Shadow mask suspension means for color cathode ray picture tubes

Details Shadow mask suspension means for color cathode ray picture tubes Shadow mask suspension means for color cathode ray picture tubes

1980-07-14

1982-10-19

Demeo, Palmer C.

Electric lamp and discharge devices

Cathode ray tube

Shadow mask, support or shield

29 2515, 29 2519, 313406, H01J 2907, H01J 918

Patent

active

043552609

ABSTRACT:
Apparatus is disclosed for assembling a frameless, relatively thin and torsionally flexible shadow mask and four relatively thick and inflexible mask-suspension brackets. The apparatus, which is for use in the manufacture of color television cathode ray picture tubes, provides for conforming of the brackets to the contour of the skirt of the mask, and the welding of the brackets thereto. The brackets according to the invention have a planar central section and two arms for the embracing of and attachment to the skirt around the corners of the mask. Each bracket has at least one region in each arm adjacent to the central section that is perforated to decrease the cross-sectional area of the region and thus increase electrical resistance of the region. When an electrical current is applied through the bracket, the magnitude of the current and the reduction in cross-sectional area of the region is effective to selectively resistively heat the region to a plastic state whereby the bracket can be conformed to the desired contour of the mask without spring-back and without the deforming the mask. The method according to the invention provides for conforming the contour of the bracket to the contour of the mask.

REFERENCES:
patent: 3999098 (1976-12-01), Dougherty
patent: 4019231 (1977-04-01), Dougherty
patent: 4100451 (1978-07-01), Palac
patent: 4300071 (1981-11-01), Dougherty et al.
patent: 4317064 (1982-02-01), Dougherty

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