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US 6,590,331 B1Granted
CRT with implosion-proof band and method for manufacturing the same
AssigneeKabushiki Kaisha Toshiba
InventorsKoichi Soneda, Masayoshi Ishikawa
Life of this patent
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Abstract
A vacuum envelope of a cathode ray tube includes a substantially rectangular panel with a skirt portion standing on an outer peripheral edge thereof. A substantially rectangular implosion-proof band made of metal is banded on the outer surface of the skirt portion. The implosion-proof band has a pair of long sides and a pair of short sides, and a yield point of a middle portion of each of the long sides differs from that of a middle portion of each of the short sides.
Claims10
A cathode-ray tube comprising:
- a vacuum envelope including a rectangular panel having a skirt portion;
- a phosphor screen formed on an inner surface of the panel;
- an electron gun provided in the vacuum envelope, for emitting an electron beam to the phosphor screen;
- and
- a substantially rectangular implosion-proof band having a pair of first side portions opposed to each other and a pair of second side portions crossing the first side portions and banded against an outer surface of the skirt portion, at least part of each of the first side portions of the implosion-proof band having a yield point which is different from that of another part of the implosion-proof band.
2 more elements
A method for manufacturing a cathode-ray tube, comprising the steps of:
- preparing a vacuum envelope including a panel with a skirt portion standing on an outer peripheral edge thereof;
- preparing an implosion-proof band formed of metal and shaped in a rectangular frame, the implosion-proof band having a pair of first side portions opposed to each other and a pair of second side portions opposed to each other;
- expanding the implosion-proof band by heating such that at least part of each of the first side portions and another part of the implosion-proof band are heated at different temperatures to cause yield points of said at least part and said another part to differ from each other;
- and
- mounting the implosion-proof band expanded by heating on an outer surface of the skirt portion, then cooling the implosion-proof band, and banding the outer surface of the skirt portion with the implosion-proof band.
2 more elements
Dependencies are inferred from the claim text.