A phosphor for manufacturing a dry electrophotographic screen of a cathode ray tube, and a method of manufacturing a dry electrophotographic screen using the phosphor

摘要

The present invention provides a phosphor for manufacturing a dry electrophotographic screen of a cathode ray tube excellent in triboelectrification characteristics.;The phosphor is characterized in that the surface of the particles is coated with a cellulose polymer. The cellulosic polymer coated on the phosphor is hydroxypropylcellulose or hydroxyethylcellulose in an amount of 0.1 to 0.5 wt% with respect to the phosphor, and the conventional coating method such as cellulosic It is possible to coat the cellulosic polymer on the phosphor particles by dispersing and mixing the phosphor in an aqueous solution of the polymer, leaving it to stand, separating and removing the supernatant, drying and sieving.;This enables charging for development through friction with the sidewall portion of the venturi tube 146 or the like, so that not only all the problems in charging by discharging are solved, but also, And the developing device can be simply constituted.