(19)
(11) EP 2 682 820 A3

(12) EUROPEAN PATENT APPLICATION

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

(43) Date of publication A2:
08.01.2014 Bulletin 2014/02

(21) Application number: 13173755.3

(22) Date of filing: 26.06.2013
(51) International Patent Classification (IPC): 
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: 02.07.2012 JP 2012148737

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

(72) Inventors:
  • Kawanabe, Motohiro
    Tokyo, 143-8555 (JP)
  • Miyadera, Tatsuya
    Tokyo, 143-8555 (JP)
  • Hayashi, Masayuki
    Tokyo, 143-8555 (JP)
  • Ikeda, Hiroaki
    Tokyo, 143-8555 (JP)
  • Yamaguchi, Akinori
    Tokyo, 143-8555 (JP)
  • Shirasaki, Yoshinori
    Tokyo, 143-8555 (JP)
  • Ohshima, Tomohiro
    Tokyo, 143-8555 (JP)

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

   


(54) Optical writing controller, image forming apparatus, and optical writing control method


(57) An optical writing controller (120) that forms an electrostatic latent image on a photoconductor (109) by controlling a LEDA (130) includes a resolution controller (123) that acquires information on resolution of the electrostatic latent image and calculates requisite amount of light as exposure intensity per pixel based on requisite exposure intensity per unit area on the photoconductor (109) and the information on resolution, an emission time controller (124) that acquires information on luminous efficiency and calculates a line period emission time in which the LEDA (130) emits light in one line period based on the calculated exposure intensity per pixel and the information on luminous efficiency, and a light emitting controller (122) that controls emitting of the LEDA (130) based on the calculated line period emission time.







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