Cathode-ray display tube for color printers

摘要

A cathode-ray display tube for color printers has a phosphor screen comprises a blue-emitting phosphor having a maximum ability of color emission in the range of wavelengths of 480 m mu and below with a radiant energy in the range of wavelengths of about 480 m mu and higher being 10% or less of the overall radiant energy; a green-emitting phosphor having a maximum ability of color emission in the range of wavelengths of 520 through 570 m mu with a radiant energy in the range of wavelengths of about 500 m mu and less and of about 630 m mu and higher being 5% or less of the overall radiant energy; and a red-emitting phosphor having a maximum ability of color emission in the range of wavelengths of 630 through 750 m mu with a radiant energy in the range of wavelengths of about 590 m mu and less being about 10% or less of the overall radiant energy. Phosphor dots located beyond the area of normal raster are sensed to provide timing signals for controlling beam deflection.