Strengthened CRT aperture mask frame
AssigneeNorth American Philips Consumer Electronics Corp.
InventorPeter G. Puhak
Life of this patent
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Abstract
The invention provides improved strengthening means for the inherently weak corner regions of the framing member of a rectangular color CRT aperture mask-frame assembly. The improved means are in the form of crescent-shaped indentations discretely positioned to add strength to the corner material by substantially following the natural flow of the material thereat. The termini of the crescents are rounded and tapered to minimize stress concentrations in the regions.
Claims6
An improvement in the metallic perimetrical framing member of a substantially rectangular aperture mask-frame assembly of the type positioned in a color cathode ray tube in spaced relationship within the viewing panel adjacent the cathodoluminescent screen disposed thereon;
- said framing member being an integration of top, bottom and side elements transitionally combined at angular corner regions to provide a continuous perimetrical supporting structure having X and Y axes of reference therethrough;
- said member evidencing a substantially L-shaped cross-sectional configuration having a substantially formed ledge portion instanding from an integral edge-related perimetrical upstanding sidewall portion, said ledge portion evidencing an exterior surface and an interior surface from which said sidewall portion is in substantially perpendicular relationship;
- said sidewall having a terminal contour whereupon the apertured mask member of said mask-frame assembly is subsequently positioned and affixed, said improvement being means for strengthening the angular corner regions of said framing member and comprising:
- a substantially crescent-shaped indentation, having concave and convex edges and rounded termini, formed in said ledge portion at each of said corner regions;
- each of said crescent shapings being oriented with said concave edge thereof facing the origin of said axes;
- and whereof a bisector of each of said corner regions is substantially a bisector of the respective crescent shaping associated therewith.
Dependencies are inferred from the claim text.