Konica Minolta, Inc.

Shintaro Sone

Hiroyuki Saito

Tetsuya Ishikawa

Hideaki Tanaka

Kazuteru Ishizuka

Hisayoshi Nagase

Tatsuya Furuta

Kazutoshi Kobayashi

Natsuko Minegishi

Ryoei Ikari

An image forming apparatus includes: an image forming section configured to form a predetermined test image on an image bearing member by a regular development scheme and a first bias development scheme; a concentration detection section configured to detect a concentration of the test image formed by the image forming section; and a causal part determination section configured to determine on a basis of a result of detection by the concentration detection section a causal part of an image defect that is caused when an image is output.

Image forming apparatus and causal part determination method

A charging device has a charging member to charge an object, an applying unit to apply a voltage to the charging member for generating an electric discharge from the charging member, so that the object is discharged by the charging member, a detecting unit to detect an emission of light of the electric discharge, an output unit to output a detection result by the detecting unit, a cleaning unit to clean the charging member, and a controller to control the cleaning unit to clean the charging member when the detection result is out of a predetermined range.

Charging device and image forming apparatus including the same

An image forming apparatus includes: an image forming section including a light exposure section configured to expose an image bearing member to light to form an electrostatic latent image, the image forming section being configured to form a toner image on the image bearing member, and to form an image on a recording sheet by transferring the toner image onto the recording sheet; an estimation section configured to estimate a density lowering position on the basis of image data of an image formed by the image forming section, the density lowering position being a position where decrease in image density relative to a predetermined image density is caused in the image; and a control section configured to increase a light exposure amount at the density lowering position estimated by the estimation section on the image bearing member to an amount greater than a predetermined light exposure amount.

Image forming apparatus and method of forming an image which can prevent a development memory from occurring

Growing community of inventors

Tokyo, Japan

Shintaro Sone