Electric lamp and discharge devices – Cathode ray tube – Shadow mask – support or shield
Patent
1986-06-17
1988-05-17
Moore, David K.
Electric lamp and discharge devices
Cathode ray tube
Shadow mask, support or shield
313403, 313408, 427 68, 445 11, 445 12, H01J 2907, H01J 2932, H01J 9227
Patent
active
047453290
ABSTRACT:
A color cathode ray tube is disclosed having a front assembly with a shadow mask characterized by having circular apertures at the mask center, and apertures at least in the mask periphery increasingly elongated radially outwardly as a function of distance from the center. The elongation of the apertures is effective to reduce or eliminate the distortion of the deposits on the mask periphery produced by diffraction effects during photoscreening, and to form phosphor deposits compatible in size and shape with the electron beamlets. The screen of the tube according to the invention may have circular or near-circular phosphor deposits thereon. Tube types to which the invention can be applied include the conventional curved-screen/curved-mask tube, and the substantially flat faceplate tube that has a foil shadow mask suspended in tension a predetermined distance from the screening surface. A method is also disclosed for use in the photo-fabrication of a faceplate for an ultra-high resolution color cathode ray tube.
REFERENCES:
patent: 2947899 (1960-08-01), Kaplan
patent: 4139797 (1979-02-01), Rowe
Moore David K.
Wieder K.
Zenith Electronics Corporation
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