Alignment error correcting unit for image forming apparatus

Details Alignment error correcting unit for image forming apparatus Alignment error correcting unit for image forming apparatus

2011-04-19

2011-04-19

Chen, Sophia S (Department: 2852)

Electrophotography

Image formation

Transfer

C399S167000

Reexamination Certificate

active

07929891

ABSTRACT:
An image forming apparatus include: a plurality of photosensitive drums; a latent image forming unit for forming an electrostatic latent image on each photosensitive drum; a developing unit for developing each electrostatic latent image; a transferring unit for superimposing and transferring the developed images onto a moving record medium; a measurement unit for measuring positions of the transferred images on the record medium; and a control unit for controlling the photosensitive drums, the latent image forming unit, the developing unit, and the transferring unit. The control unit includes: a calculating unit for calculating a value related to alignment errors in the positions measured by said measurement unit in accordance with a sine-curve fitting method; and a correcting unit for correcting the alignment errors by the calculated value.

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