(19)
(11) EP 2 444 850 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
14.06.2017 Bulletin 2017/24

(43) Date of publication A2:
25.04.2012 Bulletin 2012/17

(21) Application number: 11181321.8

(22) Date of filing: 15.09.2011
(51) International Patent Classification (IPC): 
G03G 15/00(2006.01)
 B41J 2/45(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: 15.09.2010 JP 2010207230

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

(72) Inventor:
  • Okada, Tatsuhiko
    Saitama-ken 340-0802 (JP)

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

   


(54) Image forming apparatus and program


(57) An image forming apparatus (G) includes a number-of-overlap-pixels determination unit (300) configured to determine number of the light emitting elements overlapping at ends of two light emitting element array units (2, 3) adjacent to each other in a main scanning direction based on transition of density in a plurality of test pattern images. A plurality of test pattern data are configured to cause the light emitting elements of each of the two light emitting element array units to operate such that a predetermined number of the turned on light emitting elements and the predetermined number of the turned off light emitting elements are alternately and repeatedly arranged, and positions of the turned on light emitting elements and the turned off light emitting elements of one of the two light emitting element array units are sequentially shifted for each of a plurality of test patterns.







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