Color image forming apparatus having misregistration correction

Details Color image forming apparatus having misregistration correction Color image forming apparatus having misregistration correction

1995-09-14

1998-06-16

Beatty, Robert

Electrophotography

Image formation

Transfer

G03G 1501

Patent

active

057686718

ABSTRACT:
An image forming apparatus includes plural latent image forming units for forming latent images on plural image carriers, plural developing units for developing the latent image formed on the image carriers and plural transfer units for transferring the color images developed on the image carriers to an image receiving medium conveyed by a medium support member. This image forming apparatus also includes a first detector for detecting a test pattern. This first detector has a light projecting portion and a light receiving portion which is arranged in parallel with the running direction of the medium support member. The image forming apparatus has a computing unit which computes misregistration of color images developed and transferred onto one of the medium support member and the image receiving medium based on a difference between a detection result by the detector and a threshold value. The misregistration of color images are corrected based on the results of computation by the computing unit. This first detector may be positioned opposite a vibration control roller. Additionally, a second detector detects a variation of a quantity of light reflected from the medium support member and the threshold value is changed accordingly, or the test pattern is prevented from being formed on a contaminated section of the support member.

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patent: 5325154 (1994-06-01), Tayama et al.
patent: 5418556 (1995-05-01), Andrews
patent: 5424809 (1995-06-01), Sawayama et al.
patent: 5452073 (1995-09-01), Kataoka
patent: 5510877 (1996-04-01), DeJong et al.
patent: 5550625 (1996-08-01), Takamatsu et al.

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