Current-sensitive color cathode ray tube

Details Current-sensitive color cathode ray tube Current-sensitive color cathode ray tube

H - Electricity

01

J

313/35.153

H01J 29/20 (2006.01) C09K 11/77 (2006.01) H01J 29/18 (2006.01) H01J 29/26 (2006.01)

Patent

CA 1178639

ABSTRACT OF THE DISCLOSURE A current-sensitive color cathode ray tube having a phosphor screen scanned by an electron beam from an electron-source, with the current density in said beam varied at substantially constant accelerating voltage is disclosed. In this case, the screen comprises a red-emitting phosphor having a sublinear characteristic in the intensity- current density relationship and a different color-emitting phosphor other than red having a linear or superlinear characteristic in the intensity-current density relationship, in which the red emitting phosphor has a following formula: (Ln1-xEux)2O2S wherein Ln is a material selected from the group consisting of Y, La, Gd and Lu, and x ranges from 0.05 to 0.10 and further, concentration of a rare earth impurity such as terbium Tb and praseodymium Pr is less than 10 ppm.

404160

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