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Shadow mask support in a color cathode ray tube

  • US 4,308,485 A
  • Filed: 03/08/1979
  • Issued: 12/29/1981
  • Est. Priority Date: 03/13/1978
  • Status: Expired due to Term
First Claim
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1. In a colour cathode ray-tube having a plate and a shadow mask mounted behind said plate, the combination of a shadow mask having a light grid face formed integrally with a rearwardly extending peripheral wall edge substantially rectangular in shape and a rigid frame secured to said plate comprising a substantially rectangular skirt having a front and rear edge with said skirt substantially parallel to and fitting with said wall edge of the mask, said wall edge of the mask and said skirt of the frame being secured to one another by a plurality of welding points spaced from each other, said skirt comprises a plurality of bosses spaced apart therearound which provide contact of said skirt with said wall edge along a plurality of areas of limited extent at spaced apart locations therearound, said bosses extend only part of the distance between said front and rear edge and protrude inwardly of said skirt adjacent to said rear edge thereof, said wall edge extending between a peripheral line around said light grid face and a rearward edge thereof, and said wall edge contacts said bosses near said rearward edge to leave a contactless peripheral zone between said skirt and said wall edge next to said peripheral line.

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