Canon Kabushiki Kaisha

Miyuki Oki

Hiroaki Ogata

Norio Takami

An image forming apparatus, includes an image bearing device for bearing an image to be formed on a transferring material; a charger; an exposing device; a developing device; a transferring device, which transfers a developed image formed on the image bearing device to a transferring material; a current detector, which detects a transferring current flowing through the transferring device; and a controller. A voltage set in the developing device for an image forming area of the image bearing device is different from a voltage set in the developing device for the non-image-forming area of the image bearing device. The controller controls the voltage set in the developing portion, wherein a voltage for the non-image-forming area is controlled based on an output of the current detector.

Image forming apparatus having a transfer current detection device and control for developing bias in non-image area

An image forming apparatus includes an image bearing member and a transferring member for transferring a toner image on the image bearing member onto a recording material in a transferring portion of the image forming apparatus. When the recording material is not present in the transferring portion, a voltage is applied to the transferring member, and on the basis of an electric current then flowing in the transferring member, a voltage applied to the transferring member, when a non-image portion of the image bearing member is in the transferring portion, is controlled.

Image forming apparatus with current-controlled transfer voltage feature

A charging member for charging a member to be charged includes: an electrically conductive member to which a voltage is applicable; and a coating layer that coats the electrically conductive member, in which when a d.c. voltage of &verbar;10&verbar; to &verbar;300&verbar; (V) is applied to the electrically conductive member, the following relationship is satisfied: Z/Ra is 0.7 or less, where Z is the standard deviation of a resistance of the charging member, and Ra is an average value of the resistance of the charging member.

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Shizuoka, Japan

Miyuki Oki