Mask-frame combination for a color picture tube

Details Mask-frame combination for a color picture tube Mask-frame combination for a color picture tube

1992-06-12

1994-10-25

Yusko, Donald J.

Electric lamp and discharge devices

Cathode ray tube

Shadow mask, support or shield

313408, H01J 2907

Patent

active

053592590

ABSTRACT:
A mask-frame combination for a color picture tube includes a metal mask (12) placed over the frame with a skirting that overhangs the frame with an overhang height (H) and that is bent back toward the frame, and includes spot welds (15.1-15.12) located around the mask skirting for attaching the mask to the frame, wherein the mask skirting (13) bears against the outside of the frame (11) for attaching the mask where it is bent back, wherein the spot welds are arranged on each side of the long sides in such a manner that in each long side there is a central spot weld situated close to the mid-point of the long side and an outer spot weld on each side of the central spot weld and separated from the central spot weld by a distance of between D/14 and D/9, where D equals the length of the diagonal of the frame, and wherein the mask skirting is provided on each long side with openings (17) on two sides of each outer spot weld and adjacent thereto.

REFERENCES:
patent: 3516147 (1970-06-01), Seedorff et al.
patent: 4806820 (1989-02-01), Berner et al.
patent: 5218265 (1993-06-01), Reidinger et al.

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