Image forming apparatus having control of exposure and charging depending on detected temperature

In an electrophotographic type of image forming apparatus comprising:

• a photosensitive body rotatable in a predetermined direction;
• a charging member that charges a surface of said photosensitive body by contact with said photosensitive body;
• an exposure device that exposes the surface of said photosensitive body charged by said charging member to light in order to produce an electrostatic latent image;
• temperature detecting means for detecting a temperature of said charging member;
• voltage correcting means for correcting a voltage to be applied to said charging member;
• amount-of-light correcting means for correcting an amount of exposure light of said exposure device;
• aging charge detecting means for detecting an aging change of said photosensitive body;
• and
• correction rule changing means for changing a correction rule carried out for the applied voltage corrected by said voltage correcting means in accordance with the temperature detected by said temperature detecting means;
• wherein, when a detection result obtained by said temperature detecting means is lower than a predetermined temperature value, said voltage correcting means first makes correction of the applied voltage under another correction rule presented by said correction rule changing means, and consecutively said amount-of-light correcting means makes correction of the amount of exposure light.

An image forming apparatus comprising:

• a photosensitive body rotatable in a predetermined direction;
• a charging member that charges a surface of said photosensitive body by contact with said photosensitive body;
• an exposure device that exposes the surface of said photosensitive body charged by said charging member to light in order to produce an electrostatic latent image;
• temperature detecting means for detecting a temperature of said charging member;
• voltage correcting means for correcting a voltage to be applied to said charging member;
• amount-of-light correcting means for correcting an amount of exposure light of said exposure device;
• aging change detecting means for detecting an aging change of said photosensitive body;
• correction rule changing means for changing a correction rule for the applied voltage corrected by said voltage correcting means in accordance with an amount of aging change detected by said aging change detecting means;
• and
• potential correcting means for correcting a potential of the surface of said photosensitive body which has been charged in an image forming process proceeding from charge to transfer on the basis of a detection result obtained in such a way that a voltage corrected by said voltage correcting means is applied to said charging member in order to charge the surface of said photosensitive body and then electricity of said photosensitive body is removed and a residual potential after the removal is detected;
• wherein, when a detection result obtained by said temperature detecting means is lower than a predetermined temperature value, said voltage correcting means first makes correction of the applied voltage under another correction rule presented by said correction rule changing means, and consecutively said amount-of-light correcting means makes correction of the amount of exposure light.