Color CRT having a support frame assembly with detensioning mean

Details Color CRT having a support frame assembly with detensioning mean Color CRT having a support frame assembly with detensioning mean

1997-04-18

1999-09-14

Patel, Vip

Electric lamp and discharge devices

Cathode ray tube

Shadow mask, support or shield

313404, 313405, 313407, H01J 2907

Patent

active

059527749

ABSTRACT:
The present invention provides an improvement in a CRT (10) having a tension mask (24) and support frame assembly (35). The support frame assembly (35) is rectangular and has two long sides that parallel a central major axis thereof and two short sides that parallel a central minor axis thereof The mask (24) has a substantially cylindrical contour, being curved along the major axis and straight along the minor axis. The frame assembly (35) includes two first members (36, 38; 136, 138) that parallel the major axis and two second members (40, 42), attached to the ends of the first members, that parallel the minor axis. Each of the first members (36, 38; 136, 138) includes a rigid section (50; 150) and a compliant section (52; 152) cantilevered from the rigid section (50; 150). The compliant sections (52; 152) have a distal end (54; 154) and a proximal end (56; 156). The mask (24) is attached to the distal ends (54; 154) of the compliant sections (52; 152). The improvement comprises at least one of the compliant sections (52; 152) including an alloy portion (60; 160, 161) and a bimetal portion (58; 158) for relaxing the tension on the strands (32) of the mask (24) when subjected to an elevated temperature and restoring the tension on the strands (32) of the mask (24) at a temperature below the elevated temperature.

REFERENCES:
patent: 5111107 (1992-05-01), Kume et al.
patent: 5594300 (1997-01-01), Nosker et al.
patent: 5644192 (1997-07-01), Ragland, Jr.

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