Electrophotography – Control of electrophotography process – Of plural processes
Reexamination Certificate
2008-05-27
2008-05-27
Chen, Sophia S (Department: 2852)
Electrophotography
Control of electrophotography process
Of plural processes
C399S046000, C399S050000, C399S051000
Reexamination Certificate
active
07379681
ABSTRACT:
Image forming apparatus in which surface electric potentials of a plurality of surface areas are detected by charging a photoconductor with a different applied bias for each predetermined timing and exposing a plurality of surface areas of the photoconductor by scanning the photoconductor with an optical beam, while changing an exposure intensity of the optical beam for each of the surface areas of the photoconductor. Then, the applied bias necessary for obtaining a predetermined electric potential of a dark section and the exposure intensity of the optical beam necessary for obtaining a predetermined electric potential of a bright section are controlled, on the basis of the surface electric potentials that are detected respectively from the different applied biases and the different exposure intensities. Thereby, the adjustment time can be made shorter than the conventional case.
REFERENCES:
patent: 6208820 (2001-03-01), Nami
patent: 6493524 (2002-12-01), Kamiya
patent: 2001/0046390 (2001-11-01), Kamiya
patent: 2006/0263108 (2006-11-01), Zona
Kondo Shunsaku
Mine Ryuta
Saida Tadaaki
Shibaki Seiji
Canon Kabushiki Kaisha
Canon USA Inc I.P. Div
Chen Sophia S
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