Shadow mask assembly for color cathode ray tube

Details Shadow mask assembly for color cathode ray tube Shadow mask assembly for color cathode ray tube

1989-06-14

1991-02-26

DeMeo, Palmer C.

Electric lamp and discharge devices

Cathode ray tube

Shadow mask, support or shield

313355, 313403, 445 47, H01J 2907

Patent

active

049964585

ABSTRACT:
A laminated shadow mask assembly for use in a color picture tube including an evacuated envelope having a longitudinal axis and also having a phosphor deposited screen lying generally perpendicular to the longitudinal axis, which assembly comprises a finely perforated, laminated shadow mask having a plurality of apertures defined therein in a predetermined pattern; a support frame for the support of the laminated shadow mask; and expansion compensating couplings disposed around the support frame for connecting the support frame in position within the evacuated envelope with the laminated shadow mask held generally parallel to the phosphor deposited screen. The finely perforated, laminated shadow mask comprises at least two perforated metal sheets each having a perforated area having minute holes defined therein and also having a non-perforated area, which minute holes in both of the perforated metal sheets form the apertures in the finely perforated, laminated shadow mask when the perforated metal sheets are connected together by means of a plurality of weld deposits formed within the perforated areas thereof to connect the perforated metal sheets firmly together.

REFERENCES:
patent: 3787939 (1974-01-01), Tomita et al.
patent: 3794873 (1974-02-01), Kaplan et al.
patent: 3909656 (1975-09-01), Stachniak
patent: 4392914 (1983-07-01), Takenaka et al.

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