Abstract: Upper end edges (7a, 7b, 7c) of positioning reference portions (5a, 5b, 5c) to be formed on outer walls of a funnel (1) for cathode ray tube are formed at distances (downwardly) toward a narrow open end (3) of the funnel from a maximum profile line (4) formed in the vicinity of a wide open end (2) by mold matching of forming mold at the time of press molding, thereby suppressing molding defects such as deficiency and wrinkle resulting from that glass is not completely filled, which are likely to occur in reference surfaces (6a, 6b, 6c) of the positioning reference portions, and eliminating occurrences of small cracks caused by concentration of heat stress, which are likely to occur in the upper end edges (7a, 7b, 7c) of the reference portions, to improve the productivity of the funnel.

Abstract: Manufacturing steps for a cathode ray tube or a glass bulb for the cathode ray tube are controlled in such a manner that a two-dimensional matrix code 3 comprised of a plurality of dots is marked by laser in an outer side surface of a glass bulb 1, 5, the two-dimensional matrix code 3 containing the information which can identify individually glass bulbs, and the manufacturing steps are conducted by using a computer and the particulars specified by the serial information.

Abstract: Manufacturing steps for a cathode ray tube or a glass bulb for the cathode ray tube are controlled in such a manner that a two-dimensional matrix code 3 comprised of a plurality of dots is marked by laser in an outer side surface of a glass bulb 1, 5, the two-dimensional matrix code 3 containing the information which can identify individually glass bulbs, and the manufacturing steps are conducted by using a computer and the particulars specified by the serial information.

Abstract: A glass panel for a cathode ray tube including a substantially rectangular face portion and a skirt portion. Further constituting a side wall of the face portion, a compressive stress layer having a thickness of at least {fraction (1/10)} of the thickness of the face portion, is formed on each of the inner and outer surfaces of a useful screen area of the face portion, so as to satisfy 0.4≦&sgr;di/&sgr;ci≦1.0, where &sgr;ci is the compressive stress on the inner surface at the center of the useful screen area, and &sgr;di is the compressive stress on the inner surface in the vicinity of ends of diagonal axial lines of the useful screen area.