Image forming apparatus
AssigneeCanon Kabushiki Kaisha
InventorTomonori Sato
Life of this patent
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Abstract
An image forming apparatus includes an image bearing member, a developing member, a controller configured to carry out switching control between a first state in which the developing member is caused to act on the image bearing member and a second state in which the developing member is not caused to act on the image bearing member, a transfer member, and a detector configured to read density information of the recording material. The controller detects a fog density on the basis of a difference in density information between a fog non-occurrence region of a non-image region of the recording material in the second state and a fog occurable region of the non-image region of the recording material in the first state.
Claims9
An image forming apparatus, comprising:
- an image bearing member on which an electrostatic latent image is formed;
- a developing member configured to develop the electrostatic latent image, formed on said image bearing member, into a toner image;
- a transfer member configured to transfer the toner image from said image bearing member onto a recording material;
- and
- a controller configured to carry out switching control between a first state in which said transfer member is caused to act on said image bearing member such that a first non-image region is formed on the recording material and a second state in which said transfer member is not caused to act on said image bearing member such that a second non-image region different from the first non-image region is formed on the recording material;
- and
- a detector configured to detect characteristics of a surface of the recording material carrying the toner image transferred by said transfer member, said detector being configured to detect the characteristics in the first non-image region and the second non-image region,
- wherein said controller is configured to acquire a fog density on the basis of a difference between (i) a first input related to the characteristics detected in the first non-image region by said detector and (ii) a second input related to the characteristics detected in the second non-image region by said detector.
Dependencies are inferred from the claim text.