REGENERATING METHOD OF PHOTOCONDUCTIVE CADMIUM SULFIDE POWDER

摘要

PURPOSE:To enable restoration of the characteristics such as sensitivity, light attenuating rate equiv. to the characteristics in the initial period of production by subjecting the photoconductive cadmium sulfide powder activated by Cu, In which is deteriorated owing to a secular change to heat-treatment within a specific temp. range in the presence of a specific ratio of active carbon. CONSTITUTION:Active carbon at 1-50g for each 100g of the photoconductive CdS activated by doping of Cu and In and is deteriorated during long-term preservation is put together with said CdS into a stoppered glass vessel and is subjected to a heat treatment for 1-4 weeks in a hot wind circulation type dryer or the like. The time is shorter as the temp. is higher but the resistance is lowered and the moisture-proof characteristic deteriorates at =100 deg.C. The characteristics such as sensitivity, light attenuating rate are thus restored equivalently to the characteristics in the initial period of production. The CdS having the restored characteristics is usable for manufacture of a photosensitive body. The active carbon may be active carbon for vapor phase adsorption or active carbon for desulfurization. A better result is obtainable with the latter than the former.