Patent ID: 7941062

Claim:
An image forming apparatus including: a rotatable photosensitive member; a charging apparatus configured to charge a surface of the photosensitive member when applied with a charging voltage; an exposure apparatus configured to expose the surface of the photosensitive member after being charged, so as to form an electrostatic image; a developing apparatus configured to attach a developer to the electrostatic image and to develop the electrostatic image as a developer image when applied with a development voltage; a time information obtaining apparatus configured to obtain information regarding a photosensitive member rotation time that represents a time during which the photosensitive member is rotated, and information regarding a photosensitive member stop time that represents a time during which the photosensitive member is stopped; an environment measuring apparatus configured to measure information regarding temperature and information regarding absolute humidity; and a control apparatus configured to control an image formation condition based on the information regarding the temperature and the information regarding the absolute humidity which are measured by the environment measuring apparatus, and the information regarding the photosensitive member rotation time and the information regarding the photosensitive member stop time which are obtained by the time information obtaining apparatus when the absolute humidity is within a first range, wherein the control apparatus is configured to control the image formation condition based on the information regarding the temperature measured by the environment measuring apparatus, and the information regarding the photosensitive member rotation time and the information regarding the photosensitive member stop time which are obtained by the time information obtaining apparatus, without using the information regarding the absolute humidity measured by the environment measuring apparatus, when the absolute humidity is within a second range, wherein the second range corresponds to a higher humidity range than the first range.