Color cathode ray tube and tensible shadow mask blank for use th

Details Color cathode ray tube and tensible shadow mask blank for use th Color cathode ray tube and tensible shadow mask blank for use th

1986-07-02

1988-08-30

Rowan, Kurt

Electric lamp and discharge devices

Cathode ray tube

Shadow mask, support or shield

445 47, H01J 918

Patent

active

047679620

ABSTRACT:
A shadow mask blank is disclosed for use in the manufacture of an ultra-high resolution color cathode tube. The mask blank is adapted to be expanded and secured under tension in spaced adjacency to the screen of the tube. The blank comprises a central field of electron-beam-passing apertures, an outer band adapted to be gripped during the expanding, and at least one field of selectively weakened metal between the central field and the outer band. The selectively weakened metal is effective to equalize stress and prevent wrinkling of the blank under electron beam heating when the blank is expanded and secured under tension. An inner band peripheral to the central field may be provided for mounting the blank on a support structure and securing it thereto. Means may also be provided for linking the inner band with the outer band to selectively strengthen weakened areas.

REFERENCES:
patent: 2625734 (1953-01-01), Law
patent: 3390447 (1968-07-01), Mears
patent: 3809945 (1974-05-01), Roeder
patent: 3862448 (1975-01-01), Ishizuka
patent: 3894321 (1975-07-01), Moore
patent: 4437036 (1984-03-01), Ragland, Jr.
patent: 4599533 (1986-07-01), Ragland, Jr.
patent: 4652791 (1987-03-01), Palac et al.

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