H - Electricity – 01 – J
Patent
H - Electricity
01
J
313/35.166
H01J 29/07 (2006.01)
Patent
CA 1058270
ABSTRACT OF THE DISCLOSURE This disclosure depicts a color cathode ray tube of the shadow mask type. More particularly, there is disclosed an approximately rectangular faceplate supporting on a concave inner surface thereof in a central region a phosphor screen comprising a pattern of red-emissive, blue-emissive and green- emissive phosphor triads. A lightweight. approximately rectangular shadow mask has a central portion which has a curvature related to the curvature of the faceplate inner surface and which contains a pattern of electron-transmissive apertures registrable with the pattern of phosphor triads. The mask has means providing substantial rigidity with respect to axes normal to the sides thereof, but providing for flexure of the mask with respect to its diagonals. A mask suspension system for establishing a predetermined spatial position of the mask relative to the inner surface of the faceplate is disclosed as comprising four suspension means for mechanically coupling the mask to the faceplate, the suspension means being located one at each corner of the mask to permit the mask to flex about the diagonals and conform to the contour of the faceplate. All four of the suspension means have means effecting a predetermined spacing of the mask from the inner surface of the faceplate. Three of the four suspension means also effect an angularly rigid and precise coupling of the mask to the faceplate. The combina- tion is characterized by each of the three suspension means comprising an integral modification of the faceplate inner surface which defines two angularly spaced, axially convergent engagement surface areas. The mask has in each of three corner portions associated with the three suspension means, corner-located means for making angularly retentive, two-point engagement with the two angularly spaced engagement surface areas on one of the modifications of the faceplate. The resultant six-point engagement of the three corner-located means with the three integral modifications of the faceplate effect the angularly rigid and precise coupling of the mask to the faceplate. The combination also includes means for immovably holding the four mask corners on the faceplate when the tube is assembled. The mask corner portions are structured to have high radial compliance such that upon thermal expansion of the mask, any radial loads imposed on the mask corners are purely radial and are of insufficient magnitude to significantly deform the mask.
263952
Dougherty Lawrence W.
LandOfFree
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