Patent Number: 8,797,600

Title: Image forming apparatus and gradation correction method with density unevenness detection

Abstract: Image forming apparatus (100) creates a toner pattern on intermediate transfer belt (11) as a preprocessing of gradation correction, and calculates a cycle at which density unevenness is largest. Then, a toner image for gradation correction is formed so as to cancel cyclic unevenness at a cycle at which the largest density unevenness occurs. As a result of this, it becomes possible to suppress the deterioration of density detection accuracy and perform a highly accurate gradation correction even if density unevenness of any cycle occurs.

Inventors: Harashima; Takashi (Sagamihara, JP), Tanaka; Hideaki (Fussa, JP), Hirata; Katsuyuki (Toyokawa, JP), Yamaguchi; Toru (Koganei, JP), Kooriya; Takaaki (Hachioji, JP)

Assignee: Konica Minolta Business Technologies, Inc.

International Classification: H04N 1/40 (20060101)

Expiration Date: 8/05/12018