Image forming device having a shared voltage supply and constant current control

摘要

An image forming device, comprising: at least one photosensitive body; scorotron chargers that charge the at least one photosensitive body; a charge voltage applying circuit to which the scorotron chargers are commonly connected, the charge voltage applying circuit being configured to apply a voltage to the scorotron chargers; wires respectively provided for the scorotron chargers; grid electrodes respectively provided for the scorotron chargers; a current detection unit configured to detect a grid current of each of the grid electrodes; and a grid current control unit configured to execute a constant-current control for a maximum grid current which is a maximum of grid currents flowing through the grid electrodes so that the maximum grid current is kept at a first threshold larger than or equal to a reference value by adjusting an output of the charge voltage applying circuit.

主权项

1. An image forming device, comprising:
at least one photosensitive body; a plurality of scorotron chargers that charge the at least one photosensitive body: a charge voltage applying circuit to which the plurality of scorotron chargers are commonly connected, the charge voltage applying circuit being configured to apply a voltage to the plurality of scorotron chargers; wires respectively provided for the plurality of scorotron chargers; grid electrodes respectively provided for the plurality of scorotron chargers; a current detection unit configured to detect a grid current of each of the grid electrodes; and a grid current control unit configured to execute a constant-current control for a grid electrode which has a maximum grid current among the grid electrodes so that the maximum of a grid current among the grid currents is kept at a first threshold by adjusting an output of the charge voltage applying circuit, the first threshold being larger than a first reference value but lower than or equal to a second reference value.