Electric lamp and discharge devices – Cathode ray tube – Shadow mask – support or shield
Patent
1976-02-02
1977-08-30
Segal, Robert
Electric lamp and discharge devices
Cathode ray tube
Shadow mask, support or shield
313482, H01J 2902, H01J 2907, H01J 3120
Patent
active
040457010
ABSTRACT:
This disclosure depicts a color cathode ray of the shadow mask type. A mask suspension system for establishing a predetermined spatial position of said mask relative to the inner surface of said 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 said 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 combination is characterized by each of the three suspension means comprising an integral modification of said 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 said faceplate. The resultant six-point engagement of the three corner-located means with the three integral modifications of the faceplate effect said angularly rigid and precise coupling of said mask to said 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 each 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.
REFERENCES:
patent: B523696 (1976-01-01), Groot
patent: 2824990 (1958-02-01), Haas
patent: 2942129 (1960-06-01), May
patent: 2961560 (1960-11-01), Fyler
patent: 3862448 (1975-01-01), Ishizuka et al.
patent: 3912963 (1975-10-01), Sedivy
patent: 3921024 (1975-11-01), Bakker et al.
patent: 3935496 (1976-01-01), Gijrath
Coult John H.
Segal Robert
Zenith Radio Corporation
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