IMAGE FORMING APPARATUS

摘要

An image forming apparatus includes: an image bearing member; an electric potential sensor which detects electric potential of a toner image; a density sensor which acquires information of a density of the toner image; and a controller which controls contrast electric potential and the AC bias based on a result of the detection of the density sensor and a predetermined target value, wherein the controller decreases the development contrast, and increases the AC bias, when a charging electric potential difference, which is a potential difference between a potential of a predetermined toner image developed by the development device on the image bearing member and the DC bias applied to the development device when the predetermined toner image is developed, increases from a first predetermined value to a second predetermined value;

主权项

1. An image forming apparatus comprising:
an image bearing member which bears an image; a development device which develops a latent image formed on the image bearing member; a bias applying portion which applies a DC bias and an AC bias to the development device; an electric potential sensor which detects electric potential of a toner image formed on the image bearing member; a density sensor which acquires information relating to a density of the toner image; and a controller configure to control a development contrast which is a potential difference between a potential of a image area on the image bearing member and the DC bias based on a result of the detection acquired by the density sensor, and control the AC bias based on the result of the detection acquired by the density sensor; wherein said controller decreases the development contrast, and increases the AC bias, when a charging electric potential difference, which is a potential difference between a potential of a predetermined toner image developed by the development device on the image bearing member and the DC bias applied to the development device when the predetermined toner image is developed, increases from a first predetermined value to a second predetermined value;