Apparatus for forming a color image

Details Apparatus for forming a color image Apparatus for forming a color image

1990-10-31

1993-11-30

Grimley, A. T.

Recorders

Electric recording

Electrochemical

355208, G01D 1506

Patent

active

052669769

ABSTRACT:
A color image recording apparatus comprises edge detection device with image sensors for detecting longitudinal edges of electrostatic recording paper, and mark detection device for detecting registration marks formed at an equal pitch along the edges of the recording paper. Both edges are detected at a first pass thereof through the edge detection device, and the detected output is stored in a memory. During each of second and subsequent passes, detected data is compared with the initially stored data to correct for expansion and shrinkage of the recording paper. Oblique motion of the recording paper is detected from the timing difference between registration marks formed on opposite sides of the recording paper, which timing difference is used to change line recording timing. A single correction is periodically repeated and changed until completion of the correcting for oblique motion of the recording paper as well as expansion or shrinkage thereof, hence ensuring an exact positional coincidence of the individual color images.

REFERENCES:
patent: 4577953 (1986-03-01), Narukawa
patent: 4903067 (1990-02-01), Murayama et al.
patent: 4965597 (1990-10-01), Ohigashi et al.
patent: 4987448 (1991-01-01), Chikama
patent: 5025269 (1991-06-01), Saeki et al.

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