Patent ID: 9146515
Filing Date: 2015-09-29
Classification: G03G

Abstract:
1. An image forming apparatus comprising: a photosensitive member configured to rotate; an exposure unit configured to expose the photosensitive member to form an electrostatic latent image on the photosensitive member; a developing unit, including a developer bearing member configured to bear toner and rotate, configured to develop the electrostatic latent image on the photosensitive member using the toner borne by the developer bearing member; a measuring unit, including an attracting unit configured to attract the toner on the developer bearing member, configured to measure a charge amount of the toner attracted to the attracting unit; and a control unit configured to control an exposing condition of the exposure unit, based on the charge amount measured by the measuring unit, wherein in the case where a time necessary for the developer bearing member to rotate from a measurement position where the attracting unit attracts the toner on the developer bearing member to a developing position at which the electrostatic latent image on the photosensitive member is developed by the toner on the developer bearing member is represented by a time Tqcm, a time necessary for the photosensitive member to rotate from an exposure position at which the exposure unit exposes the photosensitive member to the developing position is represented by a time Tetd, and a time necessary for the control unit to control the exposing condition based on the charge amount measured by the measuring unit is represented by a time Tp, the attracting unit is disposed so that Tqcm≧Tedt+Tp holds true.