Electric lamp and discharge devices – Cathode ray tube – Screen
Patent
1971-10-18
1976-04-20
Segal, Robert
Electric lamp and discharge devices
Cathode ray tube
Screen
313473, 313408, H01J 2928, H01J 2930, H01J 2932
Patent
active
039522253
ABSTRACT:
An image screen structure for a monochrome or a color cathode-ray tube, in which the phosphor screen is interposed between a composite mesh and the conventional reflective metal backing layer. The composite mesh comprises a reflective grille and a non-reflective grille in registration with the reflective grille. The reflective grille faces the phosphor screen so that light generated by phosphor excitation behind the non-reflective grille finds egress by multiple reflections between the reflective grille and the metal backing layer. In a color cathode-ray tube such as a tri-color shadow-mask television picture tube, the non-reflective and reflective grilles may be non-coherent with the mosaic phosphor screen, thus avoiding the necessity of complicated and costly processing which has been employed in the manufacture of black-surround color picture tubes. A substantial improvement in brightness/contrast performance is obtained as compared with the best prior art monochrome and color cathode-ray tubes.
REFERENCES:
patent: 2842697 (1958-07-01), Bingley
patent: 3362804 (1968-01-01), Hamilton
patent: 3569761 (1971-03-01), Lange
patent: 3614504 (1971-10-01), Kaplan
Pederson John J.
Segal Robert
Zenith Radio Corporation
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