Sharp Kabushiki Kaisha Corporation

Shouji Tomita

Yasutaka Maeda

Katsuhiro Nagayama

Takashi Kitagawa

Daisaku Imaizumi

Makoto Uehara

Kaori Dakeshita

Toshihiro Ohta

A high density detecting toner pattern is formed on a photosensitive body and a high density correction is effected by comparing a value detected by a reflection sensor with a high density reference value so as to maintain an image density at a specific level. An image density correcting section adopts a result of the preceding high density correction as the high density reference value, and compares the same with a result of a current high density correction. The image density correcting section effects the half-tone density correction only when a difference reaches or exceeds a preset difference reference value by forming a half-tone density detecting toner pattern on the photosensitive body and comparing a value detected by the reflection sensor with a half-tone reference value. Consequently, it has become possible to provide an image forming apparatus which can maintain a density output of an entire image at a specific level for any kind of images including solid, line, and half-tone, etc. while shortening a time required for the density correction and reducing a quantity of toner consumed for the density correction.

Image forming apparatus with half-tone density control

Growing community of inventors

Yao, Japan

Shouji Tomita