(19)
(11) EP 2 541 332 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
03.01.2018 Bulletin 2018/01

(43) Date of publication A2:
02.01.2013 Bulletin 2013/01

(21) Application number: 12173819.9

(22) Date of filing: 27.06.2012
(51) International Patent Classification (IPC): 
G03G 15/04(2006.01)
 G03G 15/043(2006.01)
(84) Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated Extension States:
BA ME

(30) Priority: 30.06.2011 JP 2011146375

(71) Applicant: Ricoh Company, Ltd.
Tokyo 143-8555 (JP)

(72) Inventors:
  • Yokoyama, Takuhei
    Tokyo, 143-8555 (JP)
  • Kinoshita, Izumi
    Tokyo, 143-8555 (JP)
  • Miyazaki, Susumu
    Tokyo, 143-8555 (JP)
  • Kawanabe, Motohiro
    Tokyo, 143-8555 (JP)
  • Miyadera, Tatsuya
    Tokyo, 143-8555 (JP)
  • Shikama, Takeshi
    Tokyo, 143-8555 (JP)

(74) Representative: Schwabe - Sandmair - Marx 
Patentanwälte Rechtsanwalt Partnerschaft mbB Joseph-Wild-Straße 20
81829 München
81829 München (DE)

   


(54) Image forming apparatus


(57) An image forming apparatus (10) includes an exposing unit (20) including light emitting chips (44) arranged in a main-scanning direction; a developing unit (26) configured to develop an electrostatic latent image formed on a photosensitive element (22) to form a toner image; a transfer unit (28) configured to transfer the toner image to a medium (34); a detecting unit (50) configured to detect an amount of skew in an array direction of each light emitting chip (44); an adjusting unit (68) configured to generate a density correction image to be formed on the medium (34) through dithering, the density correction image having a higher resolution than that of a printing image and having the resolution increased with an increase in the amount of skew; and a correction unit (61) configured to perform skew correction on the density correction image on the basis of the amount of skew.







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