ELECTRON EMISSION DEVICE, CHARGING DEVICE WITH THE ELECTRON EMISSION DEVICE, IMAGE FORMATION APPARATUS WITH THE ELECTRON EMISSION DEVICE, AND METHOD OF CONTROLLING THE ELECTRON EMISSION DEVICE

摘要

PROBLEM TO BE SOLVED: To provide an electron emission device capable of having its lifetime prolonged by stably controlling the charging amount and charging potential of an electron emission object such as a photoreceptor drum.;SOLUTION: A control part 119 finds an estimated value MIe of a discharging current amount Ie corresponding to the amount (electron emission amount) of emitted electrons emitted from an electron emission element (111) based upon an in-element current amount Ip measured by an inflow ammeter 117 and a temperature T and a humidity H around the electron emission element 111 measured by an environment detection part 118, and controls a driving voltage Vd of a driving power source 115 so that the estimated value MIe reaches a target value AIe of the discharging current amount Ie.;COPYRIGHT: (C)2015,JPO&INPIT