Electric lamp and discharge devices – Cathode ray tube – Shadow mask – support or shield
Patent
1976-04-12
1978-07-11
Segal, Robert
Electric lamp and discharge devices
Cathode ray tube
Shadow mask, support or shield
313406, H01J 2907, H01J 3120
Patent
active
041004515
ABSTRACT:
This disclosure depicts, in a color cathode ray tube, the combination comprising an approximately rectangular, flangeless, curved 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 low mass, approximately rectangular, non-self-rigid shadow mask has a central portion with a pattern of electron-transmissive apertures registered with the pattern of phosphor triads. The mask has a rim portion providing substantial rigidity with respect to axes normal to the sides thereof while providing for flexure of the mask with respect to its diagonals. A mask suspension system for establishing a predetermined position of the mask relative to and at a predetermined spacing from the inner surface of the faceplate includes four suspension means for mechanically coupling the mask directly to corner portions of the faceplate. The suspension means are located one at each corner of the mask to permit the mask to flex about its diagonals and conform to the contour of the faceplate despite any twist-wise deformation thereof, thereby maintaining said predetermined spacing between the mask and the faceplate inner surface.
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Coult John H.
Segal Robert
Zenith Radio Corporation
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