Electric lamp and discharge devices – Cathode ray tube – Shadow mask – support or shield
Patent
1989-05-03
1991-02-19
DeMeo, Palmer C.
Electric lamp and discharge devices
Cathode ray tube
Shadow mask, support or shield
313407, H01J 2907
Patent
active
049947125
ABSTRACT:
A mounting arrangement for a foil shadow mask includes a plurality of elongated, generally linear spacers affixed to an inner surface of the flat glass faceplate of a color cathode ray tube (CRT) and arranged in a generally rectangular array. Attached to each spacer substantially along the length thereof is a respective elongated mounting spring. Each mounting spring includes a first portion attached to its associated spacer and a second flexible, resilient U-shaped portion to which a mask anchor is securely attached. Each peripheral edge portion of the foil shadow mask is attached to a respective mask anchor for maintaining the foil shadow mask in registration with light emitting phosphor elements on the CRT's faceplate. The mounting springs allow the glass faceplate as well as glass-based spacers to which the mounting springs are attached to expand during high temperature processing encountered in CRT fabrication without exceeding the foil shadow mask's tensile stress limits while maintaining the foil shadow mask in registration with the phosphor elements during lower temperature operation. Another embodiment contemplates a monolithic bi-metallic structure attached to the glass faceplate as well as to the foil shadow mask which is inflexible at lower operating temperatures to maintain the foil shadow mask in registration yet flexes at higher CRT processing temperatures during manufacture to allow for expansion of the glass faceplate without exceeding mask tensile stress limits.
REFERENCES:
patent: 2611100 (1952-09-01), Faulkner et al.
patent: 3392297 (1968-07-01), Schwartz
patent: 3970456 (1976-07-01), Branton
patent: 4193011 (1980-03-01), Pollehn et al.
patent: 4547695 (1985-10-01), Rath
patent: 4623820 (1986-11-01), Deal et al.
patent: 4695761 (1987-09-01), Fendley
patent: 4729907 (1988-03-01), Deal et al.
patent: 4748370 (1988-05-01), van den Broek
patent: 4827178 (1989-05-01), Higashinakagawa et al.
patent: 4891544 (1990-01-01), Capek et al.
DeMeo Palmer C.
Zenith Electronics Corporation
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