Printing apparatus with positional offset detection and correcti

Details Printing apparatus with positional offset detection and correcti Printing apparatus with positional offset detection and correcti

1998-05-29

1999-08-31

Pendergrass, Joan

Electrophotography

Image formation

Transfer

347116, G03G 1501, G03G 1516

Patent

active

059465379

ABSTRACT:
A plurality of resist marks of K, C, M and Y color toner components are transferred at predetermined pitches onto a belt for conveying record paper, by means of a plurality of electrostatic recording units. The resist marks are optically detected by sensors. A positional offset detection unit detects positions of resist lines from phases .phi. obtained through Fourier transform of sensor detection signals, and employs as the reference the detected position of the resist mark of K component to thereby detect positional offsets of the detected positions of the resist marks of the other C, M and Y color toner components. A positional offset correction unit corrects the transferred positions of the other C, M and Y color toner components so as to eliminate any positional offsets relative to the K component image.

REFERENCES:
patent: 5287162 (1994-02-01), Jong et al.
patent: 5412577 (1995-05-01), Sainio et al.

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