURFACE OPPOSITE THE INNER SURFACE OF THE EFFECTIVE PORTION OF THE PANEL (12). IN THIS COLOR CATHODE RAY TUBE, THE INNER SURFACE OF THE EFFECTIVE PORTION (10) OF THE PANEL (12) IS A CURVED SURFACE HAVING A SUBSTANTIALLY INFINITE CURVATURE RADIUS RXP1 IN THE MAJOR-AXIS DIRECTION ON THE MAJOR AXIS THEREOF NEAR THE CENTER, A PREDETERMINED CURVATURE RADIUS RXP2 IN THE MAJOR-AXIS DIRECTION NEAR PERIPHERAL PORTIONS ON THE MAJOR AXIS, AND ANOTHER PREDETERMINED CURVATURE RADIUS IN THE MINOR-AXIS DIRECTION ON THE MINOR AXIS THEREOF. THIS COLOR CATHODE RAY TUBE, WITH ITS PANEL (12) HAVING THE SUBSTANTIALLY FLAT OUTER SURFACE, ENJOYS IMPROVED VISIBILITY AND HIGHER STRENGTH FOR THE MAINTENANCE OF THE CURVED SURFACE OF THE SHADOW MASK (19). FIGURE 3.