Image forming apparatus

Details Image forming apparatus Image forming apparatus

2007-06-05

2007-06-05

Chen, Sophia S. (Department: 2852)

Electrophotography

Control of electrophotography process

Of plural processes

C399S015000, C399S072000

Reexamination Certificate

active

11114157

ABSTRACT:
An image forming apparatus having an image forming portion, a sheet conveyance path, an image density detection portion for detecting density of the image formed on the conveyed sheet, and a control portion for performing density adjustment of the image formed on the sheet using detection information. The image forming portion can form a test pattern image on the sheet. The test pattern image has a reference image formed in a predetermined density, and the image forming portion forms the test pattern on the sheet such that the reference image is not formed at positions in the sheet. The positions are located at the same distances away from a front end of the sheet in a conveyance direction as distances between the image density detection portion and points where entry shock of the sheet front-end is generated, in the sheet conveyance path on the downstream side of the image density detection portion.

REFERENCES:
patent: 6961526 (2005-11-01), Tezuka et al.
patent: 7036737 (2006-05-01), Nakayama et al.
patent: 2000-132013 (2000-05-01), None
patent: 2003-287934 (2003-10-01), None

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