| 摘要 |
A VACUUM ENVELOPE FOR CATHODE-RAY TUBE COMPRISES A PANEL HAVING A FLAT OUTER SURFACE AND A CONVEX CURVED INNER SURFACE, AND A SUBSTANTIALLY RECTANGULAR FLUORESCENT SCREEN (14) WITH AN ASPECT RATIO OF M:N IS FORMED IN THIS INNER SURFACE. IN THE INNER SURFACE OF THE PANEL (12), THE GAPS &Dgr;H(R), &Dgr;V(R), AND &Dgr;D(R) FROM THE CENTER ON THE HORIZONTAL, VERTICAL AND DIAGONAL AXES OF THE FLUORESCENT SCREEN (14) ARE DETERMINED IN ASPECIFIC RELATIONSHIP. BY FORMING A PROPER CURVED SURFACE IN THE INNER SURFACE OF A PANEL (12) WHOSE OUTER SURFACE IS A FLAT SURFACE, THE STRENGTH OF THE VACUUM ENVELOPE IS MAINTAINED, DETERIORATION OF VISUALRECOGNITION OF FLATNESS IS SUPPRESSED, AND, IN THE COLOR CATHODE RAY TUBE, THE WORKABILITY OF THE SHADOW MASK IS FURTHER ENHANCED.(FIGURE 1)
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