Patent ID: 9329532
Filing Date: 2016-05-03
CPC Classification: G03G

Claim Text:
1. An image forming apparatus comprising: a photosensitive member; an image forming portion configured to form an electrostatic image on the photosensitive member to deposit a toner image on an image portion of the electrostatic image; an intermediary transfer member configured to carry the toner image primary-transferred from the photosensitive member at a primary-transfer position; a transfer member, provided contactable to an outer peripheral surface of the intermediary transfer member, configured to secondary-transfer the toner image from the intermediary transfer member onto a recording material at a secondary-transfer position; a constant-voltage element, electrically connected between the intermediary transfer member and a ground potential, configured to maintain a predetermined voltage by passing of a current therethrough; a power source configured to form, by applying a voltage to the transfer member to pass the current through the constant-voltage element both of a secondary-transfer electric field at the secondary-transfer position and a primary-transfer electric field at the primary-transfer position; a detecting member configured to detect a temperature and a humidity in an ambient condition; and a controller configured to control a potential of the image portion depending on a detection result of the detecting member.