Image forming apparatus and method capable of weakening electric field formed under printing head

摘要

An image forming apparatus includes a printing device; a printing medium conveying unit to convey a printing medium, a first electric charger to charge the printing medium conveying unit, a second electric charger to charge the printing medium conveyed by the printing medium conveying unit, a first surface potential detector to detect a surface potential of the printing medium bearing the electric charge, a second surface potential detector to detect a surface potential of the printing medium bearing the electric charge, and a controller to adjust a power supply voltage supplied to each of the first and second electric chargers in accordance with each of surface potentials detected by the first and second surface potential detectors. The first and second surface potential detectors are located at different positions in a conveying direction in which the printing medium is conveyed by the printing medium conveying unit.

主权项

1. An image forming apparatus, comprising:
a printing device to eject a droplet and form an image on a printing medium; a printing medium conveying unit to convey the printing medium with the image in a prescribed conveying direction; at least one first electric charger to charge the printing medium conveying unit; a second electric charger to charge the printing medium conveyed by the printing medium conveying unit; a first surface potential detector to detect a surface potential of the printing medium bearing the electric charge; a second surface potential detector to detect a surface potential of the printing medium bearing the electric charge; and a controller to adjust a power supply voltage supplied to each of the at least one first electric charger and the second electric charger in accordance with each of surface potentials detected by the first surface potential detector and the second surface potential detector, wherein the first surface potential detector and the second surface potential detector are located at different positions in the conveying direction in which the printing medium is conveyed by the printing medium conveying unit.